From eaab06faa5540e02e4f4782c1a650c9805a36671 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Tue, 23 Mar 2021 10:40:07 +0100 Subject: [PATCH] qapi: Rework name checking in preparation of stricter checking Naming rules differ for the various kinds of names. To prepare enforcing them, define functions to check them: check_name_upper(), check_name_lower(), and check_name_camel(). For now, these merely wrap around check_name_str(), but that will change shortly. Replace the other uses of check_name_str() by appropriate uses of the wrappers. No change in behavior just yet. check_name_str() now returns the name without downstream and x- prefix, for use by the wrappers in later patches. Requires tweaking regexp @valid_name. It accepts the same strings as before. Signed-off-by: Markus Armbruster Message-Id: <20210323094025.3569441-11-armbru@redhat.com> Reviewed-by: Eric Blake [Commit message improved] --- scripts/qapi/expr.py | 51 ++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 36 insertions(+), 15 deletions(-) diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py index e00467636c..30285fe334 100644 --- a/scripts/qapi/expr.py +++ b/scripts/qapi/expr.py @@ -21,11 +21,12 @@ from .common import c_name from .error import QAPISemError -# Names must be letters, numbers, -, and _. They must start with letter, -# except for downstream extensions which must start with __RFQDN_. -# Dots are only valid in the downstream extension prefix. -valid_name = re.compile(r'^(__[a-zA-Z0-9.-]+_)?' - '[a-zA-Z][a-zA-Z0-9_-]*$') +# Names consist of letters, digits, -, and _, starting with a letter. +# An experimental name is prefixed with x-. A name of a downstream +# extension is prefixed with __RFQDN_. The latter prefix goes first. +valid_name = re.compile(r'(__[a-z0-9.-]+_)?' + r'(x-)?' + r'([a-z][a-z0-9_-]*)$', re.IGNORECASE) def check_name_is_str(name, info, source): @@ -37,16 +38,38 @@ def check_name_str(name, info, source, permit_upper=False): # Reserve the entire 'q_' namespace for c_name(), and for 'q_empty' # and 'q_obj_*' implicit type names. - if not valid_name.match(name) or \ - c_name(name, False).startswith('q_'): + match = valid_name.match(name) + if not match or c_name(name, False).startswith('q_'): raise QAPISemError(info, "%s has an invalid name" % source) if not permit_upper and name.lower() != name: raise QAPISemError( info, "%s uses uppercase in name" % source) + return match.group(3) + + +def check_name_upper(name, info, source): + stem = check_name_str(name, info, source, permit_upper=True) + # TODO reject '[a-z-]' in @stem + + +def check_name_lower(name, info, source, + permit_upper=False): + stem = check_name_str(name, info, source, permit_upper) + # TODO reject '_' in stem + + +def check_name_camel(name, info, source): + stem = check_name_str(name, info, source, permit_upper=True) + # TODO reject '[_-]' in stem, require CamelCase def check_defn_name_str(name, info, meta): - check_name_str(name, info, meta, permit_upper=True) + if meta == 'event': + check_name_upper(name, info, meta) + elif meta == 'command': + check_name_lower(name, info, meta, permit_upper=True) + else: + check_name_camel(name, info, meta) if name.endswith('Kind') or name.endswith('List'): raise QAPISemError( info, "%s name should not end in '%s'" % (meta, name[-4:])) @@ -163,8 +186,7 @@ def check_type(value, info, source, key_source = "%s member '%s'" % (source, key) if key.startswith('*'): key = key[1:] - check_name_str(key, info, key_source, - permit_upper=permit_upper) + check_name_lower(key, info, key_source, permit_upper) if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'): raise QAPISemError(info, "%s uses reserved name" % key_source) check_keys(arg, info, key_source, ['type'], ['if', 'features']) @@ -186,7 +208,7 @@ def check_features(features, info): check_keys(f, info, source, ['name'], ['if']) check_name_is_str(f['name'], info, source) source = "%s '%s'" % (source, f['name']) - check_name_str(f['name'], info, source) + check_name_lower(f['name'], info, source) check_if(f, info, source) @@ -213,8 +235,7 @@ def check_enum(expr, info): # Enum members may start with a digit if member_name[0].isdigit(): member_name = 'd' + member_name # Hack: hide the digit - check_name_str(member_name, info, source, - permit_upper=permit_upper) + check_name_lower(member_name, info, source, permit_upper) check_if(member, info, source) @@ -244,7 +265,7 @@ def check_union(expr, info): for (key, value) in members.items(): source = "'data' member '%s'" % key if discriminator is None: - check_name_str(key, info, source) + check_name_lower(key, info, source) # else: name is in discriminator enum, which gets checked check_keys(value, info, source, ['type'], ['if']) check_if(value, info, source) @@ -258,7 +279,7 @@ def check_alternate(expr, info): raise QAPISemError(info, "'data' must not be empty") for (key, value) in members.items(): source = "'data' member '%s'" % key - check_name_str(key, info, source) + check_name_lower(key, info, source) check_keys(value, info, source, ['type'], ['if']) check_if(value, info, source) check_type(value['type'], info, source) -- 2.11.4.GIT