Check for import name collisions

1 files changed, 22 insertions, 1 deletions

diff --git a/src/check.c b/src/check.c
index f6a8576..10ba2bf 100644
--- a/src/check.c
+++ b/src/check.c
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdnoreturn.h>
+#include <string.h>
 #include "lex.h"
 #include "parse.h"
 #include "util.h"
@@ -23,9 +24,29 @@ error(struct location loc, const char *fmt, ...)
 }
 
 static void
+check_import(struct ast_import *imports, int i)
+{
+	for (int j = 0; j < i; ++j) {
+		if (j == i) {
+			continue;
+		}
+
+		if (!strcmp(imports[j].name, imports[i].name)) {
+			error(imports[i].loc,
+				"import collision (previous import at %s:%d:%d)",
+				imports[j].loc.file,
+				imports[j].loc.line,
+				imports[j].loc.column);
+		}
+	}
+}
+
+static void
 check_imports(struct ast_import *imports, int n)
 {
-	/* TODO */
+	for (int i = 0; i < n; ++i) {
+		check_import(imports, i);
+	}
 }
 
 static void