From 272e9f657ab8776c4254b8065cbe49458b9f51cd Mon Sep 17 00:00:00 2001
From: Thomas Ave <email@thomasave.be>
Date: Tue, 24 May 2016 00:46:23 +0200
Subject: [PATCH] First version of input parser

---
 include/Lexesis/inputparser.h | 22 ++++++++++++++
 src/CMakeLists.txt            |  3 +-
 src/inputparser.cpp           | 57 +++++++++++++++++++++++++++++++++++
 3 files changed, 81 insertions(+), 1 deletion(-)
 create mode 100644 include/Lexesis/inputparser.h
 create mode 100644 src/inputparser.cpp

diff --git a/include/Lexesis/inputparser.h b/include/Lexesis/inputparser.h
new file mode 100644
index 0000000..4a50670
--- /dev/null
+++ b/include/Lexesis/inputparser.h
@@ -0,0 +1,22 @@
+#pragma once
+#ifndef INPUT_PARSER_H 
+#define INPUT_PARSER_H
+
+#include <istream>
+#include <vector>
+#include <string>
+
+namespace lxs {
+    struct DFA;
+    struct ENFA; 
+
+    class InputParser {
+        public:
+            static DFA parseInput(std::istream& is);
+        private:
+            static std::vector<std::pair<std::string,std::string> > parseLines(std::istream &is);
+            static std::vector<ENFA> linesToEnfa(std::vector<std::pair<std::string,std::string> > &input);
+    };
+}
+
+#endif // INPUT_PARSER_H
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 32206e6..6ba0bb2 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -2,4 +2,5 @@ add_executable(Lexesis
     main.cpp
     automata.cpp
     re.cpp
-    )
+    inputparser.cpp
+)
diff --git a/src/inputparser.cpp b/src/inputparser.cpp
new file mode 100644
index 0000000..a2f8b3e
--- /dev/null
+++ b/src/inputparser.cpp
@@ -0,0 +1,57 @@
+#include "Lexesis/automata.h"
+#include "Lexesis/inputparser.h"
+#include "Lexesis/re.h"
+
+#include <istream>
+#include <string>
+#include <iostream>
+#include <memory>
+
+namespace lxs {
+    DFA InputParser::parseInput(std::istream &is) {
+        auto enfavect = parseLines(is);
+        auto enfas = linesToEnfa(enfavect);
+        auto enfa = merge(enfas);
+        for(auto tokens: enfa.acceptingToken) {
+            std::cout << tokens.first << "\t" << tokens.second << std::endl;
+        }
+        for(auto tokens: enfa.priority) {
+            std::cout << tokens.first << "\t" << tokens.second << std::endl;
+        }
+        auto dfa = mssc(enfa);
+        dfa = minimize(dfa);
+        return dfa;
+    }
+    
+     std::vector<std::pair<std::string,std::string> > InputParser::parseLines(std::istream &is) {
+        std::string line;
+        std::vector<std::pair<std::string,std::string> > result;
+        while(std::getline(is,line)) {
+            int loc = line.find_first_of('=');
+            int start = line.find_first_not_of(" ");
+            std::string tokenname = line.substr(start, loc);
+            int end = tokenname.find_last_not_of(" ");
+            tokenname = tokenname.substr(0,end + 1);
+            std::string regex = line.substr(loc+1);
+            start = regex.find_first_not_of(" ");
+            regex = regex.substr(start);
+            result.push_back(std::make_pair(tokenname,regex));
+        }
+        return result;
+    }
+    std::vector<ENFA> InputParser::linesToEnfa(std::vector<std::pair<std::string,std::string> > &input) {
+        std::vector<ENFA> result;
+        for(unsigned int i=0;i<input.size();i++) {
+            std::shared_ptr<lxs::RE> re = lxs::parseRE(input[i].second);
+            ENFA enfa;
+            re->toENFA(enfa,0);
+            enfa.numStates++;
+            enfa.starting = 0;
+            enfa.priority.insert(std::make_pair((State) *enfa.accepting.begin(),(Priority) i)); 
+            enfa.acceptingToken.insert(std::make_pair((State) *enfa.accepting.begin(),input[i].first));
+            result.push_back(enfa);
+        }
+        
+        return result;
+    }
+}