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codeql-action/node_modules/eslint-scope/lib/pattern-visitor.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. | |
*/ | |
/* eslint-disable no-undefined */ | |
import estraverse from "estraverse"; | |
import esrecurse from "esrecurse"; | |
const { Syntax } = estraverse; | |
/** | |
* Get last array element | |
* @param {Array} xs array | |
* @returns {any} Last elment | |
*/ | |
function getLast(xs) { | |
return xs[xs.length - 1] || null; | |
} | |
class PatternVisitor extends esrecurse.Visitor { | |
static isPattern(node) { | |
const nodeType = node.type; | |
return ( | |
nodeType === Syntax.Identifier || | |
nodeType === Syntax.ObjectPattern || | |
nodeType === Syntax.ArrayPattern || | |
nodeType === Syntax.SpreadElement || | |
nodeType === Syntax.RestElement || | |
nodeType === Syntax.AssignmentPattern | |
); | |
} | |
constructor(options, rootPattern, callback) { | |
super(null, options); | |
this.rootPattern = rootPattern; | |
this.callback = callback; | |
this.assignments = []; | |
this.rightHandNodes = []; | |
this.restElements = []; | |
} | |
Identifier(pattern) { | |
const lastRestElement = getLast(this.restElements); | |
this.callback(pattern, { | |
topLevel: pattern === this.rootPattern, | |
rest: lastRestElement !== null && lastRestElement !== undefined && lastRestElement.argument === pattern, | |
assignments: this.assignments | |
}); | |
} | |
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); | |
} | |
ArrayPattern(pattern) { | |
for (let i = 0, iz = pattern.elements.length; i < iz; ++i) { | |
const element = pattern.elements[i]; | |
this.visit(element); | |
} | |
} | |
AssignmentPattern(pattern) { | |
this.assignments.push(pattern); | |
this.visit(pattern.left); | |
this.rightHandNodes.push(pattern.right); | |
this.assignments.pop(); | |
} | |
RestElement(pattern) { | |
this.restElements.push(pattern); | |
this.visit(pattern.argument); | |
this.restElements.pop(); | |
} | |
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 parses to ArrayExpression, ObjectExpression, etc... | |
// | |
SpreadElement(node) { | |
this.visit(node.argument); | |
} | |
ArrayExpression(node) { | |
node.elements.forEach(this.visit, this); | |
} | |
AssignmentExpression(node) { | |
this.assignments.push(node); | |
this.visit(node.left); | |
this.rightHandNodes.push(node.right); | |
this.assignments.pop(); | |
} | |
CallExpression(node) { | |
// arguments are right hand nodes. | |
node.arguments.forEach(a => { | |
this.rightHandNodes.push(a); | |
}); | |
this.visit(node.callee); | |
} | |
} | |
export default PatternVisitor; | |
/* vim: set sw=4 ts=4 et tw=80 : */ |