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"""
Module for formatting output data in console (to string).
"""
from __future__ import annotations
from shutil import get_terminal_size
from typing import TYPE_CHECKING
import numpy as np
from pandas.io.formats.printing import pprint_thing
if TYPE_CHECKING:
from collections.abc import Iterable
from pandas.io.formats.format import DataFrameFormatter
class StringFormatter:
"""Formatter for string representation of a dataframe."""
def __init__(self, fmt: DataFrameFormatter, line_width: int | None = None) -> None:
self.fmt = fmt
self.adj = fmt.adj
self.frame = fmt.frame
self.line_width = line_width
def to_string(self) -> str:
text = self._get_string_representation()
if self.fmt.should_show_dimensions:
text = f"{text}{self.fmt.dimensions_info}"
return text
def _get_strcols(self) -> list[list[str]]:
strcols = self.fmt.get_strcols()
if self.fmt.is_truncated:
strcols = self._insert_dot_separators(strcols)
return strcols
def _get_string_representation(self) -> str:
if self.fmt.frame.empty:
return self._empty_info_line
strcols = self._get_strcols()
if self.line_width is None:
# no need to wrap around just print the whole frame
return self.adj.adjoin(1, *strcols)
if self._need_to_wrap_around:
return self._join_multiline(strcols)
return self._fit_strcols_to_terminal_width(strcols)
@property
def _empty_info_line(self) -> str:
return (
f"Empty {type(self.frame).__name__}\n"
f"Columns: {pprint_thing(self.frame.columns)}\n"
f"Index: {pprint_thing(self.frame.index)}"
)
@property
def _need_to_wrap_around(self) -> bool:
return bool(self.fmt.max_cols is None or self.fmt.max_cols > 0)
def _insert_dot_separators(self, strcols: list[list[str]]) -> list[list[str]]:
str_index = self.fmt._get_formatted_index(self.fmt.tr_frame)
index_length = len(str_index)
if self.fmt.is_truncated_horizontally:
strcols = self._insert_dot_separator_horizontal(strcols, index_length)
if self.fmt.is_truncated_vertically:
strcols = self._insert_dot_separator_vertical(strcols, index_length)
return strcols
@property
def _adjusted_tr_col_num(self) -> int:
return self.fmt.tr_col_num + 1 if self.fmt.index else self.fmt.tr_col_num
def _insert_dot_separator_horizontal(
self, strcols: list[list[str]], index_length: int
) -> list[list[str]]:
strcols.insert(self._adjusted_tr_col_num, [" ..."] * index_length)
return strcols
def _insert_dot_separator_vertical(
self, strcols: list[list[str]], index_length: int
) -> list[list[str]]:
n_header_rows = index_length - len(self.fmt.tr_frame)
row_num = self.fmt.tr_row_num
for ix, col in enumerate(strcols):
cwidth = self.adj.len(col[row_num])
if self.fmt.is_truncated_horizontally:
is_dot_col = ix == self._adjusted_tr_col_num
else:
is_dot_col = False
if cwidth > 3 or is_dot_col:
dots = "..."
else:
dots = ".."
if ix == 0 and self.fmt.index:
dot_mode = "left"
elif is_dot_col:
cwidth = 4
dot_mode = "right"
else:
dot_mode = "right"
dot_str = self.adj.justify([dots], cwidth, mode=dot_mode)[0]
col.insert(row_num + n_header_rows, dot_str)
return strcols
def _join_multiline(self, strcols_input: Iterable[list[str]]) -> str:
lwidth = self.line_width
adjoin_width = 1
strcols = list(strcols_input)
if self.fmt.index:
idx = strcols.pop(0)
lwidth -= np.array([self.adj.len(x) for x in idx]).max() + adjoin_width
col_widths = [
np.array([self.adj.len(x) for x in col]).max() if len(col) > 0 else 0
for col in strcols
]
assert lwidth is not None
col_bins = _binify(col_widths, lwidth)
nbins = len(col_bins)
str_lst = []
start = 0
for i, end in enumerate(col_bins):
row = strcols[start:end]
if self.fmt.index:
row.insert(0, idx)
if nbins > 1:
nrows = len(row[-1])
if end <= len(strcols) and i < nbins - 1:
row.append([" \\"] + [" "] * (nrows - 1))
else:
row.append([" "] * nrows)
str_lst.append(self.adj.adjoin(adjoin_width, *row))
start = end
return "\n\n".join(str_lst)
def _fit_strcols_to_terminal_width(self, strcols: list[list[str]]) -> str:
from pandas import Series
lines = self.adj.adjoin(1, *strcols).split("\n")
max_len = Series(lines).str.len().max()
# plus truncate dot col
width, _ = get_terminal_size()
dif = max_len - width
# '+ 1' to avoid too wide repr (GH PR #17023)
adj_dif = dif + 1
col_lens = Series([Series(ele).str.len().max() for ele in strcols])
n_cols = len(col_lens)
counter = 0
while adj_dif > 0 and n_cols > 1:
counter += 1
mid = round(n_cols / 2)
mid_ix = col_lens.index[mid]
col_len = col_lens[mid_ix]
# adjoin adds one
adj_dif -= col_len + 1
col_lens = col_lens.drop(mid_ix)
n_cols = len(col_lens)
# subtract index column
max_cols_fitted = n_cols - self.fmt.index
# GH-21180. Ensure that we print at least two.
max_cols_fitted = max(max_cols_fitted, 2)
self.fmt.max_cols_fitted = max_cols_fitted
# Call again _truncate to cut frame appropriately
# and then generate string representation
self.fmt.truncate()
strcols = self._get_strcols()
return self.adj.adjoin(1, *strcols)
def _binify(cols: list[int], line_width: int) -> list[int]:
adjoin_width = 1
bins = []
curr_width = 0
i_last_column = len(cols) - 1
for i, w in enumerate(cols):
w_adjoined = w + adjoin_width
curr_width += w_adjoined
if i_last_column == i:
wrap = curr_width + 1 > line_width and i > 0
else:
wrap = curr_width + 2 > line_width and i > 0
if wrap:
bins.append(i)
curr_width = w_adjoined
bins.append(len(cols))
return bins
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