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https://github.com/danog/PHP-Parser.git
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Move Stmt\Namespace_::postprocess() to parser
This commit is contained in:
nikic
parent
2e195d7cb2
commit
6d1f77132c
@ -112,7 +112,7 @@
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%%
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start:
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top_statement_list { $$ = Stmt\Namespace_::postprocess($1); }
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top_statement_list { $$ = $this->handleNamespaces($1); }
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;
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top_statement_list:
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@ -45,83 +45,4 @@ class Namespace_ extends Node\Stmt
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}
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}
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}
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public static function postprocess(array $stmts) {
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// null = not in namespace, false = semicolon style, true = bracket style
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$bracketed = null;
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// whether any statements that aren't allowed before a namespace declaration are encountered
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// (the only valid statement currently is a declare)
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$hasNotAllowedStmts = false;
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// offsets for semicolon style namespaces
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// (required for transplanting the following statements into their ->stmts property)
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$nsOffsets = array();
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foreach ($stmts as $i => $stmt) {
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if ($stmt instanceof self) {
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// ->stmts is null if semicolon style is used
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$currentBracketed = null !== $stmt->stmts;
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// if no namespace statement has been encountered yet
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if (!isset($bracketed)) {
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// set the namespacing style
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$bracketed = $currentBracketed;
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// and ensure that it isn't preceded by a not allowed statement
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if ($hasNotAllowedStmts) {
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throw new Error('Namespace declaration statement has to be the very first statement in the script', $stmt->getLine());
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}
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// otherwise ensure that the style of the current namespace matches the style of
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// namespaceing used before in this document
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} elseif ($bracketed !== $currentBracketed) {
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throw new Error('Cannot mix bracketed namespace declarations with unbracketed namespace declarations', $stmt->getLine());
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}
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// for semicolon style namespaces remember the offset
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if (!$bracketed) {
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$nsOffsets[] = $i;
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}
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// declare() and __halt_compiler() are the only valid statements outside of namespace declarations
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} elseif (!$stmt instanceof Declare_
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&& !$stmt instanceof HaltCompiler
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) {
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if (true === $bracketed) {
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throw new Error('No code may exist outside of namespace {}', $stmt->getLine());
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}
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$hasNotAllowedStmts = true;
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}
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}
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// if bracketed namespaces were used or no namespaces were used at all just return the
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// original statements
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if (!isset($bracketed) || true === $bracketed) {
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return $stmts;
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// for semicolon style transplant statements
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} else {
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// take all statements preceding the first namespace
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$newStmts = array_slice($stmts, 0, $nsOffsets[0]);
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// iterate over all following namespaces
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for ($i = 0, $c = count($nsOffsets); $i < $c; ++$i) {
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$newStmts[] = $nsStmt = $stmts[$nsOffsets[$i]];
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// the last namespace takes all statements after it
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if ($c === $i + 1) {
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$nsStmt->stmts = array_slice($stmts, $nsOffsets[$i] + 1);
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// if the last statement is __halt_compiler() put it outside the namespace
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if (end($nsStmt->stmts) instanceof HaltCompiler) {
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$newStmts[] = array_pop($nsStmt->stmts);
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}
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// and all the others take all statements between the current and the following one
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} else {
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$nsStmt->stmts = array_slice($stmts, $nsOffsets[$i] + 1, $nsOffsets[$i + 1] - $nsOffsets[$i] - 1);
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}
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}
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return $newStmts;
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}
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}
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}
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@ -1001,7 +1001,7 @@ class Parser extends ParserAbstract
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}
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protected function reduceRule1($attributes) {
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$this->semValue = Node\Stmt\Namespace_::postprocess($this->semStack[$this->stackPos-(1-1)]);
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$this->semValue = $this->handleNamespaces($this->semStack[$this->stackPos-(1-1)]);
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}
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protected function reduceRule2($attributes) {
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@ -273,6 +273,10 @@ abstract class ParserAbstract
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return $expected;
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}
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/*
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* Tracing functions used for debugging the parser.
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*/
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protected function traceNewState($state, $symbol) {
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echo '% State ' . $state
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. ', Lookahead ' . ($symbol == self::SYMBOL_NONE ? '--none--' : $this->symbolToName[$symbol]) . "\n";
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@ -293,4 +297,87 @@ abstract class ParserAbstract
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protected function traceReduce($n) {
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echo '% Reduce by (' . $n . ') ' . $this->productions[$n] . "\n";
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}
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/*
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* Helper functions invoked by semantic actions
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*/
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protected function handleNamespaces(array $stmts) {
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// null = not in namespace, false = semicolon style, true = bracket style
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$bracketed = null;
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// whether any statements that aren't allowed before a namespace declaration are encountered
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// (the only valid statement currently is a declare)
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$hasNotAllowedStmts = false;
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// offsets for semicolon style namespaces
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// (required for transplanting the following statements into their ->stmts property)
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$nsOffsets = array();
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foreach ($stmts as $i => $stmt) {
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if ($stmt instanceof Node\Stmt\Namespace_) {
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// ->stmts is null if semicolon style is used
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$currentBracketed = null !== $stmt->stmts;
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// if no namespace statement has been encountered yet
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if (!isset($bracketed)) {
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// set the namespacing style
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$bracketed = $currentBracketed;
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// and ensure that it isn't preceded by a not allowed statement
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if ($hasNotAllowedStmts) {
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throw new Error('Namespace declaration statement has to be the very first statement in the script', $stmt->getLine());
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}
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// otherwise ensure that the style of the current namespace matches the style of
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// namespaceing used before in this document
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} elseif ($bracketed !== $currentBracketed) {
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throw new Error('Cannot mix bracketed namespace declarations with unbracketed namespace declarations', $stmt->getLine());
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}
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// for semicolon style namespaces remember the offset
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if (!$bracketed) {
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$nsOffsets[] = $i;
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}
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// declare() and __halt_compiler() are the only valid statements outside of namespace declarations
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} elseif (!$stmt instanceof Node\Stmt\Declare_
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&& !$stmt instanceof Node\Stmt\HaltCompiler
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) {
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if (true === $bracketed) {
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throw new Error('No code may exist outside of namespace {}', $stmt->getLine());
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}
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$hasNotAllowedStmts = true;
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}
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}
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// if bracketed namespaces were used or no namespaces were used at all just return the
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// original statements
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if (!isset($bracketed) || true === $bracketed) {
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return $stmts;
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// for semicolon style transplant statements
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} else {
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// take all statements preceding the first namespace
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$newStmts = array_slice($stmts, 0, $nsOffsets[0]);
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// iterate over all following namespaces
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for ($i = 0, $c = count($nsOffsets); $i < $c; ++$i) {
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$newStmts[] = $nsStmt = $stmts[$nsOffsets[$i]];
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// the last namespace takes all statements after it
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if ($c === $i + 1) {
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$nsStmt->stmts = array_slice($stmts, $nsOffsets[$i] + 1);
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// if the last statement is __halt_compiler() put it outside the namespace
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if (end($nsStmt->stmts) instanceof Node\Stmt\HaltCompiler) {
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$newStmts[] = array_pop($nsStmt->stmts);
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}
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// and all the others take all statements between the current and the following one
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} else {
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$nsStmt->stmts = array_slice($stmts, $nsOffsets[$i] + 1, $nsOffsets[$i + 1] - $nsOffsets[$i] - 1);
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}
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}
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return $newStmts;
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}
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}
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}
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