Source code for evennia.utils.evtable

"""
This is an advanced ASCII table creator. It was inspired by Prettytable
(https://code.google.com/p/prettytable/) but shares no code and is considerably
more advanced, supporting auto-balancing of incomplete tables and ANSI colors among
other things.

Example usage:

```python
  from evennia.utils import evtable

  table = evtable.EvTable("Heading1", "Heading2",
                  table=[[1,2,3],[4,5,6],[7,8,9]], border="cells")
  table.add_column("This is long data", "This is even longer data")
  table.add_row("This is a single row")
  print table
```

Result:

::

    +----------------------+----------+---+--------------------------+
    |       Heading1       | Heading2 |   |                          |
    +~~~~~~~~~~~~~~~~~~~~~~+~~~~~~~~~~+~~~+~~~~~~~~~~~~~~~~~~~~~~~~~~+
    |           1          |     4    | 7 |     This is long data    |
    +----------------------+----------+---+--------------------------+
    |           2          |     5    | 8 | This is even longer data |
    +----------------------+----------+---+--------------------------+
    |           3          |     6    | 9 |                          |
    +----------------------+----------+---+--------------------------+
    | This is a single row |          |   |                          |
    +----------------------+----------+---+--------------------------+

As seen, the table will automatically expand with empty cells to make
the table symmetric. Tables can be restricted to a given width:

```python
  table.reformat(width=50, align="l")
```

(We could just have added these keywords to the table creation call)

This yields the following result:

::

    +-----------+------------+-----------+-----------+
    | Heading1  | Heading2   |           |           |
    +~~~~~~~~~~~+~~~~~~~~~~~~+~~~~~~~~~~~+~~~~~~~~~~~+
    | 1         | 4          | 7         | This is   |
    |           |            |           | long data |
    +-----------+------------+-----------+-----------+
    |           |            |           | This is   |
    | 2         | 5          | 8         | even      |
    |           |            |           | longer    |
    |           |            |           | data      |
    +-----------+------------+-----------+-----------+
    | 3         | 6          | 9         |           |
    +-----------+------------+-----------+-----------+
    | This is a |            |           |           |
    |  single   |            |           |           |
    | row       |            |           |           |
    +-----------+------------+-----------+-----------+


Table-columns can be individually formatted. Note that if an
individual column is set with a specific width, table auto-balancing
will not affect this column (this may lead to the full table being too
wide, so be careful mixing fixed-width columns with auto- balancing).
Here we change the width and alignment of the column at index 3
(Python starts from 0):

```python

table.reformat_column(3, width=30, align="r")
print table
```

::

    +-----------+-------+-----+-----------------------------+---------+
    | Heading1  | Headi |     |                             |         |
    |           | ng2   |     |                             |         |
    +~~~~~~~~~~~+~~~~~~~+~~~~~+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+~~~~~~~~~+
    | 1         | 4     | 7   |           This is long data | Test1   |
    +-----------+-------+-----+-----------------------------+---------+
    | 2         | 5     | 8   |    This is even longer data | Test3   |
    +-----------+-------+-----+-----------------------------+---------+
    | 3         | 6     | 9   |                             | Test4   |
    +-----------+-------+-----+-----------------------------+---------+
    | This is a |       |     |                             |         |
    |  single   |       |     |                             |         |
    | row       |       |     |                             |         |
    +-----------+-------+-----+-----------------------------+---------+

When adding new rows/columns their data can have its own alignments
(left/center/right, top/center/bottom).

If the height is restricted, cells will be restricted from expanding
vertically. This will lead to text contents being cropped. Each cell
can only shrink to a minimum width and height of 1.

`EvTable` is intended to be used with `ANSIString` for supporting ANSI-coloured
string types.

When a cell is auto-wrapped across multiple lines, ANSI-reset sequences will be
put at the end of each wrapped line. This means that the colour of a wrapped
cell will not "bleed", but it also means that eventual colour outside the table
will not transfer "across" a table, you need to re-set the color to have it
appear on both sides of the table string.

----

"""

from django.conf import settings
from textwrap import TextWrapper
from copy import deepcopy, copy
from evennia.utils.utils import is_iter, display_len as d_len
from evennia.utils.ansi import ANSIString

_DEFAULT_WIDTH = settings.CLIENT_DEFAULT_WIDTH


def _to_ansi(obj):
    """
    convert to ANSIString.

    Args:
        obj (str): Convert incoming text to
            be ANSI aware ANSIStrings.
    """
    if is_iter(obj):
        return [_to_ansi(o) for o in obj]
    else:
        return ANSIString(obj)


_whitespace = "\t\n\x0b\x0c\r "


[docs]class ANSITextWrapper(TextWrapper): """ This is a wrapper work class for handling strings with ANSI tags in it. It overloads the standard library `TextWrapper` class and is used internally in `EvTable` and has no public methods. """ def _munge_whitespace(self, text): """_munge_whitespace(text : string) -> string Munge whitespace in text: expand tabs and convert all other whitespace characters to spaces. Eg. " foo\tbar\n\nbaz" becomes " foo bar baz". """ return text # TODO: Ignore expand_tabs/replace_whitespace until ANSIString handles them. # - don't remove this code. /Griatch # if self.expand_tabs: # text = text.expandtabs() # if self.replace_whitespace: # if isinstance(text, str): # text = text.translate(self.whitespace_trans) # return text def _split(self, text): """_split(text : string) -> [string] Split the text to wrap into indivisible chunks. Chunks are not quite the same as words; see _wrap_chunks() for full details. As an example, the text Look, goof-ball -- use the -b option! breaks into the following chunks: 'Look,', ' ', 'goof-', 'ball', ' ', '--', ' ', 'use', ' ', 'the', ' ', '-b', ' ', 'option!' if break_on_hyphens is True, or in: 'Look,', ' ', 'goof-ball', ' ', '--', ' ', 'use', ' ', 'the', ' ', '-b', ' ', option!' otherwise. """ # NOTE-PYTHON3: The following code only roughly approximates what this # function used to do. Regex splitting on ANSIStrings is # dropping ANSI codes, so we're using ANSIString.split # for the time being. # # A less hackier solution would be appreciated. chunks = _to_ansi(text).split() chunks = [chunk + " " for chunk in chunks if chunk] # remove empty chunks if len(chunks) > 1: chunks[-1] = chunks[-1][0:-1] return chunks def _wrap_chunks(self, chunks): """_wrap_chunks(chunks : [string]) -> [string] Wrap a sequence of text chunks and return a list of lines of length 'self.width' or less. (If 'break_long_words' is false, some lines may be longer than this.) Chunks correspond roughly to words and the whitespace between them: each chunk is indivisible (modulo 'break_long_words'), but a line break can come between any two chunks. Chunks should not have internal whitespace; ie. a chunk is either all whitespace or a "word". Whitespace chunks will be removed from the beginning and end of lines, but apart from that whitespace is preserved. """ lines = [] if self.width <= 0: raise ValueError("invalid width %r (must be > 0)" % self.width) # Arrange in reverse order so items can be efficiently popped # from a stack of chucks. chunks.reverse() while chunks: # Start the list of chunks that will make up the current line. # cur_len is just the length of all the chunks in cur_line. cur_line = [] cur_len = 0 # Figure out which static string will prefix this line. if lines: indent = self.subsequent_indent else: indent = self.initial_indent # Maximum width for this line. width = self.width - d_len(indent) # First chunk on line is whitespace -- drop it, unless this # is the very beginning of the text (ie. no lines started yet). if self.drop_whitespace and chunks[-1].strip() == "" and lines: del chunks[-1] while chunks: ln = d_len(chunks[-1]) # Can at least squeeze this chunk onto the current line. if cur_len + ln <= width: cur_line.append(chunks.pop()) cur_len += ln # Nope, this line is full. else: break # The current line is full, and the next chunk is too big to # fit on *any* line (not just this one). if chunks and d_len(chunks[-1]) > width: self._handle_long_word(chunks, cur_line, cur_len, width) # If the last chunk on this line is all whitespace, drop it. if self.drop_whitespace and cur_line and cur_line[-1].strip() == "": del cur_line[-1] # Convert current line back to a string and store it in list # of all lines (return value). if cur_line: ln = "" for w in cur_line: # ANSI fix ln += w # lines.append(indent + ln) return lines
# -- Convenience interface ---------------------------------------------
[docs]def wrap(text, width=_DEFAULT_WIDTH, **kwargs): """ Wrap a single paragraph of text, returning a list of wrapped lines. Reformat the single paragraph in 'text' so it fits in lines of no more than 'width' columns, and return a list of wrapped lines. By default, tabs in 'text' are expanded with string.expandtabs(), and all other whitespace characters (including newline) are converted to Args: text (str): Text to wrap. width (int, optional): Width to wrap `text` to. Keyword Args: See TextWrapper class for available keyword args to customize wrapping behaviour. """ w = ANSITextWrapper(width=width, **kwargs) return w.wrap(text)
[docs]def fill(text, width=_DEFAULT_WIDTH, **kwargs): """Fill a single paragraph of text, returning a new string. Reformat the single paragraph in 'text' to fit in lines of no more than 'width' columns, and return a new string containing the entire wrapped paragraph. As with wrap(), tabs are expanded and other whitespace characters converted to space. Args: text (str): Text to fill. width (int, optional): Width of fill area. Keyword Args: See TextWrapper class for available keyword args to customize filling behaviour. """ w = ANSITextWrapper(width=width, **kwargs) return w.fill(text)
# EvCell class (see further down for the EvTable itself)
[docs]class EvCell: """ Holds a single data cell for the table. A cell has a certain width and height and contains one or more lines of data. It can shrink and resize as needed. """
[docs] def __init__(self, data, **kwargs): """ Args: data (str): The un-padded data of the entry. Keyword Args: width (int): Desired width of cell. It will pad to this size. height (int): Desired height of cell. it will pad to this size. pad_width (int): General padding width. This can be overruled by individual settings below. pad_left (int): Number of extra pad characters on the left. pad_right (int): Number of extra pad characters on the right. pad_top (int): Number of extra pad lines top (will pad with `vpad_char`). pad_bottom (int): Number of extra pad lines bottom (will pad with `vpad_char`). pad_char (str)- pad character to use for padding. This is overruled by individual settings below (default `" "`). hpad_char (str): Pad character to use both for extra horizontal padding (default `" "`). vpad_char (str): Pad character to use for extra vertical padding and for vertical fill (default `" "`). fill_char (str): Character used to filling (expanding cells to desired size). This can be overruled by individual settings below. hfill_char (str): Character used for horizontal fill (default `" "`). vfill_char (str): Character used for vertical fill (default `" "`). align (str): Should be one of "l", "r" or "c" for left-, right- or center horizontal alignment respectively. Default is left-aligned. valign (str): Should be one of "t", "b" or "c" for top-, bottom and center vertical alignment respectively. Default is centered. border_width (int): General border width. This is overruled by individual settings below. border_left (int): Left border width. border_right (int): Right border width. border_top (int): Top border width. border_bottom (int): Bottom border width. border_char (str): This will use a single border char for all borders. overruled by individual settings below. border_left_char (str): Char used for left border. border_right_char (str): Char used for right border. border_top_char (str): Char used for top border. border_bottom_char (str): Char user for bottom border. corner_char (str): Character used when two borders cross. (default is ""). This is overruled by individual settings below. corner_top_left_char (str): Char used for "nw" corner. corner_top_right_char (str): Char used for "ne" corner. corner_bottom_left_char (str): Char used for "sw" corner. corner_bottom_right_char (str): Char used for "se" corner. crop_string (str): String to use when cropping sideways, default is `'[...]'`. crop (bool): Crop contentof cell rather than expand vertically, default=`False`. enforce_size (bool): If true, the width/height of the cell is strictly enforced and extra text will be cropped rather than the cell growing vertically. Raises: Exception: for impossible cell size requirements where the border width or height cannot fit, or the content is too small. """ self.formatted = None padwidth = kwargs.get("pad_width", None) padwidth = int(padwidth) if padwidth is not None else None self.pad_left = int(kwargs.get("pad_left", padwidth if padwidth is not None else 1)) self.pad_right = int(kwargs.get("pad_right", padwidth if padwidth is not None else 1)) self.pad_top = int(kwargs.get("pad_top", padwidth if padwidth is not None else 0)) self.pad_bottom = int(kwargs.get("pad_bottom", padwidth if padwidth is not None else 0)) self.enforce_size = kwargs.get("enforce_size", False) # avoid multi-char pad_chars messing up counting pad_char = kwargs.get("pad_char", " ") pad_char = pad_char[0] if pad_char else " " hpad_char = kwargs.get("hpad_char", pad_char) self.hpad_char = hpad_char[0] if hpad_char else pad_char vpad_char = kwargs.get("vpad_char", pad_char) self.vpad_char = vpad_char[0] if vpad_char else pad_char fill_char = kwargs.get("fill_char", " ") fill_char = fill_char[0] if fill_char else " " hfill_char = kwargs.get("hfill_char", fill_char) self.hfill_char = hfill_char[0] if hfill_char else " " vfill_char = kwargs.get("vfill_char", fill_char) self.vfill_char = vfill_char[0] if vfill_char else " " self.crop_string = kwargs.get("crop_string", "[...]") # borders and corners borderwidth = kwargs.get("border_width", 0) self.border_left = kwargs.get("border_left", borderwidth) self.border_right = kwargs.get("border_right", borderwidth) self.border_top = kwargs.get("border_top", borderwidth) self.border_bottom = kwargs.get("border_bottom", borderwidth) borderchar = kwargs.get("border_char", None) self.border_left_char = kwargs.get("border_left_char", borderchar if borderchar else "|") self.border_right_char = kwargs.get( "border_right_char", borderchar if borderchar else self.border_left_char ) self.border_top_char = kwargs.get("border_top_char", borderchar if borderchar else "-") self.border_bottom_char = kwargs.get( "border_bottom_char", borderchar if borderchar else self.border_top_char ) corner_char = kwargs.get("corner_char", "+") self.corner_top_left_char = kwargs.get("corner_top_left_char", corner_char) self.corner_top_right_char = kwargs.get("corner_top_right_char", corner_char) self.corner_bottom_left_char = kwargs.get("corner_bottom_left_char", corner_char) self.corner_bottom_right_char = kwargs.get("corner_bottom_right_char", corner_char) # alignments self.align = kwargs.get("align", "l") self.valign = kwargs.get("valign", "c") self.data = self._split_lines(_to_ansi(data)) self.raw_width = max(d_len(line) for line in self.data) self.raw_height = len(self.data) # this is extra trimming required for cels in the middle of a table only self.trim_horizontal = 0 self.trim_vertical = 0 # width/height is given without left/right or top/bottom padding if "width" in kwargs: width = kwargs.pop("width") self.width = ( width - self.pad_left - self.pad_right - self.border_left - self.border_right ) if self.width <= 0 < self.raw_width: raise Exception("Cell width too small - no space for data.") else: self.width = self.raw_width if "height" in kwargs: height = kwargs.pop("height") self.height = ( height - self.pad_top - self.pad_bottom - self.border_top - self.border_bottom ) if self.height <= 0 < self.raw_height: raise Exception("Cell height too small - no space for data.") else: self.height = self.raw_height
# prepare data # self.formatted = self._reformat() def _crop(self, text, width): """ Apply cropping of text. Args: text (str): The text to crop. width (int): The width to crop `text` to. """ if d_len(text) > width: crop_string = self.crop_string return text[: width - d_len(crop_string)] + crop_string return text def _reformat(self): """ Apply all EvCells' formatting operations. """ data = self._border(self._pad(self._valign(self._align(self._fit_width(self.data))))) return data def _split_lines(self, text): """ Simply split by linebreaks Args: text (str): text to split. Returns: split (list): split text. """ return text.split("\n") def _fit_width(self, data): """ Split too-long lines to fit the desired width of the Cell. Args: data (str): Text to adjust to the cell's width. Returns: adjusted data (str): The adjusted text. Notes: This also updates `raw_width`. """ width = self.width adjusted_data = [] for line in data: if 0 < width < d_len(line): # replace_whitespace=False, expand_tabs=False is a # fix for ANSIString not supporting expand_tabs/translate adjusted_data.extend( [ ANSIString(part + ANSIString("|n")) for part in wrap(line, width=width, drop_whitespace=False) ] ) else: adjusted_data.append(line) if self.enforce_size: # don't allow too high cells excess = len(adjusted_data) - self.height if excess > 0: # too many lines. Crop and mark last line with crop_string crop_string = self.crop_string adjusted_data = adjusted_data[:-excess] crop_string_length = len(crop_string) if len(adjusted_data[-1]) > crop_string_length: adjusted_data[-1] = adjusted_data[-1][:-crop_string_length] + crop_string else: adjusted_data[-1] += crop_string elif excess < 0: # too few lines. Fill to height. adjusted_data.extend(["" for _ in range(excess)]) return adjusted_data def _center(self, text, width, pad_char): """ Horizontally center text on line of certain width, using padding. Args: text (str): The text to center. width (int): How wide the area is (in characters) where `text` should be centered. pad_char (str): Which padding character to use. Returns: text (str): Centered text. """ excess = width - d_len(text) if excess <= 0: return text if excess % 2: # uneven padding narrowside = (excess // 2) * pad_char widerside = narrowside + pad_char if width % 2: return narrowside + text + widerside else: return widerside + text + narrowside else: # even padding - same on both sides side = (excess // 2) * pad_char return side + text + side def _align(self, data): """ Align list of rows of cell. Whitespace characters will be stripped if there is only one whitespace character - otherwise, it's assumed the caller may be trying some manual formatting in the text. Args: data (str): Text to align. Returns: text (str): Aligned result. """ align = self.align hfill_char = self.hfill_char width = self.width if align == "l": lines = [ ( line.lstrip(" ") + " " if line.startswith(" ") and not line.startswith(" ") else line ) + hfill_char * (width - d_len(line)) for line in data ] return lines elif align == "r": return [ hfill_char * (width - d_len(line)) + ( " " + line.rstrip(" ") if line.endswith(" ") and not line.endswith(" ") else line ) for line in data ] else: # center, 'c' return [self._center(line, self.width, self.hfill_char) for line in data] def _valign(self, data): """ Align cell vertically Args: data (str): Text to align. Returns: text (str): Vertically aligned text. """ valign = self.valign height = self.height cheight = len(data) excess = height - cheight padline = self.vfill_char * self.width if excess <= 0: return data # only care if we need to add new lines if valign == "t": return data + [padline for _ in range(excess)] elif valign == "b": return [padline for _ in range(excess)] + data else: # center narrowside = [padline for _ in range(excess // 2)] widerside = narrowside + [padline] if excess % 2: # uneven padding if height % 2: return widerside + data + narrowside else: return narrowside + data + widerside else: # even padding, same on both sides return narrowside + data + narrowside def _pad(self, data): """ Pad data with extra characters on all sides. Args: data (str): Text to pad. Returns: text (str): Padded text. """ left = self.hpad_char * self.pad_left right = self.hpad_char * self.pad_right vfill = (self.width + self.pad_left + self.pad_right) * self.vpad_char top = [vfill for _ in range(self.pad_top)] bottom = [vfill for _ in range(self.pad_bottom)] return top + [left + line + right for line in data] + bottom def _border(self, data): """ Add borders to the cell. Args: data (str): Text to surround with borders. Return: text (str): Text with borders. """ left = self.border_left_char * self.border_left + ANSIString("|n") right = ANSIString("|n") + self.border_right_char * self.border_right cwidth = ( self.width + self.pad_left + self.pad_right + max(0, self.border_left - 1) + max(0, self.border_right - 1) ) vfill = self.corner_top_left_char if left else "" vfill += cwidth * self.border_top_char vfill += self.corner_top_right_char if right else "" top = [vfill for _ in range(self.border_top)] vfill = self.corner_bottom_left_char if left else "" vfill += cwidth * self.border_bottom_char vfill += self.corner_bottom_right_char if right else "" bottom = [vfill for _ in range(self.border_bottom)] return top + [left + line + right for line in data] + bottom
[docs] def get_min_height(self): """ Get the minimum possible height of cell, including at least one line for data. Returns: min_height (int): The mininum height of cell. """ return self.pad_top + self.pad_bottom + self.border_bottom + self.border_top + 1
[docs] def get_min_width(self): """ Get the minimum possible width of cell, including at least one character-width for data. Returns: min_width (int): The minimum width of cell. """ return self.pad_left + self.pad_right + self.border_left + self.border_right + 1
[docs] def get_height(self): """ Get natural height of cell, including padding. Returns: natural_height (int): Height of cell. """ return len(self.formatted) # if self.formatted else 0
[docs] def get_width(self): """ Get natural width of cell, including padding. Returns: natural_width (int): Width of cell. """ return d_len(self.formatted[0]) # if self.formatted else 0
[docs] def replace_data(self, data, **kwargs): """ Replace cell data. This causes a full reformat of the cell. Args: data (str): Cell data. Notes: The available keyword arguments are the same as for `EvCell.__init__`. """ self.data = self._split_lines(_to_ansi(data)) self.raw_width = max(d_len(line) for line in self.data) self.raw_height = len(self.data) self.reformat(**kwargs)
[docs] def reformat(self, **kwargs): """ Reformat the EvCell with new options Keyword Args: The available keyword arguments are the same as for `EvCell.__init__`. Raises: Exception: If the cells cannot shrink enough to accomodate the options or the data given. """ # keywords that require manipulation padwidth = kwargs.get("pad_width", None) padwidth = int(padwidth) if padwidth is not None else None self.pad_left = int( kwargs.pop("pad_left", padwidth if padwidth is not None else self.pad_left) ) self.pad_right = int( kwargs.pop("pad_right", padwidth if padwidth is not None else self.pad_right) ) self.pad_top = int( kwargs.pop("pad_top", padwidth if padwidth is not None else self.pad_top) ) self.pad_bottom = int( kwargs.pop("pad_bottom", padwidth if padwidth is not None else self.pad_bottom) ) self.enforce_size = kwargs.get("enforce_size", False) pad_char = kwargs.pop("pad_char", None) hpad_char = kwargs.pop("hpad_char", pad_char) self.hpad_char = hpad_char[0] if hpad_char else self.hpad_char vpad_char = kwargs.pop("vpad_char", pad_char) self.vpad_char = vpad_char[0] if vpad_char else self.vpad_char fillchar = kwargs.pop("fill_char", None) hfill_char = kwargs.pop("hfill_char", fillchar) self.hfill_char = hfill_char[0] if hfill_char else self.hfill_char vfill_char = kwargs.pop("vfill_char", fillchar) self.vfill_char = vfill_char[0] if vfill_char else self.vfill_char borderwidth = kwargs.get("border_width", None) self.border_left = kwargs.pop( "border_left", borderwidth if borderwidth is not None else self.border_left ) self.border_right = kwargs.pop( "border_right", borderwidth if borderwidth is not None else self.border_right ) self.border_top = kwargs.pop( "border_top", borderwidth if borderwidth is not None else self.border_top ) self.border_bottom = kwargs.pop( "border_bottom", borderwidth if borderwidth is not None else self.border_bottom ) borderchar = kwargs.get("border_char", None) self.border_left_char = kwargs.pop( "border_left_char", borderchar if borderchar else self.border_left_char ) self.border_right_char = kwargs.pop( "border_right_char", borderchar if borderchar else self.border_right_char ) self.border_top_char = kwargs.pop( "border_topchar", borderchar if borderchar else self.border_top_char ) self.border_bottom_char = kwargs.pop( "border_bottom_char", borderchar if borderchar else self.border_bottom_char ) corner_char = kwargs.get("corner_char", None) self.corner_top_left_char = kwargs.pop( "corner_top_left", corner_char if corner_char is not None else self.corner_top_left_char ) self.corner_top_right_char = kwargs.pop( "corner_top_right", corner_char if corner_char is not None else self.corner_top_right_char, ) self.corner_bottom_left_char = kwargs.pop( "corner_bottom_left", corner_char if corner_char is not None else self.corner_bottom_left_char, ) self.corner_bottom_right_char = kwargs.pop( "corner_bottom_right", corner_char if corner_char is not None else self.corner_bottom_right_char, ) # this is used by the table to adjust size of cells with borders in the middle # of the table self.trim_horizontal = kwargs.pop("trim_horizontal", self.trim_horizontal) self.trim_vertical = kwargs.pop("trim_vertical", self.trim_vertical) # fill all other properties for key, value in kwargs.items(): setattr(self, key, value) # Handle sizes if "width" in kwargs: width = kwargs.pop("width") self.width = ( width - self.pad_left - self.pad_right - self.border_left - self.border_right + self.trim_horizontal ) # if self.width <= 0 and self.raw_width > 0: if self.width <= 0 < self.raw_width: raise Exception("Cell width too small, no room for data.") if "height" in kwargs: height = kwargs.pop("height") self.height = ( height - self.pad_top - self.pad_bottom - self.border_top - self.border_bottom + self.trim_vertical ) if self.height <= 0 < self.raw_height: raise Exception("Cell height too small, no room for data.") # reformat (to new sizes, padding, header and borders) self.formatted = self._reformat()
[docs] def get(self): """ Get data, padded and aligned in the form of a list of lines. """ self.formatted = self._reformat() return self.formatted
def __repr__(self): self.formatted = self._reformat() return str(ANSIString("<EvCel %s>" % self.formatted)) def __str__(self): "returns cell contents on string form" self.formatted = self._reformat() return str(ANSIString("\n").join(self.formatted))
# EvColumn class
[docs]class EvColumn(object): """ This class holds a list of Cells to represent a column of a table. It holds operations and settings that affect *all* cells in the column. Columns are not intended to be used stand-alone; they should be incorporated into an EvTable (like EvCells) """
[docs] def __init__(self, *args, **kwargs): """ Args: Text for each row in the column Keyword Args: All `EvCell.__init_` keywords are available, these settings will be persistently applied to every Cell in the column. """ self.options = kwargs # column-specific options self.column = [EvCell(data, **kwargs) for data in args]
def _balance(self, **kwargs): """ Make sure to adjust the width of all cells so we form a coherent and lined-up column. Will enforce column-specific options to cells. Keyword Args: Extra keywords to modify the column setting. Same keywords as in `EvCell.__init__`. """ col = self.column # fixed options for the column will override those requested in the call! # this is particularly relevant to things like width/height, to avoid # fixed-widths columns from being auto-balanced kwargs.update(self.options) # use fixed width or adjust to the largest cell if "width" not in kwargs: [ cell.reformat() for cell in col ] # this is necessary to get initial widths of all cells kwargs["width"] = max(cell.get_width() for cell in col) if col else 0 [cell.reformat(**kwargs) for cell in col]
[docs] def add_rows(self, *args, **kwargs): """ Add new cells to column. They will be inserted as a series of rows. It will inherit the options of the rest of the column's cells (use update to change options). Args: Texts for the new cells ypos (int, optional): Index position in table before which to insert the new column. Uses Python indexing, so to insert at the top, use `ypos=0`. If not given, data will be inserted at the end of the column. Keyword Args: Available keywods as per `EvCell.__init__`. """ # column-level options override those in kwargs options = {**kwargs, **self.options} ypos = kwargs.get("ypos", None) if ypos is None or ypos > len(self.column): # add to the end self.column.extend([EvCell(data, **options) for data in args]) else: # insert cells before given index ypos = min(len(self.column) - 1, max(0, int(ypos))) new_cells = [EvCell(data, **options) for data in args] self.column = self.column[:ypos] + new_cells + self.column[ypos:]
# self._balance(**kwargs)
[docs] def reformat(self, **kwargs): """ Change the options for the column. Keyword Args: Keywords as per `EvCell.__init__`. """ self._balance(**kwargs)
[docs] def reformat_cell(self, index, **kwargs): """ reformat cell at given index, keeping column options if necessary. Args: index (int): Index location of the cell in the column, starting from 0 for the first row to Nrows-1. Keyword Args: Keywords as per `EvCell.__init__`. """ # column-level options take precedence here kwargs.update(self.options) self.column[index].reformat(**kwargs)
def __repr__(self): return "<EvColumn\n %s>" % ("\n ".join([repr(cell) for cell in self.column])) def __len__(self): return len(self.column) def __iter__(self): return iter(self.column) def __getitem__(self, index): return self.column[index] def __setitem__(self, index, value): self.column[index] = value def __delitem__(self, index): del self.column[index]
# Main Evtable class
[docs]class EvTable(object): """ The table class holds a list of EvColumns, each consisting of EvCells so that the result is a 2D matrix. """
[docs] def __init__(self, *args, **kwargs): """ Args: Header texts for the table. Keyword Args: table (list of lists or list of `EvColumns`, optional): This is used to build the table in a quick way. If not given, the table will start out empty and `add_` methods need to be used to add rows/columns. header (bool, optional): `True`/`False` - turn off the header texts (`*args`) being treated as a header (such as not adding extra underlining) pad_width (int, optional): How much empty space to pad your cells with (default is 1) border (str, optional)): The border style to use. This is one of - `None` - No border drawing at all. - "table" - only a border around the whole table. - "tablecols" - table and column borders. (default) - "header" - only border under header. - "cols" - only vertical borders. - "incols" - vertical borders, no outer edges. - "rows" - only borders between rows. - "cells" - border around all cells. border_width (int, optional): Width of table borders, if border is active. Note that widths wider than 1 may give artifacts in the corners. Default is 1. corner_char (str, optional): Character to use in corners when border is active. Default is `+`. corner_top_left_char (str, optional): Character used for "nw" corner of table. Defaults to `corner_char`. corner_top_right_char (str, optional): Character used for "ne" corner of table. Defaults to `corner_char`. corner_bottom_left_char (str, optional): Character used for "sw" corner of table. Defaults to `corner_char`. corner_bottom_right_char (str, optional): Character used for "se" corner of table. Defaults to `corner_char`. pretty_corners (bool, optional): Use custom characters to make the table corners look "rounded". Uses UTF-8 characters. Defaults to `False` for maximum compatibility with various displays that may occationally have issues with UTF-8 characters. header_line_char (str, optional): Character to use for underlining the header row (default is '~'). Requires `border` to not be `None`. width (int, optional): Fixed width of table. If not set, width is set by the total width of each column. This will resize individual columns in the vertical direction to fit. height (int, optional): Fixed height of table. Defaults to being unset. Width is still given precedence. If given, table cells will crop text rather than expand vertically. evenwidth (bool, optional): Used with the `width` keyword. Adjusts columns to have as even width as possible. This often looks best also for mixed-length tables. Default is `False`. maxwidth (int, optional): This will set a maximum width of the table while allowing it to be smaller. Only if it grows wider than this size will it be resized by expanding horizontally (or crop `height` is given). This keyword has no meaning if `width` is set. Raises: Exception: If given erroneous input or width settings for the data. Notes: Beyond those table-specific keywords, the non-overlapping keywords of `EvCell.__init__` are also available. These will be passed down to every cell in the table. """ # at this point table is a 2D grid - a list of columns # x is the column position, y the row table = kwargs.pop("table", []) # header is a list of texts. We merge it to the table's top header = [_to_ansi(head) for head in args] self.header = header != [] if self.header: if table: excess = len(header) - len(table) if excess > 0: # header bigger than table table.extend([] for _ in range(excess)) elif excess < 0: # too short header header.extend(_to_ansi(["" for _ in range(abs(excess))])) for ix, heading in enumerate(header): table[ix].insert(0, heading) else: table = [[heading] for heading in header] # even though we inserted the header, we can still turn off # header border underling etc. We only allow this if a header # was actually set self.header = kwargs.pop("header", self.header) if self.header else False hchar = kwargs.pop("header_line_char", "~") self.header_line_char = hchar[0] if hchar else "~" border = kwargs.pop("border", "tablecols") if border is None: border = "none" if border not in ( "none", "table", "tablecols", "header", "incols", "cols", "rows", "cells", ): raise Exception("Unsupported border type: '%s'" % border) self.border = border # border settings are passed into Cell as well (so kwargs.get and not pop) self.border_width = kwargs.get("border_width", 1) self.corner_char = kwargs.get("corner_char", "+") pcorners = kwargs.pop("pretty_corners", False) self.corner_top_left_char = _to_ansi( kwargs.pop("corner_top_left_char", "." if pcorners else self.corner_char) ) self.corner_top_right_char = _to_ansi( kwargs.pop("corner_top_right_char", "." if pcorners else self.corner_char) ) self.corner_bottom_left_char = _to_ansi( kwargs.pop("corner_bottom_left_char", " " if pcorners else self.corner_char) ) self.corner_bottom_right_char = _to_ansi( kwargs.pop("corner_bottom_right_char", " " if pcorners else self.corner_char) ) self.width = kwargs.pop("width", None) self.height = kwargs.pop("height", None) self.evenwidth = kwargs.pop("evenwidth", False) self.maxwidth = kwargs.pop("maxwidth", None) if self.maxwidth and self.width and self.maxwidth < self.width: raise Exception("table maxwidth < table width!") # size in cell cols/rows self.ncols = len(table) self.nrows = max(len(col) for col in table) if table else 0 # size in characters (gets set when _balance is called) self.nwidth = 0 self.nheight = 0 # save options self.options = kwargs # use the temporary table to generate the table on the fly, as a list of EvColumns self.table = [EvColumn(*col, **kwargs) for col in table] # this is the actual working table self.worktable = None
# balance the table # self._balance() def _cellborders(self, ix, iy, nx, ny, **kwargs): """ Adds borders to the table by adjusting the input kwarg to instruct cells to build a border in the right positions. Args: ix (int): x index positions in table. iy (int): y index positions in table. nx (int): x size of table. ny (int): y size of table. Keyword Args: Keywords as per `EvTable.__init__`. Returns: table (str): string with the correct borders. Notes: A copy of the kwarg is returned to the cell. This is method is called by self._borders. """ ret = kwargs.copy() # handle the various border modes border = self.border header = self.header bwidth = self.border_width headchar = self.header_line_char def corners(ret): """Handle corners of table""" if ix == 0 and iy == 0: ret["corner_top_left_char"] = self.corner_top_left_char if ix == nx and iy == 0: ret["corner_top_right_char"] = self.corner_top_right_char if ix == 0 and iy == ny: ret["corner_bottom_left_char"] = self.corner_bottom_left_char if ix == nx and iy == ny: ret["corner_bottom_right_char"] = self.corner_bottom_right_char return ret def left_edge(ret): """add vertical border along left table edge""" if ix == 0: ret["border_left"] = bwidth # ret["trim_horizontal"] = bwidth return ret def top_edge(ret): """add border along top table edge""" if iy == 0: ret["border_top"] = bwidth # ret["trim_vertical"] = bwidth return ret def right_edge(ret): """add vertical border along right table edge""" if ix == nx: # and 0 < iy < ny: ret["border_right"] = bwidth # ret["trim_horizontal"] = 0 return ret def bottom_edge(ret): """add border along bottom table edge""" if iy == ny: ret["border_bottom"] = bwidth # ret["trim_vertical"] = bwidth return ret def cols(ret): """Adding vertical borders inside the table""" if 0 <= ix < nx: ret["border_right"] = bwidth return ret def rows(ret): """Adding horizontal borders inside the table""" if 0 <= iy < ny: ret["border_bottom"] = bwidth return ret def head(ret): """Add header underline""" if iy == 0: # put different bottom line for header ret["border_bottom"] = bwidth ret["border_bottom_char"] = headchar return ret # use the helper functions to define various # table "styles" if border in ("table", "tablecols", "cells"): ret = bottom_edge(right_edge(top_edge(left_edge(corners(ret))))) if border in ("cols", "tablecols", "cells"): ret = cols(right_edge(left_edge(ret))) if border in "incols": ret = cols(ret) if border in ("rows", "cells"): ret = rows(bottom_edge(top_edge(ret))) if header and border not in ("none", None): ret = head(ret) return ret def _borders(self): """ Add borders to table. This is called from self._balance. """ nx, ny = self.ncols - 1, self.nrows - 1 options = self.options for ix, col in enumerate(self.worktable): for iy, cell in enumerate(col): col.reformat_cell(iy, **self._cellborders(ix, iy, nx, ny, **options)) def _balance(self): """ Balance the table. This means to make sure all cells on the same row have the same height, that all columns have the same number of rows and that the table fits within the given width. """ # we make all modifications on a working copy of the # actual table. This allows us to add columns/rows # and re-balance over and over without issue. self.worktable = deepcopy(self.table) # self._borders() # return options = copy(self.options) # balance number of rows to make a rectangular table # column by column ncols = len(self.worktable) nrows = [len(col) for col in self.worktable] nrowmax = max(nrows) if nrows else 0 for icol, nrow in enumerate(nrows): self.worktable[icol].reformat(**options) if nrow < nrowmax: # add more rows to too-short columns empty_rows = ["" for _ in range(nrowmax - nrow)] self.worktable[icol].add_rows(*empty_rows) self.ncols = ncols self.nrows = nrowmax # add borders - these add to the width/height, so we must do this before calculating # width/height self._borders() # equalize widths within each column cwidths = [max(cell.get_width() for cell in col) for col in self.worktable] if self.width or self.maxwidth and self.maxwidth < sum(cwidths): # we set a table width. Horizontal cells will be evenly distributed and # expand vertically as needed (unless self.height is set, see below) # use fixed width, or set to maxwidth width = self.width if self.width else self.maxwidth if ncols: # get minimum possible cell widths for each row cwidths_min = [max(cell.get_min_width() for cell in col) for col in self.worktable] cwmin = sum(cwidths_min) # get which cols have separately set widths - these should be locked # note that we need to remove cwidths_min for each lock to avoid counting # it twice (in cwmin and in locked_cols) locked_cols = { icol: col.options["width"] - cwidths_min[icol] for icol, col in enumerate(self.worktable) if "width" in col.options } locked_width = sum(locked_cols.values()) excess = width - cwmin - locked_width if len(locked_cols) >= ncols and excess: # we can't adjust the width at all - all columns are locked raise Exception( "Cannot balance table to width %s - " "all columns have a set, fixed width summing to %s!" % (self.width, sum(cwidths)) ) if excess < 0: # the locked cols makes it impossible raise Exception( "Cannot shrink table width to %s. " "Minimum size (and/or fixed-width columns) " "sets minimum at %s." % (self.width, cwmin + locked_width) ) if self.evenwidth: # make each column of equal width # use cwidths as a work-array to track weights cwidths = copy(cwidths_min) correction = 0 while correction < excess: # flood-fill the minimum table starting with the smallest columns ci = cwidths.index(min(cwidths)) if ci in locked_cols: # locked column, make sure it's not picked again cwidths[ci] += 9999 cwidths_min[ci] = locked_cols[ci] else: cwidths_min[ci] += 1 correction += 1 cwidths = cwidths_min else: # make each column expand more proportional to their data size # we use cwidth as a work-array to track weights correction = 0 while correction < excess: # fill wider columns first ci = cwidths.index(max(cwidths)) if ci in locked_cols: # locked column, make sure it's not picked again cwidths[ci] -= 9999 cwidths_min[ci] = locked_cols[ci] else: cwidths_min[ci] += 1 correction += 1 # give a just changed col less prio next run cwidths[ci] -= 3 cwidths = cwidths_min # reformat worktable (for width align) for ix, col in enumerate(self.worktable): try: col.reformat(width=cwidths[ix], **options) except Exception: raise # equalize heights for each row (we must do this here, since it may have changed to fit new # widths) cheights = [ max(cell.get_height() for cell in (col[iy] for col in self.worktable)) for iy in range(nrowmax) ] if self.height: # if we are fixing the table height, it means cells must crop text instead of resizing. if nrowmax: # get minimum possible cell heights for each column cheights_min = [ max(cell.get_min_height() for cell in (col[iy] for col in self.worktable)) for iy in range(nrowmax) ] chmin = sum(cheights_min) # get which cols have separately set heights - these should be locked # note that we need to remove cheights_min for each lock to avoid counting # it twice (in chmin and in locked_cols) locked_cols = { icol: col.options["height"] - cheights_min[icol] for icol, col in enumerate(self.worktable) if "height" in col.options } locked_height = sum(locked_cols.values()) excess = self.height - chmin - locked_height if chmin > self.height: # we cannot shrink any more raise Exception( "Cannot shrink table height to %s. Minimum " "size (and/or fixed-height rows) sets minimum at %s." % (self.height, chmin + locked_height) ) # Add all the excess at the end of the table # Note: Older solutions tried to balance individual # rows' vsize. This could lead to empty rows that # looked like a bug. This solution instead # adds empty rows at the end which is less sophisticated # but much more visually consistent. cheights_min[-1] += excess cheights = cheights_min # we must tell cells to crop instead of expanding options["enforce_size"] = True # reformat table (for vertical align) for ix, col in enumerate(self.worktable): for iy, cell in enumerate(col): try: col.reformat_cell(iy, height=cheights[iy], **options) except Exception as e: msg = "ix=%s, iy=%s, height=%s: %s" % (ix, iy, cheights[iy], e.message) raise Exception("Error in vertical align:\n %s" % msg) # calculate actual table width/height in characters self.cwidth = sum(cwidths) self.cheight = sum(cheights) def _generate_lines(self): """ Generates lines across all columns (each cell may contain multiple lines) This will also balance the table. """ self._balance() for iy in range(self.nrows): cell_row = [col[iy] for col in self.worktable] # this produces a list of lists, each of equal length cell_data = [cell.get() for cell in cell_row] cell_height = min(len(lines) for lines in cell_data) for iline in range(cell_height): yield ANSIString("").join(_to_ansi(celldata[iline] for celldata in cell_data))
[docs] def add_header(self, *args, **kwargs): """ Add header to table. This is a number of texts to be put at the top of the table. They will replace an existing header. Args: args (str): These strings will be used as the header texts. Keyword Args: Same keywords as per `EvTable.__init__`. Will be applied to the new header's cells. """ self.header = True self.add_row(ypos=0, *args, **kwargs)
[docs] def add_column(self, *args, **kwargs): """ Add a column to table. If there are more rows in new column than there are rows in the current table, the table will expand with empty rows in the other columns. If too few, the new column with get new empty rows. All filling rows are added to the end. Args: args (`EvColumn` or multiple strings): Either a single EvColumn instance or a number of data string arguments to be used to create a new column. header (str, optional): The header text for the column xpos (int, optional): Index position in table *before* which to input new column. If not given, column will be added to the end of the table. Uses Python indexing (so first column is `xpos=0`) Keyword Args: Other keywords as per `Cell.__init__`. """ # this will replace default options with new ones without changing default options = dict(list(self.options.items()) + list(kwargs.items())) xpos = kwargs.get("xpos", None) column = EvColumn(*args, **options) wtable = self.ncols htable = self.nrows header = kwargs.get("header", None) if header: column.add_rows(str(header), ypos=0, **options) self.header = True elif self.header: # we have a header already. Offset column.add_rows("", ypos=0, **options) # Calculate whether the new column needs to expand to the # current table size, or if the table needs to expand to # the column size. # This needs to happen after the header rows have already been # added to the column in order for the size calculations to match. excess = len(column) - htable if excess > 0: # we need to add new rows to table for col in self.table: empty_rows = ["" for _ in range(excess)] col.add_rows(*empty_rows, **options) self.nrows += excess elif excess < 0: # we need to add new rows to new column empty_rows = ["" for _ in range(abs(excess))] column.add_rows(*empty_rows, **options) self.nrows -= excess if xpos is None or xpos > wtable - 1: # add to the end self.table.append(column) else: # insert column xpos = min(wtable - 1, max(0, int(xpos))) self.table.insert(xpos, column) self.ncols += 1
# self._balance()
[docs] def add_row(self, *args, **kwargs): """ Add a row to table (not a header). If there are more cells in the given row than there are cells in the current table the table will be expanded with empty columns to match. These will be added to the end of the table. In the same way, adding a line with too few cells will lead to the last ones getting padded. Args: args (str): Any number of string argumnets to use as the data in the row (one cell per argument). ypos (int, optional): Index position in table before which to input new row. If not given, will be added to the end of the table. Uses Python indexing (so first row is `ypos=0`) Keyword Args: Other keywords are as per `EvCell.__init__`. """ # this will replace default options with new ones without changing default row = list(args) options = dict(list(self.options.items()) + list(kwargs.items())) ypos = kwargs.get("ypos", None) wtable = self.ncols htable = self.nrows excess = len(row) - wtable if excess > 0: # we need to add new empty columns to table empty_rows = ["" for _ in range(htable)] self.table.extend([EvColumn(*empty_rows, **options) for _ in range(excess)]) self.ncols += excess elif excess < 0: # we need to add more cells to row row.extend(["" for _ in range(abs(excess))]) self.ncols -= excess if ypos is None or ypos > htable - 1: # add new row to the end for icol, col in enumerate(self.table): col.add_rows(row[icol], **options) else: # insert row elsewhere ypos = min(htable - 1, max(0, int(ypos))) for icol, col in enumerate(self.table): col.add_rows(row[icol], ypos=ypos, **options) self.nrows += 1
# self._balance()
[docs] def reformat(self, **kwargs): """ Force a re-shape of the entire table. Keyword Args: Table options as per `EvTable.__init__`. """ self.width = kwargs.pop("width", self.width) self.height = kwargs.pop("height", self.height) for key, value in kwargs.items(): setattr(self, key, value) hchar = kwargs.pop("header_line_char", self.header_line_char) # border settings are also passed on into EvCells (so kwargs.get, not kwargs.pop) self.header_line_char = hchar[0] if hchar else self.header_line_char self.border_width = kwargs.get("border_width", self.border_width) self.corner_char = kwargs.get("corner_char", self.corner_char) self.header_line_char = kwargs.get("header_line_char", self.header_line_char) self.corner_top_left_char = _to_ansi(kwargs.pop("corner_top_left_char", self.corner_char)) self.corner_top_right_char = _to_ansi(kwargs.pop("corner_top_right_char", self.corner_char)) self.corner_bottom_left_char = _to_ansi( kwargs.pop("corner_bottom_left_char", self.corner_char) ) self.corner_bottom_right_char = _to_ansi( kwargs.pop("corner_bottom_right_char", self.corner_char) ) self.options.update(kwargs)
[docs] def reformat_column(self, index, **kwargs): """ Sends custom options to a specific column in the table. Args: index (int): Which column to reformat. The column index is given from 0 to Ncolumns-1. Keyword Args: Column options as per `EvCell.__init__`. Raises: Exception: if an invalid index is found. """ if index > len(self.table): raise Exception("Not a valid column index") # we update the columns' options which means eventual width/height # will be 'locked in' and withstand auto-balancing width/height from the table later self.table[index].options.update(kwargs) self.table[index].reformat(**kwargs)
[docs] def get(self): """ Return lines of table as a list. Returns: table_lines (list): The lines of the table, in order. """ return [line for line in self._generate_lines()]
def __str__(self): """print table (this also balances it)""" # h = "12345678901234567890123456789012345678901234567890123456789012345678901234567890" return str(str(ANSIString("\n").join([line for line in self._generate_lines()])))
def _test(): """Test""" table = EvTable( "|yHeading1|n", "|gHeading2|n", table=[[1, 2, 3], [4, 5, 6], [7, 8, 9]], border="cells", align="l", ) table.add_column("|rThis is long data|n", "|bThis is even longer data|n") table.add_row("This is a single row") print(str(table)) table.reformat(width=50) print(str(table)) table.reformat_column(3, width=30, align="r") print(str(table)) return table def _test2(): table = EvTable("|yHeading1|n", "|B|[GHeading2|n", "Heading3") for i in range(100): table.add_row( "This is col 0, row %i" % i, "|gThis is col 1, row |w%i|n|g.|n" % i, "This is col 2, row %i" % i, ) return table