commit 3f2ed01095dcbdfa5808765db92e9de07701e539
Author: fsan <fsandalinas@dc.uba.ar>
Date:   Fri Oct 1 11:20:03 2021 -0300

    Initial commit

diff --git a/a.out b/a.out
new file mode 100755
index 0000000..42e273c
Binary files /dev/null and b/a.out differ
diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..df231ee
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+g++ -g main.cpp interpreter.cpp lexer.cpp parser.cpp
diff --git a/info b/info
new file mode 100644
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--- /dev/null
+++ b/info
@@ -0,0 +1,11 @@
+lenguaje orga-straight-line
+
+prgm        -> stms
+stms        -> stm; stm    (s = s1;s2)     -> compound
+stms        -> stms; stm                   -> compound
+stm         -> id = exp    (asignacion)    -> assign
+exp         -> numero      (literal)       -> number
+exp         -> id          (idExp)         -> id
+exp         -> exp op exp  (operacion)     -> opexp
+op          -> +           (suma)          -> plus
+op          -> -           (resta)         -> minus
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diff --git a/interpreter.cpp b/interpreter.cpp
new file mode 100644
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--- /dev/null
+++ b/interpreter.cpp
@@ -0,0 +1,39 @@
+#include "orga-comp.h"
+
+void
+interpreter::evalSTM(struct token stm) {
+	switch (stm.t) {
+		case token::STM_ASSIGN:
+			table[stm.lvalue->value] = evalEXP(*stm.rvalue);
+			std::cout << stm.lvalue->value << " igual a " << table[stm.lvalue->value] << '\n';
+			break;
+		case token::STM_COMPOUND:
+			evalSTM(*stm.lvalue);
+			evalSTM(*stm.rvalue);
+			break;
+		default:
+			std::cout << "ERROR \n";
+			exit(-1);
+			break;
+	}
+}
+
+int
+interpreter::evalEXP(struct token exp) {
+	switch (exp.t) {
+		case token::EXP_NUMBER:
+			return std::stoi(exp.value);
+			break;
+		case token::EXP_ID:
+			return table[exp.value];
+			break;
+		case token::EXP_OPERATION:
+			if(exp.value == "+") return evalEXP(*exp.lvalue) + evalEXP(*exp.rvalue);
+			if(exp.value == "-") return evalEXP(*exp.lvalue) - evalEXP(*exp.rvalue);
+			break;
+		default:
+			std::cout << "ERROR \n";
+			exit(-1);
+			break;
+	}
+}
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diff --git a/lexer.cpp b/lexer.cpp
new file mode 100644
index 0000000..21ea6e6
--- /dev/null
+++ b/lexer.cpp
@@ -0,0 +1,87 @@
+#include "orga-comp.h"
+
+std::vector<struct token>
+lexer::lex_file(std::string filename) {
+	//leer un char -> ver que es -> pasar a un estado
+	// [a-z]	-> id
+	// [0-9]	-> num
+	// +-		-> op
+	// =		-> assign
+	// ;		-> semi
+	std::ifstream file("tst.cfran", std::ifstream::in);
+
+	bool id = false;
+	bool num = false;
+	std::string *value = new std::string();
+	char c;
+
+	while(file.get(c)) {
+		switch (c) {
+			case 'a' ... 'z':
+			case 'A' ... 'Z':
+				if(!num) {
+					id = true;
+					*value += c;
+				} else {
+					std::cout << "Invalid identifier " << value << c << '\n';
+					exit(-1);
+				}
+				//ID o condicional
+				break;
+			case '0' ... '9':
+				if(!id) num = true;
+				*value += c;
+				//NUM o ID
+				break;
+			case '+':
+			case '-':
+				if(id) add_token(token::TOK_ID, *value);
+				if(num) add_token(token::TOK_NUM, *value);
+				value = new std::string();
+				*value += c;
+				add_token(token::TOK_OP, *value);
+				id = false;
+				num = false;
+				value = new std::string();
+				//OP
+				break;
+			case '=':
+				if(id) add_token(token::TOK_ID, *value);
+				if(num) add_token(token::TOK_NUM, *value);
+				add_token(token::TOK_ASSIGN, "");
+				id = false;
+				num = false;
+				value = new std::string();
+				break;
+			case ';':
+				if(id) add_token(token::TOK_ID, *value);
+				if(num) add_token(token::TOK_NUM, *value);
+				add_token(token::TOK_SEMI, "");
+				id = false;
+				num = false;
+				value = new std::string();
+				//STM END
+				break;
+			case ' ':
+				if(id) add_token(token::TOK_ID, *value);
+				if(num) add_token(token::TOK_NUM, *value);
+				id = false;
+				num = false;
+				value = new std::string();
+			default:
+				break;
+		}
+	}
+
+	print_tokens(_tokens);
+
+	return _tokens;
+}
+
+void
+lexer::add_token(token::type type, std::string value) {
+	struct token *token = new struct token;
+	token->t = type;
+	token->value = value;
+	_tokens.push_back(*token);
+}
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..34d90b3
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,81 @@
+#include "orga-comp.h"
+#include <iostream>
+
+int
+main(){
+	// lex -> parse -> analisis semantico
+	// realizar un interprete
+	// interpretar a = 2 + 2
+	struct token test;
+	test.t = test.STM_ASSIGN;
+
+	struct token rexp;
+	rexp.t = token::EXP_OPERATION;
+
+	struct token lnum;
+	lnum.t = test.EXP_NUMBER;
+	lnum.value = "2";
+
+	struct token rnum;
+	rnum.t = test.EXP_NUMBER;
+	rnum.value = "2";
+
+	struct token lexp;
+	lexp.t = token::EXP_ID;
+	lexp.value = "a";
+
+	rexp.lvalue = &lnum;
+	rexp.rvalue = &rnum;
+
+	test.rvalue = &rexp;
+	test.lvalue = &lexp;
+
+	interpreter *inter = new interpreter();
+
+	inter->evalSTM(test);
+
+	lexer lex;
+	parser parser(lex.lex_file("tst.cfran"));
+	struct token end = parser.parse_tokens();
+	std::cout << "\n-----------------------\n";
+	std::cout << "EVALUATING RESULTING TREE:\n";
+	inter->evalSTM(end);
+
+	return 1;
+}
+
+void
+print_tokens(std::vector<struct token> tokens){
+	for(struct token tok : tokens) {
+		std::cout << str_token(tok) << " ";
+	}
+	std::cout << '\n';
+}
+
+std::string
+str_token(struct token tok){
+	switch (tok.t) {
+		case token::TOK_ID:
+			return "ID(" + tok.value + ")";
+		case token::TOK_NUM:
+			return "NUM(" + tok.value + ")";
+		case token::TOK_OP:
+			return "OP(" + tok.value + ")";
+		case token::TOK_ASSIGN:
+			return "ASSIGN ";
+		case token::TOK_SEMI:
+			return "SEMI ";
+		case token::STM_ASSIGN:
+			return "STM_ASSIGN( " + str_token(*tok.lvalue) + ", " + str_token(*tok.rvalue) + ")";
+		case token::STM_COMPOUND:
+			return "STM_COMPOUND( " + str_token(*tok.lvalue) + ", " + str_token(*tok.rvalue) + ")";
+		case token::EXP_NUMBER:
+			return "EXP_NUMBER(" + tok.value + ")";
+		case token::EXP_OPERATION:
+			return "EXP_OPERATION( " + str_token(*tok.lvalue) + " " + tok.value + " " + str_token(*tok.rvalue) +")";
+		case token::EXP_ID:
+			return "EXP_ID ";
+		default:
+			return "SOMETHING";
+	}
+}
\ No newline at end of file
diff --git a/orga-comp.h b/orga-comp.h
new file mode 100644
index 0000000..c0017b5
--- /dev/null
+++ b/orga-comp.h
@@ -0,0 +1,80 @@
+#include <bits/types/FILE.h>
+#include <cstddef>
+#include <cstdio>
+#include <iostream>
+#include <fstream>
+#include <map>
+#include <list>
+#include <stack>
+#include <string>
+#include <vector>
+#include <assert.h>
+
+struct token {
+    enum type {
+        TOK_ID,
+        TOK_NUM,
+        TOK_OP,
+        TOK_ASSIGN,
+        TOK_DO,
+        TOK_END,
+        TOK_LPAREN,
+        TOK_RPAREN,
+        TOK_COMMA,
+        TOK_SEMI,
+        STM_ASSIGN,
+        STM_COMPOUND,
+        EXP_NUMBER,
+        EXP_ID,
+        EXP_OPERATION
+    };
+    type t;
+    std::string value;
+    struct token *lvalue;
+    struct token *rvalue;
+};
+
+void print_tokens(std::vector<struct token> tokens);
+std::string str_token(struct token tok);
+
+class interpreter {
+
+public:
+  void evalSTM(struct token stm);
+  int evalEXP(struct token exp);
+
+private:
+    std::map<std::string, int> table;
+};
+
+class lexer {
+    public:
+        std::vector<struct token> lex_file(std::string filename);
+    private:
+        std::vector<struct token> _tokens;
+        void add_token(token::type, std::string value);
+};
+
+class parser {
+    public:
+        parser(std::vector<struct token> tokens);
+        struct token parse_tokens();
+    private:
+        void reduce();
+        void reduce_num(struct token num);
+        void reduce_id(struct token id);
+        void reduce_stm(struct token stm);
+        void reduce_exp(struct token exp);
+        void statement();   //pops an statement into stack
+        void expression();  //pops an expression into stack
+        void err();
+        
+        struct token pop();
+        std::vector<struct token> _tokens;
+        std::stack<struct token> _stack;
+        size_t pos;
+};
+
+class translate {
+    
+};
\ No newline at end of file
diff --git a/parser.cpp b/parser.cpp
new file mode 100644
index 0000000..a8a179d
--- /dev/null
+++ b/parser.cpp
@@ -0,0 +1,203 @@
+#include "orga-comp.h"
+
+struct token
+parser::parse_tokens() {
+	// LR(k) parsing.
+	// Pushea al stack hasta encontrar una cantidad de token suficiente
+	// como para saber que hacer.
+	// El parse a su vez arma un abstract syntax tree.
+	if(pos < _tokens.size()) {
+		_stack.push(_tokens[pos]);
+		pos++;
+		//_stack.push(tok);
+		switch (_stack.top().t) {
+			case token::TOK_ID:
+				std::cout << "STATEMENT\n";
+				statement();
+				break;
+			case token::STM_COMPOUND:
+				break;
+			default:
+				err();
+				break;
+		}
+		return parse_tokens();
+	}
+	/*std::cout << "ESTADO FINAL DEL STACK:\n";
+	for(int i = 0; i < _stack.size(); i++) {
+		std::cout << str_token(pop()) << " ";
+	}*/
+
+	return _stack.top();
+	//check if reduce is possible, if it is reduce.
+}
+
+parser::parser(std::vector<struct token> tokens) {
+	_tokens = tokens;
+	pos = 0;
+}
+
+void
+parser::reduce() {
+	if(_stack.size() == 1) return;
+	struct token tok = pop();
+	
+	std::cout << str_token(tok) << " ";
+	switch (tok.t) {
+		case token::TOK_NUM:
+			std::cout << "reduzco numero\n";
+			reduce_num(tok);
+//			reduce();
+			break;
+        case token::EXP_ID:
+		case token::EXP_OPERATION:
+		case token::EXP_NUMBER:
+			// EL SIGUIENTE ES UN OP O UN ASSIGN
+			reduce_exp(tok);
+			break;
+        case token::TOK_ID:
+            reduce_id(tok);
+            break;
+		case token::TOK_SEMI:
+//			reduce();
+			break;
+//		case token::TOK_ID:
+			
+		case token::STM_ASSIGN:
+			reduce_stm(tok);
+		default: break;
+	}
+	reduce();
+}
+
+void
+parser::reduce_stm(struct token stm) {
+	struct token tok = pop();
+	struct token *tmp;
+	switch (tok.t) {
+		case token::STM_ASSIGN:
+		case token::STM_COMPOUND:
+			tmp = new struct token;
+			tmp->t = token::STM_COMPOUND;
+			tmp->rvalue = new struct token;
+			*tmp->rvalue = stm;
+			tmp->lvalue = new struct token;
+			*tmp->lvalue = tok;
+			_stack.push(*tmp);
+			std::cout << "CHAD STM REDUCER " << str_token(*tmp);
+			break;
+		default: 
+			err();
+			break;
+	}
+}
+
+void
+parser::reduce_id(struct token id) {
+    struct token *tmp = new struct token;
+	tmp->t = token::EXP_ID;
+	tmp->value = id.value;
+	_stack.push(*tmp);    
+}
+
+void
+parser::reduce_num(struct token num) {
+	struct token *tmp = new struct token;
+	tmp->t = token::EXP_NUMBER;
+	tmp->value = num.value;
+	_stack.push(*tmp);
+}
+
+void
+parser::reduce_exp(struct token exp) {
+	std::cout << "reducing exp: " << str_token(exp) << "\n";
+	struct token modifier = pop();
+	struct token *tmp;
+	struct token *stm;
+	switch (modifier.t) {
+		case token::TOK_ASSIGN:
+			std::cout << "assign found\n";
+			if(_stack.top().t != token::TOK_ID) err();
+			std::cout << str_token(_stack.top()) << "\n";
+			stm = new struct token;
+			stm->t = token::STM_ASSIGN;
+			stm->rvalue = new struct token;
+			*stm->rvalue = exp;
+			stm->lvalue = new struct token;
+			*stm->lvalue = pop();
+			_stack.push(*stm);
+		break;
+		case token::TOK_OP:
+			if(_stack.top().t == token::TOK_NUM) {
+				reduce_num(pop());
+			}
+            if(_stack.top().t == token::TOK_ID) {
+				reduce_id(pop());
+			}
+			stm = new struct token;
+			stm->t = token::EXP_OPERATION;
+            stm->value = modifier.value;
+			stm->rvalue = new struct token;
+			*stm->rvalue = exp;
+			stm->lvalue = new struct token;
+			*stm->lvalue = pop();
+			_stack.push(*stm);
+			//reduce_exp(pop());
+		break;
+		default: err();
+	}
+
+}
+
+struct token
+parser::pop() {
+	struct token tmp = _stack.top();
+	_stack.pop();
+	return tmp;
+}
+
+void
+parser::statement() {
+	_stack.push(_tokens[pos]);
+	pos++;
+	assert(_stack.top().t == token::TOK_ASSIGN);
+	expression();
+}
+
+void
+parser::expression() {
+	_stack.push(_tokens[pos]);
+	pos++;
+	std::cout << "POS: " << pos << '\n';
+	switch (_stack.top().t) {
+//		case token::EXP_NUMBER:
+//		case token::EXP_ID:
+		case token::TOK_ID:
+		case token::TOK_NUM:
+			expression();
+			break;
+		case token::EXP_OPERATION:
+			std::cout << "Nested operations not supported\n";
+			err();
+			break;
+		case token::TOK_OP:
+			expression();
+			break;
+		case token::TOK_SEMI:
+			std::cout << "REDUCE\n";
+			reduce();
+			break;
+		default: 
+			err();
+			break;;
+	}
+}
+
+void
+parser::err() {
+	std::cout
+	<< "unexpected symbol: "
+	<< str_token(_stack.top())
+	<< '\n';
+	exit(-1);
+}
diff --git a/tst.cfran b/tst.cfran
new file mode 100644
index 0000000..225c631
--- /dev/null
+++ b/tst.cfran
@@ -0,0 +1,6 @@
+a = 2 + 2;
+j = 2 + 1;
+h = 2 + 1;
+b = 4 + 8;
+p = a + 1;
+c = 2 - 1;
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