2011-07-22 18:34:32 +04:00
|
|
|
|
# coding: utf8
|
2012-03-22 02:19:27 +04:00
|
|
|
|
"""
|
|
|
|
|
weasyprint.layout.inline
|
|
|
|
|
------------------------
|
2011-07-22 18:34:32 +04:00
|
|
|
|
|
2012-03-22 02:19:27 +04:00
|
|
|
|
Line breaking and layout for inline-level boxes.
|
2011-07-22 18:34:32 +04:00
|
|
|
|
|
2012-03-22 02:19:27 +04:00
|
|
|
|
:copyright: Copyright 2011-2012 Simon Sapin and contributors, see AUTHORS.
|
|
|
|
|
:license: BSD, see LICENSE for details.
|
2011-08-24 12:48:42 +04:00
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
|
2012-02-17 21:49:58 +04:00
|
|
|
|
from __future__ import division, unicode_literals
|
2011-12-12 12:46:34 +04:00
|
|
|
|
|
2011-09-30 13:54:56 +04:00
|
|
|
|
import cairo
|
|
|
|
|
|
2011-08-22 17:37:10 +04:00
|
|
|
|
from .markers import image_marker_layout
|
2011-10-21 14:22:19 +04:00
|
|
|
|
from .percentages import resolve_percentages, resolve_one_percentage
|
2011-09-27 16:48:52 +04:00
|
|
|
|
from ..text import TextFragment
|
2011-08-22 17:37:10 +04:00
|
|
|
|
from ..formatting_structure import boxes
|
2012-02-01 19:13:47 +04:00
|
|
|
|
from ..css.computed_values import used_line_height
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
|
|
|
|
|
2012-03-14 22:33:24 +04:00
|
|
|
|
def iter_line_boxes(document, box, position_y, skip_stack,
|
|
|
|
|
containing_block, device_size):
|
|
|
|
|
"""Return an iterator of ``(line, resume_at)``.
|
2011-10-17 18:34:33 +04:00
|
|
|
|
|
|
|
|
|
``line`` is a laid-out LineBox with as much content as possible that
|
|
|
|
|
fits in the available width.
|
|
|
|
|
|
|
|
|
|
:param linebox: a non-laid-out :class:`LineBox`
|
|
|
|
|
:param position_y: vertical top position of the line box on the page
|
|
|
|
|
:param skip_stack: ``None`` to start at the beginning of ``linebox``,
|
|
|
|
|
or a ``resume_at`` value to continue just after an
|
|
|
|
|
already laid-out line.
|
|
|
|
|
:param containing_block: Containing block of the line box:
|
|
|
|
|
a :class:`BlockContainerBox`
|
|
|
|
|
:param device_size: ``(width, height)`` of the current page.
|
|
|
|
|
|
|
|
|
|
"""
|
2012-03-14 22:33:24 +04:00
|
|
|
|
while 1:
|
|
|
|
|
line, resume_at = get_next_linebox(
|
|
|
|
|
document, box, position_y, skip_stack,
|
|
|
|
|
containing_block, device_size)
|
|
|
|
|
if line is None:
|
|
|
|
|
return
|
|
|
|
|
yield line, resume_at
|
|
|
|
|
if resume_at is None:
|
|
|
|
|
return
|
|
|
|
|
skip_stack = resume_at
|
|
|
|
|
position_y += line.height
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def get_next_linebox(document, linebox, position_y, skip_stack,
|
|
|
|
|
containing_block, device_size):
|
|
|
|
|
"""Return ``(line, resume_at)``."""
|
2011-09-30 21:04:05 +04:00
|
|
|
|
position_x = linebox.position_x
|
2011-10-17 20:40:18 +04:00
|
|
|
|
max_x = position_x + containing_block.width
|
2011-10-21 14:22:19 +04:00
|
|
|
|
if skip_stack is None:
|
|
|
|
|
# text-indent only at the start of the first line
|
|
|
|
|
# Other percentages (margins, width, ...) do not apply.
|
|
|
|
|
resolve_one_percentage(linebox, 'text_indent', containing_block.width)
|
|
|
|
|
position_x += linebox.text_indent
|
2011-10-05 15:01:44 +04:00
|
|
|
|
|
|
|
|
|
skip_stack = skip_first_whitespace(linebox, skip_stack)
|
|
|
|
|
if skip_stack == 'continue':
|
|
|
|
|
return None, None
|
|
|
|
|
|
2011-11-29 13:37:59 +04:00
|
|
|
|
resolve_percentages(linebox, containing_block)
|
2011-10-05 15:01:44 +04:00
|
|
|
|
line, resume_at, preserved_line_break = split_inline_box(
|
2011-12-02 18:31:23 +04:00
|
|
|
|
document, linebox, position_x, max_x, skip_stack, containing_block,
|
|
|
|
|
device_size)
|
2011-10-05 15:01:44 +04:00
|
|
|
|
|
2011-12-02 18:31:23 +04:00
|
|
|
|
remove_last_whitespace(document, line)
|
2011-10-05 15:01:44 +04:00
|
|
|
|
|
2011-11-23 21:23:15 +04:00
|
|
|
|
bottom, top = inline_box_verticality(line, baseline_y=0)
|
2012-02-01 19:13:47 +04:00
|
|
|
|
last = resume_at is None or preserved_line_break
|
|
|
|
|
offset_x = text_align(document, line, containing_block, last)
|
2011-10-19 17:14:43 +04:00
|
|
|
|
if bottom is None:
|
|
|
|
|
# No children at all
|
|
|
|
|
line.position_y = position_y
|
2011-10-20 20:37:44 +04:00
|
|
|
|
offset_y = 0
|
2011-10-19 17:14:43 +04:00
|
|
|
|
if preserved_line_break:
|
|
|
|
|
# Only the strut.
|
2011-11-24 20:56:05 +04:00
|
|
|
|
line.baseline = line.margin_top
|
2011-10-19 17:14:43 +04:00
|
|
|
|
line.height += line.margin_top + line.margin_bottom
|
|
|
|
|
else:
|
|
|
|
|
line.height = 0
|
2011-11-24 20:56:05 +04:00
|
|
|
|
line.baseline = 0
|
2011-10-05 15:01:44 +04:00
|
|
|
|
else:
|
2011-11-29 20:19:43 +04:00
|
|
|
|
assert top is not None
|
2011-11-24 20:56:05 +04:00
|
|
|
|
line.baseline = -top
|
2011-10-19 17:14:43 +04:00
|
|
|
|
line.position_y = top
|
|
|
|
|
line.height = bottom - top
|
2011-10-20 20:37:44 +04:00
|
|
|
|
offset_y = position_y - top
|
2011-10-19 17:14:43 +04:00
|
|
|
|
line.margin_top = 0
|
|
|
|
|
line.margin_bottom = 0
|
2011-10-20 20:37:44 +04:00
|
|
|
|
if offset_x != 0 or offset_y != 0:
|
|
|
|
|
# This also translates children
|
|
|
|
|
line.translate(offset_x, offset_y)
|
2011-10-19 17:14:43 +04:00
|
|
|
|
return line, resume_at
|
2011-10-05 15:01:44 +04:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def skip_first_whitespace(box, skip_stack):
|
|
|
|
|
"""Return the ``skip_stack`` to start just after the remove spaces
|
|
|
|
|
at the beginning of the line.
|
|
|
|
|
|
|
|
|
|
See http://www.w3.org/TR/CSS21/text.html#white-space-model
|
|
|
|
|
"""
|
|
|
|
|
if skip_stack is None:
|
|
|
|
|
index = 0
|
|
|
|
|
next_skip_stack = None
|
|
|
|
|
else:
|
|
|
|
|
index, next_skip_stack = skip_stack
|
|
|
|
|
|
|
|
|
|
if isinstance(box, boxes.TextBox):
|
|
|
|
|
assert next_skip_stack is None
|
2011-10-08 16:41:12 +04:00
|
|
|
|
white_space = box.style.white_space
|
2011-11-08 16:09:19 +04:00
|
|
|
|
length = len(box.text)
|
2011-10-05 15:01:44 +04:00
|
|
|
|
if index == length:
|
|
|
|
|
# Starting a the end of the TextBox, no text to see: Continue
|
|
|
|
|
return 'continue'
|
|
|
|
|
if white_space in ('normal', 'nowrap', 'pre-line'):
|
2011-11-08 16:09:19 +04:00
|
|
|
|
while index < length and box.text[index] == ' ':
|
2011-10-05 15:01:44 +04:00
|
|
|
|
index += 1
|
|
|
|
|
return index, None
|
|
|
|
|
|
|
|
|
|
if isinstance(box, (boxes.LineBox, boxes.InlineBox)):
|
2011-10-11 14:09:37 +04:00
|
|
|
|
if index == 0 and not box.children:
|
|
|
|
|
return None
|
2011-10-05 15:01:44 +04:00
|
|
|
|
result = skip_first_whitespace(box.children[index], next_skip_stack)
|
|
|
|
|
if result == 'continue':
|
|
|
|
|
index += 1
|
|
|
|
|
if index >= len(box.children):
|
|
|
|
|
return 'continue'
|
|
|
|
|
result = skip_first_whitespace(box.children[index], None)
|
|
|
|
|
return index, result
|
|
|
|
|
|
|
|
|
|
assert skip_stack is None, 'unexpected skip inside %s' % box
|
|
|
|
|
return None
|
|
|
|
|
|
|
|
|
|
|
2011-12-02 18:31:23 +04:00
|
|
|
|
def remove_last_whitespace(document, box):
|
2011-10-20 20:37:21 +04:00
|
|
|
|
"""Remove in place space characters at the end of a line.
|
|
|
|
|
|
|
|
|
|
This also reduces the width of the inline parents of the modified text.
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
ancestors = []
|
2011-10-05 15:01:44 +04:00
|
|
|
|
while isinstance(box, (boxes.LineBox, boxes.InlineBox)):
|
2011-10-20 20:37:21 +04:00
|
|
|
|
ancestors.append(box)
|
2011-10-05 15:01:44 +04:00
|
|
|
|
if not box.children:
|
|
|
|
|
return
|
|
|
|
|
box = box.children[-1]
|
2011-10-20 20:37:21 +04:00
|
|
|
|
if not (isinstance(box, boxes.TextBox) and
|
|
|
|
|
box.style.white_space in ('normal', 'nowrap', 'pre-line')):
|
|
|
|
|
return
|
2011-11-08 16:09:19 +04:00
|
|
|
|
new_text = box.text.rstrip(' ')
|
2011-10-26 19:22:49 +04:00
|
|
|
|
if new_text:
|
2011-11-08 16:09:19 +04:00
|
|
|
|
if len(new_text) == len(box.text):
|
2011-10-26 19:22:49 +04:00
|
|
|
|
return
|
2011-12-02 18:31:23 +04:00
|
|
|
|
new_box, resume, _ = split_text_box(document, box, box.width * 2, 0)
|
2011-10-26 19:22:49 +04:00
|
|
|
|
assert new_box is not None
|
|
|
|
|
assert resume is None
|
|
|
|
|
space_width = box.width - new_box.width
|
|
|
|
|
box.width = new_box.width
|
|
|
|
|
box.show_line = new_box.show_line
|
|
|
|
|
else:
|
|
|
|
|
space_width = box.width
|
|
|
|
|
box.width = 0
|
|
|
|
|
box.show_line = lambda x: x # No-op
|
2011-11-08 16:09:19 +04:00
|
|
|
|
box.text = new_text
|
2012-01-26 14:33:49 +04:00
|
|
|
|
|
2011-10-20 20:37:21 +04:00
|
|
|
|
for ancestor in ancestors:
|
|
|
|
|
ancestor.width -= space_width
|
2011-08-22 20:20:23 +04:00
|
|
|
|
|
2011-10-06 14:12:39 +04:00
|
|
|
|
# TODO: All tabs (U+0009) are rendered as a horizontal shift that
|
|
|
|
|
# lines up the start edge of the next glyph with the next tab stop.
|
|
|
|
|
# Tab stops occur at points that are multiples of 8 times the width
|
|
|
|
|
# of a space (U+0020) rendered in the block's font from the block's
|
|
|
|
|
# starting content edge.
|
|
|
|
|
|
|
|
|
|
# TODO: If spaces (U+0020) or tabs (U+0009) at the end of a line have
|
|
|
|
|
# 'white-space' set to 'pre-wrap', UAs may visually collapse them.
|
|
|
|
|
|
2011-09-30 19:24:44 +04:00
|
|
|
|
|
2011-10-06 19:47:04 +04:00
|
|
|
|
def inline_replaced_box_layout(box, containing_block, device_size):
|
2011-08-24 12:48:42 +04:00
|
|
|
|
"""Lay out an inline :class:`boxes.ReplacedBox` ``box``."""
|
2011-08-22 17:37:10 +04:00
|
|
|
|
assert isinstance(box, boxes.ReplacedBox)
|
|
|
|
|
|
2011-08-26 17:52:37 +04:00
|
|
|
|
# Compute width:
|
|
|
|
|
# http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width
|
2011-08-22 17:37:10 +04:00
|
|
|
|
if box.margin_left == 'auto':
|
|
|
|
|
box.margin_left = 0
|
|
|
|
|
if box.margin_right == 'auto':
|
|
|
|
|
box.margin_right = 0
|
2011-10-06 17:36:19 +04:00
|
|
|
|
replaced_box_width(box, device_size)
|
2011-08-22 17:37:10 +04:00
|
|
|
|
|
2011-08-26 18:16:40 +04:00
|
|
|
|
# Compute height
|
|
|
|
|
# http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-height
|
|
|
|
|
if box.margin_top == 'auto':
|
|
|
|
|
box.margin_top = 0
|
|
|
|
|
if box.margin_bottom == 'auto':
|
|
|
|
|
box.margin_bottom = 0
|
2011-10-06 17:36:19 +04:00
|
|
|
|
replaced_box_height(box, device_size)
|
2011-08-26 18:16:40 +04:00
|
|
|
|
|
|
|
|
|
|
2011-10-06 17:36:19 +04:00
|
|
|
|
def replaced_box_width(box, device_size):
|
2011-08-26 18:16:40 +04:00
|
|
|
|
"""
|
|
|
|
|
Compute and set the used width for replaced boxes (inline- or block-level)
|
|
|
|
|
"""
|
2011-12-08 21:11:32 +04:00
|
|
|
|
_surface, intrinsic_width, intrinsic_height = box.replacement
|
|
|
|
|
intrinsic_ratio = intrinsic_width / intrinsic_height
|
2011-08-22 17:37:10 +04:00
|
|
|
|
|
2011-08-26 17:52:37 +04:00
|
|
|
|
if box.height == 'auto' and box.width == 'auto':
|
2011-08-22 17:37:10 +04:00
|
|
|
|
if intrinsic_width is not None:
|
|
|
|
|
box.width = intrinsic_width
|
|
|
|
|
elif intrinsic_height is not None and intrinsic_ratio is not None:
|
|
|
|
|
box.width = intrinsic_ratio * intrinsic_height
|
2011-08-26 17:52:37 +04:00
|
|
|
|
elif box.height != 'auto' and intrinsic_ratio is not None:
|
|
|
|
|
box.width = intrinsic_ratio * box.height
|
|
|
|
|
elif intrinsic_ratio is not None:
|
|
|
|
|
pass
|
2011-10-17 18:34:33 +04:00
|
|
|
|
# TODO: Intrinsic ratio only: undefined in CSS 2.1.
|
2011-08-26 17:52:37 +04:00
|
|
|
|
# " It is suggested that, if the containing block's width does not
|
|
|
|
|
# itself depend on the replaced element's width, then the used
|
|
|
|
|
# value of 'width' is calculated from the constraint equation
|
|
|
|
|
# used for block-level, non-replaced elements in normal flow. "
|
|
|
|
|
|
|
|
|
|
# Still no value
|
|
|
|
|
if box.width == 'auto':
|
|
|
|
|
if intrinsic_width is not None:
|
|
|
|
|
box.width = intrinsic_width
|
2011-10-17 18:34:33 +04:00
|
|
|
|
else:
|
2011-08-22 17:37:10 +04:00
|
|
|
|
# Then the used value of 'width' becomes 300px. If 300px is too
|
|
|
|
|
# wide to fit the device, UAs should use the width of the largest
|
|
|
|
|
# rectangle that has a 2:1 ratio and fits the device instead.
|
2011-10-06 17:36:19 +04:00
|
|
|
|
device_width, _device_height = device_size
|
2011-08-26 17:52:37 +04:00
|
|
|
|
box.width = min(300, device_width)
|
2011-08-22 17:37:10 +04:00
|
|
|
|
|
2011-08-26 18:16:40 +04:00
|
|
|
|
|
2011-10-06 17:36:19 +04:00
|
|
|
|
def replaced_box_height(box, device_size):
|
2011-08-26 18:16:40 +04:00
|
|
|
|
"""
|
|
|
|
|
Compute and set the used height for replaced boxes (inline- or block-level)
|
|
|
|
|
"""
|
2011-12-08 21:11:32 +04:00
|
|
|
|
_surface, intrinsic_width, intrinsic_height = box.replacement
|
|
|
|
|
intrinsic_ratio = intrinsic_width / intrinsic_height
|
2011-08-22 17:37:10 +04:00
|
|
|
|
|
|
|
|
|
if box.height == 'auto' and box.width == 'auto':
|
|
|
|
|
if intrinsic_height is not None:
|
|
|
|
|
box.height = intrinsic_height
|
|
|
|
|
elif intrinsic_ratio is not None and box.height == 'auto':
|
|
|
|
|
box.height = box.width / intrinsic_ratio
|
2011-08-26 17:52:37 +04:00
|
|
|
|
elif box.height == 'auto' and intrinsic_height is not None:
|
|
|
|
|
box.height = intrinsic_height
|
|
|
|
|
elif box.height == 'auto':
|
2011-10-06 17:36:19 +04:00
|
|
|
|
device_width, _device_height = device_size
|
2011-08-26 17:52:37 +04:00
|
|
|
|
box.height = min(150, device_width / 2)
|
2011-08-22 17:37:10 +04:00
|
|
|
|
|
2011-08-26 18:16:40 +04:00
|
|
|
|
|
2011-10-19 17:14:43 +04:00
|
|
|
|
def atomic_box(box, containing_block, device_size):
|
2011-08-24 12:48:42 +04:00
|
|
|
|
"""Compute the width and the height of the atomic ``box``."""
|
2011-08-22 13:38:54 +04:00
|
|
|
|
if isinstance(box, boxes.ReplacedBox):
|
2011-11-08 18:24:31 +04:00
|
|
|
|
if getattr(box, 'is_list_marker', False):
|
|
|
|
|
image_marker_layout(box)
|
|
|
|
|
else:
|
|
|
|
|
inline_replaced_box_layout(box, containing_block, device_size)
|
2012-04-02 16:45:44 +04:00
|
|
|
|
else: # pragma: no cover
|
2011-08-22 13:38:54 +04:00
|
|
|
|
raise TypeError('Layout for %s not handled yet' % type(box).__name__)
|
2011-10-19 17:14:43 +04:00
|
|
|
|
return box
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
|
|
|
|
|
2011-12-02 18:31:23 +04:00
|
|
|
|
def split_inline_level(document, box, position_x, max_x, skip_stack,
|
|
|
|
|
containing_block, device_size):
|
2011-09-30 21:04:05 +04:00
|
|
|
|
"""Fit as much content as possible from an inline-level box in a width.
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-09-30 21:04:05 +04:00
|
|
|
|
Return ``(new_box, resume_at)``. ``resume_at`` is ``None`` if all of the
|
|
|
|
|
content fits. Otherwise it can be passed as a ``skip_stack`` parameter
|
|
|
|
|
to resume where we left off.
|
2011-08-24 20:06:25 +04:00
|
|
|
|
|
2011-09-30 21:04:05 +04:00
|
|
|
|
``new_box`` is non-empty (unless the box is empty) and as big as possible
|
|
|
|
|
while being narrower than ``available_width``, if possible (may overflow
|
|
|
|
|
is no split is possible.)
|
2011-08-24 20:06:25 +04:00
|
|
|
|
|
|
|
|
|
"""
|
2011-11-29 13:37:59 +04:00
|
|
|
|
resolve_percentages(box, containing_block)
|
2011-08-24 20:06:25 +04:00
|
|
|
|
if isinstance(box, boxes.TextBox):
|
2011-10-20 20:37:21 +04:00
|
|
|
|
box.position_x = position_x
|
2011-10-05 15:01:44 +04:00
|
|
|
|
if skip_stack is None:
|
|
|
|
|
skip = 0
|
|
|
|
|
else:
|
|
|
|
|
skip, skip_stack = skip_stack
|
|
|
|
|
skip = skip or 0
|
|
|
|
|
assert skip_stack is None
|
|
|
|
|
|
|
|
|
|
new_box, skip, preserved_line_break = split_text_box(
|
2011-12-02 18:31:23 +04:00
|
|
|
|
document, box, max_x - position_x, skip)
|
2011-10-05 15:01:44 +04:00
|
|
|
|
|
|
|
|
|
if skip is None:
|
|
|
|
|
resume_at = None
|
|
|
|
|
else:
|
|
|
|
|
resume_at = (skip, None)
|
2011-08-24 20:06:25 +04:00
|
|
|
|
elif isinstance(box, boxes.InlineBox):
|
2011-08-26 11:58:30 +04:00
|
|
|
|
if box.margin_left == 'auto':
|
|
|
|
|
box.margin_left = 0
|
|
|
|
|
if box.margin_right == 'auto':
|
|
|
|
|
box.margin_right = 0
|
2011-10-05 15:01:44 +04:00
|
|
|
|
new_box, resume_at, preserved_line_break = split_inline_box(
|
2011-12-02 18:31:23 +04:00
|
|
|
|
document, box, position_x, max_x, skip_stack, containing_block,
|
|
|
|
|
device_size)
|
2011-08-24 20:06:25 +04:00
|
|
|
|
elif isinstance(box, boxes.AtomicInlineLevelBox):
|
2011-10-19 17:14:43 +04:00
|
|
|
|
new_box = atomic_box(box, containing_block, device_size)
|
|
|
|
|
new_box.position_x = position_x
|
|
|
|
|
new_box.baseline = new_box.margin_height()
|
2011-09-30 21:04:05 +04:00
|
|
|
|
resume_at = None
|
2011-10-05 15:01:44 +04:00
|
|
|
|
preserved_line_break = False
|
2011-09-30 21:04:05 +04:00
|
|
|
|
#else: unexpected box type here
|
2011-10-05 15:01:44 +04:00
|
|
|
|
return new_box, resume_at, preserved_line_break
|
2011-08-24 12:48:42 +04:00
|
|
|
|
|
|
|
|
|
|
2011-12-02 18:31:23 +04:00
|
|
|
|
def split_inline_box(document, box, position_x, max_x, skip_stack,
|
2011-10-17 20:40:18 +04:00
|
|
|
|
containing_block, device_size):
|
2011-09-30 21:04:05 +04:00
|
|
|
|
"""Same behavior as split_inline_level."""
|
2011-10-21 14:22:19 +04:00
|
|
|
|
initial_position_x = position_x
|
2011-10-19 17:14:43 +04:00
|
|
|
|
assert isinstance(box, (boxes.LineBox, boxes.InlineBox))
|
|
|
|
|
left_spacing = (box.padding_left + box.margin_left +
|
2011-12-30 20:19:02 +04:00
|
|
|
|
box.border_left_width)
|
2011-10-19 17:14:43 +04:00
|
|
|
|
right_spacing = (box.padding_right + box.margin_right +
|
2011-12-30 20:19:02 +04:00
|
|
|
|
box.border_right_width)
|
2011-10-17 20:40:18 +04:00
|
|
|
|
position_x += left_spacing
|
2011-10-19 17:14:43 +04:00
|
|
|
|
content_box_left = position_x
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-10-03 20:57:26 +04:00
|
|
|
|
children = []
|
2011-10-05 15:01:44 +04:00
|
|
|
|
preserved_line_break = False
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-09-30 21:04:05 +04:00
|
|
|
|
if skip_stack is None:
|
|
|
|
|
skip = 0
|
|
|
|
|
else:
|
|
|
|
|
skip, skip_stack = skip_stack
|
|
|
|
|
|
2011-10-19 17:14:43 +04:00
|
|
|
|
for index, child in box.enumerate_skip(skip):
|
|
|
|
|
assert child.is_in_normal_flow(), '"Abnormal" flow not supported yet.'
|
2011-10-05 15:01:44 +04:00
|
|
|
|
new_child, resume_at, preserved = split_inline_level(
|
2011-12-02 18:31:23 +04:00
|
|
|
|
document, child, position_x, max_x, skip_stack,
|
2011-10-17 20:40:18 +04:00
|
|
|
|
containing_block, device_size)
|
2011-09-30 21:04:05 +04:00
|
|
|
|
skip_stack = None
|
2011-10-05 15:01:44 +04:00
|
|
|
|
if preserved:
|
|
|
|
|
preserved_line_break = True
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-08-24 20:06:25 +04:00
|
|
|
|
# TODO: this is non-optimal when last_child is True and
|
2011-08-24 19:47:16 +04:00
|
|
|
|
# width <= remaining_width < width + right_spacing
|
|
|
|
|
# with
|
|
|
|
|
# width = part1.margin_width()
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-09-30 21:04:05 +04:00
|
|
|
|
# TODO: on the last child, take care of right_spacing
|
2011-08-26 18:21:46 +04:00
|
|
|
|
|
2011-10-05 15:01:44 +04:00
|
|
|
|
if new_child is None:
|
|
|
|
|
# may be None where we would have an empty TextBox
|
|
|
|
|
assert isinstance(child, boxes.TextBox)
|
2011-08-17 16:01:06 +04:00
|
|
|
|
else:
|
2011-10-05 15:01:44 +04:00
|
|
|
|
margin_width = new_child.margin_width()
|
2011-10-17 20:40:18 +04:00
|
|
|
|
new_position_x = position_x + margin_width
|
2011-10-05 15:01:44 +04:00
|
|
|
|
|
2011-10-17 20:40:18 +04:00
|
|
|
|
if (new_position_x > max_x and children):
|
2011-10-05 15:01:44 +04:00
|
|
|
|
# too wide, and the inline is non-empty:
|
|
|
|
|
# put child entirely on the next line.
|
|
|
|
|
resume_at = (index, None)
|
|
|
|
|
break
|
|
|
|
|
else:
|
2011-10-17 20:40:18 +04:00
|
|
|
|
position_x = new_position_x
|
2011-10-05 15:01:44 +04:00
|
|
|
|
children.append(new_child)
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-09-30 21:04:05 +04:00
|
|
|
|
if resume_at is not None:
|
|
|
|
|
resume_at = (index, resume_at)
|
|
|
|
|
break
|
|
|
|
|
else:
|
|
|
|
|
resume_at = None
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-10-19 17:14:43 +04:00
|
|
|
|
new_box = box.copy_with_children(children)
|
2012-02-03 03:43:18 +04:00
|
|
|
|
if isinstance(box, boxes.LineBox):
|
|
|
|
|
# Line boxes already have a position_x which may not be the same
|
|
|
|
|
# as content_box_left when text-indent is non-zero.
|
|
|
|
|
# This is important for justified text.
|
|
|
|
|
new_box.width = position_x - new_box.position_x
|
|
|
|
|
else:
|
|
|
|
|
new_box.position_x = initial_position_x
|
|
|
|
|
new_box.width = position_x - content_box_left
|
2011-10-19 17:14:43 +04:00
|
|
|
|
|
|
|
|
|
# Create a "strut":
|
|
|
|
|
# http://www.w3.org/TR/CSS21/visudet.html#strut
|
|
|
|
|
# TODO: cache these results for a given set of styles?
|
|
|
|
|
fragment = TextFragment(
|
2012-02-17 21:49:58 +04:00
|
|
|
|
'', box.style, cairo.Context(document.surface))
|
2011-10-19 17:14:43 +04:00
|
|
|
|
_, _, _, height, baseline, _ = fragment.split_first_line()
|
2011-12-16 20:31:37 +04:00
|
|
|
|
leading = used_line_height(box.style) - height
|
2011-10-19 17:14:43 +04:00
|
|
|
|
half_leading = leading / 2.
|
|
|
|
|
# Set margins to the half leading but also compensate for borders and
|
|
|
|
|
# paddings. We want margin_height() == line_height
|
2011-12-30 20:19:02 +04:00
|
|
|
|
new_box.margin_top = (half_leading - new_box.border_top_width -
|
2011-10-19 17:14:43 +04:00
|
|
|
|
new_box.padding_bottom)
|
2011-12-30 20:19:02 +04:00
|
|
|
|
new_box.margin_bottom = (half_leading - new_box.border_bottom_width -
|
2011-10-19 17:14:43 +04:00
|
|
|
|
new_box.padding_bottom)
|
|
|
|
|
# form the top of the content box
|
|
|
|
|
new_box.baseline = baseline
|
|
|
|
|
# form the top of the margin box
|
|
|
|
|
new_box.baseline += half_leading
|
|
|
|
|
new_box.height = height
|
|
|
|
|
|
2011-10-04 17:22:42 +04:00
|
|
|
|
if resume_at is not None:
|
|
|
|
|
# There is a line break inside this box.
|
2011-10-19 17:14:43 +04:00
|
|
|
|
box.reset_spacing('left')
|
|
|
|
|
new_box.reset_spacing('right')
|
|
|
|
|
return new_box, resume_at, preserved_line_break
|
2011-08-24 12:48:42 +04:00
|
|
|
|
|
|
|
|
|
|
2011-12-02 18:31:23 +04:00
|
|
|
|
def split_text_box(document, box, available_width, skip):
|
2011-09-30 21:04:05 +04:00
|
|
|
|
"""Keep as much text as possible from a TextBox in a limitied width.
|
2011-10-19 17:14:43 +04:00
|
|
|
|
Try not to overflow but always have some text in ``new_box``
|
2011-08-24 12:48:42 +04:00
|
|
|
|
|
2011-10-19 17:14:43 +04:00
|
|
|
|
Return ``(new_box, skip)``. ``skip`` is the number of UTF-8 bytes
|
2011-09-30 21:04:05 +04:00
|
|
|
|
to skip form the start of the TextBox for the next line, or ``None``
|
|
|
|
|
if all of the text fits.
|
2011-08-24 12:48:42 +04:00
|
|
|
|
|
2011-09-30 21:04:05 +04:00
|
|
|
|
Also break an preserved whitespace.
|
2011-08-24 12:48:42 +04:00
|
|
|
|
|
2011-08-17 16:01:06 +04:00
|
|
|
|
"""
|
2011-10-19 17:14:43 +04:00
|
|
|
|
assert isinstance(box, boxes.TextBox)
|
|
|
|
|
font_size = box.style.font_size
|
2011-11-08 16:09:19 +04:00
|
|
|
|
text = box.text[skip:]
|
2011-12-28 18:34:30 +04:00
|
|
|
|
if font_size == 0 or not text:
|
2011-10-05 15:01:44 +04:00
|
|
|
|
return None, None, False
|
2011-11-08 16:09:19 +04:00
|
|
|
|
fragment = TextFragment(text, box.style,
|
2012-02-01 19:13:47 +04:00
|
|
|
|
cairo.Context(document.surface), available_width)
|
2011-10-08 20:31:15 +04:00
|
|
|
|
|
2011-11-08 16:09:19 +04:00
|
|
|
|
# XXX ``resume_at`` is an index in UTF-8 bytes, not unicode codepoints.
|
2011-10-08 22:38:33 +04:00
|
|
|
|
show_line, length, width, height, baseline, resume_at = \
|
|
|
|
|
fragment.split_first_line()
|
2011-10-08 20:31:15 +04:00
|
|
|
|
|
2011-11-08 16:09:19 +04:00
|
|
|
|
# Convert ``length`` and ``resume_at`` from UTF-8 indexes in text
|
|
|
|
|
# to Unicode indexes.
|
|
|
|
|
# No need to encode what’s after resume_at (if set) or length (if
|
|
|
|
|
# resume_at is not set). One code point is one or more byte, so
|
|
|
|
|
# UTF-8 indexes are always bigger or equal to Unicode indexes.
|
|
|
|
|
partial_text = text[:resume_at or length]
|
|
|
|
|
utf8_text = partial_text.encode('utf8')
|
|
|
|
|
new_text = utf8_text[:length].decode('utf8')
|
|
|
|
|
new_length = len(new_text)
|
|
|
|
|
if resume_at is not None:
|
|
|
|
|
between = utf8_text[length:resume_at].decode('utf8')
|
|
|
|
|
resume_at = new_length + len(between)
|
|
|
|
|
length = new_length
|
|
|
|
|
|
2011-10-08 20:31:15 +04:00
|
|
|
|
if length > 0:
|
2011-11-08 16:09:19 +04:00
|
|
|
|
box = box.copy_with_text(new_text)
|
2011-10-19 17:14:43 +04:00
|
|
|
|
box.width = width
|
|
|
|
|
box.show_line = show_line
|
|
|
|
|
# "The height of the content area should be based on the font,
|
|
|
|
|
# but this specification does not specify how."
|
|
|
|
|
# http://www.w3.org/TR/CSS21/visudet.html#inline-non-replaced
|
|
|
|
|
# We trust Pango and use the height of the LayoutLine.
|
|
|
|
|
# It is based on font_size (slightly larger), but I’m not sure how.
|
|
|
|
|
# TODO: investigate this
|
|
|
|
|
box.height = height
|
|
|
|
|
# "only the 'line-height' is used when calculating the height
|
|
|
|
|
# of the line box."
|
|
|
|
|
# Set margins so that margin_height() == line_height
|
2011-12-16 20:31:37 +04:00
|
|
|
|
leading = used_line_height(box.style) - height
|
2011-10-19 17:14:43 +04:00
|
|
|
|
half_leading = leading / 2.
|
|
|
|
|
box.margin_top = half_leading
|
|
|
|
|
box.margin_bottom = half_leading
|
|
|
|
|
# form the top of the content box
|
|
|
|
|
box.baseline = baseline
|
|
|
|
|
# form the top of the margin box
|
2011-12-30 20:19:02 +04:00
|
|
|
|
box.baseline += box.margin_top + box.border_top_width + box.padding_top
|
2011-10-08 20:31:15 +04:00
|
|
|
|
else:
|
2011-10-19 17:14:43 +04:00
|
|
|
|
box = None
|
2011-10-08 20:31:15 +04:00
|
|
|
|
|
|
|
|
|
if resume_at is None:
|
|
|
|
|
preserved_line_break = False
|
2011-10-05 15:01:44 +04:00
|
|
|
|
else:
|
2011-10-08 20:31:15 +04:00
|
|
|
|
preserved_line_break = (length != resume_at)
|
|
|
|
|
if preserved_line_break:
|
2011-11-08 16:09:19 +04:00
|
|
|
|
assert between == '\n', ('Got %r between two lines. '
|
2011-10-08 20:31:15 +04:00
|
|
|
|
'Expected nothing or a preserved line break' % (between,))
|
|
|
|
|
resume_at += skip
|
|
|
|
|
|
2011-10-19 17:14:43 +04:00
|
|
|
|
return box, resume_at, preserved_line_break
|
|
|
|
|
|
|
|
|
|
|
2011-11-23 21:23:15 +04:00
|
|
|
|
def inline_box_verticality(box, baseline_y):
|
2011-10-19 17:14:43 +04:00
|
|
|
|
"""Handle ``vertical-align`` within an :class:`InlineBox`.
|
|
|
|
|
|
2011-11-23 21:23:15 +04:00
|
|
|
|
Place all boxes vertically assuming that the baseline of ``box``
|
|
|
|
|
is at `y = baseline_y`.
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-10-19 17:14:43 +04:00
|
|
|
|
Return ``(max_y, min_y)``, the maximum and minimum vertical position
|
|
|
|
|
of margin boxes.
|
2011-08-17 16:01:06 +04:00
|
|
|
|
|
2011-10-19 17:14:43 +04:00
|
|
|
|
"""
|
|
|
|
|
max_y = None
|
|
|
|
|
min_y = None
|
2011-08-19 12:39:31 +04:00
|
|
|
|
for child in box.children:
|
2011-11-23 21:23:33 +04:00
|
|
|
|
vertical_align = child.style.vertical_align
|
|
|
|
|
if vertical_align == 'baseline':
|
|
|
|
|
child_baseline_y = baseline_y
|
|
|
|
|
elif vertical_align == 'middle':
|
|
|
|
|
# TODO: find ex from font metrics
|
|
|
|
|
one_ex = box.style.font_size * 0.5
|
|
|
|
|
top = baseline_y - (one_ex + child.margin_height()) / 2.
|
|
|
|
|
child_baseline_y = top + child.baseline
|
2011-11-24 15:40:52 +04:00
|
|
|
|
# TODO: actually implement vertical-align: top and bottom
|
|
|
|
|
elif vertical_align in ('text-top', 'top'):
|
2011-11-24 14:00:33 +04:00
|
|
|
|
# align top with the top of the parent’s content area
|
|
|
|
|
top = (baseline_y - box.baseline + box.margin_top +
|
2011-12-30 20:19:02 +04:00
|
|
|
|
box.border_top_width + box.padding_top)
|
2011-11-24 14:00:33 +04:00
|
|
|
|
child_baseline_y = top + child.baseline
|
2011-11-24 15:40:52 +04:00
|
|
|
|
elif vertical_align in ('text-bottom', 'bottom'):
|
2011-11-24 14:00:33 +04:00
|
|
|
|
# align bottom with the bottom of the parent’s content area
|
|
|
|
|
bottom = (baseline_y - box.baseline + box.margin_top +
|
2011-12-30 20:19:02 +04:00
|
|
|
|
box.border_top_width + box.padding_top + box.height)
|
2011-11-24 14:00:33 +04:00
|
|
|
|
child_baseline_y = bottom - child.margin_height() + child.baseline
|
2011-11-23 21:23:33 +04:00
|
|
|
|
else:
|
|
|
|
|
# Numeric value: The child’s baseline is `vertical_align` above
|
|
|
|
|
# (lower y) the parent’s baseline.
|
|
|
|
|
child_baseline_y = baseline_y - vertical_align
|
2011-11-23 21:23:15 +04:00
|
|
|
|
# the child’s `top` is `child.baseline` above (lower y) its baseline.
|
|
|
|
|
top = child_baseline_y - child.baseline
|
2011-11-05 03:32:33 +04:00
|
|
|
|
child.position_y = top
|
|
|
|
|
bottom = top + child.margin_height()
|
2011-11-14 17:42:06 +04:00
|
|
|
|
if min_y is None or top < min_y:
|
|
|
|
|
min_y = top
|
|
|
|
|
if max_y is None or bottom > max_y:
|
|
|
|
|
max_y = bottom
|
2011-08-19 12:39:31 +04:00
|
|
|
|
if isinstance(child, boxes.InlineBox):
|
2011-11-23 21:23:15 +04:00
|
|
|
|
children_max_y, children_min_y = inline_box_verticality(
|
|
|
|
|
child, child_baseline_y)
|
2011-11-29 20:19:43 +04:00
|
|
|
|
if children_max_y is None:
|
|
|
|
|
if (
|
|
|
|
|
child.margin_width() == 0
|
|
|
|
|
# Guard against the case where a negative margin
|
|
|
|
|
# compensates something else.
|
|
|
|
|
and child.margin_left == 0
|
|
|
|
|
and child.margin_right == 0
|
|
|
|
|
):
|
|
|
|
|
# No content, ignore this box’s line-height.
|
|
|
|
|
# See http://www.w3.org/TR/CSS21/visuren.html#phantom-line-box
|
|
|
|
|
child.position_y = child_baseline_y
|
|
|
|
|
child.height = 0
|
|
|
|
|
continue
|
|
|
|
|
else:
|
|
|
|
|
assert children_min_y is not None
|
|
|
|
|
if children_min_y < min_y:
|
|
|
|
|
min_y = children_min_y
|
|
|
|
|
if children_max_y > max_y:
|
|
|
|
|
max_y = children_max_y
|
2011-10-19 17:14:43 +04:00
|
|
|
|
return max_y, min_y
|
2011-10-20 20:37:44 +04:00
|
|
|
|
|
|
|
|
|
|
2012-02-01 19:13:47 +04:00
|
|
|
|
def text_align(document, line, containing_block, last):
|
2011-10-20 20:37:44 +04:00
|
|
|
|
"""Return how much the line should be moved horizontally according to
|
|
|
|
|
the `text-align` property.
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
align = line.style.text_align
|
2011-12-16 19:02:49 +04:00
|
|
|
|
if align in ('-weasy-start', '-weasy-end'):
|
|
|
|
|
if (align == '-weasy-start') ^ (line.style.direction == 'rtl'):
|
|
|
|
|
align = 'left'
|
|
|
|
|
else:
|
|
|
|
|
align = 'right'
|
2012-02-01 19:13:47 +04:00
|
|
|
|
if align == 'justify' and last:
|
2012-01-26 14:33:49 +04:00
|
|
|
|
align = 'right' if line.style.direction == 'rtl' else 'left'
|
2011-10-20 20:37:44 +04:00
|
|
|
|
if align == 'left':
|
|
|
|
|
return 0
|
|
|
|
|
offset = containing_block.width - line.width
|
2012-02-01 19:13:47 +04:00
|
|
|
|
if align == 'justify':
|
|
|
|
|
justify_line(document, line, offset)
|
|
|
|
|
return 0
|
2011-10-20 20:37:44 +04:00
|
|
|
|
if align == 'center':
|
|
|
|
|
offset /= 2.
|
|
|
|
|
else:
|
|
|
|
|
assert align == 'right'
|
|
|
|
|
return offset
|
2012-02-01 19:13:47 +04:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def justify_line(document, line, extra_width):
|
|
|
|
|
nb_spaces = count_spaces(line)
|
|
|
|
|
if nb_spaces == 0:
|
|
|
|
|
# TODO: what should we do with single-word lines?
|
|
|
|
|
return
|
|
|
|
|
add_word_spacing(document, line, extra_width / nb_spaces, 0)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def count_spaces(box):
|
|
|
|
|
if isinstance(box, boxes.TextBox):
|
|
|
|
|
# TODO: remove trailing spaces correctly
|
|
|
|
|
return box.text.count(' ')
|
|
|
|
|
elif isinstance(box, (boxes.LineBox, boxes.InlineBox)):
|
|
|
|
|
return sum(count_spaces(child) for child in box.children)
|
|
|
|
|
else:
|
|
|
|
|
return 0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def add_word_spacing(document, box, extra_word_spacing, x_advance):
|
|
|
|
|
if isinstance(box, boxes.TextBox):
|
|
|
|
|
box.position_x += x_advance
|
|
|
|
|
box.style.word_spacing += extra_word_spacing
|
|
|
|
|
nb_spaces = count_spaces(box)
|
|
|
|
|
if nb_spaces > 0:
|
|
|
|
|
new_box, resume_at, _ = split_text_box(
|
|
|
|
|
document, box, 1e10, 0)
|
|
|
|
|
assert new_box is not None
|
|
|
|
|
assert resume_at is None
|
|
|
|
|
# XXX new_box.width - box.width is always 0???
|
|
|
|
|
#x_advance += new_box.width - box.width
|
|
|
|
|
x_advance += extra_word_spacing * nb_spaces
|
|
|
|
|
box.width = new_box.width
|
|
|
|
|
box.show_line = new_box.show_line
|
|
|
|
|
elif isinstance(box, (boxes.LineBox, boxes.InlineBox)):
|
|
|
|
|
box.position_x += x_advance
|
|
|
|
|
previous_x_advance = x_advance
|
|
|
|
|
for child in box.children:
|
|
|
|
|
x_advance = add_word_spacing(
|
|
|
|
|
document, child, extra_word_spacing, x_advance)
|
|
|
|
|
box.width += x_advance - previous_x_advance
|
|
|
|
|
else:
|
|
|
|
|
# Atomic inline-level box
|
|
|
|
|
box.translate(x_advance, 0)
|
|
|
|
|
return x_advance
|