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+-- Welcome to the 'barracuda' barcode library
+--
+-- Encode a message into a barcode symbol, in Lua or within a LuaTeX source file
+--
+-- Copyright (C) 2019 Roberto Giacomelli
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program; if not, write to the Free Software
+-- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+-- Basic Conventions:
+-- fields that start with an undercore are private
+-- class name follows the snake case naming convention
+-- the 'barracuda' table is the only global object to access every package
+-- modules.
+
+local Barracuda = {
+ _VERSION = "barracuda v0.0.9.1",
+ _NAME = "barracuda",
+ _DESCRIPTION = "Lua library for barcode printing",
+ _URL = "https://github.com/robitex/barracuda",
+ _LICENSE = "GNU GENERAL PUBLIC LICENSE, Version 2, June 1991",
+}
+
+-- essential sub-module loading
+Barracuda._libgeo = require "lib-geo.brcd-libgeo" -- basic vectorial objects
+Barracuda._gacanvas = require "lib-geo.brcd-gacanvas" -- ga stream library
+Barracuda._barcode = require "lib-barcode.brcd-barcode" -- barcode abstract class
+
+local Barcode = Barracuda._barcode
+Barcode._libgeo = Barracuda._libgeo
+
+-- encoder builder
+function Barracuda:get_barcode_class() --> Barcode class object
+ return self._barcode
+end
+
+-- where we place output driver library
+function Barracuda:get_driver() --> Driver object, err
+ if not self._lib_driver then
+ self._lib_driver = require "lib-driver.brcd-driver"
+ end
+ return self._lib_driver
+end
+
+function Barracuda:new_canvas() --> driver
+ local gacanvas = self._gacanvas
+ return gacanvas:new()
+end
+
+-- high level barcode functions
+-- only default options
+-- panic on error
+
+-- save barcode as a graphic external file
+function Barracuda:save(bc_type, data, filename, id_drv)
+ local barcode = self:get_barcode_class()
+ local enc, err = barcode:new_encoder(bc_type)
+ assert(enc, err)
+ local arg_data = type(data)
+ local symb
+ if arg_data == "number" then
+ local err_data
+ symb, err_data = enc:from_uint(data)
+ asser(symb, err_data)
+ elseif arg_data == "string" then
+ local err_data
+ symb, err_data = enc:from_string(data)
+ assert(symb, err_data)
+ else
+ error("[argErr] unsupported 'data' type")
+ end
+ local canvas = self:new_canvas()
+ symb:append_ga(canvas)
+ local driver = self:get_driver()
+ id_drv = id_drv or "svg"
+ local ok, out_err = driver:save(id_drv, canvas, filename)
+ assert(ok, out_err)
+end
+
+-- this is a only LuaTeX method
+function Barracuda:hbox(bc_type, data, box_name)
+ local barcode = self:get_barcode_class()
+ local enc, err = barcode:new_encoder(bc_type)
+ assert(enc, err)
+ local arg_data = type(data)
+ local symb
+ if arg_data == "number" then
+ local err_data
+ symb, err_data = enc:from_uint(data)
+ asser(symb, err_data)
+ elseif arg_data == "string" then
+ local err_data
+ symb, err_data = enc:from_string(data)
+ assert(symb, err_data)
+ else
+ error("[argErr] unsupported 'data' type")
+ end
+ local canvas = self:new_canvas()
+ symb:append_ga(canvas)
+ local driver = self:get_driver()
+ local ok, err_hbox = driver:ga_to_hbox(canvas, box_name)
+ assert(ok, err_hbox)
+end
+
+return Barracuda