lexer tweak

[lambda.git] / code / parse.js

diff --git a/code/parse.js b/code/parse.js
index 6882d79..e3940b4 100644 (file)
--- a/code/parse.js
+++ b/code/parse.js
@@ -4,6 +4,9 @@
 //      http://javascript.crockford.com/tdop/index.html
 //      Douglas Crockford 2010-06-26
 
 //      http://javascript.crockford.com/tdop/index.html
 //      Douglas Crockford 2010-06-26
 

+//      See also http://effbot.org/zone/simple-top-down-parsing.htm
+
+

 /*jslint onevar: false
  */
 
 /*jslint onevar: false
  */
 


@@ -65,6 +68,7 @@ var make_parse = function () {
         }
     };
 
         }
     };
 

+       /*

        try {
                if (console && console.debug) {
                        function print() {
        try {
                if (console && console.debug) {
                        function print() {


@@ -72,6 +76,7 @@ var make_parse = function () {
                        }
                }
        } catch (e) {}
                        }
                }
        } catch (e) {}

+       */

 
     var symbol = function (id) {
         var s = symbol_table[id];
 
     var symbol = function (id) {
         var s = symbol_table[id];


@@ -228,9 +233,11 @@ var make_parse = function () {
                 return t;
             } else {
                 t.first = [];
                 return t;
             } else {
                 t.first = [];

-                while (token.arity === "name") {
-                    t.first.push(n);
-                    n = token;
+                while (token.arity === "name" || token.id === "\\") {
+                   if (token.id !== "\\") {
+                      t.first.push(n);
+                      n = token;
+                   }

                     advance();
                 }
                                if (token.arity === "literal" && t.first.length === 0) {
                     advance();
                 }
                                if (token.arity === "literal" && t.first.length === 0) {