# Licensed under a 3-clause BSD style license - see LICENSE.rst

import os

import sys

import re

import numpy as np

from .. import log

from ..utils.console import Getch, color_print, terminal_size, conf

from ..utils.data_info import dtype_info_name

__all__ = []

def default_format_func(format_, val):

if isinstance(val, bytes):

return val.decode('utf-8', errors='replace')

else:

return str(val)

# The first three functions are helpers for _auto_format_func

def _use_str_for_masked_values(format_func):

"""Wrap format function to trap masked values.

String format functions and most user functions will not be able to deal

with masked values, so we wrap them to ensure they are passed to str().

"""

return lambda format_, val: (str(val) if val is np.ma.masked

else format_func(format_, val))

def _possible_string_format_functions(format_):

"""Iterate through possible string-derived format functions.

A string can either be a format specifier for the format built-in,

a new-style format string, or an old-style format string.

"""

yield lambda format_, val: format(val, format_)

yield lambda format_, val: format_.format(val)

yield lambda format_, val: format_ % val

def get_auto_format_func(

col=None,

possible_string_format_functions=_possible_string_format_functions):

"""

Return a wrapped ``auto_format_func`` function which is used in

formatting table columns. This is primarily an internal function but

gets used directly in other parts of astropy, e.g. `astropy.io.ascii`.

Parameters

----------

col_name : object, optional

Hashable object to identify column like id or name. Default is None.

possible_string_format_functions : func, optional

Function that yields possible string formatting functions

(defaults to internal function to do this).

Returns

-------

Wrapped ``auto_format_func`` function

"""

def _auto_format_func(format_, val):

"""Format ``val`` according to ``format_`` for a plain format specifier,

old- or new-style format strings, or using a user supplied function.

More importantly, determine and cache (in _format_funcs) a function

that will do this subsequently. In this way this complicated logic is

only done for the first value.

Returns the formatted value.

"""

if format_ is None:

return default_format_func(format_, val)

if format_ in col.info._format_funcs:

return col.info._format_funcs[format_](format_, val)

if callable(format_):

format_func = lambda format_, val: format_(val)

try:

out = format_func(format_, val)

if not isinstance(out, str):

raise ValueError('Format function for value {0} returned {1} '

'instead of string type'

.format(val, type(val)))

except Exception as err:

# For a masked element, the format function call likely failed

# to handle it. Just return the string representation for now,

# and retry when a non-masked value comes along.

if val is np.ma.masked:

return str(val)

raise ValueError('Format function for value {0} failed: {1}'

.format(val, err))

# If the user-supplied function handles formatting masked elements, use

# it directly. Otherwise, wrap it in a function that traps them.

try:

format_func(format_, np.ma.masked)

except Exception:

format_func = _use_str_for_masked_values(format_func)

else:

# For a masked element, we cannot set string-based format functions yet,

# as all tests below will fail. Just return the string representation

# of masked for now, and retry when a non-masked value comes along.

if val is np.ma.masked:

return str(val)

for format_func in possible_string_format_functions(format_):

try:

# Does this string format method work?

out = format_func(format_, val)

# Require that the format statement actually did something.

if out == format_:

raise ValueError('the format passed in did nothing.')

except Exception:

continue

else:

break

else:

# None of the possible string functions passed muster.

raise ValueError('unable to parse format string {0} for its '

'column.'.format(format_))

# String-based format functions will fail on masked elements;

# wrap them in a function that traps them.

format_func = _use_str_for_masked_values(format_func)

col.info._format_funcs[format_] = format_func

return out

return _auto_format_func

class TableFormatter:

@staticmethod

def _get_pprint_size(max_lines=None, max_width=None):

"""Get the output size (number of lines and character width) for Column and

Table pformat/pprint methods.

If no value of ``max_lines`` is supplied then the height of the

screen terminal is used to set ``max_lines``. If the terminal

height cannot be determined then the default will be determined

using the ``astropy.table.conf.max_lines`` configuration item. If a

negative value of ``max_lines`` is supplied then there is no line

limit applied.

The same applies for max_width except the configuration item is

``astropy.table.conf.max_width``.

Parameters

----------

max_lines : int or None

Maximum lines of output (header + data rows)

max_width : int or None

Maximum width (characters) output

Returns

-------

max_lines, max_width : int

"""

if max_lines is None:

max_lines = conf.max_lines

if max_width is None:

max_width = conf.max_width

if max_lines is None or max_width is None:

lines, width = terminal_size()

if max_lines is None:

max_lines = lines

elif max_lines < 0:

max_lines = sys.maxsize

if max_lines < 8:

max_lines = 8

if max_width is None:

max_width = width

elif max_width < 0:

max_width = sys.maxsize

if max_width < 10:

max_width = 10

return max_lines, max_width

def _pformat_col(self, col, max_lines=None, show_name=True, show_unit=None,

show_dtype=False, show_length=None, html=False, align=None):

"""Return a list of formatted string representation of column values.

Parameters

----------

max_lines : int

Maximum lines of output (header + data rows)

show_name : bool

Include column name. Default is True.

show_unit : bool

Include a header row for unit. Default is to show a row

for units only if one or more columns has a defined value

for the unit.

show_dtype : bool

Include column dtype. Default is False.

show_length : bool

Include column length at end. Default is to show this only

if the column is not shown completely.

html : bool

Output column as HTML

align : str

Left/right alignment of columns. Default is '>' (right) for all

columns. Other allowed values are '<', '^', and '0=' for left,

centered, and 0-padded, respectively.

Returns

-------

lines : list

List of lines with formatted column values

outs : dict

Dict which is used to pass back additional values

defined within the iterator.

"""

if show_unit is None:

show_unit = col.info.unit is not None

outs = {} # Some values from _pformat_col_iter iterator that are needed here

col_strs_iter = self._pformat_col_iter(col, max_lines, show_name=show_name,

show_unit=show_unit,

show_dtype=show_dtype,

show_length=show_length,

outs=outs)

col_strs = list(col_strs_iter)

if len(col_strs) > 0:

col_width = max(len(x) for x in col_strs)

if html:

from ..utils.xml.writer import xml_escape

n_header = outs['n_header']

for i, col_str in enumerate(col_strs):

# _pformat_col output has a header line '----' which is not needed here

if i == n_header - 1:

continue

td = 'th' if i < n_header else 'td'

val = '<{0}>{1}</{2}>'.format(td, xml_escape(col_str.strip()), td)

row = ('<tr>' + val + '</tr>')

if i < n_header:

row = ('<thead>' + row + '</thead>')

col_strs[i] = row

if n_header > 0:

# Get rid of '---' header line

col_strs.pop(n_header - 1)

col_strs.insert(0, '<table>')

col_strs.append('</table>')

# Now bring all the column string values to the same fixed width

else:

col_width = max(len(x) for x in col_strs) if col_strs else 1

# Center line header content and generate dashed headerline

for i in outs['i_centers']:

col_strs[i] = col_strs[i].center(col_width)

if outs['i_dashes'] is not None:

col_strs[outs['i_dashes']] = '-' * col_width

# Format columns according to alignment. `align` arg has precedent, otherwise

# use `col.format` if it starts as a legal alignment string. If neither applies

# then right justify.

re_fill_align = re.compile(r'(?P<fill>.?)(?P<align>[<^>=])')

match = None

if align:

# If there is an align specified then it must match

match = re_fill_align.match(align)

if not match:

raise ValueError("column align must be one of '<', '^', '>', or '='")

elif isinstance(col.info.format, str):

# col.info.format need not match, in which case rjust gets used

match = re_fill_align.match(col.info.format)

if match:

fill_char = match.group('fill')

align_char = match.group('align')

if align_char == '=':

if fill_char != '0':

raise ValueError("fill character must be '0' for '=' align")

fill_char = '' # str.zfill gets used which does not take fill char arg

else:

fill_char = ''

align_char = '>'

justify_methods = {'<': 'ljust', '^': 'center', '>': 'rjust', '=': 'zfill'}

justify_method = justify_methods[align_char]

justify_args = (col_width, fill_char) if fill_char else (col_width,)

for i, col_str in enumerate(col_strs):

col_strs[i] = getattr(col_str, justify_method)(*justify_args)

if outs['show_length']:

col_strs.append('Length = {0} rows'.format(len(col)))

return col_strs, outs

def _pformat_col_iter(self, col, max_lines, show_name, show_unit, outs,

show_dtype=False, show_length=None):

"""Iterator which yields formatted string representation of column values.

Parameters

----------

max_lines : int

Maximum lines of output (header + data rows)

show_name : bool

Include column name. Default is True.

show_unit : bool

Include a header row for unit. Default is to show a row

for units only if one or more columns has a defined value

for the unit.

outs : dict

Must be a dict which is used to pass back additional values

defined within the iterator.

show_dtype : bool

Include column dtype. Default is False.

show_length : bool

Include column length at end. Default is to show this only

if the column is not shown completely.

"""

max_lines, _ = self._get_pprint_size(max_lines, -1)

multidims = getattr(col, 'shape', [0])[1:]

if multidims:

multidim0 = tuple(0 for n in multidims)

multidim1 = tuple(n - 1 for n in multidims)

trivial_multidims = np.prod(multidims) == 1

i_dashes = None

i_centers = [] # Line indexes where content should be centered

n_header = 0

if show_name:

i_centers.append(n_header)

# Get column name (or 'None' if not set)

col_name = str(col.info.name)

if multidims:

col_name += ' [{0}]'.format(

','.join(str(n) for n in multidims))

n_header += 1

yield col_name

if show_unit:

i_centers.append(n_header)

n_header += 1

yield str(col.info.unit or '')

if show_dtype:

i_centers.append(n_header)

n_header += 1

try:

dtype = dtype_info_name(col.dtype)

except AttributeError:

dtype = 'object'

yield str(dtype)

if show_unit or show_name or show_dtype:

i_dashes = n_header

n_header += 1

yield '---'

max_lines -= n_header

n_print2 = max_lines // 2

n_rows = len(col)

# This block of code is responsible for producing the function that

# will format values for this column. The ``format_func`` function

# takes two args (col_format, val) and returns the string-formatted

# version. Some points to understand:

#

# - col_format could itself be the formatting function, so it will

# actually end up being called with itself as the first arg. In

# this case the function is expected to ignore its first arg.

#

# - auto_format_func is a function that gets called on the first

# column value that is being formatted. It then determines an

# appropriate formatting function given the actual value to be

# formatted. This might be deterministic or it might involve

# try/except. The latter allows for different string formatting

# options like %f or {:5.3f}. When auto_format_func is called it:

# 1. Caches the function in the _format_funcs dict so for subsequent

# values the right function is called right away.

# 2. Returns the formatted value.

#

# - possible_string_format_functions is a function that yields a

# succession of functions that might successfully format the

# value. There is a default, but Mixin methods can override this.

# See Quantity for an example.

#

# - get_auto_format_func() returns a wrapped version of auto_format_func

# with the column id and possible_string_format_functions as

# enclosed variables.

col_format = col.info.format or getattr(col.info, 'default_format',

None)

pssf = (getattr(col.info, 'possible_string_format_functions', None) or

_possible_string_format_functions)

auto_format_func = get_auto_format_func(col, pssf)

format_func = col.info._format_funcs.get(col_format, auto_format_func)

if len(col) > max_lines:

if show_length is None:

show_length = True

i0 = n_print2 - (1 if show_length else 0)

i1 = n_rows - n_print2 - max_lines % 2

indices = np.concatenate([np.arange(0, i0 + 1),

np.arange(i1 + 1, len(col))])

else:

i0 = -1

indices = np.arange(len(col))

def format_col_str(idx):

if multidims:

# Prevents columns like Column(data=[[(1,)],[(2,)]], name='a')

# with shape (n,1,...,1) from being printed as if there was

# more than one element in a row

if trivial_multidims:

return format_func(col_format, col[(idx,) + multidim0])

else:

left = format_func(col_format, col[(idx,) + multidim0])

right = format_func(col_format, col[(idx,) + multidim1])

return '{0} .. {1}'.format(left, right)

else:

return format_func(col_format, col[idx])

# Add formatted values if within bounds allowed by max_lines

for idx in indices:

if idx == i0:

yield '...'

else:

try:

yield format_col_str(idx)

except ValueError:

raise ValueError(

'Unable to parse format string "{0}" for entry "{1}" '

'in column "{2}"'.format(col_format, col[idx],

col.info.name))

outs['show_length'] = show_length

outs['n_header'] = n_header

outs['i_centers'] = i_centers

outs['i_dashes'] = i_dashes

def _pformat_table(self, table, max_lines=None, max_width=None,

show_name=True, show_unit=None, show_dtype=False,

html=False, tableid=None, tableclass=None, align=None):

"""Return a list of lines for the formatted string representation of

the table.

Parameters

----------

max_lines : int or None

Maximum number of rows to output

max_width : int or None

Maximum character width of output

show_name : bool

Include a header row for column names. Default is True.

show_unit : bool

Include a header row for unit. Default is to show a row

for units only if one or more columns has a defined value

for the unit.

show_dtype : bool

Include a header row for column dtypes. Default is False.

html : bool

Format the output as an HTML table. Default is False.

tableid : str or None

An ID tag for the table; only used if html is set. Default is

"table{id}", where id is the unique integer id of the table object,

id(table)

tableclass : str or list of str or `None`

CSS classes for the table; only used if html is set. Default is

none

align : str or list or tuple

Left/right alignment of columns. Default is '>' (right) for all

columns. Other allowed values are '<', '^', and '0=' for left,

centered, and 0-padded, respectively. A list of strings can be

provided for alignment of tables with multiple columns.

Returns

-------

rows : list

Formatted table as a list of strings

outs : dict

Dict which is used to pass back additional values

defined within the iterator.

"""

# "Print" all the values into temporary lists by column for subsequent

# use and to determine the width

max_lines, max_width = self._get_pprint_size(max_lines, max_width)

cols = []

if show_unit is None:

show_unit = any(col.info.unit for col in table.columns.values())

# Coerce align into a correctly-sized list of alignments (if possible)

n_cols = len(table.columns)

if align is None or isinstance(align, str):

align = [align] * n_cols

elif isinstance(align, (list, tuple)):

if len(align) != n_cols:

raise ValueError('got {0} alignment values instead of '

'the number of columns ({1})'

.format(len(align), n_cols))

else:

raise TypeError('align keyword must be str or list or tuple (got {0})'

.format(type(align)))

for align_, col in zip(align, table.columns.values()):

lines, outs = self._pformat_col(col, max_lines, show_name=show_name,

show_unit=show_unit, show_dtype=show_dtype,

align=align_)

if outs['show_length']:

lines = lines[:-1]

cols.append(lines)

if not cols:

return ['<No columns>'], {'show_length': False}

# Use the values for the last column since they are all the same

n_header = outs['n_header']

n_rows = len(cols[0])

outwidth = lambda cols: sum(len(c[0]) for c in cols) + len(cols) - 1

dots_col = ['...'] * n_rows

middle = len(cols) // 2

while outwidth(cols) > max_width:

if len(cols) == 1:

break

if len(cols) == 2:

cols[1] = dots_col

break

if cols[middle] is dots_col:

cols.pop(middle)

middle = len(cols) // 2

cols[middle] = dots_col

# Now "print" the (already-stringified) column values into a

# row-oriented list.

rows = []

if html:

from ..utils.xml.writer import xml_escape

if tableid is None:

tableid = 'table{id}'.format(id=id(table))

if tableclass is not None:

if isinstance(tableclass, list):

tableclass = ' '.join(tableclass)

rows.append('<table id="{tid}" class="{tcls}">'.format(

tid=tableid, tcls=tableclass))

else:

rows.append('<table id="{tid}">'.format(tid=tableid))

for i in range(n_rows):

# _pformat_col output has a header line '----' which is not needed here

if i == n_header - 1:

continue

td = 'th' if i < n_header else 'td'

vals = ('<{0}>{1}</{2}>'.format(td, xml_escape(col[i].strip()), td)

for col in cols)

row = ('<tr>' + ''.join(vals) + '</tr>')

if i < n_header:

row = ('<thead>' + row + '</thead>')

rows.append(row)

rows.append('</table>')

else:

for i in range(n_rows):

row = ' '.join(col[i] for col in cols)

rows.append(row)

return rows, outs

def _more_tabcol(self, tabcol, max_lines=None, max_width=None,

show_name=True, show_unit=None, show_dtype=False):

"""Interactive "more" of a table or column.

Parameters

----------

max_lines : int or None

Maximum number of rows to output

max_width : int or None

Maximum character width of output

show_name : bool

Include a header row for column names. Default is True.

show_unit : bool

Include a header row for unit. Default is to show a row

for units only if one or more columns has a defined value

for the unit.

show_dtype : bool

Include a header row for column dtypes. Default is False.

"""

allowed_keys = 'f br<>qhpn'

# Count the header lines

n_header = 0

if show_name:

n_header += 1

if show_unit:

n_header += 1

if show_dtype:

n_header += 1

if show_name or show_unit or show_dtype:

n_header += 1

# Set up kwargs for pformat call. Only Table gets max_width.

kwargs = dict(max_lines=-1, show_name=show_name, show_unit=show_unit,

show_dtype=show_dtype)

if hasattr(tabcol, 'columns'): # tabcol is a table

kwargs['max_width'] = max_width

# If max_lines is None (=> query screen size) then increase by 2.

# This is because get_pprint_size leaves 6 extra lines so that in

# ipython you normally see the last input line.

max_lines1, max_width = self._get_pprint_size(max_lines, max_width)

if max_lines is None:

max_lines1 += 2

delta_lines = max_lines1 - n_header

# Set up a function to get a single character on any platform

inkey = Getch()

i0 = 0 # First table/column row to show

showlines = True

while True:

i1 = i0 + delta_lines # Last table/col row to show

if showlines: # Don't always show the table (e.g. after help)

try:

os.system('cls' if os.name == 'nt' else 'clear')

except Exception:

pass # No worries if clear screen call fails

lines = tabcol[i0:i1].pformat(**kwargs)

colors = ('red' if i < n_header else 'default'

for i in range(len(lines)))

for color, line in zip(colors, lines):

color_print(line, color)

showlines = True

print()

print("-- f, <space>, b, r, p, n, <, >, q h (help) --", end=' ')

# Get a valid key

while True:

try:

key = inkey().lower()

except Exception:

print("\n")

log.error('Console does not support getting a character'

' as required by more(). Use pprint() instead.')

return

if key in allowed_keys:

break

print(key)

if key.lower() == 'q':

break

elif key == ' ' or key == 'f':

i0 += delta_lines

elif key == 'b':

i0 = i0 - delta_lines

elif key == 'r':

pass

elif key == '<':

i0 = 0

elif key == '>':

i0 = len(tabcol)

elif key == 'p':

i0 -= 1

elif key == 'n':

i0 += 1

elif key == 'h':

showlines = False

print("""

Browsing keys:

f, <space> : forward one page

b : back one page

r : refresh same page

n : next row

p : previous row

< : go to beginning

> : go to end

q : quit browsing

h : print this help""", end=' ')

if i0 < 0:

i0 = 0

if i0 >= len(tabcol) - delta_lines:

i0 = len(tabcol) - delta_lines

print("\n")