pulsar/spec/app/editor-spec.coffee

Buffer = require 'buffer'
Editor = require 'editor'
Range = require 'range'
Project = require 'project'
$ = require 'jquery'
{$$} = require 'space-pen'
_ = require 'underscore'
fs = require 'fs'

describe "Editor", ->
  buffer = null
  editor = null

  beforeEach ->
    project = new Project(require.resolve('fixtures'))
    buffer = project.open("sample.js")
    editor = new Editor { buffer }

    fakeRootView =
      project: project
      editorFocused: ->
      focus: ->

    editor.rootView = -> fakeRootView
    editor.autoIndent = false
    editor.enableKeymap()
    editor.isFocused = true

  describe "construction", ->
    it "assigns an empty buffer and correctly handles text input (regression coverage)", ->
      editor = new Editor
      expect(editor.buffer.getPath()).toBeUndefined()
      expect(editor.lines.find('.line').length).toBe 1
      editor.insertText('x')
      expect(editor.lines.find('.line').length).toBe 1

  describe ".copy()", ->
    it "builds a new editor with the same edit sessions, cursor position, and scroll position as the receiver", ->
      editor.setCursorScreenPosition([1, 1])

      # prove this test covers serialization and deserialization
      spyOn(editor, 'serialize').andCallThrough()
      spyOn(Editor, 'deserialize').andCallThrough()

      newEditor = editor.copy()
      expect(editor.serialize).toHaveBeenCalled()
      expect(Editor.deserialize).toHaveBeenCalled()
      expect(newEditor.buffer).toBe editor.buffer
      expect(newEditor.getCursorScreenPosition()).toEqual editor.getCursorScreenPosition()

      expect(newEditor.editSessions[0]).toEqual(editor.editSessions[0])
      expect(newEditor.editSessions[0]).not.toBe(editor.editSessions[0])

  describe "editor-open event", ->
    it 'only triggers an editor-open event when it is first added to the DOM', ->
      openHandler = jasmine.createSpy('openHandler')
      editor.on 'editor-open', openHandler

      editor.simulateDomAttachment()
      expect(openHandler).toHaveBeenCalled()
      [event, eventEditor] = openHandler.argsForCall[0]
      expect(eventEditor).toBe editor

      openHandler.reset()
      editor.simulateDomAttachment()
      expect(openHandler).not.toHaveBeenCalled()

  describe "text rendering", ->
    it "creates a line element for each line in the buffer with the html-escaped text of the line", ->
      expect(editor.lines.find('.line').length).toEqual(buffer.numLines())
      expect(buffer.lineForRow(2)).toContain('<')
      expect(editor.lines.find('.line:eq(2)').html()).toContain '&lt;'

      # renders empty lines with a non breaking space
      expect(buffer.lineForRow(10)).toBe ''
      expect(editor.lines.find('.line:eq(10)').html()).toBe '&nbsp;'

    it "syntax highlights code based on the file type", ->
      line1 = editor.lines.find('.line:first')
      expect(line1.find('span:eq(0)')).toMatchSelector '.keyword.definition'
      expect(line1.find('span:eq(0)').text()).toBe 'var'
      expect(line1.find('span:eq(1)')).toMatchSelector '.text'
      expect(line1.find('span:eq(1)').text()).toBe ' '
      expect(line1.find('span:eq(2)')).toMatchSelector '.identifier'
      expect(line1.find('span:eq(2)').text()).toBe 'quicksort'
      expect(line1.find('span:eq(4)')).toMatchSelector '.operator'
      expect(line1.find('span:eq(4)').text()).toBe '='

      line12 = editor.lines.find('.line:eq(11)')
      expect(line12.find('span:eq(1)')).toMatchSelector '.keyword'

    describe "when lines are updated in the buffer", ->
      it "syntax highlights the updated lines", ->
        expect(editor.lines.find('.line:eq(0) span:eq(0)')).toMatchSelector '.keyword.definition'
        buffer.insert([0, 4], "g")
        expect(editor.lines.find('.line:eq(0) span:eq(0)')).toMatchSelector '.keyword.definition'

        # verify that re-highlighting can occur below the changed line
        buffer.insert([5,0], "/* */")
        buffer.insert([1,0], "/*")
        expect(editor.lines.find('.line:eq(2) span:eq(0)')).toMatchSelector '.comment'

    describe "when soft-wrap is enabled", ->
      beforeEach ->
        otherEditor = new Editor
        otherEditor.setBuffer editor.buffer
        otherEditor.attachToDom()
        charWidth = otherEditor.charWidth
        linesPositionLeft = otherEditor.lines.position().left
        otherEditor.remove()
        editor.width(charWidth * 50 + linesPositionLeft)
        editor.setSoftWrap(true)
        editor.attachToDom()

        expect(editor.renderer.maxLineLength).toBe 50

      it "wraps lines that are too long to fit within the editor's width, adjusting cursor positioning accordingly", ->
        expect(editor.lines.find('.line').length).toBe 16
        expect(editor.lines.find('.line:eq(3)').text()).toBe "    var pivot = items.shift(), current, left = [], "
        expect(editor.lines.find('.line:eq(4)').text()).toBe "right = [];"

        editor.setCursorBufferPosition([3, 51])
        expect(editor.find('.cursor').offset()).toEqual(editor.lines.find('.line:eq(4)').offset())

        editor.setCursorBufferPosition([4, 0])
        expect(editor.find('.cursor').offset()).toEqual(editor.lines.find('.line:eq(5)').offset())

        editor.getSelection().setBufferRange(new Range([6, 30], [6, 55]))
        [region1, region2] = editor.getSelection().regions
        expect(region1.offset().top).toBe(editor.lines.find('.line:eq(7)').offset().top)
        expect(region2.offset().top).toBe(editor.lines.find('.line:eq(8)').offset().top)

      it "handles changes to wrapped lines correctly", ->
        buffer.insert([6, 28], '1234567')
        expect(editor.lines.find('.line:eq(7)').text()).toBe '      current < pivot ? left1234567.push(current) '
        expect(editor.lines.find('.line:eq(8)').text()).toBe ': right.push(current);'
        expect(editor.lines.find('.line:eq(9)').text()).toBe '    }'

      it "changes the max line length and repositions the cursor when the window size changes", ->
        editor.setCursorBufferPosition([3, 60])
        setEditorWidthInChars(editor, 40)
        $(window).trigger 'resize'
        expect(editor.lines.find('.line').length).toBe 19
        expect(editor.lines.find('.line:eq(4)').text()).toBe "left = [], right = [];"
        expect(editor.lines.find('.line:eq(5)').text()).toBe "    while(items.length > 0) {"
        expect(editor.bufferPositionForScreenPosition(editor.getCursorScreenPosition())).toEqual [3, 60]

      it "wraps the lines of any newly assigned buffers", ->
        otherBuffer = new Buffer
        otherBuffer.setText([1..100].join(''))
        editor.setBuffer(otherBuffer)
        expect(editor.lines.find('.line').length).toBeGreaterThan(1)

      it "unwraps lines and cancels window resize listener when softwrap is disabled", ->
        editor.toggleSoftWrap()
        expect(editor.lines.find('.line:eq(3)').text()).toBe '    var pivot = items.shift(), current, left = [], right = [];'

        spyOn(editor, 'setMaxLineLength')
        $(window).trigger 'resize'
        expect(editor.setMaxLineLength).not.toHaveBeenCalled()

      it "allows the cursor to move down to the last line", ->
        _.times editor.getLastScreenRow(), -> editor.moveCursorDown()
        expect(editor.getCursorScreenPosition()).toEqual [editor.getLastScreenRow(), 0]
        editor.moveCursorDown()
        expect(editor.getCursorScreenPosition()).toEqual [editor.getLastScreenRow(), 2]

      it "allows the cursor to move up to a shorter soft wrapped line", ->
        editor.setCursorScreenPosition([11, 15])
        editor.moveCursorUp()
        expect(editor.getCursorScreenPosition()).toEqual [10, 10]
        editor.moveCursorUp()
        editor.moveCursorUp()
        expect(editor.getCursorScreenPosition()).toEqual [8, 15]

      it "it allows the cursor to wrap when moving horizontally past the beginning / end of a wrapped line", ->
        editor.setCursorScreenPosition([11, 0])
        editor.moveCursorLeft()
        expect(editor.getCursorScreenPosition()).toEqual [10, 10]

        editor.moveCursorRight()
        expect(editor.getCursorScreenPosition()).toEqual [11, 0]

  describe "gutter rendering", ->
    it "creates a line number element for each line in the buffer", ->
      expect(editor.gutter.find('.line-number').length).toEqual(buffer.numLines())
      expect(editor.gutter.find('.line-number:first').text()).toBe "1"
      expect(editor.gutter.find('.line-number:last').text()).toBe "13"

    it "updates line numbers when lines are inserted or removed", ->
      expect(editor.gutter.find('.line-number').length).toEqual 13

      buffer.insert([0, 0], "a new line\n")
      expect(editor.gutter.find('.line-number').length).toEqual 14
      expect(editor.gutter.find('.line-number:last').text()).toBe "14"

      buffer.deleteRow(0)
      buffer.deleteRow(0)
      expect(editor.gutter.find('.line-number').length).toEqual 12
      expect(editor.gutter.find('.line-number:last').text()).toBe "12"

    describe "when wrapping is on", ->
      it "renders a • instead of line number for wrapped portions of lines", ->
        editor.setMaxLineLength(50)
        expect(editor.gutter.find('.line-number:eq(3)').text()).toBe '4'
        expect(editor.gutter.find('.line-number:eq(4)').text()).toBe '•'
        expect(editor.gutter.find('.line-number:eq(5)').text()).toBe '5'

        expect(editor.gutter.find('.line-number:eq(7)').text()).toBe '7'
        expect(editor.gutter.find('.line-number:eq(8)').text()).toBe '•'
        expect(editor.gutter.find('.line-number:eq(9)').text()).toBe '8'

    describe "when there are folds", ->
      it "skips line numbers", ->
        editor.createFold([[3, 10], [5, 1]])
        expect(editor.gutter.find('.line-number:eq(3)').text()).toBe '4'
        expect(editor.gutter.find('.line-number:eq(4)').text()).toBe '7'

    describe "when there is a fold on the last screen line of a wrapped line", ->
      it "renders line numbers correctly when the fold is destroyed (regression)", ->
        editor.setMaxLineLength(50)
        fold = editor.createFold([[3, 52], [3, 56]])
        fold.destroy()
        expect(editor.gutter.find('.line-number:last').text()).toBe '13'

    it "adds a drop shadow when the horizontal scroller is scrolled to the right", ->
      editor.attachToDom()
      editor.width(100)

      expect(editor.gutter).not.toHaveClass('drop-shadow')

      editor.scroller.scrollLeft(10)
      editor.scroller.trigger('scroll')

      expect(editor.gutter).toHaveClass('drop-shadow')

      editor.scroller.scrollLeft(0)
      editor.scroller.trigger('scroll')

      expect(editor.gutter).not.toHaveClass('drop-shadow')

    it "scrolls the buffer to match the scroll top of the scroller, which contains the lines", ->
      editor.attachToDom()
      editor.height(200)

      editor.scroller.scrollTop(50)
      editor.scroller.trigger('scroll')
      expect(editor.gutter.scrollTop()).toBe 50

      editor.scroller.scrollTop(20)
      editor.scroller.trigger('scroll')
      expect(editor.gutter.scrollTop()).toBe 20

  describe "cursor movement", ->
    describe "when the arrow keys are pressed", ->
      it "moves the cursor by a single row/column", ->
        editor.trigger keydownEvent('right')
        expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 1)

        editor.trigger keydownEvent('down')
        expect(editor.getCursorScreenPosition()).toEqual(row: 1, column: 1)

        editor.trigger keydownEvent('left')
        expect(editor.getCursorScreenPosition()).toEqual(row: 1, column: 0)

        editor.trigger keydownEvent('up')
        expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)

      describe "vertical movement", ->
        describe "goal column retention", ->
          lineLengths = null

          beforeEach ->
            lineLengths = buffer.getLines().map (line) -> line.length
            expect(lineLengths[3]).toBeGreaterThan(lineLengths[4])
            expect(lineLengths[5]).toBeGreaterThan(lineLengths[4])
            expect(lineLengths[6]).toBeGreaterThan(lineLengths[3])

          it "retains the goal column when moving up", ->
            expect(lineLengths[6]).toBeGreaterThan(32)
            editor.setCursorScreenPosition(row: 6, column: 32)

            editor.moveCursorUp()
            expect(editor.getCursorScreenPosition().column).toBe lineLengths[5]

            editor.moveCursorUp()
            expect(editor.getCursorScreenPosition().column).toBe lineLengths[4]

            editor.moveCursorUp()
            expect(editor.getCursorScreenPosition().column).toBe 32

          it "retains the goal column when moving down", ->
            editor.setCursorScreenPosition(row: 3, column: lineLengths[3])

            editor.moveCursorDown()
            expect(editor.getCursorScreenPosition().column).toBe lineLengths[4]

            editor.moveCursorDown()
            expect(editor.getCursorScreenPosition().column).toBe lineLengths[5]

            editor.moveCursorDown()
            expect(editor.getCursorScreenPosition().column).toBe lineLengths[3]

          it "clears the goal column when the cursor is set", ->
            # set a goal column by moving down
            editor.setCursorScreenPosition(row: 3, column: lineLengths[3])
            editor.moveCursorDown()
            expect(editor.getCursorScreenPosition().column).not.toBe 6

            # clear the goal column by explicitly setting the cursor position
            editor.setCursorScreenPosition([4,6])
            expect(editor.getCursorScreenPosition().column).toBe 6

            editor.moveCursorDown()
            expect(editor.getCursorScreenPosition().column).toBe 6

        describe "when up is pressed on the first line", ->
          it "moves the cursor to the beginning of the line, but retains the goal column", ->
            editor.setCursorScreenPosition(row: 0, column: 4)
            editor.moveCursorUp()
            expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)

            editor.moveCursorDown()
            expect(editor.getCursorScreenPosition()).toEqual(row: 1, column: 4)

        describe "when down is pressed on the last line", ->
          it "moves the cursor to the end of line, but retains the goal column", ->
            lastLineIndex = buffer.getLines().length - 1
            lastLine = buffer.lineForRow(lastLineIndex)
            expect(lastLine.length).toBeGreaterThan(0)

            editor.setCursorScreenPosition(row: lastLineIndex, column: 1)
            editor.moveCursorDown()
            expect(editor.getCursorScreenPosition()).toEqual(row: lastLineIndex, column: lastLine.length)

            editor.moveCursorUp()
            expect(editor.getCursorScreenPosition().column).toBe 1

          it "retains a goal column of 0", ->
            lastLineIndex = buffer.getLines().length - 1
            lastLine = buffer.lineForRow(lastLineIndex)
            expect(lastLine.length).toBeGreaterThan(0)

            editor.setCursorScreenPosition(row: lastLineIndex, column: 0)
            editor.moveCursorDown()
            editor.moveCursorUp()
            expect(editor.getCursorScreenPosition().column).toBe 0

      describe "horizontal movement", ->
        describe "when left is pressed on the first column", ->
          describe "when there is a previous line", ->
            it "wraps to the end of the previous line", ->
              editor.setCursorScreenPosition(row: 1, column: 0)
              editor.moveCursorLeft()
              expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: buffer.lineForRow(0).length)

          describe "when the cursor is on the first line", ->
            it "remains in the same position (0,0)", ->
              editor.setCursorScreenPosition(row: 0, column: 0)
              editor.moveCursorLeft()
              expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)

        describe "when right is pressed on the last column", ->
          describe "when there is a subsequent line", ->
            it "wraps to the beginning of the next line", ->
              editor.setCursorScreenPosition(row: 0, column: buffer.lineForRow(0).length)
              editor.moveCursorRight()
              expect(editor.getCursorScreenPosition()).toEqual(row: 1, column: 0)

          describe "when the cursor is on the last line", ->
            it "remains in the same position", ->
              lastLineIndex = buffer.getLines().length - 1
              lastLine = buffer.lineForRow(lastLineIndex)
              expect(lastLine.length).toBeGreaterThan(0)

              lastPosition = { row: lastLineIndex, column: lastLine.length }
              editor.setCursorScreenPosition(lastPosition)
              editor.moveCursorRight()

              expect(editor.getCursorScreenPosition()).toEqual(lastPosition)

    describe "move-to-top ", ->
      it "moves cusor to the top of the buffer", ->
        editor.setCursorScreenPosition [11,1]
        editor.addCursorAtScreenPosition [12,0]
        editor.trigger 'move-to-top'
        expect(editor.getCursors().length).toBe 1
        expect(editor.getCursorBufferPosition()).toEqual [0,0]

    describe "move-to-bottom", ->
      it "moves cusor to the bottom of the buffer", ->
        editor.setCursorScreenPosition [0,0]
        editor.addCursorAtScreenPosition [1,0]
        editor.trigger 'move-to-bottom'
        expect(editor.getCursors().length).toBe 1
        expect(editor.getCursorBufferPosition()).toEqual [12,2]

    describe "move-to-beginning-of-line", ->
      it "moves cursor to the beginning of line", ->
        editor.setCursorScreenPosition [0,5]
        editor.addCursorAtScreenPosition [1,7]
        editor.trigger 'move-to-beginning-of-line'
        expect(editor.getCursors().length).toBe 2
        [cursor1, cursor2] = editor.getCursors()
        expect(cursor1.getBufferPosition()).toEqual [0,0]
        expect(cursor2.getBufferPosition()).toEqual [1,0]

    describe "move-to-end-of-line", ->
      it "moves cursor to the end of line", ->
        editor.setCursorScreenPosition [0,0]
        editor.addCursorAtScreenPosition [1,0]
        editor.trigger 'move-to-end-of-line'
        expect(editor.getCursors().length).toBe 2
        [cursor1, cursor2] = editor.getCursors()
        expect(cursor1.getBufferPosition()).toEqual [0,29]
        expect(cursor2.getBufferPosition()).toEqual [1,30]

    describe "move-to-first-character-of-line", ->
      it "moves to the first character of the current line or the beginning of the line if it's already on the first character", ->
        editor.setCursorScreenPosition [0,5]
        editor.addCursorAtScreenPosition [1,7]
        editor.trigger 'move-to-first-character-of-line'
        [cursor1, cursor2] = editor.getCursors()
        expect(cursor1.getBufferPosition()).toEqual [0,0]
        expect(cursor2.getBufferPosition()).toEqual [1,2]
        editor.trigger 'move-to-first-character-of-line'
        expect(cursor1.getBufferPosition()).toEqual [0,0]
        expect(cursor2.getBufferPosition()).toEqual [1,0]

    describe "move-to-next-word", ->
      it "moves the cursor to the next word or the end of file if there is no next word", ->
        editor.setCursorBufferPosition [2, 5]
        editor.addCursorAtBufferPosition [3, 60]
        [cursor1, cursor2] = editor.getCursors()

        editor.trigger 'move-to-next-word'

        expect(cursor1.getBufferPosition()).toEqual [2, 7]
        expect(cursor2.getBufferPosition()).toEqual [4, 4]

        buffer.insert([12, 2], '   ')
        cursor1.setBufferPosition([12, 1])
        editor.trigger 'move-to-next-word'
        expect(cursor1.getBufferPosition()).toEqual [12, 5]

    describe "move-to-beginning-of-word", ->
      it "moves the cursor to the beginning of the word", ->
        editor.setCursorBufferPosition [0, 8]
        editor.addCursorAtBufferPosition [1, 12]
        editor.addCursorAtBufferPosition [3, 0]
        [cursor1, cursor2, cursor3] = editor.getCursors()

        editor.trigger 'move-to-beginning-of-word'

        expect(cursor1.getBufferPosition()).toEqual [0, 4]
        expect(cursor2.getBufferPosition()).toEqual [1, 11]
        expect(cursor3.getBufferPosition()).toEqual [2, 39]

      it "does not fail at position [0, 0]", ->
        editor.setCursorBufferPosition([0, 0])
        editor.trigger 'move-to-beginning-of-word'

    describe "move-to-end-of-word", ->
      it "moves the cursor to the end of the word", ->
        editor.setCursorBufferPosition [0, 6]
        editor.addCursorAtBufferPosition [1, 10]
        editor.addCursorAtBufferPosition [2, 40]
        [cursor1, cursor2, cursor3] = editor.getCursors()

        editor.trigger 'move-to-end-of-word'

        expect(cursor1.getBufferPosition()).toEqual [0, 13]
        expect(cursor2.getBufferPosition()).toEqual [1, 12]
        expect(cursor3.getBufferPosition()).toEqual [3, 7]

    describe ".setCursorScreenPosition({row, column})", ->
      beforeEach ->
        editor.attachToDom()
        editor.setCursorScreenPosition(row: 2, column: 2)

      it "moves the cursor to the character at the given row and column", ->
        expect(editor.find('.cursor').position()).toEqual(top: 2 * editor.lineHeight, left: 2 * editor.charWidth)

      describe "if soft-wrap is enabled", ->
        beforeEach ->
          setEditorWidthInChars(editor, 20)
          editor.setSoftWrap(true)

    describe "when a mousedown event occurs in the editor", ->
      beforeEach ->
        editor.attachToDom()
        editor.css(position: 'absolute', top: 10, left: 10)

      describe "when soft-wrap and is enabled and code is folded", ->
        beforeEach ->
          setEditorWidthInChars(editor, 50)
          editor.setSoftWrap(true)
          editor.createFold(new Range([3, 3], [3, 7]))

        describe "when it is a single click", ->
          it "re-positions the cursor from the clicked screen position to the corresponding buffer position", ->
            expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)
            editor.lines.trigger mousedownEvent(editor: editor, point: [4, 7])
            expect(editor.getCursorBufferPosition()).toEqual(row: 3, column: 58)

        describe "when it is a double click", ->
          it "selects the word under the cursor", ->
            expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)
            editor.lines.trigger mousedownEvent(editor: editor, point: [4, 3], originalEvent: {detail: 1})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [4, 3], originalEvent: {detail: 2})
            expect(editor.getSelectedText()).toBe "right"

        describe "when it is clicked more then twice (triple, quadruple, etc...)", ->
          it "selects the line under the cursor", ->
            expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)

            # Triple click
            editor.lines.trigger mousedownEvent(editor: editor, point: [4, 3], originalEvent: {detail: 1})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [4, 3], originalEvent: {detail: 2})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [4, 3], originalEvent: {detail: 3})
            editor.lines.trigger 'mouseup'
            expect(editor.getSelectedText()).toBe "    var pivot = items.shift(), current, left = [], right = [];"

            # Quad click
            editor.lines.trigger mousedownEvent(editor: editor, point: [8, 3], originalEvent: {detail: 1})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [8, 3], originalEvent: {detail: 2})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [8, 3], originalEvent: {detail: 3})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [8, 3], originalEvent: {detail: 4})
            editor.lines.trigger 'mouseup'

            expect(editor.getSelectedText()).toBe "      current < pivot ? left.push(current) : right.push(current);"

      describe "when soft-wrap is disabled", ->
        describe "when it is a single click", ->
          it "re-positions the cursor to the clicked row / column", ->
            expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)

            editor.lines.trigger mousedownEvent(editor: editor, point: [3, 10])
            expect(editor.getCursorScreenPosition()).toEqual(row: 3, column: 10)

          describe "when the lines are scrolled to the right", ->
            it "re-positions the cursor on the clicked location", ->
              setEditorWidthInChars(editor, 30)
              expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)
              editor.lines.trigger mousedownEvent(editor: editor, point: [3, 30]) # scrolls lines to the right
              editor.lines.trigger mousedownEvent(editor: editor, point: [3, 50])
              expect(editor.getCursorBufferPosition()).toEqual(row: 3, column: 50)

        describe "when it is a double click", ->
          it "selects the word under the cursor", ->
            expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)
            editor.lines.trigger mousedownEvent(editor: editor, point: [0, 8], originalEvent: {detail: 1})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [0, 8], originalEvent: {detail: 2})
            editor.lines.trigger 'mouseup'
            expect(editor.getSelectedText()).toBe "quicksort"

        describe "when it is clicked more then twice (triple, quadruple, etc...)", ->
          it "selects the line under the cursor", ->
            expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)

            # Triple click
            editor.lines.trigger mousedownEvent(editor: editor, point: [1, 8], originalEvent: {detail: 1})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [1, 8], originalEvent: {detail: 2})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [1, 8], originalEvent: {detail: 3})
            editor.lines.trigger 'mouseup'
            expect(editor.getSelectedText()).toBe "  var sort = function(items) {"

            # Quad click
            editor.lines.trigger mousedownEvent(editor: editor, point: [2, 3], originalEvent: {detail: 1})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [2, 3], originalEvent: {detail: 2})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [2, 3], originalEvent: {detail: 3})
            editor.lines.trigger 'mouseup'
            editor.lines.trigger mousedownEvent(editor: editor, point: [2, 3], originalEvent: {detail: 4})
            editor.lines.trigger 'mouseup'
            expect(editor.getSelectedText()).toBe "    if (items.length <= 1) return items;"

    describe "scrolling", ->
      describe "vertical scrolling", ->
        beforeEach ->
          editor.attachToDom()
          editor.focus()
          editor.vScrollMargin = 3

        it "scrolls the buffer with the specified scroll margin when cursor approaches the end of the screen", ->
          editor.height(editor.lineHeight * 10)

          _.times 6, -> editor.moveCursorDown()
          window.advanceClock()
          expect(editor.scroller.scrollTop()).toBe(0)

          editor.moveCursorDown()
          window.advanceClock()
          expect(editor.scroller.scrollTop()).toBe(editor.lineHeight)

          editor.moveCursorDown()
          window.advanceClock()
          expect(editor.scroller.scrollTop()).toBe(editor.lineHeight * 2)

          _.times 3, -> editor.moveCursorUp()
          window.advanceClock()
          expect(editor.scroller.scrollTop()).toBe(editor.lineHeight * 2)

          editor.moveCursorUp()
          window.advanceClock()
          expect(editor.scroller.scrollTop()).toBe(editor.lineHeight)

          editor.moveCursorUp()
          window.advanceClock()
          expect(editor.scroller.scrollTop()).toBe(0)

        it "reduces scroll margins when there isn't enough height to maintain them and scroll smoothly", ->
          setEditorHeightInLines(editor, 5)

          _.times 3, ->
            editor.moveCursorDown()
            window.advanceClock()

          expect(editor.scroller.scrollTop()).toBe(editor.lineHeight)

          editor.moveCursorUp()
          window.advanceClock()
          expect(editor.scroller.scrollTop()).toBe(0)

      describe "horizontal scrolling", ->
        charWidth = null
        beforeEach ->
          editor.attachToDom()
          {charWidth} = editor
          editor.hScrollMargin = 5

        it "scrolls horizontally to keep the cursor on screen", ->
          setEditorWidthInChars(editor, 30)

          # moving right
          editor.setCursorScreenPosition([2, 24])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe 0

          editor.setCursorScreenPosition([2, 25])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe charWidth

          editor.setCursorScreenPosition([2, 28])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe charWidth * 4

          # moving left
          editor.setCursorScreenPosition([2, 9])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe charWidth * 4

          editor.setCursorScreenPosition([2, 8])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe charWidth * 3

          editor.setCursorScreenPosition([2, 5])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe 0

        it "reduces scroll margins when there isn't enough width to maintain them and scroll smoothly", ->
          editor.hScrollMargin = 6
          setEditorWidthInChars(editor, 7)

          editor.setCursorScreenPosition([2, 3])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe(0)

          editor.setCursorScreenPosition([2, 4])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe(charWidth)

          editor.setCursorScreenPosition([2, 3])
          window.advanceClock()
          expect(editor.scroller.scrollLeft()).toBe(0)

        describe "when soft-wrap is on", ->
          beforeEach ->
            editor.setSoftWrap(true)

          it "does not scroll the buffer horizontally", ->
            editor.width(charWidth * 30)

            # moving right
            editor.setCursorScreenPosition([2, 24])
            expect(editor.scroller.scrollLeft()).toBe 0

            editor.setCursorScreenPosition([2, 25])
            expect(editor.scroller.scrollLeft()).toBe 0

            editor.setCursorScreenPosition([2, 28])
            expect(editor.scroller.scrollLeft()).toBe 0

            # moving left
            editor.setCursorScreenPosition([2, 9])
            expect(editor.scroller.scrollLeft()).toBe 0

            editor.setCursorScreenPosition([2, 8])
            expect(editor.scroller.scrollLeft()).toBe 0

            editor.setCursorScreenPosition([2, 5])
            expect(editor.scroller.scrollLeft()).toBe 0

      describe "when there are multiple cursor", ->
        beforeEach ->
          editor.attachToDom()
          editor.focus()
          editor.vScrollMargin = 2

        it "only attempts to scroll when a cursor is visible", ->
          setEditorWidthInChars(editor, 20)
          setEditorHeightInLines(editor, 10)
          editor.setCursorBufferPosition([11,0])
          editor.addCursorAtBufferPosition([6,50])
          editor.addCursorAtBufferPosition([0,0])
          window.advanceClock()

          scrollHandler = spyOn(editor, 'scrollVertically')

          editor.moveCursorRight()
          window.advanceClock()
          position = editor.pixelPositionForScreenPosition([0,1])
          expect(scrollHandler).toHaveBeenCalledWith(position)

        it "only attempts to scroll once when multiple cursors are visible", ->
          setEditorWidthInChars(editor, 20)
          setEditorHeightInLines(editor, 10)
          editor.setCursorBufferPosition([11,0])
          editor.addCursorAtBufferPosition([0,0])
          editor.addCursorAtBufferPosition([6,0])
          window.advanceClock()

          scrollHandler = spyOn(editor, 'scrollVertically')

          editor.moveCursorRight()
          window.advanceClock()

          position = editor.pixelPositionForScreenPosition([6,1])
          expect(scrollHandler).toHaveBeenCalledWith(position)

  describe "auto indent/outdent", ->
    beforeEach ->
      editor.autoIndent = true

    describe "when editing a line that spans a single screen line", ->
      describe "when a newline is inserted", ->
        it "indents cursor based on the indentation of previous buffer line", ->
          editor.setCursorBufferPosition([1, 30])
          editor.insertText("\n")
          expect(editor.buffer.lineForRow(2)).toEqual("    ")

      describe "when a newline is inserted following a fold placeholder", ->
        it "indents cursor based on the indentation of previous buffer line", ->
          editor.createFold([[1, 10], [1, 30]])
          editor.setCursorBufferPosition([1, 30])
          editor.insertText("\n")
          expect(editor.buffer.lineForRow(2)).toEqual("    ")

      describe "when text beginning with a newline is inserted", ->
        it "indents cursor based on the indentation of previous buffer line", ->
          editor.setCursorBufferPosition([4, 29])
          editor.insertText("\nvar thisIsCool")
          expect(editor.buffer.lineForRow(5)).toEqual("      var thisIsCool")

      describe "when text that closes a scope entered", ->
        it "outdents the text", ->
          editor.setCursorBufferPosition([1, 30])
          editor.insertText("\n")
          expect(editor.buffer.lineForRow(2)).toEqual("    ")
          editor.insertText("}")
          expect(editor.buffer.lineForRow(2)).toEqual("  }")
          expect(editor.getCursorBufferPosition().column).toBe 3

      describe "when newlines are inserted for multiple cursors", ->
        it "auto-indents the newline for each cursor", ->
          editor.setCursorScreenPosition([1, 30])
          editor.addCursorAtScreenPosition([4, 29])
          editor.insertText("\n")
          expect(editor.buffer.lineForRow(2)).toEqual("    ")
          expect(editor.buffer.lineForRow(6)).toEqual("      ")

    describe "when editing a line that spans multiple screen lines", ->
      beforeEach ->
        editor.setSoftWrap(true, 50)

      describe "when newline is inserted", ->
        it "indents cursor based on the indentation of previous buffer line", ->
          editor.setCursorBufferPosition([4, 29])
          editor.insertText("\n")
          expect(editor.buffer.lineForRow(5)).toEqual("      ")

      describe "when text that closes a scope entered", ->
        it "outdents the text", ->
          editor.setCursorBufferPosition([4, 29])
          editor.insertText("\n")
          expect(editor.buffer.lineForRow(5)).toEqual("      ")
          editor.insertText("}")
          expect(editor.buffer.lineForRow(5)).toEqual("    }")
          expect(editor.getCursorBufferPosition().column).toBe 5

  describe "selection", ->
    selection = null

    beforeEach ->
      selection = editor.getSelection()

    describe "when the arrow keys are pressed with the shift modifier", ->
      it "expands the selection up to the cursor's new location", ->
        editor.setCursorScreenPosition(row: 1, column: 6)

        expect(selection.isEmpty()).toBeTruthy()

        editor.trigger keydownEvent('right', shiftKey: true)

        expect(selection.isEmpty()).toBeFalsy()
        range = selection.getScreenRange()
        expect(range.start).toEqual(row: 1, column: 6)
        expect(range.end).toEqual(row: 1, column: 7)

        editor.trigger keydownEvent('right', shiftKey: true)
        range = selection.getScreenRange()
        expect(range.start).toEqual(row: 1, column: 6)
        expect(range.end).toEqual(row: 1, column: 8)

        editor.trigger keydownEvent('down', shiftKey: true)
        range = selection.getScreenRange()
        expect(range.start).toEqual(row: 1, column: 6)
        expect(range.end).toEqual(row: 2, column: 8)

        editor.trigger keydownEvent('left', shiftKey: true)
        range = selection.getScreenRange()
        expect(range.start).toEqual(row: 1, column: 6)
        expect(range.end).toEqual(row: 2, column: 7)

        editor.trigger keydownEvent('up', shiftKey: true)
        range = selection.getScreenRange()
        expect(range.start).toEqual(row: 1, column: 6)
        expect(range.end).toEqual(row: 1, column: 7)

    describe "when the arrow keys are pressed without the shift modifier", ->
      makeNonEmpty = ->
        selection.setBufferRange(new Range({row: 1, column: 2}, {row: 1, column: 5}))
        expect(selection.isEmpty()).toBeFalsy()

      it "clears the selection", ->
        makeNonEmpty()
        editor.trigger keydownEvent('right')
        expect(selection.isEmpty()).toBeTruthy()

        makeNonEmpty()
        editor.trigger keydownEvent('left')
        expect(selection.isEmpty()).toBeTruthy()

        makeNonEmpty()
        editor.trigger keydownEvent('up')
        expect(selection.isEmpty()).toBeTruthy()

        makeNonEmpty()
        editor.trigger keydownEvent('down')
        expect(selection.isEmpty()).toBeTruthy()

    describe "when the mouse is dragged across the text", ->
      it "creates a selection from the initial click to mouse cursor's location ", ->
        editor.attachToDom()
        editor.css(position: 'absolute', top: 10, left: 10)

        # start
        editor.lines.trigger mousedownEvent(editor: editor, point: [4, 10])

        # moving changes selection
        editor.lines.trigger mousemoveEvent(editor: editor, point: [5, 27])

        range = editor.getSelection().getScreenRange()
        expect(range.start).toEqual({row: 4, column: 10})
        expect(range.end).toEqual({row: 5, column: 27})
        expect(editor.getCursorScreenPosition()).toEqual(row: 5, column: 27)

        # mouse up may occur outside of editor, but still need to halt selection
        $(document).trigger 'mouseup'

        # moving after mouse up should not change selection
        editor.lines.trigger mousemoveEvent(editor: editor, point: [8, 8])

        range = editor.getSelection().getScreenRange()
        expect(range.start).toEqual({row: 4, column: 10})
        expect(range.end).toEqual({row: 5, column: 27})
        expect(editor.getCursorScreenPosition()).toEqual(row: 5, column: 27)

      it "creates a selection from the word underneath an initial double click to mouse's new location ", ->
        editor.attachToDom()
        editor.css(position: 'absolute', top: 10, left: 10)

        # double click
        editor.lines.trigger mousedownEvent(editor: editor, point: [4, 7], originalEvent: {detail: 1})
        $(document).trigger 'mouseup'
        editor.lines.trigger mousedownEvent(editor: editor, point: [4, 7], originalEvent: {detail: 2})

        # moving changes selection
        editor.lines.trigger mousemoveEvent(editor: editor, point: [5, 27])

        range = editor.getSelection().getScreenRange()
        expect(range.start).toEqual({row: 4, column: 4})
        expect(range.end).toEqual({row: 5, column: 27})
        expect(editor.getCursorScreenPosition()).toEqual(row: 5, column: 27)

        # mouse up may occur outside of editor, but still need to halt selection
        $(document).trigger 'mouseup'

        # moving after mouse up should not change selection
        editor.lines.trigger mousemoveEvent(editor: editor, point: [8, 8])

        range = editor.getSelection().getScreenRange()
        expect(range.start).toEqual({row: 4, column: 4})
        expect(range.end).toEqual({row: 5, column: 27})
        expect(editor.getCursorScreenPosition()).toEqual(row: 5, column: 27)

      it "creates a selection from the line underneath an initial triple click to mouse's new location ", ->
        editor.attachToDom()
        editor.css(position: 'absolute', top: 10, left: 10)

        # double click
        editor.lines.trigger mousedownEvent(editor: editor, point: [4, 7], originalEvent: {detail: 1})
        $(document).trigger 'mouseup'
        editor.lines.trigger mousedownEvent(editor: editor, point: [4, 7], originalEvent: {detail: 2})
        $(document).trigger 'mouseup'
        editor.lines.trigger mousedownEvent(editor: editor, point: [4, 7], originalEvent: {detail: 3})

        # moving changes selection
        editor.lines.trigger mousemoveEvent(editor: editor, point: [5, 27])

        range = editor.getSelection().getScreenRange()
        expect(range.start).toEqual({row: 4, column: 0})
        expect(range.end).toEqual({row: 5, column: 27})
        expect(editor.getCursorScreenPosition()).toEqual(row: 5, column: 27)

        # mouse up may occur outside of editor, but still need to halt selection
        $(document).trigger 'mouseup'

        # moving after mouse up should not change selection
        editor.lines.trigger mousemoveEvent(editor: editor, point: [8, 8])

        range = editor.getSelection().getScreenRange()
        expect(range.start).toEqual({row: 4, column: 0})
        expect(range.end).toEqual({row: 5, column: 27})
        expect(editor.getCursorScreenPosition()).toEqual(row: 5, column: 27)

    describe "shift-click", ->
      beforeEach ->
        editor.attachToDom()
        editor.css(position: 'absolute', top: 10, left: 10)
        editor.setCursorScreenPosition([4, 7])

      it "selects from the cursor's current location to the clicked location", ->
        editor.lines.trigger mousedownEvent(editor: editor, point: [5, 24], shiftKey: true)
        expect(editor.getSelection().getScreenRange()).toEqual [[4, 7], [5, 24]]

      describe "when it is a double-click", ->
        it "expands the selection to include the double-clicked word", ->
          editor.lines.trigger mousedownEvent(editor: editor, point: [5, 24], shiftKey: true, originalEvent: { detail: 1 })
          editor.lines.trigger mousedownEvent(editor: editor, point: [5, 24], shiftKey: true, originalEvent: { detail: 2 })
          expect(editor.getSelection().getScreenRange()).toEqual [[4, 7], [5, 27]]

      describe "when it is a triple-click", ->
        it "expands the selection to include the triple-clicked line", ->
          editor.lines.trigger mousedownEvent(editor: editor, point: [5, 24], shiftKey: true, originalEvent: { detail: 1 })
          editor.lines.trigger mousedownEvent(editor: editor, point: [5, 24], shiftKey: true, originalEvent: { detail: 2 })
          editor.lines.trigger mousedownEvent(editor: editor, point: [5, 24], shiftKey: true, originalEvent: { detail: 3 })
          expect(editor.getSelection().getScreenRange()).toEqual [[4, 7], [5, 30]]

    describe "select-to-top", ->
      it "selects text from cusor position to the top of the buffer", ->
        editor.setCursorScreenPosition [11,2]
        editor.addCursorAtScreenPosition [10,0]
        editor.trigger 'select-to-top'
        expect(editor.getCursors().length).toBe 1
        expect(editor.getCursorBufferPosition()).toEqual [0,0]
        expect(editor.getSelection().getBufferRange()).toEqual [[0,0], [11,2]]
        expect(editor.getSelection().isReversed()).toBeTruthy()

    describe "select-to-bottom", ->
      it "selects text from cusor position to the bottom of the buffer", ->
        editor.setCursorScreenPosition [10,0]
        editor.addCursorAtScreenPosition [9,3]
        editor.trigger 'select-to-bottom'
        expect(editor.getCursors().length).toBe 1
        expect(editor.getCursorBufferPosition()).toEqual [12,2]
        expect(editor.getSelection().getBufferRange()).toEqual [[9,3], [12,2]]
        expect(editor.getSelection().isReversed()).toBeFalsy()

    describe "select-to-beginning-of-line", ->
      it "selects text from cusor position to beginning of line", ->
        editor.setCursorScreenPosition [12,2]
        editor.addCursorAtScreenPosition [11,3]
        editor.trigger 'select-to-beginning-of-line'
        expect(editor.getCursors().length).toBe 2
        [cursor1, cursor2] = editor.getCursors()
        expect(cursor1.getBufferPosition()).toEqual [12,0]
        expect(cursor2.getBufferPosition()).toEqual [11,0]

        expect(editor.getSelections().length).toBe 2
        [selection1, selection2] = editor.getSelections()
        expect(selection1.getBufferRange()).toEqual [[12,0], [12,2]]
        expect(selection1.isReversed()).toBeTruthy()
        expect(selection2.getBufferRange()).toEqual [[11,0], [11,3]]
        expect(selection2.isReversed()).toBeTruthy()

    describe "select-to-end-of-line", ->
      it "selects text from cusor position to end of line", ->
        editor.setCursorScreenPosition [12,0]
        editor.addCursorAtScreenPosition [11,3]
        editor.trigger 'select-to-end-of-line'
        expect(editor.getCursors().length).toBe 2
        [cursor1, cursor2] = editor.getCursors()
        expect(cursor1.getBufferPosition()).toEqual [12,2]
        expect(cursor2.getBufferPosition()).toEqual [11,44]

        expect(editor.getSelections().length).toBe 2
        [selection1, selection2] = editor.getSelections()
        expect(selection1.getBufferRange()).toEqual [[12,0], [12,2]]
        expect(selection1.isReversed()).toBeFalsy()
        expect(selection2.getBufferRange()).toEqual [[11,3], [11,44]]
        expect(selection2.isReversed()).toBeFalsy()

    describe "select-to-beginning-of-word", ->
      it "selects text from cusor position to beginning of word", ->
        editor.setCursorScreenPosition [0,13]
        editor.addCursorAtScreenPosition [3,49]
        editor.trigger 'select-to-beginning-of-word'
        expect(editor.getCursors().length).toBe 2
        [cursor1, cursor2] = editor.getCursors()
        expect(cursor1.getBufferPosition()).toEqual [0,4]
        expect(cursor2.getBufferPosition()).toEqual [3,47]

        expect(editor.getSelections().length).toBe 2
        [selection1, selection2] = editor.getSelections()
        expect(selection1.getBufferRange()).toEqual [[0,4], [0,13]]
        expect(selection1.isReversed()).toBeTruthy()
        expect(selection2.getBufferRange()).toEqual [[3,47], [3,49]]
        expect(selection2.isReversed()).toBeTruthy()

    describe "select-to-end-of-word", ->
      it "selects text from cusor position to end of word", ->
        editor.setCursorScreenPosition [0,4]
        editor.addCursorAtScreenPosition [3,48]
        editor.trigger 'select-to-end-of-word'
        expect(editor.getCursors().length).toBe 2
        [cursor1, cursor2] = editor.getCursors()
        expect(cursor1.getBufferPosition()).toEqual [0,13]
        expect(cursor2.getBufferPosition()).toEqual [3,50]

        expect(editor.getSelections().length).toBe 2
        [selection1, selection2] = editor.getSelections()
        expect(selection1.getBufferRange()).toEqual [[0,4], [0,13]]
        expect(selection1.isReversed()).toBeFalsy()
        expect(selection2.getBufferRange()).toEqual [[3,48], [3,50]]
        expect(selection2.isReversed()).toBeFalsy()

  describe "multiple cursors", ->
    it "places multiple cursor with meta-click", ->
      editor.attachToDom()
      setEditorHeightInLines(editor, 5)
      editor.lines.trigger mousedownEvent(editor: editor, point: [3, 0])
      editor.scroller.scrollTop(editor.lineHeight * 6)

      spyOn(editor, "scrollTo").andCallThrough()

      editor.lines.trigger mousedownEvent(editor: editor, point: [6, 0], metaKey: true)
      expect(editor.scrollTo.callCount).toBe 1

      [cursor1, cursor2] = editor.find('.cursor').map -> $(this).view()
      expect(cursor1.position()).toEqual(top: 3 * editor.lineHeight, left: 0)
      expect(cursor1.getBufferPosition()).toEqual [3, 0]
      expect(cursor2.position()).toEqual(top: 6 * editor.lineHeight, left: 0)
      expect(cursor2.getBufferPosition()).toEqual [6, 0]

    describe "inserting text", ->
      describe "when cursors are on the same line", ->
        describe "when inserting newlines", ->
          it "breaks the line into three lines at the cursor locations", ->
            editor.setCursorScreenPosition([3, 13])
            editor.addCursorAtScreenPosition([3, 38])

            editor.insertText('\n')

            expect(editor.lineForBufferRow(3)).toBe "    var pivot"
            expect(editor.lineForBufferRow(4)).toBe " = items.shift(), current"
            expect(editor.lineForBufferRow(5)).toBe ", left = [], right = [];"
            expect(editor.lineForBufferRow(6)).toBe "    while(items.length > 0) {"

            [cursor1, cursor2] = editor.compositeCursor.getCursors()
            expect(cursor1.getBufferPosition()).toEqual [4, 0]
            expect(cursor2.getBufferPosition()).toEqual [5, 0]

      describe "when cursors are on different lines", ->
        describe "when inserting characters other than newlines", ->
          it "inserts text for all cursors", ->
            editor.setCursorScreenPosition([3, 0])
            editor.addCursorAtScreenPosition([6, 0])

            editor.insertText("abc")
            expect(editor.lineForBufferRow(3)).toBe "abc    var pivot = items.shift(), current, left = [], right = [];"
            expect(editor.lineForBufferRow(6)).toBe "abc      current < pivot ? left.push(current) : right.push(current);"

            [cursor1, cursor2] = editor.compositeCursor.getCursors()
            expect(cursor1.getBufferPosition()).toEqual [3,3]
            expect(cursor2.getBufferPosition()).toEqual [6,3]

        describe "when inserting newlines", ->
          it "inserts newlines for all cursors", ->
            editor.setCursorScreenPosition([3, 0])
            editor.addCursorAtScreenPosition([6, 0])

            editor.insertText("\n")
            expect(editor.lineForBufferRow(3)).toBe ""
            expect(editor.lineForBufferRow(4)).toBe "    var pivot = items.shift(), current, left = [], right = [];"
            expect(editor.lineForBufferRow(5)).toBe "    while(items.length > 0) {"
            expect(editor.lineForBufferRow(6)).toBe "      current = items.shift();"
            expect(editor.lineForBufferRow(7)).toBe ""
            expect(editor.lineForBufferRow(8)).toBe "      current < pivot ? left.push(current) : right.push(current);"
            expect(editor.lineForBufferRow(9)).toBe "    }"

            [cursor1, cursor2] = editor.compositeCursor.getCursors()
            expect(cursor1.getBufferPosition()).toEqual [4,0]
            expect(cursor2.getBufferPosition()).toEqual [8,0]

      describe "when selections are on the same line", ->
        beforeEach ->
          editor.setSelectionBufferRange([[0,4], [0,13]])
          editor.addSelectionForBufferRange([[0,22], [0,24]])

        describe "when inserting characters other than newlines", ->
          it "replaces each selection range with the inserted characters", ->
            editor.insertText("x")

            [cursor1, cursor2] = editor.compositeCursor.getCursors()
            [selection1, selection2] = editor.compositeSelection.getSelections()

            expect(cursor1.getScreenPosition()).toEqual [0, 5]
            expect(cursor2.getScreenPosition()).toEqual [0, 15]
            expect(selection1.isEmpty()).toBeTruthy()
            expect(selection2.isEmpty()).toBeTruthy()

            expect(editor.lineForBufferRow(0)).toBe "var x = functix () {"

        describe "when inserting newlines", ->
          it "replaces all selected ranges with newlines", ->
            editor.insertText("\n")

            [cursor1, cursor2] = editor.compositeCursor.getCursors()
            [selection1, selection2] = editor.compositeSelection.getSelections()

            expect(cursor1.getScreenPosition()).toEqual [1, 0]
            expect(cursor2.getScreenPosition()).toEqual [2, 0]
            expect(selection1.isEmpty()).toBeTruthy()
            expect(selection2.isEmpty()).toBeTruthy()

            expect(editor.lineForBufferRow(0)).toBe "var "
            expect(editor.lineForBufferRow(1)).toBe " = functi"
            expect(editor.lineForBufferRow(2)).toBe " () {"

    describe "backspace", ->
      describe "when cursors are on the same line", ->
        it "removes the characters preceding each cursor", ->
          editor.setCursorScreenPosition([3, 13])
          editor.addCursorAtScreenPosition([3, 38])

          editor.backspace()

          expect(editor.lineForBufferRow(3)).toBe "    var pivo = items.shift(), curren, left = [], right = [];"

          [cursor1, cursor2] = editor.compositeCursor.getCursors()
          expect(cursor1.getBufferPosition()).toEqual [3, 12]
          expect(cursor2.getBufferPosition()).toEqual [3, 36]

          [selection1, selection2] = editor.compositeSelection.getSelections()
          expect(selection1.isEmpty()).toBeTruthy()
          expect(selection2.isEmpty()).toBeTruthy()

      describe "when cursors are on different lines", ->
        it "removes the characters preceding each cursor", ->
          editor.setCursorScreenPosition([3, 13])
          editor.addCursorAtScreenPosition([4, 10])

          editor.backspace()

          expect(editor.lineForBufferRow(3)).toBe "    var pivo = items.shift(), current, left = [], right = [];"
          expect(editor.lineForBufferRow(4)).toBe "    whileitems.length > 0) {"

          [cursor1, cursor2] = editor.compositeCursor.getCursors()
          expect(cursor1.getBufferPosition()).toEqual [3, 12]
          expect(cursor2.getBufferPosition()).toEqual [4, 9]

          [selection1, selection2] = editor.compositeSelection.getSelections()
          expect(selection1.isEmpty()).toBeTruthy()
          expect(selection2.isEmpty()).toBeTruthy()

        describe "when backspacing over newlines", ->
          it "removes the newlines preceding each cursor", ->
            editor.setCursorScreenPosition([3, 0])
            editor.addCursorAtScreenPosition([6, 0])

            editor.backspace()
            expect(editor.lineForBufferRow(2)).toBe "    if (items.length <= 1) return items;    var pivot = items.shift(), current, left = [], right = [];"
            expect(editor.lineForBufferRow(3)).toBe "    while(items.length > 0) {"
            expect(editor.lineForBufferRow(4)).toBe "      current = items.shift();      current < pivot ? left.push(current) : right.push(current);"
            expect(editor.lineForBufferRow(5)).toBe "    }"

            [cursor1, cursor2] = editor.compositeCursor.getCursors()
            expect(cursor1.getBufferPosition()).toEqual [2,40]
            expect(cursor2.getBufferPosition()).toEqual [4,30]

      describe "when selections are on the same line", ->
        it "removes all selected text", ->
          editor.setSelectionBufferRange([[0,4], [0,13]])
          editor.addSelectionForBufferRange([[0,16], [0,24]])

          editor.backspace()

          expect(editor.lineForBufferRow(0)).toBe 'var  =  () {'

    describe "delete", ->
      describe "when cursors are on the same line", ->
        it "removes the characters following each cursor", ->
          editor.setCursorScreenPosition([3, 13])
          editor.addCursorAtScreenPosition([3, 38])

          editor.delete()

          expect(editor.lineForBufferRow(3)).toBe "    var pivot= items.shift(), current left = [], right = [];"

          [cursor1, cursor2] = editor.compositeCursor.getCursors()
          expect(cursor1.getBufferPosition()).toEqual [3, 13]
          expect(cursor2.getBufferPosition()).toEqual [3, 37]

          [selection1, selection2] = editor.compositeSelection.getSelections()
          expect(selection1.isEmpty()).toBeTruthy()
          expect(selection2.isEmpty()).toBeTruthy()

      describe "when cursors are on different lines", ->
        it "removes the characters following each cursor", ->
          editor.setCursorScreenPosition([3, 13])
          editor.addCursorAtScreenPosition([4, 10])

          editor.delete()

          expect(editor.lineForBufferRow(3)).toBe "    var pivot= items.shift(), current, left = [], right = [];"
          expect(editor.lineForBufferRow(4)).toBe "    while(tems.length > 0) {"

          [cursor1, cursor2] = editor.compositeCursor.getCursors()
          expect(cursor1.getBufferPosition()).toEqual [3, 13]
          expect(cursor2.getBufferPosition()).toEqual [4, 10]

          [selection1, selection2] = editor.compositeSelection.getSelections()
          expect(selection1.isEmpty()).toBeTruthy()
          expect(selection2.isEmpty()).toBeTruthy()

        describe "when deleting over newlines", ->
          it "removes the newlines following each cursor", ->
            editor.setCursorScreenPosition([0, 29])
            editor.addCursorAtScreenPosition([1, 30])

            editor.delete()

            expect(editor.lineForBufferRow(0)).toBe "var quicksort = function () {  var sort = function(items) {    if (items.length <= 1) return items;"

            [cursor1, cursor2] = editor.compositeCursor.getCursors()
            expect(cursor1.getBufferPosition()).toEqual [0,29]
            expect(cursor2.getBufferPosition()).toEqual [0,59]

        describe "when selections are on the same line", ->
          it "removes all selected text", ->
            editor.setSelectionBufferRange([[0,4], [0,13]])
            editor.addSelectionForBufferRange([[0,16], [0,24]])

            editor.delete()

            expect(editor.lineForBufferRow(0)).toBe 'var  =  () {'

    describe "keyboard movement", ->
      it "moves all cursors", ->
        editor.setCursorScreenPosition([3, 13])
        editor.addCursorAtScreenPosition([3, 38])
        editor.addCursorAtScreenPosition([4, 1])
        [cursor1, cursor2, cursor3] = editor.compositeCursor.getCursors()

        editor.moveCursorLeft()
        expect(cursor1.getBufferPosition()).toEqual [3, 12]
        expect(cursor2.getBufferPosition()).toEqual [3, 37]
        expect(cursor3.getBufferPosition()).toEqual [4, 0]

        editor.moveCursorLeft()
        expect(cursor1.getBufferPosition()).toEqual [3, 11]
        expect(cursor2.getBufferPosition()).toEqual [3, 36]
        expect(cursor3.getBufferPosition()).toEqual [3, 62]

        editor.moveCursorRight()
        expect(cursor1.getBufferPosition()).toEqual [3, 12]
        expect(cursor2.getBufferPosition()).toEqual [3, 37]
        expect(cursor3.getBufferPosition()).toEqual [4, 0]

        editor.moveCursorDown()
        expect(cursor1.getBufferPosition()).toEqual [4, 12]
        expect(cursor2.getBufferPosition()).toEqual [4, 29]
        expect(cursor3.getBufferPosition()).toEqual [5, 0]

        editor.moveCursorUp()
        expect(cursor1.getBufferPosition()).toEqual [3, 12]
        expect(cursor2.getBufferPosition()).toEqual [3, 37]
        expect(cursor3.getBufferPosition()).toEqual [4, 0]

    describe "selections", ->
      describe "upon clicking and dragging with the meta-key held down", ->
        it "adds an additional selection upon clicking and dragging with the meta-key held down", ->
          editor.attachToDom()
          editor.lines.trigger mousedownEvent(editor: editor, point: [4, 10])
          editor.lines.trigger mousemoveEvent(editor: editor, point: [5, 27])
          editor.lines.trigger 'mouseup'

          editor.lines.trigger mousedownEvent(editor: editor, point: [6, 10], metaKey: true)
          editor.lines.trigger mousemoveEvent(editor: editor, point: [8, 27], metaKey: true)
          editor.lines.trigger 'mouseup'

          selections = editor.compositeSelection.getSelections()
          expect(selections.length).toBe 2
          [selection1, selection2] = selections
          expect(selection1.getScreenRange()).toEqual [[4, 10], [5, 27]]
          expect(selection2.getScreenRange()).toEqual [[6, 10], [8, 27]]

        it "merges selections when they intersect, maintaining the directionality of the newest selection", ->
          editor.attachToDom()
          editor.lines.trigger mousedownEvent(editor: editor, point: [4, 10])
          editor.lines.trigger mousemoveEvent(editor: editor, point: [5, 27])
          editor.lines.trigger 'mouseup'

          editor.lines.trigger mousedownEvent(editor: editor, point: [3, 10], metaKey: true)
          editor.lines.trigger mousemoveEvent(editor: editor, point: [6, 27], metaKey: true)
          editor.lines.trigger 'mouseup'

          selections = editor.compositeSelection.getSelections()
          expect(selections.length).toBe 1
          [selection1] = selections
          expect(selection1.getScreenRange()).toEqual [[3, 10], [6, 27]]
          expect(selection1.isReversed()).toBeFalsy()

          editor.lines.trigger mousedownEvent(editor: editor, point: [7, 4], metaKey: true)
          editor.lines.trigger mousemoveEvent(editor: editor, point: [4, 11], metaKey: true)
          editor.lines.trigger 'mouseup'

          selections = editor.compositeSelection.getSelections()
          expect(selections.length).toBe 1
          [selection1] = selections
          expect(selection1.getScreenRange()).toEqual [[3, 10], [7, 4]]
          expect(selection1.isReversed()).toBeTruthy()

      describe "upon moving the cursor with the arrow keys with the shift key held down", ->
        it "resizes all selections", ->
          editor.setSelectionBufferRange [[0,9], [0,13]]
          editor.addSelectionForBufferRange [[3,16], [3,21]]
          [selection1, selection2] = editor.compositeSelection.getSelections()

          editor.selectRight()
          expect(selection1.getBufferRange()).toEqual [[0,9], [0,14]]
          expect(selection2.getBufferRange()).toEqual [[3,16], [3,22]]

          editor.selectLeft()
          editor.selectLeft()
          expect(selection1.getBufferRange()).toEqual [[0,9], [0,12]]
          expect(selection2.getBufferRange()).toEqual [[3,16], [3,20]]

          editor.selectDown()
          expect(selection1.getBufferRange()).toEqual [[0,9], [1,12]]
          expect(selection2.getBufferRange()).toEqual [[3,16], [4,20]]

          editor.selectUp()
          expect(selection1.getBufferRange()).toEqual [[0,9], [0,12]]
          expect(selection2.getBufferRange()).toEqual [[3,16], [3,20]]

        it "merges selections when they intersect when moving down", ->
          editor.setSelectionBufferRange [[0,9], [0,13]]
          editor.addSelectionForBufferRange [[1,10], [1,20]]
          editor.addSelectionForBufferRange [[2,15], [3,25]]
          [selection1, selection2, selection3] = editor.compositeSelection.getSelections()

          editor.selectDown()
          expect(editor.compositeSelection.getSelections()).toEqual [selection1]
          expect(selection1.getScreenRange()).toEqual([[0, 9], [4, 25]])
          expect(selection1.isReversed()).toBeFalsy()
          expect(selection2.parent()).not.toExist()
          expect(selection3.parent()).not.toExist()

        it "merges selections when they intersect when moving up", ->
          editor.setSelectionBufferRange [[0,9], [0,13]], reverse: true
          editor.addSelectionForBufferRange [[1,10], [1,20]], reverse: true
          [selection1, selection2] = editor.compositeSelection.getSelections()

          editor.selectUp()
          expect(editor.compositeSelection.getSelections()).toEqual [selection1]
          expect(selection1.getScreenRange()).toEqual([[0, 0], [1, 20]])
          expect(selection1.isReversed()).toBeTruthy()
          expect(selection2.parent()).not.toExist()

        it "merges selections when they intersect when moving left", ->
          editor.setSelectionBufferRange [[0,9], [0,13]], reverse: true
          editor.addSelectionForBufferRange [[0,14], [1,20]], reverse: true
          [selection1, selection2] = editor.compositeSelection.getSelections()

          editor.selectLeft()
          expect(editor.compositeSelection.getSelections()).toEqual [selection1]
          expect(selection1.getScreenRange()).toEqual([[0, 8], [1, 20]])
          expect(selection1.isReversed()).toBeTruthy()
          expect(selection2.parent()).not.toExist()

        it "merges selections when they intersect when moving right", ->
          editor.setSelectionBufferRange [[0,9], [0,13]]
          editor.addSelectionForBufferRange [[0,14], [1,20]]
          [selection1, selection2] = editor.compositeSelection.getSelections()

          editor.selectRight()
          expect(editor.compositeSelection.getSelections()).toEqual [selection1]
          expect(selection1.getScreenRange()).toEqual([[0, 9], [1, 21]])
          expect(selection1.isReversed()).toBeFalsy()
          expect(selection2.parent()).not.toExist()

    describe "cursor merging", ->
      it "merges cursors when they overlap due to a buffer change", ->
        editor.setCursorScreenPosition([0, 0])
        editor.addCursorAtScreenPosition([0, 1])
        editor.addCursorAtScreenPosition([1, 1])

        [cursor1, cursor2, cursor3] = editor.compositeCursor.getCursors()
        expect(editor.compositeCursor.getCursors().length).toBe 3

        editor.backspace()
        expect(editor.compositeCursor.getCursors().length).toBe 2
        expect(cursor1.getBufferPosition()).toEqual [0,0]
        expect(cursor3.getBufferPosition()).toEqual [1,0]
        expect(cursor2.parent().length).toBe 0

        editor.insertText "x"
        expect(editor.lineForBufferRow(0)).toBe "xar quicksort = function () {"
        expect(editor.lineForBufferRow(1)).toBe "x var sort = function(items) {"

      it "merges cursors when they overlap due to movement", ->
        editor.setCursorScreenPosition([0, 0])
        editor.addCursorAtScreenPosition([0, 1])

        [cursor1, cursor2] = editor.compositeCursor.getCursors()
        editor.moveCursorLeft()
        expect(editor.compositeCursor.getCursors().length).toBe 1
        expect(cursor2.parent()).not.toExist()
        expect(cursor1.getBufferPosition()).toEqual [0,0]

        editor.addCursorAtScreenPosition([1, 0])
        [cursor1, cursor2] = editor.compositeCursor.getCursors()

        editor.moveCursorUp()
        expect(editor.compositeCursor.getCursors().length).toBe 1
        expect(cursor2.parent()).not.toExist()
        expect(cursor1.getBufferPosition()).toEqual [0,0]

        editor.setCursorScreenPosition([12, 2])
        editor.addCursorAtScreenPosition([12, 1])
        [cursor1, cursor2] = editor.compositeCursor.getCursors()

        editor.moveCursorRight()
        expect(editor.compositeCursor.getCursors().length).toBe 1
        expect(cursor2.parent()).not.toExist()
        expect(cursor1.getBufferPosition()).toEqual [12,2]

        editor.addCursorAtScreenPosition([11, 2])
        [cursor1, cursor2] = editor.compositeCursor.getCursors()

        editor.moveCursorDown()
        expect(editor.compositeCursor.getCursors().length).toBe 1
        expect(cursor2.parent()).not.toExist()
        expect(cursor1.getBufferPosition()).toEqual [12,2]

      it "merges cursors when the mouse is clicked without the meta-key", ->
        editor.attachToDom()
        editor.setCursorScreenPosition([0, 0])
        editor.addCursorAtScreenPosition([0, 1])

        [cursor1, cursor2] = editor.compositeCursor.getCursors()
        editor.lines.trigger mousedownEvent(editor: editor, point: [4, 7])
        expect(editor.compositeCursor.getCursors().length).toBe 1
        expect(cursor2.parent()).not.toExist()
        expect(cursor1.getBufferPosition()).toEqual [4, 7]

        editor.lines.trigger mousemoveEvent(editor: editor, point: [5, 27])

        selections = editor.compositeSelection.getSelections()
        expect(selections.length).toBe 1
        expect(selections[0].getBufferRange()).toEqual [[4,7], [5,27]]

  describe "buffer manipulation", ->
    describe "when text input events are triggered on the hidden input element", ->
      describe "when there is no selection", ->
        it "inserts the typed character at the cursor position, both in the buffer and the pre element", ->
          editor.setCursorScreenPosition(row: 1, column: 6)

          expect(buffer.lineForRow(1).charAt(6)).not.toBe 'q'

          editor.hiddenInput.textInput 'q'

          expect(buffer.lineForRow(1).charAt(6)).toBe 'q'
          expect(editor.getCursorScreenPosition()).toEqual(row: 1, column: 7)
          expect(editor.lines.find('.line:eq(1)')).toHaveText buffer.lineForRow(1)

        it "does not update the cursor position if the editor is not focused", ->
          editor.isFocused = false
          editor.buffer.insert([5, 0], 'blah')
          expect(editor.getCursorScreenPosition()).toEqual [0, 0]

      describe "when there is a selection", ->
        it "replaces the selected text with the typed text", ->
          editor.setSelectionBufferRange(new Range([1, 6], [2, 4]))
          editor.hiddenInput.textInput 'q'
          expect(buffer.lineForRow(1)).toBe '  var qif (items.length <= 1) return items;'

        it "always places the cursor after the selection", ->
          editor.setSelectionBufferRange(new Range([1, 6], [2, 4]), reverse: true)
          editor.hiddenInput.textInput 'q'
          expect(buffer.lineForRow(1)).toBe '  var qif (items.length <= 1) return items;'
          expect(editor.getCursorScreenPosition()).toEqual [1, 7]

    describe "return", ->
      describe "when the cursor is at the beginning of a line", ->
        it "inserts an empty line before it", ->
          editor.setCursorScreenPosition(row: 1, column: 0)

          editor.trigger keydownEvent('enter')

          expect(editor.lines.find('.line:eq(1)')).toHaveHtml '&nbsp;'
          expect(editor.getCursorScreenPosition()).toEqual(row: 2, column: 0)

      describe "when the cursor is in the middle of a line", ->
        it "splits the current line to form a new line", ->
          editor.setCursorScreenPosition(row: 1, column: 6)

          originalLine = editor.lines.find('.line:eq(1)').text()
          lineBelowOriginalLine = editor.lines.find('.line:eq(2)').text()
          editor.trigger keydownEvent('enter')

          expect(editor.lines.find('.line:eq(1)')).toHaveText originalLine[0...6]
          expect(editor.lines.find('.line:eq(2)')).toHaveText originalLine[6..]
          expect(editor.lines.find('.line:eq(3)')).toHaveText lineBelowOriginalLine
          expect(editor.getCursorScreenPosition()).toEqual(row: 2, column: 0)

      describe "when the cursor is on the end of a line", ->
        it "inserts an empty line after it", ->
          editor.setCursorScreenPosition(row: 1, column: buffer.lineForRow(1).length)

          editor.trigger keydownEvent('enter')

          expect(editor.lines.find('.line:eq(2)')).toHaveHtml '&nbsp;'
          expect(editor.getCursorScreenPosition()).toEqual(row: 2, column: 0)

    describe "backspace", ->
      describe "when the cursor is on the middle of the line", ->
        it "removes the character before the cursor", ->
          editor.setCursorScreenPosition(row: 1, column: 7)
          expect(buffer.lineForRow(1)).toBe "  var sort = function(items) {"

          editor.trigger keydownEvent('backspace')

          line = buffer.lineForRow(1)
          expect(line).toBe "  var ort = function(items) {"
          expect(editor.lines.find('.line:eq(1)')).toHaveText line
          expect(editor.getCursorScreenPosition()).toEqual {row: 1, column: 6}

      describe "when the cursor is at the beginning of a line", ->
        it "joins it with the line above", ->
          originalLine0 = buffer.lineForRow(0)
          expect(originalLine0).toBe "var quicksort = function () {"
          expect(buffer.lineForRow(1)).toBe "  var sort = function(items) {"

          editor.setCursorScreenPosition(row: 1, column: 0)
          editor.trigger keydownEvent('backspace')

          line0 = buffer.lineForRow(0)
          line1 = buffer.lineForRow(1)
          expect(line0).toBe "var quicksort = function () {  var sort = function(items) {"
          expect(line1).toBe "    if (items.length <= 1) return items;"

          expect(editor.lines.find('.line:eq(0)')).toHaveText line0
          expect(editor.lines.find('.line:eq(1)')).toHaveText line1
          expect(editor.getCursorScreenPosition()).toEqual {row: 0, column: originalLine0.length}

      describe "when the cursor is at the first column of the first line", ->
        it "does nothing, but doesn't raise an error", ->
          editor.setCursorScreenPosition(row: 0, column: 0)
          editor.trigger keydownEvent('backspace')

      describe "when there is a selection", ->
        it "deletes the selection, but not the character before it", ->
          editor.getSelection().setBufferRange(new Range([0,5], [0,9]))
          editor.trigger keydownEvent('backspace')
          expect(editor.buffer.lineForRow(0)).toBe 'var qsort = function () {'

    describe "backspace-to-beginning-of-word", ->
      describe "when no text is selected", ->
        it "deletes all text between the cursor and the beginning of the word", ->
          editor.setCursorBufferPosition([1, 24])
          editor.addCursorAtBufferPosition([2, 5])
          [cursor1, cursor2] = editor.getCursors()

          editor.trigger 'backspace-to-beginning-of-word'
          expect(buffer.lineForRow(1)).toBe '  var sort = function(ems) {'
          expect(buffer.lineForRow(2)).toBe '    f (items.length <= 1) return items;'
          expect(cursor1.getBufferPosition()).toEqual [1, 22]
          expect(cursor2.getBufferPosition()).toEqual [2, 4]

          editor.trigger 'backspace-to-beginning-of-word'
          expect(buffer.lineForRow(1)).toBe '  var sort = functionems) f (items.length <= 1) return items;'
          expect(cursor1.getBufferPosition()).toEqual [1, 21]
          expect(cursor2.getBufferPosition()).toEqual [1, 26]

      describe "when text is selected", ->
        it "deletes only selected text", ->
          editor.setSelectionBufferRange([[1, 24], [1, 27]])
          editor.trigger 'backspace-to-beginning-of-word'
          expect(buffer.lineForRow(1)).toBe '  var sort = function(it) {'

    describe "delete", ->
      describe "when the cursor is on the middle of a line", ->
        it "deletes the character following the cursor", ->
          editor.setCursorScreenPosition([1, 6])
          editor.trigger keydownEvent('delete')
          expect(buffer.lineForRow(1)).toBe '  var ort = function(items) {'

      describe "when the cursor is on the end of a line", ->
        it "joins the line with the following line", ->
          editor.setCursorScreenPosition([1, buffer.lineForRow(1).length])
          editor.trigger keydownEvent('delete')
          expect(buffer.lineForRow(1)).toBe '  var sort = function(items) {    if (items.length <= 1) return items;'

      describe "when there is a selection", ->
        it "deletes the selection, but not the character following it", ->
          editor.getSelection().setBufferRange(new Range([1,6], [1,8]))
          editor.trigger keydownEvent 'delete'
          expect(buffer.lineForRow(1)).toBe '  var rt = function(items) {'

      describe "when the cursor is on the last column of the last line", ->
        it "does nothing, but doesn't raise an error", ->
          editor.setCursorScreenPosition([12, buffer.lineForRow(12).length])
          editor.trigger keydownEvent('delete')
          expect(buffer.lineForRow(12)).toBe '};'

      describe "when multiple lines are removed from the buffer (regression)", ->
        it "removes all of them from the dom", ->
          buffer.change(new Range([6, 24], [12, 0]), '')
          expect(editor.find('.line').length).toBe 7
          expect(editor.find('.line:eq(6)').text()).toBe(buffer.lineForRow(6))

    describe "delete-to-end-of-word", ->
      describe "when no text is selected", ->
        it "deletes to the end of the word", ->
          editor.setCursorBufferPosition([1, 24])
          editor.addCursorAtBufferPosition([2, 5])
          [cursor1, cursor2] = editor.getCursors()

          editor.trigger 'delete-to-end-of-word'
          expect(buffer.lineForRow(1)).toBe '  var sort = function(it) {'
          expect(buffer.lineForRow(2)).toBe '    i (items.length <= 1) return items;'
          expect(cursor1.getBufferPosition()).toEqual [1, 24]
          expect(cursor2.getBufferPosition()).toEqual [2, 5]

          editor.trigger 'delete-to-end-of-word'
          expect(buffer.lineForRow(1)).toBe '  var sort = function(it {'
          expect(buffer.lineForRow(2)).toBe '    iitems.length <= 1) return items;'
          expect(cursor1.getBufferPosition()).toEqual [1, 24]
          expect(cursor2.getBufferPosition()).toEqual [2, 5]

      describe "when text is selected", ->
        it "deletes only selected text", ->
          editor.setSelectionBufferRange([[1, 24], [1, 27]])
          editor.trigger 'delete-to-end-of-word'
          expect(buffer.lineForRow(1)).toBe '  var sort = function(it) {'

    describe "cut-to-end-of-line", ->
      pasteboard = null

      beforeEach ->
        spyOn($native, 'writeToPasteboard').andCallFake (text) -> pasteboard = text
        spyOn($native, 'readFromPasteboard').andCallFake -> pasteboard

      describe "when nothing is selected", ->
        it "cuts up to the end of the line", ->
          editor.setCursorBufferPosition([2, 20])
          editor.addCursorAtBufferPosition([3, 20])
          editor.trigger 'cut-to-end-of-line'

          expect(buffer.lineForRow(2)).toBe '    if (items.length'
          expect(buffer.lineForRow(3)).toBe '    var pivot = item'

          expect(pasteboard).toBe ' <= 1) return items;\ns.shift(), current, left = [], right = [];'

      describe "when text is selected", ->
        it "only cuts the selected text, not to the end of the line", ->
          editor.setSelectedBufferRanges([[[2,20], [2, 30]], [[3, 20], [3, 20]]])

          editor.trigger 'cut-to-end-of-line'

          expect(buffer.lineForRow(2)).toBe '    if (items.lengthurn items;'
          expect(buffer.lineForRow(3)).toBe '    var pivot = item'

          expect(pasteboard).toBe ' <= 1) ret\ns.shift(), current, left = [], right = [];'

    describe "tab", ->
      describe "if editor.softTabs is true (the default)", ->
        it "inserts editor.tabText into the buffer", ->
          tabRegex = new RegExp("^#{editor.tabText}")
          expect(buffer.lineForRow(0)).not.toMatch(tabRegex)
          editor.trigger 'tab'
          expect(buffer.lineForRow(0)).toMatch(tabRegex)

      describe "if editor.softTabs is false", ->
        it "inserts a tab character into the buffer", ->
          editor.softTabs = false
          expect(buffer.lineForRow(0)).not.toMatch(/^\t/)
          editor.trigger 'tab'
          expect(buffer.lineForRow(0)).toMatch(/^\t/)
          expect(editor.getCursorBufferPosition()).toEqual [0, 1]
          expect(editor.getCursorScreenPosition()).toEqual [0, editor.tabText.length]

          editor.trigger 'tab'
          expect(buffer.lineForRow(0)).toMatch(/^\t\t/)
          expect(editor.getCursorBufferPosition()).toEqual [0, 2]
          expect(editor.getCursorScreenPosition()).toEqual [0, editor.tabText.length * 2]

    describe "undo/redo", ->
      it "undoes/redoes the last change", ->
        buffer.insert [0, 0], "foo"
        editor.trigger 'undo'
        expect(buffer.lineForRow(0)).not.toContain "foo"

        editor.trigger 'redo'
        expect(buffer.lineForRow(0)).toContain "foo"

      it "batches the undo / redo of changes caused by multiple cursors", ->
        editor.setCursorScreenPosition([0, 0])
        editor.addCursorAtScreenPosition([1, 0])

        editor.insertText("foo")
        editor.backspace()

        expect(buffer.lineForRow(0)).toContain "fovar"
        expect(buffer.lineForRow(1)).toContain "fo "

        editor.trigger 'undo'

        expect(buffer.lineForRow(0)).toContain "foo"
        expect(buffer.lineForRow(1)).toContain "foo"

        editor.trigger 'undo'

        expect(buffer.lineForRow(0)).not.toContain "foo"
        expect(buffer.lineForRow(1)).not.toContain "foo"

      it "restores the selected ranges after undo", ->
        editor.setSelectedBufferRanges([[[1, 6], [1, 10]], [[1, 22], [1, 27]]])
        editor.delete()
        editor.delete()

        selections = editor.getSelections()
        expect(buffer.lineForRow(1)).toBe '  var = function( {'
        expect(selections[0].getBufferRange()).toEqual [[1, 6], [1, 6]]
        expect(selections[1].getBufferRange()).toEqual [[1, 17], [1, 17]]

        editor.trigger 'undo'
        expect(selections[0].getBufferRange()).toEqual [[1, 6], [1, 6]]
        expect(selections[1].getBufferRange()).toEqual [[1, 18], [1, 18]]

        editor.trigger 'undo'
        expect(selections[0].getBufferRange()).toEqual [[1, 6], [1, 10]]
        expect(selections[1].getBufferRange()).toEqual [[1, 22], [1, 27]]

        editor.trigger 'redo'
        expect(selections[0].getBufferRange()).toEqual [[1, 6], [1, 6]]
        expect(selections[1].getBufferRange()).toEqual [[1, 18], [1, 18]]

      it "restores the selected ranges after redo", ->
        editor.setSelectedBufferRanges([[[1, 6], [1, 10]], [[1, 22], [1, 27]]])
        selections = editor.getSelections()

        editor.insertText("booboo")
        expect(selections[0].getBufferRange()).toEqual [[1, 12], [1, 12]]
        expect(selections[1].getBufferRange()).toEqual [[1, 30], [1, 30]]

        editor.undo()
        editor.redo()

        expect(selections[0].getBufferRange()).toEqual [[1, 12], [1, 12]]
        expect(selections[1].getBufferRange()).toEqual [[1, 30], [1, 30]]

  describe "when the editor is attached to the dom", ->
    it "calculates line height and char width and updates the pixel position of the cursor", ->
      expect(editor.lineHeight).toBeNull()
      expect(editor.charWidth).toBeNull()
      editor.setCursorScreenPosition(row: 2, column: 2)

      editor.attachToDom()

      expect(editor.lineHeight).not.toBeNull()
      expect(editor.charWidth).not.toBeNull()
      expect(editor.find('.cursor').offset()).toEqual pagePixelPositionForPoint(editor, [2, 2])

    it "is focused", ->
      editor.attachToDom()
      expect(editor).toMatchSelector ":has(:focus)"

    it "unsubscribes from the buffer when it is removed from the dom", ->
      buffer = new Buffer
      previousSubscriptionCount = buffer.subscriptionCount()

      editor.attachToDom()
      editor.setBuffer(buffer)

      expect(buffer.subscriptionCount()).toBeGreaterThan previousSubscriptionCount
      expect($('.editor')).toExist()
      editor.remove()
      expect(buffer.subscriptionCount()).toBe previousSubscriptionCount
      expect($('.editor')).not.toExist()

  describe "when the editor recieves focused", ->
    it "focuses the hidden input", ->
      editor.attachToDom()
      editor.focus()
      expect(editor).not.toMatchSelector ':focus'
      expect(editor.hiddenInput).toMatchSelector ':focus'

  describe "when the hidden input is focused / unfocused", ->
    it "assigns the isFocused flag on the editor and also adds/removes the .focused css class", ->
      editor.attachToDom()
      editor.isFocused = false
      editor.hiddenInput.focus()
      expect(editor.isFocused).toBeTruthy()
      expect(editor).toHaveClass('focused')

      editor.hiddenInput.focusout()
      expect(editor.isFocused).toBeFalsy()
      expect(editor).not.toHaveClass('focused')

  describe ".setBuffer(buffer)", ->
    it "sets the cursor to the beginning of the file", ->
      expect(editor.getCursorScreenPosition()).toEqual(row: 0, column: 0)

    it "recalls the cursor position and scroll position when the same buffer is re-assigned", ->
      editor.attachToDom()
      editor.height(editor.lineHeight * 5)
      editor.width(editor.charWidth * 30)
      editor.setCursorScreenPosition([8, 28])
      advanceClock()

      previousScrollTop = editor.scroller.scrollTop()
      previousScrollLeft = editor.scroller.scrollLeft()

      editor.setBuffer(new Buffer)
      expect(editor.getCursorScreenPosition()).toEqual [0, 0]
      expect(editor.scroller.scrollTop()).toBe 0
      expect(editor.scroller.scrollLeft()).toBe 0

      editor.setBuffer(buffer)
      expect(editor.getCursorScreenPosition()).toEqual [8, 28]
      expect(editor.scroller.scrollTop()).toBe previousScrollTop
      expect(editor.scroller.scrollLeft()).toBe previousScrollLeft

    it "recalls the undo history of the buffer when it is re-assigned", ->
      editor.insertText('xyz')

      otherBuffer = new Buffer
      editor.setBuffer(otherBuffer)
      editor.insertText('abc')
      expect(otherBuffer.lineForRow(0)).toBe 'abc'
      editor.undo()
      expect(otherBuffer.lineForRow(0)).toBe ''

      editor.setBuffer(buffer)
      editor.undo()
      expect(buffer.lineForRow(0)).toBe 'var quicksort = function () {'
      editor.redo()
      expect(buffer.lineForRow(0)).toBe 'xyzvar quicksort = function () {'

      editor.setBuffer(otherBuffer)
      editor.redo()
      expect(otherBuffer.lineForRow(0)).toBe 'abc'

    it "fully unsubscribes from the previously assigned buffer", ->
      otherBuffer = new Buffer
      previousSubscriptionCount = otherBuffer.subscriptionCount()

      editor.setBuffer(otherBuffer)
      expect(otherBuffer.subscriptionCount()).toBeGreaterThan previousSubscriptionCount

      editor.setBuffer(buffer)
      expect(otherBuffer.subscriptionCount()).toBe previousSubscriptionCount

  describe ".clipScreenPosition(point)", ->
    it "selects the nearest valid position to the given point", ->
      expect(editor.clipScreenPosition(row: 1000, column: 0)).toEqual(row: buffer.getLastRow(), column: buffer.lineForRow(buffer.getLastRow()).length)
      expect(editor.clipScreenPosition(row: -5, column: 0)).toEqual(row: 0, column: 0)
      expect(editor.clipScreenPosition(row: 1, column: 10000)).toEqual(row: 1, column: buffer.lineForRow(1).length)
      expect(editor.clipScreenPosition(row: 1, column: -5)).toEqual(row: 1, column: 0)

  describe "cut, copy & paste", ->
    pasteboard = null
    beforeEach ->
      pasteboard = 'first'
      spyOn($native, 'writeToPasteboard').andCallFake (text) -> pasteboard = text
      spyOn($native, 'readFromPasteboard').andCallFake -> pasteboard

    describe "with a single selection", ->
      beforeEach ->
        editor.setSelectionBufferRange([[0, 4], [0, 13]])

      describe "when a cut event is triggered", ->
        it "removes the selected text from the buffer and places it on the pasteboard", ->
          editor.trigger "cut"
          expect(buffer.lineForRow(0)).toBe "var  = function () {"
          expect($native.readFromPasteboard()).toBe 'quicksort'

      describe "when a copy event is triggered", ->
        it "copies selected text onto the clipboard", ->
          editor.trigger "copy"
          expect(buffer.lineForRow(0)).toBe "var quicksort = function () {"
          expect($native.readFromPasteboard()).toBe 'quicksort'

      describe "when a paste event is triggered", ->
        it "pastes text into the buffer", ->
          editor.trigger "paste"
          expect(editor.buffer.lineForRow(0)).toBe "var first = function () {"

    describe "with multiple selections", ->
      beforeEach ->
        editor.setSelectionBufferRange([[0, 4], [0, 13]])
        editor.addSelectionForBufferRange([[1, 6], [1, 10]])

      describe "when a cut event is triggered", ->
        it "removes the selected text from the buffer and places it on the pasteboard", ->
          editor.trigger "cut"
          expect(buffer.lineForRow(0)).toBe "var  = function () {"
          expect(buffer.lineForRow(1)).toBe "  var  = function(items) {"

          expect($native.readFromPasteboard()).toBe 'quicksort\nsort'

      describe "when a copy event is triggered", ->
        it "copies selected text onto the clipboard", ->
          editor.trigger "copy"
          expect(buffer.lineForRow(0)).toBe "var quicksort = function () {"
          expect(buffer.lineForRow(1)).toBe "  var sort = function(items) {"
          expect($native.readFromPasteboard()).toBe 'quicksort\nsort'

      describe "when a paste event is triggered", ->
        it "pastes text into the buffer", ->
          editor.trigger "paste"
          expect(editor.buffer.lineForRow(0)).toBe "var first = function () {"
          expect(buffer.lineForRow(1)).toBe "  var first = function(items) {"

  describe "folding", ->
    describe "when a fold-selection event is triggered", ->
      it "folds the selected text and moves the cursor to just after the placeholder, then treats the placeholder as a single character", ->
        editor.getSelection().setBufferRange(new Range([4, 29], [7, 4]))
        editor.trigger 'fold-selection'

        expect(editor.lines.find('.line:eq(4)').find('.fold-placeholder')).toExist()
        expect(editor.lines.find('.line:eq(5)').text()).toBe '    return sort(left).concat(pivot).concat(sort(right));'

        expect(editor.getSelection().isEmpty()).toBeTruthy()
        expect(editor.getCursorScreenPosition()).toEqual [4, 32]

        editor.setCursorBufferPosition([9, 4])
        expect(editor.getCursorScreenPosition()).toEqual [6, 4]

        editor.insertText('x')
        expect(editor.getCursorScreenPosition()).toEqual [6, 5]
        expect(editor.getCursorBufferPosition()).toEqual [9, 5]

        editor.setCursorScreenPosition([4, 30])
        expect(editor.getCursorScreenPosition()).toEqual [4, 29]
        editor.moveCursorRight()
        expect(editor.getCursorScreenPosition()).toEqual [4, 32]

    describe "when a fold placeholder is clicked", ->
      it "removes the associated fold and places the cursor at its beginning", ->
        editor.getSelection().setBufferRange(new Range([4, 29], [7, 4]))
        editor.trigger 'fold-selection'

        editor.find('.fold-placeholder .ellipsis').mousedown()

        expect(editor.find('.fold-placeholder')).not.toExist()
        expect(editor.lines.find('.line:eq(5)').text()).toBe '      current = items.shift();'

        expect(editor.getCursorBufferPosition()).toEqual [4, 29]

    describe "when there is nothing on a line except a fold placeholder", ->
      it "follows the placeholder with a non-breaking space to ensure the line has the proper height", ->
        editor.createFold([[1, 0], [1, 30]])
        expect(editor.lines.find('.line:eq(1)').html()).toMatch /&nbsp;$/

  describe ".save()", ->
    describe "when the current buffer has a path", ->
      tempFilePath = null

      beforeEach ->
        tempFilePath = '/tmp/atom-temp.txt'
        editor.setBuffer new Buffer(tempFilePath)
        expect(editor.buffer.getPath()).toBe tempFilePath

      afterEach ->
        expect(fs.remove(tempFilePath))

      it "saves the current buffer to disk", ->
        editor.buffer.setText 'Edited!'
        expect(fs.exists(tempFilePath)).toBeFalsy()

        editor.save()

        expect(fs.exists(tempFilePath)).toBeTruthy()
        expect(fs.read(tempFilePath)).toBe 'Edited!'

    describe "when the current buffer has no path", ->
      selectedFilePath = null
      beforeEach ->
        editor.setBuffer new Buffer()
        expect(editor.buffer.getPath()).toBeUndefined()
        editor.buffer.setText 'Save me to a new path'
        spyOn($native, 'saveDialog').andCallFake -> selectedFilePath

      it "presents a 'save as' dialog", ->
        editor.save()
        expect($native.saveDialog).toHaveBeenCalled()

      describe "when a path is chosen", ->
        it "saves the buffer to the chosen path", ->
          selectedFilePath = '/tmp/temp.txt'

          editor.save()

          expect(fs.exists(selectedFilePath)).toBeTruthy()
          expect(fs.read(selectedFilePath)).toBe 'Save me to a new path'

      describe "when dialog is cancelled", ->
        it "does not save the buffer", ->
          selectedFilePath = null
          editor.save()
          expect(fs.exists(selectedFilePath)).toBeFalsy()

  describe ".spliceLineElements(startRow, rowCount, lineElements)", ->
    elements = null

    beforeEach ->
      elements = $$ ->
        @div "A", class: 'line'
        @div "B", class: 'line'

    describe "when the start row is 0", ->
      describe "when the row count is 0", ->
        it "inserts the given elements before the first row", ->
          editor.spliceLineElements 0, 0, elements

          expect(editor.lines.find('.line:eq(0)').text()).toBe 'A'
          expect(editor.lines.find('.line:eq(1)').text()).toBe 'B'
          expect(editor.lines.find('.line:eq(2)').text()).toBe 'var quicksort = function () {'

      describe "when the row count is > 0", ->
        it "replaces the initial rows with the given elements", ->
          editor.spliceLineElements 0, 2, elements

          expect(editor.lines.find('.line:eq(0)').text()).toBe 'A'
          expect(editor.lines.find('.line:eq(1)').text()).toBe 'B'
          expect(editor.lines.find('.line:eq(2)').text()).toBe '    if (items.length <= 1) return items;'

    describe "when the start row is less than the last row", ->
      describe "when the row count is 0", ->
        it "inserts the elements at the specified location", ->
          editor.spliceLineElements 2, 0, elements

          expect(editor.lines.find('.line:eq(2)').text()).toBe 'A'
          expect(editor.lines.find('.line:eq(3)').text()).toBe 'B'
          expect(editor.lines.find('.line:eq(4)').text()).toBe '    if (items.length <= 1) return items;'

      describe "when the row count is > 0", ->
        it "replaces the elements at the specified location", ->
          editor.spliceLineElements 2, 2, elements

          expect(editor.lines.find('.line:eq(2)').text()).toBe 'A'
          expect(editor.lines.find('.line:eq(3)').text()).toBe 'B'
          expect(editor.lines.find('.line:eq(4)').text()).toBe '    while(items.length > 0) {'

    describe "when the start row is the last row", ->
      it "appends the elements to the end of the lines", ->
        editor.spliceLineElements 13, 0, elements

        expect(editor.lines.find('.line:eq(12)').text()).toBe '};'
        expect(editor.lines.find('.line:eq(13)').text()).toBe 'A'
        expect(editor.lines.find('.line:eq(14)').text()).toBe 'B'
        expect(editor.lines.find('.line:eq(15)')).not.toExist()

  describe "path-change event", ->
    it "emits event when buffer's path is changed", ->
      editor = new Editor

      eventHandler = jasmine.createSpy('eventHandler')
      editor.on 'buffer-path-change', eventHandler
      editor.buffer.setPath("moo.text")

    it "emits event when editor receives a new buffer", ->
      eventHandler = jasmine.createSpy('eventHandler')
      editor.on 'buffer-path-change', eventHandler
      editor.setBuffer(new Buffer("something.txt"))
      expect(eventHandler).toHaveBeenCalled()

    it "stops listening to events on previously set buffers", ->
      eventHandler = jasmine.createSpy('eventHandler')
      oldBuffer = editor.buffer
      editor.on 'buffer-path-change', eventHandler

      editor.setBuffer(new Buffer("something.txt"))
      expect(eventHandler).toHaveBeenCalled()

      eventHandler.reset()
      oldBuffer.setPath("bad.txt")
      expect(eventHandler).not.toHaveBeenCalled()

      eventHandler.reset()
      editor.buffer.setPath("new.txt")
      expect(eventHandler).toHaveBeenCalled()

  describe ".loadNextEditSession()", ->
    it "loads the next editor state and wraps to beginning when end is reached", ->
      buffer0 = new Buffer("0")
      buffer1 = new Buffer("1")
      buffer2 = new Buffer("2")
      editor = new Editor(buffer: buffer0)
      editor.setBuffer(buffer1)
      editor.setBuffer(buffer2)

      expect(editor.buffer.path).toBe "2"
      editor.loadNextEditSession()
      expect(editor.buffer.path).toBe "0"
      editor.loadNextEditSession()
      expect(editor.buffer.path).toBe "1"
      editor.loadNextEditSession()
      expect(editor.buffer.path).toBe "2"

  describe ".loadPreviousEditSession()", ->
    it "loads the next editor state and wraps to beginning when end is reached", ->
      buffer0 = new Buffer("0")
      buffer1 = new Buffer("1")
      buffer2 = new Buffer("2")
      editor = new Editor {buffer: buffer0}
      editor.setBuffer(buffer1)
      editor.setBuffer(buffer2)

      expect(editor.buffer.path).toBe "2"
      editor.loadPreviousEditSession()
      expect(editor.buffer.path).toBe "1"
      editor.loadPreviousEditSession()
      expect(editor.buffer.path).toBe "0"
      editor.loadPreviousEditSession()
      expect(editor.buffer.path).toBe "2"

  describe "split methods", ->
    describe "when inside a pane", ->
      fakePane = null
      beforeEach ->
        fakePane = { splitUp: jasmine.createSpy('splitUp').andReturn {} }
        spyOn(editor, 'pane').andReturn(fakePane)

      it "calls the corresponding split method on the containing pane with a copy of the editor", ->
        editor.splitUp()
        expect(fakePane.splitUp).toHaveBeenCalled()
        [editorCopy] = fakePane.splitUp.argsForCall[0]
        expect(editorCopy.serialize()).toEqual editor.serialize()
        expect(editorCopy).not.toBe editor

    describe "when not inside a pane", ->
      it "does not split the editor, but doesn't throw an exception", ->
        editor.splitUp()
        editor.splitDown()
        editor.splitLeft()
        editor.splitRight()