Plugin API: Implement the |passes| parameter for |PEG.compiler.compile|

The |passes| parameter will allow to pass the list of passes from
|PEG.buildParser|. This will be used by plugins. The old way via setting
the |appliedPassNames| property is removed.

Implements part of GH-106.

lib/compiler.js

@@ -16,27 +16,14 @@ module.exports = {
     generateJavascript:  require("./compiler/passes/generate-javascript")
   },
 
-  /*
-   * Names of passes that will get run during the compilation (in the specified
-   * order).
-   */
-  appliedPassNames: [
-    "reportMissingRules",
-    "reportLeftRecursion",
-    "removeProxyRules",
-    "generateBytecode",
-    "generateJavascript"
-  ],
-
   /*
    * Generates a parser from a specified grammar AST. Throws |PEG.GrammarError|
    * if the AST contains a semantic error. Note that not all errors are detected
    * during the generation and some may protrude to the generated parser and
    * cause its malfunction.
    */
-  compile: function(ast) {
+  compile: function(ast, passes) {
-    var that    = this,
+    var options = arguments.length > 2 ? utils.clone(arguments[2]) : {};
-        options = arguments.length > 1 ? utils.clone(arguments[1]) : {};
 
     utils.defaults(options, {
       allowedStartRules:  [ast.rules[0].name],
@@ -45,9 +32,7 @@ module.exports = {
       output:             "parser"
     });
 
-    utils.each(this.appliedPassNames, function(passName) {
+    utils.each(passes, function(p) { p(ast, options); });
-      that.passes[passName](ast, options);
-    });
 
     switch (options.output) {
       case "parser": return eval(ast.code);

lib/peg.js

@@ -1,3 +1,5 @@
+var utils = require("./utils");
+
 module.exports = {
   /* PEG.js version (uses semantic versioning). */
   VERSION: "0.7.0",
@@ -18,6 +20,10 @@ module.exports = {
    * generated parser and cause its malfunction.
    */
   buildParser: function(grammar, options) {
-    return this.compiler.compile(this.parser.parse(grammar), options);
+    return this.compiler.compile(
+      this.parser.parse(grammar),
+      utils.values(this.compiler.passes),
+      options
+    );
   }
 };