@platformos/pos-cli
Version:
Manage your platformOS application
119 lines • 4.17 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class CharacterStream {
constructor(sourceText) {
this.getStartOfToken = () => this._start;
this.getCurrentPosition = () => this._pos;
this.eol = () => this._sourceText.length === this._pos;
this.sol = () => this._pos === 0;
this.peek = () => {
return this._sourceText.charAt(this._pos)
? this._sourceText.charAt(this._pos)
: null;
};
this.next = () => {
const char = this._sourceText.charAt(this._pos);
this._pos++;
return char;
};
this.eat = (pattern) => {
const isMatched = this._testNextCharacter(pattern);
if (isMatched) {
this._start = this._pos;
this._pos++;
return this._sourceText.charAt(this._pos - 1);
}
return undefined;
};
this.eatWhile = (match) => {
let isMatched = this._testNextCharacter(match);
let didEat = false;
if (isMatched) {
didEat = isMatched;
this._start = this._pos;
}
while (isMatched) {
this._pos++;
isMatched = this._testNextCharacter(match);
didEat = true;
}
return didEat;
};
this.eatSpace = () => this.eatWhile(/[\s\u00a0]/);
this.skipToEnd = () => {
this._pos = this._sourceText.length;
};
this.skipTo = (position) => {
this._pos = position;
};
this.match = (pattern, consume = true, caseFold = false) => {
let token = null;
let match = null;
if (typeof pattern === 'string') {
const regex = new RegExp(pattern, caseFold ? 'i' : 'g');
match = regex.test(this._sourceText.substr(this._pos, pattern.length));
token = pattern;
}
else if (pattern instanceof RegExp) {
match = this._sourceText.slice(this._pos).match(pattern);
token = match && match[0];
}
if (match != null) {
if (typeof pattern === 'string' ||
(match instanceof Array &&
this._sourceText.startsWith(match[0], this._pos))) {
if (consume) {
this._start = this._pos;
if (token && token.length) {
this._pos += token.length;
}
}
return match;
}
}
return false;
};
this.backUp = (num) => {
this._pos -= num;
};
this.column = () => this._pos;
this.indentation = () => {
const match = this._sourceText.match(/\s*/);
let indent = 0;
if (match && match.length === 0) {
const whitespaces = match[0];
let pos = 0;
while (whitespaces.length > pos) {
if (whitespaces.charCodeAt(pos) === 9) {
indent += 2;
}
else {
indent++;
}
pos++;
}
}
return indent;
};
this.current = () => this._sourceText.slice(this._start, this._pos);
this._start = 0;
this._pos = 0;
this._sourceText = sourceText;
}
_testNextCharacter(pattern) {
const character = this._sourceText.charAt(this._pos);
let isMatched = false;
if (typeof pattern === 'string') {
isMatched = character === pattern;
}
else {
isMatched =
pattern instanceof RegExp
? pattern.test(character)
: pattern(character);
}
return isMatched;
}
}
exports.default = CharacterStream;
//# sourceMappingURL=CharacterStream.js.map