First work on Backends en the BackendManager

include/Parsodus/backend.h

@@ -2,9 +2,80 @@
 #ifndef PARSODUS_BACKEND_H
 #define PARSODUS_BACKEND_H
 
+#include "Parsodus/config.h"
+#include "Parsodus/template.h"
+#include "Parsodus/util/parserType.h"
+
+#include <functional>
+#include <memory>
+#include <string>
+
 namespace pds {
-    class Backend;
-    class LRBackend;
+    class Backend {
+		public:
+            /**
+             * Constructor
+             */
+            Backend();
+
+            /**
+             * Destructor
+             */
+            virtual ~Backend();
+
+            /**
+             * Report a name for the backend
+             * used in resolving template paths
+             *
+             * @return std::string A name for the backend
+             */
+            virtual std::string getName() = 0;
+
+            /**
+             * Can this backend process the language with given description?
+             *
+             * @param lang A description for a language (eg. "c++", "cxx", "cpp")
+             * @return Can this backend process it
+             */
+            virtual bool canProcessLang(std::string lang);
+
+            /**
+             * Can this backend generate a parser for the given description?
+             *
+             * @param parserType A type of parser that could be generated by this backend
+             * @return Can this backend generate this type of parser
+             */
+            
+            virtual bool canGenerateParser(util::ParserType parserType);
+            
+            /**
+             * The function that gets called to generate the actual parser
+             *
+             * @param getOstreamForFileName A function that takes a filename and returns a std::ostream that the backend can write to for that filename
+             * @param parserName The name that should be given to the parser
+             * @param config The Config-object containing the grammar
+             */
+            virtual void generateParser(std::function<std::unique_ptr<std::ostream>(std::string)> getOstreamForFileName, std::string parserName, const Config& config) = 0;
+
+        protected:
+            /**
+             * Render a template (with given (file)name) to the given ostream with the information provided
+             *
+             * @param out The ostream to write the rendered template to
+             * @param templateName An identifier for the template, is combined with `getName()` to construct the actual path
+             * @param context The information that should be provided to the template when rendering
+             */
+            void doTemplate(std::ostream& out, std::string templateName, templ::TemplateContext context);
+
+        private:
+            /**
+             * Find the template with given name
+             *
+             * @param templateName the template name, gets combined with `getName()`
+             */
+            std::string findTemplate(std::string templateName);
+ 
+    };
 }
 
 #endif //PARSODUS_BACKEND_H

include/Parsodus/backendmanager.h

@@ -7,6 +7,10 @@
 #include <vector>
 
 #include "Parsodus/backend.h"
+#include "Parsodus/lrtables/generator.h"
+#include "Parsodus/lrtables/LR0Itemset.h"
+#include "Parsodus/lrtables/SLR1Itemset.h"
+#include "Parsodus/util/parserType.h"
 
 namespace pds {
     /**
@@ -22,19 +26,21 @@ namespace pds {
              */
             void registerBackend(std::unique_ptr<Backend> backend);
 
-            /**
-             * Register an *LR type backend
-             */
-            void registerLRBackend(std::unique_ptr<LRBackend> b);
-
+            template<template<class > class T>
+            void registerLR() {
+                registerBackend(std::make_unique<T<lr::Generator<lr::LR0Itemset>>>(util::ParserType::LR_0)); 
+                registerBackend(std::make_unique<T<lr::Generator<lr::SLR1Itemset>>>(util::ParserType::SLR_1)); 
+            }
+            
             /**
              * Get a backend that can process the given language
              * The manager retains ownership of the returned pointer
              *
              * @param lang The language the backend should be able to process
+             * @param parserType the type of parser it should be able to produce (e.g. LALR_1, LR_0, etc..)
              * @returns A pointer to a Backend if it can find one, nullptr otherwise
              */
-            Backend* findBackend(std::string lang, std::string parserType);
+            Backend* findBackend(std::string lang, util::ParserType parserType);
 
         private:
             std::vector<std::unique_ptr<Backend> > m_backends; ///< The list of registered backends

include/Parsodus/backends/cppLR.h

@@ -0,0 +1,42 @@
+#pragma once
+#ifndef PARSODUS_BACKENDS_CPP_H
+#define PARSODUS_BACKENDS_CPP_H
+
+#include "Parsodus/backend.h"
+
+namespace pds {
+namespace backends {
+	
+	/**
+	 * A backend that emits c++ code
+	 */
+	template<typename T>
+	class CppLRBackend : public Backend {
+		public:
+			CppLRBackend(util::ParserType parserType): Backend(), m_parserType(parserType) {}
+
+			~CppLRBackend() {}
+
+			std::string getName() {
+                return "c++";
+            }
+			bool canProcessLang(std::string lang) {
+                for (char& c : lang)
+                    c = std::tolower(c);
+                return lang == "c++" || lang == "cpp" || lang == "cxx";
+            }
+
+            bool canGenerateParser(util::ParserType parserType) {
+                return parserType == m_parserType;
+            }
+            
+			void generateParser(std::function<std::unique_ptr<std::ostream>(std::string)> getOstreamForFileName, std::string parserName, const Config& config) {
+                //TODO
+            }
+        private:
+            util::ParserType m_parserType;
+    };
+}
+}
+
+#endif //PARSODUS_BACKENDS_CPP_H

src/backend.cpp

@@ -0,0 +1,28 @@
+#include "Parsodus/backend.h"
+#include "config.h"
+
+namespace pds {
+    Backend::Backend()
+    {}
+
+    Backend::~Backend()
+    {}
+
+    bool Backend::canProcessLang(std::string /*lang*/) {
+        return false;
+    }
+
+    bool Backend::canGenerateParser(util::ParserType /*parserType*/) {
+        return false;
+    }
+
+    void Backend::doTemplate(std::ostream& out, std::string templateName, templ::TemplateContext context) {
+        templ::Template tpl(findTemplate(templateName));
+        tpl.render(out, context);
+    }
+
+    std::string Backend::findTemplate(std::string templateName) {
+        return DATADIR "templates/" + templateName;
+    }
+
+}

src/backendmanager.cpp

@@ -0,0 +1,15 @@
+#include "Parsodus/backendmanager.h"
+#include "Parsodus/backend.h"
+
+namespace pds {
+    void BackendManager::registerBackend(std::unique_ptr<Backend> backend) {
+        m_backends.push_back(std::move(backend));
+    }
+    
+    Backend* BackendManager::findBackend(std::string lang, util::ParserType parserType) {
+        for(std::unique_ptr<Backend> &backend: m_backends) {
+            if(backend->canProcessLang(lang) && backend->canGenerateParser(parserType)) return backend.get();
+        }
+        return nullptr;
+    }
+}