Class: MixCompiler

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/ruby/mix.tab.rb,
lib/ruby/compiler.rb

Constant Summary collapse

Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
"$end",
"error",
"\"!\"",
"\"-\u{b7}\"",
"\"-1\"",
"\"*\"",
"\"/\"",
"\"%\"",
"\"+\"",
"\"-\"",
"\"<<\"",
"\">>\"",
"\"<\"",
"\"<=\"",
"\">\"",
"\">=\"",
"\"==\"",
"\"!=\"",
"\"&&\"",
"\"||\"",
"\"?\"",
"\":\"",
"\"=\"",
"\"&&=\"",
"\"||=\"",
"\"\u{b7}=\"",
"IF",
"UNLESS",
"WHILE",
"UNTIL",
"\";\"",
"NEWLINE",
"MIXIN",
"INDENT",
"OUTDENT",
"IDENTIFIER",
"\"#\"",
"\"|\"",
"\",\"",
"SWITCH",
"ELSIF",
"ELSE",
"CASE",
"BREAK",
"RETURN",
"\"(\"",
"\")\"",
"\".\"",
"\"\u{b7}[\"",
"\"]\"",
"\"\u{b7}#\"",
"\"\u{b7}:\"",
"NUMBER",
"\"'\"",
"STRING",
"APP",
"FALSE",
"NULL",
"SELF",
"TRUE",
"\"[\"",
"\"{\"",
"\"}\"",
"KEY",
"$start",
"statements",
"statement",
"indented_statement",
"inline_statements",
"opt_semicolon",
"newline",
"mixin_statement",
"control_statement",
"function_statement",
"mixin_body",
"definitions",
"definition",
"function_block",
"inline_function",
"parameter_list",
"indent_block",
"parameters",
"@1",
"exp",
"else_statement",
"opt_else",
"cases",
"case",
"inline_statement",
"postfix_statement",
"mix_statement",
"keyword_statement",
"object",
"dot_access",
"arguments",
"functional_object",
"lhs",
"literal",
"literal_number",
"literal_string",
"literal_constant",
"literal_array",
"literal_object",
"opt_comma",
"fields",
"parenthetical",
"call",
"curly_brace_block" ]
Racc_debug_parser = 
false
NODE_TYPES = 
{}
OPERATORS = 
{
  '+' => :plus, '-' => :minus,
  '*' => :star, '/' => :slash, '%' => :percent,
  '>' => :gt, '>>' => :gtgt, '>=' => :gteq,
  '<' => :lt, '<<' => :ltlt, '<=' => :lteq,
  '==' => :eq, '!=' => :neq
}

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ MixCompiler

Returns a new instance of MixCompiler.



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# File 'lib/ruby/compiler.rb', line 8

def initialize (filename)
  @primary_filename = filename
end

Instance Method Details

#_reduce_none(val, _values) ⇒ Object 



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# File 'lib/ruby/mix.tab.rb', line 1392

def _reduce_none(val, _values)
  val[0]
end

#append_statement(outermost_statement, final_statement) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 33

def append_statement (outermost_statement, final_statement)
  current = outermost_statement
  
  current = current[:values][1] while current[:values][1]
  current[:values][1] = final_statement
  
  outermost_statement
end

#build_script ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 42

def build_script
  script = File.open(@primary_filename) {|f| "#{f.read}\n" }
  files = {'mix' => [], 'js' => %w[base/env.js base/eval.js base/object.js base/array.js base/false.js base/function.js base/null.js base/number.js base/string.js base/true.js]}
  
  @unordered_mix_filenames = [@primary_filename]
  
  scan_includes(script, files)
  files['mix'].push [@primary_filename, script]
  
  @js_filenames = files['js']
  @filenames = files['mix'].map {|name,*| name }
  @script = files['mix'].map {|*,script| script }.join("\034")
end

#compile ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 66

def compile
  build_script
  node = parse
  node_string = js(node)
  symbol_string = @symbols.keys.map {|s| "'#{s}'" }.join ?,
  
  js_file_string = @js_filenames.map do |filename|
    File.read(File.expand_path('../../javascript/' + filename, __FILE__))
  end.join ?\n
  
  precompile(js_file_string)
  
  <<-JAVASCRIPT
mix_result_should_be_undefined = function ()
{

var HTML_TYPES = {};
var SYMBOLS = [#{symbol_string.force_encoding('US-ASCII')}];
#{js_file_string}

window.onload = function ()
{
startup();
evaluate(#{node_string});
}

}();
  JAVASCRIPT
  
rescue SyntaxError => e
  "window.onload = function () { if (console && console.log) console.log(\"SyntaxError: #{e.message}\"); };"
end

#getch ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 99

def getch
  @script[@pointer += 1]
end

#js(node) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 103

def js (node)
  return "0" unless node
  
  t = node[:type]
  a, b, c = node[:values]
  args = [NODE_TYPES[t]]
  
  case (t = node[:type])
    when :access_brackets, :and, :or, :set, :statement, :while
      args << js(a) << js(b)
    
    when :access_colon, :access_hash, :mix
      args << js(a) << @symbols[b.to_sym]
    
    when :app, :false, :null, :self, :true
      nil
    
    when :array
      items = a.map {|x| js(x) }.join ?,
      args << "[#{items}]"
    
    when :break, :not, :return
      args << js(a)
    
    when :call
      function = js(a)
      arguments = b.map {|x| js(x) }.join ?,
      
      args << function << "[#{arguments}]"
    
    when :function
      parameters = a[0].map {|x| @symbols[x.to_sym] }.join ?,
      variables = a[1].map {|x| @symbols[x.to_sym] }.join ?,
      body = js(b)
      
      args << "[[#{parameters}],[#{variables}]]" << body
    
    when :if
      args << js(a) << js(b) << js(c)
    
    when :mixin
      name = @symbols[a.to_sym]
      init_statement = js(b[0])
      definitions = b[1].map {|s| js(s) }.join ?,
      
      args << name << init_statement << "[#{definitions}]"
    
    when :newline
      file, line = @symbols[a[0].to_sym], a[1]
      statement = js(b)
      
      args << file << line << statement
    
    when :number
      args << a
    
    when :object
      entries = a.map {|kv| "[#{@symbols[kv[0].to_sym]},#{js(kv[1])}]" }.join ?,
      mixins = b.map {|x| @symbols[x.to_sym] }.join ?,
      
      args << "[#{entries}]" << "[#{mixins}]"
    
    when :op
      args << @symbols[OPERATORS[a]] << js(b) << js(c)
    
    when :string, :variable
      args << @symbols[a.to_sym]
    
    when :switch
      condition = js(a)
      cases = b.map {|x| "[#{js(x[0])},#{js(x[1])}]" }.join ?,
      else_case = js(c)
      
      args << condition << cases << else_case
    
    else
      raise "BUG: node type :#{t} not implemented in MixCompiler#js"
  end
  
  return "[#{args.join ?,}]"
end

#newline(statement_node) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 185

def newline (statement_node)
  statement_node[:values][0] = node(:newline, @location, statement_node[:values][0])
  statement_node
end

#next_token ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 190

def next_token
  @tokens.shift
end

#node(type, *values) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 194

def node (type, *values)
  { type: type, values: values }
end

#on_error(token, value, stack) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/ruby/compiler.rb', line 198

def on_error (token, value, stack)
  if value
    value, file, line = value[0].inspect, *value[1]
  else
    value, file, line = 'EOF', @primary_filename, @line
  end
  
  raise SyntaxError, "Unexpected token #{token_to_str(token)} (#{value}): #{file}:#{line}".gsub(?",'\"')
end

#parameter(name) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 208

def parameter (name)
  @variables[:parameters] << name
  @variables[:local] << name
end

#parse ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 213

def parse
  tokenize
  symbol_index = -1
  @symbols = Hash.new {|h,k| h[k] = (symbol_index += 1) }
  @variables = { parameters: [], local: [], embedded: [], prev: nil }
  
  return do_parse
end

#pop_variables ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 222

def pop_variables
  vars = [@variables[:parameters], @variables[:embedded]]
  @variables = @variables[:prev]
  
  return vars
end

#precompile(js_file_string) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 56

def precompile (js_file_string)
  NODE_TYPES.each {|k,v| js_file_string.gsub!("case #{k}:","case #{v}:") }
  
  %w:ARRAY ELEMENT EVENT FALSE FUNCTION NULL NUMBER OBJECT STRING TEXT TRUE:.each_with_index do |t,i|
    js_file_string.gsub!("#{t}_TYPE","#{i}")
  end
  
  js_file_string.gsub!(/\s*\/\*.*?\*\/\s*/m,"\n").gsub!(/\s*\n\s*/,?\n).gsub!(/\s*([{;:,=])\s*/,'\1').gsub!("\n}",'}')
end

#push_variables ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 229

def push_variables
  embedded = @variables[:local] + @variables[:embedded]
  @variables = { parameters: [], local: [], embedded: embedded, prev: @variables }
end

#scan_includes(script, files) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 242

def scan_includes (script, files)
  require 'strscan'
  
  ss = StringScanner.new(script)
  js_filenames = []
  
  while ss.scan(/~~\s+(.*\.(js|mix))\s*\n/)
    name = ss[1]
    type = ss[2]
    
    if type == 'mix'
      unless @unordered_mix_filenames.include?(name)
        script = File.open(name) {|f| "#{f.read}\n" }
        @unordered_mix_filenames << name
        scan_includes(script, files)
        files['mix'].push [name,script]
      end
    else
      js_filenames << name
    end
  end
  
  files['js'] |= js_filenames
end

#token(token, value = token) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 267

def token (token, value = token)
  @tokens << [token, [value, [@filename, @line]]]
end

#tokenize ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 271

def tokenize
  @filename = @filenames[file_index = 0]
  @line = 1
  @pointer = -1
  @indent_stack = [0]
  @state = :newline
  @tokens = []
  
  empty_lines = 0
  
  while c = getch
    case c
      when ?\034
        @filename = @filenames[file_index += 1]
        @line = 1
      
      when ?~
        if getch == ?~
          :skip until getch =~ /\n/
          unscan
          next
        end
        
        unscan
        :skip while getch =~ /\s/
        unscan
      
      when ' ', ?\t
        @state = :space if @state == :reference
      
      when ?\n
        if @state == :newline
          empty_lines += 1
          next
        end
        
        current_indent = 0
        previous_indent = @indent_stack.last
        
        while (c = getch) == ' '
          current_indent += 1
        end
        
        unscan
        
        if c == ?\n
          empty_lines += 1
          next
        end
        
        @state = :newline
        token :NEWLINE
        
        @line += (empty_lines + 1)
        empty_lines = 0
        
        if current_indent > previous_indent
          @indent_stack << current_indent
          token :INDENT
        elsif current_indent < previous_indent
          unless @indent_stack.include?(current_indent)
            raise(SyntaxError, "Indent error: #{@filename}:#{@line}")
          end
          
          until @indent_stack.last == current_indent
            @indent_stack.pop
            token :OUTDENT
          end
        end
      
      when ?!, ?=
        @state = :begin
        
        if getch == ?=
          token c + '='
        else
          unscan
          token c
        end
      
      when ?+, ?*, ?/, ?%
        @state = :begin
        
        if getch == ?=
          token '·=', c
        else
          unscan
          token c
        end
      
      when ?-
        if getch == ?=
          token '·=', c
        elsif c =~ /[0-9]/
          token '-1'
          unscan
        else
          unscan
          
          if @state == :begin || @state == :newline
            token '-·'
          else
            token '-'
          end
        end
        
        @state = :begin
      
      when ??, ?., ?;, ?,, ?(, ?{
        @state = :begin
        token c
      
      when ?'
        @state = :reference
        
        s = ""
        
        until (c = getch) == ?'
          s << c
        end
        
        token '\''
        token :STRING, s
        token '\''
      
      when ?>, ?<
        @state = :begin
        
        if getch == c
          if getch == ?=
            token '·=', c * 2
          else
            unscan
            token c * 2
          end
        else
          unscan
          
          if getch == ?=
            token c + '='
          else
            unscan
            token c
          end
        end
      
      when ?&, ?|
        @state = :begin
        
        if getch == c
          if getch == ?=
            token c + c + '='
          else
            unscan
            token c + c
          end
        else
          unscan
          token c
        end
      
      when /[0-9]/
        @state = :reference
        value = c
        
        while (c = getch) =~ /[0-9]/
          value << c
        end
        
        unscan
        
        token :NUMBER, value.to_i
      
      when ?], ?}, ?)
        @state = :reference
        token c
      
      when ?:, ?[, ?#
        if @state == :reference
          token '·' + c
        else
          token c
        end
        
        @state = :begin
      
      when /[A-Z]/
        @state = :begin
        value = c
        
        while (c = getch) =~ /[_a-zA-Z0-9]/
          value << c
        end
        
        unscan
        
        token :MIXIN, value.to_sym
      
      when /[_a-z]/
        @state = :reference
        value = c
        
        while (c = getch) =~ /[_a-zA-Z0-9]/
          value << c
        end
        
        if c == ?:
          if getch =~ /[a-z]/
            unscan
          else
            @state = :begin
            token :KEY, value.to_sym
            unscan
            next
          end
          
          unscan
        elsif c == ?? || c == ?!
          value << c
        else
          unscan
        end
        
        if %w:
          app break case
          elsif else false if
          null return self
          switch true unless
          until while
        :
        .include?(value)
          token value.upcase.to_sym
        else
          token :IDENTIFIER, value.to_sym
        end
        
        case c = getch
          when ?:, ?#
            token '·' + c
          when ?[
            token '·['
            @state = :begin
          else
            unscan
        end
      
      else
        raise SyntaxError, "Invalid token `#{c}': #{@filename}:#{@line}"
    end
  end
  
  @tokens << [false, false]
end

#unscan ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 525

def unscan
  @pointer -= 1
end

#variable(name) ⇒ Object 



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# File 'lib/ruby/compiler.rb', line 234

def variable (name)
  unless (@variables[:local] + @variables[:embedded]).include?(name)
    @variables[:local] << name
  end
  
  node :variable, name
end