32 lines
1.1 KiB
JavaScript
32 lines
1.1 KiB
JavaScript
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/**
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* @license
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* Copyright (c) 2024 Handsoncode. All rights reserved.
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*/
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import { ALL_UNICODE_LETTERS_ARRAY, NAMED_EXPRESSION_PATTERN, R1C1_CELL_REFERENCE_PATTERN } from './parser-consts';
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/**
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* Helper class for recognizing NamedExpression token in text
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*/
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export class NamedExpressionMatcher {
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constructor() {
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this.POSSIBLE_START_CHARACTERS = [...ALL_UNICODE_LETTERS_ARRAY, '_'];
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this.namedExpressionRegexp = new RegExp(NAMED_EXPRESSION_PATTERN, 'y');
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this.r1c1CellRefRegexp = new RegExp(`^${R1C1_CELL_REFERENCE_PATTERN}$`);
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}
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/**
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* Method used by the lexer to recognize NamedExpression token in text
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*
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* Note: using 'y' sticky flag for a named expression which is not supported on IE11...
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* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/sticky
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*/
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match(text, startOffset) {
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this.namedExpressionRegexp.lastIndex = startOffset;
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const execResult = this.namedExpressionRegexp.exec(text);
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if (execResult == null || execResult[0] == null) {
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return null;
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}
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if (this.r1c1CellRefRegexp.test(execResult[0])) {
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return null;
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}
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return execResult;
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}
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}
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