Class: LanguageParser::SQLT_NormalState

Inherits:
SQLT_State
  • Object
show all
Defined in:
lib/cgialib/lp/SQLTokenizer.rb

Overview

class : SQLT_NormalState

The default state machine to which all of the other states return.

Instance Method Summary collapse

Constructor Details

#initialize(newstate, addtoken) ⇒ SQLT_NormalState

initialize( newstate, addtoken )

newstate - A method to be called to change state addtoken - The method to be called to add a token



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# File 'lib/cgialib/lp/SQLTokenizer.rb', line 254

def initialize( newstate, addtoken )
  
  super( newstate, addtoken )
  
  # This normal state handles adding CodeTokens in the 
  # basic stream (e.g. not in a string). So we have a
  # text buffer.
  
  @text = ""
  
end

Instance Method Details

#next(ch) ⇒ Object

next( ch )

ch - The character

Handles the character in the parsing stream



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# File 'lib/cgialib/lp/SQLTokenizer.rb', line 272

def next( ch )
  
  if ch == "-"
  
    # Start the comment switcher state if we 
    # see a slash
  
    @addtoken.call( CodeToken.new( @text ) )
    @newstate.call( SQLT_Comment )
  
  elsif @@specials[ch]
  
    # If this is a special character (e.g. ;,*,+, etc.)
    # then dump the current token and add the special  
    # characer token
  
    @addtoken.call( CodeToken.new( @text ) )
    @text = ""
  
    @addtoken.call( CodeToken.new( ch ) )
  
  elsif ch == "\'"
  
    # Start the double quote state if we see a
    # double quote
  
    @addtoken.call( CodeToken.new( @text ) )
    @newstate.call( SQLT_DoubleQuote )
  
  elsif ch =~ /\s/

    # Move into the whitespace state if we 
    # see whitespace.  Return true to re-run
    # the parser on this character.
  
    @addtoken.call( CodeToken.new( @text ) )
    @newstate.call( SQLT_WhitespaceTokenizer )
    return false
  
  else
  
    # Otherwise add this character to the buffer
  
    @text += ch
  
  end
  
  # Continue onto the next character
  
  true
  
end