Class: MixPrecompiler

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby/precompiler.rb

Constant Summary collapse

JS_BASE_FILES = 
%w{
  env eval object array
  false function null
  number string true }
.each_with_object({}) do |x,h|
  filename = File.expand_path("../../javascript/base/#{x}.js", __FILE__)
  h[filename] = File.read(filename)
end
JS_OBJECT_TYPES = 
%w=
ARRAY ELEMENT EVENT
FALSE FUNCTION NULL
NUMBER OBJECT STRING
TEXT TRUE =

Instance Method Summary collapse

Instance Method Details

#build_js_string ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 23

def build_js_string
  @js_string = @js_files.map {|*,script| script }.join ?\n
  
  replace_type_variables
  replace_case_markers
  minify
  
  @js_string = "mix_result_should_be_undefined=function(){var SYMBOLS='...Replace with symbol table...';\#{@js_string};\nwindow.onload=function(){startup();evaluate('...Replace with AST nodes...');}}();\n"
end

#collect_scripts ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 36

def collect_scripts
  @mix_files = {}
  @js_files = JS_BASE_FILES.dup
  
  scan_mix_file(@primary_filename)
end

#minify ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 43

def minify
  @js_string.gsub!(/\s*\/\*.*?\*\/\s*/m, ?\n)
  @js_string.gsub!(/\s*\n\s*/, ?\n)
  @js_string.gsub!(/\s*([{;:,=])\s*/, '\1')
  @js_string.gsub!("\n}", ?})
end

#precompile(filename) ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 50

def precompile (filename)
  @primary_filename = filename
  collect_scripts
  build_js_string
  
  return @mix_files, @js_string
end

#replace_case_markers ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 58

def replace_case_markers
  MixTranslator::NODE_TYPES.each do |k,v|
    @js_string.gsub!("case #{k}:","case #{v}:")
  end
end

#replace_type_variables ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 64

def replace_type_variables
  JS_OBJECT_TYPES.each_with_index do |t,i|
    @js_string.gsub!("#{t}_TYPE", i.to_s)
  end
end

#scan_includes(script) ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 70

def scan_includes (script)
  ss = StringScanner.new(script)
  js_filenames = []
  
  while ss.scan(/~~\s*(.*)\.(js|mix)\s*\n/)
    basename = ss[1]
    type = ss[2]
    filename = "#{basename}.#{type}"
    
    if type == 'mix'
      unless [@primary_filename, *@mix_files.keys].include?(filename)
        scan_mix_file(filename)
      end
    else
      js_filenames << filename
    end
  end
  
  js_filenames.each do |name|
    filename = File.expand_path("../../javascript/#{name}", __FILE__)
    next if @js_files.has_key?(filename)
    @js_files[filename] = File.read(filename)
  end
end

#scan_mix_file(filename) ⇒ Object 



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# File 'lib/ruby/precompiler.rb', line 95

def scan_mix_file (filename)
  unless File.exists? filename
    puts "no such file #{filename}"
    exit
  end
  
  script = File.read(filename) + ?\n
  scan_includes(script)
  
  @mix_files[filename] = script
end