Add num.parse.

tests/corelib/num_parse_test.dart

+// Copyright (c) 2013 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";
+
+const whiteSpace = const [
+  "",
+  "\x09",
+  "\x0a",
+  "\x0b",
+  "\x0c",
+  "\x0d",
+  "\x85",
+  "\xa0",
+  "\u1680",
+  "\u180e",
+  "\u2000",
+  "\u2001",
+  "\u2002",
+  "\u2003",
+  "\u2004",
+  "\u2005",
+  "\u2006",
+  "\u2007",
+  "\u2008",
+  "\u2009",
+  "\u200a",
+  "\u2028",
+  "\u2029",
+  "\u202f",
+  "\u205f",
+  "\u3000",
+  "\uFEFF"
+];
+
+void testParse(String source, num result) {
+  for (String ws1 in whiteSpace) {
+    for (String ws2 in whiteSpace) {
+      String padded = "$ws1$source$ws2";
+      // Use Expect.identical because it also handles NaN and 0.0/-0.0.
+      // Except on dart2js: http://dartbug.com/11551
+      Expect.identical(result, num.parse(padded), "parse '$padded'");
+      padded = "$ws1$ws2$source";
+      Expect.identical(result, num.parse(padded), "parse '$padded'");
+      padded = "$source$ws1$ws2";
+      Expect.identical(result, num.parse(padded), "parse '$padded'");
+    }
+  }
+}
+
+void testInt(int value) {
+  testParse("$value", value);
+  testParse("+$value", value);
+  testParse("-$value", -value);
+  var hex = "0x${value.toRadixString(16)}";
+  var lchex = hex.toLowerCase();
+  testParse(lchex, value);
+  testParse("+$lchex", value);
+  testParse("-$lchex", -value);
+  var uchex = hex.toUpperCase();
+  testParse(uchex, value);
+  testParse("+$uchex", value);
+  testParse("-$uchex", -value);
+}
+
+void testIntAround(int value) {
+  testInt(value - 1);
+  testInt(value);
+  testInt(value + 1);
+}
+
+void testDouble(double value) {
+  testParse("$value", value);
+  testParse("+$value", value);
+  testParse("-$value", -value);
+  if (value.isFinite) {
+    String exp = value.toStringAsExponential();
+    String lcexp = exp.toLowerCase();
+    testParse(lcexp, value);
+    testParse("+$lcexp", value);
+    testParse("-$lcexp", -value);
+    String ucexp = exp.toUpperCase();
+    testParse(ucexp, value);
+    testParse("+$ucexp", value);
+    testParse("-$ucexp", -value);
+  }
+}
+
+void testFail(String source) {
+  var object = new Object();
+  Expect.throws(() {
+    num.parse(source, (s) {
+      Expect.equals(source, s);
+      throw object;
+    });
+  }, (e) => identical(object, e), "Fail: '$source'");
+}
+
+void main() {
+  testInt(0);
+  testInt(1);
+  testInt(9);
+  testInt(10);
+  testInt(99);
+  testInt(100);
+  testIntAround(256);
+  testIntAround(0x80000000);  // 2^31
+  testIntAround(0x100000000);  // 2^32
+  testIntAround(0x10000000000000);  // 2^52
+  testIntAround(0x20000000000000);  // 2^53
+  testIntAround(0x40000000000000);  // 2^54
+  testIntAround(0x8000000000000000);  // 2^63
+  testIntAround(0x10000000000000000);  // 2^64
+  testIntAround(0x100000000000000000000);  // 2^80
+
+  testDouble(0.0);
+  testDouble(5e-324);
+  testDouble(2.225073858507201e-308);
+  testDouble(2.2250738585072014e-308);
+  testDouble(0.49999999999999994);
+  testDouble(0.5);
+  testDouble(0.50000000000000006);
+  testDouble(0.9999999999999999);
+  testDouble(1.0);
+  testDouble(1.0000000000000002);
+  testDouble(4294967295.0);
+  testDouble(4294967296.0);
+  testDouble(4503599627370495.5);
+  testDouble(4503599627370497.0);
+  testDouble(9007199254740991.0);
+  testDouble(9007199254740992.0);
+  testDouble(1.7976931348623157e+308);
+  testDouble(double.INFINITY);
+  testDouble(double.NAN);          /// 01: ok
+
+  // Strings that cannot occur from toString of a number.
+  testParse("000000000000", 0);
+  testParse("000000000001", 1);
+  testParse("000000000000.0000000000000", 0.0);
+  testParse("000000000001.0000000000000", 1.0);
+  testParse("0x0000000000", 0);
+  testParse("0e0", 0.0);
+  testParse("0e+0", 0.0);
+  testParse("0e-0", 0.0);
+  testParse("-0e0", -0.0);
+  testParse("-0e+0", -0.0);
+  testParse("-0e-0", -0.0);
+  testParse("1e0", 1.0);
+  testParse("1e+0", 1.0);
+  testParse("1e-0", 1.0);
+  testParse("-1e0", -1.0);
+  testParse("-1e+0", -1.0);
+  testParse("-1e-0", -1.0);
+  testParse("1.", 1.0);
+  testParse(".1", 0.1);
+  testParse("1.e1", 10.0);
+  testParse(".1e1", 1.0);
+
+  // Negative tests - things not to allow.
+
+  // Spaces inside the numeral.
+  testFail("- 1");
+  testFail("+ 1");
+  testFail("2 2");
+  testFail("0x 42");
+  testFail("1 .");
+  testFail(". 1");
+  testFail("1e 2");
+  testFail("1 e2");
+  // Invalid characters.
+  testFail("0x1H");
+  testFail("12H");
+  testFail("1x2");
+  testFail("00x2");
+  // Empty hex number.
+  testFail("0x");
+  testFail("-0x");
+  testFail("+0x");
+  // Double exponent without value.
+  testFail("e1");
+  testFail("e+1");
+  testFail("e-1");
+  testFail("-e1");
+  testFail("-e+1");
+  testFail("-e-1");
+  // Incorrect ways to write NaN/Infinity.
+  testFail("infinity");
+  testFail("INFINITY");
+  testFail("inf");
+  testFail("nan");
+  testFail("NAN");
+  testFail("qnan");
+  testFail("snan");
+}