diff options
Diffstat (limited to 'deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js')
-rw-r--r-- | deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js b/deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js new file mode 100644 index 0000000000..ebaf5c72aa --- /dev/null +++ b/deps/npm/node_modules/readable-stream/lib/internal/streams/buffer_list.js @@ -0,0 +1,189 @@ +'use strict'; + +function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; } + +function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; } + +var _require = require('buffer'), + Buffer = _require.Buffer; + +var _require2 = require('util'), + inspect = _require2.inspect; + +var custom = inspect && inspect.custom || 'inspect'; + +function copyBuffer(src, target, offset) { + Buffer.prototype.copy.call(src, target, offset); +} + +module.exports = +/*#__PURE__*/ +function () { + function BufferList() { + this.head = null; + this.tail = null; + this.length = 0; + } + + var _proto = BufferList.prototype; + + _proto.push = function push(v) { + var entry = { + data: v, + next: null + }; + if (this.length > 0) this.tail.next = entry;else this.head = entry; + this.tail = entry; + ++this.length; + }; + + _proto.unshift = function unshift(v) { + var entry = { + data: v, + next: this.head + }; + if (this.length === 0) this.tail = entry; + this.head = entry; + ++this.length; + }; + + _proto.shift = function shift() { + if (this.length === 0) return; + var ret = this.head.data; + if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next; + --this.length; + return ret; + }; + + _proto.clear = function clear() { + this.head = this.tail = null; + this.length = 0; + }; + + _proto.join = function join(s) { + if (this.length === 0) return ''; + var p = this.head; + var ret = '' + p.data; + + while (p = p.next) { + ret += s + p.data; + } + + return ret; + }; + + _proto.concat = function concat(n) { + if (this.length === 0) return Buffer.alloc(0); + var ret = Buffer.allocUnsafe(n >>> 0); + var p = this.head; + var i = 0; + + while (p) { + copyBuffer(p.data, ret, i); + i += p.data.length; + p = p.next; + } + + return ret; + } // Consumes a specified amount of bytes or characters from the buffered data. + ; + + _proto.consume = function consume(n, hasStrings) { + var ret; + + if (n < this.head.data.length) { + // `slice` is the same for buffers and strings. + ret = this.head.data.slice(0, n); + this.head.data = this.head.data.slice(n); + } else if (n === this.head.data.length) { + // First chunk is a perfect match. + ret = this.shift(); + } else { + // Result spans more than one buffer. + ret = hasStrings ? this._getString(n) : this._getBuffer(n); + } + + return ret; + }; + + _proto.first = function first() { + return this.head.data; + } // Consumes a specified amount of characters from the buffered data. + ; + + _proto._getString = function _getString(n) { + var p = this.head; + var c = 1; + var ret = p.data; + n -= ret.length; + + while (p = p.next) { + var str = p.data; + var nb = n > str.length ? str.length : n; + if (nb === str.length) ret += str;else ret += str.slice(0, n); + n -= nb; + + if (n === 0) { + if (nb === str.length) { + ++c; + if (p.next) this.head = p.next;else this.head = this.tail = null; + } else { + this.head = p; + p.data = str.slice(nb); + } + + break; + } + + ++c; + } + + this.length -= c; + return ret; + } // Consumes a specified amount of bytes from the buffered data. + ; + + _proto._getBuffer = function _getBuffer(n) { + var ret = Buffer.allocUnsafe(n); + var p = this.head; + var c = 1; + p.data.copy(ret); + n -= p.data.length; + + while (p = p.next) { + var buf = p.data; + var nb = n > buf.length ? buf.length : n; + buf.copy(ret, ret.length - n, 0, nb); + n -= nb; + + if (n === 0) { + if (nb === buf.length) { + ++c; + if (p.next) this.head = p.next;else this.head = this.tail = null; + } else { + this.head = p; + p.data = buf.slice(nb); + } + + break; + } + + ++c; + } + + this.length -= c; + return ret; + } // Make sure the linked list only shows the minimal necessary information. + ; + + _proto[custom] = function (_, options) { + return inspect(this, _objectSpread({}, options, { + // Only inspect one level. + depth: 0, + // It should not recurse. + customInspect: false + })); + }; + + return BufferList; +}();
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