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Added subscript and superscript

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ilyakooo0 2017-10-05 20:58:34 +03:00
parent d40af6524d
commit bbc0a21b4c
1 changed files with 59 additions and 3 deletions
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62
Mathdown/Mathdown/main.swift
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@ -149,7 +149,63 @@ func process(element: Element) -> String {
}
}
func process(lineElement: Substring, withAttributes attributes: String = "", style: ElementStyle = .none) -> Substring {
func extractNextElement(from line: Substring) -> (element: Substring, left: Substring) {
if line.first != "(" {
var i = line.startIndex
var el: Substring = ""
while i < line.endIndex && CharacterSet.alphanumerics.contains(line[i].unicodeScalars.first!) {
el.append(line[i])
i = line.index(after: i)
}
return (el, line[i...])
} else {
var brackets = 0
var i = line.startIndex
var el: Substring = ""
while i < line.endIndex {
switch el[i] {
case "(":
brackets += 1
case ")":
brackets -= 1
default:
break
}
i = line.index(after: i)
if brackets == 0 {
break
}
el.append(el[i])
}
if brackets != 0 {
print("Mismatched brackets")
exit(0)
}
return (el.dropFirst(), line[i...])
}
}
var i = lineElement.startIndex
while i < lineElement.endIndex {
switch lineElement[i] {
case "^":
let parts = extractNextElement(from: lineElement[lineElement.index(after: i)...])
return "<mo mathvariant=\"\(style.rawValue)\" \(attributes)>\(lineElement[..<i].filter({$0 != "\\"}))</mo>" + "<msup><mo></mo><mn>\(parts.element)</mn></msup>" + process(lineElement: parts.left, withAttributes: attributes, style: style)
case "!":
let parts = extractNextElement(from: lineElement[lineElement.index(after: i)...])
return "<mo mathvariant=\"\(style.rawValue)\" \(attributes)>\(lineElement[..<i].filter({$0 != "\\"}))</mo>" + "<mover accent=\"true\"><mrow><mo>\(parts.element)</mo></mrow><mo>_</mo></mover>" + process(lineElement: parts.left, withAttributes: attributes, style: style)
case "\\":
i = lineElement.index(after: i)
case "/":
let parts = extractNextElement(from: lineElement[lineElement.index(after: i)...])
return "<mo mathvariant=\"\(style.rawValue)\" \(attributes)>\(lineElement[..<i].filter({$0 != "\\"}))</mo>" + "<msub><mo></mo><mn>\(parts.element)</mn></msub>" + process(lineElement: parts.left, withAttributes: attributes, style: style)
default:
break
}
i = lineElement.index(after: i)
}
return Substring("<mo mathvariant=\"\(style.rawValue)\" \(attributes)>\(lineElement.filter({$0 != "\\"}))</mo>")
}
func process(line: Substring) {
out.append("<mtr>")
for element in line.split(
@ -159,7 +215,7 @@ func process(element: Element) -> String {
out.append("<mtd><mspace height=\"0.8em\"/></mtd>")
default:
let eStyle = element.style
out.append("<mtd><mn mathvariant=\"\(eStyle.rawValue)\" height=\"0.8em\">\(element.trimmingStyleCharecters())</mn></mtd>")
out.append("<mtd>\(process(lineElement: Substring(element.trimmingStyleCharecters()), withAttributes: "height=\"0.8em\"", style: eStyle))</mtd>")
}
}
out.append("</mtr>")
@ -223,7 +279,7 @@ func process(element: Element) -> String {
case let l where arrows.contains(l.first!.unicodeScalars.first!):
out.append("<mtr><mtd><mo>\(line)</mo></mtd></mtr>")
default:
out.append("<mtr><mtd>\(small ? "<mstyle scriptlevel=\"1\">" : "")<mo>\(line)</mo>\(small ? "</mstyle>" : "")</mtd></mtr>")
out.append("<mtr><mtd>\(small ? "<mstyle scriptlevel=\"1\">" : "")\(process(lineElement: Substring(line)))\(small ? "</mstyle>" : "")</mtd></mtr>")
}
}
first = false