<?php
class Sql_CompilerFlow {
/**
* compileControlFlow
* @desc redirects to different control flow functions
* @param string $name name of control flow function
* @param array $tree
* @param bool $recursing optional
*/
public static function doCompile($name, $tree, $recursing) {
return call_user_func(array(__CLASS__,"compile".$name),$tree, $recursing);
}
/**
* compileCASE
* @desc compiles nested case control flow sets
* => control flow function CASE
* @param array $tree
* @param bool $recursing
* @return string
*/
private function compileCASE($tree, $recursing=false){
if(isset($tree["Function"])) {
// if it is a nested function then recurse
$column = self::doCompile($tree["Function"]["Name"],$tree["Function"], true);
}
elseif(isset($tree["Name"]))
{
if(is_array($tree["Arg"])) {
$column = $tree["Name"] . " "; // function name
foreach($tree["Arg"] as $index => $value) {
switch($value["Type"])
{
case 'real_val':
case 'int_val':
case 'null':
case 'ident':
$column .= $value["Value"]." ";
break;
case 'flowcontrol':
$column .= strtoupper($value["Value"])." ";
break;
case 'text_val':
$column .= $value["Value"]." ";
break;
case 'Subclause':
$column .= Sql_Compiler::OPENBRACE
. $this->reCompile($value["Subclause"])
. Sql_Compiler::CLOSEBRACE." "
;
break;
}
}
$column .= "END ";
}
}
return $column;
}
/**
* compileIF
* @desc compiles nested if control flow sets
* => control flow function IF
* @param array $tree
* @param bool $recursing
* @return string
*/
private static function compileIF($tree, $recursing=false){
if(isset($tree["Function"])) {
// if it is a nested function then recurse
$column = self::doCompile($tree["Function"]["Name"],$tree["Function"], true);
}
elseif(isset($tree["Name"]))
{
if(is_array($tree["Arg"])) {
$column = $tree["Name"] . Sql_Compiler::OPENBRACE; // function name
$implosion = implode (Sql_Compiler::COMMA, $tree);
if(strstr(strtolower($implosion),'array')) { // check on error
$funcTree = array();
foreach($tree["Arg"] as $index => $value){
if(count($value)==1){
$valueNode = $value[0];
}
if(is_array($valueNode) && isset($valueNode["Function"]) && isset($valueNode["Function"]["Name"])) {
$funcTree[] = self::doCompile($valueNode["Function"]["Name"], $valueNode, true);
} else {
if(is_array($value)) {
$funcTree[] = implode("", $value);
} else {
$funcTree[] = $value;
}
}
}
$column .= implode(Sql_Compiler::COMMA, $funcTree);
} else {
$column .= $implosion;
}
$column .= Sql_Compiler::CLOSEBRACE;
}
// only top most function shall have an alias
if (empty($recursing) and $tree['Alias'] != '') {
$column .= Sql_Compiler::ALIAS . $tree['Alias'];
}
}
return $column;
}
public function compile($name, $tree, $recursing=false){
return self::doCompile($name,$tree, $recursing);
}
}
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