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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_HELPER_FNS_H
+#define SEEN_HELPER_FNS_H
+/*
+ * Authors:
+ * Felipe CorrĂȘa 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 :