string_replace_test.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import "package:expect/expect.dart";

main() {
  // Test replaceFirst.
  Expect.equals("AtoBtoCDtoE", "AfromBtoCDtoE".replaceFirst("from", "to"));

  // Test with the replaced string at the beginning.
  Expect.equals("toABtoCDtoE", "fromABtoCDtoE".replaceFirst("from", "to"));

  // Test with the replaced string at the end.
  Expect.equals("toABtoCDtoEto", "fromABtoCDtoEto".replaceFirst("from", "to"));

  // Test when there are no occurrence of the string to replace.
  Expect.equals("ABC", "ABC".replaceFirst("from", "to"));

  // Test when the string to change is the empty string.
  Expect.equals("", "".replaceFirst("from", "to"));

  // Test when the string to change is a substring of the string to
  // replace.
  Expect.equals("fro", "fro".replaceFirst("from", "to"));

  // Test when the string to change is the replaced string.
  Expect.equals("to", "from".replaceFirst("from", "to"));

  // Test when the string to change is the replacement string.
  Expect.equals("to", "to".replaceFirst("from", "to"));

  // Test replacing by the empty string.
  Expect.equals("", "from".replaceFirst("from", ""));
  Expect.equals("AB", "AfromB".replaceFirst("from", ""));

  // Test changing the empty string.
  Expect.equals("to", "".replaceFirst("", "to"));

  // Test replacing the empty string.
  Expect.equals("toAtoBtoCto", "AtoBtoCto".replaceFirst("", "to"));

  // Test startIndex.
  Expect.equals(
    "foo-AAA-foo-bar",
    "foo-bar-foo-bar".replaceFirst("bar", "AAA", 4),
  );

  // Test startIndex skipping one case at the beginning.
  Expect.equals(
    "foo-bar-AAA-bar",
    "foo-bar-foo-bar".replaceFirst("foo", "AAA", 1),
  );

  // Test startIndex skipping one case at the beginning.
  Expect.equals(
    "foo-bar-foo-AAA",
    "foo-bar-foo-bar".replaceFirst("bar", "AAA", 5),
  );

  // Test startIndex replacing with the empty string.
  Expect.equals("foo-bar--bar", "foo-bar-foo-bar".replaceFirst("foo", "", 1));

  // Test startIndex with a RegExp with carat
  Expect.equals(
    "foo-bar-foo-bar",
    "foo-bar-foo-bar".replaceFirst(new RegExp(r"^foo"), "", 8),
  );

  // Test startIndex with a RegExp
  Expect.equals(
    "aaa{3}X{3}",
    "aaa{3}aaa{3}".replaceFirst(new RegExp(r"a{3}"), "X", 1),
  );

  // Test startIndex with regexp-looking String
  Expect.equals("aaa{3}aaX", "aaa{3}aaa{3}".replaceFirst("a{3}", "X", 3));

  // Test negative startIndex
  Expect.throwsRangeError(() => "hello".replaceFirst("h", "X", -1));

  // Test startIndex too large
  Expect.throwsRangeError(() => "hello".replaceFirst("h", "X", 6));

  // Test replaceFirstMapped.
  Expect.equals(
    "AtoBtoCDtoE",
    "AfromBtoCDtoE".replaceFirstMapped("from", (_) => "to"),
  );

  // Test with the replaced string at the beginning.
  Expect.equals(
    "toABtoCDtoE",
    "fromABtoCDtoE".replaceFirstMapped("from", (_) => "to"),
  );

  // Test with the replaced string at the end.
  Expect.equals(
    "toABtoCDtoEto",
    "fromABtoCDtoEto".replaceFirstMapped("from", (_) => "to"),
  );

  // Test when there are no occurrence of the string to replace.
  Expect.equals("ABC", "ABC".replaceFirstMapped("from", (_) => "to"));

  // Test when the string to change is the empty string.
  Expect.equals("", "".replaceFirstMapped("from", (_) => "to"));

  // Test when the string to change is a substring of the string to
  // replace.
  Expect.equals("fro", "fro".replaceFirstMapped("from", (_) => "to"));

  // Test when the string to change is the replaced string.
  Expect.equals("to", "from".replaceFirstMapped("from", (_) => "to"));

  // Test when the string to change is the replacement string.
  Expect.equals("to", "to".replaceFirstMapped("from", (_) => "to"));

  // Test replacing by the empty string.
  Expect.equals("", "from".replaceFirstMapped("from", (_) => ""));
  Expect.equals("AB", "AfromB".replaceFirstMapped("from", (_) => ""));

  // Test changing the empty string.
  Expect.equals("to", "".replaceFirstMapped("", (_) => "to"));

  // Test replacing the empty string.
  Expect.equals("toAtoBtoCto", "AtoBtoCto".replaceFirstMapped("", (_) => "to"));

  // Test startIndex.
  Expect.equals(
    "foo-AAA-foo-bar",
    "foo-bar-foo-bar".replaceFirstMapped("bar", (_) => "AAA", 4),
  );

  // Test startIndex skipping one case at the beginning.
  Expect.equals(
    "foo-bar-AAA-bar",
    "foo-bar-foo-bar".replaceFirstMapped("foo", (_) => "AAA", 1),
  );

  // Test startIndex skipping one case at the beginning.
  Expect.equals(
    "foo-bar-foo-AAA",
    "foo-bar-foo-bar".replaceFirstMapped("bar", (_) => "AAA", 5),
  );

  // Test startIndex replacing with the empty string.
  Expect.equals(
    "foo-bar--bar",
    "foo-bar-foo-bar".replaceFirstMapped("foo", (_) => "", 1),
  );

  // Test startIndex with a RegExp with carat
  Expect.equals(
    "foo-bar-foo-bar",
    "foo-bar-foo-bar".replaceFirstMapped(new RegExp(r"^foo"), (_) => "", 8),
  );

  // Test startIndex with a RegExp
  Expect.equals(
    "aaa{3}X{3}",
    "aaa{3}aaa{3}".replaceFirstMapped(new RegExp(r"a{3}"), (_) => "X", 1),
  );

  // Test startIndex with regexp-looking String
  Expect.equals(
    "aaa{3}aaX",
    "aaa{3}aaa{3}".replaceFirstMapped("a{3}", (_) => "X", 3),
  );

  // Test negative startIndex
  Expect.throwsRangeError(
    () => "hello".replaceFirstMapped("h", (_) => "X", -1),
  );

  // Test startIndex too large
  Expect.throwsRangeError(() => "hello".replaceFirstMapped("h", (_) => "X", 6));

  // Test replacement depending on argument.
  Expect.equals(
    "foo-BAR-foo-bar",
    "foo-bar-foo-bar".replaceFirstMapped("bar", (v) => v[0]!.toUpperCase()),
  );

  Expect.equals(
    "foo-[bar]-foo-bar",
    "foo-bar-foo-bar".replaceFirstMapped("bar", (v) => "[${v[0]}]"),
  );

  Expect.equals(
    "foo-foo-bar-foo-bar-foo-bar",
    "foo-bar-foo-bar".replaceFirstMapped("bar", (v) => v.input),
  );

  // Test replacement throwing.
  Expect.throws(
    () => "foo-bar".replaceFirstMapped("bar", (v) => throw 42),
    (e) => e == 42,
  );

  // Test replacement returning non-String.
  var o = new Object();
  Expect.equals(
    "foo-$o",
    "foo-bar".replaceFirstMapped("bar", (v) {
      // TODO(jmesserly): in strong mode, this function must return a string.
      // If we want to allow any Object, we'll have to fix the API signature.
      // See https://github.com/dart-lang/sdk/issues/30248.
      return '$o';
    }),
  );

  for (var string in ["", "x", "foo", "x\u2000z"]) {
    for (var replacement in ["", "foo", string]) {
      for (int start = 0; start <= string.length; start++) {
        var expect;
        for (int end = start; end <= string.length; end++) {
          expect =
              string.substring(0, start) + replacement + string.substring(end);
          Expect.equals(
            expect,
            string.replaceRange(start, end, replacement),
            '"$string"[$start:$end]="$replacement"',
          );
        }
        // Reuse expect from "end == string.length" case when omitting end.
        Expect.equals(
          expect,
          string.replaceRange(start, null, replacement),
          '"$string"[$start:]="$replacement"',
        );
      }
    }
    Expect.throws(() => string.replaceRange(-1, 0, "x"));
    Expect.throws(() => string.replaceRange(0, string.length + 1, "x"));
  }
}