Fix quoting situation around fields

lib/carto/parser.js

@@ -419,7 +419,7 @@ carto.Parser = function Parser(env) {
                     if (input.charAt(i) !== '"' && input.charAt(i) !== "'") return;
                     var str = $(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/);
                     if (str) {
-                        return new tree.Quoted(str[0], str[1] || str[2]);
+                        return new tree.Quoted(true, str[1] || str[2]);
                     }
                 },
 
@@ -481,13 +481,15 @@ carto.Parser = function Parser(env) {
                         return new tree.Call(name, args, i); 
                     }
                 },
-                arguments: function() {
+                // Arguments are comma-separated expressions
+                'arguments': function() {
                     var args = [], arg;
 
                     while (arg = $(this.expression)) {
                         args.push(arg);
                         if (! $(',')) { break; }
                     }
+
                     return args;
                 },
                 literal: function() {
@@ -511,7 +513,7 @@ carto.Parser = function Parser(env) {
                         return new tree.Invalid(value, memo, 'Missing closing ) in URL.');
                     } else {
                         return new tree.URL((value.value || value instanceof tree.Variable) ?
-                            value : new tree.Quoted('"', value), imports.paths);
+                            value : new tree.Quoted(true, value), imports.paths);
                     }
                 },
 

lib/carto/tree/field.js

@@ -13,7 +13,8 @@ tree.Field.prototype = {
         return this;
     },
     operate: function(op, other) {
-        return new tree.Quoted('', this.toString() + op +  other.toString(true));
+        return new tree.Quoted(false,
+            this.toString() + op + other.toString(true));
     }
 };
 

lib/carto/tree/operation.js

@@ -30,7 +30,9 @@ tree.Operation.prototype.eval = function(env) {
         }
     }
 
-    if (a instanceof tree.Quoted || b instanceof tree.Quoted) {
+    // Only concatenate plain strings, because this is easily
+    // pre-processed
+    if (a instanceof tree.Quoted && b instanceof tree.Quoted) {
         if (this.op !== '+') {
             env.error({
                message: "Can't subtract, divide, or multiply strings.",

lib/carto/tree/quoted.js

@@ -1,14 +1,18 @@
 (function(tree) {
 
-tree.Quoted = function Quoted(str, content) {
+tree.Quoted = function Quoted(ever_quote, content) {
     this.value = content || '';
-    this.quote = str.charAt(0);
+    // ever_quote is basicaly a shutoff switch for this quoted string
+    // being a real expression. you can pass `false` as the first parameter
+    // to make sure that this never gets double-quoted. This is used with fields.
+    this.ever_quote = ever_quote;
     this.is = 'string';
 };
+
 tree.Quoted.prototype = {
     toString: function(quotes) {
         var xmlvalue = this.value.replace(/\'/g, ''');
-        return (quotes === true) ? "'" + xmlvalue + "'" : this.value;
+        return (this.ever_quote && quotes === true) ? "'" + xmlvalue + "'" : this.value;
     },
 
     'eval': function() {
@@ -17,10 +21,10 @@ tree.Quoted.prototype = {
 
     operate: function(op, other) {
         if (other.is !== 'string') {
-            return new tree.Quoted(this.quote,
+            return new tree.Quoted(false,
                 this.toString(true) + op + other.toString());
         } else {
-            return new tree.Quoted(this.quote,
+            return new tree.Quoted(true,
                 tree.operate(op, this.toString(), other.toString()));
         }
     }

test/rendering/field.mss

@@ -1,5 +1,5 @@
 #world {
-  text-name: "hello " + [NAME];
+  text-name: "hello " + [NAME] + ' hello';
   text-size: 11;
   text-face-name: "Georgia Regular", "Arial Italic";
 }