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apg-exp.js
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/******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/
/******/ // Check if module is in cache
/******/ if(installedModules[moduleId])
/******/ return installedModules[moduleId].exports;
/******/
/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ i: moduleId,
/******/ l: false,
/******/ exports: {}
/******/ };
/******/
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/ // Flag the module as loaded
/******/ module.l = true;
/******/
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/
/******/
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
/******/
/******/ // expose the module cache
/******/ __webpack_require__.c = installedModules;
/******/
/******/ // identity function for calling harmony imports with the correct context
/******/ __webpack_require__.i = function(value) { return value; };
/******/
/******/ // define getter function for harmony exports
/******/ __webpack_require__.d = function(exports, name, getter) {
/******/ if(!__webpack_require__.o(exports, name)) {
/******/ Object.defineProperty(exports, name, {
/******/ configurable: false,
/******/ enumerable: true,
/******/ get: getter
/******/ });
/******/ }
/******/ };
/******/
/******/ // getDefaultExport function for compatibility with non-harmony modules
/******/ __webpack_require__.n = function(module) {
/******/ var getter = module && module.__esModule ?
/******/ function getDefault() { return module['default']; } :
/******/ function getModuleExports() { return module; };
/******/ __webpack_require__.d(getter, 'a', getter);
/******/ return getter;
/******/ };
/******/
/******/ // Object.prototype.hasOwnProperty.call
/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
/******/
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = "";
/******/
/******/ // Load entry module and return exports
/******/ return __webpack_require__(__webpack_require__.s = 35);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
// This module serves to export all other objects and object constructors with the `require("apg-lib")` statement.
// For example, to create a new parser in your program,
//````
// var apglib = require("apg-lib");
// var my-parser = new apglib.parser();
//````
/*
* COPYRIGHT: Copyright (c) 2017 Lowell D. Thomas, all rights reserved
* LICENSE: BSD-3-Clause
* AUTHOR: Lowell D. Thomas
* EMAIL: [email protected]
* WEBSITE: http://coasttocoastresearch.com/
*/
exports.ast = __webpack_require__(36);
exports.circular = __webpack_require__(8);
exports.ids = __webpack_require__(1);
exports.parser = __webpack_require__(37);
exports.stats = __webpack_require__(38);
exports.trace = __webpack_require__(39);
exports.utils = __webpack_require__(2);
exports.emitcss = __webpack_require__(9);
exports.style = __webpack_require__(3);
/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
// This module exposes a list of named identifiers, shared across the parser generator
// and the parsers that are generated.
module.exports = {
// Identifies the operator type. Used by the [generator](https://github.com/ldthomas/apg-js2)
// to indicate operator types in the grammar object.
// Used by the [parser](./parser.html) when interpreting the grammar object.
/* the original ABNF operators */
ALT : 1, /* alternation */
CAT : 2, /* concatenation */
REP : 3, /* repetition */
RNM : 4, /* rule name */
TRG : 5, /* terminal range */
TBS : 6, /* terminal binary string, case sensitive */
TLS : 7, /* terminal literal string, case insensitive */
/* the super set, SABNF operators */
UDT : 11, /* user-defined terminal */
AND : 12, /* positive look ahead */
NOT : 13, /* negative look ahead */
BKR : 14, /* back reference to a previously matched rule name */
BKA : 15, /* positive look behind */
BKN : 16, /* negative look behind */
ABG : 17, /* anchor - begin of string */
AEN : 18, /* anchor - end of string */
// Used by the parser and the user's `RNM` and `UDT` callback functions.
// Identifies the parser state as it traverses the parse tree nodes.
// - *ACTIVE* - indicates the downward direction through the parse tree node.
// - *MATCH* - indicates the upward direction and a phrase, of length \> 0, has been successfully matched
// - *EMPTY* - indicates the upward direction and a phrase, of length = 0, has been successfully matched
// - *NOMATCH* - indicates the upward direction and the parser failed to match any phrase at all
ACTIVE : 100,
MATCH : 101,
EMPTY : 102,
NOMATCH : 103,
// Used by [`AST` translator](./ast.html) (semantic analysis) and the user's callback functions
// to indicate the direction of flow through the `AST` nodes.
// - *SEM_PRE* - indicates the downward (pre-branch) direction through the `AST` node.
// - *SEM_POST* - indicates the upward (post-branch) direction through the `AST` node.
SEM_PRE : 200,
SEM_POST : 201,
// Used by the user's callback functions to indicate to the `AST` translator (semantic analysis) how to proceed.
// - *SEM_OK* - normal return value
// - *SEM_SKIP* - if a callback function returns this value from the SEM_PRE state,
// the translator will skip processing all `AST` nodes in the branch below the current node.
// Ignored if returned from the SEM_POST state.
SEM_OK : 300,
SEM_SKIP : 301,
// Used in attribute generation to distinguish the necessary attribute categories.
// - *ATTR_N* - non-recursive
// - *ATTR_R* - recursive
// - *ATTR_MR* - belongs to a mutually-recursive set
// - *ATTR_NMR* - non-recursive, but refers to a mutually-recursive set
// - *ATTR_RMR* - recursive, but refers to a mutually-recursive set
ATTR_N : 400,
ATTR_R : 401,
ATTR_MR : 402,
ATTR_NMR : 403,
ATTR_RMR : 404,
// Look around values indicate whether the parser is in look ahead or look behind mode.
// Used by the tracing facility to indicate the look around mode in the trace records display.
// - *LOOKAROUND_NONE* - the parser is in normal parsing mode
// - *LOOKAROUND_AHEAD* - the parse is in look-ahead mode, phrase matching for operator `AND(&)` or `NOT(!)`
// - *LOOKAROUND_BEHIND* - the parse is in look-behind mode, phrase matching for operator `BKA(&&)` or `BKN(!!)`
LOOKAROUND_NONE : 500,
LOOKAROUND_AHEAD : 501,
LOOKAROUND_BEHIND : 502,
// Back reference rule mode indicators
// - *BKR_MODE_UM* - the back reference is using universal mode
// - *BKR_MODE_PM* - the back reference is using parent frame mode
// - *BKR_MODE_CS* - the back reference is using case-sensitive phrase matching
// - *BKR_MODE_CI* - the back reference is using case-insensitive phrase matching
BKR_MODE_UM : 601,
BKR_MODE_PM : 602,
BKR_MODE_CS : 603,
BKR_MODE_CI : 604
}
/***/ }),
/* 2 */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
// This module exports a variety of utility functions that support
// [`apg`](https://github.com/ldthomas/apg-js2), [`apg-lib`](https://github.com/ldthomas/apg-js2-lib)
// and the generated parser applications.
var thisFileName = "utilities.js: ";
var style = __webpack_require__(3);
var converter = __webpack_require__(5).converter;
var _this = this;
/* translate (implied) phrase beginning character and length to actual first and last character indexes */
/* used by multiple phrase handling functions */
var getBounds = function(length, beg, len) {
var end;
while (true) {
if (length <= 0) {
beg = 0;
end = 0;
break;
}
if (typeof (beg) !== "number") {
beg = 0;
end = length;
break;
}
if (beg >= length) {
beg = length;
end = length;
break;
}
if (typeof (len) !== "number") {
end = length;
break;
}
end = beg + len;
if (end > length) {
end = length;
break
}
break;
}
return {
beg : beg,
end : end
};
}
// Generates a complete, minimal HTML5 page, inserting the user's HTML text on the page.
// - *html* - the page text in HTML format
// - *title* - the HTML page `<title>` - defaults to `htmlToPage`.
exports.htmlToPage = function(html, title) {
var thisFileName = "utilities.js: ";
var emitcss = __webpack_require__(9);
if (typeof (html) !== "string") {
throw new Error(thisFileName + "htmlToPage: input HTML is not a string");
}
if (typeof (title) !== "string") {
title = "htmlToPage";
}
var page = '';
page += '<!DOCTYPE html>\n';
page += '<html lang="en">\n';
page += '<head>\n';
page += '<meta charset="utf-8">\n';
page += '<title>' + title + '</title>\n';
page += "<style>\n";
page += emitcss();
page += "</style>\n";
page += '</head>\n<body>\n';
page += '<p>' + new Date() + '</p>\n';
page += html;
page += '</body>\n</html>\n';
return page;
};
// Formats the returned object from [`parser.parse()`](./parse.html)
// into an HTML table.
// ```
// return {
// success : sysData.success,
// state : sysData.state,
// length : charsLength,
// matched : sysData.phraseLength,
// maxMatched : maxMatched,
// maxTreeDepth : maxTreeDepth,
// nodeHits : nodeHits,
// inputLength : chars.length,
// subBegin : charsBegin,
// subEnd : charsEnd,
// subLength : charsLength
// };
// ```
exports.parserResultToHtml = function(result, caption) {
var id = __webpack_require__(1);
var cap = null;
if (typeof (caption ) === "string" && caption !== "") {
cap = caption;
}
var success, state;
if (result.success === true) {
success = '<span class="' + style.CLASS_MATCH + '">true</span>';
} else {
success = '<span class="' + style.CLASS_NOMATCH + '">false</span>';
}
if (result.state === id.EMPTY) {
state = '<span class="' + style.CLASS_EMPTY + '">EMPTY</span>';
} else if (result.state === id.MATCH) {
state = '<span class="' + style.CLASS_MATCH + '">MATCH</span>';
} else if (result.state === id.NOMATCH) {
state = '<span class="' + style.CLASS_NOMATCH + '">NOMATCH</span>';
} else {
state = '<span class="' + style.CLASS_NOMATCH + '">unrecognized</span>';
}
var html = '';
html += '<table class="' + style.CLASS_STATE + '">\n';
if (cap) {
html += '<caption>' + cap + '</caption>\n';
}
html += '<tr><th>state item</th><th>value</th><th>description</th></tr>\n';
html += '<tr><td>parser success</td><td>' + success + '</td>\n';
html += '<td><span class="' + style.CLASS_MATCH + '">true</span> if the parse succeeded,\n';
html += ' <span class="' + style.CLASS_NOMATCH + '">false</span> otherwise';
html += '<br><i>NOTE: for success, entire string must be matched</i></td></tr>\n';
html += '<tr><td>parser state</td><td>' + state + '</td>\n';
html += '<td><span class="' + style.CLASS_EMPTY + '">EMPTY</span>, ';
html += '<span class="' + style.CLASS_MATCH + '">MATCH</span> or \n';
html += '<span class="' + style.CLASS_NOMATCH + '">NOMATCH</span></td></tr>\n';
html += '<tr><td>string length</td><td>' + result.length + '</td><td>length of the input (sub)string</td></tr>\n';
html += '<tr><td>matched length</td><td>' + result.matched + '</td><td>number of input string characters matched</td></tr>\n';
html += '<tr><td>max matched</td><td>' + result.maxMatched
+ '</td><td>maximum number of input string characters matched</td></tr>\n';
html += '<tr><td>max tree depth</td><td>' + result.maxTreeDepth
+ '</td><td>maximum depth of the parse tree reached</td></tr>\n';
html += '<tr><td>node hits</td><td>' + result.nodeHits
+ '</td><td>number of parse tree node hits (opcode function calls)</td></tr>\n';
html += '<tr><td>input length</td><td>' + result.inputLength + '</td><td>length of full input string</td></tr>\n';
html += '<tr><td>sub-string begin</td><td>' + result.subBegin + '</td><td>sub-string first character index</td></tr>\n';
html += '<tr><td>sub-string end</td><td>' + result.subEnd + '</td><td>sub-string end-of-string index</td></tr>\n';
html += '<tr><td>sub-string length</td><td>' + result.subLength + '</td><td>sub-string length</td></tr>\n';
html += '</table>\n';
return html;
}
// Translates a sub-array of integer character codes into a string.
// Very useful in callback functions to translate the matched phrases into strings.
exports.charsToString = function(chars, phraseIndex, phraseLength) {
var ar = chars.slice(phraseIndex, phraseIndex+phraseLength);
var buf = converter.encode("UTF16LE", ar);
return buf.toString("utf16le");
}
// Translates a string into an array of integer character codes.
exports.stringToChars = function(string) {
return converter.decode("STRING", string);
}
// Translates an opcode identifier into a human-readable string.
exports.opcodeToString = function(type) {
var id = __webpack_require__(1);
var ret = 'unknown';
switch (type) {
case id.ALT:
ret = 'ALT';
break;
case id.CAT:
ret = 'CAT';
break;
case id.RNM:
ret = 'RNM';
break;
case id.UDT:
ret = 'UDT';
break;
case id.AND:
ret = 'AND';
break;
case id.NOT:
ret = 'NOT';
break;
case id.REP:
ret = 'REP';
break;
case id.TRG:
ret = 'TRG';
break;
case id.TBS:
ret = 'TBS';
break;
case id.TLS:
ret = 'TLS';
break;
case id.BKR:
ret = 'BKR';
break;
case id.BKA:
ret = 'BKA';
break;
case id.BKN:
ret = 'BKN';
break;
case id.ABG:
ret = 'ABG';
break;
case id.AEN:
ret = 'AEN';
break;
}
return ret;
};
// Array which translates all 128, 7-bit ASCII character codes to their respective HTML format.
exports.asciiChars = [ "NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL", "BS", "TAB", "LF", "VT", "FF", "CR", "SO", "SI",
"DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB", "CAN", "EM", "SUB", "ESC", "FS", "GS", "RS", "US", ' ', "!",
'"', "#", "$", "%", '&', ''', "(", ")", "*", "+", ",", "-", ".", "/", "0", "1", "2", "3", "4", "5", "6", "7",
"8", "9", ":", ";", '<', "=", '>', "?", "@", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N",
"O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "[", "\", "]", "^", "_", "`", "a", "b", "c", "d", "e", "f",
"g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "{", "|", "}", "~",
"DEL" ];
// Translates a single character to hexidecimal with leading zeros for 2, 4, or 8 digit display.
exports.charToHex = function(char) {
var ch = char.toString(16).toUpperCase();
switch (ch.length) {
case 1:
case 3:
case 7:
ch = "0" + ch;
break;
case 6:
ch = "00" + ch;
break;
case 5:
ch = "000" + ch;
break;
}
return ch;
}
// Translates a sub-array of character codes to decimal display format.
exports.charsToDec = function(chars, beg, len) {
var ret = "";
if (!Array.isArray(chars)) {
throw new Error(thisFileName + "charsToDec: input must be an array of integers");
}
var bounds = getBounds(chars.length, beg, len);
if (bounds.end > bounds.beg) {
ret += chars[bounds.beg];
for (var i = bounds.beg + 1; i < bounds.end; i += 1) {
ret += "," + chars[i];
}
}
return ret;
}
// Translates a sub-array of character codes to hexidecimal display format.
exports.charsToHex = function(chars, beg, len) {
var ret = "";
if (!Array.isArray(chars)) {
throw new Error(thisFileName + "charsToHex: input must be an array of integers");
}
var bounds = getBounds(chars.length, beg, len);
if (bounds.end > bounds.beg) {
ret += "\\x" + _this.charToHex(chars[bounds.beg]);
for (var i = bounds.beg + 1; i < bounds.end; i += 1) {
ret += ",\\x" + _this.charToHex(chars[i]);
}
}
return ret;
}
// Translates a sub-array of character codes to Unicode display format.
exports.charsToUnicode = function(chars, beg, len) {
var ret = "";
if (!Array.isArray(chars)) {
throw new Error(thisFileName + "charsToUnicode: input must be an array of integers");
}
var bounds = getBounds(chars.length, beg, len);
if (bounds.end > bounds.beg) {
ret += "U+" + _this.charToHex(chars[bounds.beg]);
for (var i = bounds.beg + 1; i < bounds.end; i += 1) {
ret += ",U+" + _this.charToHex(chars[i]);
}
}
return ret;
}
// Translates a sub-array of character codes to JavaScript Unicode display format (`\uXXXX`).
exports.charsToJsUnicode = function(chars, beg, len) {
var ret = "";
if (!Array.isArray(chars)) {
throw new Error(thisFileName + "charsToJsUnicode: input must be an array of integers");
}
var bounds = getBounds(chars.length, beg, len);
if (bounds.end > bounds.beg) {
ret += "\\u" + _this.charToHex(chars[bounds.beg]);
for (var i = bounds.beg + 1; i < bounds.end; i += 1) {
ret += ",\\u" + _this.charToHex(chars[i]);
}
}
return ret;
}
// Translates a sub-array of character codes to printing ASCII character display format.
exports.charsToAscii = function(chars, beg, len) {
var ret = "";
if (!Array.isArray(chars)) {
throw new Error(thisFileName + "charsToAscii: input must be an array of integers");
}
var bounds = getBounds(chars.length, beg, len);
for (var i = bounds.beg; i < bounds.end; i += 1) {
var char = chars[i];
if (char >= 32 && char <= 126) {
ret += String.fromCharCode(char);
} else {
ret += "\\x" + _this.charToHex(char);
}
}
return ret;
}
// Translates a sub-array of character codes to HTML display format.
exports.charsToAsciiHtml = function(chars, beg, len) {
if (!Array.isArray(chars)) {
throw new Error(thisFileName + "charsToAsciiHtml: input must be an array of integers");
}
var html = "";
var char;
var bounds = getBounds(chars.length, beg, len);
for (var i = bounds.beg; i < bounds.end; i += 1) {
char = chars[i];
if (char < 32 || char === 127) {
/* control characters */
html += '<span class="' + style.CLASS_CTRLCHAR + '">' + _this.asciiChars[char] + '</span>';
} else if (char > 127) {
/* non-ASCII */
html += '<span class="' + style.CLASS_CTRLCHAR + '">' + 'U+' + _this.charToHex(char) + '</span>';
} else {
/* printing ASCII, 32 <= char <= 126 */
html += _this.asciiChars[char];
}
}
return html;
}
//Translates a JavaScript string to HTML display format.
exports.stringToAsciiHtml = function(str){
var chars = converter.decode("STRING", str);
// var chars = this.stringToChars(str);
return this.charsToAsciiHtml(chars);
}
/***/ }),
/* 3 */
/***/ (function(module, exports) {
module.exports = {
// Generated by apglib/style.js
CLASS_MONOSPACE: 'apg-mono',
CLASS_ACTIVE: 'apg-active',
CLASS_EMPTY: 'apg-empty',
CLASS_MATCH: 'apg-match',
CLASS_NOMATCH: 'apg-nomatch',
CLASS_LOOKAHEAD: 'apg-lh-match',
CLASS_LOOKBEHIND: 'apg-lb-match',
CLASS_REMAINDER: 'apg-remainder',
CLASS_CTRLCHAR: 'apg-ctrl-char',
CLASS_LINEEND: 'apg-line-end',
CLASS_ERROR: 'apg-error',
CLASS_PHRASE: 'apg-phrase',
CLASS_EMPTYPHRASE: 'apg-empty-phrase',
CLASS_STATE: 'apg-state',
CLASS_STATS: 'apg-stats',
CLASS_TRACE: 'apg-trace',
CLASS_GRAMMAR: 'apg-grammar',
CLASS_RULES: 'apg-rules',
CLASS_RULESLINK: 'apg-rules-link',
CLASS_ATTRIBUTES: 'apg-attrs',
}
/***/ }),
/* 4 */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
/* WEBPACK VAR INJECTION */(function(global) {/*!
* The buffer module from node.js, for the browser.
*
* @author Feross Aboukhadijeh <[email protected]> <http://feross.org>
* @license MIT
*/
/* eslint-disable no-proto */
var base64 = __webpack_require__(12)
var ieee754 = __webpack_require__(13)
var isArray = __webpack_require__(14)
exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50
/**
* If `Buffer.TYPED_ARRAY_SUPPORT`:
* === true Use Uint8Array implementation (fastest)
* === false Use Object implementation (most compatible, even IE6)
*
* Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
* Opera 11.6+, iOS 4.2+.
*
* Due to various browser bugs, sometimes the Object implementation will be used even
* when the browser supports typed arrays.
*
* Note:
*
* - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
* See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
*
* - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
*
* - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
* incorrect length in some situations.
* We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
* get the Object implementation, which is slower but behaves correctly.
*/
Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
? global.TYPED_ARRAY_SUPPORT
: typedArraySupport()
/*
* Export kMaxLength after typed array support is determined.
*/
exports.kMaxLength = kMaxLength()
function typedArraySupport () {
try {
var arr = new Uint8Array(1)
arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
return arr.foo() === 42 && // typed array instances can be augmented
typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
} catch (e) {
return false
}
}
function kMaxLength () {
return Buffer.TYPED_ARRAY_SUPPORT
? 0x7fffffff
: 0x3fffffff
}
function createBuffer (that, length) {
if (kMaxLength() < length) {
throw new RangeError('Invalid typed array length')
}
if (Buffer.TYPED_ARRAY_SUPPORT) {
// Return an augmented `Uint8Array` instance, for best performance
that = new Uint8Array(length)
that.__proto__ = Buffer.prototype
} else {
// Fallback: Return an object instance of the Buffer class
if (that === null) {
that = new Buffer(length)
}
that.length = length
}
return that
}
/**
* The Buffer constructor returns instances of `Uint8Array` that have their
* prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
* `Uint8Array`, so the returned instances will have all the node `Buffer` methods
* and the `Uint8Array` methods. Square bracket notation works as expected -- it
* returns a single octet.
*
* The `Uint8Array` prototype remains unmodified.
*/
function Buffer (arg, encodingOrOffset, length) {
if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
return new Buffer(arg, encodingOrOffset, length)
}
// Common case.
if (typeof arg === 'number') {
if (typeof encodingOrOffset === 'string') {
throw new Error(
'If encoding is specified then the first argument must be a string'
)
}
return allocUnsafe(this, arg)
}
return from(this, arg, encodingOrOffset, length)
}
Buffer.poolSize = 8192 // not used by this implementation
// TODO: Legacy, not needed anymore. Remove in next major version.
Buffer._augment = function (arr) {
arr.__proto__ = Buffer.prototype
return arr
}
function from (that, value, encodingOrOffset, length) {
if (typeof value === 'number') {
throw new TypeError('"value" argument must not be a number')
}
if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
return fromArrayBuffer(that, value, encodingOrOffset, length)
}
if (typeof value === 'string') {
return fromString(that, value, encodingOrOffset)
}
return fromObject(that, value)
}
/**
* Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
* if value is a number.
* Buffer.from(str[, encoding])
* Buffer.from(array)
* Buffer.from(buffer)
* Buffer.from(arrayBuffer[, byteOffset[, length]])
**/
Buffer.from = function (value, encodingOrOffset, length) {
return from(null, value, encodingOrOffset, length)
}
if (Buffer.TYPED_ARRAY_SUPPORT) {
Buffer.prototype.__proto__ = Uint8Array.prototype
Buffer.__proto__ = Uint8Array
if (typeof Symbol !== 'undefined' && Symbol.species &&
Buffer[Symbol.species] === Buffer) {
// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
Object.defineProperty(Buffer, Symbol.species, {
value: null,
configurable: true
})
}
}
function assertSize (size) {
if (typeof size !== 'number') {
throw new TypeError('"size" argument must be a number')
} else if (size < 0) {
throw new RangeError('"size" argument must not be negative')
}
}
function alloc (that, size, fill, encoding) {
assertSize(size)
if (size <= 0) {
return createBuffer(that, size)
}
if (fill !== undefined) {
// Only pay attention to encoding if it's a string. This
// prevents accidentally sending in a number that would
// be interpretted as a start offset.
return typeof encoding === 'string'
? createBuffer(that, size).fill(fill, encoding)
: createBuffer(that, size).fill(fill)
}
return createBuffer(that, size)
}
/**
* Creates a new filled Buffer instance.
* alloc(size[, fill[, encoding]])
**/
Buffer.alloc = function (size, fill, encoding) {
return alloc(null, size, fill, encoding)
}
function allocUnsafe (that, size) {
assertSize(size)
that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)
if (!Buffer.TYPED_ARRAY_SUPPORT) {
for (var i = 0; i < size; ++i) {
that[i] = 0
}
}
return that
}
/**
* Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
* */
Buffer.allocUnsafe = function (size) {
return allocUnsafe(null, size)
}
/**
* Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
*/
Buffer.allocUnsafeSlow = function (size) {
return allocUnsafe(null, size)
}
function fromString (that, string, encoding) {
if (typeof encoding !== 'string' || encoding === '') {
encoding = 'utf8'
}
if (!Buffer.isEncoding(encoding)) {
throw new TypeError('"encoding" must be a valid string encoding')
}
var length = byteLength(string, encoding) | 0
that = createBuffer(that, length)
var actual = that.write(string, encoding)
if (actual !== length) {
// Writing a hex string, for example, that contains invalid characters will
// cause everything after the first invalid character to be ignored. (e.g.
// 'abxxcd' will be treated as 'ab')
that = that.slice(0, actual)
}
return that
}
function fromArrayLike (that, array) {
var length = array.length < 0 ? 0 : checked(array.length) | 0
that = createBuffer(that, length)
for (var i = 0; i < length; i += 1) {
that[i] = array[i] & 255
}
return that
}
function fromArrayBuffer (that, array, byteOffset, length) {
array.byteLength // this throws if `array` is not a valid ArrayBuffer
if (byteOffset < 0 || array.byteLength < byteOffset) {
throw new RangeError('\'offset\' is out of bounds')
}
if (array.byteLength < byteOffset + (length || 0)) {
throw new RangeError('\'length\' is out of bounds')
}
if (byteOffset === undefined && length === undefined) {
array = new Uint8Array(array)
} else if (length === undefined) {
array = new Uint8Array(array, byteOffset)
} else {
array = new Uint8Array(array, byteOffset, length)
}
if (Buffer.TYPED_ARRAY_SUPPORT) {
// Return an augmented `Uint8Array` instance, for best performance
that = array
that.__proto__ = Buffer.prototype
} else {
// Fallback: Return an object instance of the Buffer class
that = fromArrayLike(that, array)
}
return that
}
function fromObject (that, obj) {
if (Buffer.isBuffer(obj)) {
var len = checked(obj.length) | 0
that = createBuffer(that, len)
if (that.length === 0) {
return that
}
obj.copy(that, 0, 0, len)
return that
}
if (obj) {
if ((typeof ArrayBuffer !== 'undefined' &&
obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
if (typeof obj.length !== 'number' || isnan(obj.length)) {
return createBuffer(that, 0)
}
return fromArrayLike(that, obj)
}
if (obj.type === 'Buffer' && isArray(obj.data)) {
return fromArrayLike(that, obj.data)
}
}
throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
}
function checked (length) {
// Note: cannot use `length < kMaxLength()` here because that fails when
// length is NaN (which is otherwise coerced to zero.)
if (length >= kMaxLength()) {
throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
'size: 0x' + kMaxLength().toString(16) + ' bytes')
}
return length | 0
}
function SlowBuffer (length) {
if (+length != length) { // eslint-disable-line eqeqeq
length = 0
}
return Buffer.alloc(+length)
}
Buffer.isBuffer = function isBuffer (b) {
return !!(b != null && b._isBuffer)
}
Buffer.compare = function compare (a, b) {
if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
throw new TypeError('Arguments must be Buffers')
}
if (a === b) return 0
var x = a.length
var y = b.length
for (var i = 0, len = Math.min(x, y); i < len; ++i) {
if (a[i] !== b[i]) {
x = a[i]
y = b[i]
break
}
}
if (x < y) return -1
if (y < x) return 1
return 0
}
Buffer.isEncoding = function isEncoding (encoding) {
switch (String(encoding).toLowerCase()) {
case 'hex':
case 'utf8':
case 'utf-8':
case 'ascii':
case 'latin1':
case 'binary':
case 'base64':
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return true
default:
return false
}
}
Buffer.concat = function concat (list, length) {
if (!isArray(list)) {
throw new TypeError('"list" argument must be an Array of Buffers')
}
if (list.length === 0) {
return Buffer.alloc(0)
}
var i
if (length === undefined) {
length = 0
for (i = 0; i < list.length; ++i) {
length += list[i].length
}
}
var buffer = Buffer.allocUnsafe(length)
var pos = 0
for (i = 0; i < list.length; ++i) {
var buf = list[i]
if (!Buffer.isBuffer(buf)) {
throw new TypeError('"list" argument must be an Array of Buffers')
}
buf.copy(buffer, pos)
pos += buf.length
}
return buffer
}
function byteLength (string, encoding) {
if (Buffer.isBuffer(string)) {
return string.length
}
if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
(ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
return string.byteLength
}
if (typeof string !== 'string') {
string = '' + string
}
var len = string.length
if (len === 0) return 0
// Use a for loop to avoid recursion
var loweredCase = false
for (;;) {
switch (encoding) {
case 'ascii':
case 'latin1':
case 'binary':
return len
case 'utf8':
case 'utf-8':
case undefined:
return utf8ToBytes(string).length
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return len * 2
case 'hex':
return len >>> 1
case 'base64':
return base64ToBytes(string).length
default:
if (loweredCase) return utf8ToBytes(string).length // assume utf8
encoding = ('' + encoding).toLowerCase()