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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package strings_test
import (
"reflect"
. "strings"
"testing"
)
func TestFinderNext(t *testing.T) {
testCases := []struct {
pat, text string
index int
}{
{"", "", 0},
{"", "abc", 0},
{"abc", "", -1},
{"abc", "abc", 0},
{"d", "abcdefg", 3},
{"nan", "banana", 2},
{"pan", "anpanman", 2},
{"nnaaman", "anpanmanam", -1},
{"abcd", "abc", -1},
{"abcd", "bcd", -1},
{"bcd", "abcd", 1},
{"abc", "acca", -1},
{"aa", "aaa", 0},
{"baa", "aaaaa", -1},
{"at that", "which finally halts. at that point", 22},
}
for _, tc := range testCases {
got := StringFind(tc.pat, tc.text)
want := tc.index
if got != want {
t.Errorf("stringFind(%q, %q) got %d, want %d\n", tc.pat, tc.text, got, want)
}
}
}
func TestFinderCreation(t *testing.T) {
testCases := []struct {
pattern string
bad [256]int
suf []int
}{
{
"abc",
[256]int{'a': 2, 'b': 1, 'c': 3},
[]int{5, 4, 1},
},
{
"mississi",
[256]int{'i': 3, 'm': 7, 's': 1},
[]int{15, 14, 13, 7, 11, 10, 7, 1},
},
// From https://www.cs.utexas.edu/~moore/publications/fstrpos.pdf
{
"abcxxxabc",
[256]int{'a': 2, 'b': 1, 'c': 6, 'x': 3},
[]int{14, 13, 12, 11, 10, 9, 11, 10, 1},
},
{
"abyxcdeyx",
[256]int{'a': 8, 'b': 7, 'c': 4, 'd': 3, 'e': 2, 'y': 1, 'x': 5},
[]int{17, 16, 15, 14, 13, 12, 7, 10, 1},
},
}
for _, tc := range testCases {
bad, good := DumpTables(tc.pattern)
for i, got := range bad {
want := tc.bad[i]
if want == 0 {
want = len(tc.pattern)
}
if got != want {
t.Errorf("boyerMoore(%q) bad['%c']: got %d want %d", tc.pattern, i, got, want)
}
}
if !reflect.DeepEqual(good, tc.suf) {
t.Errorf("boyerMoore(%q) got %v want %v", tc.pattern, good, tc.suf)
}
}
}