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114 lines
2.7 KiB
Markdown
114 lines
2.7 KiB
Markdown
5 years ago
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# call-signature [](https://travis-ci.org/jamestalmage/call-signature)
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> Parse / Generate Method Signatures
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## Install
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```
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$ npm install --save call-signature
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```
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## Usage
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```js
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var signature = require('call-signature');
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// parse a call signature definition
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var parsed = signature.parse('t.equal(expected, actual, [message])');
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console.log(parsed);
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/* =>
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{
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callee: {
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type: 'MemberExpression',
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object: 't',
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member: 'equal'
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},
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args: [
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{
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name: 'actual',
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optional: false
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},
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{
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name: 'expected',
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optional: false
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},
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{
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name: 'message',
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optional: true
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}
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]
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}
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*/
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// Create signature definitions from the parsed object.
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signature.generate(parsed);
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//=> "t.equal(expected, actual, [message])"
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```
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## API
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### callSignature.parse(input)
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#### input
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Type: `string`
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A string that matches the call signature spec:
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`object.member(required_arg1, required_arg2, [optional_arg1])`
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`name(required_arg1, required_arg2, [optional_arg1])`
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`object`, `member` and `name` can be any identifiers, but currently the callee must be a `MemberExpression` or an `Identifier` (that requirement may loosen in the future).
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You can have any number of arguments. Optional arguments are denoted by placing the argument name between square `[`brackets`]`.
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#### returns
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A simple JS Object with three properties `callee` and `args`.
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`callee` will be an object containing `type` property and its corresponding properties.
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when matched against `MemberExpression` like `foo.bar(baz)`, `object` and `member` will be strings.
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callee: {
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type: 'MemberExpression',
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object: 'foo',
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member: 'bar'
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}
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when matched against `Identifier` like `foo(baz)`, `name` will be string.
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callee: {
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type: 'Identifier',
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name: 'foo'
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}
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`args` will be an array. Each item of the array will have two properties `name`, and `optional`.
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`name` will be the `string` name of the arg. `optional` will be a boolean value.
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### callSignature.generate(parsed)
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#### input
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Type: `Object`
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Must have the same definition as the return value from the `parse` method.
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#### returns
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A `string` signature definition that will parse to exactly the provided input.
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## Related
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- [escallmatch](https://www.npmjs.com/package/escallmatch) - Similar, with compatible string definitions to this library. Can be used to match AST Nodes to parsed signatures.
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## License
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MIT © [James Talmage](http://github.com/jamestalmage)
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