102 lines
2.5 KiB
PHP
102 lines
2.5 KiB
PHP
<?php
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namespace phprs\util;
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/**
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* 去除//注释的内容，但会跳过引号内的//
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* @author caoym
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*
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*/
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class AnnotationCleaner
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{
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static public function clean($text) {
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$o = new AnnotationCleaner();
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return $o->clean_($text);
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}
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//去掉注释
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private function clean_($text) {
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$this->dest = '';
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$this->tmp = $text;
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$state = 'stateNormal';
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while ($state){
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$state = $this->$state();
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}
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return $this->dest;
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}
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private function stateNormal(){
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$stateBegin = [
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'//'=>'stateAntSL', //单行注释
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'/*'=>'stateAntML',//多行注释
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'\''=>'stateStrSQ', //单引号
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'"'=>'stateStrDQ',//双引号
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];
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$count = strlen($this->tmp);
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for($i=0; $i<$count; $i++){
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foreach ($stateBegin as $k=>$v){
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if(substr($this->tmp, $i, strlen($k)) == $k){
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$this->dest .= substr($this->tmp, 0, $i);
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$this->tmp = substr($this->tmp, $i);
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return $v;
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}
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}
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}
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$this->dest .= $this->tmp;
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$this->tmp = '';
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return false;
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}
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/**
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* 单行注释
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*/
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private function stateAntSL(){
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$pos = strpos($this->tmp, "\n");
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if($pos){
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$this->tmp = substr($this->tmp, $pos);
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}else{
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$this->tmp = '';
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}
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return 'stateNormal';
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}
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/**
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* 双行注释
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*/
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private function stateAntML(){
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$pos = strpos($this->tmp, "*/");
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if($pos){
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$this->tmp = substr($this->tmp, $pos+2);
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}else{
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$this->tmp = '';
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}
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return 'stateNormal';
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}
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// 单引号
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private function stateStrSQ(){
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return $this->stateStr('\'');
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}
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// 双引号
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private function stateStrDQ(){
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return $this->stateStr('"');
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}
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private function stateStr($q){
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$count = strlen($this->tmp);
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for($i=1; $i<$count; $i++){
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if(substr($this->tmp, $i, 1) == $q){
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$this->dest .= substr($this->tmp, 0, $i+1);
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$this->tmp = substr($this->tmp, $i+1);
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return 'stateNormal';
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}else if(substr($this->tmp, $i, 1) == '\\'){//文本内转义
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$i++;
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continue;//跳过一个
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}
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}
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$this->dest .= $this->tmp;
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$this->tmp = '';
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return 'stateNormal';
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}
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private $tmp;
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private $dest;
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}
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