1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
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   8  *   - Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  *
  11  *   - Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *
  15  *   - Neither the name of Oracle nor the names of its
  16  *     contributors may be used to endorse or promote products derived
  17  *     from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 
  32 
  33 // Simple demo of Nashorn Parser API
  34 
  35 var Parser = Java.type("jdk.nashorn.api.tree.Parser");
  36 var SimpleTreeVisitor = Java.type("jdk.nashorn.api.tree.SimpleTreeVisitorES5_1");
  37 var IdentifierTree = Java.type("jdk.nashorn.api.tree.IdentifierTree");
  38 
  39 var parser = Parser.create();
  40 var ast = parser.parse("t", "eval('hello');\n  eval(2 + 3)", print);
  41 // locate 'eval' calls in the script
  42 ast.accept(visitor = new (Java.extend(SimpleTreeVisitor)) {
  43     lineMap: null,
  44     visitCompilationUnit: function(node, extra) {
  45         this.lineMap = node.lineMap;
  46         Java.super(visitor).visitCompilationUnit(node, extra);
  47     },
  48 
  49     visitFunctionCall: function(node, extra) {
  50        var func = node.functionSelect;
  51        if (func instanceof IdentifierTree && func.name == "eval") {
  52            var pos = node.startPosition;
  53            var line = this.lineMap.getLineNumber(pos);
  54            var column = this.lineMap.getColumnNumber(pos);
  55            print("eval call found @ " + line + ":" + column);
  56        } 
  57     } 
  58 }, null);