lang: ast: re-factor expression parser into multiple files

lang/ast/expr/expr.c

@@ -0,0 +1,36 @@
+#include "expr.h"
+
+#include "../node.h"
+
+static enum ivy_status add_child(
+	struct parser_state *parent, struct ivy_ast_node *child)
+{
+	struct expr_parser_state *state = (struct expr_parser_state *)parent;
+	switch (state->s_type) {
+	case EXPR_TYPE_STMT:
+		return IVY_ERR_NOT_SUPPORTED;
+	case EXPR_TYPE_ARITH:
+		return arith_add_child(parent, child);
+	default:
+		return IVY_ERR_NOT_SUPPORTED;
+	}
+}
+
+struct ast_node_type expr_node_ops = {
+	.n_add_child = add_child,
+	.n_state_size = sizeof(struct expr_parser_state),
+        .n_node_size = sizeof(struct ivy_ast_expr_node),
+        .n_token_parsers = {
+		TOK_PARSER(IDENT, arith_parse_ident),
+		TOK_PARSER(INT, arith_parse_operand),
+		TOK_PARSER(DOUBLE, arith_parse_operand),
+		TOK_PARSER(STRING, arith_parse_operand),
+		TOK_PARSER(SYMBOL, arith_parse_operator),
+		TOK_PARSER(LABEL, arith_parse_label),
+	},
+	.n_symbol_parsers = {
+		SYM_PARSER(LEFT_PAREN, arith_parse_left_paren),
+		SYM_PARSER(RIGHT_PAREN, arith_parse_right_paren),
+		SYM_PARSER(DOT, arith_parse_dot),
+	},
+};