tdparsekit/TDReader.j at master · boucher/tdparsekit · GitHub

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@import <Foundation/Foundation.j>

@implementation TDReader : CPObject
{
    CPString string;
    unsigned cursor;
    unsigned length;
}

- (id)init
{
    return [self initWithString:nil];
}

- (id)initWithString:(CPString)s
{
    if (self = [super init]) {
        [self setString:s];
    }

    return self;
}

- (CPString)string
{
    return string;
}

- (void)setString:(CPString)s
{
    if (string !== s) {
        string = s;
        length = string ? string.length : 0;
    }

    // reset cursor
    cursor = 0;
}

- (unsigned)read
{
    if (0 === length || cursor > length - 1) {
        return -1;
    }

    return string.charAt(cursor++);
}

- (void)unread
{
    cursor = (0 === cursor) ? 0 : cursor - 1;
}

@end