2298d36bed
- Create Economist SubmissionTracking package correctly: * mainArticle = full blog post content * coverLetter = 216-word SIR— letter * Links to blog post via blogPostId - Archive 'Letter to The Economist' from blog posts (it's the cover letter) - Fix date display on article cards (use published_at) - Target publication already displaying via blue badge Database changes: - Make blogPostId optional in SubmissionTracking model - Economist package ID: 68fa85ae49d4900e7f2ecd83 - Le Monde package ID: 68fa2abd2e6acd5691932150 Next: Enhanced modal with tabs, validation, export 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
801 lines
32 KiB
Python
801 lines
32 KiB
Python
"""Preferred and minimum preferred width.
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Also known as max-content and min-content width, also known as the
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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 (https://dbaron.org/css/intrinsic/).
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"""
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import sys
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from functools import cache
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from math import inf
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from ..formatting_structure import boxes
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from ..text.line_break import can_break_text, split_first_line
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from .replaced import default_image_sizing
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def shrink_to_fit(context, box, available_content_width):
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"""Return the shrink-to-fit width of ``box``.
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*Warning:* both available_content_width and the return value are
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for width of the *content area*, not margin area.
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https://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_content_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 box.is_table_wrapper:
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return table_and_columns_preferred_widths(context, box, outer)[0]
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elif isinstance(box, boxes.TableCellBox):
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return table_cell_min_content_width(context, box, outer)
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elif isinstance(box, (boxes.BlockContainerBox, boxes.TableColumnBox)):
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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(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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elif isinstance(box, boxes.FlexContainerBox):
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return flex_min_content_width(context, box, outer)
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elif isinstance(box, boxes.GridContainerBox):
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# TODO: Get real grid size.
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return block_min_content_width(context, box, outer)
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else:
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raise TypeError(f'min-content width for {type(box).__name__} not handled yet')
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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 box.is_table_wrapper:
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return table_and_columns_preferred_widths(context, box, outer)[1]
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elif isinstance(box, boxes.TableCellBox):
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return table_cell_min_max_content_width(context, box, outer)[1]
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elif isinstance(box, (boxes.BlockContainerBox, boxes.TableColumnBox)):
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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(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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elif isinstance(box, boxes.FlexContainerBox):
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return flex_max_content_width(context, box, outer)
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elif isinstance(box, boxes.GridContainerBox):
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# TODO: Get real grid size.
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return block_max_content_width(context, box, outer)
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else:
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raise TypeError(f'max-content width for {type(box).__name__} not handled yet')
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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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# https://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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if min_width == 'auto' or min_width.unit == '%':
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min_width = 0
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else:
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min_width = min_width.value
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if max_width == 'auto' or max_width.unit == '%':
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max_width = inf
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else:
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max_width = max_width.value
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if isinstance(box, boxes.ReplacedBox):
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_, _, ratio = box.replacement.get_intrinsic_size(
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1, box.style['font_size'])
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if ratio is not None:
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min_height = box.style['min_height']
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if min_height != 'auto' and min_height.unit != '%':
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min_width = max(min_width, min_height.value * ratio)
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max_height = box.style['max_height']
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if max_height != 'auto' and max_height.unit != '%':
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max_width = min(max_width, max_height.value * ratio)
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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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# See https://drafts.csswg.org/css-tables-3/#cell-intrinsic-offsets
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# It is a set of computed values for border-left-width, padding-left,
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# padding-right, and border-right-width (along with zero values for
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# margin-left and margin-right)
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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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collapse = box.style['border_collapse'] == 'collapse'
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if left:
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if collapse and hasattr(box, 'border_left_width'):
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# In collapsed-borders mode: the computed horizontal padding of the
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# cell and, for border values, the used border-width values of the
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# cell (half the winning border-width)
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width += box.border_left_width
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else:
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# In separated-borders mode: the computed horizontal padding and
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# border of the table-cell
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width += box.style['border_left_width']
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if right:
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if collapse and hasattr(box, 'border_right_width'):
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# [...] the used border-width values of the cell
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width += box.border_right_width
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else:
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# [...] the computed border of the table-cell
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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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width = next(widths) if first_line else max(widths)
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return adjust(box, outer, width)
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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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# Remove trailing space, as split_first_line keeps trailing spaces when
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# max_width is not set.
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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 a ``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 table_cell_min_content_width(context, box, outer):
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"""Return the min-content width for a ``TableCellBox``."""
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# See https://www.w3.org/TR/css-tables-3/#outer-min-content
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# The outer min-content width of a table-cell is
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# max(min-width, min-content width) adjusted by
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# the cell intrinsic offsets.
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children_widths = [
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min_content_width(context, child)
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for child in box.children
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if not child.is_absolutely_positioned()]
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children_min_width = adjust(
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box,
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outer,
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max(children_widths) if children_widths else 0)
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return children_min_width
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def table_cell_min_max_content_width(context, box, outer=True):
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"""Return the min- and max-content width for a ``TableCellBox``."""
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# This is much faster than calling min and max separately.
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min_width = table_cell_min_content_width(context, box, outer)
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max_width = max(min_width, block_max_content_width(context, box, outer))
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return min_width, max_width
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def inline_line_widths(context, box, outer, is_line_start, minimum, skip_stack=None,
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first_line=False):
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"""Yield line width for each line."""
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# Set text indent.
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text_indent = 0
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if isinstance(box, boxes.LineBox) and box.style['text_indent'].unit != '%':
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text_indent = box.style['text_indent'].value
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# Yield widths for each line.
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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.items()
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for child in box.children[skip:]:
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# Skip absolutely positioned elements.
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if child.is_absolutely_positioned():
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continue
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# None is used in "lines" to track line breaks, transformed to 0 when yielded.
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if isinstance(child, boxes.InlineBox):
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# Inline box, call function recursively.
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lines = inline_line_widths(
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context, child, outer, is_line_start, minimum, skip_stack, first_line)
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if first_line:
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lines = [next(lines) or None]
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else:
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lines = [line or None for line in lines]
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if len(lines) == 1:
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lines[0] = adjust(child, outer, lines[0] or 0)
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else:
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lines[0] = adjust(child, outer, lines[0] or 0, right=False) or None
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lines[-1] = adjust(child, outer, lines[-1] or 0, left=False) or None
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elif isinstance(child, boxes.TextBox):
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# Text box, split into lines.
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white_space = child.style['white_space']
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space_collapse = white_space in ('normal', 'nowrap', 'pre-line')
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text_wrap = white_space in ('normal', 'pre-wrap', '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.items()
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assert skip_stack is None
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child_text = child.text.encode()[(skip or 0):]
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if is_line_start and space_collapse:
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child_text = child_text.lstrip(b' ')
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max_width = 0 if minimum else None
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lines = []
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resume_index = new_resume_index = 0
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while new_resume_index is not None:
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resume_index += new_resume_index
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_, _, new_resume_index, width, _, _ = split_first_line(
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child_text[resume_index:].decode(), child.style, context, max_width,
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child.justification_spacing, is_line_start=is_line_start,
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minimum=True)
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lines.append(width or None)
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if first_line:
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break
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if first_line and new_resume_index:
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# We only need the first line, break early.
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current_line += lines[0] or 0
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break
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# TODO: use the real next character instead of 'a' to detect line breaks.
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last_letter = child_text.decode()[-1:]
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can_break = can_break_text(last_letter + 'a', child.style['lang'])
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if minimum and text_wrap and can_break:
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# Add all possible line breaks for minimal width.
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lines.append(None)
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else:
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# Replaced elements, inline blocks…
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# https://www.w3.org/TR/css-text-3/#overflow-wrap
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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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# https://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 = [None, min_content_width(context, child), None]
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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] or 0
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if len(lines) > 1:
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# Forced line break(s).
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yield current_line + text_indent
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text_indent = 0
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if len(lines) > 2:
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for line in lines[1:-1]:
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yield line or 0
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current_line = lines[-1] or 0
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is_line_start = lines[-1] is None
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skip_stack = None
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yield current_line + text_indent
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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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https://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 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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https://dbaron.org/css/intrinsic/
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"""
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from .table import distribute_excess_width
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table = box.get_wrapped_table()
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result = context.tables.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(context, table))
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outer_max_width = adjust(
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box, outer=True, width=block_max_content_width(context, table))
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result = ([], [], [], [], total_horizontal_border_spacing, [])
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context.tables[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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colspan_cells = []
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colspans = set()
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# Define the intermediate content widths
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min_content_widths = [0] * grid_width
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max_content_widths = [0] * grid_width
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intrinsic_percentages = [0] * grid_width
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# Intermediate content widths for span 1
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for i in range(grid_width):
|
||
for groups in (column_groups, columns):
|
||
if group := groups[i]:
|
||
min_content_widths[i] = max(
|
||
min_content_widths[i], min_content_width(context, group))
|
||
max_content_widths[i] = max(
|
||
max_content_widths[i], max_content_width(context, group))
|
||
intrinsic_percentages[i] = max(
|
||
intrinsic_percentages[i], _percentage_contribution(group))
|
||
for cell in zipped_grid[i]:
|
||
if not cell:
|
||
continue
|
||
if cell.colspan == 1:
|
||
min_width, max_width = table_cell_min_max_content_width(context, cell)
|
||
min_content_widths[i] = max(min_content_widths[i], min_width)
|
||
max_content_widths[i] = max(max_content_widths[i], max_width)
|
||
intrinsic_percentages[i] = max(
|
||
intrinsic_percentages[i], _percentage_contribution(cell))
|
||
else:
|
||
colspan_cells.append(cell)
|
||
colspans.add(cell.colspan - 1)
|
||
|
||
# Intermediate content widths for span > 1 is wrong in the 4.1 section, as
|
||
# explained in its third issue. Min- and max-content widths are handled by
|
||
# the excess width distribution method, and percentages do not distribute
|
||
# widths to columns that have originating cells.
|
||
|
||
# Intermediate intrinsic percentage widths for span > 1
|
||
rows_origins = []
|
||
for y, row in enumerate(grid):
|
||
origin = None
|
||
rows_origins.append(row_origins := [])
|
||
for x, cell in enumerate(row):
|
||
if cell:
|
||
origin = x
|
||
row_origins.append(origin)
|
||
|
||
@cache
|
||
def get_percentage_contribution(origin_cell, origin, max_content_width):
|
||
# Cached for big colspan values, see #1155.
|
||
cell_slice = slice(origin, origin + origin_cell.colspan)
|
||
baseline_percentage = sum(intrinsic_percentages[cell_slice])
|
||
cell_percentage_contribution = _percentage_contribution(origin_cell)
|
||
diff = max(0, cell_percentage_contribution - baseline_percentage)
|
||
other_columns_contributions = [
|
||
max_content_widths[j]
|
||
for j in range(origin, origin + origin_cell.colspan)
|
||
if intrinsic_percentages[j] == 0]
|
||
other_columns_contributions_sum = sum(other_columns_contributions)
|
||
if other_columns_contributions_sum == 0:
|
||
ratio = 1 / (len(other_columns_contributions) or 1)
|
||
else:
|
||
ratio = max_content_width / other_columns_contributions_sum
|
||
return diff * ratio
|
||
|
||
for span in sorted(colspans):
|
||
percentage_contributions = []
|
||
for i in range(grid_width):
|
||
if percentage_contribution := intrinsic_percentages[i]:
|
||
percentage_contributions.append(percentage_contribution)
|
||
continue
|
||
for row, row_origins in zip(grid, rows_origins):
|
||
if (origin := row_origins[i]) is None:
|
||
continue
|
||
origin_cell = row[origin]
|
||
if origin_cell.colspan - 1 != span:
|
||
continue
|
||
cell_percentage_contribution = get_percentage_contribution(
|
||
origin_cell, origin, max_content_widths[i])
|
||
percentage_contribution = max(
|
||
percentage_contribution, cell_percentage_contribution)
|
||
|
||
percentage_contributions.append(percentage_contribution)
|
||
|
||
intrinsic_percentages = 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
|
||
|
||
intrinsic_percentages = [
|
||
min(percentage, 100 - sum(intrinsic_percentages[:i]))
|
||
for i, percentage in enumerate(intrinsic_percentages)]
|
||
|
||
# Max- and min-content widths for span > 1
|
||
for cell in colspan_cells:
|
||
min_content = min_content_width(context, cell)
|
||
max_content = max_content_width(context, cell)
|
||
column_slice = slice(cell.grid_x, cell.grid_x + cell.colspan)
|
||
columns_min_content = sum(min_content_widths[column_slice])
|
||
columns_max_content = sum(max_content_widths[column_slice])
|
||
if table.style['border_collapse'] == 'separate':
|
||
spacing = (cell.colspan - 1) * table.style['border_spacing'][0]
|
||
else:
|
||
spacing = 0
|
||
|
||
if min_content > columns_min_content + spacing:
|
||
excess_width = min_content - (columns_min_content + spacing)
|
||
distribute_excess_width(
|
||
context, zipped_grid, excess_width, min_content_widths,
|
||
constrainedness, intrinsic_percentages, max_content_widths,
|
||
column_slice)
|
||
|
||
if max_content > columns_max_content + spacing:
|
||
excess_width = max_content - (columns_max_content + spacing)
|
||
distribute_excess_width(
|
||
context, zipped_grid, excess_width, max_content_widths,
|
||
constrainedness, intrinsic_percentages, max_content_widths,
|
||
column_slice)
|
||
|
||
# Calculate the max- and min-content widths of table and columns
|
||
small_percentage_contributions = [
|
||
max_content_widths[i] / (intrinsic_percentages[i] / 100)
|
||
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."
|
||
#
|
||
# https://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]))
|
||
|
||
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"
|
||
# https://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)
|
||
context.tables[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
|
||
intrinsic_width, intrinsic_height, intrinsic_ratio = (
|
||
image.get_intrinsic_size(
|
||
box.style['image_resolution'], box.style['font_size']))
|
||
if intrinsic_ratio and not intrinsic_width and not intrinsic_height:
|
||
width = 0
|
||
else:
|
||
width, _ = default_image_sizing(
|
||
intrinsic_width, intrinsic_height, 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
|
||
intrinsic_width, intrinsic_height, intrinsic_ratio = (
|
||
image.get_intrinsic_size(
|
||
box.style['image_resolution'], box.style['font_size']))
|
||
width, _ = default_image_sizing(
|
||
intrinsic_width, intrinsic_height, 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 flex_min_content_width(context, box, outer=True):
|
||
"""Return the min-content width for an ``FlexContainerBox``."""
|
||
# TODO: use real values, see
|
||
# https://www.w3.org/TR/css-flexbox-1/#intrinsic-sizes
|
||
min_contents = [
|
||
min_content_width(context, child)
|
||
for child in box.children if child.is_flex_item]
|
||
if not min_contents:
|
||
return adjust(box, outer, 0)
|
||
if (box.style['flex_direction'].startswith('row') and
|
||
box.style['flex_wrap'] == 'nowrap'):
|
||
return adjust(box, outer, sum(min_contents))
|
||
else:
|
||
return adjust(box, outer, max(min_contents))
|
||
|
||
|
||
def flex_max_content_width(context, box, outer=True):
|
||
"""Return the max-content width for an ``FlexContainerBox``."""
|
||
# TODO: use real values, see
|
||
# https://www.w3.org/TR/css-flexbox-1/#intrinsic-sizes
|
||
max_contents = [
|
||
max_content_width(context, child)
|
||
for child in box.children if child.is_flex_item]
|
||
if not max_contents:
|
||
return adjust(box, outer, 0)
|
||
if box.style['flex_direction'].startswith('row'):
|
||
return adjust(box, outer, sum(max_contents))
|
||
else:
|
||
return adjust(box, outer, max(max_contents))
|
||
|
||
|
||
def trailing_whitespace_size(context, box):
|
||
"""Return the size of the trailing whitespace of ``box``."""
|
||
from .inline import split_first_line, split_text_box
|
||
|
||
# Find last box child, keep last parent to remove nested trailing spaces.
|
||
last_parent = None
|
||
while isinstance(box, (boxes.InlineBox, boxes.LineBox)):
|
||
if not box.children:
|
||
return 0
|
||
last_parent, box = box, box.children[-1]
|
||
|
||
# Return early if possible.
|
||
if not isinstance(box, boxes.TextBox) or not box.text:
|
||
# There’s no text in last child.
|
||
return 0
|
||
elif box.style['white_space'] not in ('normal', 'nowrap', 'pre-line'):
|
||
# Spaces don’t collapse.
|
||
return 0
|
||
elif box.style['font_size'] == 0:
|
||
# Trailing spaces take no space.
|
||
return 0
|
||
elif not box.text.endswith(' '):
|
||
# No trailing space.
|
||
return 0
|
||
|
||
# Strip text.
|
||
if stripped_text := box.text.rstrip(' '):
|
||
# Stripped text is not empty, calculate width difference.
|
||
resume = 0
|
||
while resume is not None:
|
||
old_resume = resume
|
||
old_box, resume, _ = split_text_box(context, box, None, resume)
|
||
assert old_box
|
||
stripped_box = box.copy_with_text(stripped_text)
|
||
stripped_box, resume, _ = split_text_box(
|
||
context, stripped_box, None, old_resume)
|
||
if stripped_box is None:
|
||
# Old box is split just before the trailing spaces.
|
||
return old_box.width
|
||
else:
|
||
# Return difference between old width and stripped width.
|
||
assert resume is None
|
||
return old_box.width - stripped_box.width
|
||
else:
|
||
# Stripped text is empty, render spaces to get width.
|
||
_, _, _, width, _, _ = split_first_line(
|
||
box.text, box.style, context, None, box.justification_spacing)
|
||
# Remove possible trailing spaces from previous child.
|
||
if last_parent and len(last_parent.children) >= 2:
|
||
width += trailing_whitespace_size(context, last_parent.children[-2])
|
||
return width
|