ParseKit简单示例不起作用，parserFromGrammer在控制台中显示PEGRecognitionExceptions的大量异常

时间：2013-08-30 19:55:57

标签： ios parsekit

我刚遇到ParseKit，我使用http://parsekit.com/iphone.html的说明将我的IOS项目纳入其中。我是从Google Code获得的，签出的版本是1543。 所有编译和建造都很好。

然后我尝试使用其中一篇文章中的（最终工作）简单示例 - Can't get simple ParseKit example working 

NSString *test = @"FOO : BAR";

NSString *grammar = @"@start = foo ':' bar; foo = 'FOO'; bar = 'BAR';";

PKParser *parser = nil;
NSError *err = nil;
parser = [[PKParserFactory factory] parserFromGrammar:grammar assembler:self error:&err];
NSLog(@"parser: error1: %@", err);

[parser parse:test error:&err];
NSLog(@"parser: error2: %@", err);


- (void)didMatchFoo:(PKAssembly *)a
{
   NSLog(@"FOO");
}

- (void)didMatchBar:(PKAssembly *)a
{
   NSLog(@"BAR");
}

当执行到达行

时 
    parser = [[PKParserFactory factory] parserFromGrammar:grammar assembler:self error:&err];

我在控制台中看到很多错误消息。 didMatchFoo和didMatchBar不会触发。

以下是来自控制台的消息：

objc[53244]: EXCEPTIONS: throwing 0xb47f040 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd2e0] for exception 0xb47f020
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd2e0] for exception 0xb47f020
objc[53244]: EXCEPTIONS: handling exception 0xb47f020 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xb47f5e0 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd170] for exception 0xb47f5c0
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd170] for exception 0xb47f5c0
objc[53244]: EXCEPTIONS: handling exception 0xb47f5c0 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xa589360 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd230] for exception 0xa589340
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd230] for exception 0xa589340
objc[53244]: EXCEPTIONS: handling exception 0xa589340 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xa589470 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd290] for exception 0xa589450
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd290] for exception 0xa589450
objc[53244]: EXCEPTIONS: handling exception 0xa589450 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xa58bd80 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd380] for exception 0xa58bd60
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd380] for exception 0xa58bd60
objc[53244]: EXCEPTIONS: handling exception 0xa58bd60 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0x8b848e0 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd210] for exception 0x8b848c0
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd210] for exception 0x8b848c0
objc[53244]: EXCEPTIONS: handling exception 0x8b848c0 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0x8ba5610 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd2d0] for exception  0x8ba55f0
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd2d0] for exception 0x8ba55f0
objc[53244]: EXCEPTIONS: handling exception 0x8ba55f0 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xb57a160 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd330] for exception 0xb57a140
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd330] for exception 0xb57a140
objc[53244]: EXCEPTIONS: handling exception 0xb57a140 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xb57a730 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd2e0] for exception 0xb57a710
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd2e0] for exception 0xb57a710
objc[53244]: EXCEPTIONS: handling exception 0xb57a710 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xb57ac90 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd170] for exception 0xb57ac70
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd170] for exception 0xb57ac70
objc[53244]: EXCEPTIONS: handling exception 0xb57ac70 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0xb57af30 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd230] for exception 0xb57af10
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd230] for exception 0xb57af10
objc[53244]: EXCEPTIONS: handling exception 0xb57af10 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler 
objc[53244]: EXCEPTIONS: throwing 0x8ba5c40 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd290] for exception 0x8ba5c20
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd290] for exception 0x8ba5c20
objc[53244]: EXCEPTIONS: handling exception 0x8ba5c20 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0x8ba5f40 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd380] for exception 0x8ba5f20
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd380] for exception 0x8ba5f20
objc[53244]: EXCEPTIONS: handling exception 0x8ba5f20 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0x8e80b40 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd210] for exception 0x8e80b20
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd210] for exception 0x8e80b20
objc[53244]: EXCEPTIONS: handling exception 0x8e80b20 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0x8e4ac80 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd2d0] for exception 0x8e4ac60
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd2d0] for exception 0x8e4ac60
objc[53244]: EXCEPTIONS: handling exception 0x8e4ac60 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0x8ba6200 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd330] for exception 0x8ba61e0
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd330] for exception 0x8ba61e0
objc[53244]: EXCEPTIONS: handling exception 0x8ba61e0 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler
objc[53244]: EXCEPTIONS: throwing 0x8ba62c0 (object 0xa17b7b0, a PEGRecognitionException)
objc[53244]: EXCEPTIONS: searching through frame [ip=0xf23ac sp=0xbfffd420] for exception 0x8ba62a0
objc[53244]: EXCEPTIONS: catch(PEGRecognitionException)
objc[53244]: EXCEPTIONS: unwinding through frame [ip=0xf23ac sp=0xbfffd420] for exception 0x8ba62a0
objc[53244]: EXCEPTIONS: handling exception 0x8ba62a0 at 0xf2406
objc[53244]: EXCEPTIONS: finishing handler

[parser parse:test error:&err];

不调用回调，也不返回任何错误。

非常感谢任何指示或帮助！

PS - 我在ParseKit中取消注释了一些NSLOG语句，看看上面的例外是什么：

语法为

    NSString *grammar = @"@start = expr; expr = abc col def; abc = 'ABC'; col = ':'; def = 'DEF';";

我得到了

Expected : @
Line : 1
Near : ; expr = abc 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def 
Found : col

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def 
Found : def

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def 
Found : def

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

Expected : @
Line : 1
Near : ; expr = abc col def ; abc 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : col

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : def

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : def

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc 
Found : ;

Expected : @
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col 
Found : ;

Expected : @
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col 
Found : ;

Expected : @
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def 
Found : ;

Expected : @
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def 
Found : ;

Expected : @
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' ; 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' ; 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' ; 
Found : ;

Expected : @
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' ; 
Found : =

No viable alternative found in rule 'predicate'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' ; 
Found : ;

No viable alternative found in rule 'primaryExpr'.
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' ; 
Found : ;

Expected : |
Line : 1
Near : ; expr = abc col def ; abc = 'ABC' ; col = ':' ; def = 'DEF' ; 
Found : ;

No viable alternative found in rule 'statement'.
Line : 2147483647
Near : «EOF» 
Found : «EOF»

1 个答案:

答案 0 :(得分：0)

我让它工作......有点儿！

与文件有所不同......

我与libParseKitMobile.a链接...很明显，因为它是iOS的唯一目标。

我使用ParserGenApp首先为我的语法生成.h和.m

我在项目中包含了这些生成的文件。我的项目不是用ARC构建的，而ParseKit也是如此，所以我将-fobjc-arc添加到生成的.m的编译标志中

然后在我的代码中使用如下：

NSString *test = @"ABC : DEF";

MyParser *parser = [[MyParser alloc] init];
NSError *err = nil;
PKAssembly *result = [parser parseString:test
                               assembler:self
                                   error:&err];

if (!result) {
    if (err) NSLog(@"%@", err);
} else {
    NSLog(@"%@", [result description]);
}

回调需要采用以下形式：

- (void)parser:(PKParser *)p didMatchAbc:(PKAssembly *)a;

（ParseKit文档提到 - （void）didMatchAbc：（PKAssembly * a）;但是因为所需的签名不同而不起作用）

从Github下载并尝试完整的MiniMath项目帮助我解决了一些问题 - https://github.com/itod/ParseKitMiniMathExample

MiniMath示例也可以作为zip下载，但似乎没有嵌入的ParseKit文件，我遇到了一些问题。

希望这有助于其他人在他们的iOS项目中使用ParseKit！

Todd Ditchendorf，非常感谢你在ParseKit上的工作！不幸的是，它有点碎片--Github版本，谷歌代码版本，网站上的文档稀疏，有趣，链接到Github和谷歌代码，增加了混乱。 

parser = [[PKParserFactory factory] parserFromGrammar:grammar assembler:self error:&err];

似乎不起作用。但是，首先生成解析器代码然后使用它似乎工作。

如果可以清理ParseKit并使其更新，那将是很棒的！这是一个非常有用的工具，更是如此，因为我没有看到任何其他替代方案被提及。如果您想帮助清理ParseKit及其文档，我很乐意为您提供帮助！

干杯， 斯里达尔

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