Module: Kwartz::EperlExpressionParser

Included in:
EperlHandler, EperlTranslator
Defined in:
lib/kwartz/binding/eperl.rb

Instance Method Summary collapse

Instance Method Details

#parse_expr_str(expr_str, linenum) ⇒ Object 



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# File 'lib/kwartz/binding/eperl.rb', line 20

def parse_expr_str(expr_str, linenum)
  case expr_str
  when /\A(\w+)\z/             # variable
    expr = '$'+$1
  when /\A(\w+)\.(\w+)\z/      # object.property
    expr = "$#{$1}->{#{$2}}"
  when /\A(\w+)\[(.*?'|".*?"|:\w+)\]\z/   # hash
    key = $2[0] == ?: ? "'#{$2[1..-1]}'" : $2
    expr = "$#{$1}{#{key}}"
  when /\A(\w+)\[(\w+)\]\z/    # array or hash
    begin
      expr = "$#{$1}[#{Integer($2)}]"
    rescue ArgumentError
      expr = "$#{$1}[$#{$2}]"
    end
  else
    raise convert_error("'#{expr_str}': invalid expression.", linenum)
  end
  return expr
end

#parse_expr_str!(expr_str) ⇒ Object 



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# File 'lib/kwartz/binding/eperl.rb', line 42

def parse_expr_str!(expr_str)
  begin
    return parse_expr_str(expr_str, -1)
  rescue
    return expr_str
  end
end