tightening
This commit is contained in:
randogoth
parent
5e0e4b701e
commit
937930ef5c
1 changed files with 136 additions and 175 deletions
305
text_renderer.py
305
text_renderer.py
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@ -4,6 +4,7 @@ import re
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import string
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import textwrap
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from dataclasses import dataclass
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from functools import partial
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from typing import Callable, Dict, List, Optional, Tuple
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from md_types import (
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@ -54,6 +55,16 @@ except ImportError: # pragma: no cover - emit a helpful error at runtime instea
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FontNotFound = ValueError # type: ignore[assignment]
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CODE_STASH_RE = re.compile(r"`[^`]*`")
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STRIKETHROUGH_RE = re.compile(r"~~(.*?)~~")
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BOLD_RE = re.compile(r"\*\*(.*?)\*\*")
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ITALIC_RE = re.compile(r"(?<!\*)\*(?!\*)(.*?)(?<!\*)\*(?!\*)")
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UNDERLINE_STRONG_RE = re.compile(r"__(.*?)__")
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UNDERLINE_EM_RE = re.compile(r"(?<!_)_(?!_)(.*?)(?<!_)_(?!_)")
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IMAGE_RE = re.compile(r"!\[([^\]]*)\]\(([^)]+)\)")
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LINK_RE = re.compile(r"(?<!\!)\[([^\]]+)\]\(([^)]+)\)")
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@dataclass
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class BlockRecord:
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start: int
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@ -99,6 +110,16 @@ class TextRenderer:
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raise RuntimeError(f"Failed to initialise hyphenator for language '{self.hyphen_lang}': {exc}") from exc
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else:
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self.hyphenator = None
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self._handlers: Dict[BlockKind, Callable[[object, BlockStyle], None]] = {
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BlockKind.PARAGRAPH: self._render_paragraph,
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BlockKind.HEADING: self._render_heading,
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BlockKind.CODE_BLOCK: self._render_code_block,
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BlockKind.BLOCKQUOTE: self._render_blockquote,
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BlockKind.LIST_ITEM: self._render_list_item,
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BlockKind.HORIZONTAL_RULE: self._render_horizontal_rule,
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BlockKind.BLANK_LINE: self._render_blank_line,
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BlockKind.CUSTOM_BLOCK: self._render_custom_block,
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}
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def handle_event(self, event: BlockEvent | StyleUpdateEvent) -> None:
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if isinstance(event, BlockEvent):
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@ -124,61 +145,37 @@ class TextRenderer:
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return self.output
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def _handle_block_event(self, event: BlockEvent) -> None:
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if event.kind is BlockKind.PARAGRAPH:
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self._render_paragraph(event.payload, event.style)
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elif event.kind is BlockKind.HEADING:
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self._render_heading(event.payload, event.style)
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elif event.kind is BlockKind.CODE_BLOCK:
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self._render_code_block(event.payload, event.style)
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elif event.kind is BlockKind.BLOCKQUOTE:
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self._render_blockquote(event.payload, event.style)
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elif event.kind is BlockKind.LIST_ITEM:
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self._render_list_item(event.payload, event.style)
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elif event.kind is BlockKind.HORIZONTAL_RULE:
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self._render_horizontal_rule(event.style)
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elif event.kind is BlockKind.BLANK_LINE:
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self._render_blank_line()
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elif event.kind is BlockKind.CUSTOM_BLOCK:
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self._render_custom_block(event.payload, event.style)
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else: # pragma: no cover - defensive default
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handler = self._handlers.get(event.kind)
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if handler:
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handler(event.payload, event.style)
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else:
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self._last_stylable_block = None
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def _render_paragraph(self, payload: ParagraphPayload, style: BlockStyle) -> None:
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processed = self._process_inline(payload.text)
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def render(target_style: BlockStyle) -> List[str]:
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return self._wrap_text(processed, style=target_style, hyphenate=self.hyphenate)
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lines = render(style)
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self._emit_block(lines, stylable=True, render_fn=render, style=style)
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self._wrap_emit(processed, style, stylable=True, hyphenate=self.hyphenate)
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if self.paragraph_spacing > 0:
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self.output.extend([""] * self.paragraph_spacing)
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def _render_heading(self, payload: HeadingPayload, style: BlockStyle) -> None:
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self._ensure_header_spacing()
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def render(target_style: BlockStyle) -> List[str]:
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return self._render_heading_lines(payload.level, payload.text, target_style)
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lines = render(style)
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self._emit_block(lines, stylable=True, render_fn=render, style=style)
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self._emit_render(partial(self._render_heading_lines, payload.level, payload.text), style, stylable=True)
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def _render_code_block(self, payload: CodeBlockPayload, style: BlockStyle) -> None:
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lines = self._format_code_block(payload.lines, style)
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self._emit_block(lines, stylable=False)
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self._emit_render(partial(self._format_code_block, payload.lines), style)
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def _render_blockquote(self, payload: BlockQuotePayload, style: BlockStyle) -> None:
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processed = self._process_inline(payload.text)
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indent_unit = " | " if self.blockquote_bars else " "
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indent = indent_unit * max(1, payload.depth)
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wrapped = self._wrap_text(
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self._wrap_emit(
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processed,
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style,
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initial_indent=indent,
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subsequent_indent=indent,
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style=style,
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hyphenate=self.hyphenate,
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)
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self._emit_block(wrapped, stylable=False)
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def _render_list_item(self, payload: ListItemPayload, style: BlockStyle) -> None:
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base_indent = payload.indent.replace("\t", " ")
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@ -188,30 +185,25 @@ class TextRenderer:
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initial_indent = f"{base_indent}{marker_indent}{marker}{text_spacing}"
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subsequent_indent = f"{base_indent}{marker_indent}{' ' * len(marker)}{text_spacing}"
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processed = self._process_inline(payload.text)
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wrapped = self._wrap_text(
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self._wrap_emit(
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processed,
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style,
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initial_indent=initial_indent,
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subsequent_indent=subsequent_indent,
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style=style,
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hyphenate=self.hyphenate,
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)
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self._emit_block(wrapped, stylable=False)
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def _render_horizontal_rule(self, style: BlockStyle) -> None:
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def _render_horizontal_rule(self, _payload: object, style: BlockStyle) -> None:
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line = self._render_horizontal_rule_line(style)
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self._emit_block([line], stylable=False)
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def _render_blank_line(self) -> None:
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def _render_blank_line(self, *_: object) -> None:
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if self.paragraph_spacing == 0:
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self.output.append("")
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def _render_custom_block(self, payload: AsciiArtPayload, style: BlockStyle) -> None:
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def render(target_style: BlockStyle) -> List[str]:
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return self._layout_ascii_pieces(payload.pieces, target_style)
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lines = render(style)
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self._emit_block(lines, stylable=True, render_fn=render, style=style)
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self._emit_render(partial(self._layout_ascii_pieces, payload.pieces), style, stylable=True)
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def _layout_ascii_pieces(self, pieces: List[AsciiArtPiece], style: BlockStyle) -> List[str]:
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if not pieces:
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@ -220,9 +212,7 @@ class TextRenderer:
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piece = pieces[0]
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return self._align_preformatted_lines(piece.lines, style, piece.align)
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margin_left = min(max(style.margin_left, 0), self.width - 1)
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margin_right = max(style.margin_right, 0)
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available_width = max(1, self.width - margin_left - margin_right)
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margin_left, _, available_width = self._margins(style)
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heights = [len(piece.lines) for piece in pieces]
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max_height = max(heights) if heights else 0
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@ -230,11 +220,11 @@ class TextRenderer:
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positions = self._compute_ascii_positions(pieces, widths, available_width)
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if positions is None:
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# fall back to vertical stacking by aligning individually
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result: List[str] = []
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for piece in pieces:
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result.extend(self._align_preformatted_lines(piece.lines, style, piece.align))
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return result
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return [
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aligned_line
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for piece in pieces
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for aligned_line in self._align_preformatted_lines(piece.lines, style, piece.align)
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]
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canvas = [list(" " * available_width) for _ in range(max_height)]
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for piece, pos, width in positions:
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@ -252,11 +242,7 @@ class TextRenderer:
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canvas[row_index][target_index] = char
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prefix = " " * margin_left
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result_lines: List[str] = []
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for row in canvas:
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content = "".join(row).rstrip()
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result_lines.append(prefix + content)
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return result_lines
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return [prefix + "".join(row).rstrip() for row in canvas]
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def _compute_ascii_positions(
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self,
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@ -272,34 +258,24 @@ class TextRenderer:
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right_cursor = available_width
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placement_map: Dict[int, Tuple[int, int]] = {}
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# Categorise pieces by alignment preference
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left_indices: List[int] = []
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center_indices: List[int] = []
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right_indices: List[int] = []
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groups: Dict[str, List[int]] = {"left": [], "center": [], "right": []}
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for index, piece in enumerate(pieces):
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align = (piece.align or "left").lower()
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if align == "right":
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right_indices.append(index)
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elif align == "center":
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center_indices.append(index)
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else:
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left_indices.append(index)
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groups.get((piece.align or "left").lower(), groups["left"]).append(index)
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for index in left_indices:
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for index in groups["left"]:
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width = min(widths[index], available_width)
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pos = left_cursor
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left_cursor = min(available_width, pos + width + gap)
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placement_map[index] = (pos, width)
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for index in reversed(right_indices):
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for index in reversed(groups["right"]):
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width = min(widths[index], available_width)
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pos = max(0, right_cursor - width)
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right_cursor = max(0, pos - gap)
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placement_map[index] = (pos, width)
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center_used = False
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for index in center_indices:
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for index in groups["center"]:
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width = min(widths[index], available_width)
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pos = max(0, (available_width - width) // 2)
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if center_used:
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@ -342,9 +318,7 @@ class TextRenderer:
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) -> List[str]:
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if not lines:
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return []
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margin_left = min(max(style.margin_left, 0), self.width - 1)
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margin_right = max(style.margin_right, 0)
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available_width = max(1, self.width - margin_left - margin_right)
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margin_left, _, available_width = self._margins(style)
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processed = [line.rstrip("\n") for line in lines]
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block_width = max((len(line) for line in processed), default=0)
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extra_space = max(0, available_width - block_width)
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@ -360,6 +334,52 @@ class TextRenderer:
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indent_str = " " * indent
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return [indent_str + line for line in processed]
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def _margins(self, style: BlockStyle) -> Tuple[int, int, int]:
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margin_left = max(0, min(style.margin_left, self.width - 1))
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remaining = self.width - margin_left
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margin_right = max(0, min(style.margin_right, max(0, remaining - 1)))
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available = max(1, self.width - margin_left - margin_right)
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return margin_left, margin_right, available
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def _wrap_emit(
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self,
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text: str,
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style: BlockStyle,
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*,
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initial_indent: str = "",
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subsequent_indent: Optional[str] = None,
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hyphenate: bool,
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stylable: bool = False,
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) -> None:
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if not text:
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return
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self._emit_render(
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lambda target_style: self._wrap_text(
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text,
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initial_indent=initial_indent,
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subsequent_indent=subsequent_indent if subsequent_indent is not None else initial_indent,
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style=target_style,
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hyphenate=hyphenate,
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),
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style,
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stylable=stylable,
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)
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def _emit_render(
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self,
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render_fn: Callable[[BlockStyle], List[str]],
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style: BlockStyle,
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*,
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stylable: bool = False,
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) -> None:
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self._emit_block(
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render_fn(style),
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stylable=stylable,
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render_fn=render_fn if stylable else None,
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style=style if stylable else None,
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)
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def _emit_block(
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self,
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lines: List[str],
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@ -449,7 +469,7 @@ class TextRenderer:
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if overflow_detected and self.figlet_fallback:
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return None
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margin_left = min(max(style.margin_left, 0), self.width - 1)
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margin_left, _, _ = self._margins(style)
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indent_str = " " * margin_left
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return [indent_str + line.rstrip() for line in lines]
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@ -486,87 +506,45 @@ class TextRenderer:
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def _render_horizontal_rule_line(self, style: BlockStyle) -> str:
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margin_left = min(max(style.margin_left, 0), self.width - 1)
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available_width = max(1, self._effective_width(style))
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margin_left, _, available_width = self._margins(style)
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return " " * margin_left + "-" * available_width
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def _format_code_block(self, lines: List[str], style: BlockStyle) -> List[str]:
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if not lines:
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return []
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if self.wrap_code_blocks:
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if self.code_block_line_numbers:
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return self._format_wrapped_code_block_numbered(lines, style)
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return self._format_wrapped_code_block_plain(lines, style)
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if self.code_block_line_numbers:
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return self._format_code_block_numbered(lines, style)
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return self._format_code_block_plain(lines, style)
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margin_left, _, available = self._margins(style)
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indent = " " * margin_left
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numbered = self.code_block_line_numbers
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wrapped = self.wrap_code_blocks
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def _format_code_block_numbered(self, lines: List[str], style: BlockStyle) -> List[str]:
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margin_indent = " " * max(0, style.margin_left)
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if numbered:
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width = max(2, len(str(len(lines))))
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formatted: List[str] = []
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for idx, line in enumerate(lines, start=1):
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formatted.append(f"{margin_indent}{idx:0{width}d} | {line}")
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formatted.append(margin_indent if margin_indent else "")
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return formatted
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def _format_code_block_plain(self, lines: List[str], style: BlockStyle) -> List[str]:
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margin_indent = " " * max(0, style.margin_left)
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base_prefix = margin_indent + " "
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formatted: List[str] = []
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for line in lines:
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if line:
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formatted.append(base_prefix + line)
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lead_fmt = f"{indent}{{:0{width}d}} | "
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cont_prefix = f"{indent}{' ' * width} | "
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content_width = max(1, available - (len(lead_fmt.format(0)) - len(indent)))
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else:
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formatted.append(base_prefix)
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formatted.append(margin_indent if margin_indent else "")
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return formatted
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base = indent + " "
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lead_fmt = None
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cont_prefix = base
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content_width = max(1, available - 3)
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def lead(idx: int) -> str:
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return lead_fmt.format(idx) if numbered else cont_prefix
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def _format_wrapped_code_block_numbered(self, lines: List[str], style: BlockStyle) -> List[str]:
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margin_left = min(max(style.margin_left, 0), self.width - 1)
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margin_indent = " " * margin_left
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effective_width = self._effective_width(style)
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number_width = max(2, len(str(len(lines))))
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prefix_template = f"{margin_indent}{{num:0{number_width}d}} | "
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continuation_prefix = f"{margin_indent}{' ' * number_width} | "
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prefix_len_without_margin = len(prefix_template.format(num=0)) - len(margin_indent)
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content_width = max(1, effective_width - prefix_len_without_margin)
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formatted: List[str] = []
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for idx, line in enumerate(lines, start=1):
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if not line:
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formatted.append(prefix_template.format(num=idx))
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prefix = lead(idx)
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segments = (
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self._wrap_code_line_segments(line, content_width)
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if wrapped and line
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else ([line] if line else [])
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)
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if not segments:
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formatted.append(prefix)
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continue
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wrapped_segments = self._wrap_code_line_segments(line, content_width)
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if not wrapped_segments:
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formatted.append(prefix_template.format(num=idx))
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continue
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first_segment, *rest_segments = wrapped_segments
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formatted.append(prefix_template.format(num=idx) + first_segment)
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for segment in rest_segments:
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formatted.append(continuation_prefix + segment)
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formatted.append(margin_indent if margin_indent else "")
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return formatted
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def _format_wrapped_code_block_plain(self, lines: List[str], style: BlockStyle) -> List[str]:
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margin_left = min(max(style.margin_left, 0), self.width - 1)
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margin_indent = " " * margin_left
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effective_width = self._effective_width(style)
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content_prefix = margin_indent + " "
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content_width = max(1, effective_width - 3)
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formatted: List[str] = []
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for line in lines:
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if not line:
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formatted.append(content_prefix)
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continue
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wrapped_segments = self._wrap_code_line_segments(line, content_width)
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if not wrapped_segments:
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formatted.append(content_prefix)
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continue
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first_segment, *rest_segments = wrapped_segments
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formatted.append(content_prefix + first_segment)
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for segment in rest_segments:
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formatted.append(content_prefix + segment)
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formatted.append(margin_indent if margin_indent else "")
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formatted.append(prefix + segments[0])
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formatted.extend(cont_prefix + segment for segment in segments[1:])
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||||
formatted.append(indent if indent else "")
|
||||
return formatted
|
||||
|
||||
def _wrap_code_line_segments(self, line: str, content_width: int) -> List[str]:
|
||||
|
|
@ -625,23 +603,11 @@ class TextRenderer:
|
|||
code_segments.append(match.group(0))
|
||||
return f"\u0000CODE{len(code_segments) - 1}\u0000"
|
||||
|
||||
text = re.sub(r"`[^`]*`", stash_code, text)
|
||||
text = CODE_STASH_RE.sub(stash_code, text)
|
||||
|
||||
text = self._apply_pattern(
|
||||
text,
|
||||
re.compile(r"~~(.*?)~~"),
|
||||
lambda m, src: self._stylize_delimited(m.group(1), "-", transform="preserve"),
|
||||
)
|
||||
text = self._apply_pattern(
|
||||
text,
|
||||
re.compile(r"\*\*(.*?)\*\*"),
|
||||
lambda m, src: self._replace_spaced_emphasis(src, m, transform="upper"),
|
||||
)
|
||||
text = self._apply_pattern(
|
||||
text,
|
||||
re.compile(r"(?<!\*)\*(?!\*)(.*?)(?<!\*)\*(?!\*)"),
|
||||
lambda m, src: self._replace_spaced_emphasis(src, m, transform="preserve"),
|
||||
)
|
||||
text = self._apply_pattern(text, STRIKETHROUGH_RE, lambda m, src: self._stylize_delimited(m.group(1), "-", transform="preserve"))
|
||||
text = self._apply_pattern(text, BOLD_RE, lambda m, src: self._replace_spaced_emphasis(src, m, transform="upper"))
|
||||
text = self._apply_pattern(text, ITALIC_RE, lambda m, src: self._replace_spaced_emphasis(src, m, transform="preserve"))
|
||||
|
||||
emphasis_segments: List[str] = []
|
||||
|
||||
|
|
@ -660,7 +626,7 @@ class TextRenderer:
|
|||
|
||||
text = apply_with_placeholder(
|
||||
text,
|
||||
re.compile(r"__(.*?)__"),
|
||||
UNDERLINE_STRONG_RE,
|
||||
lambda m: self._apply_emphasis_spacing(
|
||||
m.string,
|
||||
m.start(),
|
||||
|
|
@ -670,7 +636,7 @@ class TextRenderer:
|
|||
)
|
||||
text = apply_with_placeholder(
|
||||
text,
|
||||
re.compile(r"(?<!_)_(?!_)(.*?)(?<!_)_(?!_)"),
|
||||
UNDERLINE_EM_RE,
|
||||
lambda m: self._apply_emphasis_spacing(
|
||||
m.string,
|
||||
m.start(),
|
||||
|
|
@ -679,8 +645,8 @@ class TextRenderer:
|
|||
),
|
||||
)
|
||||
|
||||
text = re.sub(r"(?<!\!)\[([^\]]+)\]\(([^)]+)\)", self._handle_link, text)
|
||||
text = re.sub(r"!\[([^\]]*)\]\(([^)]+)\)", self._handle_image, text)
|
||||
text = LINK_RE.sub(self._handle_link, text)
|
||||
text = IMAGE_RE.sub(self._handle_image, text)
|
||||
|
||||
for index, replacement in enumerate(emphasis_segments):
|
||||
placeholder = f"\u0000EMP{index}\u0000"
|
||||
|
|
@ -859,8 +825,7 @@ class TextRenderer:
|
|||
hyphenate: bool = False,
|
||||
) -> List[str]:
|
||||
style = style or BlockStyle()
|
||||
margin_left = min(max(style.margin_left, 0), self.width - 1)
|
||||
available_width = max(1, self._effective_width(style))
|
||||
margin_left, _, available_width = self._margins(style)
|
||||
|
||||
subsequent = initial_indent if subsequent_indent is None else subsequent_indent
|
||||
|
||||
|
|
@ -991,8 +956,7 @@ class TextRenderer:
|
|||
lines.append(initial_indent.rstrip())
|
||||
|
||||
result: List[str] = []
|
||||
margin_left = min(max(style.margin_left, 0), self.width - 1)
|
||||
width = available_width
|
||||
margin_left, _, width = self._margins(style)
|
||||
for line in lines:
|
||||
stripped = line.rstrip()
|
||||
line_len = len(stripped)
|
||||
|
|
@ -1031,10 +995,7 @@ class TextRenderer:
|
|||
return segments
|
||||
|
||||
def _effective_width(self, style: BlockStyle) -> int:
|
||||
margin_left = min(max(style.margin_left, 0), self.width - 1)
|
||||
remaining = self.width - margin_left
|
||||
margin_right = min(max(style.margin_right, 0), max(0, remaining - 1))
|
||||
return max(1, self.width - margin_left - margin_right)
|
||||
return self._margins(style)[2]
|
||||
|
||||
def _ensure_header_spacing(self) -> None:
|
||||
if self.header_spacing <= 0:
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue