yxxandClaude Code
b87f94551b
- P2 复杂表达式绕过异常回退：解析与渲染共同纳入局部异常回退； AST 深度/节点数上限拦截 RecursionError - P2 极端有限范围生成 nan SVG：校验坐标跨度有限且 >0，回退安全范围； _polyline 拒绝非有限像素坐标 - P3 更新接口契约文档：function-plot 静态 SVG 已实现 Co-Authored-By: Claude Code <noreply@anthropic.com>
250 lines
9.7 KiB
Python
250 lines
9.7 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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# --------------------------------------------------------------------------- #
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# 审阅回归：浮点刻度 / 求值异常 / 无效范围
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# --------------------------------------------------------------------------- #
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def test_render_svg_huge_domain_ticks_bounded() -> None:
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# P1：巨大 domain 下步长受浮点精度限制无法推进，刻度应有限而非死循环
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plot = parse_source("domain: 10000000000000000, 10000000000000002\nrange: -1, 1\ny = 0").plot
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rendered = render_svg(plot)
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assert "<svg" in rendered.content
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def test_parse_expression_rejects_wrong_arg_count() -> None:
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# P2：sin() / sin(1, 2) 应在解析期拒绝，而非求值期 TypeError
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with pytest.raises(PlotParseError):
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parse_expression("sin()")
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with pytest.raises(PlotParseError):
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parse_expression("sin(1, 2)")
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def test_render_svg_nonreal_samples_are_break_points() -> None:
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# P2：x^0.5 在负数域产生复数，应作为断点处理，正半轴仍可绘制
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plot = parse_source("domain: -4, 4\ny = x^0.5").plot
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rendered = render_svg(plot)
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assert "<polyline" in rendered.content
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def test_render_svg_invalid_range_falls_back() -> None:
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# P2：退化 range（1, 1）应丢弃并自动采样，而非 ZeroDivisionError
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plot = parse_source("range: 1, 1\ny = x").plot
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rendered = render_svg(plot)
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assert "<polyline" in rendered.content
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assert any("range" in w for w in rendered.warnings)
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def test_render_svg_nonfinite_range_falls_back() -> None:
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# P2：非有限 range 端点应丢弃并自动采样
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plot = parse_source("range: nan, 1\ny = x").plot
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rendered = render_svg(plot)
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assert "<polyline" in rendered.content
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def test_html_exporter_function_plot_render_error_falls_back(monkeypatch) -> None:
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# P2：渲染异常不阻断整篇导出，回退占位并记 warning
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import app.export.exporters.html as html_mod
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def boom(plot):
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raise RuntimeError("boom")
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monkeypatch.setattr(html_mod, "render_svg", boom)
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md = "```function-plot\ny = 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 any("渲染失败" in w for w in result.warnings)
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# --------------------------------------------------------------------------- #
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# 审阅回归：复杂表达式 / 极端数值范围
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# --------------------------------------------------------------------------- #
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def test_parse_expression_rejects_excessive_depth() -> None:
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# P2：超长加法链的 AST 深度超限，应拒绝为 PlotParseError 而非触发 RecursionError
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expr = "+".join(["1"] * 300)
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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"
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def test_parse_expression_rejects_excessive_nodes() -> None:
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# P2：浅层但节点超限的表达式（满二叉树）应被节点数上限拦截
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def balanced(depth: int) -> str:
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if depth == 0:
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return "x"
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return f"({balanced(depth - 1)}+{balanced(depth - 1)})"
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expr = balanced(10) # ~2047 个节点，深度仅 ~10
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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"
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def test_html_exporter_function_plot_deep_expression_falls_back() -> None:
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# P2：复杂表达式解析失败应回退占位，不阻断整篇导出
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expr = "+".join(["1"] * 300)
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md = f"```function-plot\ny = {expr}\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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def test_render_svg_extreme_domain_no_nan() -> None:
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# P2：有限但跨度溢出的 domain 应回退安全范围，SVG 不得含 nan/inf
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plot = parse_source("domain: -1e308, 1e308\nrange: -1, 1\ny = 0").plot
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rendered = render_svg(plot)
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assert "<svg" in rendered.content
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assert "nan" not in rendered.content
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assert "inf" not in rendered.content
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assert any("domain" in w for w in rendered.warnings)
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def test_render_svg_extreme_range_no_nan() -> None:
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# P2：有限但跨度溢出的 range 应回退自动范围，SVG 不得含 nan/inf
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plot = parse_source("domain: -1, 1\nrange: -1e308, 1e308\ny = x").plot
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rendered = render_svg(plot)
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assert "<svg" in rendered.content
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assert "nan" not in rendered.content
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assert "inf" not in rendered.content
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assert any("range" in w for w in rendered.warnings)
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