Question

我正在使用Participle（Golang的软件包）编写用于游戏的解析器/词法分析器。它看起来像Bash命令，但更容易。（https://github.com/alecthomas/participle）

这是分词用于lex和解析输入的代码。（它们会在以后进行其他处理。）

type Parsed struct {
    Pos lexer.Position

    FirstBlock Block             ` @@ `
    Blocks     []*BlockWithDelim ` @@* `
}

type Block struct {
    Command   string     ` @Command `
    Flags     []*ArgFlag ` @@* `
    Arguments []string   ` @Argument* `
}

type BlockWithDelim struct {
    Delimiter string ` @(";" | "|" | "\n" ) `
    Block     Block  ` @@ `
}

type ArgFlag struct {
    Flag  string  ` "-" "-"? @Flag `
    Value *string ` ("=" @Argument)? `
}

var omegaLexer = lexer.Must(ebnf.New(strings.ReplaceAll(`
    Command = alpha {alpha} .
    Flag = Ident .
    Argument = Ident | String | RawString .
    String = "\"" { "\u0000"…"\uffff"-"\""-"\\" | "\\" "\u0000"…"\uffff" } "\"" .
    RawString = "§" { "\u0000"…"\uffff" - "§" } "§" . 
    Ident = (alpha | "_" ) { alpha | digit | "_" } .

    Comment = "#" { "\u0000"…"\uffff" - "\n" } .
    Whitespace = " " | "\t" | "\r" .

    alpha = "a"…"z" | "A"…"Z" .
    digit = "0"…"9" .
`, "§", "`"))) //replace § with ` to make reading easier, due to no escapes allowed in raw strings

var omegaParser = participle.MustBuild(&Parsed{},
    participle.Lexer(omegaLexer),
    participle.Unquote("String", "RawString"),
    participle.Elide("Whitespace", "Comment"))

问题是，它拒绝检测带有命令参数（带引号的字符串）的命令以外的任何命令。

# This works
echo "quoted string"

# This doesn't
echo hello
# Returns this error: 
# <source>:1:6: unexpected token "hello"

此外，它无法识别直接放在struct标记中的字符串。例如：

help -bool
# <source>:1:6: no match found for -

execute once; then -do="thingy"
# <source>:1:13: no match found for ;

我不知道为什么我的代码无法正常工作。我试图尽可能地复制TOML示例。

以下是代码（带有导入和打包的内容）：https://pastebin.com/QDLiGmnu

为什么我的分词语法分析器没有检测到任何东西？

0 个答案: