Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tag: 0.6.1
Fetching contributors…

Cannot retrieve contributors at this time

152 lines (123 sloc) 3.683 kb
// Copyright 2010 Todd Ditchendorf
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#import <ParseKit/PKNumberState.h>
#import <ParseKit/PKReader.h>
#import <ParseKit/PKToken.h>
#import <ParseKit/PKTokenizer.h>
#import <ParseKit/PKSymbolState.h>
#import <ParseKit/PKTypes.h>
@interface PKToken ()
@property (nonatomic, readwrite) NSUInteger offset;
@end
@interface PKTokenizerState ()
- (void)resetWithReader:(PKReader *)r;
- (void)append:(PKUniChar)c;
- (NSString *)bufferedString;
@end
@interface PKNumberState ()
- (CGFloat)absorbDigitsFromReader:(PKReader *)r isFraction:(BOOL)fraction;
- (CGFloat)value;
- (void)parseLeftSideFromReader:(PKReader *)r;
- (void)parseRightSideFromReader:(PKReader *)r;
- (void)reset:(PKUniChar)cin;
@end
@implementation PKNumberState
- (PKToken *)nextTokenFromReader:(PKReader *)r startingWith:(PKUniChar)cin tokenizer:(PKTokenizer *)t {
NSParameterAssert(r);
NSParameterAssert(t);
[self resetWithReader:r];
negative = NO;
PKUniChar originalCin = cin;
if ('-' == cin) {
negative = YES;
cin = [r read];
[self append:'-'];
} else if ('+' == cin) {
cin = [r read];
[self append:'+'];
}
[self reset:cin];
if ('.' == c) {
[self parseRightSideFromReader:r];
} else {
[self parseLeftSideFromReader:r];
[self parseRightSideFromReader:r];
}
// erroneous ., +, or -
if (!gotADigit) {
if (negative && PKEOF != c) { // ??
[r unread];
}
return [t.symbolState nextTokenFromReader:r startingWith:originalCin tokenizer:t];
}
if (PKEOF != c) {
[r unread];
}
if (negative) {
floatValue = -floatValue;
}
PKToken *tok = [PKToken tokenWithTokenType:PKTokenTypeNumber stringValue:[self bufferedString] floatValue:[self value]];
tok.offset = offset;
return tok;
}
- (CGFloat)value {
return floatValue;
}
- (CGFloat)absorbDigitsFromReader:(PKReader *)r isFraction:(BOOL)isFraction {
CGFloat divideBy = 1.0;
CGFloat v = 0.0;
while (1) {
if (isdigit(c)) {
[self append:c];
gotADigit = YES;
v = v * 10.0 + (c - '0');
c = [r read];
if (isFraction) {
divideBy *= 10.0;
}
} else {
break;
}
}
if (isFraction) {
v = v / divideBy;
}
return (CGFloat)v;
}
- (void)parseLeftSideFromReader:(PKReader *)r {
floatValue = [self absorbDigitsFromReader:r isFraction:NO];
}
- (void)parseRightSideFromReader:(PKReader *)r {
if ('.' == c) {
PKUniChar n = [r read];
BOOL nextIsDigit = isdigit(n);
if (PKEOF != n) {
[r unread];
}
if (nextIsDigit || allowsTrailingDot) {
[self append:'.'];
if (nextIsDigit) {
c = [r read];
floatValue += [self absorbDigitsFromReader:r isFraction:YES];
}
}
}
}
- (void)reset:(PKUniChar)cin {
gotADigit = NO;
floatValue = 0.0;
c = cin;
}
@synthesize allowsTrailingDot;
@end
Jump to Line
Something went wrong with that request. Please try again.