package tokenize

import "unicode/utf8"

// Result holds the bytes and tokens as produced by the tokenizer.
type Result struct {
	api        *API
	bytesStart int // the starting point in the API.bytes slice for runes produced by this stack level
	bytesEnd   int // the end point in the API.bytes slice for runes produced by this stack level
	tokenStart int // the starting point in the API.tokens slice for tokens produced by this stack level
	tokenEnd   int // the end point in the API.tokens slice for tokens produced by this stack level
}

func (result *Result) Store() {
	p := result.api.pointers
	result.bytesStart = p.bytesStart
	result.bytesEnd = p.bytesEnd
	result.tokenStart = p.tokenStart
	result.tokenEnd = p.tokenEnd
}

func (result *Result) Clear() {
	result.bytesStart = 0
	result.bytesEnd = 0
	result.tokenStart = 0
	result.tokenEnd = 0
}

func (result *Result) String() string {
	return string(result.api.outputBytes[result.bytesStart:result.bytesEnd])
}

func (result *Result) Byte(offset int) byte {
	return result.api.outputBytes[result.bytesStart+offset]
}

func (result *Result) Bytes() []byte {
	return result.api.outputBytes[result.bytesStart:result.bytesEnd]
}

func (result *Result) Rune(offset int) rune {
	r, _ := utf8.DecodeRune(result.api.outputBytes[result.bytesStart+offset:])
	return r
}

func (result *Result) Runes() []rune {
	return []rune(result.String())
}

func (result *Result) Token(offset int) Token {
	a := result.api
	return a.outputTokens[result.tokenStart+offset]
}

func (result *Result) Tokens() []Token {
	return result.api.outputTokens[result.tokenStart:result.tokenEnd]
}