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| 1 // Copyright (c) 2013, 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 library matcher.pretty_print; | |
| 6 | |
| 7 import 'description.dart'; | |
| 8 import 'interfaces.dart'; | |
| 9 | |
| 10 /// Returns a pretty-printed representation of [object]. | |
| 11 /// | |
| 12 /// If [maxLineLength] is passed, this will attempt to ensure that each line is | |
| 13 /// no longer than [maxLineLength] characters long. This isn't guaranteed, since | |
| 14 /// individual objects may have string representations that are too long, but | |
| 15 /// most lines will be less than [maxLineLength] long. | |
| 16 /// | |
| 17 /// If [maxItems] is passed, [Iterable]s and [Map]s will only print their first | |
| 18 /// [maxItems] members or key/value pairs, respectively. | |
| 19 String prettyPrint(object, {int maxLineLength, int maxItems}) { | |
| 20 String _prettyPrint(object, int indent, Set seen, bool top) { | |
| 21 // If the object is a matcher, use its description. | |
| 22 if (object is Matcher) { | |
| 23 var description = new StringDescription(); | |
| 24 object.describe(description); | |
| 25 return "<$description>"; | |
| 26 } | |
| 27 | |
| 28 // Avoid looping infinitely on recursively-nested data structures. | |
| 29 if (seen.contains(object)) return "(recursive)"; | |
| 30 seen = seen.union(new Set.from([object])); | |
| 31 String pp(child) => _prettyPrint(child, indent + 2, seen, false); | |
| 32 | |
| 33 if (object is Iterable) { | |
| 34 // Print the type name for non-List iterables. | |
| 35 var type = object is List ? "" : _typeName(object) + ":"; | |
| 36 | |
| 37 // Truncate the list of strings if it's longer than [maxItems]. | |
| 38 var strings = object.map(pp).toList(); | |
| 39 if (maxItems != null && strings.length > maxItems) { | |
| 40 strings.replaceRange(maxItems - 1, strings.length, ['...']); | |
| 41 } | |
| 42 | |
| 43 // If the printed string is short and doesn't contain a newline, print it | |
| 44 // as a single line. | |
| 45 var singleLine = "$type[${strings.join(', ')}]"; | |
| 46 if ((maxLineLength == null || | |
| 47 singleLine.length + indent <= maxLineLength) && | |
| 48 !singleLine.contains("\n")) { | |
| 49 return singleLine; | |
| 50 } | |
| 51 | |
| 52 // Otherwise, print each member on its own line. | |
| 53 return "$type[\n" + strings.map((string) { | |
| 54 return _indent(indent + 2) + string; | |
| 55 }).join(",\n") + "\n" + _indent(indent) + "]"; | |
| 56 } else if (object is Map) { | |
| 57 // Convert the contents of the map to string representations. | |
| 58 var strings = object.keys.map((key) { | |
| 59 return '${pp(key)}: ${pp(object[key])}'; | |
| 60 }).toList(); | |
| 61 | |
| 62 // Truncate the list of strings if it's longer than [maxItems]. | |
| 63 if (maxItems != null && strings.length > maxItems) { | |
| 64 strings.replaceRange(maxItems - 1, strings.length, ['...']); | |
| 65 } | |
| 66 | |
| 67 // If the printed string is short and doesn't contain a newline, print it | |
| 68 // as a single line. | |
| 69 var singleLine = "{${strings.join(", ")}}"; | |
| 70 if ((maxLineLength == null || | |
| 71 singleLine.length + indent <= maxLineLength) && | |
| 72 !singleLine.contains("\n")) { | |
| 73 return singleLine; | |
| 74 } | |
| 75 | |
| 76 // Otherwise, print each key/value pair on its own line. | |
| 77 return "{\n" + strings.map((string) { | |
| 78 return _indent(indent + 2) + string; | |
| 79 }).join(",\n") + "\n" + _indent(indent) + "}"; | |
| 80 } else if (object is String) { | |
| 81 // Escape strings and print each line on its own line. | |
| 82 var lines = object.split("\n"); | |
| 83 return "'" + lines.map(_escapeString) | |
| 84 .join("\\n'\n${_indent(indent + 2)}'") + "'"; | |
| 85 } else { | |
| 86 var value = object.toString().replaceAll("\n", _indent(indent) + "\n"); | |
| 87 var defaultToString = value.startsWith("Instance of "); | |
| 88 | |
| 89 // If this is the top-level call to [prettyPrint], wrap the value on angle | |
| 90 // brackets to set it apart visually. | |
| 91 if (top) value = "<$value>"; | |
| 92 | |
| 93 // Print the type of objects with custom [toString] methods. Primitive | |
| 94 // objects and objects that don't implement a custom [toString] don't need | |
| 95 // to have their types printed. | |
| 96 if (object is num || object is bool || object is Function || | |
| 97 object == null || defaultToString) { | |
| 98 return value; | |
| 99 } else { | |
| 100 return "${_typeName(object)}:$value"; | |
| 101 } | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 return _prettyPrint(object, 0, new Set(), true); | |
| 106 } | |
| 107 | |
| 108 String _indent(int length) => new List.filled(length, ' ').join(''); | |
| 109 | |
| 110 /// Returns the name of the type of [x], or "Unknown" if the type name can't be | |
| 111 /// determined. | |
| 112 String _typeName(x) { | |
| 113 // dart2js blows up on some objects (e.g. window.navigator). | |
| 114 // So we play safe here. | |
| 115 try { | |
| 116 if (x == null) return "null"; | |
| 117 var type = x.runtimeType.toString(); | |
| 118 // TODO(nweiz): if the object's type is private, find a public superclass to | |
| 119 // display once there's a portable API to do that. | |
| 120 return type.startsWith("_") ? "?" : type; | |
| 121 } catch (e) { | |
| 122 return "?"; | |
| 123 } | |
| 124 } | |
| 125 | |
| 126 /// Returns [source] with any control characters replaced by their escape | |
| 127 /// sequences. | |
| 128 /// | |
| 129 /// This doesn't add quotes to the string, but it does escape single quote | |
| 130 /// characters so that single quotes can be applied externally. | |
| 131 String _escapeString(String source) => | |
| 132 source.split("").map(_escapeChar).join(""); | |
| 133 | |
| 134 /// Return the escaped form of a character [ch]. | |
| 135 String _escapeChar(String ch) { | |
| 136 if (ch == "'") | |
| 137 return "\\'"; | |
| 138 else if (ch == '\n') | |
| 139 return '\\n'; | |
| 140 else if (ch == '\r') | |
| 141 return '\\r'; | |
| 142 else if (ch == '\t') | |
| 143 return '\\t'; | |
| 144 else | |
| 145 return ch; | |
| 146 } | |
| 147 | |
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Chromium Code Reviews
Issue 807193003:
Re-apply "Remove unittest and matcher from the repo." (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart