lang: ast: re-factor parser into multiple files

lang/ast/unit-package.c

@@ -0,0 +1,73 @@
+#include "unit-package.h"
+
+#include "ctx.h"
+#include "node.h"
+
+static enum ivy_status parse_dot(struct ivy_parser *ctx, struct ivy_token *tok)
+{
+	struct unit_package_parser_state *state
+		= parser_get_state(ctx, struct unit_package_parser_state);
+
+	if (state->s_prev_token != IVY_TOK_IDENT) {
+		return IVY_ERR_BAD_SYNTAX;
+	}
+
+	state->s_prev_token = IVY_SYM_DOT;
+	return IVY_OK;
+}
+
+static enum ivy_status parse_ident(struct ivy_parser *ctx, struct ivy_token *tok)
+{
+	struct unit_package_parser_state *state
+		= parser_get_state(ctx, struct unit_package_parser_state);
+
+	if (state->s_prev_token == IVY_TOK_IDENT) {
+		return IVY_ERR_BAD_SYNTAX;
+	}
+
+	state->s_prev_token = IVY_TOK_IDENT;
+	return IVY_OK;
+}
+
+static enum ivy_status parse_linefeed(struct ivy_parser *ctx, struct ivy_token *tok)
+{
+	struct unit_package_parser_state *state
+		= parser_get_state(ctx, struct unit_package_parser_state);
+
+	if (state->s_prev_token != IVY_TOK_IDENT) {
+		return IVY_ERR_BAD_SYNTAX;
+	}
+
+	return IVY_ERR_IO_FAILURE;
+}
+
+static enum ivy_status add_child(
+	struct ivy_ast_node *parent, struct ivy_ast_node *child)
+{
+	return IVY_OK;
+}
+
+static void print(struct ivy_ast_node *node)
+{
+}
+
+static void init_state(struct parser_state *sp)
+{
+	struct unit_package_parser_state *state
+		= (struct unit_package_parser_state *)sp;
+	state->s_prev_token = IVY_KW_PACKAGE;
+}
+
+struct ast_node_type unit_package_node_ops = {
+	.n_add_child = add_child,
+        .n_print = print,
+	.n_init_state = init_state,
+	.n_symbol_parsers = {
+		[IVY_SYM_DOT] = parse_dot,
+	},
+	.n_token_parsers = {
+		[IVY_TOK_IDENT] = parse_ident,
+		[IVY_TOK_LINEFEED] = parse_linefeed,
+	}
+
+};