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Diffstat (limited to 'docs/sphinx/hxtool.py')
| -rw-r--r-- | docs/sphinx/hxtool.py | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/docs/sphinx/hxtool.py b/docs/sphinx/hxtool.py new file mode 100644 index 0000000..5d6736f --- /dev/null +++ b/docs/sphinx/hxtool.py @@ -0,0 +1,210 @@ +# coding=utf-8 +# +# QEMU hxtool .hx file parsing extension +# +# Copyright (c) 2020 Linaro +# +# This work is licensed under the terms of the GNU GPLv2 or later. +# See the COPYING file in the top-level directory. +"""hxtool is a Sphinx extension that implements the hxtool-doc directive""" + +# The purpose of this extension is to read fragments of rST +# from .hx files, and insert them all into the current document. +# The rST fragments are delimited by SRST/ERST lines. +# The conf.py file must set the hxtool_srctree config value to +# the root of the QEMU source tree. +# Each hxtool-doc:: directive takes one argument which is the +# path of the .hx file to process, relative to the source tree. + +import os +import re +from enum import Enum + +from docutils import nodes +from docutils.statemachine import ViewList +from docutils.parsers.rst import directives, Directive +from sphinx.errors import ExtensionError +from sphinx.util.nodes import nested_parse_with_titles +import sphinx + +# Sphinx up to 1.6 uses AutodocReporter; 1.7 and later +# use switch_source_input. Check borrowed from kerneldoc.py. +Use_SSI = sphinx.__version__[:3] >= '1.7' +if Use_SSI: + from sphinx.util.docutils import switch_source_input +else: + from sphinx.ext.autodoc import AutodocReporter + +__version__ = '1.0' + +# We parse hx files with a state machine which may be in one of three +# states: reading the C code fragment, inside a texi fragment, +# or inside a rST fragment. +class HxState(Enum): + CTEXT = 1 + TEXI = 2 + RST = 3 + +def serror(file, lnum, errtext): + """Raise an exception giving a user-friendly syntax error message""" + raise ExtensionError('%s line %d: syntax error: %s' % (file, lnum, errtext)) + +def parse_directive(line): + """Return first word of line, if any""" + return re.split('\W', line)[0] + +def parse_defheading(file, lnum, line): + """Handle a DEFHEADING directive""" + # The input should be "DEFHEADING(some string)", though note that + # the 'some string' could be the empty string. If the string is + # empty we ignore the directive -- these are used only to add + # blank lines in the plain-text content of the --help output. + # + # Return the heading text + match = re.match(r'DEFHEADING\((.*)\)', line) + if match is None: + serror(file, lnum, "Invalid DEFHEADING line") + return match.group(1) + +def parse_archheading(file, lnum, line): + """Handle an ARCHHEADING directive""" + # The input should be "ARCHHEADING(some string, other arg)", + # though note that the 'some string' could be the empty string. + # As with DEFHEADING, empty string ARCHHEADINGs will be ignored. + # + # Return the heading text + match = re.match(r'ARCHHEADING\((.*),.*\)', line) + if match is None: + serror(file, lnum, "Invalid ARCHHEADING line") + return match.group(1) + +class HxtoolDocDirective(Directive): + """Extract rST fragments from the specified .hx file""" + required_argument = 1 + optional_arguments = 1 + option_spec = { + 'hxfile': directives.unchanged_required + } + has_content = False + + def run(self): + env = self.state.document.settings.env + hxfile = env.config.hxtool_srctree + '/' + self.arguments[0] + + # Tell sphinx of the dependency + env.note_dependency(os.path.abspath(hxfile)) + + state = HxState.CTEXT + # We build up lines of rST in this ViewList, which we will + # later put into a 'section' node. + rstlist = ViewList() + current_node = None + node_list = [] + + with open(hxfile) as f: + lines = (l.rstrip() for l in f) + for lnum, line in enumerate(lines, 1): + directive = parse_directive(line) + + if directive == 'HXCOMM': + pass + elif directive == 'STEXI': + if state == HxState.RST: + serror(hxfile, lnum, 'expected ERST, found STEXI') + elif state == HxState.TEXI: + serror(hxfile, lnum, 'expected ETEXI, found STEXI') + else: + state = HxState.TEXI + elif directive == 'ETEXI': + if state == HxState.RST: + serror(hxfile, lnum, 'expected ERST, found ETEXI') + elif state == HxState.CTEXT: + serror(hxfile, lnum, 'expected STEXI, found ETEXI') + else: + state = HxState.CTEXT + elif directive == 'SRST': + if state == HxState.RST: + serror(hxfile, lnum, 'expected ERST, found SRST') + elif state == HxState.TEXI: + serror(hxfile, lnum, 'expected ETEXI, found SRST') + else: + state = HxState.RST + elif directive == 'ERST': + if state == HxState.TEXI: + serror(hxfile, lnum, 'expected ETEXI, found ERST') + elif state == HxState.CTEXT: + serror(hxfile, lnum, 'expected SRST, found ERST') + else: + state = HxState.CTEXT + elif directive == 'DEFHEADING' or directive == 'ARCHHEADING': + if directive == 'DEFHEADING': + heading = parse_defheading(hxfile, lnum, line) + else: + heading = parse_archheading(hxfile, lnum, line) + if heading == "": + continue + # Put the accumulated rST into the previous node, + # and then start a fresh section with this heading. + if len(rstlist) > 0: + if current_node is None: + # We had some rST fragments before the first + # DEFHEADING. We don't have a section to put + # these in, so rather than magicing up a section, + # make it a syntax error. + serror(hxfile, lnum, + 'first DEFHEADING must precede all rST text') + self.do_parse(rstlist, current_node) + rstlist = ViewList() + if current_node is not None: + node_list.append(current_node) + section_id = 'hxtool-%d' % env.new_serialno('hxtool') + current_node = nodes.section(ids=[section_id]) + current_node += nodes.title(heading, heading) + else: + # Not a directive: put in output if we are in rST fragment + if state == HxState.RST: + # Sphinx counts its lines from 0 + rstlist.append(line, hxfile, lnum - 1) + + if current_node is None: + # We don't have multiple sections, so just parse the rst + # fragments into a dummy node so we can return the children. + current_node = nodes.section() + self.do_parse(rstlist, current_node) + return current_node.children + else: + # Put the remaining accumulated rST into the last section, and + # return all the sections. + if len(rstlist) > 0: + self.do_parse(rstlist, current_node) + node_list.append(current_node) + return node_list + + # This is from kerneldoc.py -- it works around an API change in + # Sphinx between 1.6 and 1.7. Unlike kerneldoc.py, we use + # sphinx.util.nodes.nested_parse_with_titles() rather than the + # plain self.state.nested_parse(), and so we can drop the saving + # of title_styles and section_level that kerneldoc.py does, + # because nested_parse_with_titles() does that for us. + def do_parse(self, result, node): + if Use_SSI: + with switch_source_input(self.state, result): + nested_parse_with_titles(self.state, result, node) + else: + save = self.state.memo.reporter + self.state.memo.reporter = AutodocReporter(result, self.state.memo.reporter) + try: + nested_parse_with_titles(self.state, result, node) + finally: + self.state.memo.reporter = save + +def setup(app): + """ Register hxtool-doc directive with Sphinx""" + app.add_config_value('hxtool_srctree', None, 'env') + app.add_directive('hxtool-doc', HxtoolDocDirective) + + return dict( + version = __version__, + parallel_read_safe = True, + parallel_write_safe = True + ) |