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57 lines
1.5 KiB
57 lines
1.5 KiB
<?php
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/** @license MIT
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* Copyright 2021 Dustin Wilson et al.
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* See LICENSE file for details */
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declare(strict_types=1);
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namespace MensBeam\Lit\Scope;
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/**
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* Tokenizes scope strings into an array of segments of the original string and
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* provides an interface for iterating through them.
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*/
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class Data {
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protected array $data;
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protected int $_position = -1;
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protected int $endPosition;
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public function __construct(string $data) {
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preg_match_all('/[BLR]:|\.|[A-Za-z0-9-+_\*]+|[\,\|\(\)&\^\$\>]/', $data, $matches, PREG_OFFSET_CAPTURE);
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$this->data = $matches[0] ?? [];
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$this->endPosition = count($this->data) - 1;
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}
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/** Moves the pointer up one position and returns the corresponding token */
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public function consume(): string|bool {
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if ($this->_position === $this->endPosition) {
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return false;
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}
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return $this->data[++$this->_position][0];
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}
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/** Returns the character offset of the current token */
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public function offset(): int|bool {
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if ($this->_position > $this->endPosition) {
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return false;
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}
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return $this->data[$this->_position][1];
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}
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/** Returns the next token without moving the pointer */
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public function peek(): string|bool {
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if ($this->_position === $this->endPosition) {
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return false;
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}
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return $this->data[$this->_position + 1][0];
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}
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public function __get(string $name) {
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if ($name === 'position') {
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return $this->_position;
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}
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}
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}
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