Merge pull request #1 from Dayof/dev

Initial parser version

.gitignore

@@ -1 +1,3 @@
-cppython
+cppython
+*.tab.*
+*.yy.*

src/Makefile

@@ -0,0 +1,15 @@
+FILES	= parser.c lexer.c ast.c sym_tab.c main.c 
+CFLAGS	= -g -Wall -pedantic -x c
+CC		= gcc
+
+cppython:	$(FILES) ast.h sym_tab.h
+			$(CC) $(CFLAGS) $(FILES) -o cppython -lfl
+
+lexer.c:	cppython.lex
+			flex cppython.lex
+
+parser.c:	cppython.y
+			bison -d -v cppython.y
+
+clean:
+	rm -f *.o *~ lexer.c lexer.h parser.c parser.h parser.output cppython

src/README.md

@@ -3,46 +3,63 @@
 ## Requirements
 
 - Flex 2.6.4
+- Bison 3.5.1
 - GCC 9.3.0
 
 ## Usage
 
 ```bash
-$ chmod +x build.sh
-$ ./build.sh
-$ ./cppython tests/valid_1.ppy  # for valid test
-$ ./cppython tests/incorrect_1.ppy  # for invalid test
+$ make
+$ ./cppython tests/parser/valid_1.ppy  # for valid test
+$ ./cppython tests/parser/invalid_1.ppy  # for invalid test
 ```
 
 ## Output examples
 
 - Valid input 1:
-  - Commands: ./build.sh && ./cppython tests/valid_1.ppy
+  - Commands: ./cppython tests/parser/valid_1.ppy
   - Output: 
 
     ```bash
-    CPPython interpreter:
+		Welcome to CPPython interpreter:
+		Lexer/parser:
 
-    line 1.  <keyword, 'def'> <id, 1> <delimiter, '('> <id, 2> <delimiter, ','> <id, 3> <delimiter, ')'> <delimiter, ':'>
-    line 2.  <id, 4> <delimiter, '='> <integer, '1'>
-    line 3.  <id, 5> <operator, '+'> <delimiter, '='> <integer, '1'>
+		line 1. Token: <integer, '1'>
+
+		Creating integer expression node: 1
+		Token: <add, '+'>
+		Assign expression.
+		Token: <integer, '1'>
+
+		Creating integer expression node: 1
+
+		line 2. 
+		Assign expression.
+
+		Creating binary expression node: 1 + 1
+		1
+
+		AST created.
+
+		Lexer and parser finished.
     ```
 
 - Invalid input 2:
-  - Commands: ./build.sh && ./cppython tests/invalid_1.ppy
+  - Commands: ./cppython tests/parser/invalid_1.ppy
   - Output: 
 
     ```bash
-    CPPython interpreter:
+		Welcome to CPPython interpreter:
+		Lexer/parser:
+
+		line 1. Token: <integer, '1'>
+
+		Creating integer expression node: 1
 
-    line 1.  <keyword, 'def'> <id, 1> <delimiter, '('> <delimiter, ')'> <delimiter, ':'>
-    line 2.  <id, 2> <delimiter, '='> <integer, '1'>
-    line 3.  <id, 3> <operator, '+'> <delimiter, '='> <integer, '1'>
-    line 4.  <id, 4> <delimiter, '='>
-    LexerError: line 4, column 13, token '@' is not recognized
+		LexerError: line 1, column 2, token '^' is not recognized
     ```
 
 ## Author
 
 Name: Dayanne Fernandes da Cunha  
-University ID: 130107191
+University ID: 130107191

src/ast.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "ast.h"
+
+ast_node* create_bin_expr(char *operator, ast_node* left, ast_node* right) {
+    printf("\nCreating binary expression node: %d %s %d\n",
+           left->op.integer_expr, operator, right->op.integer_expr);
+    ast_node* expr = (ast_node*) malloc(sizeof(ast_node));
+    expr->op.binary_expr.operator = operator;
+    expr->op.binary_expr.left = left;
+    expr->op.binary_expr.right = right;
+    return expr;
+}
+
+ast_node* create_int_expr(int value) {
+    printf("\n\nCreating integer expression node: %d\n", value);
+    ast_node* expr = (ast_node*) malloc(sizeof(ast_node));
+    expr->op.integer_expr = value;
+    return expr;
+}
+
+void create_ast(ast_node* expression) {
+    ast* ast_obj = (ast*) malloc(sizeof(ast));
+    ast_obj->head = expression;
+    ast_obj->next = NULL;
+    printf("\nAST created.\n");
+}
+
+ast_node* show(ast_node* expression) {
+    printf("\nAssign expression.\n");
+    return expression;
+}

src/ast.h

@@ -0,0 +1,31 @@
+#ifndef __AST_H__
+#define __AST_H__
+
+int line, column;
+
+typedef struct exp {
+    union { 
+        int integer_expr;
+        char *string_expr;
+        char *variable_expr;
+        struct { 
+            char *operator;
+            struct exp* left;
+            struct exp* right;
+        } binary_expr;
+      } op;
+} ast_node;
+
+typedef struct expr_list { 
+    ast_node* head;
+    struct expr_list* next;
+} ast;
+
+void create_ast(ast_node* expression);
+ast_node* show(ast_node* expression);
+ast_node* create_int_expr(int value);
+ast_node* create_bin_expr(char *operator, ast_node* left, ast_node* right);
+
+void handle_token(int token);
+
+#endif // __AST_H__