From fd23821950f0562a8995735105cd31fdc6d55933 Mon Sep 17 00:00:00 2001
From: Patrick J Cherry <patrick@bytemark.co.uk>
Date: Fri, 22 Jul 2011 16:55:01 +0100
Subject:  * Rejigged configuration  * Added --test and --verbose flags for the
 server config  * Started proper test suite  * Config parsing now gives more
 sensible errors + backtrace  * Rejigged people and source lists

---
 lib/object_builder.rb | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

(limited to 'lib/object_builder.rb')

diff --git a/lib/object_builder.rb b/lib/object_builder.rb
index 7cb808c..a455b3e 100644
--- a/lib/object_builder.rb
+++ b/lib/object_builder.rb
@@ -41,12 +41,14 @@
 # TODO: finish this convoluted example, if it kills me
 #
 class ObjectBuilder
-  class BuildException < Exception; end 
+  class BuildException < StandardError; end 
   
-  attr_reader :result
+  attr_reader   :result
+  attr_accessor :block_result
   
   def initialize(context, *args)
     @context = context
+    @result  = nil
     builder_setup(*args)
   end
   
@@ -93,11 +95,38 @@ class ObjectBuilder
     end
   
     def load(file)
+      parse(File.read(file), file)
+    end
+   
+    def parse(string, file="string")
       builder = self.new
-      builder.instance_eval(File.read(file), file)
+      begin
+        builder.instance_eval(string, file)
+      rescue NameError => ex
+        # 
+        # Ugh.  Catch NameError and re-raise as a BuildException
+        #
+        f,l = ex.backtrace.first.split(":").first(2)
+        if f == file
+          build_ex = BuildException.new "Unknown word `#{ex.name}' in #{file} at line #{l}"
+          build_ex.set_backtrace ex.backtrace
+          raise build_ex
+        else
+          raise ex
+        end
+      rescue SyntaxError, ArgumentError => ex
+        if ex.backtrace.find{|l| l =~ /^#{file}:(\d+):/}
+          build_ex = BuildException.new "#{ex.message} in #{file} at line #{$1}"
+          build_ex.set_backtrace ex.backtrace
+          raise build_ex
+        else
+          raise ex
+        end
+      end
+
       builder.result
     end
-    
+ 
     def inherited(*args)
       initialize_class
     end
@@ -106,7 +135,7 @@ class ObjectBuilder
       @words = {}
     end
   end
-  
+ 
   initialize_class
 end
 
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