From 7648643b7f25b7752aacef9e758cf28372529ab4 Mon Sep 17 00:00:00 2001
From: kdx <kikoodx@paranoici.org>
Date: Mon, 12 Jun 2023 19:52:17 +0200
Subject: postfix operators are gucci

---
 samples/helloworld.golem |  2 +-
 src/main.c               | 56 ++++++++++++++++++++++++++++++++++++++++++++++--
 testing.sh               |  5 ++++-
 3 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/samples/helloworld.golem b/samples/helloworld.golem
index 2e0d82c..37698c0 100644
--- a/samples/helloworld.golem
+++ b/samples/helloworld.golem
@@ -10,7 +10,7 @@ main() {
 
 	i = 0;
 	loop {
-		i = i + 1;
+		i++;
 		if (i > iterations)
 			break;
 		print(str);
diff --git a/src/main.c b/src/main.c
index 6337b1d..de84ea4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -90,6 +90,8 @@ is_punct(const char *p)
 {
 	if (strchr("=!<>", p[0]) != NULL && p[1] == '=')
 		return 2;
+	if (strchr("-+", p[0]) != NULL && p[0] == p[1])
+		return 2;
 
 	return (strchr("+-/*()<>,;{}[]=&^|", p[0]) != NULL);
 }
@@ -198,6 +200,7 @@ typedef enum {
 	NOD_DBG_STMT,
 	NOD_WRT_STMT,
 	NOD_ASSIGN_STMT,
+	NOD_POSTFIX_STMT,
 	NOD_IFELSE_STMT,
 	NOD_LOOP_STMT,
 	NOD_FUN,
@@ -280,8 +283,6 @@ new_node(NodeType type)
 static Node *
 new_word(Token *tok)
 {
-	expect(tok, TOK_WORD);
-
 	Node *const node = new_node(NOD_WORD);
 	node->loc = tok->loc;
 	node->len = tok->len;
@@ -324,6 +325,7 @@ static Node *break_stmt(Token **rest, Token *tok);
 static Node *slp_stmt(Token **rest, Token *tok);
 static Node *dbg_stmt(Token **rest, Token *tok);
 static Node *wrt_stmt(Token **rest, Token *tok);
+static Node *postfix_stmt(Token **rest, Token *tok);
 static Node *assign_stmt(Token **rest, Token *tok);
 static Node *ifelse_stmt(Token **rest, Token *tok);
 static Node *loop_stmt(Token **rest, Token *tok);
@@ -652,6 +654,8 @@ stmt(Token **rest, Token *tok)
 	}
 	if (equal(tok->next, "="))
 		return assign_stmt(rest, tok);
+	if (equal(tok->next, "++") || equal(tok->next, "--"))
+		return postfix_stmt(rest, tok);
 	return expr_stmt(rest, tok);
 }
 
@@ -727,6 +731,19 @@ wrt_stmt(Token **rest, Token *tok)
 	return node;
 }
 
+static Node *
+postfix_stmt(Token **rest, Token *tok)
+{
+	Node *lhs;
+	expect(tok, TOK_WORD);
+	lhs = new_word(tok);
+	tok = tok->next;
+	expect(tok, TOK_PUNCT);
+	Node *const node = new_binary(NOD_POSTFIX_STMT, lhs, new_word(tok));
+	*rest = skip(tok->next, ";");
+	return node;
+}
+
 static Node *
 assign_stmt(Token **rest, Token *tok)
 {
@@ -941,6 +958,38 @@ gen_assign_stmt(Node *node)
 	}
 }
 
+static void
+gen_postfix_stmt(Node *node)
+{
+	const int found = node_find(locals, node->lhs);
+
+	if (found != -1) {
+		printf("\tLIT ,__stack_ptr LDA\n");
+		if (locals_size - found - 1)
+			printf("\tLIT %04x SUB\n",
+			       locals_size - found - 1);
+	} else
+		printf("\tLIT ,__gl_%.*s\n",
+		       node->lhs->len, node->lhs->loc);
+	printf("\tLDA\n");
+
+	if (node_equal(node->rhs, "++"))
+		printf("\tINC\n");
+	else if (node_equal(node->rhs, "--"))
+		printf("\tDEC\n");
+
+	if (found != -1) {
+		printf("\tLIT ,__stack_ptr LDA\n");
+		if (locals_size - found - 1)
+			printf("\tLIT %04x SUB\n",
+			       locals_size - found - 1);
+	} else
+		printf("\tLIT ,__gl_%.*s\n",
+		       node->lhs->len, node->lhs->loc);
+
+	printf("\tSTA\n");
+}
+
 static void
 gen_stmt(Node *node, Node *fname, int break_lbl)
 {
@@ -989,6 +1038,9 @@ gen_stmt(Node *node, Node *fname, int break_lbl)
 	case NOD_ASSIGN_STMT:
 		gen_assign_stmt(node);
 		break;
+	case NOD_POSTFIX_STMT:
+		gen_postfix_stmt(node);
+		break;
 	case NOD_IFELSE_STMT:
 		lbl = label;
 		label += 1 + (node->rhs->next != NULL);
diff --git a/testing.sh b/testing.sh
index 6db3877..b34667e 100755
--- a/testing.sh
+++ b/testing.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-function test() {
+test() {
 	QUIET="$1"
 	CODE="$2"
 	echo "--- $CODE ---"
@@ -52,4 +52,7 @@ test "$1" "main() { local a; dbg a; inc(&a); dbg a; } inc(p) { [p] = [p] + 1; }"
 test "$1" "global a; main() { dbg a; inc(&a); dbg a; } inc(p) { [p] = [p] + 1; }"
 test "$1" "main() 0; //ayayayayayayaya comment"
 test "$1" "main() return;"
+test "$1" "main() { local a; a = 5; dbg a; a++; dbg a; }"
+test "$1" "main() { local a; a = 5; dbg a; a--; dbg a; }"
+exit
 rm -f build/tmp.*
-- 
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