Add a multi-language CRAP tool that writes .metrics/crap.edn for uml-viewer.

Score Clojure, Java, Go, TypeScript, Rust, and Python with each language's complexity rules and coverage report.
2026-11-06 18:13:50 +00:00 · 2026-09-30 08:21:44 -05:00
commit a4b5fc2aed
33 changed files with 3913 additions and 0 deletions
@@ -0,0 +1,137 @@
+from crapper.coverage import (
+    CoverageBundle,
+    go_percent,
+    load_bundle,
+    parse_form_coverage,
+    parse_go_profile,
+    parse_jacoco_index,
+    parse_lcov,
+)
+from crapper.model import Function
+
+
+def function(**kwargs):
+    defaults = dict(
+        name="choose",
+        namespace="demo.core",
+        complexity=2,
+        start_line=3,
+        end_line=5,
+        path="src/demo/core.clj",
+        language="clojure",
+        jacoco_class=None,
+    )
+    defaults.update(kwargs)
+    return Function(**defaults)
+
+
+def test_cloverage_form_counts_and_lcov_lines():
+    html = '<span class="pc" title="1 out of 2 forms covered">   4&nbsp;&nbsp;(if x 1)</span>'
+    assert parse_form_coverage(html) == {4: (1, 2)}
+    lcov = "SF:src/demo/core.clj\nDA:3,1\nDA:4,0\nDA:9,3\nend_of_record\n"
+    parsed = parse_lcov(lcov)
+    bundle = CoverageBundle(lcov=parsed, form_html={"src/demo/core.clj": {4: (1, 2)}})
+    # Form HTML wins over LCOV for Clojure, matching crap4clj.
+    assert bundle.percent_for(function(start_line=3, end_line=5)) == 50.0
+
+
+def test_lcov_percentage_when_there_is_no_html():
+    lcov = parse_lcov("SF:src/demo/core.clj\nDA:3,1\nDA:4,0\nend_of_record\n")
+    bundle = CoverageBundle(lcov=lcov)
+    assert bundle.percent_for(function(start_line=3, end_line=4)) == 50.0
+    assert bundle.percent_for(function(path="src/missing.clj")) is None
+
+
+def test_go_profile_matches_crap4go_statement_ranges():
+    profile = parse_go_profile(
+        "mode: set\ngithub.com/acme/demo/board.go:4.1,6.2 2 1\ngithub.com/acme/demo/board.go:8.1,9.2 1 0\n"
+    )
+    assert go_percent(profile, "board.go", 4, 6) == 100.0
+    assert go_percent(profile, "board.go", 8, 9) == 0.0
+    assert go_percent(profile, "other.go", 1, 3) is None
+
+
+def test_jacoco_instruction_coverage_joins_on_class_and_method():
+    xml = """<?xml version="1.0"?>
+    <report>
+      <package>
+        <class name="demo/pkg/Board">
+          <method name="place" line="4">
+            <counter type="INSTRUCTION" missed="1" covered="3"/>
+          </method>
+        </class>
+        <class name="demo/pkg/Board$Inner">
+          <method name="tick" line="9">
+            <counter type="INSTRUCTION" missed="0" covered="2"/>
+          </method>
+        </class>
+      </package>
+    </report>
+    """
+    bundle = CoverageBundle(jacoco=parse_jacoco_index(xml))
+    outer = function(
+        name="place",
+        namespace="demo.pkg.Board",
+        language="java",
+        jacoco_class="demo.pkg.Board",
+        start_line=4,
+        path="src/demo/pkg/Board.java",
+    )
+    inner = function(
+        name="tick",
+        namespace="demo.pkg.Board.Inner",
+        language="java",
+        jacoco_class="demo.pkg.Board$Inner",
+        start_line=9,
+        path="src/demo/pkg/Board.java",
+    )
+    assert bundle.percent_for(outer) == 75.0
+    assert bundle.percent_for(inner) == 100.0
+
+
+def test_jacoco_skips_methods_without_an_instruction_counter():
+    xml = """<report>
+      <class name="demo/pkg/Board">
+        <method name="skip" line="2">
+          <counter type="LINE" missed="1" covered="0"/>
+        </method>
+        <method name="bad" line="nope">
+          <counter type="INSTRUCTION" missed="1" covered="1"/>
+        </method>
+        <counter type="INSTRUCTION" missed="0" covered="1"/>
+      </class>
+    </report>"""
+    found = parse_jacoco_index(xml)
+    assert list(found) == ["demo.pkg.Board#bad"]
+    assert found["demo.pkg.Board#bad"][0].line == 0
+
+
+def test_missing_go_profile_is_na():
+    assert go_percent(None, "board.go", 1, 3) is None
+
+
+def test_load_bundle_merges_each_report(tmp_path):
+    lcov = tmp_path / "target" / "coverage" / "lcov.info"
+    lcov.parent.mkdir(parents=True)
+    lcov.write_text("SF:src/demo/core.clj\nDA:3,1\nDA:4,0\nend_of_record\n", encoding="utf-8")
+    go = tmp_path / "target" / "coverage" / "go" / "coverage.out"
+    go.parent.mkdir(parents=True)
+    go.write_text("mode: set\nboard.go:1.1,2.2 1 1\n", encoding="utf-8")
+    jacoco = tmp_path / "target" / "site" / "jacoco" / "jacoco.xml"
+    jacoco.parent.mkdir(parents=True)
+    jacoco.write_text(
+        '<report><class name="demo/Board"><method name="place" line="4">'
+        '<counter type="INSTRUCTION" missed="0" covered="1"/></method></class></report>',
+        encoding="utf-8",
+    )
+    html = tmp_path / "target" / "coverage" / "src" / "demo" / "core.clj.html"
+    html.parent.mkdir(parents=True)
+    html.write_text(
+        '<span title="1 out of 2 forms covered">   4&nbsp;&nbsp;(if x 1)</span>',
+        encoding="utf-8",
+    )
+    (tmp_path / "target" / "coverage" / "index.html").write_text("<html></html>", encoding="utf-8")
+    bundle = load_bundle(tmp_path)
+    assert bundle.percent_for(function(start_line=3, end_line=4)) == 50.0
+    assert bundle.go_profile is not None
+    assert bundle.jacoco is not None