676 lines
25 KiB
Python
676 lines
25 KiB
Python
# coding: utf-8
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"""
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weasyprint.layout.preferred
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---------------------------
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Preferred and minimum preferred width, aka. max-content and min-content
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width, aka. the shrink-to-fit algorithm.
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Terms used (max-content width, min-content width) are defined in David
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Baron's unofficial draft (http://dbaron.org/css/intrinsic/).
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:copyright: Copyright 2011-2016 Simon Sapin and contributors, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from __future__ import division, unicode_literals
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import sys
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import weakref
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from .. import text
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from ..formatting_structure import boxes
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from .replaced import default_image_sizing
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def shrink_to_fit(context, box, available_width):
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"""Return the shrink-to-fit width of ``box``.
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*Warning:* both available_outer_width and the return value are
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for width of the *content area*, not margin area.
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http://www.w3.org/TR/CSS21/visudet.html#float-width
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"""
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return min(
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max(
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min_content_width(context, box, outer=False),
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available_width),
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max_content_width(context, box, outer=False))
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def min_content_width(context, box, outer=True):
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"""Return the min-content width for ``box``.
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This is the width by breaking at every line-break opportunity.
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"""
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if isinstance(box, (boxes.BlockContainerBox, boxes.TableColumnBox)):
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if box.is_table_wrapper:
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return table_and_columns_preferred_widths(context, box, outer)[0]
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else:
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return block_min_content_width(context, box, outer)
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elif isinstance(box, boxes.TableColumnGroupBox):
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return column_group_content_width(context, box)
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elif isinstance(box, (boxes.InlineBox, boxes.LineBox)):
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return inline_min_content_width(
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context, box, outer, is_line_start=True)
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elif isinstance(box, boxes.ReplacedBox):
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return replaced_min_content_width(box, outer)
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else:
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raise TypeError(
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'min-content width for %s not handled yet' %
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type(box).__name__)
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def max_content_width(context, box, outer=True):
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"""Return the max-content width for ``box``.
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This is the width by only breaking at forced line breaks.
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"""
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if isinstance(box, (boxes.BlockContainerBox, boxes.TableColumnBox)):
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if box.is_table_wrapper:
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return table_and_columns_preferred_widths(context, box, outer)[1]
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else:
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return block_max_content_width(context, box, outer)
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elif isinstance(box, boxes.TableColumnGroupBox):
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return column_group_content_width(context, box)
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elif isinstance(box, (boxes.InlineBox, boxes.LineBox)):
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return inline_max_content_width(
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context, box, outer, is_line_start=True)
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elif isinstance(box, boxes.ReplacedBox):
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return replaced_max_content_width(box, outer)
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else:
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raise TypeError(
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'max-content width for %s not handled yet' % type(box).__name__)
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def _block_content_width(context, box, function, outer):
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"""Helper to create ``block_*_content_width.``"""
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width = box.style.width
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if width == 'auto' or width.unit == '%':
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# "percentages on the following properties are treated instead as
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# though they were the following: width: auto"
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# http://dbaron.org/css/intrinsic/#outer-intrinsic
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children_widths = [
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function(context, child, outer=True) for child in box.children
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if not child.is_absolutely_positioned()]
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width = max(children_widths) if children_widths else 0
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else:
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assert width.unit == 'px'
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width = width.value
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return adjust(box, outer, width)
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def min_max(box, width):
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"""Get box width from given width and box min- and max-widths."""
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min_width = box.style.min_width
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max_width = box.style.max_width
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min_width = min_width.value if min_width.unit != '%' else 0
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max_width = max_width.value if max_width.unit != '%' else float('inf')
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return max(min_width, min(width, max_width))
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def margin_width(box, width, left=True, right=True):
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"""Add box paddings, borders and margins to ``width``."""
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percentages = 0
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for value in (
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(['margin_left', 'padding_left'] if left else []) +
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(['margin_right', 'padding_right'] if right else [])
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):
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style_value = box.style[value]
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if style_value != 'auto':
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if style_value.unit == 'px':
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width += style_value.value
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else:
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assert style_value.unit == '%'
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percentages += style_value.value
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if left:
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width += box.style.border_left_width
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if right:
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width += box.style.border_right_width
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if percentages < 100:
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return width / (1 - percentages / 100.)
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else:
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# Pathological case, ignore
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return 0
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def adjust(box, outer, width, left=True, right=True):
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"""Respect min/max and adjust width depending on ``outer``.
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If ``outer`` is set to ``True``, return margin width, else return content
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width.
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"""
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fixed = min_max(box, width)
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if outer:
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return margin_width(box, fixed, left, right)
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else:
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return fixed
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def block_min_content_width(context, box, outer=True):
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"""Return the min-content width for a ``BlockBox``."""
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return _block_content_width(
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context, box, min_content_width, outer)
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def block_max_content_width(context, box, outer=True):
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"""Return the max-content width for a ``BlockBox``."""
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return _block_content_width(context, box, max_content_width, outer)
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def inline_min_content_width(context, box, outer=True, skip_stack=None,
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first_line=False, is_line_start=False):
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"""Return the min-content width for an ``InlineBox``.
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The width is calculated from the lines from ``skip_stack``. If
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``first_line`` is ``True``, only the first line minimum width is
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calculated.
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"""
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widths = inline_line_widths(
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context, box, outer, is_line_start, minimum=True,
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skip_stack=skip_stack, first_line=first_line)
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if first_line:
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widths = [next(widths)]
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else:
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widths = list(widths)
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widths[-1] -= trailing_whitespace_size(context, box)
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return adjust(box, outer, max(widths))
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def inline_max_content_width(context, box, outer=True, is_line_start=False):
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"""Return the max-content width for an ``InlineBox``."""
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widths = list(
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inline_line_widths(context, box, outer, is_line_start, minimum=False))
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widths[-1] -= trailing_whitespace_size(context, box)
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return adjust(box, outer, max(widths))
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def column_group_content_width(context, box):
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"""Return the *-content width for an ``TableColumnGroupBox``."""
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width = box.style.width
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if width == 'auto' or width.unit == '%':
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width = 0
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else:
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assert width.unit == 'px'
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width = width.value
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return adjust(box, False, width)
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def inline_line_widths(context, box, outer, is_line_start, minimum,
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skip_stack=None, first_line=False):
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current_line = 0
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if skip_stack is None:
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skip = 0
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else:
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skip, skip_stack = skip_stack
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for index, child in box.enumerate_skip(skip):
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if child.is_absolutely_positioned():
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continue # Skip
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if isinstance(child, boxes.InlineBox):
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lines = inline_line_widths(
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context, child, outer, is_line_start, minimum, skip_stack,
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first_line)
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if first_line:
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lines = [next(lines)]
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else:
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lines = list(lines)
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if len(lines) == 1:
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lines[0] = adjust(child, outer, lines[0])
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else:
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lines[0] = adjust(child, outer, lines[0], right=False)
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lines[-1] = adjust(child, outer, lines[-1], left=False)
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elif isinstance(child, boxes.TextBox):
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space_collapse = child.style.white_space in (
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'normal', 'nowrap', 'pre-line')
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if skip_stack is None:
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skip = 0
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else:
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skip, skip_stack = skip_stack
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assert skip_stack is None
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child_text = child.text[(skip or 0):]
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if is_line_start and space_collapse:
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child_text = child_text.lstrip(' ')
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if minimum and child_text == ' ':
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lines = [0, 0]
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else:
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max_width = 0 if minimum else None
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lines = []
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resume_at = new_resume_at = 0
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while new_resume_at is not None:
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resume_at += new_resume_at
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_, _, new_resume_at, width, _, _ = (
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text.split_first_line(
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child_text[resume_at:], child.style, context,
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max_width, child.justification_spacing))
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lines.append(width)
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if first_line:
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break
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if first_line and new_resume_at:
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current_line += lines[0]
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break
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else:
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# http://www.w3.org/TR/css3-text/#line-break-details
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# "The line breaking behavior of a replaced element
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# or other atomic inline is equivalent to that
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# of the Object Replacement Character (U+FFFC)."
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# http://www.unicode.org/reports/tr14/#DescriptionOfProperties
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# "By default, there is a break opportunity
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# both before and after any inline object."
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if minimum:
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lines = [0, max_content_width(context, child), 0]
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else:
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lines = [max_content_width(context, child)]
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# The first text line goes on the current line
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current_line += lines[0]
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if len(lines) > 1:
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# Forced line break
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yield current_line
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if len(lines) > 2:
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for line in lines[1:-1]:
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yield line
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current_line = lines[-1]
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is_line_start = lines[-1] == 0
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skip_stack = None
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yield current_line
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TABLE_CACHE = weakref.WeakKeyDictionary()
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def _percentage_contribution(box):
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"""Return the percentage contribution of a cell, column or column group.
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http://dbaron.org/css/intrinsic/#pct-contrib
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"""
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min_width = (
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box.style.min_width.value if box.style.min_width != 'auto' and
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box.style.min_width.unit == '%' else 0)
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max_width = (
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box.style.max_width.value if box.style.max_width != 'auto' and
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box.style.max_width.unit == '%' else float('inf'))
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width = (
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box.style.width.value if box.style.width != 'auto' and
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box.style.width.unit == '%' else 0)
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return max(min_width, min(width, max_width))
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def table_and_columns_preferred_widths(context, box, outer=True):
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"""Return content widths for the auto layout table and its columns.
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The tuple returned is
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``(table_min_content_width, table_max_content_width,
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column_min_content_widths, column_max_content_widths,
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column_intrinsic_percentages, constrainedness,
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total_horizontal_border_spacing, grid)``
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http://dbaron.org/css/intrinsic/
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"""
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table = box.get_wrapped_table()
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result = TABLE_CACHE.get(table)
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if result:
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return result[outer]
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# Create the grid
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grid_width, grid_height = 0, 0
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row_number = 0
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for row_group in table.children:
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for row in row_group.children:
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for cell in row.children:
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grid_width = max(cell.grid_x + cell.colspan, grid_width)
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grid_height = max(row_number + cell.rowspan, grid_height)
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row_number += 1
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grid = [[None] * grid_width for i in range(grid_height)]
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row_number = 0
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for row_group in table.children:
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for row in row_group.children:
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for cell in row.children:
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grid[row_number][cell.grid_x] = cell
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row_number += 1
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zipped_grid = list(zip(*grid))
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# Define the total horizontal border spacing
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if table.style.border_collapse == 'separate' and grid_width > 0:
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total_horizontal_border_spacing = (
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table.style.border_spacing[0] *
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(1 + len([column for column in zipped_grid if any(column)])))
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else:
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total_horizontal_border_spacing = 0
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if grid_width == 0 or grid_height == 0:
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table.children = []
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min_width = block_min_content_width(context, table, outer=False)
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max_width = block_max_content_width(context, table, outer=False)
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outer_min_width = adjust(
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box, outer=True, width=block_min_content_width(
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context, table, outer=True))
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outer_max_width = adjust(
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box, outer=True, width=block_max_content_width(
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context, table, outer=True))
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result = ([], [], [], [], total_horizontal_border_spacing, [])
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TABLE_CACHE[table] = result = {
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False: (min_width, max_width) + result,
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True: (outer_min_width, outer_max_width) + result,
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}
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return result[outer]
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column_groups = [None] * grid_width
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columns = [None] * grid_width
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column_number = 0
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for column_group in table.column_groups:
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for column in column_group.children:
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column_groups[column_number] = column_group
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columns[column_number] = column
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column_number += 1
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if column_number == grid_width:
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break
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else:
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continue
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break
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# Define the intermediate content widths
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min_content_widths = [0 for i in range(grid_width)]
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max_content_widths = [0 for i in range(grid_width)]
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intrinsic_percentages = [0 for i in range(grid_width)]
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# Intermediate content widths for span 1
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for i in range(grid_width):
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for groups in (column_groups, columns):
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if groups[i]:
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min_content_widths[i] = max(
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min_content_widths[i],
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min_content_width(context, groups[i]))
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max_content_widths[i] = max(
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max_content_widths[i],
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max_content_width(context, groups[i]))
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intrinsic_percentages[i] = max(
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intrinsic_percentages[i],
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_percentage_contribution(groups[i]))
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for cell in zipped_grid[i]:
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if cell and cell.colspan == 1:
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min_content_widths[i] = max(
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min_content_widths[i], min_content_width(context, cell))
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max_content_widths[i] = max(
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max_content_widths[i], max_content_width(context, cell))
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intrinsic_percentages[i] = max(
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intrinsic_percentages[i],
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_percentage_contribution(cell))
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# Intermediate content widths for span N
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for span in range(1, grid_width):
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min_contributions = []
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max_contributions = []
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percentage_contributions = []
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for i in range(grid_width):
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min_contribution = min_content_widths[i]
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max_contribution = max_content_widths[i]
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percentage_contribution = intrinsic_percentages[i]
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for j, cell in enumerate(zipped_grid[i]):
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indexes = [k for k in range(i + 1) if grid[j][k]]
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if not indexes:
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continue
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origin = max(indexes)
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origin_cell = grid[j][origin]
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if origin_cell.colspan - 1 != span:
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continue
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cell_slice = slice(origin, origin + origin_cell.colspan)
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baseline_border_spacing = (
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(origin_cell.colspan - 1) *
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table.style.border_spacing[0])
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baseline_min_content = sum(min_content_widths[cell_slice])
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baseline_max_content = sum(max_content_widths[cell_slice])
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baseline_percentage = sum(
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intrinsic_percentages[cell_slice])
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# Cell contributiion to min- and max-content widths
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content_width_diff = (
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max_content_widths[i] - min_content_widths[i])
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baseline_diff = baseline_max_content - baseline_min_content
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if baseline_diff:
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diff_ratio = content_width_diff / baseline_diff
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else:
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diff_ratio = 0
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cell_min_width = max(
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0,
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min_content_width(context, grid[j][origin]) -
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baseline_max_content - baseline_border_spacing)
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cell_max_width = max(
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0,
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max_content_width(context, grid[j][origin]) -
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baseline_max_content - baseline_border_spacing)
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clamped_cell_width = min(
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cell_min_width,
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baseline_max_content - baseline_min_content)
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if baseline_max_content:
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ratio = max_content_widths[i] / baseline_max_content
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else:
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ratio = 0
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min_contribution = max(
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min_contribution,
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min_content_widths[i] +
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diff_ratio * clamped_cell_width +
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(1 - ratio) * cell_min_width)
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max_contribution = max(
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max_contribution,
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max_content_widths[i] + (1 - ratio) * cell_max_width)
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# Cell contributiion to intrinsic percentage width
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if intrinsic_percentages[i] == 0:
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diff = max(
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0,
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_percentage_contribution(origin_cell) -
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baseline_percentage)
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other_columns_contributions = [
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max_content_widths[j]
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for j in range(
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origin, origin + origin_cell.colspan)
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if intrinsic_percentages[j] == 0]
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other_columns_contributions_sum = sum(
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other_columns_contributions)
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if other_columns_contributions_sum == 0:
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ratio = 1 / len(other_columns_contributions)
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else:
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ratio = (
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max_content_widths[i] /
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other_columns_contributions_sum)
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percentage_contribution = diff * ratio
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min_contributions.append(min_contribution)
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max_contributions.append(max_contribution)
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percentage_contributions.append(percentage_contribution)
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min_content_widths = min_contributions
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max_content_widths = max_contributions
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intrinsic_percentages = percentage_contributions
|
|
|
|
intrinsic_percentages = [
|
|
min(percentage, 100 - sum(intrinsic_percentages[:i]))
|
|
for i, percentage in enumerate(intrinsic_percentages)]
|
|
|
|
# Calculate the max- and min-content widths of table and columns
|
|
small_percentage_contributions = [
|
|
max_content_widths[i] /
|
|
(intrinsic_percentages[i] / 100. or float('inf'))
|
|
for i in range(grid_width)
|
|
if intrinsic_percentages[i]]
|
|
large_percentage_contribution_numerator = sum(
|
|
max_content_widths[i] for i in range(grid_width)
|
|
if intrinsic_percentages[i] == 0)
|
|
large_percentage_contribution_denominator = (
|
|
(100 - sum(intrinsic_percentages)) / 100.)
|
|
if large_percentage_contribution_denominator == 0:
|
|
if large_percentage_contribution_numerator == 0:
|
|
large_percentage_contribution = 0
|
|
else:
|
|
# "the large percentage contribution of the table [is] an
|
|
# infinitely large number if the numerator is nonzero [and] the
|
|
# denominator of that ratio is 0."
|
|
#
|
|
# http://dbaron.org/css/intrinsic/#autotableintrinsic
|
|
#
|
|
# Please note that "an infinitely large number" is not "infinite",
|
|
# and that's probably not a coincindence: putting 'inf' here breaks
|
|
# some cases (see #305).
|
|
large_percentage_contribution = sys.maxsize
|
|
else:
|
|
large_percentage_contribution = (
|
|
large_percentage_contribution_numerator /
|
|
large_percentage_contribution_denominator)
|
|
|
|
table_min_content_width = (
|
|
total_horizontal_border_spacing + sum(min_content_widths))
|
|
table_max_content_width = (
|
|
total_horizontal_border_spacing + max(
|
|
[sum(max_content_widths), large_percentage_contribution] +
|
|
small_percentage_contributions))
|
|
|
|
# Define constrainedness
|
|
constrainedness = [False for i in range(grid_width)]
|
|
for i in range(grid_width):
|
|
if (column_groups[i] and column_groups[i].style.width != 'auto' and
|
|
column_groups[i].style.width.unit != '%'):
|
|
constrainedness[i] = True
|
|
continue
|
|
if (columns[i] and columns[i].style.width != 'auto' and
|
|
columns[i].style.width.unit != '%'):
|
|
constrainedness[i] = True
|
|
continue
|
|
for cell in zipped_grid[i]:
|
|
if (cell and cell.colspan == 1 and cell.style.width != 'auto' and
|
|
cell.style.width.unit != '%'):
|
|
constrainedness[i] = True
|
|
break
|
|
|
|
if table.style.width != 'auto' and table.style.width.unit == 'px':
|
|
# "percentages on the following properties are treated instead as
|
|
# though they were the following: width: auto"
|
|
# http://dbaron.org/css/intrinsic/#outer-intrinsic
|
|
table_min_width = table_max_width = table.style.width.value
|
|
else:
|
|
table_min_width = table_min_content_width
|
|
table_max_width = table_max_content_width
|
|
|
|
table_min_content_width = max(
|
|
table_min_content_width, adjust(
|
|
table, outer=False, width=table_min_width))
|
|
table_max_content_width = max(
|
|
table_max_content_width, adjust(
|
|
table, outer=False, width=table_max_width))
|
|
table_outer_min_content_width = margin_width(
|
|
table, margin_width(box, table_min_content_width))
|
|
table_outer_max_content_width = margin_width(
|
|
table, margin_width(box, table_max_content_width))
|
|
|
|
result = (
|
|
min_content_widths, max_content_widths, intrinsic_percentages,
|
|
constrainedness, total_horizontal_border_spacing, zipped_grid)
|
|
TABLE_CACHE[table] = result = {
|
|
False: (table_min_content_width, table_max_content_width) + result,
|
|
True: (
|
|
(table_outer_min_content_width, table_outer_max_content_width) +
|
|
result),
|
|
}
|
|
return result[outer]
|
|
|
|
|
|
def replaced_min_content_width(box, outer=True):
|
|
"""Return the min-content width for an ``InlineReplacedBox``."""
|
|
width = box.style.width
|
|
if width == 'auto':
|
|
height = box.style.height
|
|
if height == 'auto' or height.unit == '%':
|
|
height = 'auto'
|
|
else:
|
|
assert height.unit == 'px'
|
|
height = height.value
|
|
if box.style.max_width != 'auto' and box.style.max_width.unit == '%':
|
|
# See https://drafts.csswg.org/css-sizing/#intrinsic-contribution
|
|
width = 0
|
|
else:
|
|
image = box.replacement
|
|
iwidth, iheight = image.get_intrinsic_size(
|
|
box.style.image_resolution, box.style.font_size)
|
|
width, _ = default_image_sizing(
|
|
iwidth, iheight, image.intrinsic_ratio, 'auto', height,
|
|
default_width=300, default_height=150)
|
|
elif box.style.width.unit == '%':
|
|
# See https://drafts.csswg.org/css-sizing/#intrinsic-contribution
|
|
width = 0
|
|
else:
|
|
assert width.unit == 'px'
|
|
width = width.value
|
|
return adjust(box, outer, width)
|
|
|
|
|
|
def replaced_max_content_width(box, outer=True):
|
|
"""Return the max-content width for an ``InlineReplacedBox``."""
|
|
width = box.style['width']
|
|
if width == 'auto':
|
|
height = box.style['height']
|
|
if height == 'auto' or height.unit == '%':
|
|
height = 'auto'
|
|
else:
|
|
assert height.unit == 'px'
|
|
height = height.value
|
|
image = box.replacement
|
|
iwidth, iheight = image.get_intrinsic_size(
|
|
box.style['image_resolution'], box.style['font_size'])
|
|
width, _ = default_image_sizing(
|
|
iwidth, iheight, image.intrinsic_ratio, 'auto', height,
|
|
default_width=300, default_height=150)
|
|
else:
|
|
assert width.unit == 'px'
|
|
width = width.value
|
|
return adjust(box, outer, width)
|
|
|
|
|
|
def trailing_whitespace_size(context, box):
|
|
"""Return the size of the trailing whitespace of ``box``."""
|
|
from .inlines import split_text_box, split_first_line
|
|
|
|
while isinstance(box, (boxes.InlineBox, boxes.LineBox)):
|
|
if not box.children:
|
|
return 0
|
|
box = box.children[-1]
|
|
if not (isinstance(box, boxes.TextBox) and box.text and
|
|
box.style.white_space in ('normal', 'nowrap', 'pre-line')):
|
|
return 0
|
|
stripped_text = box.text.rstrip(' ')
|
|
if box.style.font_size == 0 or len(stripped_text) == len(box.text):
|
|
return 0
|
|
if stripped_text:
|
|
old_box, _, _ = split_text_box(context, box, None, 0)
|
|
assert old_box
|
|
stripped_box = box.copy_with_text(stripped_text)
|
|
stripped_box, resume, _ = split_text_box(
|
|
context, stripped_box, None, 0)
|
|
assert stripped_box is not None
|
|
assert resume is None
|
|
return old_box.width - stripped_box.width
|
|
else:
|
|
_, _, _, width, _, _ = split_first_line(
|
|
box.text, box.style, context, None, box.justification_spacing)
|
|
return width
|