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File Name : pattern-visitor.js

/*
  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.
*/

import { Syntax } from 'estraverse';
import esrecurse from 'esrecurse';

function getLast(xs) {
    return xs[xs.length - 1] || null;
}

export default class PatternVisitor extends esrecurse.Visitor {
    static isPattern(node) {
        var 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.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) {
        var i, iz, element;
        for (i = 0, iz = pattern.elements.length; i < iz; ++i) {
            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 and esprima 2.0 parse 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);
    }
}

/* vim: set sw=4 ts=4 et tw=80 : */

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Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2021-11-10 09:12:34	Buat Folder Buat File Info
..	dir	-	0755	2021-11-10 09:12:34
definition.js	text/x-c++	2.78 KB	0644	2015-03-08 03:09:55	edit rename chmod hapus
index.js	text/html	5.73 KB	0644	2016-03-10 10:49:28	edit rename chmod hapus
pattern-visitor.js	text/plain	4.61 KB	0644	2016-03-10 10:49:28	edit rename chmod hapus
reference.js	text/plain	4.57 KB	0644	2016-03-10 10:49:28	edit rename chmod hapus
referencer.js	text/x-c++	18.61 KB	0644	2016-03-10 10:49:28	edit rename chmod hapus
scope-manager.js	text/plain	7.02 KB	0644	2016-03-10 10:49:28	edit rename chmod hapus
scope.js	text/plain	19.29 KB	0644	2016-03-10 10:49:28	edit rename chmod hapus
variable.js	text/plain	3.06 KB	0644	2015-01-31 09:13:40	edit rename chmod hapus