const (
	Whitespace = TextWhitespace

	Date = LiteralDate

	String          = LiteralString
	StringAffix     = LiteralStringAffix
	StringBacktick  = LiteralStringBacktick
	StringChar      = LiteralStringChar
	StringDelimiter = LiteralStringDelimiter
	StringDoc       = LiteralStringDoc
	StringDouble    = LiteralStringDouble
	StringEscape    = LiteralStringEscape
	StringHeredoc   = LiteralStringHeredoc
	StringInterpol  = LiteralStringInterpol
	StringOther     = LiteralStringOther
	StringRegex     = LiteralStringRegex
	StringSingle    = LiteralStringSingle
	StringSymbol    = LiteralStringSymbol

	Number            = LiteralNumber
	NumberBin         = LiteralNumberBin
	NumberFloat       = LiteralNumberFloat
	NumberHex         = LiteralNumberHex
	NumberInteger     = LiteralNumberInteger
	NumberIntegerLong = LiteralNumberIntegerLong
	NumberOct         = LiteralNumberOct
)

var ANSI2RGB = map[string]string{
	"#ansiblack":     "000000",
	"#ansidarkred":   "7f0000",
	"#ansidarkgreen": "007f00",
	"#ansibrown":     "7f7fe0",
	"#ansidarkblue":  "00007f",
	"#ansipurple":    "7f007f",
	"#ansiteal":      "007f7f",
	"#ansilightgray": "e5e5e5",

	"#ansidarkgray":  "555555",
	"#ansired":       "ff0000",
	"#ansigreen":     "00ff00",
	"#ansiyellow":    "ffff00",
	"#ansiblue":      "0000ff",
	"#ansifuchsia":   "ff00ff",
	"#ansiturquoise": "00ffff",
	"#ansiwhite":     "ffffff",

	"#black":     "000000",
	"#darkred":   "7f0000",
	"#darkgreen": "007f00",
	"#brown":     "7f7fe0",
	"#darkblue":  "00007f",
	"#purple":    "7f007f",
	"#teal":      "007f7f",
	"#lightgray": "e5e5e5",

	"#darkgray":  "555555",
	"#red":       "ff0000",
	"#green":     "00ff00",
	"#yellow":    "ffff00",
	"#blue":      "0000ff",
	"#fuchsia":   "ff00ff",
	"#turquoise": "00ffff",
	"#white":     "ffffff",
}

var (
	StandardTypes = map[TokenType]string{
		Background:    "chroma",
		LineNumbers:   "ln",
		LineHighlight: "hl",

		Text:       "",
		Whitespace: "w",
		Error:      "err",
		Other:      "x",

		Keyword:            "k",
		KeywordConstant:    "kc",
		KeywordDeclaration: "kd",
		KeywordNamespace:   "kn",
		KeywordPseudo:      "kp",
		KeywordReserved:    "kr",
		KeywordType:        "kt",

		Name:                 "n",
		NameAttribute:        "na",
		NameBuiltin:          "nb",
		NameBuiltinPseudo:    "bp",
		NameClass:            "nc",
		NameConstant:         "no",
		NameDecorator:        "nd",
		NameEntity:           "ni",
		NameException:        "ne",
		NameFunction:         "nf",
		NameFunctionMagic:    "fm",
		NameProperty:         "py",
		NameLabel:            "nl",
		NameNamespace:        "nn",
		NameOther:            "nx",
		NameTag:              "nt",
		NameVariable:         "nv",
		NameVariableClass:    "vc",
		NameVariableGlobal:   "vg",
		NameVariableInstance: "vi",
		NameVariableMagic:    "vm",

		Literal:     "l",
		LiteralDate: "ld",

		String:          "s",
		StringAffix:     "sa",
		StringBacktick:  "sb",
		StringChar:      "sc",
		StringDelimiter: "dl",
		StringDoc:       "sd",
		StringDouble:    "s2",
		StringEscape:    "se",
		StringHeredoc:   "sh",
		StringInterpol:  "si",
		StringOther:     "sx",
		StringRegex:     "sr",
		StringSingle:    "s1",
		StringSymbol:    "ss",

		Number:            "m",
		NumberBin:         "mb",
		NumberFloat:       "mf",
		NumberHex:         "mh",
		NumberInteger:     "mi",
		NumberIntegerLong: "il",
		NumberOct:         "mo",

		Operator:     "o",
		OperatorWord: "ow",

		Punctuation: "p",

		Comment:            "c",
		CommentHashbang:    "ch",
		CommentMultiline:   "cm",
		CommentPreproc:     "cp",
		CommentPreprocFile: "cpf",
		CommentSingle:      "c1",
		CommentSpecial:     "cs",

		Generic:           "g",
		GenericDeleted:    "gd",
		GenericEmph:       "ge",
		GenericError:      "gr",
		GenericHeading:    "gh",
		GenericInserted:   "gi",
		GenericOutput:     "go",
		GenericPrompt:     "gp",
		GenericStrong:     "gs",
		GenericSubheading: "gu",
		GenericTraceback:  "gt",
	}
)

type Analyser interface {
	AnalyseText(text string) float32
}

type Colour int32

type Colours []Colour

type CompiledRule struct {
	Rule
	Regexp *regexp2.Regexp
	// contains filtered or unexported fields
}

type CompiledRules map[string][]*CompiledRule

type Config struct {
	// Name of the lexer.
	Name string

	// Shortcuts for the lexer
	Aliases []string

	// File name globs
	Filenames []string

	// Secondary file name globs
	AliasFilenames []string

	// MIME types
	MimeTypes []string

	// Regex matching is case-insensitive.
	CaseInsensitive bool

	// Regex matches all characters.
	DotAll bool

	// Regex does not match across lines ($ matches EOL).
	//
	// Defaults to multiline.
	NotMultiline bool
}

type Emitter interface {
	// Emit tokens for the given regex groups.
	Emit(groups []string, lexer Lexer) Iterator
}

type EmitterFunc func(groups []string, lexer Lexer) Iterator

type Formatter interface {
	// Format returns a formatting function for tokens.
	//
	// If the iterator panics, the Formatter should recover.
	Format(w io.Writer, style *Style, iterator Iterator) error
}

type FormatterFunc func(w io.Writer, style *Style, iterator Iterator) error

type Iterator func() *Token

type Lexer interface {
	// Config describing the features of the Lexer.
	Config() *Config
	// Tokenise returns an Iterator over tokens in text.
	Tokenise(options *TokeniseOptions, text string) (Iterator, error)
}

type LexerMutator interface {
	// Rules are the lexer rules, state is the state key for the rule the mutator is associated with.
	MutateLexer(rules CompiledRules, state string, rule int) error
}

type LexerState struct {
	Lexer *RegexLexer
	Text  []rune
	Pos   int
	Rules CompiledRules
	Stack []string
	State string
	Rule  int
	// Group matches.
	Groups []string
	// Custum context for mutators.
	MutatorContext map[interface{}]interface{}
	// contains filtered or unexported fields
}

type Lexers []Lexer

type Mutator interface {
	// Mutate the lexer state machine as it is processing.
	Mutate(state *LexerState) error
}

type MutatorFunc func(state *LexerState) error

type RegexLexer struct {
	// contains filtered or unexported fields
}

type Rule struct {
	Pattern string
	Type    Emitter
	Mutator Mutator
}

type Rules map[string][]Rule

type Style struct {
	Name string
	// contains filtered or unexported fields
}

type StyleBuilder struct {
	// contains filtered or unexported fields
}

type StyleEntries map[TokenType]string

type StyleEntry struct {
	// Hex colours.
	Colour     Colour
	Background Colour
	Border     Colour

	Bold      Trilean
	Italic    Trilean
	Underline Trilean
	NoInherit bool
}

type Token struct {
	Type  TokenType
	Value string
}

type TokenType int

const (
	// Default background style.
	Background TokenType = -1 - iota
	// Line numbers in output.
	LineNumbers
	// Line higlight style.
	LineHighlight
	// Input that could not be tokenised.
	Error
	// Other is used by the Delegate lexer to indicate which tokens should be handled by the delegate.
	Other
	// No highlighting.
	None
)

const (
	Keyword TokenType = 1000 + iota
	KeywordConstant
	KeywordDeclaration
	KeywordNamespace
	KeywordPseudo
	KeywordReserved
	KeywordType
)

const (
	Name TokenType = 2000 + iota
	NameAttribute
	NameBuiltin
	NameBuiltinPseudo
	NameClass
	NameConstant
	NameDecorator
	NameEntity
	NameException
	NameFunction
	NameFunctionMagic
	NameKeyword
	NameLabel
	NameNamespace
	NameOperator
	NameOther
	NamePseudo
	NameProperty
	NameTag
	NameVariable
	NameVariableAnonymous
	NameVariableClass
	NameVariableGlobal
	NameVariableInstance
	NameVariableMagic
)

const (
	Literal TokenType = 3000 + iota
	LiteralDate
	LiteralOther
)

const (
	LiteralString TokenType = 3100 + iota
	LiteralStringAffix
	LiteralStringAtom
	LiteralStringBacktick
	LiteralStringBoolean
	LiteralStringChar
	LiteralStringDelimiter
	LiteralStringDoc
	LiteralStringDouble
	LiteralStringEscape
	LiteralStringHeredoc
	LiteralStringInterpol
	LiteralStringName
	LiteralStringOther
	LiteralStringRegex
	LiteralStringSingle
	LiteralStringSymbol
)

const (
	LiteralNumber TokenType = 3200 + iota
	LiteralNumberBin
	LiteralNumberFloat
	LiteralNumberHex
	LiteralNumberInteger
	LiteralNumberIntegerLong
	LiteralNumberOct
)

const (
	Operator TokenType = 4000 + iota
	OperatorWord
)

const (
	Comment TokenType = 6000 + iota
	CommentHashbang
	CommentMultiline
	CommentSingle
	CommentSpecial
)

const (
	CommentPreproc TokenType = 6100 + iota
	CommentPreprocFile
)

const (
	Generic TokenType = 7000 + iota
	GenericDeleted
	GenericEmph
	GenericError
	GenericHeading
	GenericInserted
	GenericOutput
	GenericPrompt
	GenericStrong
	GenericSubheading
	GenericTraceback
	GenericUnderline
)

const (
	Text TokenType = 8000 + iota
	TextWhitespace
	TextSymbol
	TextPunctuation
)

const (
	Punctuation TokenType = 5000 + iota
)

type TokeniseOptions struct {
	// State to start tokenisation in. Defaults to "root".
	State string
}

type Trilean uint8

const (
	Pass Trilean = iota
	Yes
	No
)