feat(htmlhint): add RegExp and regex string (#346)

RegExp and regex string can be used in whitelist now!
related to #228 #183 microsoft/vscode-htmlhint#34

src/rules/attr-lowercase.js

@@ -1,3 +1,43 @@
+/**
+ * testAgainstStringOrRegExp
+ * @param {string} value string to test
+ * @param {string|RegExp} comparison raw string or regex string
+ * @returns {boolean}
+ */
+function testAgainstStringOrRegExp(value, comparison) {
+  // If it's a RegExp, test directly
+  if (comparison instanceof RegExp) {
+    return comparison.test(value)
+      ? { match: value, pattern: comparison }
+      : false;
+  }
+
+  // Check if it's RegExp in a string
+  const firstComparisonChar = comparison[0];
+  const lastComparisonChar = comparison[comparison.length - 1];
+  const secondToLastComparisonChar = comparison[comparison.length - 2];
+
+  const comparisonIsRegex =
+    firstComparisonChar === '/' &&
+    (lastComparisonChar === '/' ||
+      (secondToLastComparisonChar === '/' && lastComparisonChar === 'i'));
+
+  const hasCaseInsensitiveFlag =
+    comparisonIsRegex && lastComparisonChar === 'i';
+
+  // If so, create a new RegExp from it
+  if (comparisonIsRegex) {
+    const valueMatches = hasCaseInsensitiveFlag
+      ? new RegExp(comparison.slice(1, -2), 'i').test(value)
+      : new RegExp(comparison.slice(1, -1)).test(value);
+
+    return valueMatches;
+  }
+
+  // Otherwise, it's a string. Do a strict comparison
+  return value === comparison;
+}
+
 export default {
   id: 'attr-lowercase',
   description: 'All attribute names must be in lowercase.',
@@ -12,7 +52,7 @@ export default {
         attr = attrs[i];
         var attrName = attr.name;
         if (
-          exceptions.indexOf(attrName) === -1 &&
+          !exceptions.find(exp => testAgainstStringOrRegExp(attrName, exp)) &&
           attrName !== attrName.toLowerCase()
         ) {
           reporter.error(

test/rules/attr-lowercase.spec.js

@@ -46,4 +46,18 @@ describe(`Rules: ${ruldId}`, function() {
     const messages = HTMLHint.verify(code, ruleOptions);
     expect(messages.length).to.be(0);
   });
+
+  it('Set to array list with RegExp should not result in an error', function() {
+    const code = '<p testBox="abc" bind:tapTop="ccc">';
+    ruleOptions[ruldId] = ['testBox', /bind:.*/];
+    const messages = HTMLHint.verify(code, ruleOptions);
+    expect(messages.length).to.be(0);
+  });
+
+  it('Set to array list with regex string should not result in an error', function() {
+    const code = '<p testBox="abc" [ngFor]="ccc">';
+    ruleOptions[ruldId] = ['testBox', '/\\[.*\\]/'];
+    const messages = HTMLHint.verify(code, ruleOptions);
+    expect(messages.length).to.be(0);
+  });
 });