lib/wlang/template.rb in wlang-0.8.4 vs lib/wlang/template.rb in wlang-0.8.5

@@ -50,14 +50,14 @@
     end
   
     # Returns template's source text
     def source_text
       case @source
-      when String
-        @source
-      else
-        @source.to_s
+        when String
+          @source
+        else
+          @source.to_s
       end
     end
   
     #
     # Instantiate the template, with an additional context and an output buffer.
@@ -70,9 +70,31 @@
       instantiated = parser.instantiate
       unless context.nil?
         @context.pop
       end
       instantiated[0]
+    end
+    
+    # Returns a friendly position of an offset in the source text
+    def where(offset)
+      src = source_text
+      "#{@source_file}:#{src.__wlang_line_of(offset)}:#{src.__wlang_column_of(offset)-1}"
+    end
+    
+    # Raises a WLang::Error for the given offset
+    def error(offset, msg = "")
+      src = source_text
+      line, column = src.__wlang_line_of(offset), src.__wlang_column_of(offset)-1
+      raise WLang::Error, "#{@source_file}:#{line}:#{column} #{msg}"
+    end
+    
+    # Raises a friendly ParseError, with positions and so on
+    def parse_error(offset, msg = "")
+      src = source_text
+      line, column = src.__wlang_line_of(offset), src.__wlang_column_of(offset)-1
+      ex = ParseError.new("#{@source_file}:#{line}:#{column} #{msg}")
+      ex.line, ex.column = line, column
+      raise ex
     end
   
   end # class Template
   
 end # module WLang
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