aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPeter Maydell <peter.maydell@linaro.org>2020-01-31 15:36:08 +0000
committerPeter Maydell <peter.maydell@linaro.org>2020-09-22 16:39:46 +0100
commit33cbee76b5798f470358270bcd612c01488fb9ff (patch)
tree1953ca9c35d17d85149cefc278955e3612cb523a
parentb155f42035f4187e7c3e7a753d790ae1bb9864f2 (diff)
downloadqemu-arm-33cbee76b5798f470358270bcd612c01488fb9ff.tar.gz
scripts/qapi/parser.py: improve doc comment indent handling
Make the handling of indentation in doc comments more sophisticated, so that when we see a section like: Notes: some text some more text indented line 3 we save it for the doc-comment processing code as: some text some more text indented line 3 and when we see a section with the heading on its own line: Notes: some text some more text indented text we also accept that and save it in the same form. If we detect that the comment document text is not indented as much as we expect it to be, we throw a parse error. (We don't complain about over-indented sections, because for rST this can be legitimate markup.) The golden reference for the doc comment text is updated to remove the two 'wrong' indents; these now form a test case that we correctly stripped leading whitespace from an indented multi-line argument definition. We update the documentation in docs/devel/qapi-code-gen.txt to describe the new indentation rules. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- v5->v6: * various fixes to issues noted by Markus * we no longer special-case "Example" indentation * added a test case for the de-indent error * put the relevant part of the docs update into this patch (in the optimistic hope that if the series up to this point is OK then we could commit the first half and thus avoid further breaches of the new indent rules being committed)
-rw-r--r--docs/devel/qapi-code-gen.txt23
-rw-r--r--scripts/qapi/parser.py93
-rw-r--r--tests/qapi-schema/doc-bad-indent.err1
-rw-r--r--tests/qapi-schema/doc-bad-indent.json8
-rw-r--r--tests/qapi-schema/doc-bad-indent.out0
-rw-r--r--tests/qapi-schema/doc-good.out4
-rw-r--r--tests/qapi-schema/meson.build1
7 files changed, 109 insertions, 21 deletions
diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt
index 9eede44350..69eaffac37 100644
--- a/docs/devel/qapi-code-gen.txt
+++ b/docs/devel/qapi-code-gen.txt
@@ -901,6 +901,22 @@ commands and events), member (for structs and unions), branch (for
alternates), or value (for enums), and finally optional tagged
sections.
+Descriptions of arguments can span multiple lines. The description
+text can start on the line following the '@argname:', in which case
+it must not be indented at all. It can also start on the same line
+as the '@argname:'. In this case if it spans multiple lines then
+second and subsequent lines must be indented to line up with the
+first character of the first line of the description:
+
+# @argone:
+# This is a two line description
+# in the first style.
+#
+# @argtwo: This is a two line description
+# in the second style.
+
+The number of spaces between the ':' and the text is not significant.
+
FIXME: the parser accepts these things in almost any order.
FIXME: union branches should be described, too.
@@ -911,6 +927,13 @@ A tagged section starts with one of the following words:
"Note:"/"Notes:", "Since:", "Example"/"Examples", "Returns:", "TODO:".
The section ends with the start of a new section.
+The text of a section can start on a new line, in
+which case it must not be indented at all. It can also start
+on the same line as the 'Note:', 'Returns:', etc tag. In this
+case if it spans multiple lines then second and subsequent
+lines must be indented to match the first, in the same way as
+multiline argument descriptions.
+
A 'Since: x.y.z' tagged section lists the release that introduced the
definition.
diff --git a/scripts/qapi/parser.py b/scripts/qapi/parser.py
index 04bf10db37..6c3455b41f 100644
--- a/scripts/qapi/parser.py
+++ b/scripts/qapi/parser.py
@@ -319,17 +319,32 @@ class QAPIDoc:
"""
class Section:
- def __init__(self, name=None):
+ def __init__(self, parser, name=None, indent=0):
+ # parser, for error messages about indentation
+ self._parser = parser
# optional section name (argument/member or section name)
self.name = name
self.text = ''
+ # the expected indent level of the text of this section
+ self._indent = indent
def append(self, line):
+ # Strip leading spaces corresponding to the expected indent level
+ # Blank lines are always OK.
+ if line:
+ indent = re.match(r'\s*', line).end()
+ if indent < self._indent:
+ raise QAPIParseError(
+ self._parser,
+ "unexpected de-indent (expected at least %d spaces)" %
+ self._indent)
+ line = line[self._indent:]
+
self.text += line.rstrip() + '\n'
class ArgSection(Section):
- def __init__(self, name):
- super().__init__(name)
+ def __init__(self, parser, name, indent=0):
+ super().__init__(parser, name, indent)
self.member = None
def connect(self, member):
@@ -343,7 +358,7 @@ class QAPIDoc:
self._parser = parser
self.info = info
self.symbol = None
- self.body = QAPIDoc.Section()
+ self.body = QAPIDoc.Section(parser)
# dict mapping parameter name to ArgSection
self.args = OrderedDict()
self.features = OrderedDict()
@@ -447,8 +462,21 @@ class QAPIDoc:
name = line.split(' ', 1)[0]
if name.startswith('@') and name.endswith(':'):
- line = line[len(name)+1:]
- self._start_args_section(name[1:-1])
+ # If line is "@arg: first line of description", find the
+ # index of 'f', which is the indent we expect for any
+ # following lines. We then remove the leading "@arg:" from line
+ # and replace it with spaces so that 'f' has the same index
+ # as it did in the original line and can be handled the same
+ # way we will handle following lines.
+ indent = re.match(r'@\S*:\s*', line).end()
+ line = line[indent:]
+ if not line:
+ # Line was just the "@arg:" header; following lines
+ # are not indented
+ indent = 0
+ else:
+ line = ' ' * indent + line
+ self._start_args_section(name[1:-1], indent)
elif self._is_section_tag(name):
self._append_line = self._append_various_line
self._append_various_line(line)
@@ -469,8 +497,21 @@ class QAPIDoc:
name = line.split(' ', 1)[0]
if name.startswith('@') and name.endswith(':'):
- line = line[len(name)+1:]
- self._start_features_section(name[1:-1])
+ # If line is "@arg: first line of description", find the
+ # index of 'f', which is the indent we expect for any
+ # following lines. We then remove the leading "@arg:" from line
+ # and replace it with spaces so that 'f' has the same index
+ # as it did in the original line and can be handled the same
+ # way we will handle following lines.
+ indent = re.match(r'@\S*:\s*', line).end()
+ line = line[indent:]
+ if not line:
+ # Line was just the "@arg:" header; following lines
+ # are not indented
+ indent = 0
+ else:
+ line = ' ' * indent + line
+ self._start_features_section(name[1:-1], indent)
elif self._is_section_tag(name):
self._append_line = self._append_various_line
self._append_various_line(line)
@@ -502,12 +543,25 @@ class QAPIDoc:
"'%s' can't follow '%s' section"
% (name, self.sections[0].name))
if self._is_section_tag(name):
- line = line[len(name)+1:]
- self._start_section(name[:-1])
+ # If line is "Section: first line of description", find the
+ # index of 'f', which is the indent we expect for any
+ # following lines. We then remove the leading "Section:" from line
+ # and replace it with spaces so that 'f' has the same index
+ # as it did in the original line and can be handled the same
+ # way we will handle following lines.
+ indent = re.match(r'\S*:\s*', line).end()
+ line = line[indent:]
+ if not line:
+ # Line was just the "Section:" header; following lines
+ # are not indented
+ indent = 0
+ else:
+ line = ' ' * indent + line
+ self._start_section(name[:-1], indent)
self._append_freeform(line)
- def _start_symbol_section(self, symbols_dict, name):
+ def _start_symbol_section(self, symbols_dict, name, indent):
# FIXME invalid names other than the empty string aren't flagged
if not name:
raise QAPIParseError(self._parser, "invalid parameter name")
@@ -516,21 +570,21 @@ class QAPIDoc:
"'%s' parameter name duplicated" % name)
assert not self.sections
self._end_section()
- self._section = QAPIDoc.ArgSection(name)
+ self._section = QAPIDoc.ArgSection(self._parser, name, indent)
symbols_dict[name] = self._section
- def _start_args_section(self, name):
- self._start_symbol_section(self.args, name)
+ def _start_args_section(self, name, indent):
+ self._start_symbol_section(self.args, name, indent)
- def _start_features_section(self, name):
- self._start_symbol_section(self.features, name)
+ def _start_features_section(self, name, indent):
+ self._start_symbol_section(self.features, name, indent)
- def _start_section(self, name=None):
+ def _start_section(self, name=None, indent=0):
if name in ('Returns', 'Since') and self.has_section(name):
raise QAPIParseError(self._parser,
"duplicated '%s' section" % name)
self._end_section()
- self._section = QAPIDoc.Section(name)
+ self._section = QAPIDoc.Section(self._parser, name, indent)
self.sections.append(self._section)
def _end_section(self):
@@ -553,7 +607,8 @@ class QAPIDoc:
def connect_member(self, member):
if member.name not in self.args:
# Undocumented TODO outlaw
- self.args[member.name] = QAPIDoc.ArgSection(member.name)
+ self.args[member.name] = QAPIDoc.ArgSection(self._parser,
+ member.name)
self.args[member.name].connect(member)
def connect_feature(self, feature):
diff --git a/tests/qapi-schema/doc-bad-indent.err b/tests/qapi-schema/doc-bad-indent.err
new file mode 100644
index 0000000000..67844539bd
--- /dev/null
+++ b/tests/qapi-schema/doc-bad-indent.err
@@ -0,0 +1 @@
+doc-bad-indent.json:6:1: unexpected de-indent (expected at least 4 spaces)
diff --git a/tests/qapi-schema/doc-bad-indent.json b/tests/qapi-schema/doc-bad-indent.json
new file mode 100644
index 0000000000..edde8f21dc
--- /dev/null
+++ b/tests/qapi-schema/doc-bad-indent.json
@@ -0,0 +1,8 @@
+# Multiline doc comments should have consistent indentation
+
+##
+# @foo:
+# @a: line one
+# line two is wrongly indented
+##
+{ 'command': 'foo', 'data': { 'a': 'int' } }
diff --git a/tests/qapi-schema/doc-bad-indent.out b/tests/qapi-schema/doc-bad-indent.out
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/qapi-schema/doc-bad-indent.out
diff --git a/tests/qapi-schema/doc-good.out b/tests/qapi-schema/doc-good.out
index 9993ffcd89..b7e3f4313d 100644
--- a/tests/qapi-schema/doc-good.out
+++ b/tests/qapi-schema/doc-good.out
@@ -159,7 +159,7 @@ doc symbol=Alternate
arg=i
an integer
- @b is undocumented
+@b is undocumented
arg=b
feature=alt-feat
@@ -174,7 +174,7 @@ doc symbol=cmd
the first argument
arg=arg2
the second
- argument
+argument
arg=arg3
feature=cmd-feat1
diff --git a/tests/qapi-schema/meson.build b/tests/qapi-schema/meson.build
index f1449298b0..83a0a68389 100644
--- a/tests/qapi-schema/meson.build
+++ b/tests/qapi-schema/meson.build
@@ -53,6 +53,7 @@ schemas = [
'doc-bad-enum-member.json',
'doc-bad-event-arg.json',
'doc-bad-feature.json',
+ 'doc-bad-indent.json',
'doc-bad-section.json',
'doc-bad-symbol.json',
'doc-bad-union-member.json',