From 3313b6124b524893683311e01437a82b40784e8b Mon Sep 17 00:00:00 2001
From: Marc-André Lureau
Date: Fri, 13 Jan 2017 15:41:29 +0100
Subject: qapi: add qapi2texi script

As the name suggests, the qapi2texi script converts JSON QAPI
description into a texi file suitable for different target
formats (info/man/txt/pdf/html...).

It parses the following kind of blocks:

Free-form:

  ##
  # = Section
  # == Subsection
  #
  # Some text foo with *emphasis*
  # 1. with a list
  # 2. like that
  #
  # And some code:
  # | $ echo foo
  # | -> do this
  # | <- get that
  #
  ##

Symbol description:

  ##
  # @symbol:
  #
  # Symbol body ditto ergo sum. Foo bar
  # baz ding.
  #
  # @param1: the frob to frobnicate
  # @param2: #optional how hard to frobnicate
  #
  # Returns: the frobnicated frob.
  #          If frob isn't frobnicatable, GenericError.
  #
  # Since: version
  # Notes: notes, comments can have
  #        - itemized list
  #        - like this
  #
  # Example:
  #
  # -> { "execute": "quit" }
  # <- { "return": {} }
  #
  ##

That's roughly following the following EBNF grammar:

api_comment = "##\n" comment "##\n"
comment = freeform_comment | symbol_comment
freeform_comment = { "# " text "\n" | "#\n" }
symbol_comment = "# @" name ":\n" { member | tag_section | freeform_comment }
member = "# @" name ':' [ text ] "\n" freeform_comment
tag_section = "# " ( "Returns:", "Since:", "Note:", "Notes:", "Example:", "Examples:" ) [ text ]  "\n" freeform_comment
text = free text with markup

Note that the grammar is ambiguous: a line "# @foo:\n" can be parsed
both as freeform_comment and as symbol_comment.  The actual parser
recognizes symbol_comment.

See docs/qapi-code-gen.txt for more details.

Deficiencies and limitations:
- the generated QMP documentation includes internal types
- union type support is lacking
- type information is lacking in generated documentation
- doc comment error message positions are imprecise, they point
  to the beginning of the comment.
- a few minor issues, all marked TODO/FIXME in the code

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170113144135.5150-16-marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[test-qapi.py tweaked to avoid trailing empty lines in .out]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 tests/qapi-schema/flat-union-string-discriminator.json | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'tests/qapi-schema/flat-union-string-discriminator.json')

diff --git a/tests/qapi-schema/flat-union-string-discriminator.json b/tests/qapi-schema/flat-union-string-discriminator.json
index 8af60333b6..47a17d2e4a 100644
--- a/tests/qapi-schema/flat-union-string-discriminator.json
+++ b/tests/qapi-schema/flat-union-string-discriminator.json
@@ -1,15 +1,30 @@
+##
+# @TestEnum:
+##
 { 'enum': 'TestEnum',
   'data': [ 'value1', 'value2' ] }
 
+##
+# @TestBase:
+##
 { 'struct': 'TestBase',
   'data': { 'enum1': 'TestEnum', 'kind': 'str' } }
 
+##
+# @TestTypeA:
+##
 { 'struct': 'TestTypeA',
   'data': { 'string': 'str' } }
 
+##
+# @TestTypeB:
+##
 { 'struct': 'TestTypeB',
   'data': { 'integer': 'int' } }
 
+##
+# @TestUnion:
+##
 { 'union': 'TestUnion',
   'base': 'TestBase',
   'discriminator': 'kind',
-- 
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