OC3_歌词解析

//

//  LrcManager.h

//  OC3_歌词解析

//

//  Created by zhangxueming on 15/6/15.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import <Foundation/Foundation.h>

#import "LrcItem.h"



#define FilePath @"/Users/zhangxueming/Desktop/ios1509/Day16_类的复合设计/OC3_歌词解析/传奇.txt"



@interface LrcManager : NSObject



- (id)initWithFile:(NSString *)path;



+ (NSString *)userInterface:(float)aTime;



@end

//

//  LrcManager.m

//  OC3_歌词解析

//

//  Created by zhangxueming on 15/6/15.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import "LrcManager.h"



//匿名类别(类扩展)

//能扩展方法与实例变量,实现了实例变量与方法的私有化

@interface LrcManager ()

{

    NSString *_title; // 歌曲名

    NSString *_author;// 歌词作者

    NSMutableArray *_lrcList;//存lrcItem

}



//解析歌词文件

- (BOOL)parseLrcFile:(NSString *)path;

//解析歌词标题

- (void)parseLrcTitle:(NSString *)lrcString;

//解析歌词演唱者

- (void)parseLrcAuthor:(NSString *)lrcString;

//解析歌词词条

- (void)parseLrcItem:(NSString *)lrcString;

//将时间字符串转换成浮点时间

- (float)timeByTimeString:(NSString *)aString;



@end





@implementation LrcManager



- (id)initWithFile:(NSString *)path

{

    self = [super init];

    if (self) {

        _lrcList = [NSMutableArray array];

        [self parseLrcFile:path];

    }

    return self;

}





- (BOOL)parseLrcFile:(NSString *)path

{

    //读取歌词文件

    NSString *fileContent = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

    if (!fileContent) {

        return NO;

    }

    //分割歌词字符串

    NSArray *lrcArray = [fileContent componentsSeparatedByString:@"\n"];

    

    for (NSString *lrcString in lrcArray) {

        if ([lrcString isEqualToString:@""]) {

            continue;

        }

        else if ([lrcString hasPrefix:@"[ti:"]) {

            [self parseLrcTitle:lrcString];

        }

        else if ([lrcString hasPrefix:@"[ar:"])

        {

            [self parseLrcAuthor:lrcString];

        }

        else

        {

            [self parseLrcItem:lrcString];

        }

    }

    //对可变数组排序

    [_lrcList sortUsingSelector:@selector(isSortByTime:)];

    return YES;

}



- (void)parseLrcTitle:(NSString *)lrcString

{

    _title = [lrcString substringWithRange:NSMakeRange(4, [lrcString length]-5)];

}



- (void)parseLrcAuthor:(NSString *)lrcString

{

    _author = [lrcString substringWithRange:NSMakeRange(4, [lrcString length]-5)];

}

//02:39.90

- (float)timeByTimeString:(NSString *)aString

{

    NSArray *timeArray = [aString componentsSeparatedByString:@":"];

    return [[timeArray objectAtIndex:0] intValue]*60+[[timeArray objectAtIndex:1] floatValue];

}



- (void)parseLrcItem:(NSString *)lrcString

{

    NSArray *itemArray = [lrcString componentsSeparatedByString:@"]"];

    NSInteger len = [itemArray count];

    for (NSInteger i=0; i<len-1; i++)

    {

        LrcItem  *item = [[LrcItem alloc] init];

        NSString *timeString = [[itemArray objectAtIndex:i] substringFromIndex:1];

        [item setTime:[self timeByTimeString:timeString]];

        [item setLrc:[itemArray lastObject]];

        [_lrcList addObject:item];

    }

}

//3.5 5.5 8.5  10.5   12.0

+ (NSString *)userInterface:(float)aTime

{

    LrcManager *manager = [[LrcManager alloc] initWithFile:FilePath];

    for (LrcItem *item in manager->_lrcList) {

        [item printLrcItem];

    }

    NSInteger len = [manager->_lrcList count];

    NSInteger i;

    for (i=1; i<len; i++) {

        LrcItem *item = [manager->_lrcList objectAtIndex:i];

        if (aTime < [item time]) {

            return [[manager->_lrcList objectAtIndex:i-1] lrc];

        }

    }

    if (i==len) {

        return [[manager->_lrcList objectAtIndex:i-1] lrc];

    }

    return nil;

}

@end

//

//  LrcItem.h

//  OC3_歌词解析

//

//  Created by zhangxueming on 15/6/15.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import <Foundation/Foundation.h>



@interface LrcItem : NSObject

{

    float    _time;

    NSString *_lrc;

}



- (float)time;

- (NSString *)lrc;



- (void)setTime:(float)aTime;

- (void)setLrc:(NSString *)aLrc;



- (BOOL)isSortByTime:(LrcItem *)aItem;



- (void)printLrcItem;



@end

//

//  LrcItem.m

//  OC3_歌词解析

//

//  Created by zhangxueming on 15/6/15.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import "LrcItem.h"



@implementation LrcItem



- (float)time

{

    return _time;

}



- (NSString *)lrc

{

    return _lrc;

}



- (void)setTime:(float)aTime

{

    _time = aTime;

}



- (void)setLrc:(NSString *)aLrc

{

    _lrc = aLrc;

}



- (BOOL)isSortByTime:(LrcItem *)aItem

{

    if ([self time] > [aItem time]) {

        return YES;

    }

    return NO;

}



- (void)printLrcItem

{

    NSLog(@"time = %.2f lrc = %@", [self time], [self lrc]);

}



@end

//

//  main.m

//  OC3_歌词解析

//

//  Created by zhangxueming on 15/6/15.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import <Foundation/Foundation.h>

#import "LrcManager.h"



int main(int argc, const char * argv[]) {

    @autoreleasepool {

        float time;

        scanf("%f",&time);

        NSLog(@"%@", [LrcManager userInterface:time]);

    }

    return 0;

}