PEG.buildParser now accepts grammars only in string format.

lib/compiler.js

@@ -11,32 +11,18 @@ function nop() {}
 /*
  * Generates a parser from a specified grammar and start rule and returns it.
  *
- * The grammar may be either an object or a string. If it is an object, it
- * must contain AST of the parsing expressions (i.e. instances of |PEG.Grammar.*
- * classes| for the grammar rules in its properties. If it is a string, it is
- * parsed using |PEG.grammarParser| to obtain the grammar AST and thus it must
- * be in a format that this parser accepts (see the source code for details).
+ * The grammar must be a string in the format described by the metagramar in the
+ * metagrammar.pegjs file. The start rule may be unspecified, in which case
+ * "start" is used.
  *
- * The start rule may be unspecified, in which case "start" is used.
- *
- * Throws |PEG.Grammar.GrammarError| if the grammar definition is not object nor
- * string or if it contains an error. Note that not all errors are detected
- * during the generation and some may protrude to the generated parser and cause
- * its malfunction.
+ * Throws |PEG.Grammar.GrammarError| if the grammar contains an error. Note that
+ * not all errors are detected during the generation and some may protrude to
+ * the generated parser and cause its malfunction.
  */
 PEG.buildParser = function(grammar, startRule) {
   startRule = startRule || "start";
 
-  switch (typeof(grammar)) {
-    case "object":
-      var ast = grammar;
-      break;
-    case "string":
-      var ast = PEG.grammarParser.parse(grammar);
-      break;
-    default:
-      throw new PEG.Grammar.GrammarError("Grammar must be object or string.");
-  }
+  var ast = PEG.grammarParser.parse(grammar);
 
   for (var key in ast) {
     ast[key].checkReferencedRulesExist(ast);

test/compiler-test.js

@@ -169,17 +169,9 @@ test("generateUniqueIdentifier", function() {
 
 module("PEG");
 
-test("buildParser reports invalid grammar object", function() {
-  throws(
-    function() { PEG.buildParser(42); },
-    PEG.Grammar.GrammarError,
-    { message: "Grammar must be object or string." }
-  );
-});
-
 test("buildParser reports missing start rule", function() {
   throws(
-    function() { PEG.buildParser({}); },
+    function() { PEG.buildParser('notStart: "abcd"'); },
     PEG.Grammar.GrammarError,
     { message: "Missing \"start\" rule." }
   );