Initial commit. Note that I'm using CommonJS modules and node purely to help me develop this. If this ends up being useful, I will likely distribute the entire package as a single JS file for easier consumption in the browser.

2010-11-25 00:48:55 -08:00
commit 85fa2cb65f
8 changed files with 383 additions and 0 deletions
@@ -0,0 +1,58 @@
+var Lexer = function() {};
+
+Lexer.prototype = {
+  setInput: function(input) {
+    this.input = input;
+    this.yylineno = 0;
+  },
+
+  setupLex: function() {
+    this.yyleng = 0;
+    this.yytext = '';
+  },
+
+  getchar: function(n) {
+    n = n || 1;
+    var char = "";
+
+    for(var i=0; i<n; i++) {
+      char += this.input[0];
+      this.yytext += this.input[0];
+      this.yyleng++;
+
+      if(char === "\n") this.yylineno++;
+
+      this.input = this.input.slice(1);
+    }
+    return char;
+  },
+
+  readchar: function(n) {
+    n = n || 1;
+    var char;
+
+    for(var i=0; i<n; i++) {
+      char = this.input[i];
+      if(char === "\n") this.yylineno++;
+    }
+
+    this.input = this.input.slice(n);
+  },
+
+  peek: function(n) {
+    return this.input.slice(0, n || 1);
+  }
+};
+
+var Visitor = function() {};
+
+Visitor.prototype = {
+  accept: function(object) {
+    return this[object.type](object);
+  }
+}
+
+if(exports) {
+  exports.Lexer = Lexer;
+  exports.Visitor = Visitor;
+}