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qwen/nodejs/node_modules/eslint-scope/lib/reference.js

@@ -0,0 +1,166 @@
+/*
+  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.
+*/
+
+const READ = 0x1;
+const WRITE = 0x2;
+const RW = READ | WRITE;
+
+/**
+ * A Reference represents a single occurrence of an identifier in code.
+ * @constructor Reference
+ */
+class Reference {
+    constructor(ident, scope, flag, writeExpr, maybeImplicitGlobal, partial, init) {
+
+        /**
+         * Identifier syntax node.
+         * @member {espreeIdentifier} Reference#identifier
+         */
+        this.identifier = ident;
+
+        /**
+         * Reference to the enclosing Scope.
+         * @member {Scope} Reference#from
+         */
+        this.from = scope;
+
+        /**
+         * Whether the reference comes from a dynamic scope (such as 'eval',
+         * 'with', etc.), and may be trapped by dynamic scopes.
+         * @member {boolean} Reference#tainted
+         */
+        this.tainted = false;
+
+        /**
+         * The variable this reference is resolved with.
+         * @member {Variable} Reference#resolved
+         */
+        this.resolved = null;
+
+        /**
+         * The read-write mode of the reference. (Value is one of {@link
+         * Reference.READ}, {@link Reference.RW}, {@link Reference.WRITE}).
+         * @member {number} Reference#flag
+         * @private
+         */
+        this.flag = flag;
+        if (this.isWrite()) {
+
+            /**
+             * If reference is writeable, this is the tree being written to it.
+             * @member {espreeNode} Reference#writeExpr
+             */
+            this.writeExpr = writeExpr;
+
+            /**
+             * Whether the Reference might refer to a partial value of writeExpr.
+             * @member {boolean} Reference#partial
+             */
+            this.partial = partial;
+
+            /**
+             * Whether the Reference is to write of initialization.
+             * @member {boolean} Reference#init
+             */
+            this.init = init;
+        }
+        this.__maybeImplicitGlobal = maybeImplicitGlobal;
+    }
+
+    /**
+     * Whether the reference is static.
+     * @function Reference#isStatic
+     * @returns {boolean} static
+     */
+    isStatic() {
+        return !this.tainted && this.resolved && this.resolved.scope.isStatic();
+    }
+
+    /**
+     * Whether the reference is writeable.
+     * @function Reference#isWrite
+     * @returns {boolean} write
+     */
+    isWrite() {
+        return !!(this.flag & Reference.WRITE);
+    }
+
+    /**
+     * Whether the reference is readable.
+     * @function Reference#isRead
+     * @returns {boolean} read
+     */
+    isRead() {
+        return !!(this.flag & Reference.READ);
+    }
+
+    /**
+     * Whether the reference is read-only.
+     * @function Reference#isReadOnly
+     * @returns {boolean} read only
+     */
+    isReadOnly() {
+        return this.flag === Reference.READ;
+    }
+
+    /**
+     * Whether the reference is write-only.
+     * @function Reference#isWriteOnly
+     * @returns {boolean} write only
+     */
+    isWriteOnly() {
+        return this.flag === Reference.WRITE;
+    }
+
+    /**
+     * Whether the reference is read-write.
+     * @function Reference#isReadWrite
+     * @returns {boolean} read write
+     */
+    isReadWrite() {
+        return this.flag === Reference.RW;
+    }
+}
+
+/**
+ * @constant Reference.READ
+ * @private
+ */
+Reference.READ = READ;
+
+/**
+ * @constant Reference.WRITE
+ * @private
+ */
+Reference.WRITE = WRITE;
+
+/**
+ * @constant Reference.RW
+ * @private
+ */
+Reference.RW = RW;
+
+export default Reference;
+
+/* vim: set sw=4 ts=4 et tw=80 : */