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| author | Markus Armbruster <armbru@redhat.com> | 2015-06-09 16:54:09 +0200 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2015-06-18 14:12:34 +0200 |
| commit | a1366087270b312d94ff8c4031395a4218f160d4 (patch) | |
| tree | 58957c7c29d8b8f732188e45fe119f365a3607fe | |
| parent | 8608d2525186062099a38971c276752e7a38903a (diff) | |
qapi: Simplify inclusion cycle detection
We maintain a stack of filenames in include_hist for convenient cycle
detection.
As error_path() demonstrates, the same information is readily
available in the expr_info, so just use that, and drop include_hist.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
| -rw-r--r-- | scripts/qapi.py | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/scripts/qapi.py b/scripts/qapi.py index 716e348a3c..a24a7e2778 100644 --- a/scripts/qapi.py +++ b/scripts/qapi.py @@ -101,15 +101,10 @@ class QAPIExprError(Exception): class QAPISchema: - def __init__(self, fp, include_hist = [], - previously_included = [], incl_info = None): - """ include_hist is a stack used to detect inclusion cycles - previously_included is a global state used to avoid multiple - inclusions of the same file""" + def __init__(self, fp, previously_included = [], incl_info = None): abs_fname = os.path.abspath(fp.name) fname = fp.name self.fname = fname - self.include_hist = include_hist + [(fname, abs_fname)] previously_included.append(abs_fname) self.incl_info = incl_info self.src = fp.read() @@ -135,10 +130,13 @@ class QAPISchema: % include) incl_abs_fname = os.path.join(os.path.dirname(abs_fname), include) - for elem in self.include_hist: - if incl_abs_fname == elem[1]: + # catch inclusion cycle + inf = expr_info + while inf: + if incl_abs_fname == os.path.abspath(inf['file']): raise QAPIExprError(expr_info, "Inclusion loop for %s" % include) + inf = inf['parent'] # skip multiple include of the same file if incl_abs_fname in previously_included: continue @@ -147,8 +145,8 @@ class QAPISchema: except IOError, e: raise QAPIExprError(expr_info, '%s: %s' % (e.strerror, include)) - exprs_include = QAPISchema(fobj, self.include_hist, - previously_included, expr_info) + exprs_include = QAPISchema(fobj, previously_included, + expr_info) self.exprs.extend(exprs_include.exprs) else: expr_elem = {'expr': expr, |