Class: JSLint

Inherits:
Object
  • Object
show all
Defined in:
lib/support/jslint/jslint_checker.rb

Constant Summary collapse

OK_REASONS = 
[ "Expected an identifier and instead saw 'undefined' (a reserved word).",
"Use '===' to compare with 'null'.",
"Use '!==' to compare with 'null'.",
"Expected an assignment or function call and instead saw an expression.",
"Expected a 'break' statement before 'case'.",
"'e' is already defined." ]
LINT_PATH = 
File.join(File.dirname(__FILE__), "lint.js")

Class Method Summary collapse

Class Method Details

.lint_file(file) ⇒ Object 



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# File 'lib/support/jslint/jslint_checker.rb', line 12

def self.lint_file(file)
  begin
    require 'rubygems'
    require 'v8'
  rescue LoadError
    puts "ERROR: Couldn't load therubyracer, which is needed to run JSLint checks. Install via \"gem install therubyracer\", or disable the JS lint checks."
    return []
  end

  errors = []
  V8::Context.new do |context|
    context.load(LINT_PATH)
    context['input'] = lambda{
      File.read(file)
    }

    context['reportErrors'] = lambda{|js_errors|
      js_errors.each do |e|
        next if e.nil? || OK_REASONS.include?(e.reason)

        errors << "\n\e[1;31mJSLINT: #{file}\e[0m"
        errors << "  Error at line #{e['line'].to_i + 1} " + 
          "character #{e['character'].to_i + 1}: \e[1;33m#{e['reason']}\e[0m"
        errors << "#{e['evidence']}"
      end
    }

    context.eval %{
        JSLINT(input(), { evil: true, forin: true, maxerr: 100 });
        reportErrors(JSLINT.errors);
      }
  end

  return errors
end