package main

import (
	"slices"
	"testing"
)

var reTests = []struct {
	re     string
	str    string
	result []matchIndex
}{
	{"a", "abc", []matchIndex{{0, 1}}},
	{"a", "bca", []matchIndex{{2, 3}}},
	{"l", "ggllgg", []matchIndex{{2, 3}, {3, 4}}},
	{"(b|c)", "abdceb", []matchIndex{{1, 2}, {3, 4}, {5, 6}}},
	{"a*", "brerereraaaaabbbbb", []matchIndex{{8, 13}}},
}

func TestFindAllMatches(t *testing.T) {
	for _, test := range reTests {
		t.Run(test.re+" "+test.str, func(t *testing.T) {
			re_postfix := shuntingYard(test.re)
			startState := thompson(re_postfix)
			matchIndices := findAllMatches(startState, test.str)
			if !slices.Equal(test.result, matchIndices) {
				t.Errorf("Wanted %v	Got %v\n", test.result, matchIndices)
			}
		})
	}
}