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class TableBase(object):
def __init__(self):
self.headers = []
self.rows = []
def set_header(self, header):
assert len(header) > 0
self.headers = [self.normalize(header)]
def add_row(self, row):
assert len(row) > 0
self.rows.append(self.normalize(row))
def normalize(self, row):
tmp = []
for text, count in self.iter_spans(row):
assert count >= 1
if count == 1:
tmp.append(text)
else:
tmp.append((text, count))
return tmp
def is_raw(self, row):
return all(isinstance(val, str) for val in row)
def iter_spans(self, row):
for item in row:
if type(item) is tuple:
text = item[0]
count = item[1]
else:
text = item
count = 1
yield (text, count)
class TableValidator(object):
def __init__(self, table):
self.table = table
self.columns = self.get_table_columns_count()
if self.columns is None:
raise ValueError("Table doesn't have header which define column layout")
self.validate()
def get_table_columns_count(self):
# only from headers
for header in self.table.headers:
if self.table.is_raw(header):
return len(header)
def validate(self):
for i, header in enumerate(self.table.headers):
n = self.get_columns_count(header)
if n != self.columns:
raise ValueError("header #%d has %d column(s), expected %d: %s" % (i, n, self.columns, header))
for i, row in enumerate(self.table.rows):
n = self.get_columns_count(row)
if n != self.columns:
raise ValueError("row #%d has %d column(s), expected %d: %s" % (i, n, self.columns, row))
def get_columns_count(self, row):
n = 0
for _, count in self.table.iter_spans(row):
n += count
return n
ALIGN_RIGHT = '>'
ALIGN_LEFT = '<'
CENTER = '^'
class MarkdownTableRenderer(object):
def __init__(self, table):
if len(table.headers) > 1:
raise ValueError("Markdown does not support multiple header rows")
self.validator = TableValidator(table)
self.table = table
self.padding = 1
self.widths = self._calculate_widths()
def get_headers(self):
return self.table.headers
def get_rows(self):
return self.table.rows
def _calculate_widths(self):
width = [0] * self.validator.columns
# get width from fixed
for row in self.get_headers() + self.get_rows():
index = 0
for text, count in self.table.iter_spans(row):
w = len(text)
width[index] = max(w, width[index])
index += 1
return width
def _get_columns_width(self, start, count):
assert count >= 1
w = 0
for index in range(start, start + count):
w += self.widths[index]
w += 2 * self.padding
w += (count - 1) # for the columns spacing '|'
return w
def _render_separator(self, row, fill):
assert len(fill) == 1
result = '|'
index = 0
for text, count in self.table.iter_spans(row):
result += ' '
result += fill * (self._get_columns_width(index, count) - 2)
result += ' '
result += '|'
index += count
return result
def _render_row(self, row, align=None):
if align is not None:
def get_align(text):
return align
else:
def get_align(text):
if is_float_or_int(text):
return ALIGN_RIGHT
else:
return ALIGN_LEFT
result = '|'
index = 0
for text, count in self.table.iter_spans(row):
width = self._get_columns_width(index, count)
width -= 2 * self.padding
result += ' ' * self.padding
result += u'{:{align}{width}}'.format(text, align=get_align(text), width=width)
result += ' ' * self.padding
result += '|'
index += count
return result
def get_image(self):
lines = []
if self.table.headers:
header = self.table.headers[0]
lines.append(self._render_row(header, CENTER))
lines.append(self._render_separator(header, '-'))
for row in self.get_rows():
lines.append(self._render_row(row))
return '\n'.join(lines)
class Table(TableBase):
def __unicode__(self):
renderer = MarkdownTableRenderer(self)
return renderer.get_image()
def __str__(self):
renderer = MarkdownTableRenderer(self)
return renderer.get_image()
def is_float_or_int(text):
try:
float(text)
return True
except ValueError:
return False
if __name__ == '__main__':
table = Table()
table.set_header(["procedure", "size", "time"])
table.add_row(["foo", "100", "0.5"])
table.add_row(["bar", "105", "1.5"])
table.add_row(["baz", "111", "0.2"])
print(table)
table2 = Table()
table2.set_header(["size1", "size2", "proc1", "proc2", "proc3"])
table2.add_row(["1", "2", "a", "b", "c"])
table2.add_row(["9", "3", "A", "B", "C"])
table2.add_row(["42", "-", ("N/A", 3)])
print()
print(table2)
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