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166 lines
4.7 KiB
166 lines
4.7 KiB
/*
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Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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const READ = 0x1;
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const WRITE = 0x2;
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const RW = READ | WRITE;
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/**
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* A Reference represents a single occurrence of an identifier in code.
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* @constructor Reference
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*/
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class Reference {
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constructor(ident, scope, flag, writeExpr, maybeImplicitGlobal, partial, init) {
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/**
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* Identifier syntax node.
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* @member {espreeIdentifier} Reference#identifier
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*/
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this.identifier = ident;
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/**
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* Reference to the enclosing Scope.
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* @member {Scope} Reference#from
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*/
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this.from = scope;
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/**
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* Whether the reference comes from a dynamic scope (such as 'eval',
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* 'with', etc.), and may be trapped by dynamic scopes.
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* @member {boolean} Reference#tainted
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*/
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this.tainted = false;
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/**
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* The variable this reference is resolved with.
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* @member {Variable} Reference#resolved
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*/
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this.resolved = null;
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/**
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* The read-write mode of the reference. (Value is one of {@link
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* Reference.READ}, {@link Reference.RW}, {@link Reference.WRITE}).
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* @member {number} Reference#flag
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* @private
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*/
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this.flag = flag;
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if (this.isWrite()) {
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/**
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* If reference is writeable, this is the tree being written to it.
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* @member {espreeNode} Reference#writeExpr
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*/
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this.writeExpr = writeExpr;
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/**
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* Whether the Reference might refer to a partial value of writeExpr.
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* @member {boolean} Reference#partial
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*/
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this.partial = partial;
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/**
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* Whether the Reference is to write of initialization.
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* @member {boolean} Reference#init
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*/
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this.init = init;
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}
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this.__maybeImplicitGlobal = maybeImplicitGlobal;
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}
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/**
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* Whether the reference is static.
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* @function Reference#isStatic
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* @returns {boolean} static
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*/
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isStatic() {
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return !this.tainted && this.resolved && this.resolved.scope.isStatic();
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}
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/**
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* Whether the reference is writeable.
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* @function Reference#isWrite
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* @returns {boolean} write
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*/
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isWrite() {
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return !!(this.flag & Reference.WRITE);
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}
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/**
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* Whether the reference is readable.
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* @function Reference#isRead
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* @returns {boolean} read
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*/
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isRead() {
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return !!(this.flag & Reference.READ);
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}
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/**
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* Whether the reference is read-only.
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* @function Reference#isReadOnly
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* @returns {boolean} read only
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*/
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isReadOnly() {
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return this.flag === Reference.READ;
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}
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/**
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* Whether the reference is write-only.
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* @function Reference#isWriteOnly
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* @returns {boolean} write only
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*/
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isWriteOnly() {
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return this.flag === Reference.WRITE;
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}
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/**
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* Whether the reference is read-write.
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* @function Reference#isReadWrite
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* @returns {boolean} read write
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*/
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isReadWrite() {
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return this.flag === Reference.RW;
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}
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}
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/**
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* @constant Reference.READ
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* @private
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*/
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Reference.READ = READ;
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/**
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* @constant Reference.WRITE
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* @private
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*/
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Reference.WRITE = WRITE;
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/**
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* @constant Reference.RW
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* @private
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*/
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Reference.RW = RW;
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export default Reference;
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/* vim: set sw=4 ts=4 et tw=80 : */
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