From 61b85f238240519373010ce502e57622a2af05cb Mon Sep 17 00:00:00 2001
From: kdx <kdx@42l.fr>
Date: Sun, 22 Jan 2023 03:16:15 +0100
Subject: handle comments and global declaration

---
 Token.h    |  1 +
 baby.golem |  4 ----
 lexer.c    |  9 +++++++--
 parse.c    | 24 +++++++++++++++++++++++-
 4 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/Token.h b/Token.h
index 8f20b2e..7b4aa20 100644
--- a/Token.h
+++ b/Token.h
@@ -24,6 +24,7 @@ enum {
 	TOK_INCREMENT,
 	TOK_COMP_EQ,
 	TOK_COMP_NEQ,
+	TOK_COMMENT,
 	/* keywords */
 	TOK_KW_VAR,
 	TOK_KW_CONST,
diff --git a/baby.golem b/baby.golem
index c5a9368..b936f53 100644
--- a/baby.golem
+++ b/baby.golem
@@ -1,8 +1,4 @@
 // simple comment
-/* multi
-   line
-   comment */
-
 var stack;
 var heap = 0;
 
diff --git a/lexer.c b/lexer.c
index e55f97e..dd97785 100644
--- a/lexer.c
+++ b/lexer.c
@@ -43,6 +43,7 @@ static unsigned int two_wide_tok(const char *s)
 	case PAIR('+', '+'): return TOK_INCREMENT;
 	case PAIR('=', '='): return TOK_COMP_EQ;
 	case PAIR('!', '='): return TOK_COMP_NEQ;
+	case PAIR('/', '/'): return TOK_COMMENT;
 	default:             return TOK_NONE;
 	}
 }
@@ -73,6 +74,7 @@ Token *lexer(const char *s)
 		toks[tok_i].column = column;
 		toks[tok_i].line = line;
 		const char *rem_s = s;
+		const int two_wide = two_wide_tok(s);
 		if (*s == '"') {
 			const char *end = strchr(s + 1, '"');
 			if (end == NULL) {
@@ -120,8 +122,11 @@ Token *lexer(const char *s)
 			toks[tok_i].type = TOK_INTEGER;
 			tok_i += 1;
 			s += len;
-		} else if (two_wide_tok(s) != TOK_NONE) {
-			toks[tok_i].type = two_wide_tok(s);
+		} else if (two_wide == TOK_COMMENT) {
+			while (*s != '\0' && *s != '\n')
+				s += 1;
+		} else if (two_wide != TOK_NONE) {
+			toks[tok_i].type = two_wide;
 			toks[tok_i].v.c = *s;
 			tok_i += 1;
 			s += 2;
diff --git a/parse.c b/parse.c
index d562b57..922ce4d 100644
--- a/parse.c
+++ b/parse.c
@@ -3,6 +3,7 @@
 #include <stdio.h>
 
 static void *unexpected(const Token *tok, int n);
+static const Token *expression(const Token *tok);
 static const Token *keyword_fn(const Token *tok);
 static const Token *keyword_var(const Token *tok);
 static const Token *keyword_const(const Token *tok);
@@ -41,6 +42,17 @@ static void *unexpected(const Token *tok, int n)
 	return NULL;
 }
 
+static const Token *expression(const Token *tok)
+{
+	if (tok->type == TOK_INTEGER)
+		return tok + 1;
+	if (tok->type == TOK_STRING)
+		return tok + 1;
+	if (tok->type == TOK_WORD)
+		return tok + 1;
+	return unexpected(tok, 20);
+}
+
 static const Token *keyword_fn(const Token *tok)
 {
 	tok += 1;
@@ -73,8 +85,18 @@ static const Token *keyword_var(const Token *tok)
 	const Token *name = tok;
 	(void)name;
 	tok += 1;
-	if (tok->type != TOK_SEMICOLON)
+	/* no initialization */
+	if (tok->type == TOK_SEMICOLON)
+		return tok + 1;
+	if (tok->type != TOK_ASSIGN)
 		return unexpected(tok, 11);
+	tok += 1;
+	/* expression */
+	tok = expression(tok);
+	if (tok == NULL)
+		return NULL;
+	if (tok->type != TOK_SEMICOLON)
+		return unexpected(tok, 12);
 	return tok + 1;
 }
 
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