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// Logic for parsing functions
#include <gc.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <unictype.h>
#include <uniname.h>
#include "../ast.h"
#include "../stdlib/util.h"
#include "context.h"
#include "controlflow.h"
#include "errors.h"
#include "expressions.h"
#include "functions.h"
#include "types.h"
#include "utils.h"
arg_ast_t *parse_args(parse_ctx_t *ctx, const char **pos) {
arg_ast_t *args = NULL;
for (;;) {
const char *batch_start = *pos;
ast_t *default_val = NULL;
type_ast_t *type = NULL;
typedef struct name_list_s {
const char *name;
struct name_list_s *next;
} name_list_t;
name_list_t *names = NULL;
for (;;) {
whitespace(ctx, pos);
const char *name = get_id(pos);
if (!name) break;
whitespace(ctx, pos);
if (match(pos, ":")) {
type = expect(ctx, *pos - 1, pos, parse_type, "I expected a type here");
names = new (name_list_t, .name = name, .next = names);
whitespace(ctx, pos);
if (match(pos, "="))
default_val = expect(ctx, *pos - 1, pos, parse_term, "I expected a value after this '='");
break;
} else if (strncmp(*pos, "==", 2) != 0 && match(pos, "=")) {
default_val = expect(ctx, *pos - 1, pos, parse_term, "I expected a value after this '='");
names = new (name_list_t, .name = name, .next = names);
break;
} else if (name) {
names = new (name_list_t, .name = name, .next = names);
spaces(pos);
if (!match(pos, ",")) break;
} else {
break;
}
}
if (!names) break;
if (!default_val && !type)
parser_err(ctx, batch_start, *pos,
"I expected a ':' and type, or '=' and a default value after this parameter (", names->name,
")");
REVERSE_LIST(names);
for (; names; names = names->next)
args = new (arg_ast_t, .name = names->name, .type = type, .value = default_val, .next = args);
if (!match_separator(ctx, pos)) break;
}
REVERSE_LIST(args);
return args;
}
ast_t *parse_func_def(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!match_word(&pos, "func")) return NULL;
ast_t *name = optional(ctx, &pos, parse_var);
if (!name) return NULL;
spaces(&pos);
expect_str(ctx, start, &pos, "(", "I expected a parenthesis for this function's arguments");
arg_ast_t *args = parse_args(ctx, &pos);
spaces(&pos);
type_ast_t *ret_type = match(&pos, "->") ? optional(ctx, &pos, parse_type) : NULL;
whitespace(ctx, &pos);
bool is_inline = false;
ast_t *cache_ast = NULL;
for (bool specials = match(&pos, ";"); specials; specials = match_separator(ctx, &pos)) {
const char *flag_start = pos;
if (match_word(&pos, "inline")) {
is_inline = true;
} else if (match_word(&pos, "cached")) {
if (!cache_ast) cache_ast = NewAST(ctx->file, pos, pos, Int, .str = "-1");
} else if (match_word(&pos, "cache_size")) {
whitespace(ctx, &pos);
if (!match(&pos, "=")) parser_err(ctx, flag_start, pos, "I expected a value for 'cache_size'");
whitespace(ctx, &pos);
cache_ast = expect(ctx, start, &pos, parse_expr, "I expected a maximum size for the cache");
}
}
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this function definition");
ast_t *body = expect(ctx, start, &pos, parse_block, "This function needs a body block");
return NewAST(ctx->file, start, pos, FunctionDef, .name = name, .args = args, .ret_type = ret_type, .body = body,
.cache = cache_ast, .is_inline = is_inline);
}
ast_t *parse_convert_def(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!match_word(&pos, "convert")) return NULL;
spaces(&pos);
if (!match(&pos, "(")) return NULL;
arg_ast_t *args = parse_args(ctx, &pos);
spaces(&pos);
type_ast_t *ret_type = match(&pos, "->") ? optional(ctx, &pos, parse_type) : NULL;
whitespace(ctx, &pos);
bool is_inline = false;
ast_t *cache_ast = NULL;
for (bool specials = match(&pos, ";"); specials; specials = match_separator(ctx, &pos)) {
const char *flag_start = pos;
if (match_word(&pos, "inline")) {
is_inline = true;
} else if (match_word(&pos, "cached")) {
if (!cache_ast) cache_ast = NewAST(ctx->file, pos, pos, Int, .str = "-1");
} else if (match_word(&pos, "cache_size")) {
whitespace(ctx, &pos);
if (!match(&pos, "=")) parser_err(ctx, flag_start, pos, "I expected a value for 'cache_size'");
whitespace(ctx, &pos);
cache_ast = expect(ctx, start, &pos, parse_expr, "I expected a maximum size for the cache");
}
}
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this function definition");
ast_t *body = expect(ctx, start, &pos, parse_block, "This function needs a body block");
return NewAST(ctx->file, start, pos, ConvertDef, .args = args, .ret_type = ret_type, .body = body,
.cache = cache_ast, .is_inline = is_inline);
}
ast_t *parse_lambda(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!match_word(&pos, "func")) return NULL;
spaces(&pos);
if (!match(&pos, "(")) return NULL;
arg_ast_t *args = parse_args(ctx, &pos);
spaces(&pos);
type_ast_t *ret = match(&pos, "->") ? optional(ctx, &pos, parse_type) : NULL;
spaces(&pos);
expect_closing(ctx, &pos, ")", "I was expecting a ')' to finish this anonymous function's arguments");
ast_t *body = optional(ctx, &pos, parse_block);
if (!body) body = NewAST(ctx->file, pos, pos, Block, .statements = NULL);
return NewAST(ctx->file, start, pos, Lambda, .id = ctx->next_lambda_id++, .args = args, .ret_type = ret,
.body = body);
}
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