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DOC improve the documentation 

* make API-doc more legible
* improve comments in methods
This commit is contained in:
Patrick Kanzler 2016-01-05 17:30:40 +01:00
parent e5cd37bfbc
commit 8b8ca76af6
12 changed files with 289 additions and 132 deletions
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46
doc/api.rst
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@ -1,46 +0,0 @@
escpos package
==============
Submodules
----------
escpos.constants module
-----------------------
.. automodule:: escpos.constants
:members:
:undoc-members:
:show-inheritance:
escpos.escpos module
--------------------
.. automodule:: escpos.escpos
:members:
:undoc-members:
:show-inheritance:
escpos.exceptions module
------------------------
.. automodule:: escpos.exceptions
:members:
:undoc-members:
:show-inheritance:
escpos.printer module
---------------------
.. automodule:: escpos.printer
:members:
:undoc-members:
:show-inheritance:
Module contents
---------------
.. automodule:: escpos
:members:
:undoc-members:
:show-inheritance:

10
doc/api/constants.rst Normal file
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@ -0,0 +1,10 @@
Constants
---------
Module :py:mod:`escpos.constants`
.. automodule:: escpos.constants
:members:
:inherited-members:
:undoc-members:
:show-inheritance:
:member-order: bysource

10
doc/api/escpos.rst Normal file
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@ -0,0 +1,10 @@
Esc/Pos
-------
Module :py:mod:`escpos.escpos`
.. automodule:: escpos.escpos
:members:
:inherited-members:
:undoc-members:
:show-inheritance:
:member-order: bysource

9
doc/api/exceptions.rst Normal file
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@ -0,0 +1,9 @@
Exceptions
----------
Module :py:mod:`escpos.exceptions`
.. automodule:: escpos.exceptions
:members:
:inherited-members:
:show-inheritance:
:member-order: bysource

10
doc/api/printer.rst Normal file
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@ -0,0 +1,10 @@
Printer implementations
-----------------------
Module :py:mod:`escpos.printer`
.. automodule:: escpos.printer
:members:
:inherited-members:
:undoc-members:
:show-inheritance:
:member-order: bysource

13
doc/index.rst
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@ -25,8 +25,8 @@ sending my PayPal info so you can donate.
Thank you! Thank you!
User Documentation: User Documentation
------------------- ------------------
.. toctree:: .. toctree::
:maxdepth: 1 :maxdepth: 1
@ -39,13 +39,16 @@ User Documentation:
user/todo user/todo
user/usage user/usage
API: API
---- ---
.. toctree:: .. toctree::
:maxdepth: 1 :maxdepth: 1
api api/escpos
api/printer
api/constants
api/exceptions
Indices and tables Indices and tables
================== ==================

3
doc/user/methods.rst
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@ -2,7 +2,8 @@
Methods Methods
******* *******
.. note:: **TODO** Merge this page into the API-description. .. note:: **TODO** Merge this page with the API-description. (Make the API-description more pretty and then
replace this with the API-description.)
Escpos class Escpos class
------------ ------------

3
doc/user/todo.rst
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@ -21,6 +21,7 @@ Testing
~~~~~~~ ~~~~~~~
* Test on many printers as possible (USB, Serial, Network) * Test on many printers as possible (USB, Serial, Network)
* automate testing
Design Design
~~~~~~ ~~~~~~
@ -32,4 +33,6 @@ Design
* Windows compatibility (hidapi instead libusb?) * Windows compatibility (hidapi instead libusb?)
* PDF417 support * PDF417 support
* use something similar to the `capabilities` in escpos-php

12
escpos/constants.py
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@ -1,4 +1,14 @@
""" ESC/POS Commands (Constants) """ """ Set of ESC/POS Commands (Constants)
This module contains constants that are described in the esc/pos-documentation.
Since there is no definitive and unified specification for all esc/pos-like printers the constants could later be
moved to `capabilities` as in `escpos-php by @mike42 <https://github.com/mike42/escpos-php>`_.
:author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
"""
# Feed control sequences # Feed control sequences
CTL_LF = '\x0a' # Print and line feed CTL_LF = '\x0a' # Print and line feed

139
escpos/escpos.py
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@ -1,9 +1,12 @@
#!/usr/bin/python #!/usr/bin/python
""" """ Main class
@author: Manuel F Martinez <manpaz@bashlinux.com>
@organization: Bashlinux This module contains the abstract base class :py:class:`Escpos`.
@copyright: Copyright (c) 2012 Bashlinux
@license: GNU GPL v3 :author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
""" """
try: try:
@ -22,11 +25,14 @@ from .exceptions import *
from abc import ABCMeta, abstractmethod # abstract base class support from abc import ABCMeta, abstractmethod # abstract base class support
class Escpos(object): class Escpos(object):
""" ESC/POS Printer object """ """ ESC/POS Printer object
This class is the abstract base class for an esc/pos-printer. The printer implementations are children of this
class.
"""
__metaclass__ = ABCMeta __metaclass__ = ABCMeta
device = None device = None
def __init__(self, columns=32): def __init__(self, columns=32):
""" Initialize ESCPOS Printer """ Initialize ESCPOS Printer
@ -38,6 +44,7 @@ class Escpos(object):
""" Sends raw data to the printer """ Sends raw data to the printer
This function has to be individually implemented by the implementations. This function has to be individually implemented by the implementations.
:param msg: message string to be sent to the printer :param msg: message string to be sent to the printer
""" """
pass pass
@ -88,7 +95,7 @@ class Escpos(object):
""" Parse image and prepare it to a printable format """ Parse image and prepare it to a printable format
:param im: image data :param im: image data
:raises: ImageSizeError :raises: :py:exc:`~escpos.exceptions.ImageSizeError`
""" """
pixels = [] pixels = []
pix_line = "" pix_line = ""
@ -135,9 +142,11 @@ class Escpos(object):
self._print_image(pix_line, img_size) self._print_image(pix_line, img_size)
def image(self, path_img): def image(self, path_img):
""" Open image file """ Open and print an image file
:param path_img: path to image Prints an image. The image is automatically adjusted in size in order to print it.
:param path_img: complete filename and path to image of type `jpg`, `gif`, `png` or `bmp`
""" """
im_open = Image.open(path_img) im_open = Image.open(path_img)
@ -153,7 +162,10 @@ class Escpos(object):
self._convert_image(im) self._convert_image(im)
def direct_image(self, image): def direct_image(self, image):
""" Send image to printer""" """ Send image to printer
:param image:
"""
mask = 0x80 mask = 0x80
i = 0 i = 0
temp = 0 temp = 0
@ -188,6 +200,9 @@ class Escpos(object):
def qr(self, text): def qr(self, text):
""" Print QR Code for the provided string """ Print QR Code for the provided string
Prints a QR-code. The size has been adjusted to version 4, so it is small enough to be
printed but also big enough to be read by a smartphone.
:param text: text to generate a QR-Code from :param text: text to generate a QR-Code from
""" """
qr_code = qrcode.QRCode(version=4, box_size=4, border=1) qr_code = qrcode.QRCode(version=4, box_size=4, border=1)
@ -202,10 +217,11 @@ class Escpos(object):
def charcode(self, code): def charcode(self, code):
""" Set Character Code Table """ Set Character Code Table
Sends the control sequence from constants.py to the printer with :py:meth:`escpos.printer._raw()`. Sends the control sequence from :py:mod:`escpos.constants` to the printer
with :py:meth:`escpos.printer.'implementation'._raw()`.
:param code: Name of CharCode :param code: Name of CharCode
:raises: CharCodeError :raises: :py:exc:`~escpos.exceptions.CharCodeError`
""" """
if code.upper() == "USA": if code.upper() == "USA":
self._raw(CHARCODE_PC437) self._raw(CHARCODE_PC437)
@ -255,13 +271,37 @@ class Escpos(object):
def barcode(self, code, bc, width, height, pos, font): def barcode(self, code, bc, width, height, pos, font):
""" Print Barcode """ Print Barcode
:param code: data for barcode :param code: alphanumeric data to be printed as bar code
:param bc: barcode format, see constants.py :param bc: barcode format, possible values are:
* UPC-A
* UPC-E
* EAN13
* EAN8
* CODE39
* ITF
* NW7
If none is specified, the method raises :py:exc:`~escpos.exceptions.BarcodeTypeError`.
:param width: barcode width, has to be between 1 and 255 :param width: barcode width, has to be between 1 and 255
*default*: 64
:param height: barcode height, has to be between 2 and 6 :param height: barcode height, has to be between 2 and 6
:param pos: position of text in barcode, default when nothing supplied is below *default*: 3
:param font: select font, default is font A :param pos: where to place the text relative to the barcode, *default*: below
:raises: BarcodeSizeError, BarcodeTypeError, BarcodeCodeError
* ABOVE
* BELOW
* BOTH
* OFF
:param font: select font (see ESC/POS-documentation, the device often has two fonts), *default*: A
* A
* B
:raises: :py:exc:`~escpos.exceptions.BarcodeSizeError`,
:py:exc:`~escpos.exceptions.BarcodeTypeError`,
:py:exc:`~escpos.exceptions.BarcodeCodeError`
""" """
# Align Bar Code() # Align Bar Code()
self._raw(TXT_ALIGN_CT) self._raw(TXT_ALIGN_CT)
@ -316,28 +356,51 @@ class Escpos(object):
""" Print alpha-numeric text """ Print alpha-numeric text
The text has to be encoded in the currently selected codepage. The text has to be encoded in the currently selected codepage.
:param txt: text to be printed :param txt: text to be printed
:raises: TextError :raises: :py:exc:`~escpos.exceptions.TextError`
""" """
if txt: if txt:
self._raw(txt) self._raw(txt)
else: else:
# TODO: why is it problematic to print an empty string?
raise TextError() raise TextError()
def block_text(self, txt, columns=None): def block_text(self, txt, columns=None):
'''Text is printed wrapped to specified columns''' """ Text is printed wrapped to specified columns
:param txt: text to be printed
:param columns: amount of columns
:return: None
"""
colCount = self.columns if columns == None else columns colCount = self.columns if columns == None else columns
self.text(textwrap.fill(txt, colCount)) self.text(textwrap.fill(txt, colCount))
def set(self, align='left', font='a', text_type='normal', width=1, height=1, density=9): def set(self, align='left', font='a', text_type='normal', width=1, height=1, density=9):
""" Set text properties by sending them to the printer """ Set text properties by sending them to the printer
:param align: alignment of text :param align: horizontal position for text, possible values are:
:param font: font A or B
:param text_type: add bold or underlined * CENTER
:param width: text width, normal or double width * LEFT
:param height: text height, normal or double height * RIGHT
:param density: print density
*default*: LEFT
:param font: font type, possible values are A or B, *default*: A
:param text_type: text type, possible values are:
* B for bold
* U for underlined
* B2 for bold, version 2
* U2 for underlined, version 2
* BU for bold and underlined
* BU2 for bold and underlined, version 2
* NORMAL for normal text
*default*: NORMAL
:param width: text width, normal (1) or double width (2), *default*: 1
:param height: text height, normal (1) or double height (2), *default*: 2
:param density: print density, value from 0-8, if something else is supplied the density remains unchanged
""" """
# Width # Width
if height == 2 and width == 2: if height == 2 and width == 2:
@ -420,9 +483,10 @@ class Escpos(object):
def cashdraw(self, pin): def cashdraw(self, pin):
""" Send pulse to kick the cash drawer """ Send pulse to kick the cash drawer
Kick cash drawer on pin 2 or pin 5. Kick cash drawer on pin 2 or pin 5 according to parameter.
:param pin: pin number
:raises: CashDrawerError :param pin: pin number, 2 or 5
:raises: :py:exc:`~escpos.exceptions.CashDrawerError`
""" """
if pin == 2: if pin == 2:
self._raw(CD_KICK_2) self._raw(CD_KICK_2)
@ -434,7 +498,11 @@ class Escpos(object):
def hw(self, hw): def hw(self, hw):
""" Hardware operations """ Hardware operations
:param hw: hardware action :param hw: hardware action, may be:
* INIT
* SELECT
* RESET
""" """
if hw.upper() == "INIT": if hw.upper() == "INIT":
self._raw(HW_INIT) self._raw(HW_INIT)
@ -448,7 +516,16 @@ class Escpos(object):
def control(self, ctl, pos=4): def control(self, ctl, pos=4):
""" Feed control sequences """ Feed control sequences
:raises: TabPosError :param ctl: string for the following control sequences:
* LF *for Line Feed*
* FF *for Form Feed*
* CR *for Carriage Return*
* HT *for Horizontal Tab*
* VT *for Vertical Tab*
:param pos: integer between 1 and 16, controls the horizontal tab position
:raises: :py:exc:`~escpos.exceptions.TabPosError`
""" """
# Set tab positions # Set tab positions
if pos < 1 or pos > 16: if pos < 1 or pos > 16:

82
escpos/exceptions.py
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@ -1,4 +1,22 @@
""" ESC/POS Exceptions classes """ """ ESC/POS Exceptions classes
Result/Exit codes:
- `0` = success
- `10` = No Barcode type defined :py:exc:`~escpos.exceptions.BarcodeTypeError`
- `20` = Barcode size values are out of range :py:exc:`~escpos.exceptions.BarcodeSizeError`
- `30` = Barcode text not supplied :py:exc:`~escpos.exceptions.BarcodeCodeError`
- `40` = Image height is too large :py:exc:`~escpos.exceptions.ImageSizeError`
- `50` = No string supplied to be printed :py:exc:`~escpos.exceptions.TextError`
- `60` = Invalid pin to send Cash Drawer pulse :py:exc:`~escpos.exceptions.CashDrawerError`
- `70` = Invalid number of tab positions :py:exc:`~escpos.exceptions.TabPosError`
- `80` = Invalid char code :py:exc:`~escpos.exceptions.CharCodeError`
:author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
"""
class Error(Exception): class Error(Exception):
@ -13,20 +31,14 @@ class Error(Exception):
def __str__(self): def __str__(self):
return self.msg return self.msg
# Result/Exit codes
# 0 = success
# 10 = No Barcode type defined
# 20 = Barcode size values are out of range
# 30 = Barcode text not supplied
# 40 = Image height is too large
# 50 = No string supplied to be printed
# 60 = Invalid pin to send Cash Drawer pulse
# 70 = Invalid number of tab positions
# 80 = Invalid char code
class BarcodeTypeError(Error): class BarcodeTypeError(Error):
"""No Barcode type defined """ """ No Barcode type defined.
This exception indicates that no known barcode-type has been entered. The barcode-type has to be
one of those specified in :py:meth:`escpos.escpos.Escpos.barcode`.
The returned error code is `10`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
@ -37,7 +49,12 @@ class BarcodeTypeError(Error):
class BarcodeSizeError(Error): class BarcodeSizeError(Error):
""" Barcode size is out of range """ """ Barcode size is out of range.
This exception indicates that the values for the barcode size are out of range.
The size of the barcode has to be in the range that is specified in :py:meth:`escpos.escpos.Escpos.barcode`.
The resulting returncode is `20`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
@ -48,7 +65,11 @@ class BarcodeSizeError(Error):
class BarcodeCodeError(Error): class BarcodeCodeError(Error):
""" No Barcode code was supplied """ """ No Barcode code was supplied.
No data for the barcode has been supplied in :py:meth:`escpos.escpos.Escpos.barcode`.
The returncode for this exception is `30`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
@ -59,7 +80,10 @@ class BarcodeCodeError(Error):
class ImageSizeError(Error): class ImageSizeError(Error):
""" Image height is longer than 255px and can't be printed """ """ Image height is longer than 255px and can't be printed.
The returncode for this exception is `40`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
@ -70,7 +94,11 @@ class ImageSizeError(Error):
class TextError(Error): class TextError(Error):
""" Test sting must be supplied to the text() method """ """ Text string must be supplied to the `text()` method.
This exception is raised when an empty string is passed to :py:meth:`escpos.escpos.Escpos.text`.
The returncode for this exception is `50`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
@ -81,7 +109,11 @@ class TextError(Error):
class CashDrawerError(Error): class CashDrawerError(Error):
""" Valid pin must be set to send pulse """ """ Valid pin must be set in order to send pulse.
A valid pin number has to be passed onto the method :py:meth:`escpos.escpos.Escpos.cashdraw`.
The returncode for this exception is `60`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
@ -92,7 +124,11 @@ class CashDrawerError(Error):
class TabPosError(Error): class TabPosError(Error):
""" Valid tab positions must be in the range 0 to 16 """ """ Valid tab positions must be in the range 0 to 16.
This exception is raised by :py:meth:`escpos.escpos.Escpos.control`.
The returncode for this exception is `70`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
@ -103,11 +139,15 @@ class TabPosError(Error):
class CharCodeError(Error): class CharCodeError(Error):
""" Valid char code must be set """ """ Valid char code must be set.
The supplied charcode-name in :py:meth:`escpos.escpos.Escpos.charcode` is unknown.
Ths returncode for this exception is `80`.
"""
def __init__(self, msg=""): def __init__(self, msg=""):
Error.__init__(self, msg) Error.__init__(self, msg)
self.msg = msg self.msg = msg
self.resultcode = 70 self.resultcode = 80
def __str__(self): def __str__(self):
return "Valid char code must be set" return "Valid char code must be set"

84
escpos/printer.py
View File

@ -1,9 +1,10 @@
#!/usr/bin/python #!/usr/bin/python
""" """ This module contains the implentations of abstract base class :py:class:`Escpos`.
@author: Manuel F Martinez <manpaz@bashlinux.com>
@organization: Bashlinux :author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
@copyright: Copyright (c) 2012 Bashlinux :organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
@license: GNU GPL v3 :copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
""" """
import usb.core import usb.core
@ -17,7 +18,10 @@ from .exceptions import *
class Usb(Escpos): class Usb(Escpos):
""" Define USB printer """ """ USB printer
This class describes a printer that natively speaks USB.
"""
def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01, *args, **kwargs): def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01, *args, **kwargs):
""" """
@ -62,7 +66,10 @@ class Usb(Escpos):
print("Could not set configuration: %s" % str(e)) print("Could not set configuration: %s" % str(e))
def _raw(self, msg): def _raw(self, msg):
""" Print any command sent in raw format """ """ Print any command sent in raw format
:param msg: arbitrary code to be printed
"""
self.device.write(self.out_ep, msg, self.interface) self.device.write(self.out_ep, msg, self.interface)
def __del__(self): def __del__(self):
@ -73,21 +80,24 @@ class Usb(Escpos):
class Serial(Escpos): class Serial(Escpos):
""" Define Serial printer """ """ Serial printer
This class describes a printer that is connected by serial interface.
"""
def __init__(self, devfile="/dev/ttyS0", baudrate=9600, bytesize=8, timeout=1, def __init__(self, devfile="/dev/ttyS0", baudrate=9600, bytesize=8, timeout=1,
parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,
xonxoff=False , dsrdtr=True, *args, **kwargs): xonxoff=False, dsrdtr=True, *args, **kwargs):
""" """
@param devfile : Device file under dev filesystem
@param baudrate : Baud rate for serial transmission
@param bytesize : Serial buffer size
@param timeout : Read/Write timeout
@param parity : Parity checking :param devfile: Device file under dev filesystem
@param stopbits : Number of stop bits :param baudrate: Baud rate for serial transmission
@param xonxoff : Software flow control :param bytesize: Serial buffer size
@param dsrdtr : Hardware flow control (False to enable RTS/CTS) :param timeout: Read/Write timeout
:param parity: Parity checking
:param stopbits: Number of stop bits
:param xonxoff: Software flow control
:param dsrdtr: Hardware flow control (False to enable RTS/CTS)
""" """
Escpos.__init__(self, *args, **kwargs) Escpos.__init__(self, *args, **kwargs)
self.devfile = devfile self.devfile = devfile
@ -114,7 +124,10 @@ class Serial(Escpos):
print("Unable to open serial printer on: %s" % self.devfile) print("Unable to open serial printer on: %s" % self.devfile)
def _raw(self, msg): def _raw(self, msg):
""" Print any command sent in raw format """ """ Print any command sent in raw format
:param msg: arbitrary code to be printed
"""
self.device.write(msg) self.device.write(msg)
def __del__(self): def __del__(self):
@ -124,12 +137,17 @@ class Serial(Escpos):
class Network(Escpos): class Network(Escpos):
""" Define Network printer """ """ Network printer
def __init__(self,host,port=9100, *args, **kwargs): This class is used to attach to a networked printer. You can also use this in order to attach to a printer that
is forwarded with `netcat`.
""" """
@param host : Printer's hostname or IP address
@param port : Port to write to def __init__(self, host, port=9100, *args, **kwargs):
"""
:param host : Printer's hostname or IP address
:param port : Port to write to
""" """
Escpos.__init__(self, *args, **kwargs) Escpos.__init__(self, *args, **kwargs)
self.host = host self.host = host
@ -145,7 +163,10 @@ class Network(Escpos):
print("Could not open socket for %s" % self.host) print("Could not open socket for %s" % self.host)
def _raw(self, msg): def _raw(self, msg):
""" Print any command sent in raw format """ """ Print any command sent in raw format
:param msg: arbitrary code to be printed
"""
self.device.send(msg) self.device.send(msg)
def __del__(self): def __del__(self):
@ -154,11 +175,17 @@ class Network(Escpos):
class File(Escpos): class File(Escpos):
""" Define Generic file printer """ """ Generic file printer
This class is used for parallel port printer or other printers that are directly attached to the filesystem.
Note that you should stay away from using USB-to-Parallel-Adapter since they are unreliable
and produce arbitrary errors.
"""
def __init__(self, devfile="/dev/usb/lp0", *args, **kwargs): def __init__(self, devfile="/dev/usb/lp0", *args, **kwargs):
""" """
@param devfile : Device file under dev filesystem
:param devfile : Device file under dev filesystem
""" """
Escpos.__init__(self, *args, **kwargs) Escpos.__init__(self, *args, **kwargs)
self.devfile = devfile self.devfile = devfile
@ -172,11 +199,14 @@ class File(Escpos):
print("Could not open the specified file %s" % self.devfile) print("Could not open the specified file %s" % self.devfile)
def flush(self): def flush(self):
"""Flush printing content""" """ Flush printing content """
self.device.flush() self.device.flush()
def _raw(self, msg): def _raw(self, msg):
""" Print any command sent in raw format """ """ Print any command sent in raw format
:param msg: arbitrary code to be printed
"""
if type(msg) is str: if type(msg) is str:
self.device.write(msg.encode()); self.device.write(msg.encode());
else: else: