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59126c5b32
Add NewLazyLexer and MustNewLazyLexer which accept a function that returns the rules for the lexer. This allows us to defer the rules definitions until they're needed. Lexers in a, g, s, and x packages have been updated to use the new lazy lexer.
56 lines
1.2 KiB
Go
56 lines
1.2 KiB
Go
package e
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import (
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. "github.com/alecthomas/chroma" // nolint
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"github.com/alecthomas/chroma/lexers/internal"
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)
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// Ebnf lexer.
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var Ebnf = internal.Register(MustNewLazyLexer(
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&Config{
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Name: "EBNF",
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Aliases: []string{"ebnf"},
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Filenames: []string{"*.ebnf"},
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MimeTypes: []string{"text/x-ebnf"},
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},
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ebnfRules,
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))
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func ebnfRules() Rules {
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return Rules{
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"root": {
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Include("whitespace"),
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Include("comment_start"),
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Include("identifier"),
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{`=`, Operator, Push("production")},
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},
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"production": {
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Include("whitespace"),
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Include("comment_start"),
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Include("identifier"),
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{`"[^"]*"`, LiteralStringDouble, nil},
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{`'[^']*'`, LiteralStringSingle, nil},
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{`(\?[^?]*\?)`, NameEntity, nil},
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{`[\[\]{}(),|]`, Punctuation, nil},
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{`-`, Operator, nil},
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{`;`, Punctuation, Pop(1)},
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{`\.`, Punctuation, Pop(1)},
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},
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"whitespace": {
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{`\s+`, Text, nil},
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},
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"comment_start": {
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{`\(\*`, CommentMultiline, Push("comment")},
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},
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"comment": {
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{`[^*)]`, CommentMultiline, nil},
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Include("comment_start"),
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{`\*\)`, CommentMultiline, Pop(1)},
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{`[*)]`, CommentMultiline, nil},
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},
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"identifier": {
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{`([a-zA-Z][\w \-]*)`, Keyword, nil},
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},
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}
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}
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