Module: GenMachine::Helpers::Ruby

Included in:
Generators::RubyGenerator
Defined in:
lib/genmachine/generators/ruby/helper.rb

Constant Summary collapse

INPUT = 
'__i'
STATE = 
'__state'

Instance Method Summary collapse

Instance Method Details

#rb_acc_commands(acc_phrase) ⇒ Object 



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# File 'lib/genmachine/generators/ruby/helper.rb', line 102

def rb_acc_commands(acc_phrase)
  case
  when (acc_phrase.nil? or acc_phrase == '')
    return ['@fwd=true']
  when acc_phrase.strip == '>>'
    return []
  when acc_phrase =~ /^\s*([a-zA-Z_][a-zA-Z0-9_.]*)\s*>>\s*$/
    return ["#{rb_vars($1)}.reset!"]
  when acc_phrase =~ /^\s*(["'a-zA-Z_][^>]*)\s*>>\s*([a-zA-Z_][a-zA-Z0-9_.]*)\s*$/
    return ["#{rb_vars($1)}.into(#{rb_vars($2)})"]
  when acc_phrase =~ /^\s*(["'a-zA-Z_][^>]*)\s*>>>\s*([a-zA-Z_][a-zA-Z0-9_.]*)\s*$/
    return ["#{rb_vars($1)}.into!(#{rb_vars($2)})"]
  else raise("Can't figure out your accumulator statement: #{acc_phrase}")
  end
end

#rb_charset_cond(input, has_eof_state, sep = '||') ⇒ Object 



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# File 'lib/genmachine/generators/ruby/helper.rb', line 19

def rb_charset_cond(input,has_eof_state,sep='||')
  return 'true' if input.nil?
  outs = []
  sep = '||' if input[:kind] == :exclude
  input[:ranges].each do |range|
    if input[:kind] == :include
      if range.is_a? Array
        outs << "nl?" if (range[0] <= 0x0a) && (range[1] >= 0x0a)
        outs << "space?" if (range[0] <= 0x20) && (range[1] >= 0x20)
        outs << "(#{INPUT}>#{range[0]-1}&&#{INPUT}<#{range[1]+1})"
      else
        outs << case range
                when 0x0a; 'nl?'
                when 0x20; 'space?'
                when :any; has_eof_state ? 'true' : '!eof?'
                else "#{INPUT}==#{range}" end
      end
    end
  end
  out = outs.join(sep)
  out = '!('+out+')' if input[:kind] == :exclude
  return out
end

#rb_commands(clause, currstate) ⇒ Object 



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# File 'lib/genmachine/generators/ruby/helper.rb', line 43

def rb_commands(clause,currstate)
  cmds = []
  cmds += rb_simple_acc_commands(clause[:acc])
  clause[:exprs].each do |expr|
    if expr.include? '>>'
      cmds += rb_acc_commands(expr)
    else
      cmds << rb_vars(expr.strip)
    end
  end
  cmds += rb_transition_commands(clause[:next],currstate)
  return cmds.join('; ')
end

#rb_conditional(clause, states, clauses) ⇒ Object 



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# File 'lib/genmachine/generators/ruby/helper.rb', line 7

def rb_conditional(clause,states,clauses)
  has_eof_state = eof_state?(states) || eof_clause?(clauses)
  out = ''
  if clause[:cond].size > 0
    out += '('+clause[:cond].join(' || ')+')'
    out += "&& (#{rb_charset_cond(clause[:input],has_eof_state)})" unless clause[:input].nil?
  else
    out += rb_charset_cond(clause[:input],has_eof_state,',')
  end
  return rb_vars(out)
end

#rb_simple_acc_commands(acc_phrase) ⇒ Object 



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# File 'lib/genmachine/generators/ruby/helper.rb', line 92

def rb_simple_acc_commands(acc_phrase)
  case
  when (acc_phrase.nil? or acc_phrase == ''); return ['@fwd=true']
  when acc_phrase.strip == '>>'; return []
  when acc_phrase =~ /^\s*>>\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*$/
    return ["#{INPUT}.into(#{rb_vars($1)})"]
  else raise("Can't figure out your accumulator statement: #{acc_phrase}")
  end
end

#rb_transition_commands(st, currstate) ⇒ Object 



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# File 'lib/genmachine/generators/ruby/helper.rb', line 57

def rb_transition_commands(st,currstate)
  st = st.strip.split(';').map(&:strip)
  out = []
  add_next = false
  st.each do |s|
    case
    when s =~ /^([^\(\[]+)(?:\[([^\]]*)\])?\(([^\)]*)\)$/   # Call another group
      funname = $1
      rename = $2
      params = $3.split(',').map{|p|rb_vars(p)}
      params << 's'
      params << "'#{rename}'" unless (rename.nil? or rename.strip=='')
      out << "#{STATE}=#{funname}(#{params.join(',')})"
      add_next = true
    when s =~ /^<done>$/
      out << "return(s)"
      add_next = false
    when s =~ /^<([^>]+)>$/
      out << "return(#{rb_vars($1)})"
      add_next = false
    when s =~ /^(:[a-zA-Z0-9_:-]+)$/
      out << "#{STATE}='#{$1}'" unless currstate == $1
      add_next = true
    else
      out << s
    end
  end
  out << 'next' if add_next
  return out
end

#rb_vars(str) ⇒ Object 



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# File 'lib/genmachine/generators/ruby/helper.rb', line 88

def rb_vars(str)
  str.tr('$','@').gsub /(:[a-zA-Z0-9_:-]+)/, '\'\1\''
end