# HG changeset patch
# User Thinker K.F. Li <thinker@codemud.net>
# Date 1308147360 -28800
# Node ID 0766bd54c9d3ec37f3f52e84e98f25998a316ca7
# Parent  ee8aeb299f106fd4b1f1afbcc4bade9869338a0c
Formally parse path into parts in structpath.py

diff -r ee8aeb299f10 -r 0766bd54c9d3 paraspace/structpath.py
--- a/paraspace/structpath.py	Wed Jun 15 13:30:11 2011 +0800
+++ b/paraspace/structpath.py	Wed Jun 15 22:16:00 2011 +0800
@@ -24,6 +24,10 @@
 # objs = find_objs_path(ctx, '/car/wheels')
 # \endcode
 #
+import re
+
+_reo_nest_chars = re.compile('[\'"\\[\\]/\\\\]')
+
 class context(object):
     all_classes = None
     class_instances = None
@@ -44,9 +48,83 @@
     pass
 
 
+STATE_START = 0
+STATE_PRED = 1
+STATE_STR_SQ = 2
+STATE_STR_DQ = 3
+STATE_BKSP = 4
+
 def _path_split(path):
-    parts = [p.strip()
-             for p in path.split('/')]
+    stk = []
+    idx = 0
+    left = 0
+    state = STATE_START
+    parts = []
+    while True:
+        mo = _reo_nest_chars.search(path, idx)
+        
+        if mo == None:
+            parts.append(path[left:])
+            break
+        
+        ch = mo.group()
+        idx = mo.end()
+        if state == STATE_START:
+            if ch == '/':
+                parts.append(path[left:idx - 1])
+                left = idx
+            elif ch == '[':
+                stk.append(state)
+                state = STATE_PRED
+            elif ch == '\'':
+                stk.append(state)
+                state = STATE_STR_SQ
+            elif ch == '"':
+                stk.append(state)
+                state = STATE_STR_DQ
+                pass
+            pass
+        elif state == STATE_STR_SQ:
+            if ch == '\'':
+                state = stk.pop()
+                pass
+            elif ch == '\\':
+                stk.append(state)
+                state = STATE_BKSP
+                bksp_idx = idx
+                pass
+            pass
+        elif state == STATE_STR_DQ:
+            if ch == '"':
+                state = stk.pop()
+            elif ch == '\\':
+                stk.append(state)
+                state = STATE_BKSP
+                bksp_idx = idx
+                pass
+            pass
+        elif state == STATE_PRED:
+            if ch == '[':
+                stk.append(state)
+                state = STATE_PRED
+            elif ch == '\'':
+                stk.append(state)
+                state = STATE_STR_SQ
+            elif ch == '"':
+                stk.append(state)
+                state = STATE_STR_DQ
+            elif ch == ']':
+                state = stk.pop()
+                pass
+            pass
+        elif state == STATE_BKSP:
+            if idx != (bksp_idx + 1):
+                idx = mo.start()
+                pass
+            state = stk.pop()
+            pass
+        pass
+    
     return parts