github.com/goplusjs/gopherjs@v1.2.6-0.20211206034512-f187917453b8/compiler/prelude/prelude.go

package prelude

//go:generate go run genmin.go

// Prelude is the GopherJS JavaScript interop layer.
const Prelude = prelude + numeric + types + goroutines + jsmapping

const prelude = `Error.stackTraceLimit = Infinity;

var $global, $module;
if (typeof window !== "undefined") { /* web page */
  $global = window;
} else if (typeof self !== "undefined") { /* web worker */
  $global = self;
} else if (typeof global !== "undefined") { /* Node.js */
  $global = global;
  $global.require = require;
} else { /* others (e.g. Nashorn) */
  $global = this;
}

if ($global === undefined || $global.Array === undefined) {
  throw new Error("no global object found");
}
if (typeof module !== "undefined") {
  $module = module;
}

var $packages = {}, $idCounter = 0;
var $keys = function(m) { return m ? Object.keys(m) : []; };
var $flushConsole = function() {};
var $throwRuntimeError; /* set by package "runtime" */
var $throwNilPointerError = function() { $throwRuntimeError("invalid memory address or nil pointer dereference"); };
var $call = function(fn, rcvr, args) { return fn.apply(rcvr, args); };
var $makeFunc = function(fn) { return function() { return $externalize(fn(this, new ($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments, []))), $emptyInterface); }; };
var $unused = function(v) {};

var $mapArray = function(array, f) {
  var newArray = new array.constructor(array.length);
  for (var i = 0; i < array.length; i++) {
    newArray[i] = f(array[i]);
  }
  return newArray;
};

var $methodVal = function(recv, name) {
  var vals = recv.$methodVals || {};
  recv.$methodVals = vals; /* noop for primitives */
  var f = vals[name];
  if (f !== undefined) {
    return f;
  }
  var method = recv[name];
  f = function() {
    $stackDepthOffset--;
    try {
      return method.apply(recv, arguments);
    } finally {
      $stackDepthOffset++;
    }
  };
  vals[name] = f;
  return f;
};

var $methodExpr = function(typ, name) {
  var method = typ.prototype[name];
  if (method.$expr === undefined) {
    method.$expr = function() {
      $stackDepthOffset--;
      try {
        if (typ.wrapped) {
          arguments[0] = new typ(arguments[0]);
        }
        return Function.call.apply(method, arguments);
      } finally {
        $stackDepthOffset++;
      }
    };
  }
  return method.$expr;
};

var $ifaceMethodExprs = {};
var $ifaceMethodExpr = function(name) {
  var expr = $ifaceMethodExprs["$" + name];
  if (expr === undefined) {
    expr = $ifaceMethodExprs["$" + name] = function() {
      $stackDepthOffset--;
      try {
        return Function.call.apply(arguments[0][name], arguments);
      } finally {
        $stackDepthOffset++;
      }
    };
  }
  return expr;
};

var $subslice = function(slice, low, high, max) {
  if (high === undefined) {
    high = slice.$length;
  }
  if (max === undefined) {
    max = slice.$capacity;
  }
  if (low < 0 || high < low || max < high || high > slice.$capacity || max > slice.$capacity) {
    $throwRuntimeError("slice bounds out of range");
  }
  if (slice === slice.constructor.nil) {
    return slice;
  }
  var s = new slice.constructor(slice.$array);
  s.$offset = slice.$offset + low;
  s.$length = high - low;
  s.$capacity = max - low;
  return s;
};

var $substring = function(str, low, high) {
  if (low < 0 || high < low || high > str.length) {
    $throwRuntimeError("slice bounds out of range");
  }
  return str.substring(low, high);
};

var $sliceToArray = function(slice) {
  if (slice.$array.constructor !== Array) {
    return slice.$array.subarray(slice.$offset, slice.$offset + slice.$length);
  }
  return slice.$array.slice(slice.$offset, slice.$offset + slice.$length);
};

var $decodeRune = function(str, pos) {
  var c0 = str.charCodeAt(pos);

  if (c0 < 0x80) {
    return [c0, 1];
  }

  if (c0 !== c0 || c0 < 0xC0) {
    return [0xFFFD, 1];
  }

  var c1 = str.charCodeAt(pos + 1);
  if (c1 !== c1 || c1 < 0x80 || 0xC0 <= c1) {
    return [0xFFFD, 1];
  }

  if (c0 < 0xE0) {
    var r = (c0 & 0x1F) << 6 | (c1 & 0x3F);
    if (r <= 0x7F) {
      return [0xFFFD, 1];
    }
    return [r, 2];
  }

  var c2 = str.charCodeAt(pos + 2);
  if (c2 !== c2 || c2 < 0x80 || 0xC0 <= c2) {
    return [0xFFFD, 1];
  }

  if (c0 < 0xF0) {
    var r = (c0 & 0x0F) << 12 | (c1 & 0x3F) << 6 | (c2 & 0x3F);
    if (r <= 0x7FF) {
      return [0xFFFD, 1];
    }
    if (0xD800 <= r && r <= 0xDFFF) {
      return [0xFFFD, 1];
    }
    return [r, 3];
  }

  var c3 = str.charCodeAt(pos + 3);
  if (c3 !== c3 || c3 < 0x80 || 0xC0 <= c3) {
    return [0xFFFD, 1];
  }

  if (c0 < 0xF8) {
    var r = (c0 & 0x07) << 18 | (c1 & 0x3F) << 12 | (c2 & 0x3F) << 6 | (c3 & 0x3F);
    if (r <= 0xFFFF || 0x10FFFF < r) {
      return [0xFFFD, 1];
    }
    return [r, 4];
  }

  return [0xFFFD, 1];
};

var $encodeRune = function(r) {
  if (r < 0 || r > 0x10FFFF || (0xD800 <= r && r <= 0xDFFF)) {
    r = 0xFFFD;
  }
  if (r <= 0x7F) {
    return String.fromCharCode(r);
  }
  if (r <= 0x7FF) {
    return String.fromCharCode(0xC0 | r >> 6, 0x80 | (r & 0x3F));
  }
  if (r <= 0xFFFF) {
    return String.fromCharCode(0xE0 | r >> 12, 0x80 | (r >> 6 & 0x3F), 0x80 | (r & 0x3F));
  }
  return String.fromCharCode(0xF0 | r >> 18, 0x80 | (r >> 12 & 0x3F), 0x80 | (r >> 6 & 0x3F), 0x80 | (r & 0x3F));
};

var $stringToBytes = function(str) {
  var array = new Uint8Array(str.length);
  for (var i = 0; i < str.length; i++) {
    array[i] = str.charCodeAt(i);
  }
  return array;
};

var $bytesToString = function(slice) {
  if (slice.$length === 0) {
    return "";
  }
  var str = "";
  for (var i = 0; i < slice.$length; i += 10000) {
    str += String.fromCharCode.apply(undefined, slice.$array.subarray(slice.$offset + i, slice.$offset + Math.min(slice.$length, i + 10000)));
  }
  return str;
};

var $stringToRunes = function(str) {
  var array = new Int32Array(str.length);
  var rune, j = 0;
  for (var i = 0; i < str.length; i += rune[1], j++) {
    rune = $decodeRune(str, i);
    array[j] = rune[0];
  }
  return array.subarray(0, j);
};

var $runesToString = function(slice) {
  if (slice.$length === 0) {
    return "";
  }
  var str = "";
  for (var i = 0; i < slice.$length; i++) {
    str += $encodeRune(slice.$array[slice.$offset + i]);
  }
  return str;
};

var $copyString = function(dst, src) {
  var n = Math.min(src.length, dst.$length);
  for (var i = 0; i < n; i++) {
    dst.$array[dst.$offset + i] = src.charCodeAt(i);
  }
  return n;
};

var $copySlice = function(dst, src) {
  var n = Math.min(src.$length, dst.$length);
  $copyArray(dst.$array, src.$array, dst.$offset, src.$offset, n, dst.constructor.elem);
  return n;
};

var $copyArray = function(dst, src, dstOffset, srcOffset, n, elem) {
  if (n === 0 || (dst === src && dstOffset === srcOffset)) {
    return;
  }

  if (src.subarray) {
    dst.set(src.subarray(srcOffset, srcOffset + n), dstOffset);
    return;
  }

  switch (elem.kind) {
  case $kindArray:
  case $kindStruct:
    if (dst === src && dstOffset > srcOffset) {
      for (var i = n - 1; i >= 0; i--) {
        elem.copy(dst[dstOffset + i], src[srcOffset + i]);
      }
      return;
    }
    for (var i = 0; i < n; i++) {
      elem.copy(dst[dstOffset + i], src[srcOffset + i]);
    }
    return;
  }

  if (dst === src && dstOffset > srcOffset) {
    for (var i = n - 1; i >= 0; i--) {
      dst[dstOffset + i] = src[srcOffset + i];
    }
    return;
  }
  for (var i = 0; i < n; i++) {
    dst[dstOffset + i] = src[srcOffset + i];
  }
};

var $clone = function(src, type) {
  var clone = type.zero();
  type.copy(clone, src);
  return clone;
};

var $pointerOfStructConversion = function(obj, type) {
  if(obj.$proxies === undefined) {
    obj.$proxies = {};
    obj.$proxies[obj.constructor.string] = obj;
  }
  var proxy = obj.$proxies[type.string];
  if (proxy === undefined) {
    var properties = {};
    for (var i = 0; i < type.elem.fields.length; i++) {
      (function(fieldProp) {
        properties[fieldProp] = {
          get: function() { return obj[fieldProp]; },
          set: function(value) { obj[fieldProp] = value; }
        };
      })(type.elem.fields[i].prop);
    }
    proxy = Object.create(type.prototype, properties);
    proxy.$val = proxy;
    obj.$proxies[type.string] = proxy;
    proxy.$proxies = obj.$proxies;
  }
  return proxy;
};

var $append = function(slice) {
  return $internalAppend(slice, arguments, 1, arguments.length - 1);
};

var $appendSlice = function(slice, toAppend) {
  if (toAppend.constructor === String) {
    var bytes = $stringToBytes(toAppend);
    return $internalAppend(slice, bytes, 0, bytes.length);
  }
  return $internalAppend(slice, toAppend.$array, toAppend.$offset, toAppend.$length);
};

var $internalAppend = function(slice, array, offset, length) {
  if (length === 0) {
    return slice;
  }

  var newArray = slice.$array;
  var newOffset = slice.$offset;
  var newLength = slice.$length + length;
  var newCapacity = slice.$capacity;

  if (newLength > newCapacity) {
    newOffset = 0;
    newCapacity = Math.max(newLength, slice.$capacity < 1024 ? slice.$capacity * 2 : Math.floor(slice.$capacity * 5 / 4));

    if (slice.$array.constructor === Array) {
      newArray = slice.$array.slice(slice.$offset, slice.$offset + slice.$length);
      newArray.length = newCapacity;
      var zero = slice.constructor.elem.zero;
      for (var i = slice.$length; i < newCapacity; i++) {
        newArray[i] = zero();
      }
    } else {
      newArray = new slice.$array.constructor(newCapacity);
      newArray.set(slice.$array.subarray(slice.$offset, slice.$offset + slice.$length));
    }
  }

  $copyArray(newArray, array, newOffset + slice.$length, offset, length, slice.constructor.elem);

  var newSlice = new slice.constructor(newArray);
  newSlice.$offset = newOffset;
  newSlice.$length = newLength;
  newSlice.$capacity = newCapacity;
  return newSlice;
};

var $equal = function(a, b, type) {
  if (type === $jsObjectPtr) {
    return a === b;
  }
  switch (type.kind) {
  case $kindComplex64:
  case $kindComplex128:
    return a.$real === b.$real && a.$imag === b.$imag;
  case $kindInt64:
  case $kindUint64:
    return a.$high === b.$high && a.$low === b.$low;
  case $kindArray:
    if (a.length !== b.length) {
      return false;
    }
    for (var i = 0; i < a.length; i++) {
      if (!$equal(a[i], b[i], type.elem)) {
        return false;
      }
    }
    return true;
  case $kindStruct:
    for (var i = 0; i < type.fields.length; i++) {
      var f = type.fields[i];
      if (!$equal(a[f.prop], b[f.prop], f.typ)) {
        return false;
      }
    }
    return true;
  case $kindInterface:
    return $interfaceIsEqual(a, b);
  default:
    return a === b;
  }
};

var $interfaceIsEqual = function(a, b) {
  if (a === $ifaceNil || b === $ifaceNil) {
    return a === b;
  }
  if (a.constructor !== b.constructor) {
    return false;
  }
  if (a.constructor === $jsObjectPtr) {
    return a.object === b.object;
  }
  if (!a.constructor.comparable) {
    $throwRuntimeError("comparing uncomparable type " + a.constructor.string);
  }
  return $equal(a.$val, b.$val, a.constructor);
};
`