// In this example, we show that any type can be extended into a parser,
// filling that type with data from the Handler methods.
//
// Here, we create a custom type 'Chunks', which is an alias
// for []string. We add a Handler method directly to that type
// and let the parsing code append items to the slice during parsing.

package examples

import (
	"fmt"

	"git.makaay.nl/mauricem/go-parsekit/parse"
	"git.makaay.nl/mauricem/go-parsekit/tokenize"
)

type Chunks []string

func (l *Chunks) AddChopped(s string, chunkSize int) error {
	c, a := tokenize.C, tokenize.A
	chunkOfRunes := c.MinMax(1, chunkSize, a.AnyRune)

	parseChunks := parse.New(func(p *parse.API) {
		for p.Accept(chunkOfRunes) {
			*l = append(*l, p.Result.String())
		}
	})
	return parseChunks(s)
}

func Example_usingSliceAsParserState() {
	chunks := &Chunks{}
	chunks.AddChopped("123412341234xxx", 4)
	chunks.AddChopped("1234567812345678xxxxx", 8)

	fmt.Printf("Matches = %q", *chunks)
	// Output:
	// Matches = ["1234" "1234" "1234" "xxx" "12345678" "12345678" "xxxxx"]
}