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Side by Side Diff: lib/unittest/description.dart

Issue 10836241: Move unittest from lib to pkg. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 8 years, 4 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4 /**
5 * The default implementation of IDescription. This should rarely need
6 * substitution, although conceivably it is a place where other languages
7 * could be supported.
8 */
9
10 class StringDescription implements Description {
11 var _out;
12
13 /** Initialize the description with initial contents [init]. */
14 StringDescription([String init = '']) {
15 _out = init;
16 }
17
18 /** Get the description as a string. */
19 String toString() => _out;
20
21 /** Append some plain [text] to the description. */
22 Description add(String text) {
23 _out = '${_out}${text}';
24 return this;
25 }
26
27 /** Change the value of the description. */
28 Description replace(String text) {
29 _out = text;
30 return this;
31 }
32
33 /**
34 * Appends a description of [value]. If it is an IMatcher use its
35 * describe method; if it is a string use its literal value after
36 * escaping any embedded control characters; otherwise use its
37 * toString() value and wrap it in angular "quotes".
38 */
39 Description addDescriptionOf(value) {
40 if (value is Matcher) {
41 value.describe(this);
42 } else if (value is String) {
43 _addEscapedString(value);
44 } else {
45 String description = (value == null) ? "null" : value.toString();
46 if (description.startsWith('<') && description.endsWith('>')) {
47 add(description);
48 } else {
49 add('<');
50 add(description);
51 add('>');
52 }
53 }
54 return this;
55 }
56
57 /**
58 * Append an [Iterable] [list] of objects to the description, using the
59 * specified [separator] and framing the list with [start]
60 * and [end].
61 */
62 Description addAll(String start, String separator, String end,
63 Iterable list) {
64 var separate = false;
65 add(start);
66 for (var item in list) {
67 if (separate) {
68 add(separator);
69 }
70 addDescriptionOf(item);
71 separate = true;
72 }
73 add(end);
74 return this;
75 }
76
77 /** Escape the control characters in [string] so that they are visible. */
78 _addEscapedString(String string) {
79 add("'");
80 for (var i = 0; i < string.length; i++) {
81 add(_escape(string[i]));
82 }
83 add("'");
84 }
85
86 /** Return the escaped form of a character [ch]. */
87 _escape(ch) {
88 if (ch == "'")
89 return "\'";
90 else if (ch == '\n')
91 return '\\n';
92 else if (ch == '\r')
93 return '\\r';
94 else if (ch == '\t')
95 return '\\t';
96 else
97 return ch;
98 }
99 }
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