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 :