83 lines
3.3 KiB
Objective-C
83 lines
3.3 KiB
Objective-C
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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#import "NumberUtil.h"
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#import "StringUtil.h"
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@implementation NSString (Util)
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- (NSData *)encodedAsUtf8 {
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NSData *result = [self dataUsingEncoding:NSUTF8StringEncoding];
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checkOperationDescribe(result != nil, @"Not a UTF8 string.");
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return result;
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}
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- (NSData *)encodedAsAscii {
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NSData *result = [self dataUsingEncoding:NSASCIIStringEncoding];
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checkOperationDescribe(result != nil, @"Not an ascii string.");
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return result;
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}
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- (NSRegularExpression *)toRegularExpression {
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NSError *regexInitError = NULL;
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NSRegularExpression *regex =
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[NSRegularExpression regularExpressionWithPattern:self options:0 error:®exInitError];
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checkOperation(regex != nil && regexInitError == NULL);
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return regex;
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}
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- (NSString *)withMatchesAgainst:(NSRegularExpression *)regex replacedBy:(NSString *)replacement {
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ows_require(regex != nil);
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ows_require(replacement != nil);
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NSMutableString *m = self.mutableCopy;
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[regex replaceMatchesInString:m options:0 range:NSMakeRange(0, m.length) withTemplate:replacement];
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return m;
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}
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- (bool)containsAnyMatches:(NSRegularExpression *)regex {
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ows_require(regex != nil);
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return [regex numberOfMatchesInString:self options:0 range:NSMakeRange(0, self.length)] > 0;
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}
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- (NSString *)withPrefixRemovedElseNull:(NSString *)prefix {
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ows_require(prefix != nil);
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if (prefix.length > 0 && ![self hasPrefix:prefix])
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return nil;
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return [self substringFromIndex:prefix.length];
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}
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- (NSDictionary *)decodedAsJsonIntoDictionary {
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NSError *jsonParseError = nil;
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id parsedJson = [NSJSONSerialization JSONObjectWithData:self.encodedAsUtf8 options:0 error:&jsonParseError];
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checkOperationDescribe(jsonParseError == nil,
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([NSString stringWithFormat:@"Json parse error: %@, on json: %@", jsonParseError, self]));
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checkOperationDescribe([parsedJson isKindOfClass:NSDictionary.class], @"Unexpected json data");
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return parsedJson;
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}
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- (NSNumber *)tryParseAsDecimalNumber {
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NSNumberFormatter *formatter = [NSNumberFormatter new];
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[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
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// NSNumberFormatter.numberFromString is good at noticing bad inputs, but loses precision for large values
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// NSDecimalNumber.decimalNumberWithString has perfect precision, but lets bad inputs through sometimes (e.g.
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// "88ffhih" -> 88)
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// We use both to get both accuracy and detection of bad inputs
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if ([formatter numberFromString:self] == nil) {
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return nil;
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}
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return [NSDecimalNumber decimalNumberWithString:self];
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}
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- (NSNumber *)tryParseAsUnsignedInteger {
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NSNumber *value = [self tryParseAsDecimalNumber];
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return value.hasUnsignedIntegerValue ? value : nil;
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}
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- (NSString *)removeAllCharactersIn:(NSCharacterSet *)characterSet {
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ows_require(characterSet != nil);
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return [[self componentsSeparatedByCharactersInSet:characterSet] componentsJoinedByString:@""];
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}
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- (NSString *)digitsOnly {
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return [self removeAllCharactersIn:[NSCharacterSet.decimalDigitCharacterSet invertedSet]];
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}
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- (NSString *)withCharactersInRange:(NSRange)range replacedBy:(NSString *)substring {
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NSMutableString *result = self.mutableCopy;
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[result replaceCharactersInRange:range withString:substring];
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return result;
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}
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@end
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