Class: Syntax::Javascript

Inherits:
Tokenizer show all
Defined in:
lib/syntax/lang/javascript.rb

Constant Summary collapse

JAVASCRIPT_KEYWORDS =
Set.new %w{abstract break case catch class const continue
debugger default delete do else enum export extends
final finally for function goto if implements
import in instanceof interface native new
package private protected public return
static super switch synchronized this throw
throws transient try typeof
var void volatile while with}
JAVASCRIPT_PREDEFINED_TYPES =
Set.new %w{boolean byte char double float int long short}
JAVASCRIPT_PREDEFINED_CONSTANTS =
%w{null true false}

Instance Attribute Summary

Attributes inherited from Tokenizer

#chunk, #group

Instance Method Summary collapse

Methods inherited from Tokenizer

#finish, #option, #set, #setup, #start, #teardown, #tokenize

Instance Method Details

#stepObject


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# File 'lib/syntax/lang/javascript.rb', line 23

def step
  case
  when scan(/\s+/)
    start_group :normal, matched
  when scan(/\\u[0-9a-f]{4}/i)
    start_group :unicode, matched
  when scan(/0[xX][0-9A-Fa-f]+/)
    start_group :hex, matched
  when scan(/(?:0[0-7]+)(?![89.eEfF])/)
    start_group :oct, matched
  when scan(/(?:\d+)(?![.eEfF])/)
    start_group :integer, matched
  when scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
    start_group :float, matched
  when (scan(/"(?:[^"\\]|\\.)*"/) or scan(/'(?:[^'\\]|\\.)*'/) )
    start_group :string, matched
  when scan(/[a-z_$][a-z_\d]*/i)
    if JAVASCRIPT_KEYWORDS.include?( matched )
      start_group :keyword, matched
    elsif JAVASCRIPT_PREDEFINED_TYPES.include?( matched )
      start_group :predefined_types, matched
    else
      start_group :ident, matched
    end
  when scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
    start_group :comment, matched
  else
    start_group :other, scan(/./x)
  end
end