From 1f9419be4480a12680400813eab98657d7169893 Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Mon, 19 Feb 2018 13:57:43 -0500
Subject: [PATCH] qapi: Allow true, false and null in schema json

In the near term, we will use it for a sensible-looking
'gen':false inside command declarations, instead of the
current ugly 'gen':'no'.

In the long term, it will allow conversion from shorthand
with defaults mentioned only in side-band documentation:
'data':{'*flag':'bool', '*string':'str'}
into an explicit default value documentation, as in:
'data':{'flag':{'type':'bool', 'optional':true, 'default':true},
'string':{'type':'str', 'optional':true, 'default':null}}

We still don't parse integer values (also necessary before
we can allow explicit defaults), but that can come in a later
series.

Backports commit e53188ada516c814a729551be2448684d6d8ce08 from qemu
---
 qemu/scripts/qapi.py | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/qemu/scripts/qapi.py b/qemu/scripts/qapi.py
index 0af8149d..b01e783f 100644
--- a/qemu/scripts/qapi.py
+++ b/qemu/scripts/qapi.py
@@ -158,6 +158,20 @@ class QAPISchema:
                         return
                     else:
                         string += ch
+            elif self.tok in "tfn":
+                val = self.src[self.cursor - 1:]
+                if val.startswith("true"):
+                    self.val = True
+                    self.cursor += 3
+                    return
+                elif val.startswith("false"):
+                    self.val = False
+                    self.cursor += 4
+                    return
+                elif val.startswith("null"):
+                    self.val = None
+                    self.cursor += 3
+                    return
             elif self.tok == '\n':
                 if self.cursor == len(self.src):
                     self.tok = None
@@ -197,8 +211,9 @@ class QAPISchema:
         if self.tok == ']':
             self.accept()
             return expr
-        if not self.tok in [ '{', '[', "'" ]:
-            raise QAPISchemaError(self, 'Expected "{", "[", "]" or string')
+        if not self.tok in "{['tfn":
+            raise QAPISchemaError(self, 'Expected "{", "[", "]", string, '
+                                  'boolean or "null"')
         while True:
             expr.append(self.get_expr(True))
             if self.tok == ']':
@@ -217,7 +232,7 @@ class QAPISchema:
         elif self.tok == '[':
             self.accept()
             expr = self.get_values()
-        elif self.tok == "'":
+        elif self.tok in "'tfn":
             expr = self.val
             self.accept()
         else: