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Parser.js
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Parser.js
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'use strict';
const Utf8Stream = require('../utils/Utf8Stream');
class JsonlParser extends Utf8Stream {
static make(options) {
return new JsonlParser(options);
}
static checkedParse(input, reviver, errorIndicator) {
try {
return JSON.parse(input, reviver);
} catch (error) {
if (typeof errorIndicator == 'function') return errorIndicator(error, input, reviver);
}
return errorIndicator;
}
constructor(options) {
super(Object.assign({}, options, {readableObjectMode: true}));
this._rest = '';
this._counter = 0;
this._reviver = options && options.reviver;
this._errorIndicator = options && options.errorIndicator;
if (options && options.checkErrors) {
this._processBuffer = this._checked_processBuffer;
this._flush = this._checked_flush;
}
if (options && 'errorIndicator' in options) {
this._processBuffer = this._suppressed_processBuffer;
this._flush = this._suppressed_flush;
}
}
_processBuffer(callback) {
const lines = this._buffer.split('\n');
this._rest += lines[0];
if (lines.length > 1) {
this._rest && this.push({key: this._counter++, value: JSON.parse(this._rest, this._reviver)});
this._rest = lines.pop();
for (let i = 1; i < lines.length; ++i) {
lines[i] && this.push({key: this._counter++, value: JSON.parse(lines[i], this._reviver)});
}
}
this._buffer = '';
callback(null);
}
_flush(callback) {
super._flush(error => {
if (error) return callback(error);
if (this._rest) {
this.push({key: this._counter++, value: JSON.parse(this._rest, this._reviver)});
this._rest = '';
}
callback(null);
});
}
_suppressed_processBuffer(callback) {
const lines = this._buffer.split('\n');
this._rest += lines[0];
if (lines.length > 1) {
if (this._rest) {
const value = JsonlParser.checkedParse(this._rest, this._reviver, this._errorIndicator);
value !== undefined && this.push({key: this._counter++, value});
}
this._rest = lines.pop();
for (let i = 1; i < lines.length; ++i) {
if (!lines[i]) continue;
const value = JsonlParser.checkedParse(lines[i], this._reviver, this._errorIndicator);
value !== undefined && this.push({key: this._counter++, value});
}
}
this._buffer = '';
callback(null);
}
_suppressed_flush(callback) {
super._flush(error => {
if (error) return callback(error);
if (this._rest) {
const value = JsonlParser.checkedParse(this._rest, this._reviver, this._errorIndicator);
value !== undefined && this.push({key: this._counter++, value});
this._rest = '';
}
callback(null);
});
}
_checked_processBuffer(callback) {
const lines = this._buffer.split('\n');
this._rest += lines[0];
if (lines.length > 1) {
try {
this._rest && this.push({key: this._counter++, value: JSON.parse(this._rest, this._reviver)});
this._rest = lines.pop();
for (let i = 1; i < lines.length; ++i) {
lines[i] && this.push({key: this._counter++, value: JSON.parse(lines[i], this._reviver)});
}
} catch (cbErr) {
this._buffer = '';
callback(cbErr);
return;
}
}
this._buffer = '';
callback(null);
}
_checked_flush(callback) {
super._flush(error => {
if (error) return callback(error);
if (this._rest) {
try {
this.push({key: this._counter++, value: JSON.parse(this._rest, this._reviver)});
} catch (cbErr) {
this._rest = '';
callback(cbErr);
return;
}
this._rest = '';
}
callback(null);
});
}
}
JsonlParser.parser = JsonlParser.make;
JsonlParser.make.Constructor = JsonlParser;
module.exports = JsonlParser;