yxxandClaude Code
f49d1245a1
- 新增 app/plot 包：白名单表达式解析（ast 无 eval）+ FunctionPlot 模型 + 静态 SVG 渲染 - HtmlExporter 的 function_plot 节点解析并内嵌 SVG，解析失败回退占位并转诊断 - 新增 test_plot.py（13 个测试）覆盖表达式安全、指令解析、SVG 输出与导出链路集成 Co-Authored-By: Claude Code <noreply@anthropic.com>
140 lines
5.1 KiB
Python
140 lines
5.1 KiB
Python
"""Function Plot 的解析与静态 SVG 渲染测试。
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覆盖 parser 的白名单表达式（幂/隐式乘法/函数/常量）、拒绝项（属性访问、任意调用等）、
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parse_source 指令与回退，以及 render 的 SVG 输出与 HTML 导出链路集成。
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"""
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from __future__ import annotations
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import asyncio
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import math
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import pytest
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from app.contracts import ExportOptions
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from app.export.exporters.html import HtmlExporter
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from app.export.markdown import parse_document
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from app.plot.parser import PlotParseError, evaluate, parse_expression, parse_source
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from app.plot.render import render_svg
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# --------------------------------------------------------------------------- #
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# 表达式解析
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# --------------------------------------------------------------------------- #
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def test_parse_expression_power_and_implicit_multiplication() -> None:
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assert evaluate(parse_expression("x^2"), 3) == 9.0
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assert evaluate(parse_expression("2^3"), 0) == 8.0
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assert evaluate(parse_expression("2x+1"), 3) == 7.0
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assert evaluate(parse_expression("2(x+1)"), 3) == 8.0
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assert evaluate(parse_expression("(x+1)(x-1)"), 3) == 8.0
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def test_parse_expression_functions_and_constants() -> None:
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assert evaluate(parse_expression("sin(0)"), 0) == 0.0
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assert math.isclose(evaluate(parse_expression("sin(pi/2)"), 0), 1.0)
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assert math.isclose(evaluate(parse_expression("ln(e)"), 0), 1.0)
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assert evaluate(parse_expression("abs(-3)"), 0) == 3.0
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def test_parse_expression_rejects_unsafe() -> None:
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unsafe = [
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"os.system('x')",
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"__import__('os')",
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"foo(x)",
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"eval('x')",
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"x[0]",
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"x.attr",
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"lambda: 1",
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]
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for expr in unsafe:
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with pytest.raises(PlotParseError) as exc:
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parse_expression(expr)
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assert exc.value.diagnostic.code == "FUNCTION_PLOT_EXPRESSION_UNSAFE", expr
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def test_parse_expression_syntax_error() -> None:
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with pytest.raises(PlotParseError) as exc:
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parse_expression("x +")
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assert exc.value.diagnostic.code == "FUNCTION_PLOT_PARSE_FAILED"
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# --------------------------------------------------------------------------- #
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# fenced 源码解析
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# --------------------------------------------------------------------------- #
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def test_parse_source_directives() -> None:
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result = parse_source("domain: 0, 10\nrange: -1, 1\nxlabel: x\ngrid: false\ny = x^2")
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assert result.plot is not None
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assert result.plot.domain == (0.0, 10.0)
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assert result.plot.range == (-1.0, 1.0)
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assert result.plot.axes.xlabel == "x"
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assert result.plot.axes.grid is False
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assert len(result.plot.expressions) == 1
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assert result.plot.expressions[0].expression == "x^2"
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def test_parse_source_bare_and_multi_expression() -> None:
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result = parse_source("x^2\nsin(x)")
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assert result.plot is not None
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assert [e.expression for e in result.plot.expressions] == ["x^2", "sin(x)"]
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def test_parse_source_unknown_directive_warns() -> None:
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result = parse_source("foo: bar\ny = x")
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assert result.plot is not None # 未知指令仅 warning，不阻断
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assert any(d.severity == "warning" for d in result.diagnostics)
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def test_parse_source_error_returns_no_plot() -> None:
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result = parse_source("y = os.system('x')")
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assert result.plot is None
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assert any(d.severity == "error" for d in result.diagnostics)
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# --------------------------------------------------------------------------- #
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# SVG 渲染
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# --------------------------------------------------------------------------- #
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def test_render_svg_contains_polyline_and_axes() -> None:
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plot = parse_source("y = x^2").plot
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rendered = render_svg(plot)
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svg = rendered.content
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assert "<svg" in svg
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assert "<polyline" in svg
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assert "<line" in svg # 坐标轴/网格
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assert "<script" not in svg
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assert rendered.width == 640
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assert rendered.height == 480
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def test_render_svg_multiple_functions() -> None:
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plot = parse_source("y = x^2\ny = sin(x)").plot
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rendered = render_svg(plot)
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assert rendered.content.count("<polyline") >= 2
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def test_render_svg_labels() -> None:
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plot = parse_source("xlabel: 时间\nylabel: 数值\ny = x").plot
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rendered = render_svg(plot)
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assert "时间" in rendered.content
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assert "数值" in rendered.content
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# --------------------------------------------------------------------------- #
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# HTML 导出链路集成
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# --------------------------------------------------------------------------- #
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def test_html_exporter_embeds_function_plot_svg() -> None:
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md = "```function-plot\ny = x^2\n```"
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result = asyncio.run(HtmlExporter().export(parse_document(md), ExportOptions()))
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html = result.content.decode("utf-8")
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assert '<figure class="function-plot">' in html
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assert "<svg" in html
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assert "<polyline" in html
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def test_html_exporter_function_plot_fallback_on_error() -> None:
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md = "```function-plot\ny = os.system('x')\n```"
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result = asyncio.run(HtmlExporter().export(parse_document(md), ExportOptions()))
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html = result.content.decode("utf-8")
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assert '<pre class="function-plot">' in html
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assert "<svg" not in html
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assert any("函数图像" in w for w in result.warnings)
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