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json: reuse regexp pattern subrules

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This commit is contained in:
ochafik 2024-03-10 16:49:53 +00:00
parent e8b78c28eb
commit 37b59d1d3b
1 changed files with 10 additions and 6 deletions
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16
examples/json-schema-to-grammar.py
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@ -119,7 +119,7 @@ class SchemaConverter:
def _visit_pattern(self, pattern, name):
assert pattern.startswith('^') and pattern.endswith('$'), 'Pattern must start with "^" and end with "$"'
pattern = pattern[1:-1]
next_id = 1
sub_rule_ids = {}
try:
def visit_seq(seq):
out = []
@ -135,7 +135,7 @@ class SchemaConverter:
return '(' + ' '.join(out) + ')'
def visit(pattern):
nonlocal next_id
nonlocal sub_rule_ids
if pattern[0] == re._parser.LITERAL:
return json.dumps(chr(pattern[1]))
@ -166,8 +166,12 @@ class SchemaConverter:
min_times = pattern[1][0]
max_times = pattern[1][1] if not pattern[1][1] == re._parser.MAXREPEAT else None
sub = visit(pattern[1][2])
sub = self._add_rule(f'{name}-{next_id}', sub)
next_id += 1
id = sub_rule_ids.get(sub)
if id is None:
id = self._add_rule(f'{name}-{len(sub_rule_ids) + 1}', sub)
sub_rule_ids[sub] = id
sub = id
if min_times == 0 and max_times is None:
return f'{sub}*'
@ -188,7 +192,7 @@ class SchemaConverter:
else:
raise ValueError(f'Unrecognized pattern: {pattern} ({type(pattern)})')
return visit(re._parser.parse(pattern))
return self._add_rule(name, visit(re._parser.parse(pattern)))
except BaseException as e:
raise Exception(f'Error processing pattern: {pattern}: {e}') from e
@ -292,7 +296,7 @@ class SchemaConverter:
return self._add_rule(rule_name, rule)
elif schema_type in (None, 'string') and 'pattern' in schema:
return self._add_rule(rule_name, self._visit_pattern(schema['pattern'], rule_name))
return self._visit_pattern(schema['pattern'], rule_name)
elif schema_type == 'object' and len(schema) == 1 or schema_type is None and len(schema) == 0:
# This depends on all primitive types