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rOACCT Open Access Compliance Check Tool (OACCT)
referencer.js
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/*
Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
"use strict"
;
/* eslint-disable no-underscore-dangle */
/* eslint-disable no-undefined */
const
Syntax
=
require
(
"estraverse"
).
Syntax
;
const
esrecurse
=
require
(
"esrecurse"
);
const
Reference
=
require
(
"./reference"
);
const
Variable
=
require
(
"./variable"
);
const
PatternVisitor
=
require
(
"./pattern-visitor"
);
const
definition
=
require
(
"./definition"
);
const
assert
=
require
(
"assert"
);
const
ParameterDefinition
=
definition
.
ParameterDefinition
;
const
Definition
=
definition
.
Definition
;
/**
* Traverse identifier in pattern
* @param {Object} options - options
* @param {pattern} rootPattern - root pattern
* @param {Refencer} referencer - referencer
* @param {callback} callback - callback
* @returns {void}
*/
function
traverseIdentifierInPattern
(
options
,
rootPattern
,
referencer
,
callback
)
{
// Call the callback at left hand identifier nodes, and Collect right hand nodes.
const
visitor
=
new
PatternVisitor
(
options
,
rootPattern
,
callback
);
visitor
.
visit
(
rootPattern
);
// Process the right hand nodes recursively.
if
(
referencer
!==
null
&&
referencer
!==
undefined
)
{
visitor
.
rightHandNodes
.
forEach
(
referencer
.
visit
,
referencer
);
}
}
// Importing ImportDeclaration.
// http://people.mozilla.org/~jorendorff/es6-draft.html#sec-moduledeclarationinstantiation
// https://github.com/estree/estree/blob/master/es6.md#importdeclaration
// FIXME: Now, we don't create module environment, because the context is
// implementation dependent.
class
Importer
extends
esrecurse
.
Visitor
{
constructor
(
declaration
,
referencer
)
{
super
(
null
,
referencer
.
options
);
this
.
declaration
=
declaration
;
this
.
referencer
=
referencer
;
}
visitImport
(
id
,
specifier
)
{
this
.
referencer
.
visitPattern
(
id
,
pattern
=>
{
this
.
referencer
.
currentScope
().
__define
(
pattern
,
new
Definition
(
Variable
.
ImportBinding
,
pattern
,
specifier
,
this
.
declaration
,
null
,
null
));
});
}
ImportNamespaceSpecifier
(
node
)
{
const
local
=
(
node
.
local
||
node
.
id
);
if
(
local
)
{
this
.
visitImport
(
local
,
node
);
}
}
ImportDefaultSpecifier
(
node
)
{
const
local
=
(
node
.
local
||
node
.
id
);
this
.
visitImport
(
local
,
node
);
}
ImportSpecifier
(
node
)
{
const
local
=
(
node
.
local
||
node
.
id
);
if
(
node
.
name
)
{
this
.
visitImport
(
node
.
name
,
node
);
}
else
{
this
.
visitImport
(
local
,
node
);
}
}
}
// Referencing variables and creating bindings.
class
Referencer
extends
esrecurse
.
Visitor
{
constructor
(
options
,
scopeManager
)
{
super
(
null
,
options
);
this
.
options
=
options
;
this
.
scopeManager
=
scopeManager
;
this
.
parent
=
null
;
this
.
isInnerMethodDefinition
=
false
;
}
currentScope
()
{
return
this
.
scopeManager
.
__currentScope
;
}
close
(
node
)
{
while
(
this
.
currentScope
()
&&
node
===
this
.
currentScope
().
block
)
{
this
.
scopeManager
.
__currentScope
=
this
.
currentScope
().
__close
(
this
.
scopeManager
);
}
}
pushInnerMethodDefinition
(
isInnerMethodDefinition
)
{
const
previous
=
this
.
isInnerMethodDefinition
;
this
.
isInnerMethodDefinition
=
isInnerMethodDefinition
;
return
previous
;
}
popInnerMethodDefinition
(
isInnerMethodDefinition
)
{
this
.
isInnerMethodDefinition
=
isInnerMethodDefinition
;
}
referencingDefaultValue
(
pattern
,
assignments
,
maybeImplicitGlobal
,
init
)
{
const
scope
=
this
.
currentScope
();
assignments
.
forEach
(
assignment
=>
{
scope
.
__referencing
(
pattern
,
Reference
.
WRITE
,
assignment
.
right
,
maybeImplicitGlobal
,
pattern
!==
assignment
.
left
,
init
);
});
}
visitPattern
(
node
,
options
,
callback
)
{
let
visitPatternOptions
=
options
;
let
visitPatternCallback
=
callback
;
if
(
typeof
options
===
"function"
)
{
visitPatternCallback
=
options
;
visitPatternOptions
=
{
processRightHandNodes
:
false
};
}
traverseIdentifierInPattern
(
this
.
options
,
node
,
visitPatternOptions
.
processRightHandNodes
?
this
:
null
,
visitPatternCallback
);
}
visitFunction
(
node
)
{
let
i
,
iz
;
// FunctionDeclaration name is defined in upper scope
// NOTE: Not referring variableScope. It is intended.
// Since
// in ES5, FunctionDeclaration should be in FunctionBody.
// in ES6, FunctionDeclaration should be block scoped.
if
(
node
.
type
===
Syntax
.
FunctionDeclaration
)
{
// id is defined in upper scope
this
.
currentScope
().
__define
(
node
.
id
,
new
Definition
(
Variable
.
FunctionName
,
node
.
id
,
node
,
null
,
null
,
null
));
}
// FunctionExpression with name creates its special scope;
// FunctionExpressionNameScope.
if
(
node
.
type
===
Syntax
.
FunctionExpression
&&
node
.
id
)
{
this
.
scopeManager
.
__nestFunctionExpressionNameScope
(
node
);
}
// Consider this function is in the MethodDefinition.
this
.
scopeManager
.
__nestFunctionScope
(
node
,
this
.
isInnerMethodDefinition
);
const
that
=
this
;
/**
* Visit pattern callback
* @param {pattern} pattern - pattern
* @param {Object} info - info
* @returns {void}
*/
function
visitPatternCallback
(
pattern
,
info
)
{
that
.
currentScope
().
__define
(
pattern
,
new
ParameterDefinition
(
pattern
,
node
,
i
,
info
.
rest
));
that
.
referencingDefaultValue
(
pattern
,
info
.
assignments
,
null
,
true
);
}
// Process parameter declarations.
for
(
i
=
0
,
iz
=
node
.
params
.
length
;
i
<
iz
;
++
i
)
{
this
.
visitPattern
(
node
.
params
[
i
],
{
processRightHandNodes
:
true
},
visitPatternCallback
);
}
// if there's a rest argument, add that
if
(
node
.
rest
)
{
this
.
visitPattern
({
type
:
"RestElement"
,
argument
:
node
.
rest
},
pattern
=>
{
this
.
currentScope
().
__define
(
pattern
,
new
ParameterDefinition
(
pattern
,
node
,
node
.
params
.
length
,
true
));
});
}
// In TypeScript there are a number of function-like constructs which have no body,
// so check it exists before traversing
if
(
node
.
body
)
{
// Skip BlockStatement to prevent creating BlockStatement scope.
if
(
node
.
body
.
type
===
Syntax
.
BlockStatement
)
{
this
.
visitChildren
(
node
.
body
);
}
else
{
this
.
visit
(
node
.
body
);
}
}
this
.
close
(
node
);
}
visitClass
(
node
)
{
if
(
node
.
type
===
Syntax
.
ClassDeclaration
)
{
this
.
currentScope
().
__define
(
node
.
id
,
new
Definition
(
Variable
.
ClassName
,
node
.
id
,
node
,
null
,
null
,
null
));
}
this
.
visit
(
node
.
superClass
);
this
.
scopeManager
.
__nestClassScope
(
node
);
if
(
node
.
id
)
{
this
.
currentScope
().
__define
(
node
.
id
,
new
Definition
(
Variable
.
ClassName
,
node
.
id
,
node
));
}
this
.
visit
(
node
.
body
);
this
.
close
(
node
);
}
visitProperty
(
node
)
{
let
previous
;
if
(
node
.
computed
)
{
this
.
visit
(
node
.
key
);
}
const
isMethodDefinition
=
node
.
type
===
Syntax
.
MethodDefinition
;
if
(
isMethodDefinition
)
{
previous
=
this
.
pushInnerMethodDefinition
(
true
);
}
this
.
visit
(
node
.
value
);
if
(
isMethodDefinition
)
{
this
.
popInnerMethodDefinition
(
previous
);
}
}
visitForIn
(
node
)
{
if
(
node
.
left
.
type
===
Syntax
.
VariableDeclaration
&&
node
.
left
.
kind
!==
"var"
)
{
this
.
scopeManager
.
__nestForScope
(
node
);
}
if
(
node
.
left
.
type
===
Syntax
.
VariableDeclaration
)
{
this
.
visit
(
node
.
left
);
this
.
visitPattern
(
node
.
left
.
declarations
[
0
].
id
,
pattern
=>
{
this
.
currentScope
().
__referencing
(
pattern
,
Reference
.
WRITE
,
node
.
right
,
null
,
true
,
true
);
});
}
else
{
this
.
visitPattern
(
node
.
left
,
{
processRightHandNodes
:
true
},
(
pattern
,
info
)
=>
{
let
maybeImplicitGlobal
=
null
;
if
(
!
this
.
currentScope
().
isStrict
)
{
maybeImplicitGlobal
=
{
pattern
,
node
};
}
this
.
referencingDefaultValue
(
pattern
,
info
.
assignments
,
maybeImplicitGlobal
,
false
);
this
.
currentScope
().
__referencing
(
pattern
,
Reference
.
WRITE
,
node
.
right
,
maybeImplicitGlobal
,
true
,
false
);
});
}
this
.
visit
(
node
.
right
);
this
.
visit
(
node
.
body
);
this
.
close
(
node
);
}
visitVariableDeclaration
(
variableTargetScope
,
type
,
node
,
index
)
{
const
decl
=
node
.
declarations
[
index
];
const
init
=
decl
.
init
;
this
.
visitPattern
(
decl
.
id
,
{
processRightHandNodes
:
true
},
(
pattern
,
info
)
=>
{
variableTargetScope
.
__define
(
pattern
,
new
Definition
(
type
,
pattern
,
decl
,
node
,
index
,
node
.
kind
)
);
this
.
referencingDefaultValue
(
pattern
,
info
.
assignments
,
null
,
true
);
if
(
init
)
{
this
.
currentScope
().
__referencing
(
pattern
,
Reference
.
WRITE
,
init
,
null
,
!
info
.
topLevel
,
true
);
}
});
}
AssignmentExpression
(
node
)
{
if
(
PatternVisitor
.
isPattern
(
node
.
left
))
{
if
(
node
.
operator
===
"="
)
{
this
.
visitPattern
(
node
.
left
,
{
processRightHandNodes
:
true
},
(
pattern
,
info
)
=>
{
let
maybeImplicitGlobal
=
null
;
if
(
!
this
.
currentScope
().
isStrict
)
{
maybeImplicitGlobal
=
{
pattern
,
node
};
}
this
.
referencingDefaultValue
(
pattern
,
info
.
assignments
,
maybeImplicitGlobal
,
false
);
this
.
currentScope
().
__referencing
(
pattern
,
Reference
.
WRITE
,
node
.
right
,
maybeImplicitGlobal
,
!
info
.
topLevel
,
false
);
});
}
else
{
this
.
currentScope
().
__referencing
(
node
.
left
,
Reference
.
RW
,
node
.
right
);
}
}
else
{
this
.
visit
(
node
.
left
);
}
this
.
visit
(
node
.
right
);
}
CatchClause
(
node
)
{
this
.
scopeManager
.
__nestCatchScope
(
node
);
this
.
visitPattern
(
node
.
param
,
{
processRightHandNodes
:
true
},
(
pattern
,
info
)
=>
{
this
.
currentScope
().
__define
(
pattern
,
new
Definition
(
Variable
.
CatchClause
,
node
.
param
,
node
,
null
,
null
,
null
));
this
.
referencingDefaultValue
(
pattern
,
info
.
assignments
,
null
,
true
);
});
this
.
visit
(
node
.
body
);
this
.
close
(
node
);
}
Program
(
node
)
{
this
.
scopeManager
.
__nestGlobalScope
(
node
);
if
(
this
.
scopeManager
.
__isNodejsScope
())
{
// Force strictness of GlobalScope to false when using node.js scope.
this
.
currentScope
().
isStrict
=
false
;
this
.
scopeManager
.
__nestFunctionScope
(
node
,
false
);
}
if
(
this
.
scopeManager
.
__isES6
()
&&
this
.
scopeManager
.
isModule
())
{
this
.
scopeManager
.
__nestModuleScope
(
node
);
}
if
(
this
.
scopeManager
.
isStrictModeSupported
()
&&
this
.
scopeManager
.
isImpliedStrict
())
{
this
.
currentScope
().
isStrict
=
true
;
}
this
.
visitChildren
(
node
);
this
.
close
(
node
);
}
Identifier
(
node
)
{
this
.
currentScope
().
__referencing
(
node
);
}
UpdateExpression
(
node
)
{
if
(
PatternVisitor
.
isPattern
(
node
.
argument
))
{
this
.
currentScope
().
__referencing
(
node
.
argument
,
Reference
.
RW
,
null
);
}
else
{
this
.
visitChildren
(
node
);
}
}
MemberExpression
(
node
)
{
this
.
visit
(
node
.
object
);
if
(
node
.
computed
)
{
this
.
visit
(
node
.
property
);
}
}
Property
(
node
)
{
this
.
visitProperty
(
node
);
}
MethodDefinition
(
node
)
{
this
.
visitProperty
(
node
);
}
BreakStatement
()
{}
// eslint-disable-line class-methods-use-this
ContinueStatement
()
{}
// eslint-disable-line class-methods-use-this
LabeledStatement
(
node
)
{
this
.
visit
(
node
.
body
);
}
ForStatement
(
node
)
{
// Create ForStatement declaration.
// NOTE: In ES6, ForStatement dynamically generates
// per iteration environment. However, escope is
// a static analyzer, we only generate one scope for ForStatement.
if
(
node
.
init
&&
node
.
init
.
type
===
Syntax
.
VariableDeclaration
&&
node
.
init
.
kind
!==
"var"
)
{
this
.
scopeManager
.
__nestForScope
(
node
);
}
this
.
visitChildren
(
node
);
this
.
close
(
node
);
}
ClassExpression
(
node
)
{
this
.
visitClass
(
node
);
}
ClassDeclaration
(
node
)
{
this
.
visitClass
(
node
);
}
CallExpression
(
node
)
{
// Check this is direct call to eval
if
(
!
this
.
scopeManager
.
__ignoreEval
()
&&
node
.
callee
.
type
===
Syntax
.
Identifier
&&
node
.
callee
.
name
===
"eval"
)
{
// NOTE: This should be `variableScope`. Since direct eval call always creates Lexical environment and
// let / const should be enclosed into it. Only VariableDeclaration affects on the caller's environment.
this
.
currentScope
().
variableScope
.
__detectEval
();
}
this
.
visitChildren
(
node
);
}
BlockStatement
(
node
)
{
if
(
this
.
scopeManager
.
__isES6
())
{
this
.
scopeManager
.
__nestBlockScope
(
node
);
}
this
.
visitChildren
(
node
);
this
.
close
(
node
);
}
ThisExpression
()
{
this
.
currentScope
().
variableScope
.
__detectThis
();
}
WithStatement
(
node
)
{
this
.
visit
(
node
.
object
);
// Then nest scope for WithStatement.
this
.
scopeManager
.
__nestWithScope
(
node
);
this
.
visit
(
node
.
body
);
this
.
close
(
node
);
}
VariableDeclaration
(
node
)
{
const
variableTargetScope
=
(
node
.
kind
===
"var"
)
?
this
.
currentScope
().
variableScope
:
this
.
currentScope
();
for
(
let
i
=
0
,
iz
=
node
.
declarations
.
length
;
i
<
iz
;
++
i
)
{
const
decl
=
node
.
declarations
[
i
];
this
.
visitVariableDeclaration
(
variableTargetScope
,
Variable
.
Variable
,
node
,
i
);
if
(
decl
.
init
)
{
this
.
visit
(
decl
.
init
);
}
}
}
// sec 13.11.8
SwitchStatement
(
node
)
{
this
.
visit
(
node
.
discriminant
);
if
(
this
.
scopeManager
.
__isES6
())
{
this
.
scopeManager
.
__nestSwitchScope
(
node
);
}
for
(
let
i
=
0
,
iz
=
node
.
cases
.
length
;
i
<
iz
;
++
i
)
{
this
.
visit
(
node
.
cases
[
i
]);
}
this
.
close
(
node
);
}
FunctionDeclaration
(
node
)
{
this
.
visitFunction
(
node
);
}
FunctionExpression
(
node
)
{
this
.
visitFunction
(
node
);
}
ForOfStatement
(
node
)
{
this
.
visitForIn
(
node
);
}
ForInStatement
(
node
)
{
this
.
visitForIn
(
node
);
}
ArrowFunctionExpression
(
node
)
{
this
.
visitFunction
(
node
);
}
ImportDeclaration
(
node
)
{
assert
(
this
.
scopeManager
.
__isES6
()
&&
this
.
scopeManager
.
isModule
(),
"ImportDeclaration should appear when the mode is ES6 and in the module context."
);
const
importer
=
new
Importer
(
node
,
this
);
importer
.
visit
(
node
);
}
visitExportDeclaration
(
node
)
{
if
(
node
.
source
)
{
return
;
}
if
(
node
.
declaration
)
{
this
.
visit
(
node
.
declaration
);
return
;
}
this
.
visitChildren
(
node
);
}
// TODO: ExportDeclaration doesn't exist. for bc?
ExportDeclaration
(
node
)
{
this
.
visitExportDeclaration
(
node
);
}
ExportAllDeclaration
(
node
)
{
this
.
visitExportDeclaration
(
node
);
}
ExportDefaultDeclaration
(
node
)
{
this
.
visitExportDeclaration
(
node
);
}
ExportNamedDeclaration
(
node
)
{
this
.
visitExportDeclaration
(
node
);
}
ExportSpecifier
(
node
)
{
// TODO: `node.id` doesn't exist. for bc?
const
local
=
(
node
.
id
||
node
.
local
);
this
.
visit
(
local
);
}
MetaProperty
()
{
// eslint-disable-line class-methods-use-this
// do nothing.
}
}
module
.
exports
=
Referencer
;
/* vim: set sw=4 ts=4 et tw=80 : */
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