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lang: ast: implement cascade operator parsing

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max 🍓
2024-12-03 21:57:44 +00:00
parent 16ab13d738
commit 051cb1d2c2
7 changed files with 294 additions and 35 deletions
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23
lang/ast/expr/expr.h
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@@ -23,12 +23,16 @@ enum expr_subtype {
EXPR_SUBTYPE_NONE = 0,
/* generic parenthesis-enclosed arithmetic expressions */
EXPR_SUBTYPE_PAREN,
/* any kind of message */
EXPR_SUBTYPE_MSG,
/* keyword messages */
EXPR_SUBTYPE_KEYWORD_MSG,
/* expression delimited by labels */
EXPR_SUBTYPE_KEYWORD_ARG,
/* complex messages */
EXPR_SUBTYPE_COMPLEX_MSG,
/* message cascade operation */
EXPR_SUBTYPE_CASCADE,
};
enum expr_component {
@@ -41,6 +45,8 @@ enum expr_component {
struct expr_parser_state {
struct parser_state s_base;
enum expr_type s_type;
enum expr_subtype s_sub_type;
/* for arithmetic expressions, this records whether the previous
* component (either a token or parenthesised group of tokens) is an
* operator, operand, or message */
@@ -52,14 +58,15 @@ struct expr_parser_state {
* of parentheses that this sub-expression is at */
unsigned int s_paren_depth;
/* if this expression is parsing a sub-component of a larger expression,
* the depth of the expression is recorded here. */
unsigned int s_subexpr_depth;
/* when this is set, the expression will be terminated when the
* specified token is encountered. the token that terminated the
* expression will not be consumed. */
unsigned int s_terminator;
/* all sub-expressions (i.e. those conatained within brackets,
* keyword-messages and keyword-message args, etc) will have this set/ */
enum expr_subtype s_subexpr;
b_queue s_output_queue;
b_queue s_operator_stack;
@@ -68,7 +75,13 @@ struct expr_parser_state {
struct ivy_ast_node *s_recipient;
struct ivy_ast_msg_node *s_msg;
b_queue s_labels;
b_queue s_args;
union {
/* for keyword-messages, this is a list of arg values. */
b_queue s_args;
/* for cascade operators, this is a list of messages to send to the recipient. */
b_queue s_cascade_msg;
};
};
extern void arith_push_operator(
@@ -91,6 +104,8 @@ extern struct token_parse_result arith_parse_left_paren(
struct ivy_parser *ctx, struct ivy_token *tok);
extern struct token_parse_result arith_parse_right_paren(
struct ivy_parser *ctx, struct ivy_token *tok);
extern struct token_parse_result arith_parse_semicolon(
struct ivy_parser *ctx, struct ivy_token *tok);
extern struct token_parse_result arith_parse_dot(
struct ivy_parser *ctx, struct ivy_token *tok);