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How to use generateTrackerVar method in istanbul

Best JavaScript code snippet using istanbul

instrumenter.js

Source:instrumenter.js

...32                if (!preconditions[cond]) { throw new Error(cond); }33            }34        }35    }36    function generateTrackerVar(filename, omitSuffix) {37        var hash, suffix;38        if (crypto !== null) {39            hash = crypto.createHash('md5');40            hash.update(filename);41            suffix = hash.digest('base64');42            //trim trailing equal signs, turn identifier unsafe chars to safe ones + => _ and / => $43            suffix = suffix.replace(new RegExp('=', 'g'), '')44                .replace(new RegExp('\\+', 'g'), '_')45                .replace(new RegExp('/', 'g'), '$');46        } else {47            window.__cov_seq = window.__cov_seq || 0;48            window.__cov_seq += 1;49            suffix = window.__cov_seq;50        }51        return '__cov_' + (omitSuffix ? '' : suffix);52    }53    function pushAll(ary, thing) {54        if (!isArray(thing)) {55            thing = [ thing ];56        }57        Array.prototype.push.apply(ary, thing);58    }59    SYNTAX = {60        ArrayExpression: [ 'elements' ],61        AssignmentExpression: ['left', 'right'],62        BinaryExpression: ['left', 'right' ],63        BlockStatement: [ 'body' ],64        BreakStatement: [ 'label' ],65        CallExpression: [ 'callee', 'arguments'],66        CatchClause: ['param', 'body'],67        ConditionalExpression: [ 'test', 'consequent', 'alternate' ],68        ContinueStatement: [ 'label' ],69        DebuggerStatement: [ ],70        DoWhileStatement: [ 'test', 'body' ],71        EmptyStatement: [],72        ExpressionStatement: [ 'expression'],73        ForInStatement: [ 'left', 'right', 'body' ],74        ForStatement: ['init', 'test', 'update', 'body' ],75        FunctionDeclaration: ['id', 'params', 'body'],76        FunctionExpression: ['id', 'params', 'defaults', 'body'],77        Identifier: [],78        IfStatement: ['test', 'consequent', 'alternate'],79        LabeledStatement: ['label', 'body'],80        Literal: [],81        LogicalExpression: [ 'left', 'right' ],82        MemberExpression: ['object', 'property'],83        NewExpression: ['callee', 'arguments'],84        ObjectExpression: [ 'properties' ],85        Program: [ 'body' ],86        Property: [ 'key', 'value'],87        ReturnStatement: ['argument'],88        SequenceExpression: ['expressions'],89        SwitchCase: [ 'test', 'consequent' ],90        SwitchStatement: ['discriminant', 'cases' ],91        ThisExpression: [],92        ThrowStatement: ['argument'],93        TryStatement: [ 'block', 'handlers', 'finalizer' ],94        UnaryExpression: ['argument'],95        UpdateExpression: [ 'argument' ],96        VariableDeclaration: [ 'declarations' ],97        VariableDeclarator: [ 'id', 'init' ],98        WhileStatement: [ 'test', 'body' ],99        WithStatement: [ 'object', 'body' ]100    };101    for (nodeType in SYNTAX) {102        if (SYNTAX.hasOwnProperty(nodeType)) {103            SYNTAX[nodeType] = { name: nodeType, children: SYNTAX[nodeType] };104        }105    }106    astgen = {107        variable: function (name) { return { type: SYNTAX.Identifier.name, name: name }; },108        stringLiteral: function (str) { return { type: SYNTAX.Literal.name, value: String(str) }; },109        numericLiteral: function (num) { return { type: SYNTAX.Literal.name, value: Number(num) }; },110        statement: function (contents) { return { type: SYNTAX.ExpressionStatement.name, expression: contents }; },111        dot: function (obj, field) { return { type: SYNTAX.MemberExpression.name, computed: false, object: obj, property: field }; },112        subscript: function (obj, sub) { return { type: SYNTAX.MemberExpression.name, computed: true, object: obj, property: sub }; },113        postIncrement: function (obj) { return { type: SYNTAX.UpdateExpression.name, operator: '++', prefix: false, argument: obj }; },114        sequence: function (one, two) { return { type: SYNTAX.SequenceExpression.name, expressions: [one, two] }; }115    };116    function Walker(walkMap, scope, debug) {117        this.walkMap = walkMap;118        this.scope = scope;119        this.debug = debug;120        if (this.debug) {121            this.level = 0;122            this.seq = true;123        }124    }125    function defaultWalker(node, walker) {126        var type = node.type,127            children = SYNTAX[type].children,128            // don't run generated nodes thru custom walks otherwise we will attempt to instrument the instrumentation code :)129            applyCustomWalker = !!node.loc || node.type === SYNTAX.Program.name,130            walkerFn = applyCustomWalker ? walker.walkMap[type] : null,131            i,132            j,133            walkFnIndex,134            childType,135            childNode,136            ret = node,137            childArray,138            childElement,139            pathElement,140            assignNode,141            isLast;142        if (node.walking) { throw new Error('Infinite regress: Custom walkers may NOT call walker.walk(node)'); }143        node.walking = true;144        if (isArray(walkerFn)) {145            for (walkFnIndex = 0; walkFnIndex < walkerFn.length; walkFnIndex += 1) {146                isLast = walkFnIndex === walkerFn.length - 1;147                ret = walker.walk(ret, walkerFn[walkFnIndex]) || ret;148                if (ret.type !== type && !isLast) {149                    throw new Error('Only the last walker is allowed to change the node type: [type was: ' + type + ' ]');150                }151            }152        } else {153            if (walkerFn) {154                ret = walker.walk(node, walkerFn) || ret;155            }156        }157        for (i = 0; i < children.length; i += 1) {158            childType = children[i];159            childNode = node[childType];160            if (childNode && !childNode.skipWalk) {161                pathElement = { node: node, property: childType };162                if (isArray(childNode)) {163                    childArray = [];164                    for (j = 0; j < childNode.length; j += 1) {165                        childElement = childNode[j];166                        pathElement.index = j;167                        if (childElement) {168                          assignNode = walker.walk(childElement, null, pathElement) || childElement;169                          if (isArray(assignNode.prepend)) {170                              pushAll(childArray, assignNode.prepend);171                              delete assignNode.prepend;172                          }173                        }174                        pushAll(childArray, assignNode);175                    }176                    node[childType] = childArray;177                } else {178                    assignNode = walker.walk(childNode, null, pathElement) || childNode;179                    if (isArray(assignNode.prepend)) {180                        throw new Error('Internal error: attempt to prepend statements in disallowed (non-array) context');181                        /* if this should be allowed, this is how to solve it182                        tmpNode = { type: 'BlockStatement', body: [] };183                        pushAll(tmpNode.body, assignNode.prepend);184                        pushAll(tmpNode.body, assignNode);185                        node[childType] = tmpNode;186                        delete assignNode.prepend;187                        */188                    } else {189                        node[childType] = assignNode;190                    }191                }192            }193        }194        delete node.walking;195        return ret;196    }197    Walker.prototype = {198        startWalk: function (node) {199            this.path = [];200            this.walk(node);201        },202        walk: function (node, walkFn, pathElement) {203            var ret, i, seq, prefix;204            walkFn = walkFn || defaultWalker;205            if (this.debug) {206                this.seq += 1;207                this.level += 1;208                seq = this.seq;209                prefix = '';210                for (i = 0; i < this.level; i += 1) { prefix += '    '; }211                console.log(prefix + 'Enter (' + seq + '):' + node.type);212            }213            if (pathElement) { this.path.push(pathElement); }214            ret = walkFn.call(this.scope, node, this);215            if (pathElement) { this.path.pop(); }216            if (this.debug) {217                this.level -= 1;218                console.log(prefix + 'Return (' + seq + '):' + node.type);219            }220            return ret;221        },222        startLineForNode: function (node) {223            return node && node.loc && node.loc.start ? node.loc.start.line : null;224        },225        ancestor: function (n) {226            return this.path.length > n - 1 ? this.path[this.path.length - n] : null;227        },228        parent: function () {229            return this.ancestor(1);230        },231        isLabeled: function () {232            var el = this.parent();233            return el && el.node.type === SYNTAX.LabeledStatement.name;234        }235    };236    /**237     * mechanism to instrument code for coverage. It uses the `esprima` and238     * `escodegen` libraries for JS parsing and code generation respectively.239     *240     * Works on `node` as well as the browser.241     *242     * Usage on nodejs243     * ---------------244     *245     *      var instrumenter = new require('istanbul').Instrumenter(),246     *          changed = instrumenter.instrumentSync('function meaningOfLife() { return 42; }', 'filename.js');247     *248     * Usage in a browser249     * ------------------250     *251     * Load `esprima.js`, `escodegen.js` and `instrumenter.js` (this file) using `script` tags or other means.252     *253     * Create an instrumenter object as:254     *255     *      var instrumenter = new Instrumenter(),256     *          changed = instrumenter.instrumentSync('function meaningOfLife() { return 42; }', 'filename.js');257     *258     * Aside from demonstration purposes, it is unclear why you would want to instrument code in a browser.259     *260     * @class Instrumenter261     * @constructor262     * @param {Object} options Optional. Configuration options.263     * @param {String} [options.coverageVariable] the global variable name to use for264     *      tracking coverage. Defaults to `__coverage__`265     * @param {Boolean} [options.embedSource] whether to embed the source code of every266     *      file as an array in the file coverage object for that file. Defaults to `false`267     * @param {Boolean} [options.noCompact] emit readable code when set. Defaults to `false`268     * @param {Boolean} [options.noAutoWrap] do not automatically wrap the source in269     *      an anonymous function before covering it. By default, code is wrapped in270     *      an anonymous function before it is parsed. This is done because271     *      some nodejs libraries have `return` statements outside of272     *      a function which is technically invalid Javascript and causes the parser to fail.273     *      This construct, however, works correctly in node since module loading274     *      is done in the context of an anonymous function.275     *276     * Note that the semantics of the code *returned* by the instrumenter does not change in any way.277     * The function wrapper is "unwrapped" before the instrumented code is generated.278     * @param {Object} [options.codeGenerationOptions] an object that is directly passed to the `escodegen`279     *      library as configuration for code generation. The `noCompact` setting is not honored when this280     *      option is specified281     * @param {Boolean} [options.debug] assist in debugging. Currently, the only effect of282     *      setting this option is a pretty-print of the coverage variable. Defaults to `false`283     * @param {Boolean} [options.walkDebug] assist in debugging of the AST walker used by this class.284     *285     */286    function Instrumenter(options) {287        this.opts = options || {288            debug: false,289            walkDebug: false,290            coverageVariable: '__coverage__',291            codeGenerationOptions: undefined,292            noAutoWrap: false,293            noCompact: false,294            embedSource: false295        };296        this.walker = new Walker({297            ExpressionStatement: this.coverStatement,298            BreakStatement: this.coverStatement,299            ContinueStatement: this.coverStatement,300            DebuggerStatement: this.coverStatement,301            ReturnStatement: this.coverStatement,302            ThrowStatement: this.coverStatement,303            TryStatement: this.coverStatement,304            VariableDeclaration: this.coverStatement,305            IfStatement: [ this.ifBlockConverter, this.ifBranchInjector, this.coverStatement ],306            ForStatement: [ this.skipInit, this.loopBlockConverter, this.coverStatement ],307            ForInStatement: [ this.skipLeft, this.loopBlockConverter, this.coverStatement ],308            WhileStatement: [ this.loopBlockConverter, this.coverStatement ],309            DoWhileStatement: [ this.loopBlockConverter, this.coverStatement ],310            SwitchStatement: [ this.switchBranchInjector, this.coverStatement ],311            WithStatement: this.coverStatement,312            FunctionDeclaration: [ this.coverFunction, this.coverStatement ],313            FunctionExpression: this.coverFunction,314            LabeledStatement: this.coverStatement,315            ConditionalExpression: this.conditionalBranchInjector,316            LogicalExpression: this.logicalExpressionBranchInjector317        }, this, this.opts.walkDebug);318        //unit testing purposes only319        if (this.opts.backdoor && this.opts.backdoor.omitTrackerSuffix) {320            this.omitTrackerSuffix = true;321        }322    }323    Instrumenter.prototype = {324        /**325         * synchronous instrumentation method. Throws when illegal code is passed to it326         * @method instrumentSync327         * @param {String} code the code to be instrumented as a String328         * @param {String} filename Optional. The name of the file from which329         *  the code was read. A temporary filename is generated when not specified.330         *  Not specifying a filename is only useful for unit tests and demonstrations331         *  of this library.332         */333        instrumentSync: function (code, filename) {334            var program;335            //protect from users accidentally passing in a Buffer object instead336            if (typeof code !== 'string') { throw new Error('Code must be string'); }337            if (code.charAt(0) === '#') { //shebang, 'comment' it out, won't affect syntax tree locations for things we care about338                code = '//' + code;339            }340            if (!this.opts.noAutoWrap) {341                code = LEADER_WRAP + code + TRAILER_WRAP;342            }343            program = ESP.parse(code, { loc: true });344            if (!this.opts.noAutoWrap) {345                program = { type: SYNTAX.Program.name, body: program.body[0].expression.callee.body.body };346            }347            return this.instrumentASTSync(program, filename);348        },349        /**350         * synchronous instrumentation method that instruments an AST instead.351         * @method instrumentASTSync352         * @param {String} program the AST to be instrumented353         * @param {String} filename Optional. The name of the file from which354         *  the code was read. A temporary filename is generated when not specified.355         *  Not specifying a filename is only useful for unit tests and demonstrations356         *  of this library.357         */358        instrumentASTSync: function (program, filename) {359            filename = filename || String(new Date().getTime()) + '.js';360            this.coverState = {361                path: filename,362                s: {},363                b: {},364                f: {},365                fnMap: {},366                statementMap: {},367                branchMap: {}368            };369            this.currentState = {370                trackerVar: generateTrackerVar(filename, this.omitTrackerSuffix),371                func: 0,372                branch: 0,373                variable: 0,374                statement: 0375            };376            this.walker.startWalk(program);377            var codegenOptions = this.opts.codeGenerationOptions || { format: { compact: !this.opts.noCompact }};378            //console.log(JSON.stringify(program, undefined, 2));379            return this.getPreamble("") + '\n' + ESPGEN.generate(program, codegenOptions) + '\n';380        },381        /**382         * Callback based instrumentation. Note that this still executes synchronously in the same process tick383         * and calls back immediately. It only provides the options for callback style error handling as384         * opposed to a `try-catch` style and nothing more. Implemented as a wrapper over `instrumentSync`...

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3var code = 'var foo = "bar";';4instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {5  console.log(instrumentedCode);6});7var istanbul = require('istanbul');8var instrumenter = new istanbul.Instrumenter();9var code = 'var foo = "bar";';10instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {11  console.log(instrumentedCode);12});13var istanbul = require('istanbul');14var instrumenter = new istanbul.Instrumenter();15var code = 'var foo = "bar";';16instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {17  console.log(instrumentedCode);18});19var istanbul = require('istanbul');20var instrumenter = new istanbul.Instrumenter();21var code = 'var foo = "bar";';22instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {23  console.log(instrumentedCode);24});25var istanbul = require('istanbul');26var instrumenter = new istanbul.Instrumenter();27var code = 'var foo = "bar";';28instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {29  console.log(instrumentedCode);30});31var istanbul = require('istanbul');32var instrumenter = new istanbul.Instrumenter();33var code = 'var foo = "bar";';34instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {35  console.log(instrumentedCode);36});37var istanbul = require('istanbul');38var instrumenter = new istanbul.Instrumenter();39var code = 'var foo = "bar";';40instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {41  console.log(instrumentedCode);42});43var istanbul = require('istanbul');44var instrumenter = new istanbul.Instrumenter();45var code = 'var foo = "bar";';46instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {47  console.log(instrumentedCode);48});49var istanbul = require('

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3instrumenter.instrument('var a = 1;', 'test.js', function (err, code) {4    console.log(code);5});6var a = 1;7typeof __coverObject !== 'undefined' && __coverObject('test.js', {"path":"test.js","statementMap":{"0":{"start":{"line":1,"column":0},"end":{"line":1,"column":4}}},"fnMap":{},"branchMap":{},"s":{"0":1},"f":{},"b":{}});

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3var code = "var x = 10;";4instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {5    console.log(instrumentedCode);6});7var x = 10;

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3var code = 'var a = 1;';4var trackerVar = instrumenter.generateTrackerVar();5console.log(trackerVar);6__$$cov_20160202134702$$ = __$$cov_20160202134702$$ || [];7__$$cov_20160202134702$$.lineData = __$$cov_20160202134702$$.lineData || [];8__$$cov_20160202134702$$.lineData[0] = __$$cov_20160202134702$$.lineData[0] || [];9__$$cov_20160202134702$$.lineData[0][0] = __$$cov_20160202134702$$.lineData[0][0] || 0;10__$$cov_20160202134702$$.lineData[0][0]++;11__$$cov_20160202134702$$.lineData[0][1] = __$$cov_20160202134702$$.lineData[0][1] || 0;

Using AI Code Generation

1var istanbulMiddleware = require('istanbul-middleware');2var middleware = istanbulMiddleware.createHandler();3var trackerVar = middleware.generateTrackerVar();4var istanbulMiddleware = require('istanbul-middleware');5var middleware = istanbulMiddleware.createHandler();6var trackerVar = middleware.generateTrackerVar();7var trackerVar = middleware.generateTrackerVar();8var istanbulMiddleware = require('istanbul-middleware');9var middleware = istanbulMiddleware.createHandler();10var trackerVar = middleware.generateTrackerVar();11var istanbulMiddleware = require('istanbul-middleware');12var middleware = istanbulMiddleware.createHandler();13var trackerVar = middleware.generateTrackerVar();14var istanbulMiddleware = require('istanbul-middleware');15var middleware = istanbulMiddleware.createHandler();16var trackerVar = middleware.generateTrackerVar();17var istanbulMiddleware = require('istanbul-middleware');18var middleware = istanbulMiddleware.createHandler();19var trackerVar = middleware.generateTrackerVar();20var istanbulMiddleware = require('istanbul-middleware');21var middleware = istanbulMiddleware.createHandler();22var trackerVar = middleware.generateTrackerVar();23var istanbulMiddleware = require('istanbul-middleware');24var middleware = istanbulMiddleware.createHandler();25var trackerVar = middleware.generateTrackerVar();26var istanbulMiddleware = require('istanbul-middleware');27var middleware = istanbulMiddleware.createHandler();28var trackerVar = middleware.generateTrackerVar();29var istanbulMiddleware = require('istanbul-middleware');30var middleware = istanbulMiddleware.createHandler();31var trackerVar = middleware.generateTrackerVar();32var istanbulMiddleware = require('istanbul-middleware');

Using AI Code Generation

1var istanbulMiddleware = require('istanbul-middleware');2var generateTrackerVar = istanbulMiddleware.generateTrackerVar;3var trackerVar = generateTrackerVar();4console.log(trackerVar);5var istanbulMiddleware = require('istanbul-middleware');6var generateTrackerVar = istanbulMiddleware.generateTrackerVar;7var trackerVar = generateTrackerVar();8console.log(trackerVar);9I am using istanbul-middleware to generate coverage reports. I am able to generate the reports but I am not able to get the coverage details (coverage percentage, number of lines covered, number of lines not covered etc.) in my console. I am not sure if I am using the correct method to get the coverage details. I am using the following code to generate the coverage details:10I am using istanbul-middleware to generate coverage reports. I am able to generate the reports but I am not able to get the coverage details (coverage percentage, number of lines covered, number of lines not covered etc.) in my console. I am not sure if I am using the correct method to get the coverage details. I am using the following code to generate the coverage details:11I am using istanbul-middleware to generate coverage reports. I am able to generate the reports but I am not able to get the coverage details (coverage percentage, number of lines covered, number of lines not covered etc.) in my console. I am not sure if I am using the correct method to get the coverage details. I am using the following code to generate the coverage details:

Using AI Code Generation

1var istanbul = require('istanbul');2var tracker = istanbul.Tracker.create('default');3var varName = tracker.generateVarName('test.js');4console.log(varName);5var istanbul = require('istanbul');6var tracker = istanbul.Tracker.create('default');7var varName = tracker.generateVarName('test2.js');8console.log(varName);9var istanbul = require('istanbul');10var tracker = istanbul.Tracker.create('default');11var varName = tracker.generateVarName('test3.js');12console.log(varName);13var istanbul = require('istanbul');14var tracker = istanbul.Tracker.create('default');15var varName = tracker.generateVarName('test4.js');16console.log(varName);17var istanbul = require('istanbul');18var tracker = istanbul.Tracker.create('default');19var varName = tracker.generateVarName('test5.js');20console.log(varName);21var istanbul = require('istanbul');22var tracker = istanbul.Tracker.create('default');23var varName = tracker.generateVarName('test6.js');24console.log(varName);25var istanbul = require('istanbul');26var tracker = istanbul.Tracker.create('default');27var varName = tracker.generateVarName('test7.js');28console.log(varName);

Using AI Code Generation

1var istanbul = require('istanbul');2var generateTrackerVar = istanbul.api.generateTrackerVar;3var trackerVar = generateTrackerVar();4console.log(trackerVar);5var istanbul = require('istanbul');6var generateTrackerVar = istanbul.api.generateTrackerVar;7var trackerVar = generateTrackerVar();8console.log(trackerVar);9var istanbul = require('istanbul');10var generateTrackerVar = istanbul.api.generateTrackerVar;11var trackerVar = generateTrackerVar();12console.log(trackerVar);13var istanbul = require('istanbul');14var generateTrackerVar = istanbul.api.generateTrackerVar;15var trackerVar = generateTrackerVar();16console.log(trackerVar);17var istanbul = require('istanbul');18var generateTrackerVar = istanbul.api.generateTrackerVar;19var trackerVar = generateTrackerVar();20console.log(trackerVar);21var istanbul = require('istanbul');22var generateTrackerVar = istanbul.api.generateTrackerVar;23var trackerVar = generateTrackerVar();24console.log(trackerVar);25var istanbul = require('istanbul');26var generateTrackerVar = istanbul.api.generateTrackerVar;27var trackerVar = generateTrackerVar();28console.log(trackerVar);

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