10:22 a.m.
This way it is possible to change where the matching start, instead of
always assuming it is the beginning.
---
common/mlpcre/PCRE.ml | 2 +-
common/mlpcre/PCRE.mli | 5 ++++-
common/mlpcre/pcre-c.c | 16 +++++++++++++---
common/mlpcre/pcre_tests.ml | 15 ++++++++++++---
4 files changed, 30 insertions(+), 8 deletions(-)
diff --git a/common/mlpcre/PCRE.ml b/common/mlpcre/PCRE.ml
index b054928f9..33074af1c 100644
--- a/common/mlpcre/PCRE.ml
+++ b/common/mlpcre/PCRE.ml
@@ -23,7 +23,7 @@ exception Error of string * int
type regexp
external compile : ?anchored:bool -> ?caseless:bool -> ?dotall:bool ->
?extended:bool -> ?multiline:bool -> string -> regexp =
"guestfs_int_pcre_compile_byte" "guestfs_int_pcre_compile"
-external matches : regexp -> string -> bool = "guestfs_int_pcre_matches"
+external matches : ?offset:int -> regexp -> string -> bool =
"guestfs_int_pcre_matches"
external sub : int -> string = "guestfs_int_pcre_sub"
external subi : int -> int * int = "guestfs_int_pcre_subi"
diff --git a/common/mlpcre/PCRE.mli b/common/mlpcre/PCRE.mli
index eacb6fd90..e10d512fc 100644
--- a/common/mlpcre/PCRE.mli
+++ b/common/mlpcre/PCRE.mli
@@ -62,7 +62,7 @@ val compile : ?anchored:bool -> ?caseless:bool -> ?dotall:bool
-> ?extended:bool
See pcreapi(3) for details of what they do.
All flags default to false. *)
-val matches : regexp -> string -> bool
+val matches : ?offset:int -> regexp -> string -> bool
(** Test whether the regular expression matches the string. This
returns true if the regexp matches or false otherwise.
@@ -71,6 +71,9 @@ val matches : regexp -> string -> bool
or the thread/program exits. You can call {!sub} to return
these substrings.
+ The [?offset] flag is used to change the start of the search,
+ which by default is at the beginning of the string (position 0).
+
This can raise {!Error} if PCRE returns an error. *)
val sub : int -> string
diff --git a/common/mlpcre/pcre-c.c b/common/mlpcre/pcre-c.c
index 0762a8341..be054a004 100644
--- a/common/mlpcre/pcre-c.c
+++ b/common/mlpcre/pcre-c.c
@@ -121,6 +121,15 @@ is_Some_true (value v)
Bool_val (Field (v, 0)) /* Some true */;
}
+static int
+Optint_val (value intv, int defval)
+{
+ if (intv == Val_int (0)) /* None */
+ return defval;
+ else /* Some int */
+ return Int_val (Field (intv, 0));
+}
+
value
guestfs_int_pcre_compile (value anchoredv, value caselessv, value dotallv,
value extendedv, value multilinev,
@@ -165,9 +174,9 @@ guestfs_int_pcre_compile_byte (value *argv, int argn)
}
value
-guestfs_int_pcre_matches (value rev, value strv)
+guestfs_int_pcre_matches (value offsetv, value rev, value strv)
{
- CAMLparam2 (rev, strv);
+ CAMLparam3 (offsetv, rev, strv);
pcre *re = Regexp_val (rev);
struct last_match *m, *oldm;
size_t len = caml_string_length (strv);
@@ -205,7 +214,8 @@ guestfs_int_pcre_matches (value rev, value strv)
caml_raise_out_of_memory ();
}
- m->r = pcre_exec (re, NULL, m->subject, len, 0, 0, m->vec, veclen);
+ m->r = pcre_exec (re, NULL, m->subject, len, Optint_val (offsetv, 0), 0,
+ m->vec, veclen);
if (m->r < 0 && m->r != PCRE_ERROR_NOMATCH) {
int ret = m->r;
free_last_match (m);
diff --git a/common/mlpcre/pcre_tests.ml b/common/mlpcre/pcre_tests.ml
index 346019c40..f199ad63a 100644
--- a/common/mlpcre/pcre_tests.ml
+++ b/common/mlpcre/pcre_tests.ml
@@ -18,6 +18,10 @@
open Printf
+let optget def = function
+ | None -> def
+ | Some v -> v
+
let compile ?(anchored = false) ?(caseless = false)
?(dotall = false) ?(extended = false) ?(multiline = false)
patt =
@@ -30,9 +34,9 @@ let compile ?(anchored = false) ?(caseless = false)
patt;
PCRE.compile ~anchored ~caseless ~dotall ~extended ~multiline patt
-let matches re str =
- eprintf "PCRE.matches %s ->%!" str;
- let r = PCRE.matches re str in
+let matches ?offset re str =
+ eprintf "PCRE.matches %s, %d ->%!" str (optget 0 offset);
+ let r = PCRE.matches ?offset re str in
eprintf " %b\n%!" r;
r
@@ -103,6 +107,11 @@ let () =
assert (subi 1 = (2, 3));
assert (subi 2 = (3, 3));
+ assert (matches ~offset:5 re0 "aaabcabc" = true);
+ assert (sub 0 = "ab");
+
+ assert (matches ~offset:5 re0 "aaabcbaac" = false);
+
assert (replace re0 "dd" "abcabcaabccca" =
"ddcabcaabccca");
assert (replace ~global:true re0 "dd" "abcabcaabccca" =
"ddcddcddccca");
--
2.20.1