WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/libslic3r/PlaceholderParser.hpp

@@ -0,0 +1,50 @@
+#ifndef slic3r_PlaceholderParser_hpp_
+#define slic3r_PlaceholderParser_hpp_
+
+#include "libslic3r.h"
+#include <map>
+#include <string>
+#include <vector>
+#include "PrintConfig.hpp"
+
+namespace Slic3r {
+
+class PlaceholderParser
+{
+public:    
+    PlaceholderParser();
+    
+    void apply_config(const DynamicPrintConfig &config);
+    void apply_env_variables();
+
+    // Add new ConfigOption values to m_config.
+    void set(const std::string &key, const std::string &value)  { this->set(key, new ConfigOptionString(value)); }
+    void set(const std::string &key, int value)                 { this->set(key, new ConfigOptionInt(value)); }
+    void set(const std::string &key, unsigned int value)        { this->set(key, int(value)); }
+    void set(const std::string &key, bool value)                { this->set(key, new ConfigOptionBool(value)); }
+    void set(const std::string &key, double value)              { this->set(key, new ConfigOptionFloat(value)); }
+    void set(const std::string &key, const std::vector<std::string> &values) { this->set(key, new ConfigOptionStrings(values)); }
+    void set(const std::string &key, ConfigOption *opt)         { m_config.set_key_value(key, opt); }
+    const DynamicConfig&    config() const                      { return m_config; }
+    const ConfigOption*     option(const std::string &key) const { return m_config.option(key); }
+
+    // Fill in the template using a macro processing language.
+    // Throws std::runtime_error on syntax or runtime error.
+    std::string process(const std::string &templ, unsigned int current_extruder_id, const DynamicConfig *config_override = nullptr) const;
+    
+    // Evaluate a boolean expression using the full expressive power of the PlaceholderParser boolean expression syntax.
+    // Throws std::runtime_error on syntax or runtime error.
+    static bool evaluate_boolean_expression(const std::string &templ, const DynamicConfig &config, const DynamicConfig *config_override = nullptr);
+
+    // Update timestamp, year, month, day, hour, minute, second variables at the provided config.
+    static void update_timestamp(DynamicConfig &config);
+    // Update timestamp, year, month, day, hour, minute, second variables at m_config.
+    void update_timestamp() { update_timestamp(m_config); }
+
+private:
+    DynamicConfig m_config;
+};
+
+}
+
+#endif