mirror of
https://github.com/phabelio/PHP-Parser.git
synced 2024-11-27 04:24:43 +01:00
1192 lines
45 KiB
PHP
1192 lines
45 KiB
PHP
<?php declare(strict_types=1);
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namespace PhpParser;
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use PhpParser\Node\Expr;
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use PhpParser\Node\Scalar;
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use PhpParser\Node\Stmt;
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abstract class PrettyPrinterAbstract
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{
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const FIXUP_PREC_LEFT = 0; // LHS operand affected by precedence
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const FIXUP_PREC_RIGHT = 1; // RHS operand affected by precedence
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const FIXUP_CALL_LHS = 2; // LHS of call
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const FIXUP_DEREF_LHS = 3; // LHS of dereferencing operation
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const FIXUP_BRACED_NAME = 4; // Name operand that may require bracing
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const FIXUP_VAR_BRACED_NAME = 5; // Name operand that may require ${} bracing
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const FIXUP_ENCAPSED = 6; // Encapsed string part
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protected $precedenceMap = [
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// [precedence, associativity]
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// where for precedence -1 is %left, 0 is %nonassoc and 1 is %right
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'Expr_BinaryOp_Pow' => [ 0, 1],
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'Expr_BitwiseNot' => [ 10, 1],
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'Expr_PreInc' => [ 10, 1],
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'Expr_PreDec' => [ 10, 1],
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'Expr_PostInc' => [ 10, -1],
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'Expr_PostDec' => [ 10, -1],
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'Expr_UnaryPlus' => [ 10, 1],
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'Expr_UnaryMinus' => [ 10, 1],
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'Expr_Cast_Int' => [ 10, 1],
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'Expr_Cast_Double' => [ 10, 1],
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'Expr_Cast_String' => [ 10, 1],
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'Expr_Cast_Array' => [ 10, 1],
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'Expr_Cast_Object' => [ 10, 1],
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'Expr_Cast_Bool' => [ 10, 1],
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'Expr_Cast_Unset' => [ 10, 1],
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'Expr_ErrorSuppress' => [ 10, 1],
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'Expr_Instanceof' => [ 20, 0],
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'Expr_BooleanNot' => [ 30, 1],
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'Expr_BinaryOp_Mul' => [ 40, -1],
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'Expr_BinaryOp_Div' => [ 40, -1],
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'Expr_BinaryOp_Mod' => [ 40, -1],
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'Expr_BinaryOp_Plus' => [ 50, -1],
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'Expr_BinaryOp_Minus' => [ 50, -1],
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'Expr_BinaryOp_Concat' => [ 50, -1],
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'Expr_BinaryOp_ShiftLeft' => [ 60, -1],
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'Expr_BinaryOp_ShiftRight' => [ 60, -1],
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'Expr_BinaryOp_Smaller' => [ 70, 0],
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'Expr_BinaryOp_SmallerOrEqual' => [ 70, 0],
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'Expr_BinaryOp_Greater' => [ 70, 0],
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'Expr_BinaryOp_GreaterOrEqual' => [ 70, 0],
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'Expr_BinaryOp_Equal' => [ 80, 0],
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'Expr_BinaryOp_NotEqual' => [ 80, 0],
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'Expr_BinaryOp_Identical' => [ 80, 0],
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'Expr_BinaryOp_NotIdentical' => [ 80, 0],
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'Expr_BinaryOp_Spaceship' => [ 80, 0],
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'Expr_BinaryOp_BitwiseAnd' => [ 90, -1],
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'Expr_BinaryOp_BitwiseXor' => [100, -1],
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'Expr_BinaryOp_BitwiseOr' => [110, -1],
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'Expr_BinaryOp_BooleanAnd' => [120, -1],
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'Expr_BinaryOp_BooleanOr' => [130, -1],
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'Expr_BinaryOp_Coalesce' => [140, 1],
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'Expr_Ternary' => [150, -1],
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// parser uses %left for assignments, but they really behave as %right
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'Expr_Assign' => [160, 1],
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'Expr_AssignRef' => [160, 1],
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'Expr_AssignOp_Plus' => [160, 1],
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'Expr_AssignOp_Minus' => [160, 1],
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'Expr_AssignOp_Mul' => [160, 1],
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'Expr_AssignOp_Div' => [160, 1],
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'Expr_AssignOp_Concat' => [160, 1],
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'Expr_AssignOp_Mod' => [160, 1],
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'Expr_AssignOp_BitwiseAnd' => [160, 1],
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'Expr_AssignOp_BitwiseOr' => [160, 1],
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'Expr_AssignOp_BitwiseXor' => [160, 1],
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'Expr_AssignOp_ShiftLeft' => [160, 1],
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'Expr_AssignOp_ShiftRight' => [160, 1],
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'Expr_AssignOp_Pow' => [160, 1],
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'Expr_YieldFrom' => [165, 1],
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'Expr_Print' => [168, 1],
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'Expr_BinaryOp_LogicalAnd' => [170, -1],
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'Expr_BinaryOp_LogicalXor' => [180, -1],
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'Expr_BinaryOp_LogicalOr' => [190, -1],
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'Expr_Include' => [200, -1],
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];
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/** @var string Token placed before newline to ensure it is not indented. */
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protected $noIndentToken;
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/** @var string Token placed at end of doc string to ensure it is followed by a newline. */
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protected $docStringEndToken;
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/** @var bool Whether semicolon namespaces can be used (i.e. no global namespace is used) */
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protected $canUseSemicolonNamespaces;
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/** @var array Pretty printer options */
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protected $options;
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/** @var array Original tokens for use in format-preserving pretty print */
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protected $origTokens;
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/** @var int Current indentation level during format-preserving pretty pting */
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protected $indentLevel;
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/** @var bool[] Map determining whether a certain character is a label character */
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protected $labelCharMap;
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/**
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* @var int[][] Map from token types and subnode names to FIXUP_* constants. This is used
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* during format-preserving prints to place additional parens/braces if necessary.
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*/
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protected $fixupMap;
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/**
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* @var int[][] Map from "{$node->getType()}->{$subNode}" to ['left' => $l, 'right' => $r],
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* where $l and $r specify the token type that needs to be stripped when removing
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* this node.
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*/
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protected $removalMap;
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protected $insertionMap;
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/**
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* Creates a pretty printer instance using the given options.
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*
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* Supported options:
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* * bool $shortArraySyntax = false: Whether to use [] instead of array() as the default array
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* syntax, if the node does not specify a format.
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*
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* @param array $options Dictionary of formatting options
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*/
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public function __construct(array $options = []) {
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$this->noIndentToken = '_NO_INDENT_' . mt_rand();
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$this->docStringEndToken = '_DOC_STRING_END_' . mt_rand();
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$defaultOptions = ['shortArraySyntax' => false];
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$this->options = $options + $defaultOptions;
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}
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/**
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* Pretty prints an array of statements.
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*
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* @param Node[] $stmts Array of statements
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*
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* @return string Pretty printed statements
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*/
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public function prettyPrint(array $stmts) : string {
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$this->preprocessNodes($stmts);
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return ltrim($this->handleMagicTokens($this->pStmts($stmts, false)));
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}
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/**
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* Pretty prints an expression.
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*
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* @param Expr $node Expression node
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*
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* @return string Pretty printed node
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*/
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public function prettyPrintExpr(Expr $node) : string {
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return $this->handleMagicTokens($this->p($node));
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}
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/**
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* Pretty prints a file of statements (includes the opening <?php tag if it is required).
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*
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* @param Node[] $stmts Array of statements
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*
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* @return string Pretty printed statements
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*/
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public function prettyPrintFile(array $stmts) : string {
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if (!$stmts) {
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return "<?php\n\n";
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}
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$p = "<?php\n\n" . $this->prettyPrint($stmts);
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if ($stmts[0] instanceof Stmt\InlineHTML) {
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$p = preg_replace('/^<\?php\s+\?>\n?/', '', $p);
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}
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if ($stmts[count($stmts) - 1] instanceof Stmt\InlineHTML) {
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$p = preg_replace('/<\?php$/', '', rtrim($p));
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}
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return $p;
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}
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/**
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* Preprocesses the top-level nodes to initialize pretty printer state.
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*
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* @param Node[] $nodes Array of nodes
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*/
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protected function preprocessNodes(array $nodes) {
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/* We can use semicolon-namespaces unless there is a global namespace declaration */
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$this->canUseSemicolonNamespaces = true;
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foreach ($nodes as $node) {
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if ($node instanceof Stmt\Namespace_ && null === $node->name) {
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$this->canUseSemicolonNamespaces = false;
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}
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}
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}
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/**
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* Handles (and removes) no-indent and doc-string-end tokens.
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*
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* @param string $str
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* @return string
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*/
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protected function handleMagicTokens(string $str) : string {
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// Drop no-indent tokens
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$str = str_replace($this->noIndentToken, '', $str);
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// Replace doc-string-end tokens with nothing or a newline
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$str = str_replace($this->docStringEndToken . ";\n", ";\n", $str);
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$str = str_replace($this->docStringEndToken, "\n", $str);
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return $str;
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}
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/**
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* Pretty prints an array of nodes (statements) and indents them optionally.
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*
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* @param Node[] $nodes Array of nodes
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* @param bool $indent Whether to indent the printed nodes
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*
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* @return string Pretty printed statements
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*/
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protected function pStmts(array $nodes, bool $indent = true) : string {
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$result = '';
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foreach ($nodes as $node) {
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$comments = $node->getAttribute('comments', []);
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if ($comments) {
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$result .= "\n" . $this->pComments($comments);
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if ($node instanceof Stmt\Nop) {
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continue;
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}
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}
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$result .= "\n" . $this->p($node);
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}
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if ($indent) {
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return preg_replace('~\n(?!$|' . $this->noIndentToken . ')~', "\n ", $result);
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} else {
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return $result;
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}
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}
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/**
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* Pretty-print an infix operation while taking precedence into account.
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*
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* @param string $type Node type of operator
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* @param Node $leftNode Left-hand side node
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* @param string $operatorString String representation of the operator
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* @param Node $rightNode Right-hand side node
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*
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* @return string Pretty printed infix operation
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*/
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protected function pInfixOp(string $type, Node $leftNode, string $operatorString, Node $rightNode) : string {
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list($precedence, $associativity) = $this->precedenceMap[$type];
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return $this->pPrec($leftNode, $precedence, $associativity, -1)
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. $operatorString
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. $this->pPrec($rightNode, $precedence, $associativity, 1);
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}
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/**
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* Pretty-print a prefix operation while taking precedence into account.
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*
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* @param string $type Node type of operator
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* @param string $operatorString String representation of the operator
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* @param Node $node Node
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*
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* @return string Pretty printed prefix operation
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*/
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protected function pPrefixOp(string $type, string $operatorString, Node $node) : string {
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list($precedence, $associativity) = $this->precedenceMap[$type];
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return $operatorString . $this->pPrec($node, $precedence, $associativity, 1);
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}
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/**
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* Pretty-print a postfix operation while taking precedence into account.
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*
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* @param string $type Node type of operator
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* @param string $operatorString String representation of the operator
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* @param Node $node Node
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*
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* @return string Pretty printed postfix operation
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*/
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protected function pPostfixOp(string $type, Node $node, string $operatorString) : string {
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list($precedence, $associativity) = $this->precedenceMap[$type];
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return $this->pPrec($node, $precedence, $associativity, -1) . $operatorString;
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}
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/**
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* Prints an expression node with the least amount of parentheses necessary to preserve the meaning.
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*
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* @param Node $node Node to pretty print
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* @param int $parentPrecedence Precedence of the parent operator
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* @param int $parentAssociativity Associativity of parent operator
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* (-1 is left, 0 is nonassoc, 1 is right)
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* @param int $childPosition Position of the node relative to the operator
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* (-1 is left, 1 is right)
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*
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* @return string The pretty printed node
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*/
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protected function pPrec(Node $node, int $parentPrecedence, int $parentAssociativity, int $childPosition) : string {
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$type = $node->getType();
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if (isset($this->precedenceMap[$type])) {
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$childPrecedence = $this->precedenceMap[$type][0];
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if ($childPrecedence > $parentPrecedence
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|| ($parentPrecedence === $childPrecedence && $parentAssociativity !== $childPosition)
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) {
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return '(' . $this->p($node) . ')';
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}
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}
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return $this->p($node);
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}
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/**
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* Pretty prints an array of nodes and implodes the printed values.
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*
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* @param Node[] $nodes Array of Nodes to be printed
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* @param string $glue Character to implode with
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*
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* @return string Imploded pretty printed nodes
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*/
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protected function pImplode(array $nodes, string $glue = '') : string {
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$pNodes = [];
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foreach ($nodes as $node) {
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if (null === $node) {
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$pNodes[] = '';
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} else {
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$pNodes[] = $this->p($node);
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}
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}
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return implode($glue, $pNodes);
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}
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/**
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* Pretty prints an array of nodes and implodes the printed values with commas.
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*
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* @param Node[] $nodes Array of Nodes to be printed
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*
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* @return string Comma separated pretty printed nodes
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*/
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protected function pCommaSeparated(array $nodes) : string {
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return $this->pImplode($nodes, ', ');
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}
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/**
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* Pretty prints a comma-separated list of nodes in multiline style, including comments.
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*
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* The result includes a leading newline and one level of indentation (same as pStmts).
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*
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* @param Node[] $nodes Array of Nodes to be printed
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* @param bool $trailingComma Whether to use a trailing comma
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*
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* @return string Comma separated pretty printed nodes in multiline style
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*/
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protected function pCommaSeparatedMultiline(array $nodes, bool $trailingComma) : string {
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$result = '';
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$lastIdx = count($nodes) - 1;
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foreach ($nodes as $idx => $node) {
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if ($node !== null) {
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$comments = $node->getAttribute('comments', []);
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if ($comments) {
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$result .= "\n" . $this->pComments($comments);
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}
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$result .= "\n" . $this->p($node);
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} else {
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$result .= "\n";
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}
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if ($trailingComma || $idx !== $lastIdx) {
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$result .= ',';
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}
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}
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return preg_replace('~\n(?!$|' . $this->noIndentToken . ')~', "\n ", $result);
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}
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/**
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* Signals the pretty printer that a string shall not be indented.
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*
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* @param string $string Not to be indented string
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*
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* @return string String marked with $this->noIndentToken's.
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*/
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protected function pNoIndent(string $string) : string {
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return str_replace("\n", "\n" . $this->noIndentToken, $string);
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}
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/**
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* Prints reformatted text of the passed comments.
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*
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* @param Comment[] $comments List of comments
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*
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* @return string Reformatted text of comments
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*/
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protected function pComments(array $comments) : string {
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$formattedComments = [];
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foreach ($comments as $comment) {
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$formattedComments[] = $comment->getReformattedText();
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}
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return implode("\n", $formattedComments);
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}
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/**
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* Perform a format-preserving pretty print of an AST.
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*
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* The format preservation is best effort. For some changes to the AST the formatting will not
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* be preserved (at least not locally).
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*
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* In order to use this method a number of prerequisites must be satisfied:
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* * The startTokenPos and endTokenPos attributes in the lexer must be enabled.
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* * The CloningVisitor must be run on the AST prior to modification.
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* * The original tokens must be provided, using the getTokens() method on the lexer.
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*
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* @param Node[] $stmts Modified AST with links to original AST
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* @param Node[] $origStmts Original AST with token offset information
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* @param array $origTokens Tokens of the original code
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*
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* @return string
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*/
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public function printFormatPreserving(array $stmts, array $origStmts, array $origTokens) : string {
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$this->initializeLabelCharMap();
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$this->initializeFixupMap();
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$this->initializeRemovalMap();
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$this->initializeInsertionMap();
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$this->origTokens = $origTokens;
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$this->indentLevel = 0;
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$this->preprocessNodes($stmts);
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$pos = 0;
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$result = $this->pArray($stmts, $origStmts, $pos, 0, null);
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if (null !== $result) {
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$result .= $this->getTokenCode($pos, count($this->origTokens), 0);
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} else {
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// Fallback
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// TODO Add <?php properly
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$result = "<?php\n" . $this->pStmts($stmts, false);
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}
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return ltrim($this->handleMagicTokens($result));
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}
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protected function pFallback(Node $node) {
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return $this->{'p' . $node->getType()}($node);
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}
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/**
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* Pretty prints a node.
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*
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* This method also handles formatting preservation for nodes.
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*
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* @param Node $node Node to be pretty printed
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*
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* @return string Pretty printed node
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*/
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protected function p(Node $node) : string {
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// No orig tokens means this is a normal pretty print without preservation of formatting
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if (!$this->origTokens) {
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return $this->{'p' . $node->getType()}($node);
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}
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/** @var Node $origNode */
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$origNode = $node->getAttribute('origNode');
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if (null === $origNode) {
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return $this->pFallback($node);
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}
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if (get_class($node) !== get_class($origNode)) {
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// Shouldn't happen
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return $this->pFallback($node);
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}
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$startPos = $origNode->getAttribute('startTokenPos', -1);
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$endPos = $origNode->getAttribute('endTokenPos', -1);
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if ($startPos < 0 || $endPos < 0) {
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// Shouldn't happen
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return $this->pFallback($node);
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}
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if ($node instanceof Expr\New_ && $node->class instanceof Stmt\Class_) {
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// For anonymous classes the new and class nodes are intermixed, this would require
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// special handling (or maybe a new node type just for this?)
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return $this->pFallback($node);
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}
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|
|
$indentAdjustment = $this->indentLevel - $this->getIndentationBefore($startPos);
|
|
|
|
$type = $node->getType();
|
|
$fixupInfo = $this->fixupMap[$type] ?? null;
|
|
|
|
$result = '';
|
|
$pos = $startPos;
|
|
foreach ($node->getSubNodeNames() as $subNodeName) {
|
|
$subNode = $node->$subNodeName;
|
|
$origSubNode = $origNode->$subNodeName;
|
|
|
|
if ((!$subNode instanceof Node && $subNode !== null)
|
|
|| (!$origSubNode instanceof Node && $origSubNode !== null)
|
|
) {
|
|
if ($subNode === $origSubNode) {
|
|
// Unchanged, can reuse old code
|
|
continue;
|
|
}
|
|
|
|
if (is_array($subNode) && is_array($origSubNode)) {
|
|
// Array subnode changed, we might be able to reconstruct it
|
|
$fixup = isset($fixupInfo[$subNodeName]) ? $fixupInfo[$subNodeName] : null;
|
|
$listResult = $this->pArray(
|
|
$subNode, $origSubNode, $pos, $indentAdjustment, $fixup
|
|
);
|
|
if (null === $listResult) {
|
|
return $this->pFallback($node);
|
|
}
|
|
|
|
$result .= $listResult;
|
|
continue;
|
|
}
|
|
|
|
// If a non-node, non-array subnode changed, we don't be able to do a partial
|
|
// reconstructions, as we don't have enough offset information. Pretty print the
|
|
// whole node instead.
|
|
return $this->pFallback($node);
|
|
}
|
|
|
|
$extraLeft = '';
|
|
$extraRight = '';
|
|
if ($origSubNode !== null) {
|
|
$subStartPos = $origSubNode->getAttribute('startTokenPos', -1);
|
|
$subEndPos = $origSubNode->getAttribute('endTokenPos', -1);
|
|
if ($subStartPos < 0 || $subEndPos < 0) {
|
|
// Shouldn't happen
|
|
return $this->pFallback($node);
|
|
}
|
|
} else {
|
|
if ($subNode === null) {
|
|
// Both null, nothing to do
|
|
continue;
|
|
}
|
|
|
|
// A node has been inserted, check if we have insertion information for it
|
|
$key = $type . '->' . $subNodeName;
|
|
if (!isset($this->insertionMap[$key])) {
|
|
return $this->pFallback($node);
|
|
}
|
|
|
|
list($findToken, $extraLeft, $extraRight) = $this->insertionMap[$key];
|
|
if (null !== $findToken) {
|
|
$subStartPos = $this->findRight($pos, $findToken) + 1;
|
|
} else {
|
|
$subStartPos = $pos;
|
|
}
|
|
if (null === $extraLeft && null !== $extraRight) {
|
|
// If inserting on the right only, skipping whitespace looks better
|
|
$subStartPos = $this->skipRightWhitespace($subStartPos);
|
|
}
|
|
$subEndPos = $subStartPos - 1;
|
|
}
|
|
|
|
if (null === $subNode) {
|
|
// A node has been removed, check if we have removal information for it
|
|
$key = $type . '->' . $subNodeName;
|
|
if (!isset($this->removalMap[$key])) {
|
|
return $this->pFallback($node);
|
|
}
|
|
|
|
// Adjust positions to account for additional tokens that must be skipped
|
|
$removalInfo = $this->removalMap[$key];
|
|
if (isset($removalInfo['left'])) {
|
|
$subStartPos = $this->skipLeft($subStartPos - 1, $removalInfo['left']) + 1;
|
|
}
|
|
if (isset($removalInfo['right'])) {
|
|
$subEndPos = $this->skipRight($subEndPos + 1, $removalInfo['right']) - 1;
|
|
}
|
|
}
|
|
|
|
$result .= $this->getTokenCode($pos, $subStartPos, $indentAdjustment);
|
|
|
|
if (null !== $subNode) {
|
|
$result .= $extraLeft;
|
|
|
|
$origIndentLevel = $this->indentLevel;
|
|
$this->indentLevel = $this->getIndentationBefore($subStartPos) + $indentAdjustment;
|
|
|
|
// If it's the same node that was previously in this position, it certainly doesn't
|
|
// need fixup. It's important to check this here, because our fixup checks are more
|
|
// conservative than strictly necessary.
|
|
if (isset($fixupInfo[$subNodeName])
|
|
&& $subNode->getAttribute('origNode') !== $origSubNode
|
|
) {
|
|
$fixup = $fixupInfo[$subNodeName];
|
|
$res = $this->pFixup($fixup, $subNode, $type, $subStartPos, $subEndPos);
|
|
} else {
|
|
$res = $this->p($subNode);
|
|
}
|
|
|
|
$this->safeAppend($result, $res);
|
|
$this->indentLevel = $origIndentLevel;
|
|
|
|
$result .= $extraRight;
|
|
}
|
|
|
|
$pos = $subEndPos + 1;
|
|
}
|
|
|
|
$result .= $this->getTokenCode($pos, $endPos + 1, $indentAdjustment);
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Perform a format-preserving pretty print of an array
|
|
*
|
|
* @param array $nodes New nodes
|
|
* @param array $origNodes Original nodes
|
|
* @param int $pos Current token position (updated by reference)
|
|
* @param int $indentAdjustment Adjustment for indentation
|
|
* @param null|int $fixup Fixup information for array item nodes
|
|
*
|
|
* @return null|string Result of pretty print or null if cannot preserve formatting
|
|
*/
|
|
protected function pArray(array $nodes, array $origNodes, int &$pos, int $indentAdjustment, $fixup) {
|
|
$len = count($nodes);
|
|
$origLen = count($origNodes);
|
|
if ($len !== $origLen) {
|
|
return null;
|
|
}
|
|
|
|
$result = '';
|
|
for ($i = 0; $i < $len; $i++) {
|
|
$arrItem = $nodes[$i];
|
|
$origArrItem = $origNodes[$i];
|
|
if ($arrItem === $origArrItem) {
|
|
// Unchanged, can reuse old code
|
|
continue;
|
|
}
|
|
|
|
if (!$arrItem instanceof Node || !$origArrItem instanceof Node) {
|
|
// We can only handle arrays of nodes meaningfully
|
|
return null;
|
|
}
|
|
|
|
$itemStartPos = $origArrItem->getAttribute('startTokenPos', -1);
|
|
$itemEndPos = $origArrItem->getAttribute('endTokenPos', -1);
|
|
if ($itemStartPos < 0 || $itemEndPos < 0) {
|
|
// Shouldn't happen
|
|
return null;
|
|
}
|
|
|
|
if ($itemEndPos < $itemStartPos) {
|
|
// End can be before start for Nop nodes, because offsets refer to non-whitespace
|
|
// locations, which for an "empty" node might result in an inverted order.
|
|
assert($origArrItem instanceof Stmt\Nop);
|
|
continue;
|
|
}
|
|
|
|
$result .= $this->getTokenCode($pos, $itemStartPos, $indentAdjustment);
|
|
|
|
$origIndentLevel = $this->indentLevel;
|
|
$this->indentLevel = $this->getIndentationBefore($itemStartPos) + $indentAdjustment;
|
|
|
|
if (null !== $fixup && $arrItem->getAttribute('origNode') !== $origArrItem) {
|
|
$res = $this->pFixup($fixup, $arrItem, null, $itemStartPos, $itemEndPos);
|
|
} else {
|
|
$res = $this->p($arrItem);
|
|
}
|
|
$this->safeAppend($result, $res);
|
|
|
|
$this->indentLevel = $origIndentLevel;
|
|
$pos = $itemEndPos + 1;
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Print node with fixups.
|
|
*
|
|
* Fixups here refer to the addition of extra parentheses, braces or other characters, that
|
|
* are required to preserve program semantics in a certain context (e.g. to maintain precedence
|
|
* or because only certain expressions are allowed in certain places).
|
|
*
|
|
* @param int $fixup Fixup type
|
|
* @param Node $subNode Subnode to print
|
|
* @param string|null $parentType Type of parent node
|
|
* @param int $subStartPos Original start pos of subnode
|
|
* @param int $subEndPos Original end pos of subnode
|
|
*
|
|
* @return string Result of fixed-up print of subnode
|
|
*/
|
|
protected function pFixup(int $fixup, Node $subNode, $parentType, int $subStartPos, int $subEndPos) : string {
|
|
switch ($fixup) {
|
|
case self::FIXUP_PREC_LEFT:
|
|
case self::FIXUP_PREC_RIGHT:
|
|
if (!$this->haveParens($subStartPos, $subEndPos)) {
|
|
list($precedence, $associativity) = $this->precedenceMap[$parentType];
|
|
return $this->pPrec($subNode, $precedence, $associativity,
|
|
$fixup === self::FIXUP_PREC_LEFT ? -1 : 1);
|
|
}
|
|
break;
|
|
case self::FIXUP_CALL_LHS:
|
|
if ($this->callLhsRequiresParens($subNode)
|
|
&& !$this->haveParens($subStartPos, $subEndPos)
|
|
) {
|
|
return '(' . $this->p($subNode) . ')';
|
|
}
|
|
break;
|
|
case self::FIXUP_DEREF_LHS:
|
|
if ($this->dereferenceLhsRequiresParens($subNode)
|
|
&& !$this->haveParens($subStartPos, $subEndPos)
|
|
) {
|
|
return '(' . $this->p($subNode) . ')';
|
|
}
|
|
break;
|
|
case self::FIXUP_BRACED_NAME:
|
|
case self::FIXUP_VAR_BRACED_NAME:
|
|
if ($subNode instanceof Expr
|
|
&& !$this->haveBraces($subStartPos, $subEndPos)
|
|
) {
|
|
return ($fixup === self::FIXUP_VAR_BRACED_NAME ? '$' : '')
|
|
. '{' . $this->p($subNode) . '}';
|
|
}
|
|
break;
|
|
case self::FIXUP_ENCAPSED:
|
|
if (!$subNode instanceof Scalar\EncapsedStringPart
|
|
&& !$this->haveBraces($subStartPos, $subEndPos)
|
|
) {
|
|
return '{' . $this->p($subNode) . '}';
|
|
}
|
|
break;
|
|
default:
|
|
throw new \Exception('Cannot happen');
|
|
}
|
|
|
|
// Nothing special to do
|
|
return $this->p($subNode);
|
|
}
|
|
|
|
/**
|
|
* Appends to a string, ensuring whitespace between label characters.
|
|
*
|
|
* Example: "echo" and "$x" result in "echo$x", but "echo" and "x" result in "echo x".
|
|
* Without safeAppend the result would be "echox", which does not preserve semantics.
|
|
*
|
|
* @param string $str
|
|
* @param string $append
|
|
*/
|
|
protected function safeAppend(string &$str, string $append) {
|
|
// $append must not be empty in this function
|
|
if ($str === "") {
|
|
$str = $append;
|
|
return;
|
|
}
|
|
|
|
if (!$this->labelCharMap[$append[0]]
|
|
|| !$this->labelCharMap[$str[\strlen($str) - 1]]) {
|
|
$str .= $append;
|
|
} else {
|
|
$str .= " " . $append;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get indentation before token position
|
|
*
|
|
* @param int $pos Token position
|
|
*
|
|
* @return int Indentation depth (in spaces)
|
|
*/
|
|
protected function getIndentationBefore(int $pos) : int {
|
|
$tokens = $this->origTokens;
|
|
$indent = 0;
|
|
$pos--;
|
|
for (; $pos >= 0; $pos--) {
|
|
if ($tokens[$pos][0] !== T_WHITESPACE) {
|
|
$indent = 0;
|
|
continue;
|
|
}
|
|
$content = $tokens[$pos][1];
|
|
$newlinePos = \strrpos($content, "\n");
|
|
if (false !== $newlinePos) {
|
|
$indent += \strlen($content) - $newlinePos - 1;
|
|
return $indent;
|
|
}
|
|
|
|
$indent += \strlen($content);
|
|
}
|
|
return $indent;
|
|
}
|
|
|
|
/**
|
|
* Whether the fiven position is immediately surrounded by parenthesis.
|
|
*
|
|
* @param int $startPos Start position
|
|
* @param int $endPos End position
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function haveParens(int $startPos, int $endPos) : bool {
|
|
return $this->haveTokenImmediativelyBefore($startPos, '(')
|
|
&& $this->haveTokenImmediatelyAfter($endPos, ')');
|
|
}
|
|
|
|
/**
|
|
* Whether the fiven position is immediately surrounded by braces.
|
|
*
|
|
* @param int $startPos Start position
|
|
* @param int $endPos End position
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function haveBraces(int $startPos, int $endPos) : bool {
|
|
return $this->haveTokenImmediativelyBefore($startPos, '{')
|
|
&& $this->haveTokenImmediatelyAfter($endPos, '}');
|
|
}
|
|
|
|
/**
|
|
* Check whether the position is directly preceded by a certain token type.
|
|
*
|
|
* During this check whitespace and comments are skipped.
|
|
*
|
|
* @param int $pos Position before which the token should occur
|
|
* @param int|string $expectedTokenType Token to check for
|
|
*
|
|
* @return bool Whether the expected token was found
|
|
*/
|
|
protected function haveTokenImmediativelyBefore(int $pos, $expectedTokenType) : bool {
|
|
$tokens = $this->origTokens;
|
|
$pos--;
|
|
for (; $pos >= 0; $pos--) {
|
|
$tokenType = $tokens[$pos][0];
|
|
if ($tokenType === $expectedTokenType) {
|
|
return true;
|
|
}
|
|
if ($tokenType !== T_WHITESPACE
|
|
&& $tokenType !== T_COMMENT && $tokenType !== T_DOC_COMMENT) {
|
|
break;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Check whether the position is directly followed by a certain token type.
|
|
*
|
|
* During this check whitespace and comments are skipped.
|
|
*
|
|
* @param int $pos Position after which the token should occur
|
|
* @param int|string $expectedTokenType Token to check for
|
|
*
|
|
* @return bool Whether the expected token was found
|
|
*/
|
|
protected function haveTokenImmediatelyAfter(int $pos, $expectedTokenType) : bool {
|
|
$tokens = $this->origTokens;
|
|
$pos++;
|
|
for (; $pos < \count($tokens); $pos++) {
|
|
$tokenType = $tokens[$pos][0];
|
|
if ($tokenType === $expectedTokenType) {
|
|
return true;
|
|
}
|
|
if ($tokenType !== T_WHITESPACE
|
|
&& $tokenType !== T_COMMENT && $tokenType !== T_DOC_COMMENT) {
|
|
break;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Get the code corresponding to a token offset range, optionally adjusted for indentation.
|
|
*
|
|
* @param int $from Token start position (inclusive)
|
|
* @param int $to Token end position (exclusive)
|
|
* @param int $indent By how much the code should be indented (can be negative as well)
|
|
*
|
|
* @return string Code corresponding to token range, adjusted for indentation
|
|
*/
|
|
protected function getTokenCode(int $from, int $to, int $indent) : string {
|
|
$tokens = $this->origTokens;
|
|
$result = '';
|
|
for ($pos = $from; $pos < $to; $pos++) {
|
|
$token = $tokens[$pos];
|
|
if (\is_array($token)) {
|
|
$type = $token[0];
|
|
$content = $token[1];
|
|
if ($type === T_CONSTANT_ENCAPSED_STRING || $type === T_ENCAPSED_AND_WHITESPACE) {
|
|
$result .= $this->pNoIndent($content);
|
|
} else {
|
|
// TODO Handle non-space indentation
|
|
if ($indent < 0) {
|
|
$result .= str_replace("\n" . str_repeat(" ", -$indent), "\n", $content);
|
|
} else if ($indent > 0) {
|
|
$result .= str_replace("\n", "\n" . str_repeat(" ", $indent), $content);
|
|
} else {
|
|
$result .= $content;
|
|
}
|
|
}
|
|
} else {
|
|
$result .= $token;
|
|
}
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
protected function skipLeft($pos, $skipTokenType) {
|
|
$tokens = $this->origTokens;
|
|
|
|
$pos = $this->skipLeftWhitespace($pos);
|
|
if ($skipTokenType === T_WHITESPACE) {
|
|
return $pos;
|
|
}
|
|
|
|
if ($tokens[$pos][0] !== $skipTokenType) {
|
|
// Shouldn't happen. The skip token MUST be there
|
|
throw new \Exception('Encountered unexpected token');
|
|
}
|
|
$pos--;
|
|
|
|
return $this->skipLeftWhitespace($pos);
|
|
}
|
|
|
|
protected function skipRight($pos, $skipTokenType) {
|
|
$tokens = $this->origTokens;
|
|
|
|
$pos = $this->skipRightWhitespace($pos);
|
|
if ($skipTokenType === T_WHITESPACE) {
|
|
return $pos;
|
|
}
|
|
|
|
if ($tokens[$pos][0] !== $skipTokenType) {
|
|
// Shouldn't happen. The skip token MUST be there
|
|
throw new \Exception('Encountered unexpected token');
|
|
}
|
|
$pos++;
|
|
|
|
return $this->skipRightWhitespace($pos);
|
|
}
|
|
|
|
protected function skipLeftWhitespace($pos) {
|
|
$tokens = $this->origTokens;
|
|
for (; $pos >= 0; $pos--) {
|
|
$type = $tokens[$pos][0];
|
|
if ($type !== T_WHITESPACE && $type !== T_COMMENT && $type !== T_DOC_COMMENT) {
|
|
break;
|
|
}
|
|
}
|
|
return $pos;
|
|
}
|
|
|
|
protected function skipRightWhitespace($pos) {
|
|
$tokens = $this->origTokens;
|
|
for ($count = \count($tokens); $pos < $count; $pos++) {
|
|
$type = $tokens[$pos][0];
|
|
if ($type !== T_WHITESPACE && $type !== T_COMMENT && $type !== T_DOC_COMMENT) {
|
|
break;
|
|
}
|
|
}
|
|
return $pos;
|
|
}
|
|
|
|
protected function findRight($pos, $findTokenType) {
|
|
$tokens = $this->origTokens;
|
|
for ($count = \count($tokens); $pos < $count; $pos++) {
|
|
$type = $tokens[$pos][0];
|
|
if ($type === $findTokenType) {
|
|
return $pos;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Determines whether the LHS of a call must be wrapped in parenthesis.
|
|
*
|
|
* @param Node $node LHS of a call
|
|
*
|
|
* @return bool Whether parentheses are required
|
|
*/
|
|
protected function callLhsRequiresParens(Node $node) : bool {
|
|
return !($node instanceof Node\Name
|
|
|| $node instanceof Expr\Variable
|
|
|| $node instanceof Expr\ArrayDimFetch
|
|
|| $node instanceof Expr\FuncCall
|
|
|| $node instanceof Expr\MethodCall
|
|
|| $node instanceof Expr\StaticCall
|
|
|| $node instanceof Expr\Array_);
|
|
}
|
|
|
|
/**
|
|
* Determines whether the LHS of a dereferencing operation must be wrapped in parenthesis.
|
|
*
|
|
* @param Node $node LHS of dereferencing operation
|
|
*
|
|
* @return bool Whether parentheses are required
|
|
*/
|
|
protected function dereferenceLhsRequiresParens(Node $node) : bool {
|
|
return !($node instanceof Expr\Variable
|
|
|| $node instanceof Node\Name
|
|
|| $node instanceof Expr\ArrayDimFetch
|
|
|| $node instanceof Expr\PropertyFetch
|
|
|| $node instanceof Expr\StaticPropertyFetch
|
|
|| $node instanceof Expr\FuncCall
|
|
|| $node instanceof Expr\MethodCall
|
|
|| $node instanceof Expr\StaticCall
|
|
|| $node instanceof Expr\Array_
|
|
|| $node instanceof Scalar\String_
|
|
|| $node instanceof Expr\ConstFetch
|
|
|| $node instanceof Expr\ClassConstFetch);
|
|
}
|
|
|
|
/**
|
|
* Lazily initializes label char map.
|
|
*
|
|
* The label char map determines whether a certain character may occur in a label.
|
|
*/
|
|
protected function initializeLabelCharMap() {
|
|
if ($this->labelCharMap) return;
|
|
|
|
$this->labelCharMap = [];
|
|
for ($i = 0; $i < 256; $i++) {
|
|
// Since PHP 7.1 The lower range is 0x80. However, we also want to support code for
|
|
// older versions.
|
|
$this->labelCharMap[chr($i)] = $i >= 0x7f || ctype_alnum($i);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Lazily initializes fixup map.
|
|
*
|
|
* The fixup map is used to determine whether a certain subnode of a certain node may require
|
|
* some kind of "fixup" operation, e.g. the addition of parenthesis or braces.
|
|
*/
|
|
protected function initializeFixupMap() {
|
|
if ($this->fixupMap) return;
|
|
|
|
$this->fixupMap = [
|
|
'Expr_PreInc' => ['var' => self::FIXUP_PREC_RIGHT],
|
|
'Expr_PreDec' => ['var' => self::FIXUP_PREC_RIGHT],
|
|
'Expr_PostInc' => ['var' => self::FIXUP_PREC_LEFT],
|
|
'Expr_PostDec' => ['var' => self::FIXUP_PREC_LEFT],
|
|
'Expr_Instanceof' => [
|
|
'expr' => self::FIXUP_PREC_LEFT,
|
|
'class' => self::FIXUP_PREC_RIGHT,
|
|
],
|
|
'Expr_Ternary' => [
|
|
'cond' => self::FIXUP_PREC_LEFT,
|
|
'else' => self::FIXUP_PREC_RIGHT,
|
|
],
|
|
|
|
'Expr_FuncCall' => ['name' => self::FIXUP_CALL_LHS],
|
|
'Expr_StaticCall' => ['class' => self::FIXUP_DEREF_LHS],
|
|
'Expr_ArrayDimFetch' => ['var' => self::FIXUP_DEREF_LHS],
|
|
'Expr_MethodCall' => [
|
|
'var' => self::FIXUP_DEREF_LHS,
|
|
'name' => self::FIXUP_BRACED_NAME,
|
|
],
|
|
'Expr_StaticPropertyFetch' => [
|
|
'class' => self::FIXUP_DEREF_LHS,
|
|
'name' => self::FIXUP_VAR_BRACED_NAME,
|
|
],
|
|
'Expr_PropertyFetch' => [
|
|
'var' => self::FIXUP_DEREF_LHS,
|
|
'name' => self::FIXUP_BRACED_NAME,
|
|
],
|
|
'Scalar_Encapsed' => [
|
|
'parts' => self::FIXUP_ENCAPSED,
|
|
],
|
|
];
|
|
|
|
$binaryOps = [
|
|
'Expr_BinaryOp_Pow', 'Expr_BinaryOp_Mul', 'Expr_BinaryOp_Div', 'Expr_BinaryOp_Mod',
|
|
'Expr_BinaryOp_Plus', 'Expr_BinaryOp_Minus', 'Expr_BinaryOp_Concat',
|
|
'Expr_BinaryOp_ShiftLeft', 'Expr_BinaryOp_ShiftRight', 'Expr_BinaryOp_Smaller',
|
|
'Expr_BinaryOp_SmallerOrEqual', 'Expr_BinaryOp_Greater', 'Expr_BinaryOp_GreaterOrEqual',
|
|
'Expr_BinaryOp_Equal', 'Expr_BinaryOp_NotEqual', 'Expr_BinaryOp_Identical',
|
|
'Expr_BinaryOp_NotIdentical', 'Expr_BinaryOp_Spaceship', 'Expr_BinaryOp_BitwiseAnd',
|
|
'Expr_BinaryOp_BitwiseXor', 'Expr_BinaryOp_BitwiseOr', 'Expr_BinaryOp_BooleanAnd',
|
|
'Expr_BinaryOp_BooleanOr', 'Expr_BinaryOp_Coalesce', 'Expr_BinaryOp_LogicalAnd',
|
|
'Expr_BinaryOp_LogicalXor', 'Expr_BinaryOp_LogicalOr',
|
|
];
|
|
foreach ($binaryOps as $binaryOp) {
|
|
$this->fixupMap[$binaryOp] = [
|
|
'left' => self::FIXUP_PREC_LEFT,
|
|
'right' => self::FIXUP_PREC_RIGHT
|
|
];
|
|
}
|
|
|
|
$assignOps = [
|
|
'Expr_Assign', 'Expr_AssignRef', 'Expr_AssignOp_Plus', 'Expr_AssignOp_Minus',
|
|
'Expr_AssignOp_Mul', 'Expr_AssignOp_Div', 'Expr_AssignOp_Concat', 'Expr_AssignOp_Mod',
|
|
'Expr_AssignOp_BitwiseAnd', 'Expr_AssignOp_BitwiseOr', 'Expr_AssignOp_BitwiseXor',
|
|
'Expr_AssignOp_ShiftLeft', 'Expr_AssignOp_ShiftRight', 'Expr_AssignOp_Pow',
|
|
];
|
|
foreach ($assignOps as $assignOp) {
|
|
$this->fixupMap[$assignOp] = [
|
|
'var' => self::FIXUP_PREC_LEFT,
|
|
'expr' => self::FIXUP_PREC_RIGHT,
|
|
];
|
|
}
|
|
|
|
$prefixOps = [
|
|
'Expr_BitwiseNot', 'Expr_BooleanNot', 'Expr_UnaryPlus', 'Expr_UnaryMinus',
|
|
'Expr_Cast_Int', 'Expr_Cast_Double', 'Expr_Cast_String', 'Expr_Cast_Array',
|
|
'Expr_Cast_Object', 'Expr_Cast_Bool', 'Expr_Cast_Unset', 'Expr_ErrorSuppress',
|
|
'Expr_YieldFrom', 'Expr_Print', 'Expr_Include',
|
|
];
|
|
foreach ($prefixOps as $prefixOp) {
|
|
$this->fixupMap[$prefixOp] = ['expr' => self::FIXUP_PREC_RIGHT];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Lazily initializes the removal map.
|
|
*
|
|
* The removal map is used to determine which additional tokens should be returned when a
|
|
* certain node is replaced by null.
|
|
*/
|
|
protected function initializeRemovalMap() {
|
|
if ($this->removalMap) return;
|
|
|
|
$stripBoth = ['left' => T_WHITESPACE, 'right' => T_WHITESPACE];
|
|
$stripLeft = ['left' => T_WHITESPACE];
|
|
$stripRight = ['right' => T_WHITESPACE];
|
|
$stripDoubleArrow = ['right' => T_DOUBLE_ARROW];
|
|
$stripColon = ['left' => ':'];
|
|
$stripEquals = ['left' => '='];
|
|
$this->removalMap = [
|
|
'Expr_ArrayDimFetch->dim' => $stripBoth,
|
|
'Expr_ArrayItem->key' => $stripDoubleArrow,
|
|
'Expr_Closure->returnType' => $stripColon,
|
|
'Expr_Exit->expr' => $stripBoth,
|
|
'Expr_Ternary->if' => $stripBoth,
|
|
'Expr_Yield->key' => $stripDoubleArrow,
|
|
'Expr_Yield->value' => $stripBoth,
|
|
'Param->type' => $stripRight,
|
|
'Param->default' => $stripEquals,
|
|
'Stmt_Break->num' => $stripBoth,
|
|
'Stmt_ClassMethod->returnType' => $stripColon,
|
|
'Stmt_Class->extends' => ['left' => T_EXTENDS],
|
|
'Stmt_Continue->num' => $stripBoth,
|
|
'Stmt_Foreach->keyVar' => $stripDoubleArrow,
|
|
'Stmt_Function->returnType' => $stripColon,
|
|
'Stmt_If->else' => $stripLeft,
|
|
'Stmt_Namespace->name' => $stripLeft,
|
|
'Stmt_PropertyProperty->default' => $stripEquals,
|
|
'Stmt_Return->expr' => $stripBoth,
|
|
'Stmt_StaticVar->default' => $stripEquals,
|
|
'Stmt_TraitUseAdaptation_Alias->newName' => $stripLeft,
|
|
'Stmt_TryCatch->finally' => $stripLeft,
|
|
// 'Stmt_Case->cond': Replace with "default"
|
|
// 'Stmt_Class->name': Unclear what to do
|
|
// 'Stmt_Declare->stmts': Not a plain node
|
|
// 'Stmt_TraitUseAdaptation_Alias->newModifier': Not a plain node
|
|
];
|
|
}
|
|
|
|
protected function initializeInsertionMap() {
|
|
if ($this->insertionMap) return;
|
|
|
|
// TODO: "yield" where both key and value are inserted doesn't work
|
|
$this->insertionMap = [
|
|
'Expr_ArrayDimFetch->dim' => ['[', null, null],
|
|
'Expr_ArrayItem->key' => [null, null, ' => '],
|
|
'Expr_Closure->returnType' => [')', ' : ', null],
|
|
'Expr_Ternary->if' => ['?', ' ', ' '],
|
|
'Expr_Yield->key' => [T_YIELD, null, ' => '],
|
|
'Expr_Yield->value' => [T_YIELD, ' ', null],
|
|
'Param->type' => [null, null, ' '],
|
|
'Param->default' => [null, ' = ', null],
|
|
'Stmt_Break->num' => [T_BREAK, ' ', null],
|
|
'Stmt_ClassMethod->returnType' => [')', ' : ', null],
|
|
'Stmt_Class->extends' => [null, ' extends ', null],
|
|
'Stmt_Continue->num' => [T_CONTINUE, ' ', null],
|
|
'Stmt_Foreach->keyVar' => [T_AS, null, ' => '],
|
|
'Stmt_Function->returnType' => [')', ' : ', null],
|
|
//'Stmt_If->else' => [null, ' ', null], // TODO
|
|
'Stmt_Namespace->name' => [T_NAMESPACE, ' ', null],
|
|
'Stmt_PropertyProperty->default' => [null, ' = ', null],
|
|
'Stmt_Return->expr' => [T_RETURN, ' ', null],
|
|
'Stmt_StaticVar->default' => [null, ' = ', null],
|
|
//'Stmt_TraitUseAdaptation_Alias->newName' => [T_AS, ' ', null], // TODO
|
|
'Stmt_TryCatch->finally' => [null, ' ', null],
|
|
|
|
// 'Expr_Exit->expr': Complicated due to optional ()
|
|
// 'Stmt_Case->cond': Conversion from default to case
|
|
// 'Stmt_Class->name': Unclear
|
|
// 'Stmt_Declare->stmts': Not a proper node
|
|
// 'Stmt_TraitUseAdaptation_Alias->newModifier': Not a proper node
|
|
];
|
|
}
|
|
}
|