ajohnsen@google.com
32eeecd930
BUG= Review URL: https://codereview.chromium.org//11801008 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@16689 260f80e4-7a28-3924-810f-c04153c831b5
72 lines
2.4 KiB
Dart
72 lines
2.4 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Dart core library.
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// VM implementation of int.
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patch class int {
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static int _parse(String str) native "Integer_parse";
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static int _throwFormatException(String source) {
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throw new FormatException(source);
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}
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/* patch */ static int parse(String source,
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{ int radix,
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int onError(String str) }) {
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if (source is! String) throw new ArgumentError(source);
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if (radix == null) {
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if (onError == null) return _parse(source);
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try {
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return _parse(source);
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} on FormatException {
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return onError(source);
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}
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}
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if (radix is! int) throw new ArgumentError("Radix is not an integer");
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if (radix < 2 || radix > 36) {
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throw new RangeError("Radix $radix not in range 2..36");
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}
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if (onError == null) {
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onError = _throwFormatException;
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}
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// Remove leading and trailing white space.
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source = source.trim();
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if (source.isEmpty) return onError(source);
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bool negative = false;
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int result = 0;
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// The value 99 is used to represent a non-digit. It is too large to be
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// a digit value in any of the used bases.
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const NA = 99;
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const List<int> digits = const <int>[
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00, 01, 02, 03, 04, 05, 06, 07, 08, 09, NA, NA, NA, NA, NA, NA, // 0x30
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NA, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 0x40
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25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, NA, NA, NA, NA, NA, // 0x50
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NA, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 0x60
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25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, NA, NA, NA, NA, NA, // 0x70
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];
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int i = 0;
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int code = source.charCodeAt(i);
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if (code == 0x2d || code == 0x2b) { // Starts with a plus or minus-sign.
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negative = (code == 0x2d);
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if (source.length == 1) return onError(source);
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i = 1;
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code = source.charCodeAt(i);
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}
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do {
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if (code < 0x30 || code > 0x7f) return onError(source);
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int digit = digits[code - 0x30];
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if (digit >= radix) return onError(source);
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result = result * radix + digit;
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i++;
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if (i == source.length) break;
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code = source.charCodeAt(i);
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} while (true);
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return negative ? -result : result;
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}
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}
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