chore: generate metadata-function-map

.gitignore

@@ -18,6 +18,8 @@ test/integration/*/index.html
 axe.js
 axe.*.js
 
+# generated src file
+lib/core/base/metadata-function-map.js
 
 # generated jsdoc api docs
 doc/api/*

Gruntfile.js

@@ -106,6 +106,20 @@ module.exports = function(grunt) {
         ]
       }
     },
+    'metadata-function-map': {
+      core: {
+        files: [
+          {
+            expand: true,
+            src: [
+              'lib/checks/**/*-{evaluate,after}.js',
+              'lib/rules/**/*-matches.js'
+            ],
+            dest: 'lib/core/base/metadata-function-map.js'
+          }
+        ]
+      }
+    },
     'aria-supported': {
       data: {
         entry: 'lib/commons/aria/index.js',
@@ -239,6 +253,7 @@ module.exports = function(grunt) {
   grunt.registerTask('build', [
     'clean:core',
     'validate',
+    'metadata-function-map',
     'esbuild',
     'configure',
     'babel',

build/tasks/metadata-function-map.js

@@ -0,0 +1,49 @@
+const path = require('path').posix;
+const glob = require('glob');
+const fs = require('fs');
+
+function toTitleCase(str) {
+  return str.replace(/-\w/g, txt => {
+    return txt.charAt(1).toUpperCase() + txt.substr(2).toLowerCase();
+  });
+}
+
+module.exports = function(grunt) {
+  grunt.registerMultiTask(
+    'metadata-function-map',
+    'Task to generate the metadata-function-map file',
+    function() {
+      const files = grunt.task.current.data.files;
+
+      files.forEach(file => {
+        const src = Array.isArray(file.src) ? file.src : [file.src];
+        const map = {};
+        let outFile =
+          '// This file is automatically generated using build/tasks/metadata-function-map.js\n';
+
+        src.forEach(globPath => {
+          glob.sync(globPath).forEach(filePath => {
+            const relativePath = path.relative(
+              path.dirname(file.dest),
+              filePath
+            );
+            const filename = path.basename(filePath, '.js');
+            const functionName = toTitleCase(filename);
+
+            outFile += `import ${functionName} from '${relativePath}';\n`;
+            map[filename] = functionName;
+          });
+        });
+
+        outFile += `\nconst metadataFunctionMap = {\n`;
+        outFile += Object.keys(map)
+          .sort()
+          .map(key => `  '${key}': ${map[key]}`)
+          .join(',\n');
+        outFile += `\n};\n\nexport default metadataFunctionMap;`;
+
+        fs.writeFileSync(file.dest, outFile, 'utf-8');
+      });
+    }
+  );
+};