package tokenize

import (
	"git.makaay.nl/mauricem/go-parsekit/common"
)

// Tokenizer is the top-level struct that holds the configuration for
// a parser that is based solely on a TokenHandler function.
// The Tokenizer can be instantiated using the parsekit.NewTokenizer()
// method.
type Tokenizer struct {
	handler TokenHandler
}

// NewTokenizer instantiates a new Tokenizer, based on the provided TokenHandler.
func NewTokenizer(tokenHandler TokenHandler) *Tokenizer {
	return &Tokenizer{tokenHandler}
}

// Execute feeds the input to the wrapped TokenHandler function.
// For an overview of allowed inputs, take a look at the documentation for parsekit.reader.New().
//
// It returns the TokenHandler's TokenHandlerResult. When an error occurred
// during parsing, the error will be set, nil otherwise.
func (t *Tokenizer) Execute(input interface{}) (*TokenHandlerResult, *common.Error) {
	api := NewTokenAPI(input)
	ok := t.handler(api)

	if !ok {
		err := &common.Error{Message: "mismatch", Cursor: common.Cursor{}}
		return nil, err
	}
	return api.Result(), nil
}