Merge pull request #16 from cimplec/comments

Fix: single and multi line comments

compiler.py

@@ -290,7 +290,7 @@ def compile(opcodes, c_filename, table):
             code = "\tif(%s) {\n" % opcode.val
         # If opcode is of type exit then generate exit statement
         elif opcode.type == "exit":
-            code = "\texit(%s);" % opcode.val
+            code = "\texit(%s);\n" % opcode.val
         # If opcode is of type else_if then generate else if statement
         elif opcode.type == "else_if":
             code = "\telse if(%s) {\n" % opcode.val
@@ -306,6 +306,12 @@ def compile(opcodes, c_filename, table):
         # If opcode is of type continue then generate continue statement
         elif opcode.type == "continue":
             code += "\tcontinue;\n"
+        # If opcode is of type single_line_comment the generate single comment line
+        elif opcode.type == "single_line_comment":
+            code += "\t// %s \n" % opcode.val
+        # If opcode is of type multi_line_comment the generate single comment line
+        elif opcode.type == "multi_line_comment":
+            code += "/* %s*/\n" %opcode.val
         # If opcode is of type switch then generate switch statement
         elif opcode.type == "switch":
             code += "\tswitch(" + opcode.val + ") {\n";

lexical_analyzer.py

@@ -248,6 +248,9 @@ def lexical_analyze(filename, table):
     # Parantheses checker for detecting function call
     parantheses_count = 0
 
+    # To store comment string
+    comment_str = ""
+
     # Loop through the source code character by character
     i = 0
     while source_code[i] != "\0":
@@ -354,6 +357,22 @@ def lexical_analyze(filename, table):
             if source_code[i + 1] == "=":
                 tokens.append(Token("divide_equal", "", line_num))
                 i += 2
+            # to check if it is a single line comment
+            elif source_code[i+1] == "/":
+                i += 2
+                while source_code[i] != "\n":
+                    comment_str += str(source_code[i])
+                    i += 1
+                tokens.append(Token("single_line_comment", comment_str, line_num))
+                comment_str = ""
+            # to check if it is a multi line comment
+            elif source_code[i+1] == "*":
+                i += 2
+                while source_code[i] != "*" and source_code[i+1] != "/":
+                    comment_str += str(source_code[i])
+                    i += 1
+                tokens.append(Token("multi_line_comment", comment_str, line_num))
+                comment_str = ""
             else:
                 tokens.append(Token("divide", "", line_num))
                 i += 1

simc_parser.py

@@ -206,7 +206,6 @@ def expression(
                         "double": "%lf",
                     }
                     for var in vars:
-                        print(var)
                         _, type, _ = table.get_by_id(table.get_by_symbol(var))
                         if type == "var":
                             error("Unknown variable %s" % var, tokens[i].line_num)
@@ -1205,6 +1204,14 @@ def parse(tokens, table):
         elif tokens[i].type == "continue":
             op_codes.append(OpCode("continue", "", ""))
             i += 1
+        # If token is of type single_line_statement then generate single_line_comment opcode
+        elif tokens[i].type == "single_line_comment":
+            op_codes.append(OpCode("single_line_comment", tokens[i].val, ""))
+            i += 1
+        # If token is of type multi_line_statement then generate multi_line_comment opcode
+        elif tokens[i].type == "multi_line_comment":
+            op_codes.append(OpCode("multi_line_comment", tokens[i].val, ""))
+            i += 1
         # If token is of type switch then generate switch opcode
         elif tokens[i].type == "switch":
             switch_opcode, i, func_ret_type = switch_statement(tokens, i+1, table, func_ret_type)

test.c

@@ -1,19 +1,19 @@
 #include <stdio.h>
 
+int sum(int a, int b) {
+
+	return a + b;
+}
+/*
+  Code written by:- Siddhartha
+  Main starts
+*/
+
 int main() {
-	int a = 1;
-	int b = 2;
-	switch(a + b) {
-	case 1:
-	printf("Hello");
-	break;
-	case 2:
-	printf("World");
-	break;
-	default:
-	printf("Default");
-	break;
-	}
+	int hello = sum(1, 2);
+	printf("The sum = %d", hello);
+	exit(0);
+	//  testing single line comment
 
 	return 0;
 }

test.simc

@@ -1,5 +1,18 @@
+fun sum(a, b) {
+  return a + b
+}
+
+/*
+  Code written by:- Siddhartha
+  Main starts
+*/
+
 MAIN
-  var a = 1
-  var b = 2
-  var char = 1
+  var hello = sum(1, 2)
+  print("The sum = {hello}")
+  exit (0)
+
+  // testing single line comment
+
 END_MAIN
+