RCTParserUtils.m
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTParserUtils.h"
#import "RCTLog.h"
@implementation RCTParserUtils
BOOL RCTReadChar(const char **input, char c)
{
if (**input == c) {
(*input)++;
return YES;
}
return NO;
}
BOOL RCTReadString(const char **input, const char *string)
{
int i;
for (i = 0; string[i] != 0; i++) {
if (string[i] != (*input)[i]) {
return NO;
}
}
*input += i;
return YES;
}
void RCTSkipWhitespace(const char **input)
{
while (isspace(**input)) {
(*input)++;
}
}
static BOOL RCTIsIdentifierHead(const char c)
{
return isalpha(c) || c == '_';
}
static BOOL RCTIsIdentifierTail(const char c)
{
return isalnum(c) || c == '_';
}
BOOL RCTParseArgumentIdentifier(const char **input, NSString **string)
{
const char *start = *input;
do {
if (!RCTIsIdentifierHead(**input)) {
return NO;
}
(*input)++;
while (RCTIsIdentifierTail(**input)) {
(*input)++;
}
// allow namespace resolution operator
} while (RCTReadString(input, "::"));
if (string) {
*string = [[NSString alloc] initWithBytes:start
length:(NSInteger)(*input - start)
encoding:NSASCIIStringEncoding];
}
return YES;
}
BOOL RCTParseSelectorIdentifier(const char **input, NSString **string)
{
const char *start = *input;
if (!RCTIsIdentifierHead(**input)) {
return NO;
}
(*input)++;
while (RCTIsIdentifierTail(**input)) {
(*input)++;
}
if (string) {
*string = [[NSString alloc] initWithBytes:start
length:(NSInteger)(*input - start)
encoding:NSASCIIStringEncoding];
}
return YES;
}
static BOOL RCTIsCollectionType(NSString *type)
{
static NSSet *collectionTypes;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
collectionTypes = [[NSSet alloc] initWithObjects:
@"NSArray", @"NSSet", @"NSDictionary", nil];
});
return [collectionTypes containsObject:type];
}
NSString *RCTParseType(const char **input)
{
NSString *type;
RCTParseArgumentIdentifier(input, &type);
RCTSkipWhitespace(input);
if (RCTReadChar(input, '<')) {
RCTSkipWhitespace(input);
NSString *subtype = RCTParseType(input);
if (RCTIsCollectionType(type)) {
if ([type isEqualToString:@"NSDictionary"]) {
// Dictionaries have both a key *and* value type, but the key type has
// to be a string for JSON, so we only care about the value type
if (RCT_DEBUG && ![subtype isEqualToString:@"NSString"]) {
RCTLogError(@"%@ is not a valid key type for a JSON dictionary", subtype);
}
RCTSkipWhitespace(input);
RCTReadChar(input, ',');
RCTSkipWhitespace(input);
subtype = RCTParseType(input);
}
if (![subtype isEqualToString:@"id"]) {
type = [type stringByReplacingCharactersInRange:(NSRange){0, 2 /* "NS" */}
withString:subtype];
}
} else {
// It's a protocol rather than a generic collection - ignore it
}
RCTSkipWhitespace(input);
RCTReadChar(input, '>');
}
RCTSkipWhitespace(input);
if (!RCTReadChar(input, '*')) {
RCTReadChar(input, '&');
}
return type;
}
@end