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-rw-r--r--src/extract-uri.cpp111
1 files changed, 111 insertions, 0 deletions
diff --git a/src/extract-uri.cpp b/src/extract-uri.cpp
new file mode 100644
index 0000000..65401df
--- /dev/null
+++ b/src/extract-uri.cpp
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#include <cstring>
+#include <glib.h>
+
+#include "extract-uri.h"
+
+// FIXME: kill this ugliness when we have a proper CSS parser
+
+// Functions as per 4.3.4 of CSS 2.1
+// http://www.w3.org/TR/CSS21/syndata.html#uri
+std::string extract_uri(char const *s, char const **endptr)
+{
+ std::string result;
+
+ if (!s)
+ return result;
+
+ gchar const *sb = s;
+ if ( strlen(sb) < 4 || strncmp(sb, "url", 3) != 0 ) {
+ return result;
+ }
+
+ sb += 3;
+
+ if ( endptr ) {
+ *endptr = nullptr;
+ }
+
+ // This first whitespace technically is not allowed.
+ // Just left in for now for legacy behavior.
+ while ( ( *sb == ' ' ) ||
+ ( *sb == '\t' ) )
+ {
+ sb++;
+ }
+
+ if ( *sb == '(' ) {
+ sb++;
+ while ( ( *sb == ' ' ) ||
+ ( *sb == '\t' ) )
+ {
+ sb++;
+ }
+
+ gchar delim = ')';
+ if ( (*sb == '\'' || *sb == '"') ) {
+ delim = *sb;
+ sb++;
+ }
+
+ if (!*sb) {
+ return result;
+ }
+
+ gchar const* se = sb;
+ while ( *se && (*se != delim) ) {
+ se++;
+ }
+
+ // we found the delimiter
+ if ( *se ) {
+ if ( delim == ')' ) {
+ if ( endptr ) {
+ *endptr = se + 1;
+ }
+
+ // back up for any trailing whitespace
+ while (se > sb && g_ascii_isspace(se[-1]))
+ {
+ se--;
+ }
+
+ result = std::string(sb, se);
+ } else {
+ gchar const* tail = se + 1;
+ while ( ( *tail == ' ' ) ||
+ ( *tail == '\t' ) )
+ {
+ tail++;
+ }
+ if ( *tail == ')' ) {
+ if ( endptr ) {
+ *endptr = tail + 1;
+ }
+ result = std::string(sb, se);
+ }
+ }
+ }
+ }
+
+ return result;
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :