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#!/usr/bin/env ruby -w
# encoding: UTF-8
#
# = LogicalExpression.rb -- The TaskJuggler III Project Management Software
#
# Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
# by Chris Schlaeger <cs@taskjuggler.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
require 'taskjuggler/LogicalOperation'
require 'taskjuggler/Attributes'
require 'taskjuggler/LogicalFunction'
class TaskJuggler
# A LogicalExpression is an object that describes tree of LogicalOperation
# objects and the context that it should be evaluated in.
class LogicalExpression
attr_reader :query, :sourceFileInfo
# Create a new LogicalExpression object. _op_ must be a LogicalOperation.
# _sourceFileInfo_ is the file position where expression started. It may be
# nil if not available.
def initialize(op, sourceFileInfo = nil)
@operation = op
@sourceFileInfo = sourceFileInfo
@query = nil
end
# This function triggers the evaluation of the expression. _property_ is the
# PropertyTreeNode that should be used for the evaluation. _scopeProperty_
# is the PropertyTreeNode that describes the scope. It may be nil.
def eval(query)
@query = query
res = @operation.eval(self)
return res if res.is_a?(TrueClass) || res.is_a?(FalseClass) ||
res.is_a?(String)
# In TJP syntax 'non 0' means false.
return res != 0
end
# Dump the LogicalExpression as a String. If _query_ is provided, it will
# show the actual values, otherwise just the variable names.
def to_s(query = nil)
if @sourceFileInfo.nil?
"#{@operation.to_s(query)}"
else
"#{@sourceFileInfo} #{@operation.to_s(query)}"
end
end
# This is an internal function. It's called by the LogicalOperation methods
# in case something went wrong during an evaluation.
def error(text) # :nodoc:
raise TjException.new, "#{to_s}\nLogical expression error: #{text}"
end
end
end
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