Documentation/sphinx/rstFlatTable.py

   1 #!/usr/bin/env python3
   2 # -*- coding: utf-8; mode: python -*-
   3 # pylint: disable=C0330, R0903, R0912
   4
   5 u"""
   6     flat-table
   7     ~~~~~~~~~~
   8
   9     Implementation of the ``flat-table`` reST-directive.
  10
  11     :copyright:  Copyright (C) 2016  Markus Heiser
  12     :license:    GPL Version 2, June 1991 see linux/COPYING for details.
  13
  14     The ``flat-table`` (:py:class:`FlatTable`) is a double-stage list similar to
  15     the ``list-table`` with some additional features:
  16
  17     * *column-span*: with the role ``cspan`` a cell can be extended through
  18       additional columns
  19
  20     * *row-span*: with the role ``rspan`` a cell can be extended through
  21       additional rows
  22
  23     * *auto span* rightmost cell of a table row over the missing cells on the
  24       right side of that table-row.  With Option ``:fill-cells:`` this behavior
  25       can be changed from *auto span* to *auto fill*, which automatically inserts
  26       (empty) cells instead of spanning the last cell.
  27
  28     Options:
  29
  30     * header-rows:   [int] count of header rows
  31     * stub-columns:  [int] count of stub columns
  32     * widths:        [[int] [int] ... ] widths of columns
  33     * fill-cells:    instead of autospann missing cells, insert missing cells
  34
  35     roles:
  36
  37     * cspan: [int] additionale columns (*morecols*)
  38     * rspan: [int] additionale rows (*morerows*)
  39 """
  40
  41 # ==============================================================================
  42 # imports
  43 # ==============================================================================
  44
  45 from docutils import nodes
  46 from docutils.parsers.rst import directives, roles
  47 from docutils.parsers.rst.directives.tables import Table
  48 from docutils.utils import SystemMessagePropagation
  49
  50 # ==============================================================================
  51 # common globals
  52 # ==============================================================================
  53
  54 __version__  = '1.0'
  55
  56 # ==============================================================================
  57 def setup(app):
  58 # ==============================================================================
  59
  60     app.add_directive("flat-table", FlatTable)
  61     roles.register_local_role('cspan', c_span)
  62     roles.register_local_role('rspan', r_span)
  63
  64     return dict(
  65         version = __version__,
  66         parallel_read_safe = True,
  67         parallel_write_safe = True
  68     )
  69
  70 # ==============================================================================
  71 def c_span(name, rawtext, text, lineno, inliner, options=None, content=None):
  72 # ==============================================================================
  73     # pylint: disable=W0613
  74
  75     options  = options if options is not None else {}
  76     content  = content if content is not None else []
  77     nodelist = [colSpan(span=int(text))]
  78     msglist  = []
  79     return nodelist, msglist
  80
  81 # ==============================================================================
  82 def r_span(name, rawtext, text, lineno, inliner, options=None, content=None):
  83 # ==============================================================================
  84     # pylint: disable=W0613
  85
  86     options  = options if options is not None else {}
  87     content  = content if content is not None else []
  88     nodelist = [rowSpan(span=int(text))]
  89     msglist  = []
  90     return nodelist, msglist
  91
  92
  93 # ==============================================================================
  94 class rowSpan(nodes.General, nodes.Element): pass # pylint: disable=C0103,C0321
  95 class colSpan(nodes.General, nodes.Element): pass # pylint: disable=C0103,C0321
  96 # ==============================================================================
  97
  98 # ==============================================================================
  99 class FlatTable(Table):
 100 # ==============================================================================
 101
 102     u"""FlatTable (``flat-table``) directive"""
 103
 104     option_spec = {
 105         'name': directives.unchanged
 106         , 'class': directives.class_option
 107         , 'header-rows': directives.nonnegative_int
 108         , 'stub-columns': directives.nonnegative_int
 109         , 'widths': directives.positive_int_list
 110         , 'fill-cells' : directives.flag }
 111
 112     def run(self):
 113
 114         if not self.content:
 115             error = self.state_machine.reporter.error(
 116                 'The "%s" directive is empty; content required.' % self.name,
 117                 nodes.literal_block(self.block_text, self.block_text),
 118                 line=self.lineno)
 119             return [error]
 120
 121         title, messages = self.make_title()
 122         node = nodes.Element()          # anonymous container for parsing
 123         self.state.nested_parse(self.content, self.content_offset, node)
 124
 125         tableBuilder = ListTableBuilder(self)
 126         tableBuilder.parseFlatTableNode(node)
 127         tableNode = tableBuilder.buildTableNode()
 128         # SDK.CONSOLE()  # print --> tableNode.asdom().toprettyxml()
 129         if title:
 130             tableNode.insert(0, title)
 131         return [tableNode] + messages
 132
 133
 134 # ==============================================================================
 135 class ListTableBuilder(object):
 136 # ==============================================================================
 137
 138     u"""Builds a table from a double-stage list"""
 139
 140     def __init__(self, directive):
 141         self.directive = directive
 142         self.rows      = []
 143         self.max_cols  = 0
 144
 145     def buildTableNode(self):
 146
 147         colwidths    = self.directive.get_column_widths(self.max_cols)
 148         if isinstance(colwidths, tuple):
 149             # Since docutils 0.13, get_column_widths returns a (widths,
 150             # colwidths) tuple, where widths is a string (i.e. 'auto').
 151             # See https://sourceforge.net/p/docutils/patches/120/.
 152             colwidths = colwidths[1]
 153         stub_columns = self.directive.options.get('stub-columns', 0)
 154         header_rows  = self.directive.options.get('header-rows', 0)
 155
 156         table = nodes.table()
 157         tgroup = nodes.tgroup(cols=len(colwidths))
 158         table += tgroup
 159
 160
 161         for colwidth in colwidths:
 162             colspec = nodes.colspec(colwidth=colwidth)
 163             # FIXME: It seems, that the stub method only works well in the
 164             # absence of rowspan (observed by the html builder, the docutils-xml
 165             # build seems OK).  This is not extraordinary, because there exists
 166             # no table directive (except *this* flat-table) which allows to
 167             # define coexistent of rowspan and stubs (there was no use-case
 168             # before flat-table). This should be reviewed (later).
 169             if stub_columns:
 170                 colspec.attributes['stub'] = 1
 171                 stub_columns -= 1
 172             tgroup += colspec
 173         stub_columns = self.directive.options.get('stub-columns', 0)
 174
 175         if header_rows:
 176             thead = nodes.thead()
 177             tgroup += thead
 178             for row in self.rows[:header_rows]:
 179                 thead += self.buildTableRowNode(row)
 180
 181         tbody = nodes.tbody()
 182         tgroup += tbody
 183
 184         for row in self.rows[header_rows:]:
 185             tbody += self.buildTableRowNode(row)
 186         return table
 187
 188     def buildTableRowNode(self, row_data, classes=None):
 189         classes = [] if classes is None else classes
 190         row = nodes.row()
 191         for cell in row_data:
 192             if cell is None:
 193                 continue
 194             cspan, rspan, cellElements = cell
 195
 196             attributes = {"classes" : classes}
 197             if rspan:
 198                 attributes['morerows'] = rspan
 199             if cspan:
 200                 attributes['morecols'] = cspan
 201             entry = nodes.entry(**attributes)
 202             entry.extend(cellElements)
 203             row += entry
 204         return row
 205
 206     def raiseError(self, msg):
 207         error =  self.directive.state_machine.reporter.error(
 208             msg
 209             , nodes.literal_block(self.directive.block_text
 210                                   , self.directive.block_text)
 211             , line = self.directive.lineno )
 212         raise SystemMessagePropagation(error)
 213
 214     def parseFlatTableNode(self, node):
 215         u"""parses the node from a :py:class:`FlatTable` directive's body"""
 216
 217         if len(node) != 1 or not isinstance(node[0], nodes.bullet_list):
 218             self.raiseError(
 219                 'Error parsing content block for the "%s" directive: '
 220                 'exactly one bullet list expected.' % self.directive.name )
 221
 222         for rowNum, rowItem in enumerate(node[0]):
 223             row = self.parseRowItem(rowItem, rowNum)
 224             self.rows.append(row)
 225         self.roundOffTableDefinition()
 226
 227     def roundOffTableDefinition(self):
 228         u"""Round off the table definition.
 229
 230         This method rounds off the table definition in :py:member:`rows`.
 231
 232         * This method inserts the needed ``None`` values for the missing cells
 233         arising from spanning cells over rows and/or columns.
 234
 235         * recount the :py:member:`max_cols`
 236
 237         * Autospan or fill (option ``fill-cells``) missing cells on the right
 238           side of the table-row
 239         """
 240
 241         y = 0
 242         while y < len(self.rows):
 243             x = 0
 244
 245             while x < len(self.rows[y]):
 246                 cell = self.rows[y][x]
 247                 if cell is None:
 248                     x += 1
 249                     continue
 250                 cspan, rspan = cell[:2]
 251                 # handle colspan in current row
 252                 for c in range(cspan):
 253                     try:
 254                         self.rows[y].insert(x+c+1, None)
 255                     except: # pylint: disable=W0702
 256                         # the user sets ambiguous rowspans
 257                         pass # SDK.CONSOLE()
 258                 # handle colspan in spanned rows
 259                 for r in range(rspan):
 260                     for c in range(cspan + 1):
 261                         try:
 262                             self.rows[y+r+1].insert(x+c, None)
 263                         except: # pylint: disable=W0702
 264                             # the user sets ambiguous rowspans
 265                             pass # SDK.CONSOLE()
 266                 x += 1
 267             y += 1
 268
 269         # Insert the missing cells on the right side. For this, first
 270         # re-calculate the max columns.
 271
 272         for row in self.rows:
 273             if self.max_cols < len(row):
 274                 self.max_cols = len(row)
 275
 276         # fill with empty cells or cellspan?
 277
 278         fill_cells = False
 279         if 'fill-cells' in self.directive.options:
 280             fill_cells = True
 281
 282         for row in self.rows:
 283             x =  self.max_cols - len(row)
 284             if x and not fill_cells:
 285                 if row[-1] is None:
 286                     row.append( ( x - 1, 0, []) )
 287                 else:
 288                     cspan, rspan, content = row[-1]
 289                     row[-1] = (cspan + x, rspan, content)
 290             elif x and fill_cells:
 291                 for i in range(x):
 292                     row.append( (0, 0, nodes.comment()) )
 293
 294     def pprint(self):
 295         # for debugging
 296         retVal = "[   "
 297         for row in self.rows:
 298             retVal += "[ "
 299             for col in row:
 300                 if col is None:
 301                     retVal += ('%r' % col)
 302                     retVal += "\n    , "
 303                 else:
 304                     content = col[2][0].astext()
 305                     if len (content) > 30:
 306                         content = content[:30] + "..."
 307                     retVal += ('(cspan=%s, rspan=%s, %r)'
 308                                % (col[0], col[1], content))
 309                     retVal += "]\n    , "
 310             retVal = retVal[:-2]
 311             retVal += "]\n  , "
 312         retVal = retVal[:-2]
 313         return retVal + "]"
 314
 315     def parseRowItem(self, rowItem, rowNum):
 316         row = []
 317         childNo = 0
 318         error   = False
 319         cell    = None
 320         target  = None
 321
 322         for child in rowItem:
 323             if (isinstance(child , nodes.comment)
 324                 or isinstance(child, nodes.system_message)):
 325                 pass
 326             elif isinstance(child , nodes.target):
 327                 target = child
 328             elif isinstance(child, nodes.bullet_list):
 329                 childNo += 1
 330                 cell = child
 331             else:
 332                 error = True
 333                 break
 334
 335         if childNo != 1 or error:
 336             self.raiseError(
 337                 'Error parsing content block for the "%s" directive: '
 338                 'two-level bullet list expected, but row %s does not '
 339                 'contain a second-level bullet list.'
 340                 % (self.directive.name, rowNum + 1))
 341
 342         for cellItem in cell:
 343             cspan, rspan, cellElements = self.parseCellItem(cellItem)
 344             if target is not None:
 345                 cellElements.insert(0, target)
 346             row.append( (cspan, rspan, cellElements) )
 347         return row
 348
 349     def parseCellItem(self, cellItem):
 350         # search and remove cspan, rspan colspec from the first element in
 351         # this listItem (field).
 352         cspan = rspan = 0
 353         if not len(cellItem):
 354             return cspan, rspan, []
 355         for elem in cellItem[0]:
 356             if isinstance(elem, colSpan):
 357                 cspan = elem.get("span")
 358                 elem.parent.remove(elem)
 359                 continue
 360             if isinstance(elem, rowSpan):
 361                 rspan = elem.get("span")
 362                 elem.parent.remove(elem)
 363                 continue
 364         return cspan, rspan, cellItem[:]