Add location data to tokens generated by the rewriter.

lib/coffee-script/rewriter.js

@@ -18,6 +18,7 @@
       this.tagPostfixConditionals();
       this.addImplicitBraces();
       this.addImplicitParentheses();
+      this.addLocationDataToGeneratedTokens();
       return this.tokens;
     };
 
@@ -221,6 +222,31 @@
       });
     };
 
+    Rewriter.prototype.addLocationDataToGeneratedTokens = function() {
+      return this.scanTokens(function(token, i, tokens) {
+        var prevToken;
+        if (token.generated && !token.locationData) {
+          if (i > 0) {
+            prevToken = tokens[i - 1];
+            token.locationData = {
+              first_line: prevToken.locationData.last_line,
+              first_column: prevToken.locationData.last_column,
+              last_line: prevToken.locationData.last_line,
+              last_column: prevToken.locationData.last_column
+            };
+          } else {
+            token.locationData = {
+              first_line: 0,
+              first_column: 0,
+              last_line: 0,
+              last_column: 0
+            };
+          }
+        }
+        return 1;
+      });
+    };
+
     Rewriter.prototype.addImplicitIndentation = function() {
       var action, condition, indent, outdent, starter;
       starter = indent = outdent = null;

src/rewriter.coffee

@@ -26,6 +26,7 @@ class exports.Rewriter
     @tagPostfixConditionals()
     @addImplicitBraces()
     @addImplicitParentheses()
+    @addLocationDataToGeneratedTokens()
     @tokens
 
   # Rewrite the token stream, looking one token ahead and behind.
@@ -190,6 +191,25 @@ class exports.Rewriter
       prev[0] = 'FUNC_EXIST' if prev[0] is '?'
       2
 
+  # Add location data to all tokens generated by the rewriter.
+  addLocationDataToGeneratedTokens: ->
+    @scanTokens (token, i, tokens) ->
+      if token.generated and not token.locationData
+        if i > 0
+          prevToken = tokens[i-1]
+          token.locationData =
+            first_line: prevToken.locationData.last_line
+            first_column: prevToken.locationData.last_column
+            last_line: prevToken.locationData.last_line
+            last_column: prevToken.locationData.last_column
+        else
+          token.locationData =
+            first_line: 0
+            first_column: 0
+            last_line: 0
+            last_column: 0
+      return 1
+
   # Because our grammar is LALR(1), it can't handle some single-line
   # expressions that lack ending delimiters. The **Rewriter** adds the implicit
   # blocks, so it doesn't need to. ')' can close a single-line block,