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

package lexers

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

// Makefile lexer.
var Makefile = Register(MustNewLexer(
        &Config{
                Name:      "Base Makefile",
                Aliases:   []string{"make", "makefile", "mf", "bsdmake"},
                Filenames: []string{"*.mak", "*.mk", "Makefile", "makefile", "Makefile.*", "GNUmakefile", "BSDmakefile"},
                MimeTypes: []string{"text/x-makefile"},
                EnsureNL:  true,
        },
        makefileRules,
))

func makefileRules() Rules {
        return Rules{
                "root": {
                        {`^(?:[\t ]+.*\n|\n)+`, Using("Bash"), nil},
                        {`\$[<@$+%?|*]`, Keyword, nil},
                        {`\s+`, Text, nil},
                        {`#.*?\n`, Comment, nil},
                        {`(export)(\s+)(?=[\w${}\t -]+\n)`, ByGroups(Keyword, Text), Push("export")},
                        {`export\s+`, Keyword, nil},
                        {`([\w${}().-]+)(\s*)([!?:+]?=)([ \t]*)((?:.*\\\n)+|.*\n)`, ByGroups(NameVariable, Text, Operator, Text, Using("Bash")), nil},
                        {`(?s)"(\\\\|\\.|[^"\\])*"`, LiteralStringDouble, nil},
                        {`(?s)'(\\\\|\\.|[^'\\])*'`, LiteralStringSingle, nil},
                        {`([^\n:]+)(:+)([ \t]*)`, ByGroups(NameFunction, Operator, Text), Push("block-header")},
                        {`\$\(`, Keyword, Push("expansion")},
                },
                "expansion": {
                        {`[^$a-zA-Z_()]+`, Text, nil},
                        {`[a-zA-Z_]+`, NameVariable, nil},
                        {`\$`, Keyword, nil},
                        {`\(`, Keyword, Push()},
                        {`\)`, Keyword, Pop(1)},
                },
                "export": {
                        {`[\w${}-]+`, NameVariable, nil},
                        {`\n`, Text, Pop(1)},
                        {`\s+`, Text, nil},
                },
                "block-header": {
                        {`[,|]`, Punctuation, nil},
                        {`#.*?\n`, Comment, Pop(1)},
                        {`\\\n`, Text, nil},
                        {`\$\(`, Keyword, Push("expansion")},
                        {`[a-zA-Z_]+`, Name, nil},
                        {`\n`, Text, Pop(1)},
                        {`.`, Text, nil},
                },
        }
}