1 files changed, 104 insertions, 0 deletions
diff --git a/src/helper-fns.h b/src/helper-fns.h
new file mode 100644
index 0000000..27dfc73
--- /dev/null
+++ b/src/helper-fns.h
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_HELPER_FNS_H
+#define SEEN_HELPER_FNS_H
+/*
+ * Authors:
+ *   Felipe Corrêa da Silva Sanches <juca@members.fsf.org>
+ *
+ *
+ * Copyright (C) 2006 Hugo Rodrigues
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <vector>
+#include <sstream>
+
+// calling helperfns_read_number(string, false), it's not obvious, what
+// that false stands for. helperfns_read_number(string, HELPERFNS_NO_WARNING)
+// can be more clear.
+#define HELPERFNS_NO_WARNING false
+
+/* convert ascii representation to double
+ * the function can only be used to convert numbers as given by gui elements that use localized representation
+ * @param value ascii representation of the number
+ * @return the converted number
+ *
+ * Setting warning to false disables conversion error warnings from
+ * this function. This can be useful in places, where the input type
+ * is not known beforehand. For example, see sp_feColorMatrix_set in
+ * sp-fecolormatrix.cpp */
+inline double helperfns_read_number(gchar const *value, bool warning = true) {
+    if (!value) {
+        g_warning("Called helperfns_read_number with value==null_ptr, this can lead to unexpected behaviour.");
+        return 0;
+    }
+    char *end;
+    double ret = g_ascii_strtod(value, &end);
+    if (*end) {
+        if (warning) {
+            g_warning("helper-fns::helperfns_read_number() Unable to convert \"%s\" to number", value);
+        }
+        // We could leave this out, too. If strtod can't convert
+        // anything, it will return zero.
+        ret = 0;
+    }
+    return ret;
+}
+
+inline bool helperfns_read_bool(gchar const *value, bool default_value){
+    if (!value) return default_value;
+    switch(value[0]){
+        case 't':
+            if (strncmp(value, "true", 4) == 0) return true;
+            break;
+        case 'f':
+            if (strncmp(value, "false", 5) == 0) return false;
+            break;
+    }
+    return default_value;
+}
+
+/* convert ascii representation to double
+ * the function can only be used to convert numbers as given by gui elements that use localized representation
+ * numbers are delimited by space
+ * @param value ascii representation of the number
+ * @return the vector of the converted numbers
+ */
+inline std::vector<gdouble> helperfns_read_vector(const gchar* value){
+        std::vector<gdouble> v;
+
+        gchar const* beg = value;
+        while(isspace(*beg) || (*beg == ',')) beg++;
+        while(*beg)
+        {
+            char *end;
+            double ret = g_ascii_strtod(beg, &end);
+            if (end==beg){
+                g_warning("helper-fns::helperfns_read_vector() Unable to convert \"%s\" to number", beg);
+                // We could leave this out, too. If strtod can't convert
+                // anything, it will return zero.
+                // ret = 0;
+                break;
+            }
+            v.push_back(ret);
+
+            beg = end;
+            while(isspace(*beg) || (*beg == ',')) beg++;
+        }
+        return v;
+}
+
+#endif /* !SEEN_HELPER_FNS_H */
+
+/*
+  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 :