@js-joda/core
Version:
a date and time library for javascript
90 lines (83 loc) • 2.72 kB
JavaScript
/**
* @copyright (c) 2016, Philipp Thürwächter & Pattrick Hüper
* @copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
* @license BSD-3-Clause (see LICENSE in the root directory of this source tree)
*/
/**
* @private
*/
export class CompositePrinterParser {
constructor(printerParsers, optional) {
this._printerParsers = printerParsers;
this._optional = optional;
}
/**
* Returns a copy of this printer-parser with the optional flag changed.
*
* @param {boolean} optional the optional flag to set in the copy
* @return {CompositePrinterParser} the new printer-parser, not null
*/
withOptional(optional) {
if (optional === this._optional) {
return this;
}
return new CompositePrinterParser(this._printerParsers, optional);
}
print(context, buf) {
const length = buf.length();
if (this._optional) {
context.startOptional();
}
try {
for (let i=0; i<this._printerParsers.length; i++) {
const pp = this._printerParsers[i];
if (pp.print(context, buf) === false) {
buf.setLength(length); // reset buffer
return true;
}
}
} finally {
if (this._optional) {
context.endOptional();
}
}
return true;
}
parse(context, text, position) {
if (this._optional) {
context.startOptional();
let pos = position;
for (let i=0; i<this._printerParsers.length; i++) {
const pp = this._printerParsers[i];
pos = pp.parse(context, text, pos);
if (pos < 0) {
context.endOptional(false);
return position; // return original position
}
}
context.endOptional(true);
return pos;
} else {
for (let i=0; i<this._printerParsers.length; i++) {
const pp = this._printerParsers[i];
position = pp.parse(context, text, position);
if (position < 0) {
break;
}
}
return position;
}
}
toString() {
let buf = '';
if (this._printerParsers != null) {
buf += this._optional ? '[' : '(';
for (let i=0; i<this._printerParsers.length; i++) {
const pp = this._printerParsers[i];
buf += pp.toString();
}
buf += this._optional ? ']' : ')';
}
return buf;
}
}