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<?php
/**
* @private
* @see less-3.13.1.js#Call.prototype
*/
class Less_Tree_Call extends Less_Tree {
public $name;
public $args;
public $calc;
public $index;
public $currentFileInfo;
public function __construct( $name, $args, $index, $currentFileInfo = null ) {
$this->name = $name;
$this->args = $args;
$this->calc = $name === 'calc';
$this->index = $index;
$this->currentFileInfo = $currentFileInfo;
}
public function accept( $visitor ) {
$this->args = $visitor->visitArray( $this->args );
}
/**
* @see less-2.5.3.js#functionCaller.prototype.call
*/
private function functionCaller( $function, array $arguments ) {
// This code is terrible and should be replaced as per this issue...
// https://github.com/less/less.js/issues/2477
$filtered = [];
foreach ( $arguments as $argument ) {
if ( $argument instanceof Less_Tree_Comment ) {
continue;
}
$filtered[] = $argument;
}
foreach ( $filtered as $index => $argument ) {
if ( $argument instanceof Less_Tree_Expression ) {
$filtered[$index] = $argument->mapToFunctionCallArgument();
}
}
return $function( ...$filtered );
}
/**
* @param Less_Environment $env
* @return void
*/
private function exitCalc( $env, $currentMathContext ) {
if ( $this->calc || $env->inCalc ) {
$env->exitCalc();
}
$env->mathOn = $currentMathContext;
}
//
// When evaluating a function call,
// we either find the function in Less_Functions,
// in which case we call it, passing the evaluated arguments,
// or we simply print it out as it literal CSS.
//
// The reason why we compile the arguments, is in the case one
// of them is a LESS variable that only PHP knows the value of,
// like: `saturate(@mycolor)`.
// The function should receive the value, not the variable.
// TODO less.js#3.13.1 provide better parity with upstream.
public function compile( $env ) {
/**
* Turn off math for calc(), and switch back on for evaluating nested functions
*/
$currentMathContext = $env->mathOn;
$env->mathOn = !$this->calc;
if ( $this->calc || $env->inCalc ) {
$env->enterCalc();
}
$args = [];
foreach ( $this->args as $a ) {
$args[] = $a->compile( $env );
}
$env->mathOn = $currentMathContext;
$nameLC = strtolower( $this->name );
switch ( $nameLC ) {
case '%':
$nameLC = '_percent';
break;
case 'get-unit':
$nameLC = 'getunit';
break;
case 'data-uri':
$nameLC = 'datauri';
break;
case 'svg-gradient':
$nameLC = 'svggradient';
break;
case 'image-size':
$nameLC = 'imagesize';
break;
case 'image-width':
$nameLC = 'imagewidth';
break;
case 'image-height':
$nameLC = 'imageheight';
break;
}
$result = null;
if ( $nameLC === 'default' ) {
$result = Less_Tree_DefaultFunc::compile();
} else {
$func = null;
$functions = new Less_Functions( $env, $this->currentFileInfo );
$funcBuiltin = [ $functions, $nameLC ];
// Avoid method_exists() as that considers private utility functions too
if ( is_callable( $funcBuiltin ) ) {
$func = $funcBuiltin;
} elseif ( isset( $env->functions[$nameLC] ) && is_callable( $env->functions[$nameLC] ) ) {
$func = $env->functions[$nameLC];
}
// If the function name isn't known to LESS, output it unchanged as CSS.
if ( $func ) {
try {
$result = $this->functionCaller( $func, $args );
$this->exitCalc( $env, $currentMathContext );
} catch ( Exception $e ) {
// Preserve original trace, especially from custom functions.
// https://github.com/wikimedia/less.php/issues/38
throw new Less_Exception_Compiler(
'error evaluating function `' . $this->name . '` ' . $e->getMessage()
. ' index: ' . $this->index,
$e
);
}
}
}
if ( $result !== null ) {
return $result;
}
$this->exitCalc( $env, $currentMathContext );
return new self( $this->name, $args, $this->index, $this->currentFileInfo );
}
/**
* @see Less_Tree::genCSS
*/
public function genCSS( $output ) {
$output->add( $this->name . '(', $this->currentFileInfo, $this->index );
$args_len = count( $this->args );
for ( $i = 0; $i < $args_len; $i++ ) {
$this->args[$i]->genCSS( $output );
if ( $i + 1 < $args_len ) {
$output->add( ', ' );
}
}
$output->add( ')' );
}
}
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