Class: TokenStream

Inherits:
Array
  • Object
show all
Defined in:
lib/tsql_shparser/tsql_stmt.rb

Overview

A facade class which adds helper methods to the Array class and converts it into a TokenStream

Constant Summary collapse

VERSION = 
"0.0.1"

Instance Method Summary collapse

Constructor Details

#initialize(arr = []) ⇒ TokenStream

Returns a new instance of TokenStream.



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# File 'lib/tsql_shparser/tsql_stmt.rb', line 20

def initialize(arr=[])
  @arr = super(arr)
end

Instance Method Details

#+(arr) ⇒ Object 



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# File 'lib/tsql_shparser/tsql_stmt.rb', line 24

def +(arr);       TokenStream.new(super);  end

#-(arr) ⇒ Object 



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# File 'lib/tsql_shparser/tsql_stmt.rb', line 25

def -(arr);       TokenStream.new(super);  end

#find_matching_paran(from) ⇒ Object 



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# File 'lib/tsql_shparser/tsql_stmt.rb', line 32

def find_matching_paran(from)
    
    list = self.slice(from..-1).to_arr

    m = level = 0
    if (list[0] == LEFT_PARAN)
        list.each_index { |i|
            level += 1 if (list[i] == LEFT_PARAN)
            level -= 1 if (list[i] == RIGHT_PARAN)
            (m = i; break) if (level == 0)
        } 
    end
    
    return m
end

#find_matching_word(words, from = 0) ⇒ Object 



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# File 'lib/tsql_shparser/tsql_stmt.rb', line 48

def find_matching_word(words,from=0)
  list = self.slice(from..-1).to_arr
  pos = 0 # assume that the word will NEVER be the first word in the list
  words.each{|word|
    m = level = 0
    list.each_index { |i|    
        level += 1 if list[i] == LEFT_PARAN
        level -= 1 if list[i] == RIGHT_PARAN
        (m = i; break) if ((list[i] == word) and (level == 0))  
        p [i,level,m] if $DEBUG
    }
    (pos = m; break) if m > 0
  }
  pos
end

#slice(range) ⇒ Object 



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# File 'lib/tsql_shparser/tsql_stmt.rb', line 26

def slice(range); TokenStream.new(super);  end

#to_arr ⇒ Object 



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# File 'lib/tsql_shparser/tsql_stmt.rb', line 28

def to_arr
  (@arr ? @arr.collect{|t| t.token_value} : @arr)
end