parse: add a basic function to report parse errors

bshell/parse/parse.c

@@ -1,6 +1,7 @@
 #include "parse.h"
 
 #include "../ast/ast.h"
+#include "../debug.h"
 #include "lex.h"
 #include "syntax.h"
 #include "token.h"
@@ -23,8 +24,32 @@ void parse_ctx_cleanup(struct parse_ctx *ctx)
 
 struct ast_node *parse_ctx_read_node(struct parse_ctx *ctx)
 {
+	parse_symbol(ctx, SYM_SEMICOLON);
+	parse_linefeed(ctx);
+
 	struct ast_node *result = NULL;
 	bool ok = parse_statement(ctx, &result);
 
 	return ok ? result : NULL;
 }
+
+void report_error(struct parse_ctx *ctx, const char *format, ...)
+{
+	ctx->p_status = BSHELL_ERR_BAD_SYNTAX;
+	fprintf(stderr, "PARSE: ");
+
+	va_list arg;
+	va_start(arg, format);
+	vfprintf(stderr, format, arg);
+	va_end(arg);
+
+	fprintf(stderr, "\n");
+
+	struct lex_token *tok = peek_token(ctx);
+	fprintf(stderr, "  peek_token = ");
+	if (tok) {
+		print_lex_token(tok);
+	} else {
+		fprintf(stderr, " EOF\n");
+	}
+}