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<?php
namespace PhpParser;
use PhpParser\Node\Expr;
use PhpParser\Node\Stmt;
abstract class PrettyPrinterAbstract
{
protected $precedenceMap = array(
// [precedence, associativity] where for the latter -1 is %left, 0 is %nonassoc and 1 is %right
'Expr_BinaryOp_Pow' => array( 0, 1),
'Expr_BitwiseNot' => array( 10, 1),
'Expr_PreInc' => array( 10, 1),
'Expr_PreDec' => array( 10, 1),
'Expr_PostInc' => array( 10, -1),
'Expr_PostDec' => array( 10, -1),
'Expr_UnaryPlus' => array( 10, 1),
'Expr_UnaryMinus' => array( 10, 1),
'Expr_Cast_Int' => array( 10, 1),
'Expr_Cast_Double' => array( 10, 1),
'Expr_Cast_String' => array( 10, 1),
'Expr_Cast_Array' => array( 10, 1),
'Expr_Cast_Object' => array( 10, 1),
'Expr_Cast_Bool' => array( 10, 1),
'Expr_Cast_Unset' => array( 10, 1),
'Expr_ErrorSuppress' => array( 10, 1),
'Expr_Instanceof' => array( 20, 0),
'Expr_BooleanNot' => array( 30, 1),
'Expr_BinaryOp_Mul' => array( 40, -1),
'Expr_BinaryOp_Div' => array( 40, -1),
'Expr_BinaryOp_Mod' => array( 40, -1),
'Expr_BinaryOp_Plus' => array( 50, -1),
'Expr_BinaryOp_Minus' => array( 50, -1),
'Expr_BinaryOp_Concat' => array( 50, -1),
'Expr_BinaryOp_ShiftLeft' => array( 60, -1),
'Expr_BinaryOp_ShiftRight' => array( 60, -1),
'Expr_BinaryOp_Smaller' => array( 70, 0),
'Expr_BinaryOp_SmallerOrEqual' => array( 70, 0),
'Expr_BinaryOp_Greater' => array( 70, 0),
'Expr_BinaryOp_GreaterOrEqual' => array( 70, 0),
'Expr_BinaryOp_Equal' => array( 80, 0),
'Expr_BinaryOp_NotEqual' => array( 80, 0),
'Expr_BinaryOp_Identical' => array( 80, 0),
'Expr_BinaryOp_NotIdentical' => array( 80, 0),
'Expr_BinaryOp_Spaceship' => array( 80, 0),
'Expr_BinaryOp_BitwiseAnd' => array( 90, -1),
'Expr_BinaryOp_BitwiseXor' => array(100, -1),
'Expr_BinaryOp_BitwiseOr' => array(110, -1),
'Expr_BinaryOp_BooleanAnd' => array(120, -1),
'Expr_BinaryOp_BooleanOr' => array(130, -1),
'Expr_BinaryOp_Coalesce' => array(140, 1),
'Expr_Ternary' => array(150, -1),
// parser uses %left for assignments, but they really behave as %right
'Expr_Assign' => array(160, 1),
'Expr_AssignRef' => array(160, 1),
'Expr_AssignOp_Plus' => array(160, 1),
'Expr_AssignOp_Minus' => array(160, 1),
'Expr_AssignOp_Mul' => array(160, 1),
'Expr_AssignOp_Div' => array(160, 1),
'Expr_AssignOp_Concat' => array(160, 1),
'Expr_AssignOp_Mod' => array(160, 1),
'Expr_AssignOp_BitwiseAnd' => array(160, 1),
'Expr_AssignOp_BitwiseOr' => array(160, 1),
'Expr_AssignOp_BitwiseXor' => array(160, 1),
'Expr_AssignOp_ShiftLeft' => array(160, 1),
'Expr_AssignOp_ShiftRight' => array(160, 1),
'Expr_AssignOp_Pow' => array(160, 1),
'Expr_YieldFrom' => array(165, 1),
'Expr_Print' => array(168, 1),
'Expr_BinaryOp_LogicalAnd' => array(170, -1),
'Expr_BinaryOp_LogicalXor' => array(180, -1),
'Expr_BinaryOp_LogicalOr' => array(190, -1),
'Expr_Include' => array(200, -1),
);
protected $noIndentToken;
protected $canUseSemicolonNamespaces;
public function __construct() {
$this->noIndentToken = '_NO_INDENT_' . mt_rand();
}
/**
* Pretty prints an array of statements.
*
* @param Node[] $stmts Array of statements
*
* @return string Pretty printed statements
*/
public function prettyPrint(array $stmts) {
$this->preprocessNodes($stmts);
return ltrim(str_replace("\n" . $this->noIndentToken, "\n", $this->pStmts($stmts, false)));
}
/**
* Pretty prints an expression.
*
* @param Expr $node Expression node
*
* @return string Pretty printed node
*/
public function prettyPrintExpr(Expr $node) {
return str_replace("\n" . $this->noIndentToken, "\n", $this->p($node));
}
/**
* Pretty prints a file of statements (includes the opening <?php tag if it is required).
*
* @param Node[] $stmts Array of statements
*
* @return string Pretty printed statements
*/
public function prettyPrintFile(array $stmts) {
$p = rtrim($this->prettyPrint($stmts));
$p = preg_replace('/^\?>\n?/', '', $p, -1, $count);
$p = preg_replace('/<\?php$/', '', $p);
if (!$count) {
$p = "<?php\n\n" . $p;
}
return $p;
}
/**
* Preprocesses the top-level nodes to initialize pretty printer state.
*
* @param Node[] $nodes Array of nodes
*/
protected function preprocessNodes(array $nodes) {
/* We can use semicolon-namespaces unless there is a global namespace declaration */
$this->canUseSemicolonNamespaces = true;
foreach ($nodes as $node) {
if ($node instanceof Stmt\Namespace_ && null === $node->name) {
$this->canUseSemicolonNamespaces = false;
}
}
}
/**
* Pretty prints an array of nodes (statements) and indents them optionally.
*
* @param Node[] $nodes Array of nodes
* @param bool $indent Whether to indent the printed nodes
*
* @return string Pretty printed statements
*/
protected function pStmts(array $nodes, $indent = true) {
$result = '';
foreach ($nodes as $node) {
$result .= "\n"
. $this->pComments($node->getAttribute('comments', array()))
. $this->p($node)
. ($node instanceof Expr ? ';' : '');
}
if ($indent) {
return preg_replace('~\n(?!$|' . $this->noIndentToken . ')~', "\n ", $result);
} else {
return $result;
}
}
/**
* Pretty prints a node.
*
* @param Node $node Node to be pretty printed
*
* @return string Pretty printed node
*/
protected function p(Node $node) {
return $this->{'p' . $node->getType()}($node);
}
protected function pInfixOp($type, Node $leftNode, $operatorString, Node $rightNode) {
list($precedence, $associativity) = $this->precedenceMap[$type];
return $this->pPrec($leftNode, $precedence, $associativity, -1)
. $operatorString
. $this->pPrec($rightNode, $precedence, $associativity, 1);
}
protected function pPrefixOp($type, $operatorString, Node $node) {
list($precedence, $associativity) = $this->precedenceMap[$type];
return $operatorString . $this->pPrec($node, $precedence, $associativity, 1);
}
protected function pPostfixOp($type, Node $node, $operatorString) {
list($precedence, $associativity) = $this->precedenceMap[$type];
return $this->pPrec($node, $precedence, $associativity, -1) . $operatorString;
}
/**
* Prints an expression node with the least amount of parentheses necessary to preserve the meaning.
*
* @param Node $node Node to pretty print
* @param int $parentPrecedence Precedence of the parent operator
* @param int $parentAssociativity Associativity of parent operator
* (-1 is left, 0 is nonassoc, 1 is right)
* @param int $childPosition Position of the node relative to the operator
* (-1 is left, 1 is right)
*
* @return string The pretty printed node
*/
protected function pPrec(Node $node, $parentPrecedence, $parentAssociativity, $childPosition) {
$type = $node->getType();
if (isset($this->precedenceMap[$type])) {
$childPrecedence = $this->precedenceMap[$type][0];
if ($childPrecedence > $parentPrecedence
|| ($parentPrecedence == $childPrecedence && $parentAssociativity != $childPosition)
) {
return '(' . $this->{'p' . $type}($node) . ')';
}
}
return $this->{'p' . $type}($node);
}
/**
* Pretty prints an array of nodes and implodes the printed values.
*
* @param Node[] $nodes Array of Nodes to be printed
* @param string $glue Character to implode with
*
* @return string Imploded pretty printed nodes
*/
protected function pImplode(array $nodes, $glue = '') {
$pNodes = array();
foreach ($nodes as $node) {
$pNodes[] = $this->p($node);
}
return implode($glue, $pNodes);
}
/**
* Pretty prints an array of nodes and implodes the printed values with commas.
*
* @param Node[] $nodes Array of Nodes to be printed
*
* @return string Comma separated pretty printed nodes
*/
protected function pCommaSeparated(array $nodes) {
return $this->pImplode($nodes, ', ');
}
/**
* Signals the pretty printer that a string shall not be indented.
*
* @param string $string Not to be indented string
*
* @return mixed String marked with $this->noIndentToken's.
*/
protected function pNoIndent($string) {
return str_replace("\n", "\n" . $this->noIndentToken, $string);
}
protected function pComments(array $comments) {
$result = '';
foreach ($comments as $comment) {
$result .= $comment->getReformattedText() . "\n";
}
return $result;
}
}