diff mercurial/cext/parsers.c @ 33925:2c37f9dabc32

encoding: add fast path of jsonescape() (issue5533)

This isn't highly optimized as it copies characters one by one, but seems
reasonably simple and not slow.

  (with mercurial repo)
  $ export HGRCPATH=/dev/null HGPLAIN=
  $ hg log --time --config experimental.stabilization=all -Tjson > /dev/null

  (original)
  time: real 6.830 secs (user 6.740+0.000 sys 0.080+0.000)
  time: real 6.690 secs (user 6.650+0.000 sys 0.040+0.000)
  time: real 6.700 secs (user 6.640+0.000 sys 0.060+0.000)

  (this patch)
  time: real 5.630 secs (user 5.550+0.000 sys 0.070+0.000)
  time: real 5.700 secs (user 5.650+0.000 sys 0.050+0.000)
  time: real 5.690 secs (user 5.640+0.000 sys 0.050+0.000)

--- a/mercurial/cext/parsers.c	Sun Apr 23 16:10:51 2017 +0900
+++ b/mercurial/cext/parsers.c	Sun Apr 23 14:47:52 2017 +0900
@@ -702,6 +702,8 @@
 	 "construct a dict with an expected size\n"},
 	{"make_file_foldmap", make_file_foldmap, METH_VARARGS,
 	 "make file foldmap\n"},
+	{"jsonescapeu8fast", jsonescapeu8fast, METH_VARARGS,
+	 "escape a UTF-8 byte string to JSON (fast path)\n"},
 	{"encodedir", encodedir, METH_VARARGS, "encodedir a path\n"},
 	{"pathencode", pathencode, METH_VARARGS, "fncache-encode a path\n"},
 	{"lowerencode", lowerencode, METH_VARARGS, "lower-encode a path\n"},
@@ -714,7 +716,7 @@
 void manifest_module_init(PyObject *mod);
 void revlog_module_init(PyObject *mod);
 
-static const int version = 1;
+static const int version = 2;
 
 static void module_init(PyObject *mod)
 {