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#!/usr/bin/env ruby -w
# encoding: UTF-8
#
# = MacroTable.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.
#
class TaskJuggler::TextParser
class Macro
attr_reader :name, :value, :sourceFileInfo
def initialize(name, value, sourceFileInfo)
@name = name
@value = value
@sourceFileInfo = sourceFileInfo
end
end
# The MacroTable is used by the TextScanner to store defined macros and
# resolve them on request later on. A macro is a text pattern that has a name.
# The pattern may contain variable parts that are replaced by arguments passed
# during the macro call.
class MacroTable
def initialize
@macros = {}
end
# Add a new macro definition to the table or replace an existing one.
def add(macro)
@macros[macro.name] = macro
end
# Remove all definitions from the table.
def clear
@macros = []
end
# Returns true only if a macro named _name_ is defined in the table.
def include?(name)
@macros.include?(name)
end
# Returns the definition of the macro specified by name as first entry of
# _args_. The other entries of _args_ are parameters that are replacing the
# ${n} tokens in the macro definition. In case the macro call has less
# arguments than the macro definition uses, the ${n} tokens remain
# unchanged. No error is generated.
def resolve(args, sourceFileInfo)
name = args[0]
# If the first character of the macro name is a '?', the macro may be
# undefined and is silently ignored.
if name[0] == ??
# Remove the '?' from the name.
name = name[1..-1]
return [ nil, '' ] unless @macros[name]
end
return nil unless @macros[name]
resolved = @macros[name].value.dup
i = 0
args.each do |arg|
resolved.gsub!(Regexp.new("(([^$]|^))\\$\\{#{i}\\}"), "\\1#{arg}")
i += 1
end
# Remove the escape character from all the escaped '${...}'.
resolved.gsub!('$${', '${')
[ @macros[name], resolved ]
end
end
end
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