feat(coverage): class_references + scan_archive — each template-bearing file's class tokens (static class=/className=, Vue :class object/array/ternary, React className={…}, Svelte class:x) read in the same tar walk as definitions; the CSS consumer map's extractor (milestone 302 step 1, #2934)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_pattern_coverage.py

@@ -16,7 +16,10 @@ import pytest
 import pytest_asyncio
 
 from scribe.services.coverage import (
+    ArchiveScan,
+    class_references,
     coverage_line,
+    scan_archive,
     extract_shapes,
     largest_gaps,
     scannable,
@@ -118,6 +121,80 @@ def test_shapes_from_archive_strips_the_wrapper_and_gates_files():
     assert shapes_from_archive(_tarball(TREE)) == TREE_SHAPES
 
 
+# --- unit: template class references — the CSS consumer map (milestone 302) --
+
+
+def test_class_references_reads_vue_static_and_dynamic_forms_only():
+    """A template's class attributes name the classes it consumes: the static
+    `class=`, the Vue dynamic object/array/ternary forms (string literals and
+    bare object keys), never a selector in <style>, a `class Foo` in
+    <script>, a `querySelector('.x')`, or a look-alike attribute."""
+    vue = (
+        "<template>\n"
+        '  <div class="card card--wide" :class="{ active: isOpen, \'is-error\': err }">\n'
+        '    <span :class="[ \'pill\', cond ? \'pill-on\' : \'pill-off\', other ]" />\n'
+        '    <p class="card" v-bind:class="open ? openCls : \'closed\'">{{ t }}</p>\n'
+        '    <i data-class="nope" headerClass="nope2" />\n'
+        "  </div>\n"
+        "</template>\n"
+        '<script setup lang="ts">\n'
+        "class Foo {}\n"
+        "const el = document.querySelector('.zap')\n"
+        "</script>\n"
+        "<style scoped>\n"
+        ".card { color: red; }\n"
+        ".zap { color: blue; }\n"
+        "</style>\n"
+    )
+    assert class_references("a/B.vue", vue) == {
+        "card": 2, "card--wide": 1, "active": 1, "is-error": 1,
+        "pill": 1, "pill-on": 1, "pill-off": 1, "closed": 1,
+    }
+
+
+def test_class_references_reads_react_svelte_and_server_templates():
+    tsx = (
+        "export function X({ on }: { on: boolean }) {\n"
+        '  return <button className="btn btn-primary" data-x="y">\n'
+        "    <i className={on ? 'tab tab-on' : 'tab'} />\n"
+        "    <b className={`chip ${on ? 'chip-on' : ''} chip-sm`} />\n"
+        "    <u className={cn({ pill: on, 'pill-off': !on })} />\n"
+        "  </button>\n"
+        "}\n"
+    )
+    # A template literal's static text counts; its `${…}` hole is unknowable
+    # (chip-on sits inside the hole's own ternary and is NOT claimed).
+    assert class_references("a/x.tsx", tsx) == {
+        "btn": 1, "btn-primary": 1, "tab": 2, "tab-on": 1,
+        "chip": 1, "chip-sm": 1, "pill": 1, "pill-off": 1,
+    }
+    assert class_references("a/y.svelte", '<div class:active={on} class="row">') == {
+        "row": 1, "active": 1,
+    }
+    # A server-side interpolation contributes no token; a literal class inside
+    # a template conditional still does.
+    html = '<div class="row {{ cls }} col-2 {% if x %}y{% endif %}">'
+    assert class_references("t/p.html", html) == {"row": 1, "col-2": 1, "y": 1}
+    # Not a template-bearing file: nothing, however it reads.
+    assert class_references("a/z.py", 'html = \'<div class="row">\'') == {}
+
+
+def test_scan_archive_returns_definitions_and_references_from_one_walk():
+    tree = dict(TREE)
+    tree["web/Card.vue"] = (
+        b'<template><div class="btn card">x</div></template>\n'
+        b"<style scoped>\n.card {\n  color: red;\n}\n</style>\n"
+    )
+    scan = scan_archive(_tarball(tree))
+    assert isinstance(scan, ArchiveScan)
+    assert [(d.path, d.kind, d.name) for d in scan.definitions] == TREE_SHAPES + [
+        ("web/Card.vue", "css", "card"),
+    ]
+    # Only files whose markup names a class appear; the .py/.css files don't.
+    assert scan.references == {"web/Card.vue": {"btn": 1, "card": 1}}
+    assert shapes_from_archive(_tarball(tree)) == [(d.path, d.kind, d.name) for d in scan.definitions]
+
+
 # --- unit: the covering predicate (lives with the ledger since #2788) --------