Beginning to add some functionality to the parser

spec/parser/javascript_spec.js

@@ -1,7 +1,28 @@
-import parser from 'src/js/parser/javascript.peg';
+import parser from 'src/js/parser/javascript.js';
 
 describe('parser/javascript.peg', function() {
 
-  pending();
+  describe('regular expression literals', function() {
+
+    describe('flags support', function() {
+
+      it('handles the ignore case flag', function() {
+        expect(parser.parse('/test/i').flags().ignore_case).toEqual(true);
+        expect(parser.parse('/test/').flags().ignore_case).toEqual(false);
+      });
+
+      it('handles the global flag', function() {
+        expect(parser.parse('/test/g').flags().global).toEqual(true);
+        expect(parser.parse('/test/').flags().global).toEqual(false);
+      });
+
+      it('handles the multiline flag', function() {
+        expect(parser.parse('/test/m').flags().multiline).toEqual(true);
+        expect(parser.parse('/test/').flags().multiline).toEqual(false);
+      });
+
+    });
+
+  });
 
 });

src/js/main.js

@@ -1,3 +1,3 @@
-import parser from './parser/javascript.peg';
+import parser from './parser/javascript.js';
 
 window.parser = parser;

src/js/parser/javascript.js

@@ -0,0 +1,9 @@
+import parser from './javascript/grammar.peg';
+
+import Root from './javascript/root.js';
+import Regexp from './javascript/regexp.js';
+
+parser.Parser.Root = Root;
+parser.Parser.Regexp = Regexp;
+
+export default parser;

src/js/parser/javascript/grammar.peg

@@ -1,8 +1,7 @@
 grammar JavascriptRegexp
-  root <- regexp_literal / regexp
-  regexp_literal <- "/" regexp "/" [igm]*
-  regexp <- match ( "|" regexp )?
-  match <- anchor_start? ( ( subexp / charset  / terminal ) repeat? )* anchor_end?
+  root <- ( ( "/" regexp "/" fl:[igm]* ) / regexp ) <Root>
+  regexp <- match ( "|" regexp )? <Regexp>
+  match <- anchor_start? ( ( subexp / charset / terminal ) repeat? )* anchor_end?
   anchor_start <- "^"
   anchor_end <- "$"
   repeat <- ( repeat_any / repeat_required / repeat_optional / repeat_spec ) repeat_greedy?

src/js/parser/javascript/regexp.js

@@ -0,0 +1,9 @@
+export default {
+  matches() {
+    if (this.elements[1].regexp) {
+      return [this.match].concat(this.elements[1].regexp.matches());
+    } else {
+      return [this.match];
+    }
+  }
+};

src/js/parser/javascript/root.js

@@ -0,0 +1,25 @@
+export default {
+  flags() {
+    var flags;
+
+    if (this.fl) {
+      flags = this.fl.textValue;
+    } else {
+      flags = '';
+    }
+
+    return {
+      global: /g/.test(flags),
+      ignore_case: /i/.test(flags),
+      multiline: /m/.test(flags)
+    };
+  },
+
+  expression() {
+    if (this.regexp) {
+      return this.regexp;
+    } else {
+      return this;
+    }
+  }
+};