From 06c639db6b98affab4abf07e57a90e2fcb5402ef Mon Sep 17 00:00:00 2001
From: rcoh <rcoh@mit.edu>
Date: Sat, 5 Feb 2011 22:34:34 -0500
Subject: Early stages of param-binding in xml.  Functional.  RCOH

---
 util/ColorOps.py |  4 ++++
 util/Config.py   | 10 ++++++++++
 util/Geo.py      |  7 +++++++
 3 files changed, 21 insertions(+)

(limited to 'util')

diff --git a/util/ColorOps.py b/util/ColorOps.py
index 4b1162a..796a902 100644
--- a/util/ColorOps.py
+++ b/util/ColorOps.py
@@ -40,3 +40,7 @@ def randomBrightColor():
     hue, sat, val = colorsys.hsv_to_rgb(hue, sat, val)
     ret = [hue, sat, val]
     return floatToIntColor(ret)
+
+class Color(object):
+    def __init__(self, r,g,b):
+        self.rep = [r,g,b]
diff --git a/util/Config.py b/util/Config.py
index 6fdb0d4..4153313 100644
--- a/util/Config.py
+++ b/util/Config.py
@@ -1,4 +1,5 @@
 from xml.etree.ElementTree import *
+import re
 import sys
 import xml
 import pdb
@@ -113,6 +114,15 @@ def pullArgsFromItem(parentNode):
 
 def attemptEval(val):
     try:
+        if '${' in val and '}$' in val: #TODO: this could be a little cleaner
+            dictVal = re.sub("'\$\{(.+)\}\$'", "b['\\1']", val) #replace all expressions like {blah} with a['blah']
+            dictVal = re.sub("\$\{(.+)\}\$", "a['\\1']", dictVal) #replace all expressions like {blah} with a['blah']
+            if "'${" and "}$'" in val: #nested lambda madness
+                lambdaVal = eval('lambda a: lambda b: ' + dictVal)
+            else:
+                lambdaVal = eval('lambda a:'+dictVal) #TODO: nested lambdas
+            return lambdaVal  #convert referential objects to lambda expressions which resolve
+            #dynamically
         val = eval(val)
     except (NameError, SyntaxError):
         val = str(val)
diff --git a/util/Geo.py b/util/Geo.py
index 0dde80b..43817ad 100644
--- a/util/Geo.py
+++ b/util/Geo.py
@@ -32,3 +32,10 @@ def windtrail(x,y,height,center,width):
     b=center
     c=width
     return a*((math.exp(-((x-b))/(c)))**2)*(math.exp(-((y))/(0.2*c)))**2
+
+class Location(object):
+    def __init__(self,x=0,y=0):
+        self.x = x
+        self.y = y
+    def __add__(self, b):
+        return Location(self.x+b.x, self.y+b.y)
-- 
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