[glib/wip/pcre-8.31: 4/4] regex: Add accessor to get max length of lookbehind characters

[Christian Persch <chpe src gnome org>]

commit 2fac72a29e7165504a88c7c100d94843965c4686
Author: Christian Persch <chpe gnome org>
Date:   Thu Jun 14 22:33:15 2012 +0200

    regex: Add accessor to get max length of lookbehind characters
    
    Use PCRE_INFO_MAXLOOKBEHIND to get the length (in characters) of the
    longest lookbehind assertion in the pattern.

 docs/reference/glib/glib-sections.txt |    1 +
 glib/gregex.c                         |   28 ++++++++++++++++++++++++++++
 glib/gregex.h                         |    1 +
 3 files changed, 30 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/glib/glib-sections.txt b/docs/reference/glib/glib-sections.txt
index 02652a7..298e9fc 100644
--- a/docs/reference/glib/glib-sections.txt
+++ b/docs/reference/glib/glib-sections.txt
@@ -1004,6 +1004,7 @@ g_regex_ref
 g_regex_unref
 g_regex_get_pattern
 g_regex_get_max_backref
+g_regex_get_max_lookbehind
 g_regex_get_capture_count
 g_regex_get_has_cr_or_lf
 g_regex_get_string_number
diff --git a/glib/gregex.c b/glib/gregex.c
index afd3f92..a064868 100644
--- a/glib/gregex.c
+++ b/glib/gregex.c
@@ -1525,6 +1525,34 @@ g_regex_get_max_backref (const GRegex *regex)
   return value;
 }
 
+
+/**
+ * g_regex_get_max_backref:
+ * @regex: a #GRegex
+ *
+ * Returns the lentgh of the longest lookbehind assertion in the pattern, in
+ * characters. Returns <literal>0</literal> if the pattern does not
+ * contain lookbehind assertions.
+ *
+ * This information may be useful when doing incremental partial matching; in
+ * that case you should always keep at least this many characters before the
+ * partially matched string.
+ *
+ * Returns: the length of the longest lookbehind assertion in the pattern
+ *
+ * Since: 2.34
+ */
+gint
+g_regex_get_max_lookbehind (const GRegex *regex)
+{
+  gint value;
+
+  pcre_fullinfo (regex->pcre_re, regex->extra,
+                 PCRE_INFO_MAXLOOKBEHIND, &value);
+
+  return value;
+}
+
 /**
  * g_regex_get_capture_count:
  * @regex: a #GRegex
diff --git a/glib/gregex.h b/glib/gregex.h
index 7820a14..33e5451 100644
--- a/glib/gregex.h
+++ b/glib/gregex.h
@@ -449,6 +449,7 @@ GRegex           *g_regex_ref			(GRegex              *regex);
 void		  g_regex_unref			(GRegex              *regex);
 const gchar	 *g_regex_get_pattern		(const GRegex        *regex);
 gint		  g_regex_get_max_backref	(const GRegex        *regex);
+gint              g_regex_get_max_lookbehind    (const GRegex        *regex);
 gint		  g_regex_get_capture_count	(const GRegex        *regex);
 gboolean          g_regex_get_has_cr_or_lf      (const GRegex        *regex);
 gint		  g_regex_get_string_number	(const GRegex        *regex,