From: José Fonseca <jose.r.fonseca@gmail.com>
Date: Tue, 13 Dec 2011 08:29:55 +0000 (+0000)
Subject: Approximate comparison for floats.
X-Git-Url: https://git.cworth.org/git?p=apitrace;a=commitdiff_plain;h=5d4d17e46e451861563a7b33cf446664cfadf6a6

Approximate comparison for floats.
---

diff --git a/scripts/jsondiff.py b/scripts/jsondiff.py
index b541e44..0a4f7ba 100755
--- a/scripts/jsondiff.py
+++ b/scripts/jsondiff.py
@@ -137,8 +137,9 @@ class Dumper(Visitor):
 
 class Comparer(Visitor):
 
-    def __init__(self, ignore_added = False):
+    def __init__(self, ignore_added = False, tolerance = 2.0 ** -24):
         self.ignore_added = ignore_added
+        self.tolerance = tolerance
 
     def visit_object(self, a, b):
         if not isinstance(b, dict):
@@ -172,8 +173,13 @@ class Comparer(Visitor):
         return True
 
     def visit_value(self, a, b):
-        return a == b
-
+        if isinstance(a, float) or isinstance(b, float):
+            if a == 0:
+                return abs(b) < self.tolerance
+            else:
+                return abs((b - a)/a) < self.tolerance
+        else:
+            return a == b
 
 
 class Differ(Visitor):