qapi: Factor QAPISchemaParser._include() out of .__init__()

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1489582656-31133-2-git-send-email-armbru@redhat.com>

scripts/qapi.py

@@ -268,34 +268,15 @@ def __init__(self, fp, previously_included=[], incl_info=None):
                 continue
 
             expr = self.get_expr(False)
-            if isinstance(expr, dict) and "include" in expr:
+            if 'include' in expr:
                 if len(expr) != 1:
                     raise QAPISemError(info, "Invalid 'include' directive")
                 include = expr["include"]
                 if not isinstance(include, str):
                     raise QAPISemError(info,
                                        "Value of 'include' must be a string")
-                incl_abs_fname = os.path.join(os.path.dirname(abs_fname),
-                                              include)
-                # catch inclusion cycle
-                inf = info
-                while inf:
-                    if incl_abs_fname == os.path.abspath(inf['file']):
-                        raise QAPISemError(info, "Inclusion loop for %s"
-                                           % include)
-                    inf = inf['parent']
-
-                # skip multiple include of the same file
-                if incl_abs_fname in previously_included:
-                    continue
-                try:
-                    fobj = open(incl_abs_fname, 'r')
-                except IOError as e:
-                    raise QAPISemError(info, '%s: %s' % (e.strerror, include))
-                exprs_include = QAPISchemaParser(fobj, previously_included,
-                                                 info)
-                self.exprs.extend(exprs_include.exprs)
-                self.docs.extend(exprs_include.docs)
+                self._include(include, info, os.path.dirname(abs_fname),
+                              previously_included)
             else:
                 expr_elem = {'expr': expr,
                              'info': info}
@@ -307,6 +288,26 @@ def __init__(self, fp, previously_included=[], incl_info=None):
 
                 self.exprs.append(expr_elem)
 
+    def _include(self, include, info, base_dir, previously_included):
+        incl_abs_fname = os.path.join(base_dir, include)
+        # catch inclusion cycle
+        inf = info
+        while inf:
+            if incl_abs_fname == os.path.abspath(inf['file']):
+                raise QAPISemError(info, "Inclusion loop for %s" % include)
+            inf = inf['parent']
+
+        # skip multiple include of the same file
+        if incl_abs_fname in previously_included:
+            return
+        try:
+            fobj = open(incl_abs_fname, 'r')
+        except IOError as e:
+            raise QAPISemError(info, '%s: %s' % (e.strerror, include))
+        exprs_include = QAPISchemaParser(fobj, previously_included, info)
+        self.exprs.extend(exprs_include.exprs)
+        self.docs.extend(exprs_include.docs)
+
     def accept(self, skip_comment=True):
         while True:
             self.tok = self.src[self.cursor]