93 lines
2.6 KiB
PHP
93 lines
2.6 KiB
PHP
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<?php
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declare(strict_types = 1);
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namespace LanguageServer;
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use Microsoft\PhpParser\Node\DelimitedList\ArgumentExpressionList;
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use Microsoft\PhpParser\Node\Expression\CallExpression;
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use LanguageServer\Index\ReadableIndex;
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use LanguageServer\Protocol\{
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Range,
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Position,
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SignatureHelp,
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SignatureInformation,
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ParameterInformation
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};
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class SignatureHelpProvider
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{
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/**
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* @var DefinitionResolver
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*/
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private $definitionResolver;
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/**
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* @var ReadableIndex
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*/
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private $index;
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/**
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* @param DefinitionResolver $definitionResolver
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* @param ReadableIndex $index
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*/
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public function __construct(DefinitionResolver $definitionResolver, ReadableIndex $index)
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{
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$this->definitionResolver = $definitionResolver;
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$this->index = $index;
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}
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/**
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* Returns signature help for a specific cursor position in a document
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*
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* @param PhpDocument $doc The opened document
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* @param Position $pos The cursor position
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* @return SignatureHelp
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*/
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public function provideSignature(PhpDocument $doc, Position $pos) : SignatureHelp
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{
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$node = $doc->getNodeAtPosition($pos);
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while ($node &&
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!($node instanceof ArgumentExpressionList) &&
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!($node instanceof CallExpression) &&
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$node->parent
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) {
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$node = $node->parent;
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}
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if (!($node instanceof ArgumentExpressionList) &&
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!($node instanceof CallExpression)
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) {
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return new SignatureHelp;
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}
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$count = 0;
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if ($node instanceof ArgumentExpressionList) {
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foreach ($node->getElements() as $param) {
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$count ++;
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}
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while ($node && !($node instanceof CallExpression) && $node->parent) {
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$node = $node->parent;
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}
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if (!($node instanceof CallExpression)) {
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return new SignatureHelp;
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}
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}
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$def = $this->definitionResolver->resolveReferenceNodeToDefinition($node->callableExpression);
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if (!$def) {
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return new SignatureHelp;
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}
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$params = array_map(function ($v) {
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return $v->label;
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}, $def->parameters);
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return new SignatureHelp(
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[
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new SignatureInformation(
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trim(str_replace(['public', 'protected', 'private', 'function', 'static'], '', $def->declarationLine)),
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$def->documentation,
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$def->parameters
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)
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],
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0,
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$count < count($def->parameters) ? $count : null
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);
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}
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}
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