Move js library back into compiler directory.

sdk/lib/_internal/lib/js_number.dart

Index: sdk/lib/_internal/lib/js_number.dart
diff --git a/sdk/lib/_internal/lib/js_number.dart b/sdk/lib/_internal/lib/js_number.dart
deleted file mode 100644
index 3970f03378b0f8060bdd0d20d376746bf5ea9c57..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/lib/js_number.dart
+++ /dev/null
@@ -1,401 +0,0 @@
-// 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.
-
-part of _interceptors;
-
-/**
- * The super interceptor class for [JSInt] and [JSDouble]. The compiler
- * recognizes this class as an interceptor, and changes references to
- * [:this:] to actually use the receiver of the method, which is
- * generated as an extra argument added to each member.
- *
- * Note that none of the methods here delegate to a method defined on JSInt or
- * JSDouble.  This is exploited in [tryComputeConstantInterceptor].
- */
-class JSNumber extends Interceptor implements num {
-  const JSNumber();
-
-  int compareTo(num b) {
-    if (b is! num) throw new ArgumentError(b);
-    if (this < b) {
-      return -1;
-    } else if (this > b) {
-      return 1;
-    } else if (this == b) {
-      if (this == 0) {
-        bool bIsNegative = b.isNegative;
-        if (isNegative == bIsNegative) return 0;
-        if (isNegative) return -1;
-        return 1;
-      }
-      return 0;
-    } else if (isNaN) {
-      if (b.isNaN) {
-        return 0;
-      }
-      return 1;
-    } else {
-      return -1;
-    }
-  }
-
-  bool get isNegative => (this == 0) ? (1 / this) < 0 : this < 0;
-
-  bool get isNaN => JS('bool', r'isNaN(#)', this);
-
-  bool get isInfinite {
-    return JS('bool', r'# == Infinity', this)
-        || JS('bool', r'# == -Infinity', this);
-  }
-
-  bool get isFinite => JS('bool', r'isFinite(#)', this);
-
-  num remainder(num b) {
-    checkNull(b); // TODO(ngeoffray): This is not specified but co19 tests it.
-    if (b is! num) throw new ArgumentError(b);
-    return JS('num', r'# % #', this, b);
-  }
-
-  num abs() => JS('num', r'Math.abs(#)', this);
-
-  num get sign => this > 0 ? 1 : this < 0 ? -1 : this;
-
-  static const int _MIN_INT32 = -0x80000000;
-  static const int _MAX_INT32 = 0x7FFFFFFF;
-
-  int toInt() {
-    if (this >= _MIN_INT32 && this <= _MAX_INT32) {
-      return JS('int', '# | 0', this);
-    }
-    if (JS('bool', r'isFinite(#)', this)) {
-      return JS('int', r'# + 0', truncateToDouble());  // Converts -0.0 to +0.0.
-    }
-    // This is either NaN, Infinity or -Infinity.
-    throw new UnsupportedError(JS("String", "''+#", this));
-  }
-
-  int truncate() => toInt();
-  int ceil() => ceilToDouble().toInt();
-  int floor() => floorToDouble().toInt();
-  int round() => roundToDouble().toInt();
-
-  double ceilToDouble() => JS('num', r'Math.ceil(#)', this);
-
-  double floorToDouble() => JS('num', r'Math.floor(#)', this);
-
-  double roundToDouble() {
-    if (this < 0) {
-      return JS('num', r'-Math.round(-#)', this);
-    } else {
-      return JS('num', r'Math.round(#)', this);
-    }
-  }
-
-  double truncateToDouble() => this < 0 ? ceilToDouble() : floorToDouble();
-
-  num clamp(lowerLimit, upperLimit) {
-    if (lowerLimit is! num) throw new ArgumentError(lowerLimit);
-    if (upperLimit is! num) throw new ArgumentError(upperLimit);
-    if (lowerLimit.compareTo(upperLimit) > 0) {
-      throw new ArgumentError(lowerLimit);
-    }
-    if (this.compareTo(lowerLimit) < 0) return lowerLimit;
-    if (this.compareTo(upperLimit) > 0) return upperLimit;
-    return this;
-  }
-
-  // The return type is intentionally omitted to avoid type checker warnings
-  // from assigning JSNumber to double.
-  toDouble() => this;
-
-  String toStringAsFixed(int fractionDigits) {
-    checkNum(fractionDigits);
-    // TODO(floitsch): fractionDigits must be an integer.
-    if (fractionDigits < 0 || fractionDigits > 20) {
-      throw new RangeError(fractionDigits);
-    }
-    String result = JS('String', r'#.toFixed(#)', this, fractionDigits);
-    if (this == 0 && isNegative) return "-$result";
-    return result;
-  }
-
-  String toStringAsExponential([int fractionDigits]) {
-    String result;
-    if (fractionDigits != null) {
-      // TODO(floitsch): fractionDigits must be an integer.
-      checkNum(fractionDigits);
-      if (fractionDigits < 0 || fractionDigits > 20) {
-        throw new RangeError(fractionDigits);
-      }
-      result = JS('String', r'#.toExponential(#)', this, fractionDigits);
-    } else {
-      result = JS('String', r'#.toExponential()', this);
-    }
-    if (this == 0 && isNegative) return "-$result";
-    return result;
-  }
-
-  String toStringAsPrecision(int precision) {
-    // TODO(floitsch): precision must be an integer.
-    checkNum(precision);
-    if (precision < 1 || precision > 21) {
-      throw new RangeError(precision);
-    }
-    String result = JS('String', r'#.toPrecision(#)',
-                       this, precision);
-    if (this == 0 && isNegative) return "-$result";
-    return result;
-  }
-
-  String toRadixString(int radix) {
-    checkNum(radix);
-    if (radix < 2 || radix > 36) throw new RangeError(radix);
-    return JS('String', r'#.toString(#)', this, radix);
-  }
-
-  // Note: if you change this, also change the function [S].
-  String toString() {
-    if (this == 0 && JS('bool', '(1 / #) < 0', this)) {
-      return '-0.0';
-    } else {
-      return JS('String', r'"" + (#)', this);
-    }
-  }
-
-  int get hashCode => JS('int', '# & 0x1FFFFFFF', this);
-
-  num operator -() => JS('num', r'-#', this);
-
-  num operator +(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('num', '# + #', this, other);
-  }
-
-  num operator -(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('num', '# - #', this, other);
-  }
-
-  num operator /(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('num', '# / #', this, other);
-  }
-
-  num operator *(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('num', '# * #', this, other);
-  }
-
-  num operator %(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    // Euclidean Modulo.
-    num result = JS('num', r'# % #', this, other);
-    if (result == 0) return 0;  // Make sure we don't return -0.0.
-    if (result > 0) return result;
-    if (JS('num', '#', other) < 0) {
-      return result - JS('num', '#', other);
-    } else {
-      return result + JS('num', '#', other);
-    }
-  }
-
-  bool _isInt32(value) => JS('bool', '(# | 0) === #', value, value);
-
-  num operator ~/(num other) {
-    if (false) _tdivFast(other); // Ensure resolution.
-    if (_isInt32(this) && _isInt32(other) && 0 != other && -1 != other) {
-      return JS('num', r'(# / #) | 0', this, other);
-    } else {
-      return _tdivSlow(other);
-    }
-  }
-
-  num _tdivFast(num other) {
-    return _isInt32(this)
-        ? JS('num', r'(# / #) | 0', this, other)
-        : (JS('num', r'# / #', this, other)).toInt();
-  }
-
-  num _tdivSlow(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return (JS('num', r'# / #', this, other)).toInt();
-  }
-
-  // TODO(ngeoffray): Move the bit operations below to [JSInt] and
-  // make them take an int. Because this will make operations slower,
-  // we define these methods on number for now but we need to decide
-  // the grain at which we do the type checks.
-
-  num operator <<(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    if (JS('num', '#', other) < 0) throw new ArgumentError(other);
-    return _shlPositive(other);
-  }
-
-  num _shlPositive(num other) {
-    // JavaScript only looks at the last 5 bits of the shift-amount. Shifting
-    // by 33 is hence equivalent to a shift by 1.
-    return JS('bool', r'# > 31', other)
-        ? 0
-        : JS('JSUInt32', r'(# << #) >>> 0', this, other);
-  }
-
-  num operator >>(num other) {
-    if (false) _shrReceiverPositive(other);
-    if (other is !num) throw new ArgumentError(other);
-    if (JS('num', '#', other) < 0) throw new ArgumentError(other);
-    return _shrOtherPositive(other);
-  }
-
-  num _shrOtherPositive(num other) {
-    return JS('num', '#', this) > 0
-        ? _shrBothPositive(other)
-        // For negative numbers we just clamp the shift-by amount.
-        // `this` could be negative but not have its 31st bit set.
-        // The ">>" would then shift in 0s instead of 1s. Therefore
-        // we cannot simply return 0xFFFFFFFF.
-        : JS('JSUInt32', r'(# >> #) >>> 0', this, other > 31 ? 31 : other);
-  }
-
-  num _shrReceiverPositive(num other) {
-    if (JS('num', '#', other) < 0) throw new ArgumentError(other);
-    return _shrBothPositive(other);
-  }
-
-  num _shrBothPositive(num other) {
-    return JS('bool', r'# > 31', other)
-        // JavaScript only looks at the last 5 bits of the shift-amount. In JS
-        // shifting by 33 is hence equivalent to a shift by 1. Shortcut the
-        // computation when that happens.
-        ? 0
-        // Given that `this` is positive we must not use '>>'. Otherwise a
-        // number that has the 31st bit set would be treated as negative and
-        // shift in ones.
-        : JS('JSUInt32', r'# >>> #', this, other);
-  }
-
-  num operator &(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('JSUInt32', r'(# & #) >>> 0', this, other);
-  }
-
-  num operator |(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('JSUInt32', r'(# | #) >>> 0', this, other);
-  }
-
-  num operator ^(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('JSUInt32', r'(# ^ #) >>> 0', this, other);
-  }
-
-  bool operator <(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('bool', '# < #', this, other);
-  }
-
-  bool operator >(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('bool', '# > #', this, other);
-  }
-
-  bool operator <=(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('bool', '# <= #', this, other);
-  }
-
-  bool operator >=(num other) {
-    if (other is !num) throw new ArgumentError(other);
-    return JS('bool', '# >= #', this, other);
-  }
-
-  Type get runtimeType => num;
-}
-
-/**
- * The interceptor class for [int]s.
- *
- * This class implements double since in JavaScript all numbers are doubles, so
- * while we want to treat `2.0` as an integer for some operations, its
- * interceptor should answer `true` to `is double`.
- */
-class JSInt extends JSNumber implements int, double {
-  const JSInt();
-
-  bool get isEven => (this & 1) == 0;
-
-  bool get isOdd => (this & 1) == 1;
-
-  int toUnsigned(int width) {
-    return this & ((1 << width) - 1);
-  }
-
-  int toSigned(int width) {
-    int signMask = 1 << (width - 1);
-    return (this & (signMask - 1)) - (this & signMask);
-  }
-
-  int get bitLength {
-    int nonneg = this < 0 ? -this - 1 : this;
-    if (nonneg >= 0x100000000) {
-      nonneg = nonneg ~/ 0x100000000;
-      return _bitCount(_spread(nonneg)) + 32;
-    }
-    return _bitCount(_spread(nonneg));
-  }
-
-  // Assumes i is <= 32-bit and unsigned.
-  static int _bitCount(int i) {
-    // See "Hacker's Delight", section 5-1, "Counting 1-Bits".
-
-    // The basic strategy is to use "divide and conquer" to
-    // add pairs (then quads, etc.) of bits together to obtain
-    // sub-counts.
-    //
-    // A straightforward approach would look like:
-    //
-    // i = (i & 0x55555555) + ((i >>  1) & 0x55555555);
-    // i = (i & 0x33333333) + ((i >>  2) & 0x33333333);
-    // i = (i & 0x0F0F0F0F) + ((i >>  4) & 0x0F0F0F0F);
-    // i = (i & 0x00FF00FF) + ((i >>  8) & 0x00FF00FF);
-    // i = (i & 0x0000FFFF) + ((i >> 16) & 0x0000FFFF);
-    //
-    // The code below removes unnecessary &'s and uses a
-    // trick to remove one instruction in the first line.
-
-    i = _shru(i, 0) - (_shru(i, 1) & 0x55555555);
-    i = (i & 0x33333333) + (_shru(i, 2) & 0x33333333);
-    i = 0x0F0F0F0F & (i + _shru(i, 4));
-    i += _shru(i, 8);
-    i += _shru(i, 16);
-    return (i & 0x0000003F);
-  }
-
-  static _shru(int value, int shift) => JS('int', '# >>> #', value, shift);
-  static _shrs(int value, int shift) => JS('int', '# >> #', value, shift);
-  static _ors(int a, int b) => JS('int', '# | #', a, b);
-
-  // Assumes i is <= 32-bit
-  static int _spread(int i) {
-    i = _ors(i, _shrs(i, 1));
-    i = _ors(i, _shrs(i, 2));
-    i = _ors(i, _shrs(i, 4));
-    i = _ors(i, _shrs(i, 8));
-    i = _shru(_ors(i, _shrs(i, 16)), 0);
-    return i;
-  }
-
-  Type get runtimeType => int;
-
-  int operator ~() => JS('JSUInt32', r'(~#) >>> 0', this);
-}
-
-class JSDouble extends JSNumber implements double {
-  const JSDouble();
-  Type get runtimeType => double;
-}
-
-class JSPositiveInt extends JSInt {}
-class JSUInt32 extends JSPositiveInt {}
-class JSUInt31 extends JSUInt32 {}