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PhutilXHPASTSyntaxHighlighterFuture.php
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Created
Wed, May 22, 12:09

PhutilXHPASTSyntaxHighlighterFuture.php
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<?php
final class PhutilXHPASTSyntaxHighlighterFuture extends FutureProxy {
private $source;
private $scrub;
public function __construct(Future $proxied, $source, $scrub = false) {
parent::__construct($proxied);
$this->source = $source;
$this->scrub = $scrub;
}
protected function didReceiveResult($result) {
try {
return $this->applyXHPHighlight($result);
} catch (Exception $ex) {
// XHP can't highlight source that isn't syntactically valid. Fall back
// to the fragment lexer.
$source = ($this->scrub
? preg_replace('/^.*\n/', '', $this->source)
: $this->source);
return id(new PhutilLexerSyntaxHighlighter())
->setConfig('lexer', new PhutilPHPFragmentLexer())
->setConfig('language', 'php')
->getHighlightFuture($source)
->resolve();
}
}
private function applyXHPHighlight($result) {
// We perform two passes here: one using the AST to find symbols we care
// about -- particularly, class names and function names. These are used
// in the crossreference stuff to link into Diffusion. After we've done our
// AST pass, we do a followup pass on the token stream to catch all the
// simple stuff like strings and comments.
$tree = XHPASTTree::newFromDataAndResolvedExecFuture(
$this->source,
$result);
$root = $tree->getRootNode();
$tokens = $root->getTokens();
$interesting_symbols = $this->findInterestingSymbols($root);
if ($this->scrub) {
// If we're scrubbing, we prepended "<?php\n" to the text to force the
// highlighter to treat it as PHP source. Now, we need to remove that.
$ok = false;
if (count($tokens) >= 2) {
if ($tokens[0]->getTypeName() === 'T_OPEN_TAG') {
if ($tokens[1]->getTypeName() === 'T_WHITESPACE') {
$ok = true;
}
}
}
if (!$ok) {
throw new Exception(
pht(
'Expected T_OPEN_TAG, T_WHITESPACE tokens at head of results '.
'for highlighting parse of PHP snippet.'));
}
// Remove the "<?php".
unset($tokens[0]);
$value = $tokens[1]->getValue();
if ((strlen($value) < 1) || ($value[0] != "\n")) {
throw new Exception(
pht(
'Expected "\\n" at beginning of T_WHITESPACE token at head of '.
'tokens for highlighting parse of PHP snippet.'));
}
$value = substr($value, 1);
$tokens[1]->overwriteValue($value);
}
$out = array();
foreach ($tokens as $key => $token) {
$value = $token->getValue();
$class = null;
$multi = false;
$attrs = array();
if (isset($interesting_symbols[$key])) {
$sym = $interesting_symbols[$key];
$class = $sym[0];
$attrs['data-symbol-context'] = idx($sym, 'context');
$attrs['data-symbol-name'] = idx($sym, 'symbol');
} else {
switch ($token->getTypeName()) {
case 'T_WHITESPACE':
break;
case 'T_DOC_COMMENT':
$class = 'dc';
$multi = true;
break;
case 'T_COMMENT':
$class = 'c';
$multi = true;
break;
case 'T_CONSTANT_ENCAPSED_STRING':
case 'T_ENCAPSED_AND_WHITESPACE':
case 'T_INLINE_HTML':
$class = 's';
$multi = true;
break;
case 'T_VARIABLE':
$class = 'nv';
break;
case 'T_OPEN_TAG':
case 'T_OPEN_TAG_WITH_ECHO':
case 'T_CLOSE_TAG':
$class = 'o';
break;
case 'T_LNUMBER':
case 'T_DNUMBER':
$class = 'm';
break;
case 'T_STRING':
static $magic = array(
'true' => true,
'false' => true,
'null' => true,
);
if (isset($magic[strtolower($value)])) {
$class = 'k';
break;
}
$class = 'nx';
break;
default:
$class = 'k';
break;
}
}
if ($class) {
$attrs['class'] = $class;
if ($multi) {
// If the token may have multiple lines in it, make sure each
// <span> crosses no more than one line so the lines can be put
// in a table, etc., later.
$value = phutil_split_lines($value, $retain_endings = true);
} else {
$value = array($value);
}
foreach ($value as $val) {
$out[] = phutil_tag('span', $attrs, $val);
}
} else {
$out[] = $value;
}
}
return phutil_implode_html('', $out);
}
private function findInterestingSymbols(XHPASTNode $root) {
// Class name symbols appear in:
// class X extends X implements X, X { ... }
// new X();
// $x instanceof X
// catch (X $x)
// function f(X $x)
// X::f();
// X::$m;
// X::CONST;
// These are PHP builtin tokens which can appear in a classname context.
// Don't link them since they don't go anywhere useful.
static $builtin_class_tokens = array(
'self' => true,
'parent' => true,
'static' => true,
);
// Fortunately XHPAST puts all of these in a special node type so it's
// easy to find them.
$result_map = array();
$class_names = $root->selectDescendantsOfType('n_CLASS_NAME');
foreach ($class_names as $class_name) {
foreach ($class_name->getTokens() as $key => $token) {
if (isset($builtin_class_tokens[$token->getValue()])) {
// This is something like "self::method()".
continue;
}
$result_map[$key] = array(
'nc', // "Name, Class"
'symbol' => $class_name->getConcreteString(),
);
}
}
// Function name symbols appear in:
// f()
$function_calls = $root->selectDescendantsOfType('n_FUNCTION_CALL');
foreach ($function_calls as $call) {
$call = $call->getChildByIndex(0);
if ($call->getTypeName() == 'n_SYMBOL_NAME') {
// This is a normal function call, not some $f() shenanigans.
foreach ($call->getTokens() as $key => $token) {
$result_map[$key] = array(
'nf', // "Name, Function"
'symbol' => $call->getConcreteString(),
);
}
}
}
// Upon encountering $x->y, link y without context, since $x is unknown.
$prop_access = $root->selectDescendantsOfType('n_OBJECT_PROPERTY_ACCESS');
foreach ($prop_access as $access) {
$right = $access->getChildByIndex(1);
if ($right->getTypeName() == 'n_INDEX_ACCESS') {
// otherwise $x->y[0] doesn't get highlighted
$right = $right->getChildByIndex(0);
}
if ($right->getTypeName() == 'n_STRING') {
foreach ($right->getTokens() as $key => $token) {
$result_map[$key] = array(
'na', // "Name, Attribute"
'symbol' => $right->getConcreteString(),
);
}
}
}
// Upon encountering x::y, try to link y with context x.
$static_access = $root->selectDescendantsOfType('n_CLASS_STATIC_ACCESS');
foreach ($static_access as $access) {
$class = $access->getChildByIndex(0);
$right = $access->getChildByIndex(1);
if ($class->getTypeName() == 'n_CLASS_NAME' &&
($right->getTypeName() == 'n_STRING' ||
$right->getTypeName() == 'n_VARIABLE')) {
$classname = head($class->getTokens())->getValue();
$result = array(
'na',
'symbol' => ltrim($right->getConcreteString(), '$'),
);
if (!isset($builtin_class_tokens[$classname])) {
$result['context'] = $classname;
}
foreach ($right->getTokens() as $key => $token) {
$result_map[$key] = $result;
}
}
}
return $result_map;
}
}

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