124 lines
3.1 KiB
PHP
124 lines
3.1 KiB
PHP
<?php
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/**
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* @filename StringReader.php
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* @author Jerry Yan <792602257@qq.com>
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* @date 2020/12/17 14:58
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*/
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namespace JerryYan\DSL\Reader;
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class StringReader extends ReaderInterface
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{
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protected $string;
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protected $currentToken;
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public function __construct(string $string)
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{
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$this->string = $string;
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$this->moveToNextToken();
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}
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/**
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* @inheritDoc
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*/
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public function getNextChar(int $startAt = null): string
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{
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if ($startAt === null) $startAt = $this->currentPosition;
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return mb_substr($this->string, $startAt, 1);
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}
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/**
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* @inheritDoc
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*/
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public function getCurrentToken(): string
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{
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return $this->currentToken;
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}
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/**
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* @inheritDoc
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*/
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public function getNextToken(): string
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{
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$curToken = "";
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$curPos = $this->nextPosition;
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while ($curChar = $this->getNextChar($curPos)) {
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switch ($curChar) {
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case " ":
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// 如果开始的时候就有空白，跳过它
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if (empty($curToken)) {
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continue 2;
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}
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// 否则就结束（已经匹配完成）
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break 2;
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case "\r":
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case "\n":
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break 2;
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default:
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$curToken .= $curChar;
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}
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}
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return $curToken;
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}
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/**
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* @inheritDoc
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*/
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public function moveToNextToken(): bool
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{
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$curToken = "";
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$this->currentPosition = $this->nextPosition;
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while ($curChar = $this->getNextChar($this->nextPosition)) {
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$this->nextPosition++;
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$this->currentLinePosition++;
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switch ($curChar) {
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case " ":
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// 如果开始的时候就有空白，跳过它
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if (empty($curToken)) {
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$this->currentPosition++;
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continue 2;
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}
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// 否则就结束（已经匹配完成）
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break 2;
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case "\r":
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if ($this->getNextChar($this->nextPosition+1) === "\n") {
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// CRLF换行
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$this->nextPosition+=2;
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}
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// CR换行
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$this->currentLine++;
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$this->currentLinePosition=0;
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break 2;
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case "\n":
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// LF换行
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$this->currentLine++;
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$this->currentLinePosition=0;
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break 2;
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default:
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$curToken .= $curChar;
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}
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}
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$this->currentToken = $curToken;
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return true;
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}
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/**
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* @inheritDoc
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*/
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public function skipCurrentLine(): bool
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{
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// TODO: Implement skipCurrentLine() method.
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return true;
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}
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/**
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* @inheritDoc
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*/
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public function skipUntil(string $end = "*/"): bool
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{
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// TODO: Implement skipUntil() method.
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return true;
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}
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} |