138 lines
3.2 KiB
Objective-C
138 lines
3.2 KiB
Objective-C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RCTParserUtils.h"
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#import "RCTLog.h"
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@implementation RCTParserUtils
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BOOL RCTReadChar(const char **input, char c)
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{
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if (**input == c) {
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(*input)++;
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return YES;
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}
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return NO;
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}
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BOOL RCTReadString(const char **input, const char *string)
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{
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int i;
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for (i = 0; string[i] != 0; i++) {
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if (string[i] != (*input)[i]) {
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return NO;
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}
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}
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*input += i;
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return YES;
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}
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void RCTSkipWhitespace(const char **input)
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{
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while (isspace(**input)) {
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(*input)++;
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}
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}
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static BOOL RCTIsIdentifierHead(const char c)
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{
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return isalpha(c) || c == '_';
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}
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static BOOL RCTIsIdentifierTail(const char c)
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{
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return isalnum(c) || c == '_';
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}
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BOOL RCTParseArgumentIdentifier(const char **input, NSString **string)
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{
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const char *start = *input;
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do {
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if (!RCTIsIdentifierHead(**input)) {
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return NO;
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}
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(*input)++;
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while (RCTIsIdentifierTail(**input)) {
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(*input)++;
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}
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// allow namespace resolution operator
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} while (RCTReadString(input, "::"));
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if (string) {
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*string = [[NSString alloc] initWithBytes:start length:(NSInteger)(*input - start) encoding:NSASCIIStringEncoding];
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}
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return YES;
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}
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BOOL RCTParseSelectorIdentifier(const char **input, NSString **string)
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{
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const char *start = *input;
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if (!RCTIsIdentifierHead(**input)) {
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return NO;
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}
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(*input)++;
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while (RCTIsIdentifierTail(**input)) {
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(*input)++;
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}
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if (string) {
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*string = [[NSString alloc] initWithBytes:start length:(NSInteger)(*input - start) encoding:NSASCIIStringEncoding];
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}
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return YES;
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}
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static BOOL RCTIsCollectionType(NSString *type)
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{
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static NSSet *collectionTypes;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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collectionTypes = [[NSSet alloc] initWithObjects:@"NSArray", @"NSSet", @"NSDictionary", nil];
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});
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return [collectionTypes containsObject:type];
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}
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NSString *RCTParseType(const char **input)
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{
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NSString *type;
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RCTParseArgumentIdentifier(input, &type);
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RCTSkipWhitespace(input);
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if (RCTReadChar(input, '<')) {
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RCTSkipWhitespace(input);
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NSString *subtype = RCTParseType(input);
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if (RCTIsCollectionType(type)) {
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if ([type isEqualToString:@"NSDictionary"]) {
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// Dictionaries have both a key *and* value type, but the key type has
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// to be a string for JSON, so we only care about the value type
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if (RCT_DEBUG && ![subtype isEqualToString:@"NSString"]) {
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RCTLogError(@"%@ is not a valid key type for a JSON dictionary", subtype);
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}
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RCTSkipWhitespace(input);
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RCTReadChar(input, ',');
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RCTSkipWhitespace(input);
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subtype = RCTParseType(input);
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}
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if (![subtype isEqualToString:@"id"]) {
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type = [type stringByReplacingCharactersInRange:(NSRange){0, 2 /* "NS" */} withString:subtype];
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}
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} else {
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// It's a protocol rather than a generic collection - ignore it
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}
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RCTSkipWhitespace(input);
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RCTReadChar(input, '>');
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}
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RCTSkipWhitespace(input);
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if (!RCTReadChar(input, '*')) {
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RCTReadChar(input, '&');
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}
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return type;
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}
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@end
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