From: Robert Bradshaw <robertwb@math.washington.edu>
Date: Wed, 28 May 2008 08:58:32 +0000 (-0700)
Subject: Accept new for-from syntax.
X-Git-Tag: 0.9.8rc1~11^2~10^2~10^2~3^2~4
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=d3e1ddfc54d7ee4c060f3ec3babed51eb9ffef3e;p=cython.git

Accept new for-from syntax.
---

diff --git a/Cython/Compiler/Parsing.py b/Cython/Compiler/Parsing.py
index 4b4c9107..b7b2a88c 100644
--- a/Cython/Compiler/Parsing.py
+++ b/Cython/Compiler/Parsing.py
@@ -1080,9 +1080,13 @@ def p_for_bounds(s):
         s.next()
         iterator = p_for_iterator(s)
         return { 'target': target, 'iterator': iterator }
-    elif s.sy == 'from':
-        s.next()
-        bound1 = p_bit_expr(s)
+    else:
+        if s.sy == 'from':
+            s.next()
+            bound1 = p_bit_expr(s)
+        else:
+            # Support shorter "for a <= x < b" syntax
+            bound1, target = target, None
         rel1 = p_for_from_relation(s)
         name2_pos = s.position()
         name2 = p_ident(s)
@@ -1090,12 +1094,15 @@ def p_for_bounds(s):
         rel2 = p_for_from_relation(s)
         bound2 = p_bit_expr(s)
         step = p_for_from_step(s)
-        if not target.is_name:
-            error(target.pos, 
-                "Target of for-from statement must be a variable name")
-        elif name2 != target.name:
-            error(name2_pos,
-                "Variable name in for-from range does not match target")
+        if target is None:
+            target = ExprNodes.NameNode(name2_pos, name = name2)
+        else:
+            if not target.is_name:
+                error(target.pos, 
+                    "Target of for-from statement must be a variable name")
+            elif name2 != target.name:
+                error(name2_pos,
+                    "Variable name in for-from range does not match target")
         if rel1[0] != rel2[0]:
             error(rel2_pos,
                 "Relation directions in for-from do not match")
@@ -1105,8 +1112,6 @@ def p_for_bounds(s):
                 'relation2': rel2,
                 'bound2': bound2,
                 'step': step }
-    else:
-        s.error("Expected 'in' or 'from'")
 
 def p_for_from_relation(s):
     if s.sy in inequality_relations:
diff --git a/tests/compile/forfromelse.pyx b/tests/compile/forfromelse.pyx
index 014f42b5..11cad88b 100644
--- a/tests/compile/forfromelse.pyx
+++ b/tests/compile/forfromelse.pyx
@@ -5,3 +5,8 @@ cdef void spam():
     else:
         k = j
 
+    # new syntax
+    for 0 <= i < 10:
+        j = i
+    else:
+        j = k