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194 lines
6.6 KiB
Markdown
194 lines
6.6 KiB
Markdown
6 years ago
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call-matcher
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================================
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ECMAScript CallExpression matcher made from function/method signature
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[![Build Status][travis-image]][travis-url]
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[![NPM version][npm-image]][npm-url]
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[![License][license-image]][license-url]
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EXAMPLE
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---------------------------------------
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Creating CallExpression matcher for method signature `'assert.equal(actual, expected, [message])'`.
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Then match against `path/to/some_test.js`.
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```javascript
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var CallMatcher = require('call-matcher');
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var esprima = require('esprima');
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var estraverse = require('estraverse');
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var fs = require('fs');
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var ast = esprima.parse('assert.equal(actual, expected, [message])');
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var expression = ast.body[0].expression;
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var matcher = new CallMatcher(expression);
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estraverse.traverse(esprima.parse(fs.readFileSync('path/to/some_test.js')), {
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enter: function (currentNode, parentNode) {
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if (matcher.test(currentNode)) {
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// currentNode is a CallExpression that matches to the signature
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}
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var argMatched = matcher.matchArgument(currentNode, parentNode);
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if (argMatched) {
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if (argMatched.kind === 'mandatory') {
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// mandatory arg (in this case, `actual` or `expected`)
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} else if (argMatched.kind === 'optional') {
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// optional arg (in this case, `message`)
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}
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}
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}
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});
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```
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where content of `path/to/some_test.js` is:
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```javascript
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var assert = require('assert');
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var anotherAssert = assert;
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var equal = assert.equal.bind(assert);
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var foo = '2';
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var bar = 2;
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assert.equal(foo, bar); // matches
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assert.equal(bar, foo); // matches
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assert.equal(foo, bar, 'foo shoule be equal to bar'); // matches (with optional arg)
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assert.equal(); // does not match (less args)
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assert.equal(foo); // does not match (less args)
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assert.equal(foo, bar, 'hoge', 'fuga'); // does not match (too much args)
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assert.notEqual(foo, bar); // does not match (callee method name differs)
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anotherAssert.equal(foo, bar); // does not match (callee object name differs)
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equal(foo, bar); // does not match (callee does not match)
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```
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`call-matcher` is a spin-off product of [power-assert](https://github.com/twada/power-assert) project.
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Pull-requests, issue reports and patches are always welcomed.
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API
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---------------------------------------
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### var matcher = new CallMatcher(signatureAst, [options])
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Create matcher object for a given expression.
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```javascript
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var ast = esprima.parse('assert.equal(actual, expected, [message])');
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var expression = ast.body[0].expression;
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var matcher = new CallMatcher(expression);
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```
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Any signature string enclosed in bracket (for example, `[message]`) means optional parameters. Without bracket means mandatory parameters.
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Returns `matcher` object having four methods, `test`, `matchArgument`, `calleeAst`, and `argumentSignatures`.
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#### options
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an `object` for configuration options. If not passed, default options will be used.
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#### options.visitorKeys
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| type | default value |
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|:---------|:--------------|
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| `object` | (return value of `estraverse.VisitorKeys`) |
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VisitorKeys for AST traversal. See [estraverse.VisitorKeys](https://github.com/estools/estraverse/blob/4.0.0/estraverse.js#L217-L288) and [babel.types.VISITOR_KEYS](https://github.com/babel/babel/blob/v5.1.11/src/babel/types/visitor-keys.json).
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#### options.astWhiteList
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| type | default value |
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|:---------|:--------------|
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| `object` | N/A |
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Type and property whitelist on creating AST clone. `astWhiteList` is an object containing NodeType as keys and properties as values.
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```js
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{
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ArrayExpression: ['type', 'elements'],
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ArrayPattern: ['type', 'elements'],
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ArrowFunctionExpression: ['type', 'id', 'params', 'body', 'generator', 'expression'],
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AssignmentExpression: ['type', 'operator', 'left', 'right'],
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...
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```
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### var isMatched = matcher.test(node)
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Tests whether `node` matches the signature or not.
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- Returns `true` if matched.
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- Returns `false` if not matched.
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`node` should be an AST node object defined in [The ESTree Spec](https://github.com/estree/estree) (formerly known as [Mozilla SpiderMonkey Parser API](https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API)).
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### var argMatched = matcher.matchArgument(node, parentNode)
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Returns match result object representing whether `node` (and its `parentNode`) matches some argument of the signature or not.
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- Returns `null` if not matched.
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- If matched, returns object like `{index: 0, name: 'actual', kind: 'mandatory'}`, whose `index` is an index of matched argument, `name` is an argument name in the signature and `kind` is `'mandatory'` or `'optional'`.
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`node` and `parentNode` should be AST node objects defined in [The ESTree Spec](https://github.com/estree/estree) (formerly known as [Mozilla SpiderMonkey Parser API](https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API)).
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### var calleeAst = matcher.calleeAst()
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Returns clone of callee AST object based on signature passed to `CallMatcher` function. Returned tree is one of AST node objects defined in [The ESTree Spec](https://github.com/estree/estree) (formerly known as [Mozilla SpiderMonkey Parser API](https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API)) (in most cases, `Identifier` or `MemberExpression`).
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### var argSigs = matcher.argumentSignatures()
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Returns array of argument signature objects based on signature passed to `CallMatcher` function. Returns array of objects like `[{index: 0, name: 'actual', kind: 'mandatory'}]`, whose `index` is an index of matched argument, `name` is an argument name in the signature and `kind` is `'mandatory'` or `'optional'`.
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INSTALL
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---------------------------------------
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### via npm
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Install
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$ npm install --save call-matcher
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#### use call-matcher module on browser
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`CallMatcher` function is exported
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<script type="text/javascript" src="./path/to/node_modules/call-matcher/dist/call-matcher.js"></script>
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CHANGELOG
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---------------------------------------
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See [CHANGELOG](https://github.com/twada/call-matcher/blob/master/CHANGELOG.md)
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AUTHOR
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---------------------------------------
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* [Takuto Wada](https://github.com/twada)
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LICENSE
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---------------------------------------
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Licensed under the [MIT](https://github.com/twada/call-matcher/blob/master/MIT-LICENSE.txt) license.
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[npm-url]: https://npmjs.org/package/call-matcher
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[npm-image]: https://badge.fury.io/js/call-matcher.svg
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[travis-url]: https://travis-ci.org/twada/call-matcher
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[travis-image]: https://secure.travis-ci.org/twada/call-matcher.svg?branch=master
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[license-url]: https://github.com/twada/call-matcher/blob/master/MIT-LICENSE.txt
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[license-image]: https://img.shields.io/badge/license-MIT-brightgreen.svg
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