source: code/trunk/vendor/github.com/alecthomas/chroma/v2/lexers/go.go@ 67

package lexers

import (
        "strings"

        . "github.com/alecthomas/chroma/v2" // nolint
)

// Go lexer.
var Go = Register(MustNewLexer(
        &Config{
                Name:      "Go",
                Aliases:   []string{"go", "golang"},
                Filenames: []string{"*.go"},
                MimeTypes: []string{"text/x-gosrc"},
                EnsureNL:  true,
        },
        goRules,
).SetAnalyser(func(text string) float32 {
        if strings.Contains(text, "fmt.") && strings.Contains(text, "package ") {
                return 0.5
        }
        if strings.Contains(text, "package ") {
                return 0.1
        }
        return 0.0
}))

func goRules() Rules {
        return Rules{
                "root": {
                        {`\n`, Text, nil},
                        {`\s+`, Text, nil},
                        {`\\\n`, Text, nil},
                        {`//(.*?)\n`, CommentSingle, nil},
                        {`/(\\\n)?[*](.|\n)*?[*](\\\n)?/`, CommentMultiline, nil},
                        {`(import|package)\b`, KeywordNamespace, nil},
                        {`(var|func|struct|map|chan|type|interface|const)\b`, KeywordDeclaration, nil},
                        {Words(``, `\b`, `break`, `default`, `select`, `case`, `defer`, `go`, `else`, `goto`, `switch`, `fallthrough`, `if`, `range`, `continue`, `for`, `return`), Keyword, nil},
                        {`(true|false|iota|nil)\b`, KeywordConstant, nil},
                        {Words(``, `\b(\()`, `uint`, `uint8`, `uint16`, `uint32`, `uint64`, `int`, `int8`, `int16`, `int32`, `int64`, `float`, `float32`, `float64`, `complex64`, `complex128`, `byte`, `rune`, `string`, `bool`, `error`, `uintptr`, `print`, `println`, `panic`, `recover`, `close`, `complex`, `real`, `imag`, `len`, `cap`, `append`, `copy`, `delete`, `new`, `make`), ByGroups(NameBuiltin, Punctuation), nil},
                        {Words(``, `\b`, `uint`, `uint8`, `uint16`, `uint32`, `uint64`, `int`, `int8`, `int16`, `int32`, `int64`, `float`, `float32`, `float64`, `complex64`, `complex128`, `byte`, `rune`, `string`, `bool`, `error`, `uintptr`), KeywordType, nil},
                        {`\d+i`, LiteralNumber, nil},
                        {`\d+\.\d*([Ee][-+]\d+)?i`, LiteralNumber, nil},
                        {`\.\d+([Ee][-+]\d+)?i`, LiteralNumber, nil},
                        {`\d+[Ee][-+]\d+i`, LiteralNumber, nil},
                        {`\d+(\.\d+[eE][+\-]?\d+|\.\d*|[eE][+\-]?\d+)`, LiteralNumberFloat, nil},
                        {`\.\d+([eE][+\-]?\d+)?`, LiteralNumberFloat, nil},
                        {`0[0-7]+`, LiteralNumberOct, nil},
                        {`0[xX][0-9a-fA-F_]+`, LiteralNumberHex, nil},
                        {`0b[01_]+`, LiteralNumberBin, nil},
                        {`(0|[1-9][0-9_]*)`, LiteralNumberInteger, nil},
                        {`'(\\['"\\abfnrtv]|\\x[0-9a-fA-F]{2}|\\[0-7]{1,3}|\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}|[^\\])'`, LiteralStringChar, nil},
                        {"(`)([^`]*)(`)", ByGroups(LiteralString, UsingLexer(TypeRemappingLexer(GoTextTemplate, TypeMapping{{Other, LiteralString, nil}})), LiteralString), nil},
                        {`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
                        {`(<<=|>>=|<<|>>|<=|>=|&\^=|&\^|\+=|-=|\*=|/=|%=|&=|\|=|&&|\|\||<-|\+\+|--|==|!=|:=|\.\.\.|[+\-*/%&])`, Operator, nil},
                        {`([a-zA-Z_]\w*)(\s*)(\()`, ByGroups(NameFunction, UsingSelf("root"), Punctuation), nil},
                        {`[|^<>=!()\[\]{}.,;:]`, Punctuation, nil},
                        {`[^\W\d]\w*`, NameOther, nil},
                },
        }
}

var GoHTMLTemplate = Register(DelegatingLexer(HTML, MustNewXMLLexer(
        embedded,
        "embedded/go_template.xml",
).SetConfig(
        &Config{
                Name:    "Go HTML Template",
                Aliases: []string{"go-html-template"},
        },
)))

var GoTextTemplate = Register(MustNewXMLLexer(
        embedded,
        "embedded/go_template.xml",
).SetConfig(
        &Config{
                Name:    "Go Text Template",
                Aliases: []string{"go-text-template"},
        },
))