| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * |
| * 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. |
| * |
| * - Neither the name of Oracle nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * 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 THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS 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. |
| */ |
| |
| /* |
| * Hjson - "the Human JSON - A configuration file format that |
| * caters to humans and helps reduce the errors they make" |
| * See also: http://hjson.org/ |
| * |
| * I wanted to see if we can use Nashorn Parser API (jdk9) to support |
| * similar flexible JSON extension with #nashorn. In this FlexiJSON.parse |
| * implementation, Nashorn Parser API is used to validate that the |
| * extendable flexi JSON is "data only" (i.e., no executable code) and |
| * then 'eval'ed to make an object out of it. |
| * |
| * FlexiJSON allows the following: |
| * |
| * * single and mutliple line comments anywhere |
| * * non-quoted property names and values |
| * * regexp literal values |
| * * omitting trailing comma |
| * |
| * When nashorn -scripting mode is enabled, FlexiJSON supports these |
| * as well: |
| * |
| * * shell style # comments |
| * * multiple line (Unix heredoc style) string values |
| */ |
| |
| "use strict"; |
| |
| function FlexiJSON() {} |
| |
| // helper to locate Nashorn Parser API classes |
| FlexiJSON.treeType = function(name) { |
| return Java.type("jdk.nashorn.api.tree." + name); |
| } |
| |
| // Nashorn Parser API classes used |
| FlexiJSON.ArrayLiteral = FlexiJSON.treeType("ArrayLiteralTree"); |
| FlexiJSON.ExpressionStatement = FlexiJSON.treeType("ExpressionStatementTree"); |
| FlexiJSON.ObjectLiteral = FlexiJSON.treeType("ObjectLiteralTree"); |
| FlexiJSON.RegExpLiteral = FlexiJSON.treeType("RegExpLiteralTree"); |
| FlexiJSON.Literal = FlexiJSON.treeType("LiteralTree"); |
| FlexiJSON.Parser = FlexiJSON.treeType("Parser"); |
| FlexiJSON.SimpleTreeVisitor = FlexiJSON.treeType("SimpleTreeVisitorES5_1"); |
| |
| // FlexiJSON.parse API |
| |
| FlexiJSON.parse = function(str) { |
| var parser = (typeof $OPTIONS == "undefined")? |
| FlexiJSON.Parser.create() : |
| FlexiJSON.Parser.create("-scripting"); |
| |
| // force the string to be an expression by putting it inside (, ) |
| str = "(" + str + ")"; |
| var ast = parser.parse("<flexijsondoc>", str, null); |
| // Should not happen. parse would have thrown syntax error |
| if (!ast) { |
| return undefined; |
| } |
| |
| // allowed 'literal' values in flexi JSON |
| function isLiteral(node) { |
| return node instanceof FlexiJSON.ArrayLiteral || |
| node instanceof FlexiJSON.Literal || |
| node instanceof FlexiJSON.ObjectLiteral || |
| node instanceof FlexiJSON.RegExpLiteral; |
| } |
| |
| var visitor; |
| ast.accept(visitor = new (Java.extend(FlexiJSON.SimpleTreeVisitor)) { |
| lineMap: null, |
| |
| throwError: function(msg, node) { |
| if (this.lineMap) { |
| var pos = node.startPosition; |
| var line = this.lineMap.getLineNumber(pos); |
| var column = this.lineMap.getColumnNumber(pos); |
| // we introduced extra '(' at start. So, adjust column number |
| msg = msg + " @ " + line + ":" + (column - 1); |
| } |
| throw new TypeError(msg); |
| }, |
| |
| visitLiteral: function(node, extra) { |
| print(node.value); |
| }, |
| |
| visitExpressionStatement: function(node, extra) { |
| var expr = node.expression; |
| if (isLiteral(expr)) { |
| expr.accept(visitor, extra); |
| } else { |
| this.throwError("only literals can occur", expr); |
| } |
| }, |
| |
| visitArrayLiteral: function(node, extra) { |
| for each (var elem in node.elements) { |
| if (isLiteral(elem)) { |
| elem.accept(visitor, extra); |
| } else { |
| this.throwError("only literal array element value allowed", elem); |
| } |
| } |
| }, |
| |
| visitObjectLiteral: function(node, extra) { |
| for each (var prop in node.properties) { |
| if (prop.getter != null || prop.setter != null) { |
| this.throwError("getter/setter property not allowed", node); |
| } |
| |
| var value = prop.value; |
| if (isLiteral(value)) { |
| value.accept(visitor, extra); |
| } else { |
| this.throwError("only literal property value allowed", value); |
| } |
| } |
| }, |
| |
| visitCompilationUnit: function(node, extra) { |
| this.lineMap = node.lineMap; |
| var elements = node.sourceElements; |
| if (elements.length > 1) { |
| this.throwError("more than one top level expression", node.sourceElements[1]); |
| } |
| var stat = node.sourceElements[0]; |
| if (! (stat instanceof FlexiJSON.ExpressionStatement)) { |
| this.throwError("only one top level expresion allowed", stat); |
| } |
| stat.accept(visitor, extra); |
| }, |
| }, null); |
| |
| // safe to eval given string as flexi JSON! |
| return eval(str); |
| } |