Class: Glaemscribe::API::RuleGroup

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

Constant Summary collapse

VAR_NAME_REGEXP = 
/{([0-9A-Z_]+)}/
VAR_DECL_REGEXP = 
/^\s*{([0-9A-Z_]+)}\s+===\s+(.+?)\s*$/
RULE_REGEXP = 
/^\s*(.*?)\s+-->\s+(.+?)\s*$/
CROSS_RULE_REGEXP = 
/^\s*(.*?)\s+-->\s+([\s0-9,]+)\s+-->\s+(.+?)\s*$/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(mode, name) ⇒ RuleGroup

Returns a new instance of RuleGroup.



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# File 'lib/api/rule_group.rb', line 34

def initialize(mode,name)
  @name             = name
  @mode             = mode
  @root_code_block  = IfTree::CodeBlock.new       
end

Instance Attribute Details

#in_charset ⇒ Object (readonly)

Returns the value of attribute in_charset.



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# File 'lib/api/rule_group.rb', line 32

def in_charset
  @in_charset
end

#mode ⇒ Object (readonly)

Returns the value of attribute mode.



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# File 'lib/api/rule_group.rb', line 32

def mode
  @mode
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/api/rule_group.rb', line 32

def name
  @name
end

#root_code_block ⇒ Object (readonly)

Returns the value of attribute root_code_block.



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# File 'lib/api/rule_group.rb', line 32

def root_code_block
  @root_code_block
end

#rules ⇒ Object (readonly)

Returns the value of attribute rules.



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# File 'lib/api/rule_group.rb', line 32

def rules
  @rules
end

Instance Method Details

#add_var(var_name, value) ⇒ Object 



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# File 'lib/api/rule_group.rb', line 40

def add_var(var_name, value)
  @vars[var_name] = value
end

#apply_vars(line, string) ⇒ Object

Replace all vars in expression



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# File 'lib/api/rule_group.rb', line 45

def apply_vars(line, string)
  ret = string.gsub(VAR_NAME_REGEXP) { |cap_var|
    rep = @vars[$1]
    if !rep
      @mode.errors << Glaeml::Error.new(line, "In expression: #{string}: failed to evaluate variable: #{cap_var}.") 
      return nil
    end
    rep
  }
  ret
end

#descend_if_tree(code_block, trans_options) ⇒ Object 



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# File 'lib/api/rule_group.rb', line 57

def descend_if_tree(code_block, trans_options)
  code_block.terms.each{ |term|         
    if(term.is_code_lines?)
      term.code_lines.each{ |cl|
        finalize_code_line(cl) 
      } 
    else
      term.if_conds.each{ |if_cond|
        
        if_eval = Eval::Parser.new()
        
        begin
          if(if_eval.parse(if_cond.expression,trans_options) == true)
            descend_if_tree(if_cond.child_code_block, trans_options)
            break
          end
        rescue IfEvalError => e
          @mode.errors << Glaeml::Error.new(if_cond.line, "Failed to evaluate condition '#{if_cond.expression}' (#{e})")
        end 
          
      }
    end
  }
end

#finalize(trans_options) ⇒ Object 



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# File 'lib/api/rule_group.rb', line 137

def finalize(trans_options)
  @vars             = {}       
  @in_charset       = {}
  @rules            = []
  
  add_var("NULL","")
  
  descend_if_tree(@root_code_block, trans_options)
                      
  # Now that we have selected our rules, create the in_charset of the rule_group 
  rules.each{ |r| 
    r.sub_rules.each { |sr|
      sr.src_combination.join("").split(//).each{ |inchar|
        # Add the character to the map of input characters
        # Ignore '_' (bounds of word) and '|' (word breaker)
        @in_charset[inchar] = self if inchar != WORD_BREAKER && inchar != WORD_BOUNDARY
      }
    }
  }
end

#finalize_code_line(code_line) ⇒ Object 



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# File 'lib/api/rule_group.rb', line 98

def finalize_code_line(code_line)
  begin
    
    if code_line.expression =~ VAR_DECL_REGEXP

      var_name      = $1
      var_value_ex  = $2
      var_value     = apply_vars(code_line.line, var_value_ex)
  
      if !var_value
        @mode.errors << Glaeml::Error.new(code_line.line, "Thus, variable {#{var_name}} could not be declared.")
        return
      end
  
      add_var(var_name,var_value)
 
    elsif code_line.expression =~ CROSS_RULE_REGEXP
  
      match         = $1
      cross         = $2
      replacement   = $3      

      finalize_rule(code_line.line, match, replacement, cross)

    elsif code_line.expression =~ RULE_REGEXP
  
      match         = $1
      replacement   = $2

      finalize_rule(code_line.line, match, replacement)
   
    elsif code_line.expression.empty?
      # puts "Empty"
    else
      @mode.errors << Glaeml::Error.new(code_line.line,"Cannot understand: #{code_line.expression}")
    end  
  end
end

#finalize_rule(line, match_exp, replacement_exp, cross_schema = nil) ⇒ Object 



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# File 'lib/api/rule_group.rb', line 82

def finalize_rule(line, match_exp, replacement_exp, cross_schema = nil)
  
  match                 = apply_vars(line, match_exp)
  replacement           = apply_vars(line, replacement_exp)
  
  return if !match || !replacement # Failed
        
  rule                  = Rule.new(line, self)                             
  rule.src_sheaf_chain  = SheafChain.new(rule,match,true)
  rule.dst_sheaf_chain  = SheafChain.new(rule,replacement,false)
        
  rule.finalize(cross_schema)

  self.rules << rule
end