mirror of
https://github.com/danog/psalm.git
synced 2024-12-14 10:17:33 +01:00
792 lines
21 KiB
PHP
792 lines
21 KiB
PHP
<?php
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namespace Psalm;
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use Psalm\Config;
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use Psalm\Internal\Analyzer\StatementsAnalyzer;
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use Psalm\Internal\Clause;
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use Psalm\Storage\FunctionLikeStorage;
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use Psalm\Type\Reconciler;
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use Psalm\Type;
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use Psalm\Type\Union;
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class Context
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{
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/**
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* @var array<string, Type\Union>
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*/
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public $vars_in_scope = [];
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/**
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* @var array<string, bool>
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*/
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public $vars_possibly_in_scope = [];
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/**
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* Whether or not we're inside the conditional of an if/where etc.
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*
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* This changes whether or not the context is cloned
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*
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* @var bool
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*/
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public $inside_conditional = false;
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/**
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* Whether or not we're inside a __construct function
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*
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* @var bool
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*/
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public $inside_constructor = false;
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/**
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* Whether or not we're inside an isset call
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*
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* Inside isssets Psalm is more lenient about certain things
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*
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* @var bool
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*/
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public $inside_isset = false;
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/**
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* Whether or not we're inside an unset call, where
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* we don't care about possibly undefined variables
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*
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* @var bool
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*/
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public $inside_unset = false;
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/**
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* Whether or not we're inside an class_exists call, where
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* we don't care about possibly undefined classes
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*
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* @var bool
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*/
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public $inside_class_exists = false;
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/**
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* Whether or not we're inside a function/method call
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*
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* @var bool
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*/
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public $inside_call = false;
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/**
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* @var null|CodeLocation
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*/
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public $include_location = null;
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/**
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* @var string|null
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*/
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public $self;
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/**
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* @var string|null
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*/
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public $parent;
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/**
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* @var bool
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*/
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public $check_classes = true;
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/**
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* @var bool
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*/
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public $check_variables = true;
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/**
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* @var bool
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*/
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public $check_methods = true;
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/**
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* @var bool
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*/
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public $check_consts = true;
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/**
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* @var bool
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*/
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public $check_functions = true;
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/**
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* A list of classes checked with class_exists
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*
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* @var array<string,bool>
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*/
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public $phantom_classes = [];
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/**
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* A list of files checked with file_exists
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*
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* @var array<string,bool>
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*/
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public $phantom_files = [];
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/**
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* A list of clauses in Conjunctive Normal Form
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*
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* @var array<int, Clause>
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*/
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public $clauses = [];
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/**
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* Whether or not to do a deep analysis and collect mutations to this context
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*
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* @var bool
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*/
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public $collect_mutations = false;
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/**
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* Whether or not to do a deep analysis and collect initializations from private methods
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*
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* @var bool
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*/
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public $collect_initializations = false;
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/**
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* Stored to prevent re-analysing methods when checking for initialised properties
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*
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* @var array<string, bool>|null
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*/
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public $initialized_methods = null;
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/**
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* @var array<string, Type\Union>
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*/
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public $constants = [];
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/**
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* Whether or not to track how many times a variable is used
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*
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* @var bool
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*/
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public $collect_references = false;
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/**
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* Whether or not to track exceptions
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*
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* @var bool
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*/
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public $collect_exceptions = false;
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/**
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* A list of variables that have been referenced
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*
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* @var array<string, bool>
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*/
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public $referenced_var_ids = [];
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/**
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* A list of variables that have never been referenced
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*
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* @var array<string, array<string, CodeLocation>>
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*/
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public $unreferenced_vars = [];
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/**
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* A list of variables that have been passed by reference (where we know their type)
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*
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* @var array<string, \Psalm\Internal\ReferenceConstraint>|null
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*/
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public $byref_constraints;
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/**
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* If this context inherits from a context, it is here
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*
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* @var Context|null
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*/
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public $parent_context;
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/**
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* @var array<string, Type\Union>
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*/
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public $possible_param_types = [];
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/**
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* A list of vars that have been assigned to
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*
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* @var array<string, bool>
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*/
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public $assigned_var_ids = [];
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/**
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* A list of vars that have been may have been assigned to
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*
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* @var array<string, bool>
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*/
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public $possibly_assigned_var_ids = [];
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/**
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* A list of classes or interfaces that may have been thrown
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*
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* @var array<string, array<array-key, CodeLocation>>
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*/
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public $possibly_thrown_exceptions = [];
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/**
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* @var bool
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*/
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public $is_global = false;
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/**
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* @var array<string, bool>
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*/
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public $protected_var_ids = [];
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/**
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* If we've branched from the main scope, a byte offset for where that branch happened
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*
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* @var int|null
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*/
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public $branch_point;
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/**
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* If we're inside case statements we allow continue; statements as an alias of break;
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*
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* @var bool
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*/
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public $inside_case = false;
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/**
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* @var bool
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*/
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public $inside_loop = false;
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/**
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* @var Internal\Scope\LoopScope|null
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*/
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public $loop_scope = null;
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/**
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* @var Internal\Scope\CaseScope|null
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*/
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public $case_scope = null;
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/**
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* @var bool
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*/
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public $strict_types = false;
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/**
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* @var string|null
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*/
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public $calling_method_id;
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/**
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* @var bool
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*/
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public $inside_negation = false;
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/**
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* @var bool
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*/
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public $ignore_variable_property = false;
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/**
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* @var bool
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*/
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public $ignore_variable_method = false;
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/**
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* @param string|null $self
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*/
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public function __construct($self = null)
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{
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$this->self = $self;
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}
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/**
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* @return void
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*/
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public function __clone()
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{
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foreach ($this->clauses as &$clause) {
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$clause = clone $clause;
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}
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foreach ($this->constants as &$constant) {
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$constant = clone $constant;
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}
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}
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/**
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* Updates the parent context, looking at the changes within a block and then applying those changes, where
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* necessary, to the parent context
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*
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* @param Context $start_context
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* @param Context $end_context
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* @param bool $has_leaving_statements whether or not the parent scope is abandoned between
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* $start_context and $end_context
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* @param array $vars_to_update
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* @param array $updated_vars
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*
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* @return void
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*/
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public function update(
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Context $start_context,
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Context $end_context,
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$has_leaving_statements,
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array $vars_to_update,
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array &$updated_vars
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) {
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foreach ($start_context->vars_in_scope as $var_id => $old_type) {
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// this is only true if there was some sort of type negation
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if (in_array($var_id, $vars_to_update, true)) {
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// if we're leaving, we're effectively deleting the possibility of the if types
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$new_type = !$has_leaving_statements && $end_context->hasVariable($var_id)
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? $end_context->vars_in_scope[$var_id]
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: null;
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$existing_type = isset($this->vars_in_scope[$var_id]) ? $this->vars_in_scope[$var_id] : null;
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if (!$existing_type) {
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if ($new_type) {
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$this->vars_in_scope[$var_id] = clone $new_type;
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$updated_vars[$var_id] = true;
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}
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continue;
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}
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$existing_type = clone $existing_type;
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// if the type changed within the block of statements, process the replacement
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// also never allow ourselves to remove all types from a union
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if ((!$new_type || !$old_type->equals($new_type))
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&& ($new_type || count($existing_type->getTypes()) > 1)
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) {
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$existing_type->substitute($old_type, $new_type);
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if ($new_type && $new_type->from_docblock) {
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$existing_type->setFromDocblock();
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}
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$updated_vars[$var_id] = true;
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}
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$this->vars_in_scope[$var_id] = $existing_type;
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}
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}
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}
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/**
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* @param array<string, Type\Union> $new_vars_in_scope
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* @param bool $include_new_vars
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*
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* @return array<string,Type\Union>
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*/
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public function getRedefinedVars(array $new_vars_in_scope, $include_new_vars = false)
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{
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$redefined_vars = [];
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foreach ($this->vars_in_scope as $var_id => $this_type) {
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if (!isset($new_vars_in_scope[$var_id])) {
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if ($include_new_vars) {
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$redefined_vars[$var_id] = $this_type;
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}
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continue;
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}
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$new_type = $new_vars_in_scope[$var_id];
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if (!$this_type->failed_reconciliation
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&& !$this_type->isEmpty()
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&& !$new_type->isEmpty()
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&& !$this_type->equals($new_type)
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) {
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$redefined_vars[$var_id] = $this_type;
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}
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}
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return $redefined_vars;
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}
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/**
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* @param Context $original_context
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* @param Context $new_context
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*
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* @return array<int, string>
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*/
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public static function getNewOrUpdatedVarIds(Context $original_context, Context $new_context)
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{
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$redefined_var_ids = [];
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foreach ($new_context->vars_in_scope as $var_id => $context_type) {
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if (!isset($original_context->vars_in_scope[$var_id])
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|| !$original_context->vars_in_scope[$var_id]->equals($context_type)
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) {
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$redefined_var_ids[] = $var_id;
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}
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}
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return $redefined_var_ids;
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}
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/**
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* @param string $remove_var_id
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*
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* @return void
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*/
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public function remove($remove_var_id)
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{
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unset(
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$this->referenced_var_ids[$remove_var_id],
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$this->vars_possibly_in_scope[$remove_var_id]
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);
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if (isset($this->vars_in_scope[$remove_var_id])) {
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$existing_type = $this->vars_in_scope[$remove_var_id];
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unset($this->vars_in_scope[$remove_var_id]);
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$this->removeDescendents($remove_var_id, $existing_type);
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}
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}
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/**
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* @param string[] $changed_var_ids
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*
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* @return void
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*/
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public function removeReconciledClauses(array $changed_var_ids)
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{
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$this->clauses = array_filter(
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$this->clauses,
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/** @return bool */
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function (Clause $c) use ($changed_var_ids) {
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if ($c->wedge) {
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return true;
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}
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foreach ($c->possibilities as $key => $_) {
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if (in_array($key, $changed_var_ids, true)) {
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return false;
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}
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}
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return true;
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}
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);
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}
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/**
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* @param string $remove_var_id
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* @param Clause[] $clauses
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* @param Union|null $new_type
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* @param StatementsAnalyzer|null $statements_analyzer
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*
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* @return array<int, Clause>
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*/
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public static function filterClauses(
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$remove_var_id,
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array $clauses,
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Union $new_type = null,
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StatementsAnalyzer $statements_analyzer = null
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) {
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$new_type_string = $new_type ? $new_type->getId() : '';
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$clauses_to_keep = [];
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foreach ($clauses as $clause) {
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\Psalm\Type\Algebra::calculateNegation($clause);
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$quoted_remove_var_id = preg_quote($remove_var_id, '/');
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foreach ($clause->possibilities as $var_id => $_) {
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if (preg_match('/' . $quoted_remove_var_id . '[\]\[\-]/', $var_id)) {
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break 2;
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}
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}
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if (!isset($clause->possibilities[$remove_var_id]) ||
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$clause->possibilities[$remove_var_id] === [$new_type_string]
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) {
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$clauses_to_keep[] = $clause;
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} elseif ($statements_analyzer &&
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$new_type &&
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!$new_type->hasMixed()
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) {
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$type_changed = false;
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// if the clause contains any possibilities that would be altered
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// by the new type
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foreach ($clause->possibilities[$remove_var_id] as $type) {
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// empty and !empty are not definitive for arrays and scalar types
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if (($type === '!falsy' || $type === 'falsy') &&
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($new_type->hasArray() || $new_type->hasPossiblyNumericType())
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) {
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$type_changed = true;
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break;
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}
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$result_type = Reconciler::reconcileTypes(
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$type,
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clone $new_type,
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null,
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$statements_analyzer,
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false,
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[],
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null,
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[],
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$failed_reconciliation
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);
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if ($result_type->getId() !== $new_type_string) {
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$type_changed = true;
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break;
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}
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}
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if (!$type_changed) {
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$clauses_to_keep[] = $clause;
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}
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}
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}
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return $clauses_to_keep;
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}
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/**
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* @param string $remove_var_id
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* @param Union|null $new_type
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* @param null|StatementsAnalyzer $statements_analyzer
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*
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* @return void
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*/
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public function removeVarFromConflictingClauses(
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$remove_var_id,
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Union $new_type = null,
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StatementsAnalyzer $statements_analyzer = null
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) {
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$this->clauses = self::filterClauses($remove_var_id, $this->clauses, $new_type, $statements_analyzer);
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if ($this->parent_context) {
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$this->parent_context->removeVarFromConflictingClauses($remove_var_id);
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}
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}
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/**
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* @param string $remove_var_id
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* @param \Psalm\Type\Union|null $existing_type
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* @param \Psalm\Type\Union|null $new_type
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* @param null|StatementsAnalyzer $statements_analyzer
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*
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* @return void
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*/
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public function removeDescendents(
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$remove_var_id,
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Union $existing_type = null,
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Union $new_type = null,
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StatementsAnalyzer $statements_analyzer = null
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) {
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if (!$existing_type && isset($this->vars_in_scope[$remove_var_id])) {
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$existing_type = $this->vars_in_scope[$remove_var_id];
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}
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if (!$existing_type) {
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return;
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}
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if ($this->clauses) {
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$this->removeVarFromConflictingClauses(
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$remove_var_id,
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$existing_type->hasMixed()
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|| ($new_type && $existing_type->from_docblock !== $new_type->from_docblock)
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? null
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: $new_type,
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$statements_analyzer
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);
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}
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$vars_to_remove = [];
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foreach ($this->vars_in_scope as $var_id => $_) {
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if (preg_match('/' . preg_quote($remove_var_id, '/') . '[\]\[\-]/', $var_id)) {
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$vars_to_remove[] = $var_id;
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}
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}
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|
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foreach ($vars_to_remove as $var_id) {
|
|
unset($this->vars_in_scope[$var_id]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return void
|
|
*/
|
|
public function removeAllObjectVars()
|
|
{
|
|
$vars_to_remove = [];
|
|
|
|
foreach ($this->vars_in_scope as $var_id => $_) {
|
|
if (strpos($var_id, '->') !== false || strpos($var_id, '::') !== false) {
|
|
$vars_to_remove[] = $var_id;
|
|
}
|
|
}
|
|
|
|
if (!$vars_to_remove) {
|
|
return;
|
|
}
|
|
|
|
foreach ($vars_to_remove as $var_id) {
|
|
unset($this->vars_in_scope[$var_id], $this->vars_possibly_in_scope[$var_id]);
|
|
}
|
|
|
|
$clauses_to_keep = [];
|
|
|
|
foreach ($this->clauses as $clause) {
|
|
$abandon_clause = false;
|
|
|
|
foreach (array_keys($clause->possibilities) as $key) {
|
|
if (strpos($key, '->') !== false || strpos($key, '::') !== false) {
|
|
$abandon_clause = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!$abandon_clause) {
|
|
$clauses_to_keep[] = $clause;
|
|
}
|
|
}
|
|
|
|
$this->clauses = $clauses_to_keep;
|
|
}
|
|
|
|
/**
|
|
* @param Context $op_context
|
|
*
|
|
* @return void
|
|
*/
|
|
public function updateChecks(Context $op_context)
|
|
{
|
|
$this->check_classes = $this->check_classes && $op_context->check_classes;
|
|
$this->check_variables = $this->check_variables && $op_context->check_variables;
|
|
$this->check_methods = $this->check_methods && $op_context->check_methods;
|
|
$this->check_functions = $this->check_functions && $op_context->check_functions;
|
|
$this->check_consts = $this->check_consts && $op_context->check_consts;
|
|
}
|
|
|
|
/**
|
|
* @param string $class_name
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function isPhantomClass($class_name)
|
|
{
|
|
return isset($this->phantom_classes[strtolower($class_name)]);
|
|
}
|
|
|
|
/**
|
|
* @param string|null $var_name
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function hasVariable($var_name, StatementsAnalyzer $statements_analyzer = null)
|
|
{
|
|
if (!$var_name) {
|
|
return false;
|
|
}
|
|
|
|
$stripped_var = preg_replace('/(->|\[).*$/', '', $var_name);
|
|
|
|
if ($stripped_var[0] === '$' && ($stripped_var !== '$this' || $var_name !== $stripped_var)) {
|
|
$this->referenced_var_ids[$var_name] = true;
|
|
|
|
if (!isset($this->vars_possibly_in_scope[$var_name])
|
|
&& !isset($this->vars_in_scope[$var_name])
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
if ($this->collect_references && $statements_analyzer) {
|
|
if (isset($this->unreferenced_vars[$var_name])) {
|
|
$statements_analyzer->registerVariableUses($this->unreferenced_vars[$var_name]);
|
|
}
|
|
|
|
unset($this->unreferenced_vars[$var_name]);
|
|
}
|
|
}
|
|
|
|
return isset($this->vars_in_scope[$var_name]);
|
|
}
|
|
|
|
public function getScopeSummary() : string
|
|
{
|
|
$summary = [];
|
|
foreach ($this->vars_possibly_in_scope as $k => $_) {
|
|
$summary[$k] = true;
|
|
}
|
|
foreach ($this->vars_in_scope as $k => $v) {
|
|
$summary[$k] = $v->getId();
|
|
}
|
|
return json_encode($summary);
|
|
}
|
|
|
|
/**
|
|
* @return void
|
|
*/
|
|
public function defineGlobals()
|
|
{
|
|
$globals = [
|
|
'$argv' => new Type\Union([
|
|
new Type\Atomic\TArray([Type::getInt(), Type::getString()]),
|
|
]),
|
|
'$argc' => Type::getInt(),
|
|
];
|
|
|
|
$config = Config::getInstance();
|
|
|
|
foreach ($config->globals as $global_id => $type_string) {
|
|
$globals[$global_id] = Type::parseString($type_string);
|
|
}
|
|
|
|
foreach ($globals as $global_id => $type) {
|
|
$this->vars_in_scope[$global_id] = $type;
|
|
$this->vars_possibly_in_scope[$global_id] = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return void
|
|
*/
|
|
public function mergeExceptions(Context $other_context)
|
|
{
|
|
foreach ($other_context->possibly_thrown_exceptions as $possibly_thrown_exception => $codelocations) {
|
|
foreach ($codelocations as $hash => $codelocation) {
|
|
$this->possibly_thrown_exceptions[$possibly_thrown_exception][$hash] = $codelocation;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return bool
|
|
*/
|
|
public function isSuppressingExceptions(StatementsAnalyzer $statements_analyzer)
|
|
{
|
|
if (!$this->collect_exceptions) {
|
|
return true;
|
|
}
|
|
|
|
$issue_type = $this->is_global ? 'UncaughtThrowInGlobalScope' : 'MissingThrowsDocblock';
|
|
$suppressed_issues = $statements_analyzer->getSuppressedIssues();
|
|
if (in_array($issue_type, $suppressed_issues, true)) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @return void
|
|
*/
|
|
public function mergeFunctionExceptions(
|
|
FunctionLikeStorage $function_storage,
|
|
CodeLocation $codelocation
|
|
) {
|
|
$hash = $codelocation->getHash();
|
|
foreach ($function_storage->throws as $possibly_thrown_exception => $_) {
|
|
$this->possibly_thrown_exceptions[$possibly_thrown_exception][$hash] = $codelocation;
|
|
}
|
|
}
|
|
}
|