From: Alvin Penner <penner@vaxxine.com>
Date: Mon, 19 Jul 2010 22:54:52 +0000 (-0400)
Subject: patch by Daniel Blueman for Bug 590079
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=d86a4fc3e359417ff087c4d602dd4f0970523abd;p=inkscape.git

patch by Daniel Blueman for Bug 590079
---

diff --git a/share/extensions/funcplot.py b/share/extensions/funcplot.py
index e5f93d430..126429853 100644
--- a/share/extensions/funcplot.py
+++ b/share/extensions/funcplot.py
@@ -70,10 +70,14 @@ def drawfunction(xstart, xend, ybottom, ytop, samples, width, height, left, bott
         ytop = (bottom+height-yzero)/scaley
 
     # functions specified by the user
-    if fx != "":
-        f = eval('lambda x: ' + fx.strip('"'))
-    if fpx != "":
-        fp = eval('lambda x: ' + fpx.strip('"'))
+    try:
+        if fx != "":
+            f = eval('lambda x: ' + fx.strip('"'))
+        if fpx != "":
+            fp = eval('lambda x: ' + fpx.strip('"'))
+    # handle incomplete/invalid function gracefully
+    except SyntaxError:
+        return []
 
     # step is the distance between nodes on x
     step = (xend - xstart) / (samples-1)