72114edf06
* json: ordered json in server/schema converter to respect orig order * json: ws nits * json: support non-string const / enums
551 lines
23 KiB
Python
Executable file
551 lines
23 KiB
Python
Executable file
#!/usr/bin/env python3
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import argparse
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import itertools
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import json
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import re
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import sys
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from typing import Any, Dict, List, Set, Tuple, Union
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# whitespace is constrained to a single space char to prevent model "running away" in
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# whitespace. Also maybe improves generation quality?
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SPACE_RULE = '" "?'
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PRIMITIVE_RULES = {
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'boolean': '("true" | "false") space',
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'number': '("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space',
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'integer': '("-"? ([0-9] | [1-9] [0-9]*)) space',
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'value' : 'object | array | string | number | boolean',
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'object' : '"{" space ( string ":" space value ("," space string ":" space value)* )? "}" space',
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'array' : '"[" space ( value ("," space value)* )? "]" space',
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'uuid' : '"\\"" ' + ' "-" '.join('[0-9a-fA-F]' * n for n in [8, 4, 4, 4, 12]) + ' "\\"" space',
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'string': r''' "\"" (
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[^"\\] |
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"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])
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)* "\"" space''',
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'null': '"null" space',
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}
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OBJECT_RULE_NAMES = ['object', 'array', 'string', 'number', 'boolean', 'null', 'value']
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# TODO: support "uri", "email" string formats
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DATE_RULES = {
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'date' : '[0-9] [0-9] [0-9] [0-9] "-" ( "0" [1-9] | "1" [0-2] ) "-" ( \"0\" [1-9] | [1-2] [0-9] | "3" [0-1] )',
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'time' : '([01] [0-9] | "2" [0-3]) ":" [0-5] [0-9] ":" [0-5] [0-9] ( "." [0-9] [0-9] [0-9] )? ( "Z" | ( "+" | "-" ) ( [01] [0-9] | "2" [0-3] ) ":" [0-5] [0-9] )',
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'date-time': 'date "T" time',
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'date-string': '"\\"" date "\\"" space',
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'time-string': '"\\"" time "\\"" space',
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'date-time-string': '"\\"" date-time "\\"" space',
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}
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RESERVED_NAMES = set(["root", *PRIMITIVE_RULES.keys(), *DATE_RULES.keys()])
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INVALID_RULE_CHARS_RE = re.compile(r'[^a-zA-Z0-9-]+')
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GRAMMAR_LITERAL_ESCAPE_RE = re.compile(r'[\r\n"]')
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GRAMMAR_RANGE_LITERAL_ESCAPE_RE = re.compile(r'[\r\n"\]\-\\]')
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GRAMMAR_LITERAL_ESCAPES = {'\r': '\\r', '\n': '\\n', '"': '\\"', '-': '\\-', ']': '\\]'}
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NON_LITERAL_SET = set('|.()[]{}*+?')
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ESCAPED_IN_REGEXPS_BUT_NOT_IN_LITERALS = set('[]()|{}*+?')
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DATE_PATTERN = '[0-9]{4}-(0[1-9]|1[0-2])-([0-2][0-9]|3[0-1])'
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TIME_PATTERN = '([01][0-9]|2[0-3])(:[0-5][0-9]){2}(\\.[0-9]{1,3})?(Z|[+-](([01][0-9]|2[0-3]):[0-5][0-9]))' # Cap millisecond precision w/ 3 digits
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class SchemaConverter:
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def __init__(self, *, prop_order, allow_fetch, dotall, raw_pattern):
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self._prop_order = prop_order
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self._allow_fetch = allow_fetch
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self._dotall = dotall
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self._raw_pattern = raw_pattern
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self._rules = {'space': SPACE_RULE}
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self._refs = {}
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self._refs_being_resolved = set()
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def _format_literal(self, literal):
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escaped = GRAMMAR_LITERAL_ESCAPE_RE.sub(
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lambda m: GRAMMAR_LITERAL_ESCAPES.get(m.group(0)), literal
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)
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return f'"{escaped}"'
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def _add_rule(self, name, rule):
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esc_name = INVALID_RULE_CHARS_RE.sub('-', name)
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if esc_name not in self._rules or self._rules[esc_name] == rule:
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key = esc_name
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else:
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i = 0
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while f'{esc_name}{i}' in self._rules and self._rules[f'{esc_name}{i}'] != rule:
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i += 1
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key = f'{esc_name}{i}'
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self._rules[key] = rule
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return key
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def resolve_refs(self, schema: dict, url: str):
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'''
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Resolves all $ref fields in the given schema, fetching any remote schemas,
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replacing $ref with absolute reference URL and populating self._refs with the
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respective referenced (sub)schema dictionaries.
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'''
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def visit(n: dict):
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if isinstance(n, list):
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return [visit(x) for x in n]
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elif isinstance(n, dict):
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ref = n.get('$ref')
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if ref is not None and ref not in self._refs:
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if ref.startswith('https://'):
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assert self._allow_fetch, 'Fetching remote schemas is not allowed (use --allow-fetch for force)'
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import requests
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frag_split = ref.split('#')
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base_url = frag_split[0]
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target = self._refs.get(base_url)
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if target is None:
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target = self.resolve_refs(requests.get(ref).json(), base_url)
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self._refs[base_url] = target
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if len(frag_split) == 1 or frag_split[-1] == '':
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return target
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elif ref.startswith('#/'):
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target = schema
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ref = f'{url}{ref}'
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n['$ref'] = ref
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else:
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raise ValueError(f'Unsupported ref {ref}')
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for sel in ref.split('#')[-1].split('/')[1:]:
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assert target is not None and sel in target, f'Error resolving ref {ref}: {sel} not in {target}'
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target = target[sel]
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self._refs[ref] = target
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else:
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for v in n.values():
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visit(v)
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return n
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return visit(schema)
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def _generate_union_rule(self, name, alt_schemas):
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return ' | '.join((
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self.visit(alt_schema, f'{name}{"-" if name else "alternative-"}{i}')
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for i, alt_schema in enumerate(alt_schemas)
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))
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def _visit_pattern(self, pattern, name):
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'''
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Transforms a regular expression pattern into a GBNF rule.
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Input: https://json-schema.org/understanding-json-schema/reference/regular_expressions
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Output: https://github.com/ggerganov/llama.cpp/blob/master/grammars/README.md
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Unsupported features: negative/positive lookaheads, greedy/non-greedy modifiers.
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Mostly a 1:1 translation, except for {x} / {x,} / {x,y} quantifiers for which
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we define sub-rules to keep the output lean.
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'''
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assert pattern.startswith('^') and pattern.endswith('$'), 'Pattern must start with "^" and end with "$"'
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pattern = pattern[1:-1]
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sub_rule_ids = {}
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i = 0
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length = len(pattern)
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def to_rule(s: Tuple[str, bool]) -> str:
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(txt, is_literal) = s
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return "\"" + txt + "\"" if is_literal else txt
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def transform() -> Tuple[str, bool]:
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'''
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Parse a unit at index i (advancing it), and return its string representation + whether it's a literal.
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'''
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nonlocal i
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nonlocal pattern
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nonlocal sub_rule_ids
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start = i
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# For each component of this sequence, store its string representation and whether it's a literal.
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# We only need a flat structure here to apply repetition operators to the last item, and
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# to merge literals at the and (we're parsing grouped ( sequences ) recursively and don't treat '|' specially
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# (GBNF's syntax is luckily very close to regular expressions!)
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seq: list[Tuple[str, bool]] = []
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def get_dot():
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if self._dotall:
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rule = '[\\U00000000-\\U0010FFFF]'
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else:
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# Accept any character... except \n and \r line break chars (\x0A and \xOD)
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rule = '[\\U00000000-\\x09\\x0B\\x0C\\x0E-\\U0010FFFF]'
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return self._add_rule(f'dot', rule)
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def join_seq():
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nonlocal seq
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ret = []
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for is_literal, g in itertools.groupby(seq, lambda x: x[1]):
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if is_literal:
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ret.append((''.join(x[0] for x in g), True))
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else:
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ret.extend(g)
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if len(ret) == 1:
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return ret[0]
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return (' '.join(to_rule(x) for x in seq), False)
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while i < length:
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c = pattern[i]
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if c == '.':
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seq.append((get_dot(), False))
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i += 1
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elif c == '(':
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i += 1
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if i < length:
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assert pattern[i] != '?', f'Unsupported pattern syntax "{pattern[i]}" at index {i} of /{pattern}/'
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seq.append((f'({to_rule(transform())})', False))
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elif c == ')':
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i += 1
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assert start > 0 and pattern[start-1] == '(', f'Unbalanced parentheses; start = {start}, i = {i}, pattern = {pattern}'
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return join_seq()
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elif c == '[':
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square_brackets = c
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i += 1
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while i < length and pattern[i] != ']':
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if pattern[i] == '\\':
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square_brackets += pattern[i:i+2]
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i += 2
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else:
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square_brackets += pattern[i]
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i += 1
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assert i < length, f'Unbalanced square brackets; start = {start}, i = {i}, pattern = {pattern}'
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square_brackets += ']'
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i += 1
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seq.append((square_brackets, False))
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elif c == '|':
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seq.append(('|', False))
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i += 1
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elif c in ('*', '+', '?'):
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seq[-1] = (to_rule(seq[-1]) + c, False)
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i += 1
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elif c == '{':
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curly_brackets = c
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i += 1
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while i < length and pattern[i] != '}':
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curly_brackets += pattern[i]
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i += 1
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assert i < length, f'Unbalanced curly brackets; start = {start}, i = {i}, pattern = {pattern}'
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curly_brackets += '}'
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i += 1
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nums = [s.strip() for s in curly_brackets[1:-1].split(',')]
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min_times = 0
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max_times = None
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try:
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if len(nums) == 1:
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min_times = int(nums[0])
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max_times = min_times
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else:
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assert len(nums) == 2
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min_times = int(nums[0]) if nums[0] else 0
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max_times = int(nums[1]) if nums[1] else None
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except ValueError:
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raise ValueError(f'Invalid quantifier {curly_brackets} in /{pattern}/')
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(sub, sub_is_literal) = seq[-1]
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if min_times == 0 and max_times is None:
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seq[-1] = (f'{sub}*', False)
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elif min_times == 0 and max_times == 1:
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seq[-1] = (f'{sub}?', False)
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elif min_times == 1 and max_times is None:
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seq[-1] = (f'{sub}+', False)
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else:
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if not sub_is_literal:
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id = sub_rule_ids.get(sub)
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if id is None:
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id = self._add_rule(f'{name}-{len(sub_rule_ids) + 1}', sub)
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sub_rule_ids[sub] = id
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sub = id
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seq[-1] = (
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' '.join(
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([f'"{sub[1:-1] * min_times}"'] if sub_is_literal else [sub] * min_times) +
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([f'{sub}?'] * (max_times - min_times) if max_times is not None else [f'{sub}*'])),
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False
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)
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else:
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literal = ''
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while i < length:
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if pattern[i] == '\\' and i < length - 1:
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next = pattern[i + 1]
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if next in ESCAPED_IN_REGEXPS_BUT_NOT_IN_LITERALS:
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i += 1
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literal += pattern[i]
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i += 1
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else:
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literal += pattern[i:i+2]
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i += 2
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elif pattern[i] == '"' and not self._raw_pattern:
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literal += '\\"'
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i += 1
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elif pattern[i] not in NON_LITERAL_SET and \
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(i == length - 1 or literal == '' or pattern[i+1] == '.' or pattern[i+1] not in NON_LITERAL_SET):
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literal += pattern[i]
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i += 1
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else:
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break
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if literal:
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seq.append((literal, True))
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return join_seq()
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return self._add_rule(
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name,
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to_rule(transform()) if self._raw_pattern \
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else "\"\\\"\" " + to_rule(transform()) + " \"\\\"\" space")
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def _resolve_ref(self, ref):
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ref_name = ref.split('/')[-1]
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if ref_name not in self._rules and ref not in self._refs_being_resolved:
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self._refs_being_resolved.add(ref)
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resolved = self._refs[ref]
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ref_name = self.visit(resolved, ref_name)
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self._refs_being_resolved.remove(ref)
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return ref_name
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def _generate_constant_rule(self, value):
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return self._format_literal(json.dumps(value))
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def visit(self, schema, name):
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schema_type = schema.get('type')
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schema_format = schema.get('format')
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rule_name = name + '-' if name in RESERVED_NAMES else name or 'root'
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if (ref := schema.get('$ref')) is not None:
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return self._add_rule(rule_name, self._resolve_ref(ref))
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elif 'oneOf' in schema or 'anyOf' in schema:
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return self._add_rule(rule_name, self._generate_union_rule(name, schema.get('oneOf') or schema['anyOf']))
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elif isinstance(schema_type, list):
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return self._add_rule(rule_name, self._generate_union_rule(name, [{'type': t} for t in schema_type]))
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elif 'const' in schema:
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return self._add_rule(rule_name, self._generate_constant_rule(schema['const']))
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elif 'enum' in schema:
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rule = ' | '.join((self._generate_constant_rule(v) for v in schema['enum']))
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return self._add_rule(rule_name, rule)
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elif schema_type in (None, 'object') and \
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('properties' in schema or \
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('additionalProperties' in schema and schema['additionalProperties'] is not True)):
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required = set(schema.get('required', []))
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properties = list(schema.get('properties', {}).items())
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return self._add_rule(rule_name, self._build_object_rule(properties, required, name, schema.get('additionalProperties')))
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elif schema_type in (None, 'object') and 'allOf' in schema:
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required = set()
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properties = []
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hybrid_name = name
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def add_component(comp_schema, is_required):
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if (ref := comp_schema.get('$ref')) is not None:
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comp_schema = self._refs[ref]
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if 'properties' in comp_schema:
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for prop_name, prop_schema in comp_schema['properties'].items():
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properties.append((prop_name, prop_schema))
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if is_required:
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required.add(prop_name)
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for t in schema['allOf']:
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if 'anyOf' in t:
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for tt in t['anyOf']:
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add_component(tt, is_required=False)
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else:
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add_component(t, is_required=True)
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return self._add_rule(rule_name, self._build_object_rule(properties, required, hybrid_name, additional_properties=[]))
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elif schema_type in (None, 'array') and ('items' in schema or 'prefixItems' in schema):
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items = schema.get('items') or schema['prefixItems']
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if isinstance(items, list):
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return self._add_rule(
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rule_name,
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'"[" space ' +
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' "," space '.join(
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self.visit(item, f'{name}{"-" if name else ""}tuple-{i}')
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for i, item in enumerate(items)) +
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' "]" space')
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else:
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item_rule_name = self.visit(items, f'{name}{"-" if name else ""}item')
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list_item_operator = f'( "," space {item_rule_name} )'
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successive_items = ""
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min_items = schema.get("minItems", 0)
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max_items = schema.get("maxItems")
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if min_items > 0:
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successive_items = list_item_operator * (min_items - 1)
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min_items -= 1
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if max_items is not None and max_items > min_items:
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successive_items += (list_item_operator + "?") * (max_items - min_items - 1)
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else:
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successive_items += list_item_operator + "*"
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if min_items == 0:
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rule = f'"[" space ( {item_rule_name} {successive_items} )? "]" space'
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else:
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rule = f'"[" space {item_rule_name} {successive_items} "]" space'
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return self._add_rule(rule_name, rule)
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elif schema_type in (None, 'string') and 'pattern' in schema:
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return self._visit_pattern(schema['pattern'], rule_name)
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elif schema_type in (None, 'string') and re.match(r'^uuid[1-5]?$', schema_format or ''):
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return self._add_rule(
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'root' if rule_name == 'root' else schema_format,
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PRIMITIVE_RULES['uuid']
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)
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elif schema_type in (None, 'string') and schema_format in DATE_RULES:
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for t, r in DATE_RULES.items():
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self._add_rule(t, r)
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return schema_format + '-string'
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elif (schema_type == 'object') or (len(schema) == 0):
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for n in OBJECT_RULE_NAMES:
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self._add_rule(n, PRIMITIVE_RULES[n])
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return self._add_rule(rule_name, 'object')
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else:
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assert schema_type in PRIMITIVE_RULES, f'Unrecognized schema: {schema}'
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# TODO: support minimum, maximum, exclusiveMinimum, exclusiveMaximum at least for zero
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return self._add_rule(
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'root' if rule_name == 'root' else schema_type,
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PRIMITIVE_RULES[schema_type]
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)
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def _build_object_rule(self, properties: List[Tuple[str, Any]], required: Set[str], name: str, additional_properties: Union[bool, Any]):
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prop_order = self._prop_order
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# sort by position in prop_order (if specified) then by original order
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sorted_props = [kv[0] for _, kv in sorted(enumerate(properties), key=lambda ikv: (prop_order.get(ikv[1][0], len(prop_order)), ikv[0]))]
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prop_kv_rule_names = {}
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for prop_name, prop_schema in properties:
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prop_rule_name = self.visit(prop_schema, f'{name}{"-" if name else ""}{prop_name}')
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prop_kv_rule_names[prop_name] = self._add_rule(
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f'{name}{"-" if name else ""}{prop_name}-kv',
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fr'{self._format_literal(json.dumps(prop_name))} space ":" space {prop_rule_name}'
|
|
)
|
|
required_props = [k for k in sorted_props if k in required]
|
|
optional_props = [k for k in sorted_props if k not in required]
|
|
|
|
if additional_properties == True or isinstance(additional_properties, dict):
|
|
sub_name = f'{name}{"-" if name else ""}additional'
|
|
value_rule = self.visit({} if additional_properties == True else additional_properties, f'{sub_name}-value')
|
|
prop_kv_rule_names["*"] = self._add_rule(
|
|
f'{sub_name}-kv',
|
|
self._add_rule('string', PRIMITIVE_RULES['string']) + f' ":" space {value_rule}'
|
|
)
|
|
optional_props.append("*")
|
|
|
|
rule = '"{" space '
|
|
rule += ' "," space '.join(prop_kv_rule_names[k] for k in required_props)
|
|
|
|
if optional_props:
|
|
rule += ' ('
|
|
if required_props:
|
|
rule += ' "," space ( '
|
|
|
|
def get_recursive_refs(ks, first_is_optional):
|
|
[k, *rest] = ks
|
|
kv_rule_name = prop_kv_rule_names[k]
|
|
if k == '*':
|
|
res = self._add_rule(
|
|
f'{name}{"-" if name else ""}additional-kvs',
|
|
f'{kv_rule_name} ( "," space ' + kv_rule_name + ' )*'
|
|
)
|
|
elif first_is_optional:
|
|
res = f'( "," space {kv_rule_name} )?'
|
|
else:
|
|
res = kv_rule_name
|
|
if len(rest) > 0:
|
|
res += ' ' + self._add_rule(
|
|
f'{name}{"-" if name else ""}{k}-rest',
|
|
get_recursive_refs(rest, first_is_optional=True)
|
|
)
|
|
return res
|
|
|
|
rule += ' | '.join(
|
|
get_recursive_refs(optional_props[i:], first_is_optional=False)
|
|
for i in range(len(optional_props))
|
|
)
|
|
if required_props:
|
|
rule += ' )'
|
|
rule += ' )?'
|
|
|
|
rule += ' "}" space'
|
|
|
|
return rule
|
|
|
|
def format_grammar(self):
|
|
return '\n'.join(
|
|
f'{name} ::= {rule}'
|
|
for name, rule in sorted(self._rules.items(), key=lambda kv: kv[0])
|
|
)
|
|
|
|
|
|
def main(args_in = None):
|
|
parser = argparse.ArgumentParser(
|
|
description='''
|
|
Generates a grammar (suitable for use in ./main) that produces JSON conforming to a
|
|
given JSON schema. Only a subset of JSON schema features are supported; more may be
|
|
added in the future.
|
|
''',
|
|
)
|
|
parser.add_argument(
|
|
'--prop-order',
|
|
default=[],
|
|
type=lambda s: s.split(','),
|
|
help='''
|
|
comma-separated property names defining the order of precedence for object properties;
|
|
properties not specified here are given lower precedence than those that are, and
|
|
are kept in their original order from the schema. Required properties are always
|
|
given precedence over optional properties.
|
|
'''
|
|
)
|
|
parser.add_argument(
|
|
'--allow-fetch',
|
|
action='store_true',
|
|
default=False,
|
|
help='Whether to allow fetching referenced schemas over HTTPS')
|
|
parser.add_argument(
|
|
'--dotall',
|
|
action='store_true',
|
|
default=False,
|
|
help='Whether to treat dot (".") as matching all chars including line breaks in regular expression patterns')
|
|
parser.add_argument(
|
|
'--raw-pattern',
|
|
action='store_true',
|
|
default=False,
|
|
help='Treats string patterns as raw patterns w/o quotes (or quote escapes)')
|
|
|
|
parser.add_argument('schema', help='file containing JSON schema ("-" for stdin)')
|
|
args = parser.parse_args(args_in)
|
|
|
|
if args.schema.startswith('https://'):
|
|
url = args.schema
|
|
import requests
|
|
schema = requests.get(url).json()
|
|
elif args.schema == '-':
|
|
url = 'stdin'
|
|
schema = json.load(sys.stdin)
|
|
else:
|
|
url = f'file://{args.schema}'
|
|
with open(args.schema) as f:
|
|
schema = json.load(f)
|
|
converter = SchemaConverter(
|
|
prop_order={name: idx for idx, name in enumerate(args.prop_order)},
|
|
allow_fetch=args.allow_fetch,
|
|
dotall=args.dotall,
|
|
raw_pattern=args.raw_pattern)
|
|
schema = converter.resolve_refs(schema, url)
|
|
converter.visit(schema, '')
|
|
print(converter.format_grammar())
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|