# coding: utf-8
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# Copyright (c) 2017-2018 European Synchrotron Radiation Facility
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"""This package provides a class sharred by widget from the
data module to format data as text in the same way."""
__authors__ = ["V. Valls"]
__license__ = "MIT"
__date__ = "24/07/2018"
import logging
import numbers
import numpy
import six
from silx.gui import qt
import h5py
_logger = logging.getLogger(__name__)
[docs]class TextFormatter(qt.QObject):
"""Formatter to convert data to string.
The method :meth:`toString` returns a formatted string from an input data
using parameters set to this object.
It support most python and numpy data, expecting dictionary. Unsupported
data are displayed using the string representation of the object (`str`).
It provides a set of parameters to custom the formatting of integer and
float values (:meth:`setIntegerFormat`, :meth:`setFloatFormat`).
It also allows to custom the use of quotes to display text data
(:meth:`setUseQuoteForText`), and custom unit used to display imaginary
numbers (:meth:`setImaginaryUnit`).
The object emit an event `formatChanged` every time a parametter is
changed.
"""
formatChanged = qt.Signal()
"""Emitted when properties of the formatter change."""
def __init__(self, parent=None, formatter=None):
"""
Constructor
:param qt.QObject parent: Owner of the object
:param TextFormatter formatter: Instantiate this object from the
formatter
"""
qt.QObject.__init__(self, parent)
if formatter is not None:
self.__integerFormat = formatter.integerFormat()
self.__floatFormat = formatter.floatFormat()
self.__useQuoteForText = formatter.useQuoteForText()
self.__imaginaryUnit = formatter.imaginaryUnit()
self.__enumFormat = formatter.enumFormat()
else:
self.__integerFormat = "%d"
self.__floatFormat = "%g"
self.__useQuoteForText = True
self.__imaginaryUnit = u"j"
self.__enumFormat = u"%(name)s(%(value)d)"
[docs] def integerFormat(self):
"""Returns the format string controlling how the integer data
are formated by this object.
This is the C-style format string used by python when formatting
strings with the modulus operator.
:rtype: str
"""
return self.__integerFormat
[docs] def setIntegerFormat(self, value):
"""Set format string controlling how the integer data are
formated by this object.
:param str value: Format string (e.g. "%d", "%i", "%08i").
This is the C-style format string used by python when formatting
strings with the modulus operator.
"""
if self.__integerFormat == value:
return
self.__integerFormat = value
self.formatChanged.emit()
[docs] def floatFormat(self):
"""Returns the format string controlling how the floating-point data
are formated by this object.
This is the C-style format string used by python when formatting
strings with the modulus operator.
:rtype: str
"""
return self.__floatFormat
[docs] def setFloatFormat(self, value):
"""Set format string controlling how the floating-point data are
formated by this object.
:param str value: Format string (e.g. "%.3f", "%d", "%-10.2f",
"%10.3e").
This is the C-style format string used by python when formatting
strings with the modulus operator.
"""
if self.__floatFormat == value:
return
self.__floatFormat = value
self.formatChanged.emit()
[docs] def useQuoteForText(self):
"""Returns true if the string data are formatted using double quotes.
Else, no quotes are used.
"""
return self.__integerFormat
[docs] def setUseQuoteForText(self, useQuote):
"""Set the use of quotes to delimit string data.
:param bool useQuote: True to use quotes.
"""
if self.__useQuoteForText == useQuote:
return
self.__useQuoteForText = useQuote
self.formatChanged.emit()
[docs] def imaginaryUnit(self):
"""Returns the unit display for imaginary numbers.
:rtype: str
"""
return self.__imaginaryUnit
[docs] def setImaginaryUnit(self, imaginaryUnit):
"""Set the unit display for imaginary numbers.
:param str imaginaryUnit: Unit displayed after imaginary numbers
"""
if self.__imaginaryUnit == imaginaryUnit:
return
self.__imaginaryUnit = imaginaryUnit
self.formatChanged.emit()
[docs] def setEnumFormat(self, value):
"""Set format string controlling how the enum data are
formated by this object.
:param str value: Format string (e.g. "%(name)s(%(value)d)").
This is the C-style format string used by python when formatting
strings with the modulus operator.
"""
if self.__enumFormat == value:
return
self.__enumFormat = value
self.formatChanged.emit()
[docs] def enumFormat(self):
"""Returns the format string controlling how the enum data
are formated by this object.
This is the C-style format string used by python when formatting
strings with the modulus operator.
:rtype: str
"""
return self.__enumFormat
def __formatText(self, text):
if self.__useQuoteForText:
text = "\"%s\"" % text.replace("\\", "\\\\").replace("\"", "\\\"")
return text
def __formatBinary(self, data):
if isinstance(data, numpy.void):
if six.PY2:
data = [ord(d) for d in data.data]
else:
data = data.item()
if isinstance(data, numpy.ndarray):
# Before numpy 1.15.0 the item API was returning a numpy array
data = data.astype(numpy.uint8)
else:
# Now it is supposed to be a bytes type
pass
elif six.PY2:
data = [ord(d) for d in data]
# In python3 data is already a bytes array
data = ["\\x%02X" % d for d in data]
if self.__useQuoteForText:
return "b\"%s\"" % "".join(data)
else:
return "".join(data)
def __formatSafeAscii(self, data):
if six.PY2:
data = [ord(d) for d in data]
data = [chr(d) if (d > 0x20 and d < 0x7F) else "\\x%02X" % d for d in data]
if self.__useQuoteForText:
data = [c if c != '"' else "\\" + c for c in data]
return "b\"%s\"" % "".join(data)
else:
return "".join(data)
def __formatCharString(self, data):
"""Format text of char.
From the specifications we expect to have ASCII, but we also allow
CP1252 in some ceases as fallback.
If no encoding fits, it will display a readable ASCII chars, with
escaped chars (using the python syntax) for non decoded characters.
:param data: A binary string of char expected in ASCII
:rtype: str
"""
try:
text = "%s" % data.decode("ascii")
return self.__formatText(text)
except UnicodeDecodeError:
# Here we can spam errors, this is definitly a badly
# generated file
_logger.error("Invalid ASCII string %s.", data)
if data == b"\xB0":
_logger.error("Fallback using cp1252 encoding")
return self.__formatText(u"\u00B0")
return self.__formatSafeAscii(data)
def __formatH5pyObject(self, data, dtype):
# That's an HDF5 object
ref = h5py.check_dtype(ref=dtype)
if ref is not None:
if bool(data):
return "REF"
else:
return "NULL_REF"
vlen = h5py.check_dtype(vlen=dtype)
if vlen is not None:
if vlen == six.text_type:
# HDF5 UTF8
return self.__formatText(data)
elif vlen == six.binary_type:
# HDF5 ASCII
return self.__formatCharString(data)
elif isinstance(vlen, numpy.dtype):
return self.toString(data, vlen)
return None
[docs] def toString(self, data, dtype=None):
"""Format a data into a string using formatter options
:param object data: Data to render
:param dtype: enforce a dtype (mostly used to remember the h5py dtype,
special h5py dtypes are not propagated from array to items)
:rtype: str
"""
if isinstance(data, tuple):
text = [self.toString(d) for d in data]
return "(" + " ".join(text) + ")"
elif isinstance(data, list):
text = [self.toString(d) for d in data]
return "[" + " ".join(text) + "]"
elif isinstance(data, (numpy.ndarray)):
if dtype is None:
dtype = data.dtype
if data.shape == ():
# it is a scaler
return self.toString(data[()], dtype)
else:
text = [self.toString(d, dtype) for d in data]
return "[" + " ".join(text) + "]"
if dtype is not None and dtype.kind == 'O':
text = self.__formatH5pyObject(data, dtype)
if text is not None:
return text
elif isinstance(data, numpy.void):
if dtype is None:
dtype = data.dtype
if dtype.fields is not None:
text = []
for index, field in enumerate(dtype.fields.items()):
text.append(field[0] + ":" + self.toString(data[index], field[1][0]))
return "(" + " ".join(text) + ")"
return self.__formatBinary(data)
elif isinstance(data, (numpy.unicode_, six.text_type)):
return self.__formatText(data)
elif isinstance(data, (numpy.string_, six.binary_type)):
if dtype is None and hasattr(data, "dtype"):
dtype = data.dtype
if dtype is not None:
# Maybe a sub item from HDF5
if dtype.kind == 'S':
return self.__formatCharString(data)
elif dtype.kind == 'O':
text = self.__formatH5pyObject(data, dtype)
if text is not None:
return text
try:
# Try ascii/utf-8
text = "%s" % data.decode("utf-8")
return self.__formatText(text)
except UnicodeDecodeError:
pass
return self.__formatBinary(data)
elif isinstance(data, six.string_types):
text = "%s" % data
return self.__formatText(text)
elif isinstance(data, (numpy.integer)):
if dtype is None:
dtype = data.dtype
enumType = h5py.check_dtype(enum=dtype)
if enumType is not None:
for key, value in enumType.items():
if value == data:
result = {}
result["name"] = key
result["value"] = data
return self.__enumFormat % result
return self.__integerFormat % data
elif isinstance(data, (numbers.Integral)):
return self.__integerFormat % data
elif isinstance(data, (numbers.Real, numpy.floating)):
# It have to be done before complex checking
return self.__floatFormat % data
elif isinstance(data, (numpy.complexfloating, numbers.Complex)):
text = ""
if data.real != 0:
text += self.__floatFormat % data.real
if data.real != 0 and data.imag != 0:
if data.imag < 0:
template = self.__floatFormat + " - " + self.__floatFormat + self.__imaginaryUnit
params = (data.real, -data.imag)
else:
template = self.__floatFormat + " + " + self.__floatFormat + self.__imaginaryUnit
params = (data.real, data.imag)
else:
if data.imag != 0:
template = self.__floatFormat + self.__imaginaryUnit
params = (data.imag)
else:
template = self.__floatFormat
params = (data.real)
return template % params
elif isinstance(data, h5py.h5r.Reference):
dtype = h5py.special_dtype(ref=h5py.Reference)
text = self.__formatH5pyObject(data, dtype)
return text
elif isinstance(data, h5py.h5r.RegionReference):
dtype = h5py.special_dtype(ref=h5py.RegionReference)
text = self.__formatH5pyObject(data, dtype)
return text
elif isinstance(data, numpy.object_) or dtype is not None:
if dtype is None:
dtype = data.dtype
text = self.__formatH5pyObject(data, dtype)
if text is not None:
return text
# That's a numpy object
return str(data)
return str(data)
