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122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
package n
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import (
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"strings"
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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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// nixb matches right boundary of a nix word. Use it instead of \b.
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const nixb = `(?![a-zA-Z0-9_'-])`
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// Nix lexer.
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var Nix = internal.Register(MustNewLexer(
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&Config{
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Name: "Nix",
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Aliases: []string{"nixos", "nix"},
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Filenames: []string{"*.nix"},
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MimeTypes: []string{"text/x-nix"},
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},
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Rules{
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"root": {
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Include("keywords"),
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Include("builtins"),
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// "./path" and ".float" literals have to be above "." operator
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Include("literals"),
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Include("operators"),
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{`#.*$`, CommentSingle, nil},
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{`/\*`, CommentMultiline, Push("comment")},
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{`\(`, Punctuation, Push("paren")},
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{`\[`, Punctuation, Push("list")},
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{`"`, StringDouble, Push("qstring")},
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{`''`, StringSingle, Push("istring")},
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{`{`, Punctuation, Push("scope")},
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{`let` + nixb, Keyword, Push("scope")},
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Include("id"),
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Include("space"),
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},
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"keywords": {
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{`import` + nixb, KeywordNamespace, nil},
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{Words(``, nixb, strings.Fields("rec inherit with if then else assert")...), Keyword, nil},
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},
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"builtins": {
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{`throw` + nixb, NameException, nil},
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{Words(``, nixb, strings.Fields("abort baseNameOf builtins currentTime dependencyClosure derivation dirOf fetchTarball filterSource getAttr getEnv hasAttr isNull map removeAttrs toString toXML")...), NameBuiltin, nil},
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},
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"literals": {
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{Words(``, nixb, strings.Fields("true false null")...), NameConstant, nil},
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Include("uri"),
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Include("path"),
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Include("int"),
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Include("float"),
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},
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"operators": {
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{` [/-] `, Operator, nil},
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{`(\.)(\${)`, ByGroups(Operator, StringInterpol), Push("interpol")},
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{`(\?)(\s*)(\${)`, ByGroups(Operator, Text, StringInterpol), Push("interpol")},
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{Words(``, ``, strings.Fields("@ . ? ++ + != ! // == && || -> <= < >= > *")...), Operator, nil},
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{`[;:]`, Punctuation, nil},
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},
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"comment": {
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{`\*/`, CommentMultiline, Pop(1)},
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{`.|\n`, CommentMultiline, nil},
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},
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"paren": {
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{`\)`, Punctuation, Pop(1)},
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Include("root"),
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},
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"list": {
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{`\]`, Punctuation, Pop(1)},
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Include("root"),
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},
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"qstring": {
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{`"`, StringDouble, Pop(1)},
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{`\${`, StringInterpol, Push("interpol")},
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{`\\.`, StringEscape, nil},
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{`.|\n`, StringDouble, nil},
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},
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"istring": {
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{`''\$`, StringEscape, nil}, // "$"
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{`'''`, StringEscape, nil}, // "''"
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{`''\\.`, StringEscape, nil}, // "\."
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{`''`, StringSingle, Pop(1)},
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{`\${`, StringInterpol, Push("interpol")},
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// The next rule is important: "$" escapes any symbol except "{"!
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{`\$.`, StringSingle, nil}, // "$."
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{`.|\n`, StringSingle, nil},
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},
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"scope": {
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{`}:`, Punctuation, Pop(1)},
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{`}`, Punctuation, Pop(1)},
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{`in` + nixb, Keyword, Pop(1)},
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{`\${`, StringInterpol, Push("interpol")},
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Include("root"), // "==" has to be above "="
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{Words(``, ``, strings.Fields("= ? ,")...), Operator, nil},
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},
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"interpol": {
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{`}`, StringInterpol, Pop(1)},
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Include("root"),
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},
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"id": {
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{`[a-zA-Z_][a-zA-Z0-9_'-]*`, Name, nil},
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},
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"uri": {
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{`[a-zA-Z][a-zA-Z0-9+.-]*:[a-zA-Z0-9%/?:@&=+$,_.!~*'-]+`, StringDoc, nil},
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},
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"path": {
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{`[a-zA-Z0-9._+-]*(/[a-zA-Z0-9._+-]+)+`, StringRegex, nil},
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{`~(/[a-zA-Z0-9._+-]+)+/?`, StringRegex, nil},
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{`<[a-zA-Z0-9._+-]+(/[a-zA-Z0-9._+-]+)*>`, StringRegex, nil},
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},
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"int": {
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{`-?[0-9]+` + nixb, NumberInteger, nil},
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},
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"float": {
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{`-?(([1-9][0-9]*\.[0-9]*)|(0?\.[0-9]+))([Ee][+-]?[0-9]+)?` + nixb, NumberFloat, nil},
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},
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"space": {
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{`[ \t\r\n]+`, Text, nil},
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},
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},
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))
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