From e6798c53cf417c97ad8d518d6095bcd6f17e739c Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 5 Oct 2022 18:58:51 +0200
Subject: [PATCH] Base: add helper function to convert a string of a triple of
 floats into Vector3f

---
 src/Base/Builder3D.cpp | 31 +++++++++++++++++++++++++++++++
 src/Base/Builder3D.h   |  7 +++++++
 src/Base/PreCompiled.h |  2 ++
 3 files changed, 40 insertions(+)

diff --git a/src/Base/Builder3D.cpp b/src/Base/Builder3D.cpp
index e813daac55..62435301d6 100644
--- a/src/Base/Builder3D.cpp
+++ b/src/Base/Builder3D.cpp
@@ -26,9 +26,12 @@
 #ifndef _PreComp_
 # include <algorithm>
 # include <cassert>
+# include <exception>
 # include <string>
+# include <string_view>
 # include <fstream>
 # include <boost/algorithm/string.hpp>
+# include <boost/algorithm/string/predicate.hpp>
 # include <boost/lexical_cast.hpp>
 # include <boost/tokenizer.hpp>
 #endif
@@ -1114,3 +1117,31 @@ bool InventorLoader::isValid() const
 
     return true;
 }
+
+namespace Base {
+Vector3f to_vector(std::string str)
+{
+    std::string_view view = str;
+    if (!boost::starts_with(view, "(") || !boost::ends_with(str, ")"))
+        throw std::runtime_error("string is not a tuple");
+
+    view.remove_prefix(1);
+    view.remove_suffix(1);
+
+    boost::char_separator<char> sep(" ,");
+    boost::tokenizer<boost::char_separator<char> > tokens(view, sep);
+    std::vector<std::string> token_results;
+    token_results.assign(tokens.begin(), tokens.end());
+
+    if (token_results.size() != 3)
+        throw std::runtime_error("not a tuple of three floats");
+
+    Base::Vector3f vec;
+    vec.x = boost::lexical_cast<float>(token_results.at(0));
+    vec.y = boost::lexical_cast<float>(token_results.at(1));
+    vec.z = boost::lexical_cast<float>(token_results.at(2));
+
+    return vec;
+}
+
+}
diff --git a/src/Base/Builder3D.h b/src/Base/Builder3D.h
index 6ab1ce698e..f9d5664640 100644
--- a/src/Base/Builder3D.h
+++ b/src/Base/Builder3D.h
@@ -402,6 +402,13 @@ private:
     std::istream &inp;
 };
 
+/*!
+ * Expects a string of the form "(x,y,z)" and creates a vector from it.
+ * If it fails then a std::exception is thrown.
+ * Supported type names are float or double
+ */
+Base::Vector3f to_vector(std::string);
+
 } //namespace Base
 
 #endif // BASE_BUILDER3D_H
diff --git a/src/Base/PreCompiled.h b/src/Base/PreCompiled.h
index 25936cf8ec..2bef608c20 100644
--- a/src/Base/PreCompiled.h
+++ b/src/Base/PreCompiled.h
@@ -64,6 +64,7 @@
 
 // STL
 #include <string>
+#include <string_view>
 #include <list>
 #include <map>
 #include <unordered_map>
@@ -112,6 +113,7 @@
 #include <boost/filesystem/operations.hpp>
 #include <boost/filesystem/exception.hpp>
 #include <boost/algorithm/string.hpp>
+#include <boost/algorithm/string/predicate.hpp>
 #include <boost/lexical_cast.hpp>
 #include <boost/regex.hpp>
 #include <boost/tokenizer.hpp>