Class: Parser::ParserRule

Inherits:
Object
  • Object
show all
Defined in:
lib/appswarm/tools/parser/parser_lib.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parser, name, elements, params, block) ⇒ ParserRule

Returns a new instance of ParserRule.



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# File 'lib/appswarm/tools/parser/parser_lib.rb', line 46

def initialize(parser,name,elements,params,block)
  @parser=parser
  @name=name
  @elements=[elements].flatten
  
  @params=params
  @block=block
end

Instance Attribute Details

#block ⇒ Object (readonly)

Returns the value of attribute block.



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# File 'lib/appswarm/tools/parser/parser_lib.rb', line 45

def block
  @block
end

Instance Method Details

#parse(ctx) ⇒ Object 



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# File 'lib/appswarm/tools/parser/parser_lib.rb', line 59

def parse(ctx)
  parsed=[]
  @elements.each{|element|
    #puts "TRY #{element.inspect} on '#{ctx.str}'"
    case element
      when Regexp
        regex=element.source
        str=ctx.str
        #pp "R:",regex,element,element.class
        #$KCODE="n"
        regex= Regexp.new("\\A#{regex}",0,'n') ##/^#{regex}/
        #regex=element
        #pp "REGEX:",regex
        match=str.match(regex)
        unless match
         # puts "FAIL at regexp #{element}"
          return nil
        end
        rstr=match[0]

        #pp "str:",str
        #str.each_byte{|b|pp b}
        #pp "RESULT:",match,rstr,regex
        return nil unless rstr
        ctx.pos+=rstr.length
        
        parsed<<ParsedElement.new("Regexp",rstr,nil)
      when Symbol
        value=@parser.parseContext(ctx,element)
        if value.nil?
          #puts "FAIL at symbol"
          return nil
        end
        parsed<<value
      when String
        if ctx.str[0..(element.length-1)]!=element
          #puts ctx.str
          #puts "Fail at string"
          return nil
        end
        
        ctx.pos+=element.length
        parsed<<ParsedElement.new("String",element,nil)
      else
        raise "Unknown Element !!!! #{element}"
    end
  }
  
  return ParsedElement.new(@name,parsed,@block)
end

#to_s ⇒ Object 



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# File 'lib/appswarm/tools/parser/parser_lib.rb', line 55

def to_s
  "#{@name}=>#{@elements}"
end