/**
foreach($arr as $key=>$value){
code;
}
=>
for( key in arr){
value = arr[ key ];
code ;
}
*/
private function transForeach(TokenPool $aTokenPool,Token $aObject)
{
// 定位迭代器
$aTokenIter = $aTokenPool->iterator() ;
if( !$nPos=$aTokenIter->search($aObject) )
{
Assert::wrong('提供的 $aObject 不再 $aTokenPool 中') ;
}
$aTokenIter->seek($nPos) ;
// 找条件开始的 ”(“
do{ $aTokenIter->next() ; }
while( $aToken=$aTokenIter->current() and $aToken->tokenType()!=Token::T_BRACE_ROUND_OPEN ) ;
if(!$aToken)
{
throw new ClassCompileException($aObject, "foreach 后没有 ( ") ;
}
$aBraceRoundOpenToken = $aToken ;
// 找 ( 到 as 之间的表达值
$arrExpressions = array() ;
for( $aTokenIter->next(); $aToken=$aTokenIter->current() and $aToken->tokenType()!=T_AS; $aTokenIter->next() )
{
$arrExpressions[] = $aToken ;
}
// 吐掉最后的空格
array_pop($arrExpressions);
$aAsToken = $aToken ;
// 吃掉as后的空格
$aTokenIter->next();
// as 到 闭合 ) 之间是否有 '=>'
$aDoubleArrowToken = null ;
$arrTokenListBeforeArrow = array();
$arrTokenListAfterArrow = array();
for( $aTokenIter->next() ;
$aToken = $aTokenIter->current() and $aToken !== $aBraceRoundOpenToken->theOther() ;
$aTokenIter->next() ){
if( $aToken->tokenType() === T_DOUBLE_ARROW ){
$aDoubleArrowToken = $aToken ;
}else if( null === $aDoubleArrowToken ){
$arrTokenListBeforeArrow [] = $aToken ;
}else{
$arrTokenListAfterArrow [] = $aToken ;
}
}
// 清理最后的空格
if( end($arrTokenListBeforeArrow) ->tokenType() === T_WHITESPACE ){
array_pop( $arrTokenListBeforeArrow );
}
if( end($arrTokenListAfterArrow) and end($arrTokenListAfterArrow)->tokenType() === T_WHITESPACE ){
array_pop( $arrTokenListAfterArrow );
}
// 寻找开始的 '{'
// 空体for循环
for(
$aTokenIter->next() ;
$aToken = $aTokenIter->current() and $aToken->tokenType() !== Token::T_BRACE_OPEN ;
$aTokenIter->next()
);
$aBraceOpenToken = $aToken ;
// 开始替换
// foreach 替换成 for
$aObject->setTargetCode('for') ;
// arrExpressions 替换成 key
reset($arrExpressions);
if( null === $aDoubleArrowToken ){
$aToken = new Token(T_WHITESPACE,T_WHITESPACE);
$aToken->setTargetCode(__FUNCTION__.'_key');
$aTokenPool->insertBefore( current($arrExpressions) , $aToken );
}else{
// insert key
foreach($arrTokenListBeforeArrow as $aToken){
$aTokenPool->insertBefore( current($arrExpressions) , $aToken );
}
// insert a space
$aSpaceToken = new Token(T_WHITESPACE,' ');
$aTokenPool->insertBefore( current($arrExpressions) , $aSpaceToken );
// remove arr
do{
$aTokenPool->remove(current($arrExpressions) );
next($arrExpressions) ;
}while( false !== current($arrExpressions) );
}
// as 替换成 in
$aAsToken->setTargetCode('in');
// in 后面是arr
// 直接插入到闭合圆括号之前
foreach($arrExpressions as $aToken){
$aCloneToken = clone $aToken ;
$this->generateTargetCode($aTokenPool , $aCloneToken );
$aTokenPool->insertBefore( $aBraceRoundOpenToken->theOther() , $aCloneToken );
}
// '=>' 删掉
if( null !== $aDoubleArrowToken ){
$aDoubleArrowToken->setTargetCode('');
}
// '{'之后是value
// 先换行
$aToken = new Token(T_WHITESPACE,"\n");
$arrValueInsert = array($aToken);
if( null === $aDoubleArrowToken ){
$arrValueInsert = array_merge( $arrValueInsert , $arrTokenListBeforeArrow );
}else{
$arrValueInsert = array_merge( $arrValueInsert , $arrTokenListAfterArrow );
}
// value 之后是 =arr[key];
// =
$aEqualToken = new Token(Token::T_EQUAL,'=');
$arrValueInsert [] = $aEqualToken ;
// arr
foreach($arrExpressions as $aToken){
$aCloneToken = clone $aToken ;
$arrValueInsert [] = $aToken ;
}
// [
$aBraceSquareOpenToken = new Token(Token::T_BRACE_SQUARE_OPEN,'[');
$arrValueInsert [] = $aBraceSquareOpenToken ;
// key
if( null === $aDoubleArrowToken ){
$aToken = new Token(T_WHITESPACE,T_WHITESPACE);
$aToken->setTargetCode(__FUNCTION__.'_key');
$arrValueInsert [] = $aToken ;
}else{
// insert key
foreach($arrTokenListBeforeArrow as $aToken){
$aCloneToken = clone $aToken ;
$this->generateTargetCode($aTokenPool , $aCloneToken );
$arrValueInsert [] = $aCloneToken ;
}
}
// ]
$aBraceSquareCloseToken = new Token(Token::T_BRACE_SQUARE_CLOSE,']');
$arrValueInsert [] = $aBraceSquareCloseToken ;
// ;
$aSemicolonToken = new Token(Token::T_SEMICOLON,Token::T_SEMICOLON);
$arrValueInsert [] = $aSemicolonToken ;
// insert
array_unshift($arrValueInsert , $aBraceOpenToken);
call_user_func_array(array($aTokenPool,'insertAfter'),$arrValueInsert) ;
}