mirror of
https://github.com/phabelio/PHP-Parser.git
synced 2024-11-26 20:14:46 +01:00
Partial support for flexible heredoc/nowdoc
This only implements the token emulation part, it does not yet handle the indentation stripping. Emulating this feature on old PHP versions is really tough and is not going to work perfectly, but hopefully this implementation is "good enough".
This commit is contained in:
Nikita Popov
parent
fa6ee28600
commit
83766c8c0e
@ -2,7 +2,202 @@
|
||||
|
||||
namespace PhpParser\Lexer;
|
||||
|
||||
use PhpParser\Error;
|
||||
use PhpParser\ErrorHandler;
|
||||
|
||||
class Emulative extends \PhpParser\Lexer
|
||||
{
|
||||
/* No features requiring emulation have been added in PHP > 7.0 */
|
||||
}
|
||||
const PHP_7_3 = '7.3.0dev';
|
||||
|
||||
/**
|
||||
* @var array Patches used to reverse changes introduced in the code
|
||||
*/
|
||||
private $patches;
|
||||
|
||||
public function startLexing(string $code, ErrorHandler $errorHandler = null) {
|
||||
$this->patches = [];
|
||||
$preparedCode = $this->prepareCode($code);
|
||||
if (null === $preparedCode) {
|
||||
// Nothing to emulate, yay
|
||||
parent::startLexing($code, $errorHandler);
|
||||
return;
|
||||
}
|
||||
|
||||
$collector = new ErrorHandler\Collecting();
|
||||
parent::startLexing($preparedCode, $collector);
|
||||
$this->fixupTokens();
|
||||
|
||||
$errors = $collector->getErrors();
|
||||
if (!empty($errors)) {
|
||||
$this->fixupErrors($errors);
|
||||
foreach ($errors as $error) {
|
||||
$errorHandler->handleError($error);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Prepares code for emulation. If nothing has to be emulated null is returned.
|
||||
*
|
||||
* @param string $code
|
||||
* @return null|string
|
||||
*/
|
||||
private function prepareCode(string $code) {
|
||||
if (version_compare(\PHP_VERSION, self::PHP_7_3, '>=')) {
|
||||
return null;
|
||||
}
|
||||
|
||||
if (strpos($code, '<<<') === false) {
|
||||
// Definitely doesn't contain heredoc/nowdoc
|
||||
return null;
|
||||
}
|
||||
|
||||
$flexibleDocStringRegex = <<<'REGEX'
|
||||
/<<<[ \t]*(['"]?)([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)\1\r?\n
|
||||
(?:.*\r?\n)*?
|
||||
(?<indentation>\h*)\2(?<separator>(?:;?[\r\n])?)/x
|
||||
REGEX;
|
||||
if (!preg_match_all($flexibleDocStringRegex, $code, $matches, PREG_SET_ORDER|PREG_OFFSET_CAPTURE)) {
|
||||
// No heredoc/nowdoc found
|
||||
return null;
|
||||
}
|
||||
|
||||
// Keep track of how much we need to adjust string offsets due to the modifications we
|
||||
// already made
|
||||
$posDelta = 0;
|
||||
foreach ($matches as $match) {
|
||||
$indentation = $match['indentation'][0];
|
||||
$indentationStart = $match['indentation'][1];
|
||||
|
||||
$separator = $match['separator'][0];
|
||||
$separatorStart = $match['separator'][1];
|
||||
|
||||
if ($indentation === '' && $separator !== '') {
|
||||
// Ordinary heredoc/nowdoc
|
||||
continue;
|
||||
}
|
||||
|
||||
if ($indentation !== '') {
|
||||
// Remove indentation
|
||||
$indentationLen = strlen($indentation);
|
||||
$code = substr_replace($code, '', $indentationStart + $posDelta, $indentationLen);
|
||||
$this->patches[] = [$indentationStart + $posDelta, 'add', $indentation];
|
||||
$posDelta -= $indentationLen;
|
||||
}
|
||||
|
||||
if ($separator === '') {
|
||||
// Insert newline as separator
|
||||
$code = substr_replace($code, "\n", $separatorStart + $posDelta, 0);
|
||||
$this->patches[] = [$separatorStart + $posDelta, 'remove', "\n"];
|
||||
$posDelta += 1;
|
||||
}
|
||||
}
|
||||
|
||||
if (empty($this->patches)) {
|
||||
// We did not end up emulating anything
|
||||
return null;
|
||||
}
|
||||
|
||||
return $code;
|
||||
}
|
||||
|
||||
private function fixupTokens() {
|
||||
assert(count($this->patches) > 0);
|
||||
|
||||
// Load first patch
|
||||
$patchIdx = 0;
|
||||
list($patchPos, $patchType, $patchText) = $this->patches[$patchIdx];
|
||||
|
||||
// We use a manual loop over the tokens, because we modify the array on the fly
|
||||
$pos = 0;
|
||||
for ($i = 0, $c = \count($this->tokens); $i < $c; $i++) {
|
||||
$token = $this->tokens[$i];
|
||||
if (\is_string($token)) {
|
||||
// We assume that patches don't apply to string tokens
|
||||
$pos += \strlen($token);
|
||||
continue;
|
||||
}
|
||||
|
||||
$len = \strlen($token[1]);
|
||||
$posDelta = 0;
|
||||
while ($patchPos >= $pos && $patchPos < $pos + $len) {
|
||||
$patchTextLen = \strlen($patchText);
|
||||
if ($patchType === 'remove') {
|
||||
if ($patchPos === $pos && $patchTextLen === $len) {
|
||||
// Remove token entirely
|
||||
array_splice($this->tokens, $i, 1, []);
|
||||
$i--;
|
||||
$c--;
|
||||
} else {
|
||||
// Remove from token string
|
||||
$this->tokens[$i][1] = substr_replace(
|
||||
$token[1], '', $patchPos - $pos + $posDelta, $patchTextLen
|
||||
);
|
||||
$posDelta -= $patchTextLen;
|
||||
}
|
||||
} elseif ($patchType === 'add') {
|
||||
// Insert into the token string
|
||||
$this->tokens[$i][1] = substr_replace(
|
||||
$token[1], $patchText, $patchPos - $pos + $posDelta, 0
|
||||
);
|
||||
$posDelta += $patchTextLen;
|
||||
} else {
|
||||
assert(false);
|
||||
}
|
||||
|
||||
// Fetch the next patch
|
||||
$patchIdx++;
|
||||
if ($patchIdx >= \count($this->patches)) {
|
||||
// No more patches, we're done
|
||||
return;
|
||||
}
|
||||
|
||||
list($patchPos, $patchType, $patchText) = $this->patches[$patchIdx];
|
||||
|
||||
// Multiple patches may apply to the same token. Reload the current one to check
|
||||
// If the new patch applies
|
||||
$token = $this->tokens[$i];
|
||||
}
|
||||
|
||||
$pos += $len;
|
||||
}
|
||||
|
||||
// A patch did not apply
|
||||
assert(false);
|
||||
}
|
||||
|
||||
/**
|
||||
* Fixup line and position information in errors.
|
||||
*
|
||||
* @param Error[] $errors
|
||||
*/
|
||||
private function fixupErrors(array $errors) {
|
||||
foreach ($errors as $error) {
|
||||
$attrs = $error->getAttributes();
|
||||
|
||||
$posDelta = 0;
|
||||
$lineDelta = 0;
|
||||
foreach ($this->patches as $patch) {
|
||||
list($patchPos, $patchType, $patchText) = $patch;
|
||||
if ($patchPos >= $attrs['startFilePos']) {
|
||||
// No longer relevant
|
||||
break;
|
||||
}
|
||||
|
||||
if ($patchType === 'add') {
|
||||
$posDelta += strlen($patchText);
|
||||
$lineDelta += substr_count($patchText, "\n");
|
||||
} else {
|
||||
$posDelta -= strlen($patchText);
|
||||
$lineDelta -= substr_count($patchText, "\n");
|
||||
}
|
||||
}
|
||||
|
||||
$attrs['startFilePos'] += $posDelta;
|
||||
$attrs['endFilePos'] += $posDelta;
|
||||
$attrs['startLine'] += $lineDelta;
|
||||
$attrs['endLine'] += $lineDelta;
|
||||
$error->setAttributes($attrs);
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -2,6 +2,7 @@
|
||||
|
||||
namespace PhpParser\Lexer;
|
||||
|
||||
use PhpParser\ErrorHandler;
|
||||
use PhpParser\LexerTest;
|
||||
use PhpParser\Parser\Tokens;
|
||||
|
||||
@ -63,12 +64,11 @@ class EmulativeTest extends LexerTest
|
||||
$lexer = $this->getLexer();
|
||||
$lexer->startLexing('<?php ' . $code);
|
||||
|
||||
foreach ($expectedTokens as $expectedToken) {
|
||||
list($expectedTokenType, $expectedTokenText) = $expectedToken;
|
||||
$this->assertSame($expectedTokenType, $lexer->getNextToken($text));
|
||||
$this->assertSame($expectedTokenText, $text);
|
||||
$tokens = [];
|
||||
while (0 !== $token = $lexer->getNextToken($text)) {
|
||||
$tokens[] = [$token, $text];
|
||||
}
|
||||
$this->assertSame(0, $lexer->getNextToken());
|
||||
$this->assertSame($expectedTokens, $tokens);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -85,6 +85,29 @@ class EmulativeTest extends LexerTest
|
||||
$this->assertSame(0, $lexer->getNextToken());
|
||||
}
|
||||
|
||||
/**
|
||||
* @dataProvider provideTestLexNewFeatures
|
||||
*/
|
||||
public function testErrorAfterEmulation($code) {
|
||||
$errorHandler = new ErrorHandler\Collecting;
|
||||
$lexer = $this->getLexer([]);
|
||||
$lexer->startLexing('<?php ' . $code . "\0", $errorHandler);
|
||||
|
||||
$errors = $errorHandler->getErrors();
|
||||
$this->assertCount(1, $errors);
|
||||
|
||||
$error = $errors[0];
|
||||
$this->assertSame('Unexpected null byte', $error->getRawMessage());
|
||||
|
||||
$attrs = $error->getAttributes();
|
||||
$expPos = strlen('<?php ' . $code);
|
||||
$expLine = 1 + substr_count('<?php ' . $code, "\n");
|
||||
$this->assertSame($expPos, $attrs['startFilePos']);
|
||||
$this->assertSame($expPos, $attrs['endFilePos']);
|
||||
$this->assertSame($expLine, $attrs['startLine']);
|
||||
$this->assertSame($expLine, $attrs['endLine']);
|
||||
}
|
||||
|
||||
public function provideTestLexNewFeatures() {
|
||||
return [
|
||||
['yield from', [
|
||||
@ -128,6 +151,38 @@ class EmulativeTest extends LexerTest
|
||||
[Tokens::T_END_HEREDOC, 'NOWDOC'],
|
||||
[ord(';'), ';'],
|
||||
]],
|
||||
|
||||
// Flexible heredoc/nowdoc
|
||||
["<<<LABEL\nLABEL,", [
|
||||
[Tokens::T_START_HEREDOC, "<<<LABEL\n"],
|
||||
[Tokens::T_END_HEREDOC, "LABEL"],
|
||||
[ord(','), ','],
|
||||
]],
|
||||
["<<<LABEL\n LABEL,", [
|
||||
[Tokens::T_START_HEREDOC, "<<<LABEL\n"],
|
||||
[Tokens::T_END_HEREDOC, " LABEL"],
|
||||
[ord(','), ','],
|
||||
]],
|
||||
["<<<LABEL\n Foo\n LABEL;", [
|
||||
[Tokens::T_START_HEREDOC, "<<<LABEL\n"],
|
||||
[Tokens::T_ENCAPSED_AND_WHITESPACE, " Foo\n"],
|
||||
[Tokens::T_END_HEREDOC, " LABEL"],
|
||||
[ord(';'), ';'],
|
||||
]],
|
||||
["<<<A\n A,<<<A\n A,", [
|
||||
[Tokens::T_START_HEREDOC, "<<<A\n"],
|
||||
[Tokens::T_END_HEREDOC, " A"],
|
||||
[ord(','), ','],
|
||||
[Tokens::T_START_HEREDOC, "<<<A\n"],
|
||||
[Tokens::T_END_HEREDOC, " A"],
|
||||
[ord(','), ','],
|
||||
]],
|
||||
// Interpretation changed
|
||||
["<<<LABEL\n LABEL\nLABEL\n", [
|
||||
[Tokens::T_START_HEREDOC, "<<<LABEL\n"],
|
||||
[Tokens::T_END_HEREDOC, " LABEL"],
|
||||
[Tokens::T_STRING, "LABEL"],
|
||||
]],
|
||||
];
|
||||
}
|
||||
}
|
||||
|
||||
47
test/code/parser/scalar/flexibleDocString.test
Normal file
47
test/code/parser/scalar/flexibleDocString.test
Normal file
@ -0,0 +1,47 @@
|
||||
Flexible heredoc/nowdoc (PHP 7.3)
|
||||
-----
|
||||
<?php
|
||||
|
||||
$ary = [
|
||||
<<<FOO
|
||||
Test
|
||||
FOO,
|
||||
// Value here is wrong
|
||||
<<<'BAR'
|
||||
Test
|
||||
BAR,
|
||||
];
|
||||
-----
|
||||
array(
|
||||
0: Stmt_Expression(
|
||||
expr: Expr_Assign(
|
||||
var: Expr_Variable(
|
||||
name: ary
|
||||
)
|
||||
expr: Expr_Array(
|
||||
items: array(
|
||||
0: Expr_ArrayItem(
|
||||
key: null
|
||||
value: Scalar_String(
|
||||
value: Test
|
||||
)
|
||||
byRef: false
|
||||
)
|
||||
1: Expr_ArrayItem(
|
||||
key: null
|
||||
value: Scalar_String(
|
||||
value: Test
|
||||
comments: array(
|
||||
0: // Value here is wrong
|
||||
)
|
||||
)
|
||||
byRef: false
|
||||
comments: array(
|
||||
0: // Value here is wrong
|
||||
)
|
||||
)
|
||||
)
|
||||
)
|
||||
)
|
||||
)
|
||||
)
|
||||
Loading…
Reference in New Issue
Block a user