418 lines
18 KiB
Python
418 lines
18 KiB
Python
"""DocxExporter：Document AST → DOCX（python-docx）。
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标题、段落、列表、表格等使用原生 Word 元素；函数图、已准备的 Mermaid、
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受支持的公式与 Vault 图片使用静态图片，无法表示的资源保留源码并记 warning。中文字体通过 Normal 样式挂载
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w:eastAsia=宋体，保证 Word 打开时中文正常显示；bold/italic 由 Word 原生渲染。
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"""
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from __future__ import annotations
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from io import BytesIO
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from docx import Document as DocxDocument
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from docx.enum.text import WD_ALIGN_PARAGRAPH
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from docx.opc.constants import RELATIONSHIP_TYPE
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from docx.oxml import OxmlElement
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from docx.oxml.ns import qn
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from docx.shared import Inches, Mm, Pt, RGBColor
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from app.contracts import ExportOptions
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from app.export.themes import CALLOUTS, print_theme_warning
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from app.export.document import Document, DocumentNode, ExportResult
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from app.export.exporters._common import (
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MERMAID_WARNING,
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PLOT_PLACEHOLDER_WARNING,
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RAW_HTML_WARNING,
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format_meta_value,
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safe_url,
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)
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_MIME = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
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_HEADING_SIZES = {1: 20, 2: 16, 3: 14, 4: 12, 5: 11, 6: 10.5}
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def _plain_text(children: list[DocumentNode]) -> str:
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"""递归拼接行内节点的纯文本，供标题/链接文字等需要纯文本处使用。"""
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parts: list[str] = []
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for child in children:
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if child.type == "text":
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parts.append(child.text)
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elif child.children:
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parts.append(_plain_text(child.children))
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elif child.text:
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parts.append(child.text)
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return "".join(parts)
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class DocxExporter:
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"""实现 DocumentExporter：递归渲染 Document AST 为 DOCX 字节流。"""
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def render(self, document: Document, options: ExportOptions) -> ExportResult:
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"""同步渲染；CPU 密集，调用方应放入线程执行，避免阻塞事件循环。"""
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from app.export.exporters._common import FunctionPlotBudget
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self._plot_budget = FunctionPlotBudget()
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self._doc = DocxDocument()
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self._configure_normal_style()
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self._configure_page(options)
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warnings: list[str] = []
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print_theme_warning(options, warnings, "DOCX")
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self._render_header(document, options, warnings)
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self._render_children(document.children, warnings)
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buf = BytesIO()
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self._doc.save(buf)
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return ExportResult(content=buf.getvalue(), mime_type=_MIME, warnings=warnings)
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async def export(self, document: Document, options: ExportOptions) -> ExportResult:
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"""契约要求的 async 接口；渲染本身同步，直接转发到 render。"""
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return self.render(document, options)
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def _configure_normal_style(self) -> None:
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"""Normal 样式挂载 CJK 字体；拉丁用 Calibri，中文用宋体。"""
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style = self._doc.styles["Normal"]
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style.font.name = "Calibri"
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style.font.size = Pt(11)
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rfonts = style.element.get_or_add_rPr().get_or_add_rFonts()
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rfonts.set(qn("w:eastAsia"), "宋体")
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def _configure_page(self, options: ExportOptions) -> None:
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section = self._doc.sections[0]
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size = (options.page_size or "A4").lower()
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if size == "a4":
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section.page_width = Mm(210)
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section.page_height = Mm(297)
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elif size == "letter":
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section.page_width = Inches(8.5)
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section.page_height = Inches(11)
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# --- 文档头部 ---
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def _render_header(self, document: Document, options: ExportOptions, warnings: list[str]) -> None:
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title = str(document.attributes.get("title") or "")
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if options.include_title and title:
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p = self._doc.add_paragraph()
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run = p.add_run(title)
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run.bold = True
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run.font.size = Pt(22)
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p.paragraph_format.space_after = Pt(12)
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if options.include_metadata:
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metadata = document.attributes.get("metadata")
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if metadata:
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for key, value in metadata.items():
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p = self._doc.add_paragraph()
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run = p.add_run(f"{key}: {format_meta_value(value)}")
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run.font.size = Pt(9)
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run.font.color.rgb = RGBColor(0x57, 0x60, 0x6A)
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# --- 块级 ---
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def _render_children(self, children: list[DocumentNode], warnings: list[str]) -> None:
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for child in children:
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self._render_block(child, warnings)
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def _render_block(self, node: DocumentNode, warnings: list[str]) -> None:
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if node.attributes.get('static_png'):
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from PIL import Image
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png = node.attributes['static_png']
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with Image.open(BytesIO(png)) as image:
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section = self._doc.sections[-1]
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available_width = (section.page_width - section.left_margin - section.right_margin) / 914400
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# 为 Word 外层段落的行高和间距预留空间，避免图片跨出页面。
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available_height = (section.page_height - section.top_margin - section.bottom_margin) / 914400 - 0.25
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width = min(5.8, available_width,
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image.width / (180 if node.type == 'math_block' else 96),
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available_height * image.width / image.height)
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self._doc.add_picture(BytesIO(png), width=Inches(width))
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return
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handler = getattr(self, f"_block_{node.type}", None)
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if handler is not None:
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handler(node, warnings)
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else:
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warnings.append(f"无法表示的节点类型已跳过：{node.type}")
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def _block_heading(self, node: DocumentNode, warnings: list[str]) -> None:
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level = max(1, min(6, int(node.attributes.get("level", 1))))
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p = self._doc.add_paragraph()
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run = p.add_run(_plain_text(node.children))
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run.bold = True
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run.font.size = Pt(_HEADING_SIZES[level])
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p.paragraph_format.space_before = Pt(14 if level <= 2 else 10)
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p.paragraph_format.space_after = Pt(6)
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def _block_paragraph(self, node: DocumentNode, warnings: list[str]) -> None:
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p = self._doc.add_paragraph()
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self._render_inline(p, node.children, warnings)
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def _block_callout(self, node, warnings):
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icon, color = CALLOUTS[node.attributes['kind']]
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p = self._doc.add_paragraph()
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p.add_run(icon+' ')
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self._render_inline(p,node.children[0].children,warnings)
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for run in p.runs:
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run.bold = True
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run.font.color.rgb = RGBColor.from_string(color[1:])
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shading = OxmlElement('w:shd')
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shading.set(qn('w:fill'),'F6F8FA')
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p._p.get_or_add_pPr().append(shading)
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self._render_children(node.children[1:],warnings)
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def _block_blockquote(self, node: DocumentNode, warnings: list[str]) -> None:
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# 引用块的直接子节点是块级节点（paragraph/list 等），不能交给行内渲染器，
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# 否则正文会被当作「无法表示的行内节点」丢弃；逐个渲染并继承引用缩进/颜色。
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for child in node.children:
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if child.type == "paragraph":
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p = self._doc.add_paragraph()
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self._render_inline(p, child.children, warnings)
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p.paragraph_format.left_indent = Pt(16)
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for run in p.runs:
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run.font.color.rgb = RGBColor(0x57, 0x60, 0x6A)
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elif child.type == "list":
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self._block_list(child, warnings, level=1, color=RGBColor(0x57, 0x60, 0x6A))
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else:
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self._render_block(child, warnings)
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def _block_list(
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self,
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node: DocumentNode,
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warnings: list[str],
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level: int = 0,
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color: RGBColor | None = None,
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) -> None:
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ordered = bool(node.attributes.get("ordered"))
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for index, item in enumerate(node.children, start=1):
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self._block_list_item(item, warnings, ordered, index, level, color)
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def _block_list_item(
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self,
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item: DocumentNode,
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warnings: list[str],
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ordered: bool,
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index: int,
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level: int,
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color: RGBColor | None = None,
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) -> None:
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if item.attributes.get("task"):
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marker = "☑ " if item.attributes.get("checked") else "☐ "
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else:
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marker = f"{index}. " if ordered else "• "
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indent = Pt(18 + 18 * level)
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first = True
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for child in item.children:
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if child.type == "list":
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self._block_list(child, warnings, level + 1, color)
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continue
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if child.type != "paragraph" and hasattr(self, f"_block_{child.type}"):
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if first:
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marker_p = self._doc.add_paragraph()
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marker_p.paragraph_format.left_indent = indent
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self._add_run(marker_p, marker)
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first = False
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before = len(self._doc.paragraphs)
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before_tables = len(self._doc.tables)
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self._render_block(child, warnings)
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for nested_p in self._doc.paragraphs[before:]:
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current = nested_p.paragraph_format.left_indent or 0
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nested_p.paragraph_format.left_indent = current + indent
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for table in self._doc.tables[before_tables:]:
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table_indent = table._tbl.tblPr.find(qn("w:tblInd"))
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if table_indent is None:
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table_indent = OxmlElement("w:tblInd")
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table._tbl.tblPr.append(table_indent)
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current_twips = int(table_indent.get(qn("w:w"), "0"))
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table_indent.set(qn("w:w"), str(current_twips + indent.twips))
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table_indent.set(qn("w:type"), "dxa")
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continue
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p = self._doc.add_paragraph()
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p.paragraph_format.left_indent = indent
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if first:
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self._add_run(p, marker)
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first = False
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if child.type == "paragraph":
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# 块级容器：展开其行内子节点
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self._render_inline(p, child.children, warnings)
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else:
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# 直接行内节点（text/strong/emphasis/link/codespan 等）：走行内渲染保留
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# 语义（加粗/斜体/超链接），不能只渲染其 children 而丢掉格式。
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self._render_inline_node(p, child, warnings)
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if color is not None:
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for run in p.runs:
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run.font.color.rgb = color
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def _block_table(self, node: DocumentNode, warnings: list[str]) -> None:
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rows = node.children
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ncols = max((len(r.children) for r in rows), default=0)
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if not rows or ncols == 0:
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return
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table = self._doc.add_table(rows=len(rows), cols=ncols)
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table.style = "Table Grid"
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for ri, row in enumerate(rows):
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head = bool(row.attributes.get("head"))
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for ci in range(ncols):
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cell = table.cell(ri, ci)
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p = cell.paragraphs[0]
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if ci < len(row.children):
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self._render_inline(p, row.children[ci].children, warnings, bold=head)
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def _block_code_block(self, node: DocumentNode, warnings: list[str]) -> None:
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lines = node.text.split("\n")
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p = self._doc.add_paragraph()
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self._shade_paragraph(p)
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p.paragraph_format.left_indent = Pt(8)
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p.paragraph_format.right_indent = Pt(8)
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p.paragraph_format.space_before = Pt(6)
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p.paragraph_format.space_after = Pt(8)
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for i, line in enumerate(lines):
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run = p.add_run(line)
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run.font.name = "Consolas"
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run.font.size = Pt(10)
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if i < len(lines) - 1:
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run.add_break()
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def _block_thematic_break(self, node: DocumentNode, warnings: list[str]) -> None:
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p = self._doc.add_paragraph()
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pPr = p._p.get_or_add_pPr()
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pBdr = OxmlElement("w:pBdr")
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bottom = OxmlElement("w:bottom")
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bottom.set(qn("w:val"), "single")
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bottom.set(qn("w:sz"), "6")
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bottom.set(qn("w:space"), "1")
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bottom.set(qn("w:color"), "D0D7DE")
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pBdr.append(bottom)
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pPr.append(pBdr)
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def _block_mermaid(self, node: DocumentNode, warnings: list[str]) -> None:
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warnings.append(MERMAID_WARNING)
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self._block_code_block(node, warnings)
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def _block_function_plot(self, node: DocumentNode, warnings: list[str]) -> None:
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from app.plot.parser import parse_source
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from app.export.assets import plot_png
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over = self._plot_budget.check_count()
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if not over:
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parsed = parse_source(node.text)
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warnings.extend(d.message for d in parsed.diagnostics)
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if parsed.plot:
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over = self._plot_budget.check_nodes(parsed.plot.node_count)
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if not over:
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png, messages = plot_png(parsed.plot)
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warnings.extend(messages)
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self._doc.add_picture(BytesIO(png), width=Inches(5.8))
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return
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warnings.append(over or '函数图像无法绘制，已保留源码')
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self._block_code_block(node, warnings)
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def _block_math_block(self, node: DocumentNode, warnings: list[str]) -> None:
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p = self._doc.add_paragraph()
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p.alignment = WD_ALIGN_PARAGRAPH.CENTER
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p.add_run(f"$${node.text}$$")
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def _block_html_block(self, node: DocumentNode, warnings: list[str]) -> None:
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# 原始 HTML 不可信，按纯文本保留正文
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warnings.append(RAW_HTML_WARNING)
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self._doc.add_paragraph(node.text)
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# --- 行内（写入 run） ---
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def _render_inline(
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self,
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paragraph,
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children: list[DocumentNode],
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warnings: list[str],
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bold: bool = False,
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italic: bool = False,
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) -> None:
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for child in children:
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self._render_inline_node(paragraph, child, warnings, bold, italic)
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def _render_inline_node(
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self,
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paragraph,
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node: DocumentNode,
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warnings: list[str],
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bold: bool = False,
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italic: bool = False,
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) -> None:
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if node.attributes.get('static_png'):
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from PIL import Image
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with Image.open(BytesIO(node.attributes['static_png'])) as image:
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width = min(5.8, image.width / (180 if node.type.startswith('math') else 96))
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paragraph.add_run().add_picture(BytesIO(node.attributes['static_png']), width=Inches(width))
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return
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t = node.type
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if t == "text":
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self._add_run(paragraph, node.text, bold=bold, italic=italic)
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elif t == "strong":
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self._render_inline(paragraph, node.children, warnings, bold=True, italic=italic)
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elif t == "emphasis":
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self._render_inline(paragraph, node.children, warnings, bold=bold, italic=True)
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elif t == "codespan":
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self._add_run(paragraph, node.text, code=True)
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elif t == "link":
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inner = _plain_text(node.children)
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href = str(node.attributes.get("href") or "")
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safe_href = safe_url(href)
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if safe_href is None:
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warnings.append(f"链接协议不安全，已降级为纯文本：{href!r}")
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self._render_inline(paragraph, node.children, warnings, bold, italic)
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else:
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self._add_hyperlink(paragraph, safe_href, inner)
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elif t == "image":
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src = str(node.attributes.get("src") or "")
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alt = str(node.attributes.get("alt") or "")
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if safe_url(src) is None:
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warnings.append(f"图片地址不安全，已跳过：{src!r}")
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else:
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warnings.append("图片未内嵌到 DOCX，已用替代文本表示")
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if alt:
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self._add_run(paragraph, alt)
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elif t == "math_inline":
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self._add_run(paragraph, f"\\({node.text}\\)")
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elif t == "linebreak":
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self._add_run(paragraph, "").add_break()
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else:
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warnings.append(f"无法表示的行内节点已跳过：{t}")
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def _add_run(self, paragraph, text: str, bold: bool = False, italic: bool = False, code: bool = False):
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run = paragraph.add_run(text)
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run.bold = bold
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run.italic = italic
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if code:
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run.font.name = "Consolas"
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run.font.size = Pt(10)
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return run
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def _add_hyperlink(self, paragraph, url: str, text: str) -> None:
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"""写入可点击的超链接 run（python-docx 无公开 API，需手写 w:hyperlink）。"""
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part = paragraph.part
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r_id = part.relate_to(url, RELATIONSHIP_TYPE.HYPERLINK, is_external=True)
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hyperlink = OxmlElement("w:hyperlink")
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hyperlink.set(qn("r:id"), r_id)
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run = OxmlElement("w:r")
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rPr = OxmlElement("w:rPr")
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rFonts = OxmlElement("w:rFonts")
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rFonts.set(qn("w:ascii"), "Calibri")
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rFonts.set(qn("w:hAnsi"), "Calibri")
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rFonts.set(qn("w:eastAsia"), "宋体")
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rPr.append(rFonts)
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color = OxmlElement("w:color")
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color.set(qn("w:val"), "0969DA")
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rPr.append(color)
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u = OxmlElement("w:u")
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u.set(qn("w:val"), "single")
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rPr.append(u)
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run.append(rPr)
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t = OxmlElement("w:t")
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t.text = text
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t.set(qn("xml:space"), "preserve")
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run.append(t)
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hyperlink.append(run)
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paragraph._p.append(hyperlink)
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def _shade_paragraph(self, paragraph, fill: str = "F2F2F2") -> None:
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"""给段落加浅灰底纹，用于代码块占位。"""
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pPr = paragraph._p.get_or_add_pPr()
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shd = OxmlElement("w:shd")
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shd.set(qn("w:val"), "clear")
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shd.set(qn("w:color"), "auto")
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shd.set(qn("w:fill"), fill)
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pPr.append(shd)
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