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

package examples

import (
	"fmt"

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

type Chunks []string

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

	parser := parsekit.NewParser(func(p *parsekit.ParseAPI) {
		for p.On(chunkOfRunes).Accept() {
			*l = append(*l, p.Result().String())
		}
	})
	return parser.Execute(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"]
}