Convert to c++

src/Makefile

@@ -1,18 +1,19 @@
 .PHONY: all clean
 all: deelang
+CC = g++
 
 lexer.o lexer.h: parser.h lexer.l
-	flex -o lexer.c --header-file=lexer.h lexer.l
-	$(CC) -c lexer.c
-	rm lexer.c
+	flex -o lexer.cpp --header-file=lexer.h lexer.l
+	$(CC) -c lexer.cpp
+	rm lexer.cpp
 
 parser.h parser.o: parser.y
-	bison -o parser.c --header=parser.h parser.y
-	$(CC) -c parser.c
-	rm parser.c
+	bison -o parser.cpp --header=parser.h parser.y
+	$(CC) -c parser.cpp
+	rm parser.cpp
 
-deelang: deelang.c lexer.o parser.o syntax.o
+deelang: deelang.cpp lexer.o parser.o syntax.o
 	$(CC) -o $@ $^
 
 clean:
-	rm -rf parser.o lexer.o parser.h lexer.h deelang
+	rm -rf *.o parser.h lexer.h deelang

src/deelang.cpp

@@ -2,7 +2,11 @@
 #include "lexer.h"
 #include "parser.h"
 
-void main() {
+using namespace std;
+
+int main() {
   yydebug = 1;
   yyparse();
+  
+  return 0;
 }

src/lexer.l

@@ -1,12 +1,13 @@
 %{
+#include <stack>
 #include "syntax.h"
 #include "parser.h"
-int stack[100]; // Max indentation depth
-int sp = -1;
-int peek();
-void push(int a);
-void pop();
-#define YY_USER_INIT push(0); BEGIN(freshline);
+using namespace std;
+
+stack<int> s;
+
+#define YY_USER_INIT s.push(0); BEGIN(freshline);
+
 %}
 
 %option noyywrap
@@ -18,20 +19,20 @@ letter	[A-Za-z]
 
 %%
 <freshline>""/[^\t ]		{
-if (peek() == 0) {
+if (s.top() == 0) {
    BEGIN(0);
 } else {
-  pop(); yyless(0); return DEDENT;
+  s.pop(); yyless(0); return DEDENT;
 }
 				}
 <freshline>[ \t]+		{
-if (peek() == yyleng) {
+if (s.top() == yyleng) {
   BEGIN(0); // Same indentation, continue
-} else if (peek() > yyleng) {
-  pop(); yyless(0); return DEDENT;
+} else if (s.top() > yyleng) {
+  s.pop(); yyless(0); return DEDENT;
   // Same rule again until the stack is even
 } else {
-  push(yyleng); BEGIN(0); return INDENT;
+  s.push(yyleng); BEGIN(0); return INDENT;
 }
 	       			}
 #[^\n]*					// Eat comments
@@ -49,20 +50,4 @@ elif 					return ELIF;
 "/"\n					// Eat newlines ending in /
 [\n;]					BEGIN(freshline); return STOP;
 .					fprintf(stderr, "Scanning error!\nOffender: %s\n", yytext); exit(1);
-%%
-
-int peek() {
-    printf("Peek @ %d\n", stack[sp]);
-    return stack[sp];
-}
-
-void push(int a) {
-     printf("Push @ %d\n", a);
-     sp++;
-     stack[sp] = a;
-}
-
-void pop() {
-     printf("Pop! Sp @ %d\n", sp);
-     sp--;
-}
+%%

src/parser.y

@@ -1,25 +1,23 @@
 %{
 #include <stdio.h>
 #include "syntax.h"
+using namespace std;
+
 int yylex();
-int yyerror(const char* p) { fprintf(stderr, p); }
+void yyerror(const char* p) { fprintf(stderr, p); }
 %}
 
 %define parse.trace
 
 %union {
-       expr_t expr;
-       binop_t binop;
-       atom_t id;
-       num_t num;
+       float num;
        char *sym;
-       string_t string;
-       object_t object;
+       Node *node;
 }
 
-%token <id> ID
+%token <sym> ID
 %token <num> NUM
-%token <string> STRING
+%token <sym> STRING
 
 %token STOP
 %token INDENT DEDENT
@@ -31,8 +29,7 @@ int yyerror(const char* p) { fprintf(stderr, p); }
 %left '/' '*'
 %left MAPS
 
-%nterm <expr> expr
-%nterm <object> objdef
+%nterm <node> expr
 
 %%
 program:	statements | statements statement;
@@ -44,16 +41,16 @@ assignment: 	ID GETS expr;
 assignments: 	assignments assignment STOP | // null production;
 expr:		funcdef
 		| funcall
-		| objdef { $$.type = DEE_OBJ; $$.object = $1;}
-		| expr CAT expr { $$ = make_binop(CAT, $1, $3); }
-		| expr '+' expr { $$ = make_binop('+', $1, $3); }
-		| expr '-' expr { $$ = make_binop('-', $1, $3); }
-		| expr '*' expr { $$ = make_binop('*', $1, $3); }
-		| expr '/' expr { $$ = make_binop('/', $1, $3); }
+		| objdef
+		| expr CAT expr { $$ = new OpNode(CAT, $1, $3); }
+		| expr '+' expr { $$ = new OpNode('+', $1, $3); }
+		| expr '-' expr { $$ = new OpNode('-', $1, $3); }
+		| expr '*' expr { $$ = new OpNode('*', $1, $3); }
+		| expr '/' expr { $$ = new OpNode('/', $1, $3); }
 		| '(' expr ')' {$$ = $2;}
-		| ID {$$.id = $1; $$.type = DEE_ID;}
-		| NUM {$$.num = $1; $$.type = DEE_NUM;}
-		| STRING {$$.string = $1; $$.type = DEE_STR;};
+		| ID {$$ = new IdNode($1);}
+		| NUM {$$ = new NumNode($1);}
+		| STRING {$$ = new StringNode($1);};
 		
 funcdef: 	param MAPS expr | param MAPS block;
 param:	 	ID | '_' | // null production;

src/stack.hh

@@ -0,0 +1,8 @@
+// A Bison parser, made by GNU Bison 3.8.2.
+
+// Starting with Bison 3.2, this file is useless: the structure it
+// used to define is now defined with the parser itself.
+//
+// To get rid of this file:
+// 1. add '%require "3.2"' (or newer) to your grammar file
+// 2. remove references to this file from your build system.

src/syntax.c

@@ -1,15 +0,0 @@
-#include <string.h>
-#include <stdlib.h>
-
-#include "syntax.h"
-
-expr_t make_binop(int op, expr_t first, expr_t second) {
-  expr_t myexpr;
-  myexpr.type = DEE_BINOP;
-  myexpr.binop.op = op;
-  myexpr.binop.first = (expr_t*) malloc(sizeof(expr_t));
-  myexpr.binop.second = (expr_t*) malloc(sizeof(expr_t));
-  memcpy(myexpr.binop.first, &first, sizeof(expr_t));
-  memcpy(myexpr.binop.second, &second, sizeof(expr_t));
-  return myexpr;
-}

src/syntax.cpp

@@ -0,0 +1,22 @@
+#include <string.h>
+#include <stdlib.h>
+
+#include "syntax.h"
+
+IdNode::IdNode(char * id) {
+  this->id = id;
+}
+
+NumNode::NumNode(float num) {
+  this->num = num;
+}
+
+StringNode::StringNode(char *str) {
+  this->string = string;
+}
+
+OpNode::OpNode(int op, Node *first, Node *second) {
+  this->op = op;
+  this->first = first;
+  this->second = second;
+}

src/syntax.h

@@ -1,40 +1,37 @@
 #ifndef SYNTAX_H
 #define SYNTAX_H
 
-typedef float num_t;
-typedef char* atom_t;
-typedef char* string_t;
-typedef struct expr_t expr_t;
-typedef struct binop_t binop_t;
-typedef struct object_t object_t;
-typedef struct function_t function_t;
-typedef struct block_t block_t;
+class Node {};
 
-#define DEE_BINOP 1
-#define DEE_ID    2
-#define DEE_NUM   3
-#define DEE_STR   4
-#define DEE_OBJ   5
+class IdNode : public Node {
+private:
+  char* id;
+public:
+  IdNode(char*);
+};
 
-struct binop_t {
-  expr_t *first;
-  expr_t *second;
+class NumNode : public Node {
+private:
+  float num;
+public:
+  NumNode(float);
+};
+
+class StringNode : public Node {
+private:
+  char* string;
+public:
+  StringNode(char*);
+};
+
+class OpNode : public Node {
+private:
   int op;
+  Node *first;
+  Node *second;
+public:
+  OpNode(int, Node*, Node*);
 };
 
-struct object_t {};
-
-struct expr_t {
-  int type;
-  union {
-    atom_t id;
-    num_t num;
-    string_t string;
-    binop_t binop;
-    object_t object;
-  };
-};
-
-expr_t make_binop(int, expr_t, expr_t);
 
 #endif /* SYNTAX_H */