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authorMarkus Heiser <markus.heiser@darmarIT.de>2016-06-30 14:00:22 +0200
committerJonathan Corbet <corbet@lwn.net>2016-06-30 12:58:33 -0600
commit0249a764485744b3f5babb02ced0fe6c199d89f7 (patch)
treead2dfeccdf3854119df6e00692190e4d698bb1cf /Documentation/sphinx
parent17defc282fe6e6ac93edbad8873ce89ef86b2490 (diff)
downloadlinux-0249a764485744b3f5babb02ced0fe6c199d89f7.tar.bz2
doc-rst: flat-table directive - initial implementation
Implements the reST flat-table directive. The ``flat-table`` is a double-stage list similar to the ``list-table`` with some additional features: * column-span: with the role ``cspan`` a cell can be extended through additional columns * row-span: with the role ``rspan`` a cell can be extended through additional rows * auto span rightmost cell of a table row over the missing cells on the right side of that table-row. With Option ``:fill-cells:`` this behavior can changed from *auto span* to *auto fill*, which automaticly inserts (empty) list tables The *list tables* formats are double stage lists. Compared to the ASCII-art they migth be less comfortable for readers of the text-files. Their advantage is, that they are easy to create/modify and that the diff of a modification is much more meaningfull, because it is limited to the modified content. The initial implementation was taken from the sphkerneldoc project [1] [1] https://github.com/return42/sphkerneldoc/commits/master/scripts/site-python/linuxdoc/rstFlatTable.py Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> [jc: fixed typos and misspellings in the docs] Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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+#!/usr/bin/env python3
+# -*- coding: utf-8; mode: python -*-
+# pylint: disable=C0330, R0903, R0912
+
+u"""
+ flat-table
+ ~~~~~~~~~~
+
+ Implementation of the ``flat-table`` reST-directive.
+
+ :copyright: Copyright (C) 2016 Markus Heiser
+ :license: GPL Version 2, June 1991 see linux/COPYING for details.
+
+ The ``flat-table`` (:py:class:`FlatTable`) is a double-stage list similar to
+ the ``list-table`` with some additional features:
+
+ * *column-span*: with the role ``cspan`` a cell can be extended through
+ additional columns
+
+ * *row-span*: with the role ``rspan`` a cell can be extended through
+ additional rows
+
+ * *auto span* rightmost cell of a table row over the missing cells on the
+ right side of that table-row. With Option ``:fill-cells:`` this behavior
+ can changed from *auto span* to *auto fill*, which automaticly inserts
+ (empty) cells instead of spanning the last cell.
+
+ Options:
+
+ * header-rows: [int] count of header rows
+ * stub-columns: [int] count of stub columns
+ * widths: [[int] [int] ... ] widths of columns
+ * fill-cells: instead of autospann missing cells, insert missing cells
+
+ roles:
+
+ * cspan: [int] additionale columns (*morecols*)
+ * rspan: [int] additionale rows (*morerows*)
+"""
+
+# ==============================================================================
+# imports
+# ==============================================================================
+
+import sys
+
+from docutils import nodes
+from docutils.parsers.rst import directives, roles
+from docutils.parsers.rst.directives.tables import Table
+from docutils.utils import SystemMessagePropagation
+
+# ==============================================================================
+# common globals
+# ==============================================================================
+
+# The version numbering follows numbering of the specification
+# (Documentation/books/kernel-doc-HOWTO).
+__version__ = '1.0'
+
+PY3 = sys.version_info[0] == 3
+PY2 = sys.version_info[0] == 2
+
+if PY3:
+ # pylint: disable=C0103, W0622
+ unicode = str
+ basestring = str
+
+# ==============================================================================
+def setup(app):
+# ==============================================================================
+
+ app.add_directive("flat-table", FlatTable)
+ roles.register_local_role('cspan', c_span)
+ roles.register_local_role('rspan', r_span)
+
+# ==============================================================================
+def c_span(name, rawtext, text, lineno, inliner, options=None, content=None):
+# ==============================================================================
+ # pylint: disable=W0613
+
+ options = options if options is not None else {}
+ content = content if content is not None else []
+ nodelist = [colSpan(span=int(text))]
+ msglist = []
+ return nodelist, msglist
+
+# ==============================================================================
+def r_span(name, rawtext, text, lineno, inliner, options=None, content=None):
+# ==============================================================================
+ # pylint: disable=W0613
+
+ options = options if options is not None else {}
+ content = content if content is not None else []
+ nodelist = [rowSpan(span=int(text))]
+ msglist = []
+ return nodelist, msglist
+
+
+# ==============================================================================
+class rowSpan(nodes.General, nodes.Element): pass # pylint: disable=C0103,C0321
+class colSpan(nodes.General, nodes.Element): pass # pylint: disable=C0103,C0321
+# ==============================================================================
+
+# ==============================================================================
+class FlatTable(Table):
+# ==============================================================================
+
+ u"""FlatTable (``flat-table``) directive"""
+
+ option_spec = {
+ 'name': directives.unchanged
+ , 'class': directives.class_option
+ , 'header-rows': directives.nonnegative_int
+ , 'stub-columns': directives.nonnegative_int
+ , 'widths': directives.positive_int_list
+ , 'fill-cells' : directives.flag }
+
+ def run(self):
+
+ if not self.content:
+ error = self.state_machine.reporter.error(
+ 'The "%s" directive is empty; content required.' % self.name,
+ nodes.literal_block(self.block_text, self.block_text),
+ line=self.lineno)
+ return [error]
+
+ title, messages = self.make_title()
+ node = nodes.Element() # anonymous container for parsing
+ self.state.nested_parse(self.content, self.content_offset, node)
+
+ tableBuilder = ListTableBuilder(self)
+ tableBuilder.parseFlatTableNode(node)
+ tableNode = tableBuilder.buildTableNode()
+ # SDK.CONSOLE() # print --> tableNode.asdom().toprettyxml()
+ if title:
+ tableNode.insert(0, title)
+ return [tableNode] + messages
+
+
+# ==============================================================================
+class ListTableBuilder(object):
+# ==============================================================================
+
+ u"""Builds a table from a double-stage list"""
+
+ def __init__(self, directive):
+ self.directive = directive
+ self.rows = []
+ self.max_cols = 0
+
+ def buildTableNode(self):
+
+ colwidths = self.directive.get_column_widths(self.max_cols)
+ stub_columns = self.directive.options.get('stub-columns', 0)
+ header_rows = self.directive.options.get('header-rows', 0)
+
+ table = nodes.table()
+ tgroup = nodes.tgroup(cols=len(colwidths))
+ table += tgroup
+
+
+ for colwidth in colwidths:
+ colspec = nodes.colspec(colwidth=colwidth)
+ # FIXME: It seems, that the stub method only works well in the
+ # absence of rowspan (observed by the html buidler, the docutils-xml
+ # build seems OK). This is not extraordinary, because there exists
+ # no table directive (except *this* flat-table) which allows to
+ # define coexistent of rowspan and stubs (there was no use-case
+ # before flat-table). This should be reviewed (later).
+ if stub_columns:
+ colspec.attributes['stub'] = 1
+ stub_columns -= 1
+ tgroup += colspec
+ stub_columns = self.directive.options.get('stub-columns', 0)
+
+ if header_rows:
+ thead = nodes.thead()
+ tgroup += thead
+ for row in self.rows[:header_rows]:
+ thead += self.buildTableRowNode(row)
+
+ tbody = nodes.tbody()
+ tgroup += tbody
+
+ for row in self.rows[header_rows:]:
+ tbody += self.buildTableRowNode(row)
+ return table
+
+ def buildTableRowNode(self, row_data, classes=None):
+ classes = [] if classes is None else classes
+ row = nodes.row()
+ for cell in row_data:
+ if cell is None:
+ continue
+ cspan, rspan, cellElements = cell
+
+ attributes = {"classes" : classes}
+ if rspan:
+ attributes['morerows'] = rspan
+ if cspan:
+ attributes['morecols'] = cspan
+ entry = nodes.entry(**attributes)
+ entry.extend(cellElements)
+ row += entry
+ return row
+
+ def raiseError(self, msg):
+ error = self.directive.state_machine.reporter.error(
+ msg
+ , nodes.literal_block(self.directive.block_text
+ , self.directive.block_text)
+ , line = self.directive.lineno )
+ raise SystemMessagePropagation(error)
+
+ def parseFlatTableNode(self, node):
+ u"""parses the node from a :py:class:`FlatTable` directive's body"""
+
+ if len(node) != 1 or not isinstance(node[0], nodes.bullet_list):
+ self.raiseError(
+ 'Error parsing content block for the "%s" directive: '
+ 'exactly one bullet list expected.' % self.directive.name )
+
+ for rowNum, rowItem in enumerate(node[0]):
+ row = self.parseRowItem(rowItem, rowNum)
+ self.rows.append(row)
+ self.roundOffTableDefinition()
+
+ def roundOffTableDefinition(self):
+ u"""Round off the table definition.
+
+ This method rounds off the table definition in :py:member:`rows`.
+
+ * This method inserts the needed ``None`` values for the missing cells
+ arising from spanning cells over rows and/or columns.
+
+ * recount the :py:member:`max_cols`
+
+ * Autospan or fill (option ``fill-cells``) missing cells on the right
+ side of the table-row
+ """
+
+ y = 0
+ while y < len(self.rows):
+ x = 0
+
+ while x < len(self.rows[y]):
+ cell = self.rows[y][x]
+ if cell is None:
+ x += 1
+ continue
+ cspan, rspan = cell[:2]
+ # handle colspan in current row
+ for c in range(cspan):
+ try:
+ self.rows[y].insert(x+c+1, None)
+ except: # pylint: disable=W0702
+ # the user sets ambiguous rowspans
+ pass # SDK.CONSOLE()
+ # handle colspan in spanned rows
+ for r in range(rspan):
+ for c in range(cspan + 1):
+ try:
+ self.rows[y+r+1].insert(x+c, None)
+ except: # pylint: disable=W0702
+ # the user sets ambiguous rowspans
+ pass # SDK.CONSOLE()
+ x += 1
+ y += 1
+
+ # Insert the missing cells on the right side. For this, first
+ # re-calculate the max columns.
+
+ for row in self.rows:
+ if self.max_cols < len(row):
+ self.max_cols = len(row)
+
+ # fill with empty cells or cellspan?
+
+ fill_cells = False
+ if 'fill-cells' in self.directive.options:
+ fill_cells = True
+
+ for row in self.rows:
+ x = self.max_cols - len(row)
+ if x and not fill_cells:
+ if row[-1] is None:
+ row.append( ( x - 1, 0, []) )
+ else:
+ cspan, rspan, content = row[-1]
+ row[-1] = (cspan + x, rspan, content)
+ elif x and fill_cells:
+ for i in range(x):
+ row.append( (0, 0, nodes.comment()) )
+
+ def pprint(self):
+ # for debugging
+ retVal = "[ "
+ for row in self.rows:
+ retVal += "[ "
+ for col in row:
+ if col is None:
+ retVal += ('%r' % col)
+ retVal += "\n , "
+ else:
+ content = col[2][0].astext()
+ if len (content) > 30:
+ content = content[:30] + "..."
+ retVal += ('(cspan=%s, rspan=%s, %r)'
+ % (col[0], col[1], content))
+ retVal += "]\n , "
+ retVal = retVal[:-2]
+ retVal += "]\n , "
+ retVal = retVal[:-2]
+ return retVal + "]"
+
+ def parseRowItem(self, rowItem, rowNum):
+ row = []
+ childNo = 0
+ error = False
+ cell = None
+ target = None
+
+ for child in rowItem:
+ if (isinstance(child , nodes.comment)
+ or isinstance(child, nodes.system_message)):
+ pass
+ elif isinstance(child , nodes.target):
+ target = child
+ elif isinstance(child, nodes.bullet_list):
+ childNo += 1
+ cell = child
+ else:
+ error = True
+ break
+
+ if childNo != 1 or error:
+ self.raiseError(
+ 'Error parsing content block for the "%s" directive: '
+ 'two-level bullet list expected, but row %s does not '
+ 'contain a second-level bullet list.'
+ % (self.directive.name, rowNum + 1))
+
+ for cellItem in cell:
+ cspan, rspan, cellElements = self.parseCellItem(cellItem)
+ if target is not None:
+ cellElements.insert(0, target)
+ row.append( (cspan, rspan, cellElements) )
+ return row
+
+ def parseCellItem(self, cellItem):
+ # search and remove cspan, rspan colspec from the first element in
+ # this listItem (field).
+ cspan = rspan = 0
+ if not len(cellItem):
+ return cspan, rspan, []
+ for elem in cellItem[0]:
+ if isinstance(elem, colSpan):
+ cspan = elem.get("span")
+ elem.parent.remove(elem)
+ continue
+ if isinstance(elem, rowSpan):
+ rspan = elem.get("span")
+ elem.parent.remove(elem)
+ continue
+ return cspan, rspan, cellItem[:]