diff options
Diffstat (limited to 'scripts/qapi/common.py')
| -rw-r--r-- | scripts/qapi/common.py | 127 |
1 files changed, 102 insertions, 25 deletions
diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py index 9e4b6c00b5..f40a2cd4c5 100644 --- a/scripts/qapi/common.py +++ b/scripts/qapi/common.py @@ -120,6 +120,24 @@ class QAPIDoc(object): def connect(self, member): self.member = member + class DocPart: + """ + Describes which part of the documentation we're parsing right now. + + Expression documentation blocks consist of + * a BODY part: first line naming the expression, plus an + optional overview + * an ARGS part: description of each argument (for commands and + events) or member (for structs, unions and alternates), + * a VARIOUS part: optional tagged sections. + + Free-form documentation blocks consist only of a BODY part. + """ + # TODO Make it a subclass of Enum when Python 2 support is removed + BODY = 1 + ARGS = 2 + VARIOUS = 3 + def __init__(self, parser, info): # self._parser is used to report errors with QAPIParseError. The # resulting error position depends on the state of the parser. @@ -135,6 +153,7 @@ class QAPIDoc(object): self.sections = [] # the current section self._section = self.body + self._part = QAPIDoc.DocPart.BODY def has_section(self, name): """Return True if we have a section with this name.""" @@ -144,7 +163,27 @@ class QAPIDoc(object): return False def append(self, line): - """Parse a comment line and add it to the documentation.""" + """ + Parse a comment line and add it to the documentation. + + The way that the line is dealt with depends on which part of + the documentation we're parsing right now: + + BODY means that we're ready to process free-form text into + self.body. A symbol name is only allowed if no other text was + parsed yet. It is interpreted as the symbol name that + describes the currently documented object. On getting the + second symbol name, we proceed to ARGS. + + ARGS means that we're parsing the arguments section. Any + symbol name is interpreted as an argument and an ArgSection is + created for it. + + VARIOUS is the final part where free-form sections may appear. + This includes named sections such as "Return:" as well as + unnamed paragraphs. Symbols are not allowed any more in this + part. + """ line = line[1:] if not line: self._append_freeform(line) @@ -154,37 +193,85 @@ class QAPIDoc(object): raise QAPIParseError(self._parser, "Missing space after #") line = line[1:] + if self._part == QAPIDoc.DocPart.BODY: + self._append_body_line(line) + elif self._part == QAPIDoc.DocPart.ARGS: + self._append_args_line(line) + elif self._part == QAPIDoc.DocPart.VARIOUS: + self._append_various_line(line) + else: + assert False + + def end_comment(self): + self._end_section() + + @staticmethod + def _is_section_tag(name): + return name in ('Returns:', 'Since:', + # those are often singular or plural + 'Note:', 'Notes:', + 'Example:', 'Examples:', + 'TODO:') + + def _append_body_line(self, line): + name = line.split(' ', 1)[0] # FIXME not nice: things like '# @foo:' and '# @foo: ' aren't # recognized, and get silently treated as ordinary text - if self.symbol: - self._append_symbol_line(line) - elif not self.body.text and line.startswith('@'): + if not self.symbol and not self.body.text and line.startswith('@'): if not line.endswith(':'): raise QAPIParseError(self._parser, "Line should end with :") self.symbol = line[1:-1] # FIXME invalid names other than the empty string aren't flagged if not self.symbol: raise QAPIParseError(self._parser, "Invalid name") + elif self.symbol: + # We already know that we document some symbol + if name.startswith('@') and name.endswith(':'): + self._part = QAPIDoc.DocPart.ARGS + self._append_args_line(line) + elif self._is_section_tag(name): + self._part = QAPIDoc.DocPart.VARIOUS + self._append_various_line(line) + else: + self._append_freeform(line.strip()) else: - self._append_freeform(line) + # This is free-form documentation without a symbol + self._append_freeform(line.strip()) - def end_comment(self): - self._end_section() - - def _append_symbol_line(self, line): + def _append_args_line(self, line): name = line.split(' ', 1)[0] if name.startswith('@') and name.endswith(':'): line = line[len(name)+1:] self._start_args_section(name[1:-1]) - elif name in ('Returns:', 'Since:', - # those are often singular or plural - 'Note:', 'Notes:', - 'Example:', 'Examples:', - 'TODO:'): + elif self._is_section_tag(name): + self._part = QAPIDoc.DocPart.VARIOUS + self._append_various_line(line) + return + elif (self._section.text.endswith('\n\n') + and line and not line[0].isspace()): + self._start_section() + self._part = QAPIDoc.DocPart.VARIOUS + self._append_various_line(line) + return + + self._append_freeform(line.strip()) + + def _append_various_line(self, line): + name = line.split(' ', 1)[0] + + if name.startswith('@') and name.endswith(':'): + raise QAPIParseError(self._parser, + "'%s' can't follow '%s' section" + % (name, self.sections[0].name)) + elif self._is_section_tag(name): line = line[len(name)+1:] self._start_section(name[:-1]) + if (not self._section.name or + not self._section.name.startswith('Example')): + line = line.strip() + self._append_freeform(line) def _start_args_section(self, name): @@ -194,10 +281,7 @@ class QAPIDoc(object): if name in self.args: raise QAPIParseError(self._parser, "'%s' parameter name duplicated" % name) - if self.sections: - raise QAPIParseError(self._parser, - "'@%s:' can't follow '%s' section" - % (name, self.sections[0].name)) + assert not self.sections self._end_section() self._section = QAPIDoc.ArgSection(name) self.args[name] = self._section @@ -219,13 +303,6 @@ class QAPIDoc(object): self._section = None def _append_freeform(self, line): - in_arg = isinstance(self._section, QAPIDoc.ArgSection) - if (in_arg and self._section.text.endswith('\n\n') - and line and not line[0].isspace()): - self._start_section() - if (in_arg or not self._section.name - or not self._section.name.startswith('Example')): - line = line.strip() match = re.match(r'(@\S+:)', line) if match: raise QAPIParseError(self._parser, |