pugjs/is-expression

Name: is-expression

Owner: Pug

Description: Validates a string as a JavaScript expression

Created: 2015-11-12 01:31:44.0

Updated: 2017-04-24 22:23:18.0

Pushed: 2018-05-07 15:27:11.0

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Size: 20

Language: JavaScript

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README

is-expression

Validates a string as a JavaScript expression

Installation

npm install is-expression

Usage

isExpression(src[, options])

Validates a string as a JavaScript expression.

src contains the source.

options can contain any Acorn options (since we use Acorn under-the-hood), or any of the following:

• throw: Throw an error if the string is not an expression. The error can be an Acorn error, with location information in err.loc and err.pos. Defaults to false.
• strict: Use strict mode when trying to parse the string. Defaults to false. Even if this option is false, if you have provided options.sourceType === 'module' which imples strict mode under ES2015, strict mode will be used.
• lineComment: When true, allows line comments in the expression. Defaults to false for safety.

See the examples below for usage.

Examples

isExpression = require('is-expression')

pression('myVar')
 true
pression('var')
 false
pression('["an", "array", "\'s"].indexOf("index")')
 true

pression('var', {throw: true})
yntaxError: Unexpected token (1:0)
   at Parser.pp.raise (acorn/dist/acorn.js:940:13)
   at ...

pression('public')
 true
pression('public', {strict: true})
 false

pression('abc // my comment')
 false
pression('abc // my comment', {lineComment: true})
 true

License

MIT