Class: TokenLexer

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

Overview

! /bin/env ruby

Author: Alice “Duchess” Archer Copyright © 2016 under the MIT License see COPYING.md for full copyright Name: rFlex Description: lexical analysis library

Instance Method Summary collapse

Constructor Details

#initialize(type, regexp) ⇒ TokenLexer

Returns a new instance of TokenLexer.



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# File 'lib/rflex.rb', line 12

def initialize type, regexp
  @type = type
  @regexp = regexp
  @blockType = nil
  @block = nil
end

Instance Method Details

#analyze(token, regex, type) ⇒ Object 



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# File 'lib/rflex.rb', line 100

def analyze token, regex, type
  @block.call(token, regex, type)
end

#block ⇒ Object 



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# File 'lib/rflex.rb', line 112

def block
  return @block
end

#do(type, &block) ⇒ Object 



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# File 'lib/rflex.rb', line 19

def do type, &block
  @block = block
  @blockType = type
end

#lex(input) ⇒ Object 



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# File 'lib/rflex.rb', line 24

def lex input

  inputT = input
  temp = self.sliceL(inputT)
  token = ""
  if temp == nil
    raise "\n\nUnconsumed Input:\n\n[#{inputT}]\n\n"
  else 
    token = temp[:token]
  end

  if token.length >= 1
    if @block != nil
      analyze(token, @regexp, @type)
    end
    if temp[:inputS].length == 0 # token is not empty and remaining input is empty

      return { :success => true, :inputS => temp[:inputS], :done => true, :error => false }
    else # token is not empty and remaining input is not empty

      return { :success => true, :inputS => temp[:inputS], :done => false, :error => false }
    end
  else
    if temp[:inputS].length >= 1 # token is empty and remaining input is not empty 

      # error

      #raise "\n\nUnconsumed Input:\n\n[#{temp[:inputS]}]\n\n"

      return { :success => false, :inputS => input, :done => false, :error => true }
    else
      # token is empty and input is not

      return { :success => false, :inputS => input, :done => false, :error => false }
    end 
  end
end

#regexp ⇒ Object 



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# File 'lib/rflex.rb', line 108

def regexp
  return @regexp
end

#sliceL(input) ⇒ Object 



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# File 'lib/rflex.rb', line 56

def sliceL input

  # puts "\n\n"


  if input == nil
    return { :token => "", :input => input }
  end

  len = input.length
  ii = 0
  temp = ""
  curMatch = ""
  matched = false
  inputT = input

  until ii == len do

    temp.concat(input[ii])
    # print "[#{input[ii]}]"

    if temp.match(@regexp)
      matched = true
      curMatch = temp
      ii += 1
      if ii == len
        inputT = inputT[(ii)..-1].to_s
        return { :token => curMatch[0..-1], :inputS => inputT }
      end
      next
    else
      ii += 1
      if matched
        inputT = inputT[(ii - 1)..-1].to_s
        return { :token => curMatch[0..-2], :inputS => inputT }
      else
        if ii == len
          return { :token => "", :inputS => inputT }
        else
          next
        end
      end
    end
  end
end

#type ⇒ Object 



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# File 'lib/rflex.rb', line 104

def type
  return @type
end