Initial commit

src/js/operations/JS.js

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+/* globals esprima, escodegen, esmangle */
+
+/**
+ * JavaScript operations.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ *
+ * @namespace
+ */
+var JS = {
+    
+    /**
+     * @constant
+     * @default
+     */
+    PARSE_LOC: false,
+    /**
+     * @constant
+     * @default
+     */
+    PARSE_RANGE: false,
+    /**
+     * @constant
+     * @default
+     */
+    PARSE_TOKENS: false,
+    /**
+     * @constant
+     * @default
+     */
+    PARSE_COMMENT: false,
+    /**
+     * @constant
+     * @default
+     */
+    PARSE_TOLERANT: false,
+    
+    /**
+     * JavaScript Parser operation.
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run_parse: function (input, args) {
+        var parse_loc = args[0],
+            parse_range = args[1],
+            parse_tokens = args[2],
+            parse_comment = args[3],
+            parse_tolerant = args[4],
+            result = {},
+            options = {
+                loc:      parse_loc,
+                range:    parse_range,
+                tokens:   parse_tokens,
+                comment:  parse_comment,
+                tolerant: parse_tolerant
+            };
+            
+        result = esprima.parse(input, options);
+        return JSON.stringify(result, null, 2);
+    },
+    
+    
+    /**
+     * @constant
+     * @default
+     */
+    BEAUTIFY_INDENT: "\\t",
+    /**
+     * @constant
+     * @default
+     */
+    BEAUTIFY_QUOTES: ["Auto", "Single", "Double"],
+    /**
+     * @constant
+     * @default
+     */
+    BEAUTIFY_SEMICOLONS: true,
+    /**
+     * @constant
+     * @default
+     */
+    BEAUTIFY_COMMENT: true,
+    
+    /**
+     * JavaScript Beautify operation.
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run_beautify: function(input, args) {
+        var beautify_indent = args[0] || JS.BEAUTIFY_INDENT,
+            quotes = args[1].toLowerCase(),
+            beautify_semicolons = args[2],
+            beautify_comment = args[3],
+            result = "",
+            AST;
+            
+        try {
+            AST = esprima.parse(input, {
+                range: true,
+                tokens: true,
+                comment: true
+            });
+            
+            var options = {
+                format: {
+                    indent: {
+                        style: beautify_indent
+                    },
+                    quotes: quotes,
+                    semicolons: beautify_semicolons,
+                },
+                comment: beautify_comment
+            };
+            
+            if (options.comment)
+                AST = escodegen.attachComments(AST, AST.comments, AST.tokens);
+                
+            result = escodegen.generate(AST, options);
+        } catch(e) {
+            // Leave original error so the user can see the detail
+            throw "Unable to parse JavaScript.<br>" + e.message;
+        }
+        return result;
+    },
+    
+    
+    /**
+     * JavaScript Minify operation.
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run_minify: function(input, args) {
+        var result = "",
+            AST = esprima.parse(input),
+            optimised_AST = esmangle.optimize(AST, null),
+            mangled_AST = esmangle.mangle(optimised_AST);
+            
+        result = escodegen.generate(mangled_AST, {
+            format: {
+                renumber:    true,
+                hexadecimal: true,
+                escapeless:  true,
+                compact:     true,
+                semicolons:  false,
+                parentheses: false
+            }
+        });
+        return result;
+    },
+
+};