From e0be66bbb4920d4ac30cf4a84118c281374feb67 Mon Sep 17 00:00:00 2001
From: kdx <kikoodx@paranoici.org>
Date: Wed, 14 Jun 2023 03:54:46 +0200
Subject: empty statements

---
 src/main.c | 18 ++++++++++++++++++
 testing.sh | 17 ++++++++++-------
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/src/main.c b/src/main.c
index ea7e8ec..84cf8dc 100644
--- a/src/main.c
+++ b/src/main.c
@@ -213,6 +213,7 @@ typedef enum {
 	NOD_NUM, // integer
 	NOD_STRING, // ""
 	NOD_DEREF, // [a]
+	NOD_EMPTY_STMT,
 	NOD_BLOCK_STMT,
 	NOD_EXPR_STMT,
 	NOD_RETURN_STMT,
@@ -339,6 +340,7 @@ void define(Token **rest, Token *tok);
 static Node *global(Token **rest, Token *tok);
 static Node *local(Token **rest, Token *tok);
 static Node *expr(Token **rest, Token *tok);
+static Node *empty_stmt(Token **rest, Token *tok);
 static Node *block_stmt(Token **rest, Token *tok);
 static Node *expr_stmt(Token **rest, Token *tok);
 static Node *return_stmt(Token **rest, Token *tok);
@@ -657,6 +659,8 @@ primary(Token **rest, Token *tok)
 static Node *
 stmt(Token **rest, Token *tok)
 {
+	if (equal(tok, ";"))
+		return empty_stmt(rest, tok);
 	if (equal(tok, "{"))
 		return block_stmt(rest, tok);
 	if (equal(tok, "if"))
@@ -693,10 +697,22 @@ stmt(Token **rest, Token *tok)
 	return expr_stmt(rest, tok);
 }
 
+static Node *
+empty_stmt(Token **rest, Token *tok)
+{
+	*rest = skip(tok, ";");
+	return new_node(NOD_EMPTY_STMT);
+}
+
 static Node *
 block_stmt(Token **rest, Token *tok)
 {
 	tok = skip(tok, "{");
+	if (equal(tok, "}")) {
+		*rest = tok->next;
+		return new_node(NOD_EMPTY_STMT);
+	}
+
 	Node *const node = new_node(NOD_BLOCK_STMT);
 
 	Node head = {0};
@@ -1035,6 +1051,8 @@ gen_stmt(Node *node, Node *fname, int break_lbl)
 	static int label = 0;
 	int lbl;
 	switch (node->type) {
+	case NOD_EMPTY_STMT:
+		break;
 	case NOD_BLOCK_STMT:
 		node = node->lhs;
 		while (node != NULL) {
diff --git a/testing.sh b/testing.sh
index 9781638..fe19039 100755
--- a/testing.sh
+++ b/testing.sh
@@ -13,14 +13,14 @@ test() {
 }
 
 tup -q || ./build.sh || exit 1
-test "$1" "main(){5 + 2; return 4;}"
-test "$1" "main(){6 + 3;}"
-test "$1" "main(){'a' - 'b';}"
-test "$1" "main(){ buzz(); } buzz() { return 42; }"
-test "$1" "main(){ fizz(50 + buzz() - 3) * 4; } fizz() { return 3; } buzz() { return 42; }"
+test "$1" "main() {5 + 2; return 4;}"
+test "$1" "main() {6 + 3;}"
+test "$1" "main() {'a' - 'b';}"
+test "$1" "main() { buzz(); } buzz() { return 42; }"
+test "$1" "main() { fizz(50 + buzz() - 3) * 4; } fizz() { return 3; } buzz() { return 42; }"
 test "$1" "global abc; main(){ return abc; }"
-test "$1" "global abc = 5; main(){ return abc; }"
-test "$1" "main(){ return abc; } global abc = 5;"
+test "$1" "global abc = 5; main() { return abc; }"
+test "$1" "main() { return abc; } global abc = 5;"
 test "$1" "global abc = 5; main(){ inc(); return abc; } inc() { abc = abc + 1; }"
 test "$1" "main() { wrt('H'); wrt('e'); wrt('l'); wrt('l'); wrt('o'); wrt('!'); wrt('\n'); }"
 test "$1" "main() { a(a(0)); } a(x) { return x + 1; }"
@@ -57,4 +57,7 @@ test "$1" "main() { local a; a = 5; dbg a; a++; dbg a; }"
 test "$1" "main() { local a; a = 5; dbg a; a--; dbg a; }"
 test "$1" "main() { wrt [\"(\"]; wrt '\n'; }"
 test "$1" "main() { wrt inc('0') |> dec() |> inc() |> inc(); wrt '\n'; } inc(a) return a + 1; dec(a) return a - 1;"
+test "$1" "main();"
+test "$1" "main() {}"
+test "$1" "main() {;;;;;;;;;;;;;;;;;}"
 rm -f build/tmp.*
-- 
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