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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/stream-json
Просмотр файла: Parser.js
'use strict';
const Utf8Stream = require('./utils/Utf8Stream');
const patterns = {
value1: /^(?:[\"\{\[\]\-\d]|true\b|false\b|null\b|\s{1,256})/,
string: /^(?:[^\x00-\x1f\"\\]{1,256}|\\[bfnrt\"\\\/]|\\u[\da-fA-F]{4}|\")/,
key1: /^(?:[\"\}]|\s{1,256})/,
colon: /^(?:\:|\s{1,256})/,
comma: /^(?:[\,\]\}]|\s{1,256})/,
ws: /^\s{1,256}/,
numberStart: /^\d/,
numberDigit: /^\d{0,256}/,
numberFraction: /^[\.eE]/,
numberExponent: /^[eE]/,
numberExpSign: /^[-+]/
};
const MAX_PATTERN_SIZE = 16;
let noSticky = true;
try {
new RegExp('.', 'y');
noSticky = false;
} catch (e) {
// suppress
}
!noSticky &&
Object.keys(patterns).forEach(key => {
let src = patterns[key].source.slice(1); // lop off ^
if (src.slice(0, 3) === '(?:' && src.slice(-1) === ')') {
src = src.slice(3, -1);
}
patterns[key] = new RegExp(src, 'y');
});
patterns.numberFracStart = patterns.numberExpStart = patterns.numberStart;
patterns.numberFracDigit = patterns.numberExpDigit = patterns.numberDigit;
const values = {true: true, false: false, null: null},
expected = {object: 'objectStop', array: 'arrayStop', '': 'done'};
// long hexadecimal codes: \uXXXX
const fromHex = s => String.fromCharCode(parseInt(s.slice(2), 16));
// short codes: \b \f \n \r \t \" \\ \/
const codes = {b: '\b', f: '\f', n: '\n', r: '\r', t: '\t', '"': '"', '\\': '\\', '/': '/'};
class Parser extends Utf8Stream {
static make(options) {
return new Parser(options);
}
constructor(options) {
super(Object.assign({}, options, {readableObjectMode: true}));
this._packKeys = this._packStrings = this._packNumbers = this._streamKeys = this._streamStrings = this._streamNumbers = true;
if (options) {
'packValues' in options && (this._packKeys = this._packStrings = this._packNumbers = options.packValues);
'packKeys' in options && (this._packKeys = options.packKeys);
'packStrings' in options && (this._packStrings = options.packStrings);
'packNumbers' in options && (this._packNumbers = options.packNumbers);
'streamValues' in options && (this._streamKeys = this._streamStrings = this._streamNumbers = options.streamValues);
'streamKeys' in options && (this._streamKeys = options.streamKeys);
'streamStrings' in options && (this._streamStrings = options.streamStrings);
'streamNumbers' in options && (this._streamNumbers = options.streamNumbers);
this._jsonStreaming = options.jsonStreaming;
}
!this._packKeys && (this._streamKeys = true);
!this._packStrings && (this._streamStrings = true);
!this._packNumbers && (this._streamNumbers = true);
this._done = false;
this._expect = this._jsonStreaming ? 'done' : 'value';
this._stack = [];
this._parent = '';
this._open_number = false;
this._accumulator = '';
}
_flush(callback) {
this._done = true;
super._flush(error => {
if (error) return callback(error);
if (this._open_number) {
if (this._streamNumbers) {
this.push({name: 'endNumber'});
}
this._open_number = false;
if (this._packNumbers) {
this.push({name: 'numberValue', value: this._accumulator});
this._accumulator = '';
}
}
callback(null);
});
}
_processBuffer(callback) {
let match,
value,
index = 0;
main: for (;;) {
switch (this._expect) {
case 'value1':
case 'value':
patterns.value1.lastIndex = index;
match = patterns.value1.exec(this._buffer);
if (!match) {
if (this._done || index + MAX_PATTERN_SIZE < this._buffer.length) {
if (index < this._buffer.length) return callback(new Error('Parser cannot parse input: expected a value'));
return callback(new Error('Parser has expected a value'));
}
break main; // wait for more input
}
value = match[0];
switch (value) {
case '"':
this._streamStrings && this.push({name: 'startString'});
this._expect = 'string';
break;
case '{':
this.push({name: 'startObject'});
this._stack.push(this._parent);
this._parent = 'object';
this._expect = 'key1';
break;
case '[':
this.push({name: 'startArray'});
this._stack.push(this._parent);
this._parent = 'array';
this._expect = 'value1';
break;
case ']':
if (this._expect !== 'value1') return callback(new Error("Parser cannot parse input: unexpected token ']'"));
if (this._open_number) {
this._streamNumbers && this.push({name: 'endNumber'});
this._open_number = false;
if (this._packNumbers) {
this.push({name: 'numberValue', value: this._accumulator});
this._accumulator = '';
}
}
this.push({name: 'endArray'});
this._parent = this._stack.pop();
this._expect = expected[this._parent];
break;
case '-':
this._open_number = true;
if (this._streamNumbers) {
this.push({name: 'startNumber'});
this.push({name: 'numberChunk', value: '-'});
}
this._packNumbers && (this._accumulator = '-');
this._expect = 'numberStart';
break;
case '0':
this._open_number = true;
if (this._streamNumbers) {
this.push({name: 'startNumber'});
this.push({name: 'numberChunk', value: '0'});
}
this._packNumbers && (this._accumulator = '0');
this._expect = 'numberFraction';
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
this._open_number = true;
if (this._streamNumbers) {
this.push({name: 'startNumber'});
this.push({name: 'numberChunk', value: value});
}
this._packNumbers && (this._accumulator = value);
this._expect = 'numberDigit';
break;
case 'true':
case 'false':
case 'null':
if (this._buffer.length - index === value.length && !this._done) break main; // wait for more input
this.push({name: value + 'Value', value: values[value]});
this._expect = expected[this._parent];
break;
// default: // ws
}
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'keyVal':
case 'string':
patterns.string.lastIndex = index;
match = patterns.string.exec(this._buffer);
if (!match) {
if (index < this._buffer.length && (this._done || this._buffer.length - index >= 6))
return callback(new Error('Parser cannot parse input: escaped characters'));
if (this._done) return callback(new Error('Parser has expected a string value'));
break main; // wait for more input
}
value = match[0];
if (value === '"') {
if (this._expect === 'keyVal') {
this._streamKeys && this.push({name: 'endKey'});
if (this._packKeys) {
this.push({name: 'keyValue', value: this._accumulator});
this._accumulator = '';
}
this._expect = 'colon';
} else {
this._streamStrings && this.push({name: 'endString'});
if (this._packStrings) {
this.push({name: 'stringValue', value: this._accumulator});
this._accumulator = '';
}
this._expect = expected[this._parent];
}
} else if (value.length > 1 && value.charAt(0) === '\\') {
const t = value.length == 2 ? codes[value.charAt(1)] : fromHex(value);
if (this._expect === 'keyVal' ? this._streamKeys : this._streamStrings) {
this.push({name: 'stringChunk', value: t});
}
if (this._expect === 'keyVal' ? this._packKeys : this._packStrings) {
this._accumulator += t;
}
} else {
if (this._expect === 'keyVal' ? this._streamKeys : this._streamStrings) {
this.push({name: 'stringChunk', value: value});
}
if (this._expect === 'keyVal' ? this._packKeys : this._packStrings) {
this._accumulator += value;
}
}
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'key1':
case 'key':
patterns.key1.lastIndex = index;
match = patterns.key1.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) return callback(new Error('Parser cannot parse input: expected an object key'));
break main; // wait for more input
}
value = match[0];
if (value === '"') {
this._streamKeys && this.push({name: 'startKey'});
this._expect = 'keyVal';
} else if (value === '}') {
if (this._expect !== 'key1') return callback(new Error("Parser cannot parse input: unexpected token '}'"));
this.push({name: 'endObject'});
this._parent = this._stack.pop();
this._expect = expected[this._parent];
}
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'colon':
patterns.colon.lastIndex = index;
match = patterns.colon.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) return callback(new Error("Parser cannot parse input: expected ':'"));
break main; // wait for more input
}
value = match[0];
value === ':' && (this._expect = 'value');
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'arrayStop':
case 'objectStop':
patterns.comma.lastIndex = index;
match = patterns.comma.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) return callback(new Error("Parser cannot parse input: expected ','"));
break main; // wait for more input
}
if (this._open_number) {
this._streamNumbers && this.push({name: 'endNumber'});
this._open_number = false;
if (this._packNumbers) {
this.push({name: 'numberValue', value: this._accumulator});
this._accumulator = '';
}
}
value = match[0];
if (value === ',') {
this._expect = this._expect === 'arrayStop' ? 'value' : 'key';
} else if (value === '}' || value === ']') {
if (value === '}' ? this._expect === 'arrayStop' : this._expect !== 'arrayStop') {
return callback(new Error("Parser cannot parse input: expected '" + (this._expect === 'arrayStop' ? ']' : '}') + "'"));
}
this.push({name: value === '}' ? 'endObject' : 'endArray'});
this._parent = this._stack.pop();
this._expect = expected[this._parent];
}
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
// number chunks
case 'numberStart': // [0-9]
patterns.numberStart.lastIndex = index;
match = patterns.numberStart.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) return callback(new Error('Parser cannot parse input: expected a starting digit'));
break main; // wait for more input
}
value = match[0];
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
this._expect = value === '0' ? 'numberFraction' : 'numberDigit';
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'numberDigit': // [0-9]*
patterns.numberDigit.lastIndex = index;
match = patterns.numberDigit.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) return callback(new Error('Parser cannot parse input: expected a digit'));
break main; // wait for more input
}
value = match[0];
if (value) {
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
} else {
if (index < this._buffer.length) {
this._expect = 'numberFraction';
break;
}
if (this._done) {
this._expect = expected[this._parent];
break;
}
break main; // wait for more input
}
break;
case 'numberFraction': // [\.eE]?
patterns.numberFraction.lastIndex = index;
match = patterns.numberFraction.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) {
this._expect = expected[this._parent];
break;
}
break main; // wait for more input
}
value = match[0];
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
this._expect = value === '.' ? 'numberFracStart' : 'numberExpSign';
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'numberFracStart': // [0-9]
patterns.numberFracStart.lastIndex = index;
match = patterns.numberFracStart.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) return callback(new Error('Parser cannot parse input: expected a fractional part of a number'));
break main; // wait for more input
}
value = match[0];
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
this._expect = 'numberFracDigit';
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'numberFracDigit': // [0-9]*
patterns.numberFracDigit.lastIndex = index;
match = patterns.numberFracDigit.exec(this._buffer);
value = match[0];
if (value) {
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
} else {
if (index < this._buffer.length) {
this._expect = 'numberExponent';
break;
}
if (this._done) {
this._expect = expected[this._parent];
break;
}
break main; // wait for more input
}
break;
case 'numberExponent': // [eE]?
patterns.numberExponent.lastIndex = index;
match = patterns.numberExponent.exec(this._buffer);
if (!match) {
if (index < this._buffer.length) {
this._expect = expected[this._parent];
break;
}
if (this._done) {
this._expect = 'done';
break;
}
break main; // wait for more input
}
value = match[0];
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
this._expect = 'numberExpSign';
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'numberExpSign': // [-+]?
patterns.numberExpSign.lastIndex = index;
match = patterns.numberExpSign.exec(this._buffer);
if (!match) {
if (index < this._buffer.length) {
this._expect = 'numberExpStart';
break;
}
if (this._done) return callback(new Error('Parser has expected an exponent value of a number'));
break main; // wait for more input
}
value = match[0];
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
this._expect = 'numberExpStart';
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'numberExpStart': // [0-9]
patterns.numberExpStart.lastIndex = index;
match = patterns.numberExpStart.exec(this._buffer);
if (!match) {
if (index < this._buffer.length || this._done) return callback(new Error('Parser cannot parse input: expected an exponent part of a number'));
break main; // wait for more input
}
value = match[0];
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
this._expect = 'numberExpDigit';
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
case 'numberExpDigit': // [0-9]*
patterns.numberExpDigit.lastIndex = index;
match = patterns.numberExpDigit.exec(this._buffer);
value = match[0];
if (value) {
this._streamNumbers && this.push({name: 'numberChunk', value: value});
this._packNumbers && (this._accumulator += value);
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
} else {
if (index < this._buffer.length || this._done) {
this._expect = expected[this._parent];
break;
}
break main; // wait for more input
}
break;
case 'done':
patterns.ws.lastIndex = index;
match = patterns.ws.exec(this._buffer);
if (!match) {
if (index < this._buffer.length) {
if (this._jsonStreaming) {
this._expect = 'value';
break;
}
return callback(new Error('Parser cannot parse input: unexpected characters'));
}
break main; // wait for more input
}
value = match[0];
if (this._open_number) {
this._streamNumbers && this.push({name: 'endNumber'});
this._open_number = false;
if (this._packNumbers) {
this.push({name: 'numberValue', value: this._accumulator});
this._accumulator = '';
}
}
if (noSticky) {
this._buffer = this._buffer.slice(value.length);
} else {
index += value.length;
}
break;
}
}
!noSticky && (this._buffer = this._buffer.slice(index));
callback(null);
}
}
Parser.parser = Parser.make;
Parser.make.Constructor = Parser;
module.exports = Parser;
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