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babel-plugin-transform-adana

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.skip = skip; exports.key = key; exports.default = instrumenter; var types = _interopRequireWildcard(require("@babel/types")); var _micromatch = _interopRequireDefault(require("micromatch")); var _path = require("path"); var _prelude = _interopRequireDefault(require("./prelude")); var _meta = _interopRequireDefault(require("./meta")); var _tags = require("./tags"); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } } function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); } function skip(_ref, file) { var ignore = _ref.ignore, only = _ref.only; if (only) { return (0, _micromatch.default)([file], Array.isArray(only) ? only : [only], { nocase: true }).length <= 0; } if (ignore) { return (0, _micromatch.default)([file], Array.isArray(ignore) ? ignore : [ignore], { nocase: true }).length > 0; } return false; } /** * Create an opaque, unique key for a given node. Useful for tagging the node * in separate places. * @param {Object} path Babel path to derive key from. * @returns {String} String key. */ function key(path) { var node = path.node; if (node.loc) { var location = node.loc.start; return `${location.line}:${location.column}`; } throw new TypeError('Path must have valid location.'); } /** * Some nodes need to marked as non-instrumentable; since babel will apply * our plugin to nodes we create, we have to be careful to not put ourselves * into an infinite loop. * @param {Object} node Babel AST node. * @returns {Object} Babel AST node that won't be instrumented. */ function X(node) { node.__adana = true; return node; } function ignore(path) { return !path.node || !path.node.loc || path.node.__adana; } function standardize(listener) { return function (path, state) { return ignore(path) ? undefined : listener(path, state); }; } /** * Create the transform-adana babel plugin. * @returns {Object} `babel` plugin object. */ function instrumenter() { /** * Create a chunk of code that marks the specified node as having * been executed. * @param {Object} state `babel` state for the path that's being walked. * @param {Object} options Configure how the marker behaves. * @returns {Object} AST node for marking coverage. */ function createMarker(state, options) { var tags = options.tags, loc = options.loc, name = options.name, group = options.group; var coverage = (0, _meta.default)(state); var id = coverage.entries.length; coverage.entries.push({ id, loc, tags, name, group, count: 0 }); // Maker is simply a statement incrementing a coverage variable. return X(types.updateExpression('++', types.memberExpression(types.memberExpression(coverage.variable, types.numericLiteral(id), true), types.stringLiteral('count'), true), true)); } /** * [isInstrumentableStatement description] * @param {[type]} path [description] * @returns {Boolean} [description] */ function isInstrumentableStatement(path) { var parent = path.parentPath; return !parent.isReturnStatement() && !parent.isVariableDeclaration() && !parent.isExportDeclaration() && !parent.isFunctionDeclaration() && !parent.isIfStatement(); } /** * Inject a marker that measures whether the node for the given path has * been run or not. * @param {Object} path [description] * @param {Object} state [description] * @param {Object} options [description] * @returns {void} */ function instrument(path, state, options) { // This function is here because isInstrumentableStatement() is being // called; we can't create the marker without knowing the result of that, // otherwise dead markers will be created. function marker() { return createMarker(state, _extends({ loc: path.node.loc }, options)); } if (path.isBlockStatement()) { path.unshiftContainer('body', X(types.expressionStatement(marker()))); } else if (path.isExpression()) { path.replaceWith(X(types.sequenceExpression([marker(), path.node]))); } else if (path.isStatement()) { if (isInstrumentableStatement(path)) { path.insertBefore(X(types.expressionStatement(marker()))); } } } /** * [visitStatement description] * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitStatement(path, state) { instrument(path, state, { tags: ['statement', 'line'], loc: path.node.loc }); } /** * The function visitor is mainly to track the definitions of functions; * being able ensure how many of your functions have actually been invoked. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitFunction(path, state) { instrument(path.get('body'), state, { tags: ['function'], name: path.node.id ? path.node.id.name : `@${key(path)}`, loc: path.node.loc }); } /** * Multiple branches based on the result of `case _` and `default`. If you * do not provide a `default` one will be intelligently added for you, * forcing you to cover that case. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitSwitchStatement(path, state) { var hasDefault = false; path.get('cases').forEach(function (entry) { if (entry.node.test) { (0, _tags.addRules)(state, entry.node.loc, entry.node.test.trailingComments); } if (entry.node.consequent.length > 1) { (0, _tags.addRules)(state, entry.node.loc, entry.node.consequent[0].leadingComments); } if (entry.node.test === null) { hasDefault = true; } entry.unshiftContainer('consequent', createMarker(state, { tags: ['branch', 'switch'], loc: entry.node.loc, group: key(path) })); }); // Default is technically a branch, just like if statements without // else's are also technically a branch. if (!hasDefault) { // Add an extra break to the end of the last case in case some idiot // forgot to add it. var cases = path.get('cases'); if (cases.length > 0) { cases[cases.length - 1].pushContainer('consequent', types.breakStatement()); } // Finally add the default case. path.pushContainer('cases', types.switchCase(null, [types.expressionStatement(createMarker(state, { tags: ['branch', 'switch'], loc: { start: path.node.loc.end, end: path.node.loc.end }, group: key(path) })), types.breakStatement()])); } } /** * [visitVariableDeclaration description] * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitVariableDeclaration(path, state) { path.get('declarations').forEach(function (decl) { if (decl.has('init')) { instrument(decl.get('init'), state, { tags: ['statement', 'variable', 'line'] }); } }); } /** * Includes both while and do-while loops. They contain a single branch which * tests the loop condition. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitWhileLoop(path, state) { var test = path.get('test'); var group = key(path); // This is a particularly clever use of the fact JS operators are short- // circuiting. To instrument a loop one _cannot_ add a marker on the outside // of the loop body due to weird cases of things where loops are in non- // block if statements. So instead, create the following mechanism: // ((condition && A) || !B) where A and B are markers. Since markers are // postfix, they're always true. Ergo, A is only incremented when condition // is true, B only when it's false and the truth value of the whole // statement is preserved. Neato. test.replaceWith(types.logicalExpression('||', types.logicalExpression('&&', X(test.node), createMarker(state, { tags: ['branch', 'line', 'statement', 'loop', 'while'], loc: test.node.loc, group })), types.unaryExpression('!', createMarker(state, { tags: ['branch', 'line', 'loop', 'while'], loc: test.node.loc, group })))); } /** * The try block can either fully succeed (no error) or it can throw. Both * cases are accounted for. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitTryStatement(path, state) { var group = key(path); var body = path.get('block'); var trigger = path.scope.generateDeclaredUidIdentifier('_exception'); (0, _tags.addRules)(state, body.node.loc, body.node.leadingComments); path.get('block').unshiftContainer('body', types.expressionStatement(types.assignmentExpression('=', trigger, types.booleanLiteral(true)))); var handlerExpression = types.expressionStatement(types.assignmentExpression('=', trigger, types.booleanLiteral(false))); var handlerLoc; if (path.has('handler')) { var handler = path.get('handler').node; handlerLoc = handler.loc; (0, _tags.addRules)(state, handler.loc, handler.body.leadingComments); path.get('handler.body').unshiftContainer('body', handlerExpression); } else { var loc = path.get('block').node.loc.end; handlerLoc = { start: loc, end: loc }; path.get('handler').replaceWith(types.catchClause(types.identifier('err'), types.blockStatement([handlerExpression, types.throwStatement(types.identifier('err'))]))); } var guard = types.ifStatement(trigger, types.expressionStatement(createMarker(state, { tags: ['branch', 'line', 'exception'], loc: path.get('block').node.loc, group })), types.expressionStatement(createMarker(state, { tags: ['branch', 'line', 'exception'], loc: handlerLoc, group }))); if (path.has('finalizer')) { path.get('finalizer').unshiftContainer('body', guard); } else { path.get('finalizer').replaceWith(types.blockStatement([guard])); } } /** * Return statements are instrumented by marking the next block they return. * This helps ensure multi-line expressions for return statements are * accurately captured. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {[type]} [description] */ function visitReturnStatement(path, state) { if (!path.has('argument')) { path.get('argument').replaceWith(types.sequenceExpression([createMarker(state, { loc: path.node.loc, tags: ['line', 'statement'] }), types.identifier('undefined')])); } else { instrument(path.get('argument'), state, { tags: ['line', 'statement'] }); } } /** * For multi-line reporting (and objects do tend to span multiple lines) this * is required to know which parts of the object where actually executed. * Ignore shorthand property that look like `{ this }`. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {[type]} [description] */ function visitObjectProperty(path, state) { if (!path.node.shorthand && !path.parentPath.isPattern()) { var _key = path.get('key'); var value = path.get('value'); if (path.node.computed) { instrument(_key, state, { tags: ['line'] }); } instrument(value, state, { tags: ['line'] }); } } /** * For multi-line reporting (and arrays do tend to span multiple lines) this * is required to know which parts of the array where actually executed. * This does _not_ include destructed arrays. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {[type]} [description] */ function visitArrayExpression(path, state) { if (!path.parentPath.isPattern()) { path.get('elements').forEach(function (element) { instrument(element, state, { tags: ['line'] }); }); } } /** * Logical expressions are those using logic operators like `&&` and `||`. * Since logic expressions short-circuit in JS they are effectively branches * and will be treated as such here. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitLogicalExpression(path, state) { var group = key(path); var left = path.get('left').node; var right = path.get('right').node; path.replaceWith(X(types.logicalExpression(path.node.operator, types.sequenceExpression([createMarker(state, { tags: ['branch', 'logic'], loc: left.loc, group }), left]), types.sequenceExpression([createMarker(state, { tags: ['branch', 'logic'], loc: right.loc, group }), right])))); } /** * Conditionals are either if/else statements or tenaiary expressions. They * have a test case and two choices (based on the test result). Both cases * are always accounted for, even if the code does not exist for the alternate * case. * @param {[type]} path [description] * @param {[type]} state [description] * @returns {void} */ function visitConditional(path, state) { // Branches can be grouped together so that each of the possible branch // destinations is accounted for under one group. For if statements, this // refers to all the blocks that fall under a single if.. else if.. else.. // grouping. var root = path.findParent(function (search) { return search.node.type === path.node.type && !ignore(search) && (!search.parentPath || search.parentPath.node.type !== path.node.type); }) || path; // Create the group name based on the root `if` statement. var group = key(root); function tagBranch(path) { (0, _tags.addRules)(state, path.node.loc, path.node.leadingComments); if (path.isBlockStatement() && path.node.body.length > 0) { (0, _tags.addRules)(state, path.node.loc, path.node.body[0].leadingComments); } } tagBranch(path.get('consequent')); if (path.has('alternate')) { tagBranch(path.get('alternate')); } instrument(path.get('consequent'), state, { tags: ['branch', 'line', 'if'], loc: path.node.consequent.loc, group }); if (path.has('alternate') && !path.get('alternate').isIfStatement()) { instrument(path.get('alternate'), state, { tags: ['branch', 'line', 'if'], loc: path.node.alternate.loc, group }); } else if (!path.has('alternate')) { path.get('alternate').replaceWith(types.expressionStatement(createMarker(state, { tags: ['branch', 'if'], loc: { start: path.node.loc.end, end: path.node.loc.end }, group }))); } } function noInstrument(path) { if (path.node && path.node.leadingComments && path.node.leadingComments.some(function (comment) { return /^\s*adana-no-instrument\s*$/.exec(comment.value); })) { path.skip(); return; } } var visitor = { // Expressions ArrowFunctionExpression: visitFunction, FunctionExpression: visitFunction, ObjectMethod: visitFunction, ClassMethod: visitFunction, LogicalExpression: visitLogicalExpression, ConditionalExpression: visitConditional, ObjectProperty: visitObjectProperty, ArrayExpression: visitArrayExpression, // Declarations FunctionDeclaration: visitFunction, VariableDeclaration: visitVariableDeclaration, // Statements ContinueStatement: visitStatement, BreakStatement: visitStatement, ExpressionStatement: visitStatement, ThrowStatement: visitStatement, ReturnStatement: visitReturnStatement, TryStatement: visitTryStatement, WhileStatement: visitWhileLoop, DoWhileStatement: visitWhileLoop, IfStatement: visitConditional, SwitchStatement: visitSwitchStatement, // Generics enter: noInstrument }; Object.keys(visitor).forEach(function (key) { visitor[key] = standardize(visitor[key]); }); // Create the actual babel plugin object. return { visitor: { Program(path, state) { var opts = state.opts, filename = state.filename, cwd = state.file.opts.cwd; // Check if file should be instrumented or not. var name = filename ? (0, _path.relative)(cwd, filename) : '<source>'; if (filename && skip(opts, name)) { return; } (0, _meta.default)(state, { source: state.file.code, entries: [], rules: [], tags: {}, variable: path.scope.generateUidIdentifier('coverage'), name }); path.traverse(visitor, state); (0, _tags.applyRules)(state); path.unshiftContainer('body', (0, _prelude.default)(state)); } } }; } //# 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* as types from '@babel/types';\nimport micromatch from 'micromatch';\nimport {relative} from 'path';\n\nimport prelude from './prelude';\nimport meta from './meta';\nimport {applyRules, addRules} from './tags';\n\nexport function skip({ignore, only}, file) {\n  if (only) {\n    return micromatch(\n      [file],\n      Array.isArray(only) ? only : [only],\n      {nocase: true}\n    ).length <= 0;\n  }\n  if (ignore) {\n    return micromatch(\n      [file],\n      Array.isArray(ignore) ? ignore : [ignore],\n      {nocase: true}\n    ).length > 0;\n  }\n  return false;\n}\n\n/**\n * Create an opaque, unique key for a given node. Useful for tagging the node\n * in separate places.\n * @param {Object} path Babel path to derive key from.\n * @returns {String} String key.\n */\nexport function key(path) {\n  const node = path.node;\n  if (node.loc) {\n    const location = node.loc.start;\n    return `${location.line}:${location.column}`;\n  }\n  throw new TypeError('Path must have valid location.');\n}\n\n/**\n * Some nodes need to marked as non-instrumentable; since babel will apply\n * our plugin to nodes we create, we have to be careful to not put ourselves\n * into an infinite loop.\n * @param {Object} node Babel AST node.\n * @returns {Object} Babel AST node that won't be instrumented.\n */\nfunction X(node) {\n  node.__adana = true;\n  return node;\n}\n\nfunction ignore(path) {\n  return (!path.node || !path.node.loc || path.node.__adana);\n}\n\nfunction standardize(listener) {\n  return (path, state) => ignore(path) ? undefined : listener(path, state);\n}\n\n/**\n * Create the transform-adana babel plugin.\n * @returns {Object} `babel` plugin object.\n */\nexport default function instrumenter() {\n  /**\n   * Create a chunk of code that marks the specified node as having\n   * been executed.\n   * @param {Object} state `babel` state for the path that's being walked.\n   * @param {Object} options Configure how the marker behaves.\n   * @returns {Object} AST node for marking coverage.\n   */\n  function createMarker(state, options) {\n    const {tags, loc, name, group} = options;\n    const coverage = meta(state);\n    const id = coverage.entries.length;\n\n    coverage.entries.push({\n      id,\n      loc,\n      tags,\n      name,\n      group,\n      count: 0,\n    });\n\n    // Maker is simply a statement incrementing a coverage variable.\n    return X(types.updateExpression('++', types.memberExpression(\n      types.memberExpression(\n        coverage.variable,\n        types.numericLiteral(id),\n        true\n      ),\n      types.stringLiteral('count'),\n      true\n    ), true));\n  }\n\n  /**\n   * [isInstrumentableStatement description]\n   * @param   {[type]}  path [description]\n   * @returns {Boolean}      [description]\n   */\n  function isInstrumentableStatement(path) {\n    const parent = path.parentPath;\n    return !parent.isReturnStatement() &&\n      !parent.isVariableDeclaration() &&\n      !parent.isExportDeclaration() &&\n      !parent.isFunctionDeclaration() &&\n      !parent.isIfStatement();\n  }\n\n  /**\n   * Inject a marker that measures whether the node for the given path has\n   * been run or not.\n   * @param {Object} path    [description]\n   * @param {Object} state   [description]\n   * @param {Object} options [description]\n   * @returns {void}\n   */\n  function instrument(path, state, options) {\n    // This function is here because isInstrumentableStatement() is being\n    // called; we can't create the marker without knowing the result of that,\n    // otherwise dead markers will be created.\n    function marker() {\n      return createMarker(state, {\n        loc: path.node.loc,\n        ...options,\n      });\n    }\n\n    if (path.isBlockStatement()) {\n      path.unshiftContainer('body', X(types.expressionStatement(marker())));\n    } else if (path.isExpression()) {\n      path.replaceWith(X(types.sequenceExpression([marker(), path.node])));\n    } else if (path.isStatement()) {\n      if (isInstrumentableStatement(path)) {\n        path.insertBefore(X(types.expressionStatement(marker())));\n      }\n    }\n  }\n\n  /**\n   * [visitStatement description]\n   * @param {[type]} path  [description]\n   * @param {[type]} state [description]\n   * @returns {void}\n   */\n  function visitStatement(path, state) {\n    instrument(path, state, {\n      tags: ['statement', 'line'],\n      loc: path.node.loc,\n    });\n  }\n\n  /**\n   * The function visitor is mainly to track the definitions of functions;\n   * being able ensure how many of your functions have actually been invoked.\n   * @param {[type]} path  [description]\n   * @param {[type]} state [description]\n   * @returns {void}\n   */\n  function visitFunction(path, state) {\n    instrument(path.get('body'), state, {\n      tags: ['function'],\n      name: path.node.id ? path.node.id.name : `@${key(path)}`,\n      loc: path.node.loc,\n    });\n  }\n\n  /**\n   * Multiple branches based on the result of `case _` and `default`. If you\n   * do not provide a `default` one will be intelligently added for you,\n   * forcing you to cover that case.\n   * @param {[type]} path  [description]\n   * @param {[type]} state [description]\n   * @returns {void}\n   */\n  function visitSwitchStatement(path, state) {\n    let hasDefault = false;\n    path.get('cases').forEach((entry) => {\n      if (entry.node.test) {\n        addRules(state, entry.node.loc, entry.node.test.trailingComments);\n      }\n      if (entry.node.consequent.length > 1) {\n        addRules(\n          state,\n          entry.node.loc,\n          entry.node.consequent[0].leadingComments\n        );\n      }\n\n      if (entry.node.test === null) {\n        hasDefault = true;\n      }\n      entry.unshiftContainer('consequent', createMarker(state, {\n        tags: ['branch', 'switch'],\n        loc: entry.node.loc,\n        group: key(path),\n      }));\n    });\n\n    // Default is technically a branch, just like if statements without\n    // else's are also technically a branch.\n    if (!hasDefault) {\n      // Add an extra break to the end of the last case in case some idiot\n      // forgot to add it.\n      const cases = path.get('cases');\n      if (cases.length > 0) {\n        cases[cases.length - 1].pushContainer(\n          'consequent',\n          types.breakStatement()\n        );\n      }\n      // Finally add the default case.\n      path.pushContainer('cases', types.switchCase(null, [\n        types.expressionStatement(createMarker(state, {\n          tags: ['branch', 'switch'],\n          loc: {\n            start: path.node.loc.end,\n            end: path.node.loc.end,\n          },\n          group: key(path),\n        })),\n        types.breakStatement(),\n      ]));\n    }\n  }\n\n  /**\n   * [visitVariableDeclaration description]\n   * @param {[type]} path  [description]\n   * @param {[type]} state [description]\n   * @returns {void}\n   */\n  function visitVariableDeclaration(path, state) {\n    path.get('declarations').forEach((decl) => {\n      if (decl.has('init')) {\n        instrument(decl.get('init'), state, {\n          tags: ['statement', 'variable', 'line'],\n        });\n      }\n    });\n  }\n\n  /**\n   * Includes both while and do-while loops. They contain a single branch which\n   * tests the loop condition.\n   * @param {[type]} path  [description]\n   * @param {[type]} state [description]\n   * @returns {void}\n   */\n  function visitWhileLoop(path, state) {\n    const test = path.get('test');\n    const group = key(path);\n    // This is a particularly clever use of the fact JS operators are short-\n    // circuiting. To instrument a loop one _cannot_ add a marker on the outside\n    // of the loop body due to weird cases of things where loops are in non-\n    // block if statements. So instead, create the following mechanism:\n    // ((condition && A) || !B) where A and B are markers. Since markers are\n    // postfix, they're always true. Ergo, A is only incremented when condition\n    // is true, B only when it's false and the truth value of the whole\n    // statement is preserved. Neato.\n    test.replaceWith(types.logicalExpression(\n      '||',\n      types.logicalExpression(\n        '&&',\n        X(test.node),\n        createMarker(state, {\n          tags: ['branch', 'line', 'statement', 'loop', 'while'],\n          loc: test.node.loc,\n          group,\n        })\n      ),\n      types.unaryExpression(\n        '!',\n        createMarker(state, {\n          tags: ['branch', 'line', 'loop', 'while'],\n          loc: test.node.loc,\n          group,\n        })\n      )\n    ));\n  }\n\n  /**\n   * The try block can either fully succeed (no error) or it can throw. Both\n   * cases are accounted for.\n   * @param {[type]} path  [description]\n   * @param {[type]} state [description]\n   * @returns {void}\n   */\n  function visitTryStatement(path, state) {\n    const group = key(path);\n    const body = path.get('block');\n    const trigger = path.scope.generateDeclaredUidIdentifier('_exception');\n    addRules(state, body.node.loc, body.node.leadingComments);\n    path.get('block').unshiftContainer('body', types.expressionStatement(\n      types.assignmentExpression('=', tri