'use strict' ;
Object . defineProperty ( exports , "__esModule" , {
value : true
} ) ;
var _ createClass = function ( ) { function defineProperties ( target , props ) { for ( var i = 0 ; i < props . length ; i ++ ) { var descriptor = props [ i ] ; descriptor . enumerable = descriptor . enumerable || false ; descriptor . configurable = true ; if ( "value" in descriptor ) descriptor . writable = true ; Object . defineProperty ( target , descriptor . key , descriptor ) ; } } return function ( Constructor , protoProps , staticProps ) { if ( protoProps ) defineProperties ( Constructor . prototype , protoProps ) ; if ( staticProps ) defineProperties ( Constructor , staticProps ) ; return Constructor ; } ; } ( ) ;
var _ estraverse = require ( 'estraverse' ) ;
var _ esrecurse = require ( 'esrecurse' ) ;
var _ esrecurse2 = _ interopRequireDefault ( _ esrecurse ) ;
function _ interopRequireDefault ( obj ) { return obj && obj . __ esModule ? obj : { default : obj } ; }
function _ classCallCheck ( instance , Constructor ) { if ( ! ( instance instanceof Constructor ) ) { throw new TypeError ( "Cannot call a class as a function" ) ; } }
function _ possibleConstructorReturn ( self , call ) { if ( ! self ) { throw new ReferenceError ( "this hasn't been initialised - super() hasn't been called" ) ; } return call && ( typeof call === "object" || typeof call === "function" ) ? call : self ; }
function _ inherits ( subClass , superClass ) { if ( typeof superClass !== "function" && superClass !== null ) { throw new TypeError ( "Super expression must either be null or a function, not " + typeof superClass ) ; } subClass . prototype = Object . create ( superClass && superClass . prototype , { constructor : { value : subClass , enumerable : false , writable : true , configurable : true } } ) ; if ( superClass ) Object . setPrototypeOf ? Object . setPrototypeOf ( subClass , superClass ) : subClass . __ proto__ = superClass ; } / *
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 .
* /
function getLast ( xs ) {
return xs [ xs . length - 1 ] || null ;
}
var PatternVisitor = function ( _ esrecurse$Visitor ) {
_ inherits ( PatternVisitor , _ esrecurse$Visitor ) ;
_ createClass ( PatternVisitor , null , [ {
key : 'isPattern' ,
value : function isPattern ( node ) {
var nodeType = node . type ;
return nodeType === _ estraverse . Syntax . Identifier || nodeType === _ estraverse . Syntax . ObjectPattern || nodeType === _ estraverse . Syntax . ArrayPattern || nodeType === _ estraverse . Syntax . SpreadElement || nodeType === _ estraverse . Syntax . RestElement || nodeType === _ estraverse . Syntax . AssignmentPattern ;
}
} ] ) ;
function PatternVisitor ( options , rootPattern , callback ) {
_ classCallCheck ( this , PatternVisitor ) ;
var _ this = _ possibleConstructorReturn ( this , Object . getPrototypeOf ( PatternVisitor ) . call ( this , null , options ) ) ;
_ this . rootPattern = rootPattern ;
_ this . callback = callback ;
_ this . assignments = [ ] ;
_ this . rightHandNodes = [ ] ;
_ this . restElements = [ ] ;
return _ this ;
}
_ createClass ( PatternVisitor , [ {
key : 'Identifier' ,
value : function Identifier ( pattern ) {
var lastRestElement = getLast ( this . restElements ) ;
this . callback ( pattern , {
topLevel : pattern === this . rootPattern ,
rest : lastRestElement != null && lastRestElement . argument === pattern ,
assignments : this . assignments
} ) ;
}
} , {
key : 'Property' ,
value : function Property ( property ) {
// Computed property's key is a right hand node.
if ( property . computed ) {
this . rightHandNodes . push ( property . key ) ;
}
// If it's shorthand, its key is same as its value.
// If it's shorthand and has its default value, its key is same as its value.left (the value is AssignmentPattern).
// If it's not shorthand, the name of new variable is its value's.
this . visit ( property . value ) ;
}
} , {
key : 'ArrayPattern' ,
value : function ArrayPattern ( pattern ) {
var i , iz , element ;
for ( i = 0 , iz = pattern . elements . length ; i < iz ; ++ i ) {
element = pattern . elements [ i ] ;
this . visit ( element ) ;
}
}
} , {
key : 'AssignmentPattern' ,
value : function AssignmentPattern ( pattern ) {
this . assignments . push ( pattern ) ;
this . visit ( pattern . left ) ;
this . rightHandNodes . push ( pattern . right ) ;
this . assignments . pop ( ) ;
}
} , {
key : 'RestElement' ,
value : function RestElement ( pattern ) {
this . restElements . push ( pattern ) ;
this . visit ( pattern . argument ) ;
this . restElements . pop ( ) ;
}
} , {
key : 'MemberExpression' ,
value : function MemberExpression ( node ) {
// Computed property's key is a right hand node.
if ( node . computed ) {
this . rightHandNodes . push ( node . property ) ;
}
// the object is only read, write to its property.
this . rightHandNodes . push ( node . object ) ;
}
//
// ForInStatement.left and AssignmentExpression.left are LeftHandSideExpression.
// By spec, LeftHandSideExpression is Pattern or MemberExpression.
// (see also: https://github.com/estree/estree/pull/20#issuecomment-74584758)
// But espree 2.0 and esprima 2.0 parse to ArrayExpression, ObjectExpression, etc...
//
} , {
key : 'SpreadElement' ,
value : function SpreadElement ( node ) {
this . visit ( node . argument ) ;
}
} , {
key : 'ArrayExpression' ,
value : function ArrayExpression ( node ) {
node . elements . forEach ( this . visit , this ) ;
}
} , {
key : 'AssignmentExpression' ,
value : function AssignmentExpression ( node ) {
this . assignments . push ( node ) ;
this . visit ( node . left ) ;
this . rightHandNodes . push ( node . right ) ;
this . assignments . pop ( ) ;
}
} , {
key : 'CallExpression' ,
value : function CallExpression ( node ) {
var _ this2 = this ;
// arguments are right hand nodes.
node . arguments . forEach ( function ( a ) {
_ this2 . rightHandNodes . push ( a ) ;
} ) ;
this . visit ( node . callee ) ;
}
} ] ) ;
return PatternVisitor ;
} ( _ esrecurse2 . default . Visitor ) ;
/* vim: set sw=4 ts=4 et tw=80 : */
exports . default = PatternVisitor ;
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