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#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <unictype.h>
#include <uniname.h>
#include "../ast.h"
#include "../stdlib/datatypes.h"
#include "../stdlib/print.h"
#include "../stdlib/text.h"
#include "context.h"
#include "errors.h"
#include "expressions.h"
#include "functions.h"
#include "types.h"
#include "utils.h"
type_ast_t *parse_table_type(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!match(&pos, "{")) return NULL;
whitespace(ctx, &pos);
type_ast_t *key_type = parse_type(ctx, pos);
if (!key_type) return NULL;
pos = key_type->end;
whitespace(ctx, &pos);
type_ast_t *value_type = NULL;
if (match(&pos, "=")) {
value_type = expect(ctx, start, &pos, parse_type, "I couldn't parse the rest of this table type");
} else {
return NULL;
}
spaces(&pos);
ast_t *default_value = NULL;
if (match(&pos, ";") && match_word(&pos, "default")) {
expect_str(ctx, pos, &pos, "=", "I expected an '=' here");
default_value =
expect(ctx, start, &pos, parse_extended_expr, "I couldn't parse the default value for this table");
}
whitespace(ctx, &pos);
expect_closing(ctx, &pos, "}", "I wasn't able to parse the rest of this table type");
return NewTypeAST(ctx->file, start, pos, TableTypeAST, .key = key_type, .value = value_type,
.default_value = default_value);
}
type_ast_t *parse_func_type(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!match_word(&pos, "func")) return NULL;
spaces(&pos);
expect_str(ctx, start, &pos, "(", "I expected a parenthesis here");
arg_ast_t *args = parse_args(ctx, &pos);
spaces(&pos);
type_ast_t *ret = match(&pos, "->") ? optional(ctx, &pos, parse_type) : NULL;
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this function type");
return NewTypeAST(ctx->file, start, pos, FunctionTypeAST, .args = args, .ret = ret);
}
type_ast_t *parse_list_type(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!match(&pos, "[")) return NULL;
type_ast_t *type = expect(ctx, start, &pos, parse_type, "I couldn't parse a list item type after this point");
expect_closing(ctx, &pos, "]", "I wasn't able to parse the rest of this list type");
return NewTypeAST(ctx->file, start, pos, ListTypeAST, .item = type);
}
type_ast_t *parse_pointer_type(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
bool is_stack;
if (match(&pos, "@")) is_stack = false;
else if (match(&pos, "&")) is_stack = true;
else return NULL;
spaces(&pos);
type_ast_t *type =
expect(ctx, start, &pos, parse_non_optional_type, "I couldn't parse a pointer type after this point");
type_ast_t *ptr_type = NewTypeAST(ctx->file, start, pos, PointerTypeAST, .pointed = type, .is_stack = is_stack);
spaces(&pos);
while (match(&pos, "?"))
ptr_type = NewTypeAST(ctx->file, start, pos, OptionalTypeAST, .type = ptr_type);
return ptr_type;
}
type_ast_t *parse_enum_type(parse_ctx_t *ctx, const char *pos) {
// tagged union: enum(A, B(x:Int,y:Int)=5, ...)
const char *start = pos;
if (!match_word(&pos, "enum")) return NULL;
spaces(&pos);
if (!match(&pos, "(")) return NULL;
tag_ast_t *tags = NULL;
whitespace(ctx, &pos);
for (;;) {
spaces(&pos);
const char *tag_start = pos;
const char *tag_name = get_id(&pos);
if (!tag_name) break;
spaces(&pos);
arg_ast_t *fields;
bool secret = false;
if (match(&pos, "(")) {
whitespace(ctx, &pos);
fields = parse_args(ctx, &pos);
whitespace(ctx, &pos);
if (match(&pos, ";")) { // Extra flags
whitespace(ctx, &pos);
secret = match_word(&pos, "secret");
whitespace(ctx, &pos);
}
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this tagged union member");
} else {
fields = NULL;
}
tags = new (tag_ast_t, .file = ctx->file, .start = tag_start, .end = pos, .name = tag_name, .fields = fields,
.secret = secret, .next = tags);
if (!match_separator(ctx, &pos)) break;
}
whitespace(ctx, &pos);
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this enum definition");
REVERSE_LIST(tags);
Text_t name = Texts("enum$", (int64_t)(start - ctx->file->text));
return NewTypeAST(ctx->file, start, pos, EnumTypeAST, .name = name, .tags = tags);
}
type_ast_t *parse_type_name(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
const char *id = get_id(&pos);
if (!id) return NULL;
for (;;) {
const char *next = pos;
spaces(&next);
if (!match(&next, ".")) break;
const char *next_id = get_id(&next);
if (!next_id) break;
id = String(id, ".", next_id);
pos = next;
}
return NewTypeAST(ctx->file, start, pos, VarTypeAST, .name = id);
}
type_ast_t *parse_non_optional_type(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
type_ast_t *type = NULL;
bool success = (false || (type = parse_pointer_type(ctx, pos)) || (type = parse_list_type(ctx, pos))
|| (type = parse_table_type(ctx, pos)) || (type = parse_enum_type(ctx, pos))
|| (type = parse_type_name(ctx, pos)) || (type = parse_func_type(ctx, pos)));
if (!success && match(&pos, "(")) {
whitespace(ctx, &pos);
type = optional(ctx, &pos, parse_type);
if (!type) return NULL;
whitespace(ctx, &pos);
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this type");
type->start = start;
type->end = pos;
}
return type;
}
type_ast_t *parse_type(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
type_ast_t *type = parse_non_optional_type(ctx, pos);
if (!type) return NULL;
pos = type->end;
spaces(&pos);
while (match(&pos, "?"))
type = NewTypeAST(ctx->file, start, pos, OptionalTypeAST, .type = type);
return type;
}
type_ast_t *parse_type_str(const char *str) {
file_t *file = spoof_file("<type>", str);
parse_ctx_t ctx = {
.file = file,
.on_err = NULL,
};
const char *pos = file->text;
whitespace(&ctx, &pos);
type_ast_t *ast = parse_type(&ctx, pos);
if (!ast) return ast;
pos = ast->end;
whitespace(&ctx, &pos);
if (strlen(pos) > 0) {
parser_err(&ctx, pos, pos + strlen(pos), "I couldn't parse this part of the type");
}
return ast;
}
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