Author: Antonio Cuni <[email protected]>
Branch: fastjson
Changeset: r64827:374e8a9d721a
Date: 2013-06-06 14:19 +0200
http://bitbucket.org/pypy/pypy/changeset/374e8a9d721a/
Log: try to speedup things
diff --git a/pypy/module/_fastjson/interp_decoder.py
b/pypy/module/_fastjson/interp_decoder.py
--- a/pypy/module/_fastjson/interp_decoder.py
+++ b/pypy/module/_fastjson/interp_decoder.py
@@ -49,16 +49,19 @@
self.i = i2
def getslice(self, start, end):
+ assert start > 0
assert end > 0
return self.s[start:end]
def skip_whitespace(self):
- while not self.eof():
- ch = self.peek()
+ i = self.i
+ while i < len(self.s):
+ ch = self.s[i]
if is_whitespace(ch):
- self.next()
+ i+=1
else:
break
+ self.i = i
@specialize.arg(1)
def _raise(self, msg, *args):
@@ -240,14 +243,16 @@
def decode_string(self):
start = self.i
+ i = self.i
bits = 0
- while not self.eof():
+ while i < len(self.s):
# this loop is a fast path for strings which do not contain escape
# characters
- ch = self.next()
+ ch = self.s[i]
+ i += 1
bits |= ord(ch)
if ch == '"':
- content_utf8 = self.getslice(start, self.i-1)
+ content_utf8 = self.getslice(start, i-1)
if bits & 0x80:
# the 8th bit is set, it's an utf8 strnig
content_unicode = unicodehelper.decode_utf8(self.space,
content_utf8)
@@ -255,10 +260,11 @@
# ascii only, faster to decode
content_unicode = content_utf8.decode('ascii')
self.last_type = TYPE_STRING
+ self.i = i
return self.space.wrap(content_unicode)
elif ch == '\\':
- content_so_far = self.getslice(start, self.i-1)
- self.unget()
+ content_so_far = self.getslice(start, i-1)
+ self.i = i-1
return self.decode_string_escaped(start, content_so_far)
self._raise("Unterminated string starting at char %d", start)
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