// This is the same as the example helloWorldUsingParser1, except that in
// this implementation the state machine is implemented using a combination
// of some TokenHandlers and only a single state, in which multiple
// ParseAPI.On() calls are combined to do all the work in one go.
package parsekit_test

import (
	"fmt"

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

const greeteeItem2 parsekit.ItemType = 1

func stateFullGreeting(p *parsekit.ParseAPI) {
	c, a, m := parsekit.C, parsekit.A, parsekit.M
	if !p.On(c.StrNoCase("hello")).Skip() {
		p.EmitError("the greeting is not being friendly")
		return
	}
	if !p.On(c.Seq(c.Opt(a.Whitespace), a.Comma, c.Opt(a.Whitespace))).Skip() {
		p.EmitError("the greeting is not properly separated")
		return
	}
	if !p.On(m.Trim(c.OneOrMore(c.Except(a.Excl, a.AnyRune)), " \t")).Accept() {
		p.EmitError("the greeting is targeted at thin air")
		return
	}
	if !p.On(a.Excl).Stay() {
		p.EmitError("the greeting is not loud enough")
		return
	}
	if !p.On(a.EndOfFile).Stay() {
		p.EmitError("too much stuff going on after the closing '!'")
		return
	}

	name := p.BufLiteral()
	if name == "" {
		p.EmitError("the name cannot be empty")
	} else {
		p.Emit(greeteeItem, name)
	}

	p.ExpectEndOfFile()
}

func Example_helloWorldUsingParser2() {
	parser := parsekit.NewParser(stateFullGreeting)

	for i, input := range []string{
		"Hello, world!",
		"HELLO ,Johnny!",
		"hello , Bob123!",
		"hello Pizza!",
		"",
		" ",
		"hello",
		"hello,",
		"hello , ",
		"hello , Droopy",
		"hello , Droopy!",
		"hello , \t \t Droopy \t !",
		"Oh no!",
		"hello,!",
		"HELLO, Buster! Eat this!",
	} {
		item, err, ok := parser.Parse(input).Next()
		if !ok {
			fmt.Printf("[%d] Input: %q Error: %s\n", i, input, err)
		} else {
			fmt.Printf("[%d] Input: %q Output: %s\n", i, input, item.Value)
		}
	}
	// Output:
	// [0] Input: "Hello, world!" Error: too much stuff going on after the closing '!'
	// [1] Input: "HELLO ,Johnny!" Error: too much stuff going on after the closing '!'
	// [2] Input: "hello , Bob123!" Error: too much stuff going on after the closing '!'
	// [3] Input: "hello Pizza!" Error: the greeting is not properly separated
	// [4] Input: "" Error: the greeting is not being friendly
	// [5] Input: " " Error: the greeting is not being friendly
	// [6] Input: "hello" Error: the greeting is not properly separated
	// [7] Input: "hello," Error: the greeting is targeted at thin air
	// [8] Input: "hello , " Error: the greeting is targeted at thin air
	// [9] Input: "hello , Droopy" Error: the greeting is not loud enough
	// [10] Input: "hello , Droopy!" Error: too much stuff going on after the closing '!'
	// [11] Input: "hello , \t \t Droopy \t !" Error: too much stuff going on after the closing '!'
	// [12] Input: "Oh no!" Error: the greeting is not being friendly
	// [13] Input: "hello,!" Error: the greeting is targeted at thin air
	// [14] Input: "HELLO, Buster! Eat this!" Error: too much stuff going on after the closing '!'
}