From 4d9368f569fda585817b1393257c99f32629e17d Mon Sep 17 00:00:00 2001
From: Thomas Bruce <tdb@tdbio.me>
Date: Wed, 19 Feb 2025 17:05:42 -0500
Subject: [PATCH] fix parse assignment
---
.gitignore | 1 +
parser.c | 17 ++++++++++++++++-
2 files changed, 17 insertions(+), 1 deletion(-)
create mode 100644 .gitignore
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..74e79bb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+next-to-add.c
diff --git a/parser.c b/parser.c
index 1446792..a02250e 100644
--- a/parser.c
+++ b/parser.c
@@ -99,6 +99,7 @@ static ASTNode* parseAdditive(void);
static ASTNode* parseTerm(void);
static ASTNode* parseFactor(void);
static ASTNode* parseDeclaration(void);
+static ASTNode* parseAssignment(void);
static ASTNode* parseStatement(void);
static ASTNode* parseCompoundStatement(void);
static ASTNode* parseFunctionDefinition(void);
@@ -208,7 +209,7 @@ static ASTNode* parseStatement(void) {
/* expression := equality */
static ASTNode* parseExpression(void) {
- return parseEquality();
+ return parseAssignment();
}
/* equality := additive ( "==" additive )* */
@@ -302,6 +303,20 @@ static ASTNode* parseDeclaration(void) {
return decl;
}
+static ASTNode* parseAssignment(void) {
+ ASTNode * node = parseEquality();
+ if (g_currentToken.kind == TK_ASSIGN) {
+ if (node->kind != AST_IDENT) {
+ fprintf(stderr, "Parse err: left side is not ident.");
+ exit(1);
+ }
+ nextToken();
+ ASTNode* rhs = parseAssignment();
+ node = newBinaryNode(node, rhs, "=");
+ }
+ return node;
+}
+
/* demonstration: ast printing*/
static void printIndent(int indent) {
--
2.39.5