67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
"""StaticRenderer 内部契约（契约 §10.4）。
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把「静态可视化」抽象为统一请求/协议：导出器只面向 StaticRenderer，不再直接调用
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``render_svg`` 等具体实现。后端当前仅能静态渲染函数图像；Mermaid 后端无渲染能力，
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返回占位结果交前端渲染。
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"""
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from __future__ import annotations
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from typing import Literal, Protocol
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from pydantic import BaseModel, Field
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from app.plot.model import FunctionPlot, FunctionPlotParseResult, StaticRenderResult
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from app.plot.parser import parse_source
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from app.plot.render import render_svg
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class StaticRenderRequest(BaseModel):
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"""一次静态渲染请求；source_hash 供缓存/去重，theme 供主题化渲染。"""
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kind: Literal["function_plot", "mermaid"]
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source: str
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source_hash: str = ""
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theme: str | None = None
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width: int | None = None
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height: int | None = None
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class StaticRenderer(Protocol):
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"""静态渲染器协议：请求 → 渲染结果（content 为可直接内嵌的标记）。"""
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def render(self, request: StaticRenderRequest) -> StaticRenderResult: ...
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class FunctionPlotStaticRenderer:
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"""函数图像渲染器：parse_source 解析 → render_svg 输出内嵌 SVG。
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``parse`` 与 ``render_plot`` 拆开，供导出器在渲染前先拿 node_count 做文档级
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累计复杂度预算、并消费解析诊断。
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"""
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def parse(self, request: StaticRenderRequest) -> FunctionPlotParseResult:
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return parse_source(request.source)
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def render(self, request: StaticRenderRequest) -> StaticRenderResult:
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parsed = self.parse(request)
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if parsed.plot is None:
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raise ValueError("function-plot source has no valid plot")
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return render_svg(parsed.plot, request.theme or 'light')
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def render_plot(self, plot: FunctionPlot) -> StaticRenderResult:
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return render_svg(plot)
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class MermaidStaticRenderer:
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"""Mermaid 后端无渲染能力：返回空占位结果，交前端渲染。"""
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def render(self, request: StaticRenderRequest) -> StaticRenderResult:
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return StaticRenderResult(
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content="",
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mime_type="text/plain",
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width=0,
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height=0,
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warnings=["mermaid 需前端渲染，已保留为占位代码块"],
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)
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