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Participle expresses unexpected mark

php小编小新在这里为大家介绍一种非常有趣的技术——Participle expresses unexpected mark。分词是自然语言处理中的一个重要任务,它将一段文本按照一定的规则进行切分,得到一系列的词语。而在分词过程中,我们有时会遇到一些特殊的情况,比如在某些词语中出现了意外的标记,这可能会对后续的处理造成困扰。因此,研究如何表示和处理这种意外的标记就变得非常重要。在本文中,我们将介绍一些常见的意外标记,并给出相应的解决方案,希望能对大家有所帮助。

问题内容

我正在玩一个分词来学习如何解析,但我无法确定为什么这是意外的。

// nolint: golint, dupl
package main

import (
    "fmt"
    "io"

    "github.com/alecthomas/participle/v2"
    "github.com/alecthomas/participle/v2/lexer"
)

var htaccesslexer = lexer.mustsimple([]lexer.simplerule{
    {"comment", `^#[^\n]*`},
    {"ident", `^\w+`},
    {"int", `\d+`},
    {"string", `("(\\"|[^"])*"|\s+)`},
    {"eol", `[\n\r]+`},
    {"whitespace", `[ \t]+`},
})

type htaccess struct {
    directives []*directive `@@*`
}

type directive struct {
    pos lexer.position

    errordocument *errordocument `@@`
}

type errordocument struct {
    code int    `"errordocument" @int`
    path string `@string`
}

var htaccessparser = participle.mustbuild[htaccess](
    participle.lexer(htaccesslexer),
    participle.caseinsensitive("ident"),
    participle.unquote("string"),
    participle.elide("whitespace"),
)

func parse(r io.reader) (*htaccess, error) {
    program, err := htaccessparser.parse("", r)
    if err != nil {
        return nil, err
    }

    return program, nil
}

func main() {
    v, err := htaccessparser.parsestring("", `errordocument 403 test`)

    if err != nil {
        panic(err)
    }

    fmt.println(v)
}

据我所知,这似乎是正确的,我期望 403 在那里,但我不确定为什么它不识别它。

编辑: 我将词法分析器更改为:

var htaccessLexer = lexer.MustSimple([]lexer.SimpleRule{
    {"dir", `^\w+`},
    {"int", `\d+`},
    {"str", `("(\\"|[^"])*"|\S+)`},
    {"EOL", `[\n\r]+`},
    {"whitespace", `\s+`},
})

错误消失了,但它仍然打印一个空数组,不知道为什么。我也不确定为什么对词法分析器使用不同的值可以修复它。

解决方法

我相信我发现了问题,这是顺序,ident 通过 \w 标签在我的词法分析器中查找数字,因此这导致我的整数被标记为 ident。

我发现我必须将 quotedstrings 和 unquotedstrings 分开,否则未加引号的字符串会获取整数。或者,我可以确保它只获取非数字值,但这会错过 stringwithnum2 之类的东西

这是我的解决方案

var htaccesslexer = lexer.mustsimple([]lexer.simplerule{
    {"comment", `(?i)#[^\n]*`},
    {"quotedstring", `"(\\"|[^"])*"`},
    {"number", `[-+]?(\d*\.)?\d+`},
    {"unquotedstring", `[^ \t]+`},
    {"ident", `^[a-za-z_]`},
    {"eol", `[\n\r]+`},
    {"whitespace", `[ \t]+`},
})
type ErrorDocument struct {
    Pos lexer.Position

    Code int    `"ErrorDocument" @Number`
    Path string `(@QuotedString | @UnQuotedString)`
}

这解决了我的问题,因为它现在查找带引号的字符串,然后查找数字,然后查找不带引号的字符串。

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