Big merge from experimental to bleeding edge.

tests/corelib/json_test.dart

+// Copyright (c) 2012, 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 "dart:json";
+
+bool badFormat(e) => e is FormatException;
+
+void testJson(json, expected) {
+  var value = parse(json);
+  compare(expected, actual, path) {
+    if (expected is List) {
+      Expect.isTrue(actual is List);
+      Expect.equals(expected.length, actual.length, "$path: List length");
+      for (int i = 0; i < expected.length; i++) {
+        compare(expected[i], actual[i], "$path[$i]");
+      }
+    } else if (expected is Map) {
+      Expect.isTrue(actual is Map);
+      Expect.equals(expected.length, actual.length, "$path: Map size");
+      expected.forEach((key, value) {
+        Expect.isTrue(actual.containsKey(key));
+        compare(value, actual[key], "$path[$key]");
+      });
+    } else if (expected is num) {
+      Expect.equals(expected is int, actual is int, "$path: same number type");
+      Expect.isTrue(expected.compareTo(actual) == 0,
+                    "$path: $expected vs. $actual");
+    } else {
+      // String, bool, null.
+      Expect.equals(expected, actual, path);
+    }
+  }
+  compare(expected, value, "value");
+}
+
+void testThrows(json) {
+  Expect.throws(() => parse(json), badFormat);
+}
+
+testNumbers() {
+  // Positive tests for number formats.
+  var integerList = ["0","9","9999"];
+  var signList = ["", "-"];
+  var fractionList = ["", ".0", ".1", ".99999"];
+  var exponentList = [""];
+  for (var exphead in ["e", "E", "e-", "E-", "e+", "E+"]) {
+    for (var expval in ["0", "1", "200"]) {
+      exponentList.add("$exphead$expval");
+    }
+  }
+
+  for (var integer in integerList) {
+    for (var sign in signList) {
+      for (var fraction in fractionList) {
+        for (var exp in exponentList) {
+          var literal = "$sign$integer$fraction$exp";
+          var parseNumber =
+              ((fraction == "" && exp == "") ? (String x) => int.parse(x)
+                                             : (String x) => double.parse(x));
+          var expectedValue = parseNumber(literal);
+          testJson(literal, expectedValue);
+        }
+      }
+    }
+  }
+
+  // Negative tests (syntax error).
+  // testError thoroughly tests the given parts with a lot of valid
+  // values for the other parts.
+  testError({signs, integers, fractions, exponents}) {
+    def(value, defaultValue) {
+      if (value == null) return defaultValue;
+      if (value is List) return value;
+      return [value];
+    }
+    signs = def(signs, signList);
+    integers = def(integers, integerList);
+    fractions = def(fractions, fractionList);
+    exponents = def(exponents, exponentList);
+    for (var integer in integers) {
+      for (var sign in signs) {
+        for (var fraction in fractions) {
+          for (var exponent in exponents) {
+            var literal = "$sign$integer$fraction$exponent";
+            testThrows(literal);
+          }
+        }
+      }
+    }
+  }
+  // Doubles overflow to Infinity.
+  testJson("1e+400", double.INFINITY);
+  // (Integers do not, but we don't have those on dart2js).
+
+  // Integer part cannot be omitted:
+  testError(integers: "");
+  // Initial zero only allowed for zero integer part.
+  testError(integers: ["00", "01"]);
+  // Only minus allowed as sign.
+  testError(signs: "+");
+  // Requires digits after decimal point.
+  testError(fractions: ".");
+  // Requires exponent digts, and only digits.
+  testError(exponents: ["e", "e+", "e-", "e.0"]);
+
+  // No whitespace inside numbers.
+  testThrows("- 2.2e+2");
+  testThrows("-2 .2e+2");
+  testThrows("-2. 2e+2");
+  testThrows("-2.2 e+2");
+  testThrows("-2.2e +2");
+  testThrows("-2.2e+ 2");
+
+  testThrows("[2.,2]");
+  testThrows("{2.:2}");
+}
+
+testStrings() {
+  // String parser accepts and understands escapes.
+  var input = r'"\u0000\uffff\n\r\f\t\b\/\\\"' '\x20\ufffd\uffff"';
+  var expected = "\u0000\uffff\n\r\f\t\b\/\\\"\x20\ufffd\uffff";
+  testJson(input, expected);
+  // Empty string.
+  testJson(r'""', "");
+  // Escape first.
+  testJson(r'"\"........"', "\"........");
+  // Escape last.
+  testJson(r'"........\""', "........\"");
+  // Escape middle.
+  testJson(r'"....\"...."', "....\"....");
+
+  // Does not accept single quotes.
+  testThrows(r"''");
+  // Throws on unterminated strings.
+  testThrows(r'"......\"');
+  // Throws on unterminated escapes.
+  testThrows(r'"\');  // ' is not escaped.
+  testThrows(r'"\a"');
+  testThrows(r'"\u"');
+  testThrows(r'"\u1"');
+  testThrows(r'"\u12"');
+  testThrows(r'"\u123"');
+  testThrows(r'"\ux"');
+  testThrows(r'"\u1x"');
+  testThrows(r'"\u12x"');
+  testThrows(r'"\u123x"');
+  // Throws on bad escapes.
+  testThrows(r'"\a"');
+  testThrows(r'"\x00"');
+  testThrows(r'"\c2"');
+  testThrows(r'"\000"');
+  testThrows(r'"\u{0}"');
+  testThrows(r'"\%"');
+  testThrows('"\\\x00"'); // Not raw string!
+  // Throws on control characters.
+  for (int i = 0; i < 32; i++) {
+    var string = new String.fromCharCodes([0x22,i,0x22]); // '"\x00"' etc.
+    testThrows(string);
+  }
+}
+
+
+testObjects() {
+  testJson(r'{}', {});
+  testJson(r'{"x":42}', {"x":42});
+  testJson(r'{"x":{"x":{"x":42}}}', {"x": {"x": {"x": 42}}});
+  testJson(r'{"x":10,"x":42}', {"x": 42});
+  testJson(r'{"":42}', {"": 42});
+
+  // Keys must be strings.
+  testThrows(r'{x:10}');
+  testThrows(r'{true:10}');
+  testThrows(r'{false:10}');
+  testThrows(r'{null:10}');
+  testThrows(r'{42:10}');
+  testThrows(r'{42e1:10}');
+  testThrows(r'{-42:10}');
+  testThrows(r'{["text"]:10}');
+  testThrows(r'{:10}');
+}
+
+testArrays() {
+  testJson(r'[]', []);
+  testJson(r'[1.1e1,"string",true,false,null,{}]',
+           [1.1e1, "string", true, false, null, {}]);
+  testJson(r'[[[[[[]]]],[[[]]],[[]]]]', [[[[[[]]]],[[[]]],[[]]]]);
+  testJson(r'[{},[{}],{"x":[]}]', [{},[{}],{"x":[]}]);
+
+  testThrows(r'[1,,2]');
+  testThrows(r'[1,2,]');
+  testThrows(r'[,2]');
+}
+
+testWords() {
+  testJson(r'true', true);
+  testJson(r'false', false);
+  testJson(r'null', null);
+  testJson(r'[true]', [true]);
+  testJson(r'{"true":true}', {"true": true});
+
+  testThrows(r'truefalse');
+  testThrows(r'trues');
+  testThrows(r'nulll');
+  testThrows(r'full');
+  testThrows(r'nul');
+  testThrows(r'tru');
+  testThrows(r'fals');
+  testThrows(r'\null');
+  testThrows(r't\rue');
+  testThrows(r't\rue');
+}
+
+testWhitespace() {
+  // Valid white-space characters.
+  var v = '\t\r\n\ ';
+  // Invalid white-space and non-recognized characters.
+  var invalids = ['\x00', '\f', '\x08', '\\', '\xa0','\u2028', '\u2029'];
+
+  // Valid whitespace accepted "everywhere".
+  testJson('$v[${v}-2.2e2$v,$v{$v"key"$v:${v}true$v}$v,$v"ab"$v]$v',
+           [-2.2e2, {"key": true}, "ab"]);
+
+  for (var i in invalids) {
+    testThrows('${i}"s"');
+    testThrows('"s"${i}');
+    testThrows('42${i}');
+    testThrows('$i[]');
+    testThrows('[$i]');
+    testThrows('[$i"s"]');
+    testThrows('["s"$i]');
+    testThrows('[]$i');
+    testThrows('$i{"k":"v"}');
+    testThrows('{$i"k":"v"}');
+    testThrows('{"k"$i:"v"}');
+    testThrows('{"k":$i"v"}');
+    testThrows('{"k":"v"$i}');
+    testThrows('{"k":"v"}$i');
+  }
+}
+
+main() {
+  testNumbers();
+  testStrings();
+  testWords();
+  testObjects();
+  testArrays();
+  testWhitespace();
+}