yxxandClaude Code
04f36524b1
- P1 浮点刻度死循环：_ticks 改为有上限的整数索引推进并校验步长推进 - P2 求值异常：白名单函数校验参数数量；负数底非整数指数按断点处理；采样容错复数 - P2 无效纵轴范围：退化/非有限 range 丢弃并自动采样重算；渲染异常回退占位不阻断导出 - 补 6 个回归测试 Co-Authored-By: Claude Code <noreply@anthropic.com>
274 lines
13 KiB
Python
274 lines
13 KiB
Python
"""HtmlExporter：Document AST → 完整 HTML5 文档（内嵌基础 CSS）。
|
||
|
||
mermaid 等无法静态表达的节点渲染为占位代码块并记 warning，不静默丢失；function_plot
|
||
解析为静态 SVG 内嵌（解析失败回退占位并转诊断）；严重内容缺失由 service 层以
|
||
EXPORT_UNSUPPORTED_CONTENT 判定，本层只负责逐节点渲染。
|
||
"""
|
||
|
||
from __future__ import annotations
|
||
|
||
import html
|
||
from datetime import datetime
|
||
from urllib.parse import urlparse
|
||
|
||
from app.contracts import ExportOptions
|
||
from app.export.document import Document, DocumentNode, ExportResult
|
||
from app.plot.parser import parse_source
|
||
from app.plot.render import render_svg
|
||
|
||
_MERMAID_WARNING = "mermaid 需前端渲染，已保留为占位代码块"
|
||
_RAW_HTML_WARNING = "原始 HTML 已按纯文本转义保留"
|
||
|
||
# 链接/图片地址允许的协议；无 scheme 的相对地址视为安全，其余协议一律降级
|
||
_ALLOWED_URL_SCHEMES = frozenset({"http", "https", "mailto"})
|
||
|
||
|
||
def _safe_url(url: str) -> str | None:
|
||
"""校验 URL 协议；安全返回原串，不安全返回 None。"""
|
||
url = url.strip()
|
||
if not url:
|
||
return None
|
||
scheme = urlparse(url).scheme.lower()
|
||
if scheme and scheme not in _ALLOWED_URL_SCHEMES:
|
||
return None
|
||
return url
|
||
|
||
_BASE_CSS = """
|
||
body { margin: 0; background: #f6f7f9; color: #1f2328; font: 15px/1.7 -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif; }
|
||
article { max-width: 860px; margin: 0 auto; padding: 40px 48px; background: #fff; }
|
||
article.theme-dark { background: #0d1117; color: #c9d1d9; }
|
||
h1, h2, h3, h4, h5, h6 { line-height: 1.3; margin: 1.4em 0 0.6em; }
|
||
h1.title { margin-top: 0; }
|
||
p { margin: 0.6em 0; }
|
||
a { color: #0969da; }
|
||
code { font-family: 'JetBrains Mono', Consolas, monospace; font-size: 0.9em; background: #f0f1f3; padding: 0.15em 0.35em; border-radius: 3px; }
|
||
pre { background: #f6f8fa; padding: 14px 16px; border-radius: 6px; overflow-x: auto; }
|
||
pre.code-theme-github-dark { background: #0d1117; color: #c9d1d9; }
|
||
pre code { background: none; padding: 0; }
|
||
pre.mermaid, pre.function-plot { border: 1px dashed #d0d7de; }
|
||
figure.function-plot { margin: 1em 0; text-align: center; }
|
||
figure.function-plot svg { max-width: 100%; height: auto; }
|
||
blockquote { margin: 0.8em 0; padding: 0.2em 1em; border-left: 4px solid #d0d7de; color: #57606a; }
|
||
img { max-width: 100%; }
|
||
table { border-collapse: collapse; margin: 0.8em 0; }
|
||
th, td { border: 1px solid #d0d7de; padding: 6px 12px; }
|
||
th { background: #f6f8fa; }
|
||
dl.metadata { font-size: 0.85em; color: #57606a; border-top: 1px solid #eaeef2; border-bottom: 1px solid #eaeef2; padding: 0.6em 0; }
|
||
dl.metadata dt { display: inline; font-weight: 600; margin-right: 0.4em; }
|
||
dl.metadata dd { display: inline; margin: 0 1.2em 0 0; }
|
||
.math, .math-block { overflow-x: auto; padding: 0.4em 0; }
|
||
.task-list-item { list-style: none; }
|
||
.task-list-item input { margin-right: 0.4em; }
|
||
hr { border: none; border-top: 1px solid #d0d7de; margin: 1.4em 0; }
|
||
""".strip()
|
||
|
||
|
||
class HtmlExporter:
|
||
"""实现 DocumentExporter：递归渲染 Document AST 为完整 HTML5 文档。"""
|
||
|
||
def render(self, document: Document, options: ExportOptions) -> ExportResult:
|
||
"""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。"""
|
||
self._options = options
|
||
warnings: list[str] = []
|
||
body = self._render_children(document.children, warnings)
|
||
content = self._assemble(document, options, body, warnings)
|
||
return ExportResult(
|
||
content=content.encode("utf-8"), mime_type="text/html", warnings=warnings
|
||
)
|
||
|
||
async def export(self, document: Document, options: ExportOptions) -> ExportResult:
|
||
"""契约要求的 async 接口；渲染本身同步，直接转发到 render。"""
|
||
return self.render(document, options)
|
||
|
||
def _assemble(
|
||
self, document: Document, options: ExportOptions, body: str, warnings: list[str]
|
||
) -> str:
|
||
title = str(document.attributes.get("title") or "")
|
||
parts = [
|
||
"<!doctype html>",
|
||
'<html lang="zh-CN">',
|
||
"<head>",
|
||
'<meta charset="utf-8">',
|
||
'<meta name="viewport" content="width=device-width, initial-scale=1">',
|
||
]
|
||
if title:
|
||
parts.append(f"<title>{html.escape(title)}</title>")
|
||
parts.append(f"<style>{_BASE_CSS}</style>")
|
||
parts.append("</head>")
|
||
parts.append("<body>")
|
||
parts.append(f'<article class="theme-{html.escape(options.theme_id)}">')
|
||
if options.include_title and title:
|
||
parts.append(f'<h1 class="title">{html.escape(title)}</h1>')
|
||
if options.include_metadata:
|
||
metadata = document.attributes.get("metadata")
|
||
if metadata:
|
||
parts.append(self._render_metadata(metadata))
|
||
parts.append(body)
|
||
parts.append("</article>")
|
||
parts.append("</body>")
|
||
parts.append("</html>")
|
||
return "\n".join(parts) + "\n"
|
||
|
||
def _render_metadata(self, metadata: dict) -> str:
|
||
entries = ["<dl", ' class="metadata">']
|
||
for key, value in metadata.items():
|
||
entries.append(f"<dt>{html.escape(str(key))}</dt>")
|
||
entries.append(f"<dd>{html.escape(self._fmt_meta_value(value))}</dd>")
|
||
entries.append("</dl>")
|
||
return "".join(entries)
|
||
|
||
@staticmethod
|
||
def _fmt_meta_value(value: object) -> str:
|
||
if isinstance(value, datetime):
|
||
return value.isoformat()
|
||
if isinstance(value, list):
|
||
return ", ".join(str(item) for item in value)
|
||
return str(value)
|
||
|
||
def _render_children(self, children: list[DocumentNode], warnings: list[str]) -> str:
|
||
return "".join(self._render_node(child, warnings) for child in children)
|
||
|
||
def _render_node(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
handler = getattr(self, f"_render_{node.type}", None)
|
||
if handler is not None:
|
||
return handler(node, warnings)
|
||
warnings.append(f"无法表示的节点类型已跳过：{node.type}")
|
||
return ""
|
||
|
||
# --- 块级 ---
|
||
def _render_heading(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
level = max(1, min(6, int(node.attributes.get("level", 1))))
|
||
return f"<h{level}>{self._render_children(node.children, warnings)}</h{level}>"
|
||
|
||
def _render_paragraph(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f"<p>{self._render_children(node.children, warnings)}</p>"
|
||
|
||
def _render_blockquote(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f"<blockquote>{self._render_children(node.children, warnings)}</blockquote>"
|
||
|
||
def _render_list(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
tag = "ol" if node.attributes.get("ordered") else "ul"
|
||
return f"<{tag}>{self._render_children(node.children, warnings)}</{tag}>"
|
||
|
||
def _render_list_item(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
inner = self._render_children(node.children, warnings)
|
||
if node.attributes.get("task"):
|
||
checked = " checked" if node.attributes.get("checked") else ""
|
||
return (
|
||
'<li class="task-list-item">'
|
||
f'<input type="checkbox" disabled{checked}>{inner}</li>'
|
||
)
|
||
return f"<li>{inner}</li>"
|
||
|
||
def _render_table(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
rows = node.children
|
||
head_rows = [r for r in rows if r.attributes.get("head")]
|
||
body_rows = [r for r in rows if not r.attributes.get("head")]
|
||
parts = ["<table>"]
|
||
if head_rows:
|
||
parts.append("<thead>")
|
||
parts.extend(self._render_node(r, warnings) for r in head_rows)
|
||
parts.append("</thead>")
|
||
if body_rows:
|
||
parts.append("<tbody>")
|
||
parts.extend(self._render_node(r, warnings) for r in body_rows)
|
||
parts.append("</tbody>")
|
||
parts.append("</table>")
|
||
return "".join(parts)
|
||
|
||
def _render_table_row(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f"<tr>{self._render_children(node.children, warnings)}</tr>"
|
||
|
||
def _render_table_cell(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
tag = "th" if node.attributes.get("head") else "td"
|
||
return f"<{tag}>{self._render_children(node.children, warnings)}</{tag}>"
|
||
|
||
def _render_code_block(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
lang = str(node.attributes.get("language") or "")
|
||
code = html.escape(node.text)
|
||
lang_cls = f' class="language-{html.escape(lang)}"' if lang else ""
|
||
theme = html.escape(self._options.code_theme)
|
||
return f'<pre class="code-theme-{theme}"><code{lang_cls}>{code}</code></pre>'
|
||
|
||
def _render_thematic_break(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return "<hr>"
|
||
|
||
def _render_mermaid(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
warnings.append(_MERMAID_WARNING)
|
||
return f'<pre class="mermaid">{html.escape(node.text)}</pre>'
|
||
|
||
@staticmethod
|
||
def _format_plot_diagnostic(diag) -> str:
|
||
loc = f"（第 {diag.line} 行）" if diag.line else ""
|
||
return f"函数图像：{diag.message}{loc}"
|
||
|
||
def _render_function_plot(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
# 解析 fenced 源码：有合法 plot 且无 error → 内嵌静态 SVG；否则回退占位并转诊断
|
||
parsed = parse_source(node.text)
|
||
for diag in parsed.diagnostics:
|
||
warnings.append(self._format_plot_diagnostic(diag))
|
||
if parsed.plot is None:
|
||
return f'<pre class="function-plot">{html.escape(node.text)}</pre>'
|
||
try:
|
||
rendered = render_svg(parsed.plot)
|
||
except Exception as exc: # 渲染异常回退占位，绝不阻断整篇导出
|
||
warnings.append(f"函数图像：渲染失败，已回退占位（{exc}）")
|
||
return f'<pre class="function-plot">{html.escape(node.text)}</pre>'
|
||
warnings.extend(rendered.warnings)
|
||
return f'<figure class="function-plot">{rendered.content}</figure>'
|
||
|
||
def _render_math_block(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f'<div class="math-block">$${html.escape(node.text)}$$</div>'
|
||
|
||
def _render_html_block(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
# 原始 HTML 不可信，转义为纯文本展示，保证正文不丢且无注入风险
|
||
warnings.append(_RAW_HTML_WARNING)
|
||
return f'<div class="raw-html">{html.escape(node.text)}</div>'
|
||
|
||
# --- 行内 ---
|
||
def _render_text(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return html.escape(node.text)
|
||
|
||
def _render_emphasis(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f"<em>{self._render_children(node.children, warnings)}</em>"
|
||
|
||
def _render_strong(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f"<strong>{self._render_children(node.children, warnings)}</strong>"
|
||
|
||
def _render_link(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
inner = self._render_children(node.children, warnings)
|
||
href = str(node.attributes.get("href") or "")
|
||
safe_href = _safe_url(href)
|
||
if safe_href is None:
|
||
# 危险协议（如 javascript:）降级为纯文本，不输出可点击链接
|
||
warnings.append(f"链接协议不安全，已降级为纯文本：{href!r}")
|
||
return inner
|
||
title = str(node.attributes.get("title") or "")
|
||
attrs = [f'href="{html.escape(safe_href)}"']
|
||
if title:
|
||
attrs.append(f'title="{html.escape(title)}"')
|
||
return f"<a {' '.join(attrs)}>{inner}</a>"
|
||
|
||
def _render_codespan(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f"<code>{html.escape(node.text)}</code>"
|
||
|
||
def _render_image(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
src = str(node.attributes.get("src") or "")
|
||
alt = str(node.attributes.get("alt") or "")
|
||
safe_src = _safe_url(src)
|
||
if safe_src is None:
|
||
# 危险协议（如 data:/javascript:）跳过图片，仅输出 alt 文本
|
||
warnings.append(f"图片地址不安全，已跳过：{src!r}")
|
||
return html.escape(alt) if alt else ""
|
||
title = str(node.attributes.get("title") or "")
|
||
attrs = [f'src="{html.escape(safe_src)}"', f'alt="{html.escape(alt)}"']
|
||
if title:
|
||
attrs.append(f'title="{html.escape(title)}"')
|
||
return f"<img {' '.join(attrs)}>"
|
||
|
||
def _render_math_inline(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return f"\\({html.escape(node.text)}\\)"
|
||
|
||
def _render_linebreak(self, node: DocumentNode, warnings: list[str]) -> str:
|
||
return "<br>"
|