no_interpolation_in_single_quotes.coffee

module.exports = class NoInterpolationInSingleQuotes

    rule:
        name: 'no_interpolation_in_single_quotes'
        level: 'ignore'
        message: 'Interpolation in single quoted strings is forbidden'
        description: '''
            This rule prohibits string interpolation in a single quoted string.
            <pre>
            <code># String interpolation in single quotes is not allowed:
            foo = '#{bar}'

            # Double quotes is OK of course
            foo = "#{bar}"
            </code>
            </pre>
            String interpolation in single quoted strings is permitted by
            default.
            '''

    tokens: ['STRING']

    lintToken: (token, tokenApi) ->
        tokenValue = token[1]
        hasInterpolation = tokenValue.match(/^\'.*#\{[^}]+\}.*\'$/)
        return hasInterpolation