From: Olivier Chafik Date: Fri, 12 Apr 2024 18:43:38 +0000 (+0100) Subject: JSON schema conversion: ⚡️ faster repetitions, min/maxLength for strings, cap number... X-Git-Tag: upstream/0.0.4488~1823 X-Git-Url: https://git.djapps.eu/?a=commitdiff_plain;h=ab9a3240a9da941fdef5cd4a25f2b97c2f5a67aa;p=pkg%2Fggml%2Fsources%2Fllama.cpp JSON schema conversion: ⚡️ faster repetitions, min/maxLength for strings, cap number length (#6555) * json: rename python schema converter to make import easier * server: skip null json_schema / grammar fields * json: deps management for primitive rules (+ allow null values) * json: optimize repetitions for minItems/maxItems and regexps: `a{,3}` goes from `"a"? "a"? "a"?` (explosive combos) to `(a (a (a)?)?)?` * grammars: add troubleshooting section to readme * json: cap length of numbers to 15 digits before/after decimal point (avoids infinite gen, e.g. "one third" -> `0.333333333333...`) * json: unify all repetition code (w/ or w/o sep) * json: support string minLength/maxLength * server+json: update server/README w/ result_format * nits * json: fix type error w/ python 3.8 * json: fix server/README (json_schema in /completion vs. result_format in /v1/chat/completions) * json: simplify DOT `{"type": "string", "pattern": "^.$"}` * json: remove recursion in opt_repetitions (avoids Python stack overflow) * json: rm dead code * json: rm useless assert & ggml.h import --- diff --git a/common/json-schema-to-grammar.cpp b/common/json-schema-to-grammar.cpp index 0e468034..0f8f1b1d 100644 --- a/common/json-schema-to-grammar.cpp +++ b/common/json-schema-to-grammar.cpp @@ -11,35 +11,101 @@ using json = nlohmann::ordered_json; +template +static std::string join(Iterator begin, Iterator end, const std::string & separator); + +static std::string repeat(const std::string & str, size_t n); + +static std::string build_repetition(const std::string & item_rule, int min_items, int max_items, const std::string & separator_rule = "", bool item_rule_is_literal = false) { + if (separator_rule.empty()) { + if (min_items == 0 && max_items == 1) { + return item_rule + "?"; + } else if (min_items == 1 && max_items == std::numeric_limits::max()) { + return item_rule + "+"; + } + } + + std::string result; + if (min_items > 0) { + if (item_rule_is_literal && separator_rule.empty()) { + result = "\"" + repeat(std::string(item_rule.begin() + 1, item_rule.end() - 1), min_items) + "\""; + } else { + std::vector items(min_items, item_rule); + result = join(items.begin(), items.end(), separator_rule.empty() ? " " : " " + separator_rule + " "); + } + } + + std::function opt_repetitions = [&](int up_to_n, bool prefix_with_sep) -> std::string { + auto content = prefix_with_sep && !separator_rule.empty() ? separator_rule + " " + item_rule : item_rule; + + if (up_to_n == 0) { + return ""; + } else if (up_to_n == 1) { + return "(" + content + ")?"; + } else if (!separator_rule.empty() && !prefix_with_sep) { + return "(" + content + " " + opt_repetitions(up_to_n - 1, true) + ")?"; + } else { + std::string res = repeat("(" + content + " ", up_to_n); + // strip trailing space + res = res.substr(0, res.length() - 1); + res += repeat(")?", up_to_n); + return res; + } + }; + + if (min_items > 0 && max_items != min_items) { + result += " "; + } + + if (max_items != std::numeric_limits::max()) { + result += opt_repetitions(max_items - min_items, min_items > 0); + } else { + std::string item_operator = "(" + (separator_rule.empty() ? "" : separator_rule + " ") + item_rule + ")"; + if (min_items == 0 && !separator_rule.empty()) { + result = "(" + item_rule + " " + item_operator + "*)?"; + } else { + result += item_operator + "*"; + } + } + + return result; +} + const std::string SPACE_RULE = "\" \"?"; -std::unordered_map PRIMITIVE_RULES = { - {"boolean", "(\"true\" | \"false\") space"}, - {"number", "(\"-\"? ([0-9] | [1-9] [0-9]*)) (\".\" [0-9]+)? ([eE] [-+]? [0-9]+)? space"}, - {"integer", "(\"-\"? ([0-9] | [1-9] [0-9]*)) space"}, - {"value", "object | array | string | number | boolean"}, - {"object", "\"{\" space ( string \":\" space value (\",\" space string \":\" space value)* )? \"}\" space"}, - {"array", "\"[\" space ( value (\",\" space value)* )? \"]\" space"}, - {"uuid", "\"\\\"\" [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] " +struct BuiltinRule { + std::string content; + std::vector deps; +}; + +const std::string _up_to_15_digits = build_repetition("[0-9]", 0, 15); + +std::unordered_map PRIMITIVE_RULES = { + {"boolean", {"(\"true\" | \"false\") space", {}}}, + {"decimal-part", {"[0-9] " + _up_to_15_digits, {}}}, + {"integral-part", {"[0-9] | [1-9] " + _up_to_15_digits, {}}}, + {"number", {"(\"-\"? integral-part) (\".\" decimal-part)? ([eE] [-+]? integral-part)? space", {"integral-part", "decimal-part"}}}, + {"integer", {"(\"-\"? integral-part) space", {"integral-part"}}}, + {"value", {"object | array | string | number | boolean | null", {"object", "array", "string", "number", "boolean", "null"}}}, + {"object", {"\"{\" space ( string \":\" space value (\",\" space string \":\" space value)* )? \"}\" space", {"string", "value"}}}, + {"array", {"\"[\" space ( value (\",\" space value)* )? \"]\" space", {"value"}}}, + {"uuid", {"\"\\\"\" [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] " "\"-\" [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] " "\"-\" [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] " "\"-\" [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] " - "\"-\" [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] \"\\\"\" space"}, - {"string", " \"\\\"\" (\n" - " [^\"\\\\] |\n" - " \"\\\\\" ([\"\\\\/bfnrt] | \"u\" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])\n" - " )* \"\\\"\" space"}, - {"null", "\"null\" space"} + "\"-\" [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F] \"\\\"\" space", {}}}, + {"char", {"[^\"\\\\] | \"\\\\\" ([\"\\\\/bfnrt] | \"u\" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])", {}}}, + {"string", {"\"\\\"\" char* \"\\\"\" space", {"char"}}}, + {"null", {"\"null\" space", {}}}, }; -std::vector OBJECT_RULE_NAMES = {"object", "array", "string", "number", "boolean", "null", "value"}; - -std::unordered_map DATE_RULES = { - {"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] )"}, - {"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] )"}, - {"date-time", "date \"T\" time"}, - {"date-string", "\"\\\"\" date \"\\\"\" space"}, - {"time-string", "\"\\\"\" time \"\\\"\" space"}, - {"date-time-string", "\"\\\"\" date-time \"\\\"\" space"} + +std::unordered_map STRING_FORMAT_RULES = { + {"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] )", {}}}, + {"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] )", {}}}, + {"date-time", {"date \"T\" time", {"date", "time"}}}, + {"date-string", {"\"\\\"\" date \"\\\"\" space", {"date"}}}, + {"time-string", {"\"\\\"\" time \"\\\"\" space", {"time"}}}, + {"date-time-string", {"\"\\\"\" date-time \"\\\"\" space", {"date-time"}}} }; static bool is_reserved_name(const std::string & name) { @@ -47,7 +113,7 @@ static bool is_reserved_name(const std::string & name) { if (RESERVED_NAMES.empty()) { RESERVED_NAMES.insert("root"); for (const auto &p : PRIMITIVE_RULES) RESERVED_NAMES.insert(p.first); - for (const auto &p : DATE_RULES) RESERVED_NAMES.insert(p.first); + for (const auto &p : STRING_FORMAT_RULES) RESERVED_NAMES.insert(p.first); } return RESERVED_NAMES.find(name) != RESERVED_NAMES.end(); } @@ -192,7 +258,7 @@ private: if (_dotall) { rule = "[\\U00000000-\\U0010FFFF]"; } else { - rule = "[\\U00000000-\\x09\\x0B\\x0C\\x0E-\\U0010FFFF]"; + rule = "[^\\x0A\\x0D]"; } return _add_rule("dot", rule); }; @@ -308,47 +374,21 @@ private: auto &sub = last.first; auto sub_is_literal = last.second; - if (min_times == 0 && max_times == std::numeric_limits::max()) { - sub += "*"; - } else if (min_times == 0 && max_times == 1) { - sub += "?"; - } else if (min_times == 1 && max_times == std::numeric_limits::max()) { - sub += "+"; - } else { - if (!sub_is_literal) { - std::string & sub_id = sub_rule_ids[sub]; - if (sub_id.empty()) { - sub_id = _add_rule(name + "-" + std::to_string(sub_rule_ids.size()), sub); - } - sub = sub_id; - } - std::string result; - if (sub_is_literal && min_times > 0) { - result = "\"" + repeat(sub.substr(1, sub.length() - 2), min_times) + "\""; - } else { - for (int j = 0; j < min_times; j++) { - if (j > 0) { - result += " "; - } - result += sub; - } - } - if (min_times > 0 && min_times < max_times) { - result += " "; + if (!sub_is_literal) { + std::string & sub_id = sub_rule_ids[sub]; + if (sub_id.empty()) { + sub_id = _add_rule(name + "-" + std::to_string(sub_rule_ids.size()), sub); } - if (max_times == std::numeric_limits::max()) { - result += sub + "*"; - } else { - for (int j = min_times; j < max_times; j++) { - if (j > min_times) { - result += " "; - } - result += sub + "?"; - } - } - seq.back().first = result; - seq.back().second = false; + sub = sub_id; } + seq.back().first = build_repetition( + sub_is_literal ? "\"" + sub + "\"" : sub, + min_times, + max_times, + "", + sub_is_literal + ); + seq.back().second = false; } else { std::string literal; auto is_non_literal = [&](char c) { @@ -424,7 +464,7 @@ private: if (additional_properties.is_object() || (additional_properties.is_boolean() && additional_properties.get())) { std::string sub_name = name + (name.empty() ? "" : "-") + "additional"; std::string value_rule = visit(additional_properties.is_object() ? additional_properties : json::object(), sub_name + "-value"); - std::string kv_rule = _add_rule(sub_name + "-kv", _add_rule("string", PRIMITIVE_RULES.at("string")) + " \":\" space " + value_rule); + std::string kv_rule = _add_rule(sub_name + "-kv", _add_primitive("string", PRIMITIVE_RULES.at("string")) + " \":\" space " + value_rule); prop_kv_rule_names["*"] = kv_rule; optional_props.push_back("*"); } @@ -486,6 +526,25 @@ private: return rule; } + std::string _add_primitive(const std::string & name, const BuiltinRule & rule) { + auto n = _add_rule(name, rule.content); + for (const auto & dep : rule.deps) { + BuiltinRule dep_rule; + auto it = PRIMITIVE_RULES.find(dep); + if (it == PRIMITIVE_RULES.end()) { + it = STRING_FORMAT_RULES.find(dep); + if (it == STRING_FORMAT_RULES.end()) { + _errors.push_back("Rule " + dep + " not known"); + continue; + } + } + if (_rules.find(dep) == _rules.end()) { + _add_primitive(dep, it->second); + } + } + return n; + } + public: SchemaConverter( const std::function & fetch_json, @@ -647,49 +706,33 @@ public: return _add_rule(rule_name, rule); } else { std::string item_rule_name = visit(items, name + (name.empty() ? "" : "-") + "item"); - std::string list_item_operator = "( \",\" space " + item_rule_name + " )"; - std::string successive_items; int min_items = schema.contains("minItems") ? schema["minItems"].get() : 0; json max_items_json = schema.contains("maxItems") ? schema["maxItems"] : json(); - int max_items = max_items_json.is_number_integer() ? max_items_json.get() : -1; - if (min_items > 0) { - successive_items += repeat(list_item_operator, min_items - 1); - min_items--; - } - if (max_items >= 0 && max_items > min_items) { - successive_items += repeat(list_item_operator + "?", max_items - min_items - 1); - } else { - successive_items += list_item_operator + "*"; - } - std::string rule; - if (min_items == 0) { - rule = "\"[\" space ( " + item_rule_name + " " + successive_items + " )? \"]\" space"; - } else { - rule = "\"[\" space " + item_rule_name + " " + successive_items + " \"]\" space"; - } - return _add_rule(rule_name, rule); + int max_items = max_items_json.is_number_integer() ? max_items_json.get() : std::numeric_limits::max(); + + return _add_rule(rule_name, "\"[\" space " + build_repetition(item_rule_name, min_items, max_items, "\",\" space") + " \"]\" space"); } } else if ((schema_type.is_null() || schema_type == "string") && schema.contains("pattern")) { return _visit_pattern(schema["pattern"], rule_name); } else if ((schema_type.is_null() || schema_type == "string") && std::regex_match(schema_format, std::regex("^uuid[1-5]?$"))) { - return _add_rule(rule_name == "root" ? "root" : schema_format, PRIMITIVE_RULES.at("uuid")); - } else if ((schema_type.is_null() || schema_type == "string") && DATE_RULES.find(schema_format) != DATE_RULES.end()) { - for (const auto & kv : DATE_RULES) { - _add_rule(kv.first, kv.second); - } - return schema_format + "-string"; + return _add_primitive(rule_name == "root" ? "root" : schema_format, PRIMITIVE_RULES.at("uuid")); + } else if ((schema_type.is_null() || schema_type == "string") && STRING_FORMAT_RULES.find(schema_format + "-string") != STRING_FORMAT_RULES.end()) { + auto prim_name = schema_format + "-string"; + return _add_rule(rule_name, _add_primitive(prim_name, STRING_FORMAT_RULES.at(prim_name))); + } else if (schema_type == "string" && (schema.contains("minLength") || schema.contains("maxLength"))) { + std::string char_rule = _add_primitive("char", PRIMITIVE_RULES.at("char")); + int min_len = schema.contains("minLength") ? schema["minLength"].get() : 0; + int max_len = schema.contains("maxLength") ? schema["maxLength"].get() : std::numeric_limits::max(); + return _add_rule(rule_name, "\"\\\"\" " + build_repetition(char_rule, min_len, max_len) + " \"\\\"\" space"); } else if (schema.empty() || schema_type == "object") { - for (const auto & n : OBJECT_RULE_NAMES) { - _add_rule(n, PRIMITIVE_RULES.at(n)); - } - return _add_rule(rule_name, "object"); + return _add_rule(rule_name, _add_primitive("object", PRIMITIVE_RULES.at("object"))); } else { if (!schema_type.is_string() || PRIMITIVE_RULES.find(schema_type.get()) == PRIMITIVE_RULES.end()) { _errors.push_back("Unrecognized schema: " + schema.dump()); return ""; } // TODO: support minimum, maximum, exclusiveMinimum, exclusiveMaximum at least for zero - return _add_rule(rule_name == "root" ? "root" : schema_type.get(), PRIMITIVE_RULES.at(schema_type.get())); + return _add_primitive(rule_name == "root" ? "root" : schema_type.get(), PRIMITIVE_RULES.at(schema_type.get())); } } diff --git a/examples/json-schema-to-grammar.py b/examples/json-schema-to-grammar.py deleted file mode 100755 index 91dd734c..00000000 --- a/examples/json-schema-to-grammar.py +++ /dev/null @@ -1,550 +0,0 @@ -#!/usr/bin/env python3 -import argparse -import itertools -import json -import re -import sys -from typing import Any, Dict, List, Set, Tuple, Union - -# whitespace is constrained to a single space char to prevent model "running away" in -# whitespace. Also maybe improves generation quality? -SPACE_RULE = '" "?' - -PRIMITIVE_RULES = { - 'boolean': '("true" | "false") space', - 'number': '("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space', - 'integer': '("-"? ([0-9] | [1-9] [0-9]*)) space', - 'value' : 'object | array | string | number | boolean', - 'object' : '"{" space ( string ":" space value ("," space string ":" space value)* )? "}" space', - 'array' : '"[" space ( value ("," space value)* )? "]" space', - 'uuid' : '"\\"" ' + ' "-" '.join('[0-9a-fA-F]' * n for n in [8, 4, 4, 4, 12]) + ' "\\"" space', - 'string': r''' "\"" ( - [^"\\] | - "\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) - )* "\"" space''', - 'null': '"null" space', -} -OBJECT_RULE_NAMES = ['object', 'array', 'string', 'number', 'boolean', 'null', 'value'] - -# TODO: support "uri", "email" string formats -DATE_RULES = { - '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] )', - '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] )', - 'date-time': 'date "T" time', - 'date-string': '"\\"" date "\\"" space', - 'time-string': '"\\"" time "\\"" space', - 'date-time-string': '"\\"" date-time "\\"" space', -} - -RESERVED_NAMES = set(["root", *PRIMITIVE_RULES.keys(), *DATE_RULES.keys()]) - -INVALID_RULE_CHARS_RE = re.compile(r'[^a-zA-Z0-9-]+') -GRAMMAR_LITERAL_ESCAPE_RE = re.compile(r'[\r\n"]') -GRAMMAR_RANGE_LITERAL_ESCAPE_RE = re.compile(r'[\r\n"\]\-\\]') -GRAMMAR_LITERAL_ESCAPES = {'\r': '\\r', '\n': '\\n', '"': '\\"', '-': '\\-', ']': '\\]'} - -NON_LITERAL_SET = set('|.()[]{}*+?') -ESCAPED_IN_REGEXPS_BUT_NOT_IN_LITERALS = set('[]()|{}*+?') - -DATE_PATTERN = '[0-9]{4}-(0[1-9]|1[0-2])-([0-2][0-9]|3[0-1])' -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 - -class SchemaConverter: - def __init__(self, *, prop_order, allow_fetch, dotall, raw_pattern): - self._prop_order = prop_order - self._allow_fetch = allow_fetch - self._dotall = dotall - self._raw_pattern = raw_pattern - self._rules = {'space': SPACE_RULE} - self._refs = {} - self._refs_being_resolved = set() - - def _format_literal(self, literal): - escaped = GRAMMAR_LITERAL_ESCAPE_RE.sub( - lambda m: GRAMMAR_LITERAL_ESCAPES.get(m.group(0)), literal - ) - return f'"{escaped}"' - - def _add_rule(self, name, rule): - esc_name = INVALID_RULE_CHARS_RE.sub('-', name) - if esc_name not in self._rules or self._rules[esc_name] == rule: - key = esc_name - else: - i = 0 - while f'{esc_name}{i}' in self._rules and self._rules[f'{esc_name}{i}'] != rule: - i += 1 - key = f'{esc_name}{i}' - self._rules[key] = rule - return key - - def resolve_refs(self, schema: dict, url: str): - ''' - Resolves all $ref fields in the given schema, fetching any remote schemas, - replacing $ref with absolute reference URL and populating self._refs with the - respective referenced (sub)schema dictionaries. - ''' - def visit(n: dict): - if isinstance(n, list): - return [visit(x) for x in n] - elif isinstance(n, dict): - ref = n.get('$ref') - if ref is not None and ref not in self._refs: - if ref.startswith('https://'): - assert self._allow_fetch, 'Fetching remote schemas is not allowed (use --allow-fetch for force)' - import requests - - frag_split = ref.split('#') - base_url = frag_split[0] - - target = self._refs.get(base_url) - if target is None: - target = self.resolve_refs(requests.get(ref).json(), base_url) - self._refs[base_url] = target - - if len(frag_split) == 1 or frag_split[-1] == '': - return target - elif ref.startswith('#/'): - target = schema - ref = f'{url}{ref}' - n['$ref'] = ref - else: - raise ValueError(f'Unsupported ref {ref}') - - for sel in ref.split('#')[-1].split('/')[1:]: - assert target is not None and sel in target, f'Error resolving ref {ref}: {sel} not in {target}' - target = target[sel] - - self._refs[ref] = target - else: - for v in n.values(): - visit(v) - - return n - return visit(schema) - - def _generate_union_rule(self, name, alt_schemas): - return ' | '.join(( - self.visit(alt_schema, f'{name}{"-" if name else "alternative-"}{i}') - for i, alt_schema in enumerate(alt_schemas) - )) - - def _visit_pattern(self, pattern, name): - ''' - Transforms a regular expression pattern into a GBNF rule. - - Input: https://json-schema.org/understanding-json-schema/reference/regular_expressions - Output: https://github.com/ggerganov/llama.cpp/blob/master/grammars/README.md - - Unsupported features: negative/positive lookaheads, greedy/non-greedy modifiers. - - Mostly a 1:1 translation, except for {x} / {x,} / {x,y} quantifiers for which - we define sub-rules to keep the output lean. - ''' - - assert pattern.startswith('^') and pattern.endswith('$'), 'Pattern must start with "^" and end with "$"' - pattern = pattern[1:-1] - sub_rule_ids = {} - - i = 0 - length = len(pattern) - - def to_rule(s: Tuple[str, bool]) -> str: - (txt, is_literal) = s - return "\"" + txt + "\"" if is_literal else txt - - def transform() -> Tuple[str, bool]: - ''' - Parse a unit at index i (advancing it), and return its string representation + whether it's a literal. - ''' - nonlocal i - nonlocal pattern - nonlocal sub_rule_ids - - start = i - # For each component of this sequence, store its string representation and whether it's a literal. - # We only need a flat structure here to apply repetition operators to the last item, and - # to merge literals at the and (we're parsing grouped ( sequences ) recursively and don't treat '|' specially - # (GBNF's syntax is luckily very close to regular expressions!) - seq: list[Tuple[str, bool]] = [] - - def get_dot(): - if self._dotall: - rule = '[\\U00000000-\\U0010FFFF]' - else: - # Accept any character... except \n and \r line break chars (\x0A and \xOD) - rule = '[\\U00000000-\\x09\\x0B\\x0C\\x0E-\\U0010FFFF]' - return self._add_rule(f'dot', rule) - - def join_seq(): - nonlocal seq - ret = [] - for is_literal, g in itertools.groupby(seq, lambda x: x[1]): - if is_literal: - ret.append((''.join(x[0] for x in g), True)) - else: - ret.extend(g) - if len(ret) == 1: - return ret[0] - return (' '.join(to_rule(x) for x in seq), False) - - while i < length: - c = pattern[i] - if c == '.': - seq.append((get_dot(), False)) - i += 1 - elif c == '(': - i += 1 - if i < length: - assert pattern[i] != '?', f'Unsupported pattern syntax "{pattern[i]}" at index {i} of /{pattern}/' - seq.append((f'({to_rule(transform())})', False)) - elif c == ')': - i += 1 - assert start > 0 and pattern[start-1] == '(', f'Unbalanced parentheses; start = {start}, i = {i}, pattern = {pattern}' - return join_seq() - elif c == '[': - square_brackets = c - i += 1 - while i < length and pattern[i] != ']': - if pattern[i] == '\\': - square_brackets += pattern[i:i+2] - i += 2 - else: - square_brackets += pattern[i] - i += 1 - assert i < length, f'Unbalanced square brackets; start = {start}, i = {i}, pattern = {pattern}' - square_brackets += ']' - i += 1 - seq.append((square_brackets, False)) - elif c == '|': - seq.append(('|', False)) - i += 1 - elif c in ('*', '+', '?'): - seq[-1] = (to_rule(seq[-1]) + c, False) - i += 1 - elif c == '{': - curly_brackets = c - i += 1 - while i < length and pattern[i] != '}': - curly_brackets += pattern[i] - i += 1 - assert i < length, f'Unbalanced curly brackets; start = {start}, i = {i}, pattern = {pattern}' - curly_brackets += '}' - i += 1 - nums = [s.strip() for s in curly_brackets[1:-1].split(',')] - min_times = 0 - max_times = None - try: - if len(nums) == 1: - min_times = int(nums[0]) - max_times = min_times - else: - assert len(nums) == 2 - min_times = int(nums[0]) if nums[0] else 0 - max_times = int(nums[1]) if nums[1] else None - except ValueError: - raise ValueError(f'Invalid quantifier {curly_brackets} in /{pattern}/') - - (sub, sub_is_literal) = seq[-1] - - if min_times == 0 and max_times is None: - seq[-1] = (f'{sub}*', False) - elif min_times == 0 and max_times == 1: - seq[-1] = (f'{sub}?', False) - elif min_times == 1 and max_times is None: - seq[-1] = (f'{sub}+', False) - else: - if not sub_is_literal: - 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 - - seq[-1] = ( - ' '.join( - ([f'"{sub[1:-1] * min_times}"'] if sub_is_literal else [sub] * min_times) + - ([f'{sub}?'] * (max_times - min_times) if max_times is not None else [f'{sub}*'])), - False - ) - else: - literal = '' - while i < length: - if pattern[i] == '\\' and i < length - 1: - next = pattern[i + 1] - if next in ESCAPED_IN_REGEXPS_BUT_NOT_IN_LITERALS: - i += 1 - literal += pattern[i] - i += 1 - else: - literal += pattern[i:i+2] - i += 2 - elif pattern[i] == '"' and not self._raw_pattern: - literal += '\\"' - i += 1 - elif pattern[i] not in NON_LITERAL_SET and \ - (i == length - 1 or literal == '' or pattern[i+1] == '.' or pattern[i+1] not in NON_LITERAL_SET): - literal += pattern[i] - i += 1 - else: - break - if literal: - seq.append((literal, True)) - - return join_seq() - - return self._add_rule( - name, - to_rule(transform()) if self._raw_pattern \ - else "\"\\\"\" " + to_rule(transform()) + " \"\\\"\" space") - - - def _resolve_ref(self, ref): - ref_name = ref.split('/')[-1] - if ref_name not in self._rules and ref not in self._refs_being_resolved: - self._refs_being_resolved.add(ref) - resolved = self._refs[ref] - ref_name = self.visit(resolved, ref_name) - self._refs_being_resolved.remove(ref) - return ref_name - - def _generate_constant_rule(self, value): - return self._format_literal(json.dumps(value)) - - def visit(self, schema, name): - schema_type = schema.get('type') - schema_format = schema.get('format') - rule_name = name + '-' if name in RESERVED_NAMES else name or 'root' - - if (ref := schema.get('$ref')) is not None: - return self._add_rule(rule_name, self._resolve_ref(ref)) - - elif 'oneOf' in schema or 'anyOf' in schema: - return self._add_rule(rule_name, self._generate_union_rule(name, schema.get('oneOf') or schema['anyOf'])) - - elif isinstance(schema_type, list): - return self._add_rule(rule_name, self._generate_union_rule(name, [{'type': t} for t in schema_type])) - - elif 'const' in schema: - return self._add_rule(rule_name, self._generate_constant_rule(schema['const'])) - - elif 'enum' in schema: - rule = ' | '.join((self._generate_constant_rule(v) for v in schema['enum'])) - return self._add_rule(rule_name, rule) - - elif schema_type in (None, 'object') and \ - ('properties' in schema or \ - ('additionalProperties' in schema and schema['additionalProperties'] is not True)): - required = set(schema.get('required', [])) - properties = list(schema.get('properties', {}).items()) - return self._add_rule(rule_name, self._build_object_rule(properties, required, name, schema.get('additionalProperties'))) - - elif schema_type in (None, 'object') and 'allOf' in schema: - required = set() - properties = [] - hybrid_name = name - def add_component(comp_schema, is_required): - if (ref := comp_schema.get('$ref')) is not None: - comp_schema = self._refs[ref] - - if 'properties' in comp_schema: - for prop_name, prop_schema in comp_schema['properties'].items(): - properties.append((prop_name, prop_schema)) - if is_required: - required.add(prop_name) - - for t in schema['allOf']: - if 'anyOf' in t: - for tt in t['anyOf']: - add_component(tt, is_required=False) - else: - add_component(t, is_required=True) - - return self._add_rule(rule_name, self._build_object_rule(properties, required, hybrid_name, additional_properties=[])) - - elif schema_type in (None, 'array') and ('items' in schema or 'prefixItems' in schema): - items = schema.get('items') or schema['prefixItems'] - if isinstance(items, list): - return self._add_rule( - rule_name, - '"[" space ' + - ' "," space '.join( - self.visit(item, f'{name}{"-" if name else ""}tuple-{i}') - for i, item in enumerate(items)) + - ' "]" space') - else: - item_rule_name = self.visit(items, f'{name}{"-" if name else ""}item') - list_item_operator = f'( "," space {item_rule_name} )' - successive_items = "" - min_items = schema.get("minItems", 0) - max_items = schema.get("maxItems") - if min_items > 0: - successive_items = list_item_operator * (min_items - 1) - min_items -= 1 - if max_items is not None and max_items > min_items: - successive_items += (list_item_operator + "?") * (max_items - min_items - 1) - else: - successive_items += list_item_operator + "*" - if min_items == 0: - rule = f'"[" space ( {item_rule_name} {successive_items} )? "]" space' - else: - rule = f'"[" space {item_rule_name} {successive_items} "]" space' - return self._add_rule(rule_name, rule) - - elif schema_type in (None, 'string') and 'pattern' in schema: - return self._visit_pattern(schema['pattern'], rule_name) - - elif schema_type in (None, 'string') and re.match(r'^uuid[1-5]?$', schema_format or ''): - return self._add_rule( - 'root' if rule_name == 'root' else schema_format, - PRIMITIVE_RULES['uuid'] - ) - - elif schema_type in (None, 'string') and schema_format in DATE_RULES: - for t, r in DATE_RULES.items(): - self._add_rule(t, r) - return schema_format + '-string' - - elif (schema_type == 'object') or (len(schema) == 0): - for n in OBJECT_RULE_NAMES: - self._add_rule(n, PRIMITIVE_RULES[n]) - return self._add_rule(rule_name, 'object') - - else: - assert schema_type in PRIMITIVE_RULES, f'Unrecognized schema: {schema}' - # TODO: support minimum, maximum, exclusiveMinimum, exclusiveMaximum at least for zero - return self._add_rule( - 'root' if rule_name == 'root' else schema_type, - PRIMITIVE_RULES[schema_type] - ) - - def _build_object_rule(self, properties: List[Tuple[str, Any]], required: Set[str], name: str, additional_properties: Union[bool, Any]): - prop_order = self._prop_order - # sort by position in prop_order (if specified) then by original order - sorted_props = [kv[0] for _, kv in sorted(enumerate(properties), key=lambda ikv: (prop_order.get(ikv[1][0], len(prop_order)), ikv[0]))] - - prop_kv_rule_names = {} - for prop_name, prop_schema in properties: - prop_rule_name = self.visit(prop_schema, f'{name}{"-" if name else ""}{prop_name}') - prop_kv_rule_names[prop_name] = self._add_rule( - f'{name}{"-" if name else ""}{prop_name}-kv', - 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() diff --git a/examples/json_schema_to_grammar.py b/examples/json_schema_to_grammar.py new file mode 100755 index 00000000..826cd3f7 --- /dev/null +++ b/examples/json_schema_to_grammar.py @@ -0,0 +1,616 @@ +#!/usr/bin/env python3 +import argparse +import itertools +import json +import re +import sys +from typing import Any, Dict, List, Set, Tuple, Union + +def _build_repetition(item_rule, min_items, max_items, separator_rule=None, item_rule_is_literal=False): + if not separator_rule: + if min_items == 0 and max_items == 1: + return f'{item_rule}?' + elif min_items == 1 and max_items is None: + return f'{item_rule}+' + + result = '' + + if min_items > 0: + if item_rule_is_literal and separator_rule is None: + result = '"' + (item_rule[1:-1] * min_items) + '"' + else: + result = (f' {separator_rule} ' if separator_rule else ' ').join([item_rule] * min_items) + + def opt_repetitions(up_to_n, prefix_with_sep=False): + ''' + - n=4, no sep: '(a (a (a (a)?)?)?)?' + - n=4, sep=',', prefix: '("," a ("," a ("," a ("," a)?)?)?)?' + - n=4, sep=',', no prefix: '(a ("," a ("," a ("," a)?)?)?)?' + ''' + + content = f'{separator_rule} {item_rule}' if prefix_with_sep and separator_rule else item_rule + if up_to_n == 0: + return '' + elif up_to_n == 1: + return f'({content})?' + elif separator_rule and not prefix_with_sep: + return f'({content} {opt_repetitions(up_to_n - 1, prefix_with_sep=True)})?' + else: + return (f'({content} ' * up_to_n).rstrip() + (')?' * up_to_n) + + if min_items > 0 and max_items != min_items: + result += ' ' + + if max_items is not None: + result += opt_repetitions(max_items - min_items, prefix_with_sep=min_items > 0) + else: + item_operator = f'({separator_rule + " " if separator_rule else ""}{item_rule})' + + if min_items == 0 and separator_rule: + result = f'({item_rule} {item_operator}*)?' + else: + result += f'{item_operator}*' + + return result + + +class BuiltinRule: + def __init__(self, content: str, deps: list = None): + self.content = content + self.deps = deps or [] + +_up_to_15_digits = _build_repetition('[0-9]', 0, 15) + +# whitespace is constrained to a single space char to prevent model "running away" in +# whitespace. Also maybe improves generation quality? +SPACE_RULE = '" "?' + +PRIMITIVE_RULES = { + 'boolean' : BuiltinRule('("true" | "false") space', []), + 'decimal-part' : BuiltinRule('[0-9] ' + _up_to_15_digits, []), + 'integral-part': BuiltinRule('[0-9] | [1-9] ' + _up_to_15_digits, []), + 'number' : BuiltinRule('("-"? integral-part) ("." decimal-part)? ([eE] [-+]? integral-part)? space', ['integral-part', 'decimal-part']), + 'integer' : BuiltinRule('("-"? integral-part) space', ['integral-part']), + 'value' : BuiltinRule('object | array | string | number | boolean | null', ['object', 'array', 'string', 'number', 'boolean', 'null']), + 'object' : BuiltinRule('"{" space ( string ":" space value ("," space string ":" space value)* )? "}" space', ['string', 'value']), + 'array' : BuiltinRule('"[" space ( value ("," space value)* )? "]" space', ['value']), + 'uuid' : BuiltinRule(r'"\"" ' + ' "-" '.join('[0-9a-fA-F]' * n for n in [8, 4, 4, 4, 12]) + r' "\"" space', []), + 'char' : BuiltinRule(r'[^"\\] | "\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])', []), + 'string' : BuiltinRule(r'"\"" char* "\"" space', ['char']), + 'null' : BuiltinRule('"null" space', []), +} + +# TODO: support "uri", "email" string formats +STRING_FORMAT_RULES = { + 'date' : BuiltinRule('[0-9] [0-9] [0-9] [0-9] "-" ( "0" [1-9] | "1" [0-2] ) "-" ( \"0\" [1-9] | [1-2] [0-9] | "3" [0-1] )', []), + 'time' : BuiltinRule('([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] )', []), + 'date-time' : BuiltinRule('date "T" time', ['date', 'time']), + 'date-string' : BuiltinRule('"\\"" date "\\"" space', ['date']), + 'time-string' : BuiltinRule('"\\"" time "\\"" space', ['time']), + 'date-time-string': BuiltinRule('"\\"" date-time "\\"" space', ['date-time']), +} + +DOTALL = '[\\U00000000-\\U0010FFFF]' +DOT = '[^\\x0A\\x0D]' + +RESERVED_NAMES = set(["root", "dot", *PRIMITIVE_RULES.keys(), *STRING_FORMAT_RULES.keys()]) + +INVALID_RULE_CHARS_RE = re.compile(r'[^a-zA-Z0-9-]+') +GRAMMAR_LITERAL_ESCAPE_RE = re.compile(r'[\r\n"]') +GRAMMAR_RANGE_LITERAL_ESCAPE_RE = re.compile(r'[\r\n"\]\-\\]') +GRAMMAR_LITERAL_ESCAPES = {'\r': '\\r', '\n': '\\n', '"': '\\"', '-': '\\-', ']': '\\]'} + +NON_LITERAL_SET = set('|.()[]{}*+?') +ESCAPED_IN_REGEXPS_BUT_NOT_IN_LITERALS = set('[]()|{}*+?') + + +class SchemaConverter: + def __init__(self, *, prop_order, allow_fetch, dotall, raw_pattern): + self._prop_order = prop_order + self._allow_fetch = allow_fetch + self._dotall = dotall + self._raw_pattern = raw_pattern + self._rules = { + 'space': SPACE_RULE, + } + self._refs = {} + self._refs_being_resolved = set() + + def _format_literal(self, literal): + escaped = GRAMMAR_LITERAL_ESCAPE_RE.sub( + lambda m: GRAMMAR_LITERAL_ESCAPES.get(m.group(0)), literal + ) + return f'"{escaped}"' + + def not_literal(self, literal: str, dotall: bool = True, maybe_escaped_underscores = False) -> str: + ''' + not_literal('a') -> '[^a]' + not_literal('abc') -> '([^a] | "a" ([^b] | "b" ([^c])?)?)?' + ''' + assert len(literal) > 0, 'Empty literal not supported' + def recurse(i: int): + c = literal[i] + if maybe_escaped_underscores and c == '_': + yield f'[^{c}\\\\]' + yield ' | ' + yield f'"\\\\"? "{c}"' + else: + yield f'[^{c}]' + if i < len(literal) - 1: + yield ' | ' + yield self._format_literal(c) + yield ' (' + yield from recurse(i + 1) + yield ')?' + + return ''.join(('(', *recurse(0), ')')) + + def _add_rule(self, name, rule): + esc_name = INVALID_RULE_CHARS_RE.sub('-', name) + if esc_name not in self._rules or self._rules[esc_name] == rule: + key = esc_name + else: + i = 0 + while f'{esc_name}{i}' in self._rules and self._rules[f'{esc_name}{i}'] != rule: + i += 1 + key = f'{esc_name}{i}' + self._rules[key] = rule + return key + + def resolve_refs(self, schema: dict, url: str): + ''' + Resolves all $ref fields in the given schema, fetching any remote schemas, + replacing $ref with absolute reference URL and populating self._refs with the + respective referenced (sub)schema dictionaries. + ''' + def visit(n: dict): + if isinstance(n, list): + return [visit(x) for x in n] + elif isinstance(n, dict): + ref = n.get('$ref') + if ref is not None and ref not in self._refs: + if ref.startswith('https://'): + assert self._allow_fetch, 'Fetching remote schemas is not allowed (use --allow-fetch for force)' + import requests + + frag_split = ref.split('#') + base_url = frag_split[0] + + target = self._refs.get(base_url) + if target is None: + target = self.resolve_refs(requests.get(ref).json(), base_url) + self._refs[base_url] = target + + if len(frag_split) == 1 or frag_split[-1] == '': + return target + elif ref.startswith('#/'): + target = schema + ref = f'{url}{ref}' + n['$ref'] = ref + else: + raise ValueError(f'Unsupported ref {ref}') + + for sel in ref.split('#')[-1].split('/')[1:]: + assert target is not None and sel in target, f'Error resolving ref {ref}: {sel} not in {target}' + target = target[sel] + + self._refs[ref] = target + else: + for v in n.values(): + visit(v) + + return n + return visit(schema) + + def _generate_union_rule(self, name, alt_schemas): + return ' | '.join(( + self.visit(alt_schema, f'{name}{"-" if name else "alternative-"}{i}') + for i, alt_schema in enumerate(alt_schemas) + )) + + def _visit_pattern(self, pattern, name): + ''' + Transforms a regular expression pattern into a GBNF rule. + + Input: https://json-schema.org/understanding-json-schema/reference/regular_expressions + Output: https://github.com/ggerganov/llama.cpp/blob/master/grammars/README.md + + Unsupported features: negative/positive lookaheads, greedy/non-greedy modifiers. + + Mostly a 1:1 translation, except for {x} / {x,} / {x,y} quantifiers for which + we define sub-rules to keep the output lean. + ''' + + assert pattern.startswith('^') and pattern.endswith('$'), 'Pattern must start with "^" and end with "$"' + pattern = pattern[1:-1] + sub_rule_ids = {} + + i = 0 + length = len(pattern) + + def to_rule(s: Tuple[str, bool]) -> str: + (txt, is_literal) = s + return "\"" + txt + "\"" if is_literal else txt + + def transform() -> Tuple[str, bool]: + ''' + Parse a unit at index i (advancing it), and return its string representation + whether it's a literal. + ''' + nonlocal i + nonlocal pattern + nonlocal sub_rule_ids + + start = i + # For each component of this sequence, store its string representation and whether it's a literal. + # We only need a flat structure here to apply repetition operators to the last item, and + # to merge literals at the and (we're parsing grouped ( sequences ) recursively and don't treat '|' specially + # (GBNF's syntax is luckily very close to regular expressions!) + seq: list[Tuple[str, bool]] = [] + + def get_dot(): + if self._dotall: + rule = DOTALL + else: + # Accept any character... except \n and \r line break chars (\x0A and \xOD) + rule = DOT + return self._add_rule(f'dot', rule) + + def join_seq(): + nonlocal seq + ret = [] + for is_literal, g in itertools.groupby(seq, lambda x: x[1]): + if is_literal: + ret.append((''.join(x[0] for x in g), True)) + else: + ret.extend(g) + if len(ret) == 1: + return ret[0] + return (' '.join(to_rule(x) for x in seq), False) + + while i < length: + c = pattern[i] + if c == '.': + seq.append((get_dot(), False)) + i += 1 + elif c == '(': + i += 1 + if i < length: + assert pattern[i] != '?', f'Unsupported pattern syntax "{pattern[i]}" at index {i} of /{pattern}/' + seq.append((f'({to_rule(transform())})', False)) + elif c == ')': + i += 1 + assert start > 0 and pattern[start-1] == '(', f'Unbalanced parentheses; start = {start}, i = {i}, pattern = {pattern}' + return join_seq() + elif c == '[': + square_brackets = c + i += 1 + while i < length and pattern[i] != ']': + if pattern[i] == '\\': + square_brackets += pattern[i:i+2] + i += 2 + else: + square_brackets += pattern[i] + i += 1 + assert i < length, f'Unbalanced square brackets; start = {start}, i = {i}, pattern = {pattern}' + square_brackets += ']' + i += 1 + seq.append((square_brackets, False)) + elif c == '|': + seq.append(('|', False)) + i += 1 + elif c in ('*', '+', '?'): + seq[-1] = (to_rule(seq[-1]) + c, False) + i += 1 + elif c == '{': + curly_brackets = c + i += 1 + while i < length and pattern[i] != '}': + curly_brackets += pattern[i] + i += 1 + assert i < length, f'Unbalanced curly brackets; start = {start}, i = {i}, pattern = {pattern}' + curly_brackets += '}' + i += 1 + nums = [s.strip() for s in curly_brackets[1:-1].split(',')] + min_times = 0 + max_times = None + try: + if len(nums) == 1: + min_times = int(nums[0]) + max_times = min_times + else: + assert len(nums) == 2 + min_times = int(nums[0]) if nums[0] else 0 + max_times = int(nums[1]) if nums[1] else None + except ValueError: + raise ValueError(f'Invalid quantifier {curly_brackets} in /{pattern}/') + + (sub, sub_is_literal) = seq[-1] + + if not sub_is_literal: + 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 + + seq[-1] = (_build_repetition(f'"{sub}"' if sub_is_literal else sub, min_times, max_times, item_rule_is_literal=sub_is_literal), False) + else: + literal = '' + while i < length: + if pattern[i] == '\\' and i < length - 1: + next = pattern[i + 1] + if next in ESCAPED_IN_REGEXPS_BUT_NOT_IN_LITERALS: + i += 1 + literal += pattern[i] + i += 1 + else: + literal += pattern[i:i+2] + i += 2 + elif pattern[i] == '"' and not self._raw_pattern: + literal += '\\"' + i += 1 + elif pattern[i] not in NON_LITERAL_SET and \ + (i == length - 1 or literal == '' or pattern[i+1] == '.' or pattern[i+1] not in NON_LITERAL_SET): + literal += pattern[i] + i += 1 + else: + break + if literal: + seq.append((literal, True)) + + return join_seq() + + return self._add_rule( + name, + to_rule(transform()) if self._raw_pattern \ + else "\"\\\"\" " + to_rule(transform()) + " \"\\\"\" space") + + + def _resolve_ref(self, ref): + ref_name = ref.split('/')[-1] + if ref_name not in self._rules and ref not in self._refs_being_resolved: + self._refs_being_resolved.add(ref) + resolved = self._refs[ref] + ref_name = self.visit(resolved, ref_name) + self._refs_being_resolved.remove(ref) + return ref_name + + def _generate_constant_rule(self, value): + return self._format_literal(json.dumps(value)) + + def visit(self, schema, name): + schema_type = schema.get('type') + schema_format = schema.get('format') + rule_name = name + '-' if name in RESERVED_NAMES else name or 'root' + + if (ref := schema.get('$ref')) is not None: + return self._add_rule(rule_name, self._resolve_ref(ref)) + + elif 'oneOf' in schema or 'anyOf' in schema: + return self._add_rule(rule_name, self._generate_union_rule(name, schema.get('oneOf') or schema['anyOf'])) + + elif isinstance(schema_type, list): + return self._add_rule(rule_name, self._generate_union_rule(name, [{'type': t} for t in schema_type])) + + elif 'const' in schema: + return self._add_rule(rule_name, self._generate_constant_rule(schema['const'])) + + elif 'enum' in schema: + rule = ' | '.join((self._generate_constant_rule(v) for v in schema['enum'])) + return self._add_rule(rule_name, rule) + + elif schema_type in (None, 'object') and \ + ('properties' in schema or \ + ('additionalProperties' in schema and schema['additionalProperties'] is not True)): + required = set(schema.get('required', [])) + properties = list(schema.get('properties', {}).items()) + return self._add_rule(rule_name, self._build_object_rule(properties, required, name, schema.get('additionalProperties'))) + + elif schema_type in (None, 'object') and 'allOf' in schema: + required = set() + properties = [] + hybrid_name = name + def add_component(comp_schema, is_required): + if (ref := comp_schema.get('$ref')) is not None: + comp_schema = self._refs[ref] + + if 'properties' in comp_schema: + for prop_name, prop_schema in comp_schema['properties'].items(): + properties.append((prop_name, prop_schema)) + if is_required: + required.add(prop_name) + + for t in schema['allOf']: + if 'anyOf' in t: + for tt in t['anyOf']: + add_component(tt, is_required=False) + else: + add_component(t, is_required=True) + + return self._add_rule(rule_name, self._build_object_rule(properties, required, hybrid_name, additional_properties=[])) + + elif schema_type in (None, 'array') and ('items' in schema or 'prefixItems' in schema): + items = schema.get('items') or schema['prefixItems'] + if isinstance(items, list): + return self._add_rule( + rule_name, + '"[" space ' + + ' "," space '.join( + self.visit(item, f'{name}{"-" if name else ""}tuple-{i}') + for i, item in enumerate(items)) + + ' "]" space') + else: + item_rule_name = self.visit(items, f'{name}{"-" if name else ""}item') + min_items = schema.get("minItems", 0) + max_items = schema.get("maxItems") + return self._add_rule(rule_name, '"[" space ' + _build_repetition(item_rule_name, min_items, max_items, separator_rule='"," space') + ' "]" space') + + elif schema_type in (None, 'string') and 'pattern' in schema: + return self._visit_pattern(schema['pattern'], rule_name) + + elif schema_type in (None, 'string') and re.match(r'^uuid[1-5]?$', schema_format or ''): + return self._add_primitive( + 'root' if rule_name == 'root' else schema_format, + PRIMITIVE_RULES['uuid'] + ) + + elif schema_type in (None, 'string') and f'{schema_format}-string' in STRING_FORMAT_RULES: + prim_name = f'{schema_format}-string' + return self._add_rule(rule_name, self._add_primitive(prim_name, STRING_FORMAT_RULES[prim_name])) + + elif schema_type == 'string' and ('minLength' in schema or 'maxLength' in schema): + char_rule = self._add_primitive('char', PRIMITIVE_RULES['char']) + min_len = schema.get('minLength', 0) + max_len = schema.get('maxLength') + + return self._add_rule(rule_name, r'"\"" ' + _build_repetition(char_rule, min_len, max_len) + r' "\"" space') + + elif (schema_type == 'object') or (len(schema) == 0): + return self._add_rule(rule_name, self._add_primitive('object', PRIMITIVE_RULES['object'])) + + else: + assert schema_type in PRIMITIVE_RULES, f'Unrecognized schema: {schema}' + # TODO: support minimum, maximum, exclusiveMinimum, exclusiveMaximum at least for zero + return self._add_primitive('root' if rule_name == 'root' else schema_type, PRIMITIVE_RULES[schema_type]) + + def _add_primitive(self, name: str, rule: BuiltinRule): + n = self._add_rule(name, rule.content) + + for dep in rule.deps: + dep_rule = PRIMITIVE_RULES.get(dep) or STRING_FORMAT_RULES.get(dep) + assert dep_rule, f'Rule {dep} not known' + if dep not in self._rules: + self._add_primitive(dep, dep_rule) + return n + + def _build_object_rule(self, properties: List[Tuple[str, Any]], required: Set[str], name: str, additional_properties: Union[bool, Any]): + prop_order = self._prop_order + # sort by position in prop_order (if specified) then by original order + sorted_props = [kv[0] for _, kv in sorted(enumerate(properties), key=lambda ikv: (prop_order.get(ikv[1][0], len(prop_order)), ikv[0]))] + + prop_kv_rule_names = {} + for prop_name, prop_schema in properties: + prop_rule_name = self.visit(prop_schema, f'{name}{"-" if name else ""}{prop_name}') + prop_kv_rule_names[prop_name] = self._add_rule( + f'{name}{"-" if name else ""}{prop_name}-kv', + 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_primitive('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() diff --git a/examples/regex-to-grammar.py b/examples/regex-to-grammar.py index c98118e9..5cd9210a 100644 --- a/examples/regex-to-grammar.py +++ b/examples/regex-to-grammar.py @@ -8,7 +8,7 @@ print(subprocess.check_output( "python", os.path.join( os.path.dirname(os.path.realpath(__file__)), - "json-schema-to-grammar.py"), + "json_schema_to_grammar.py"), *rest, "-", "--raw-pattern", diff --git a/examples/server/README.md b/examples/server/README.md index a6fc92ea..918ac129 100644 --- a/examples/server/README.md +++ b/examples/server/README.md @@ -11,6 +11,7 @@ Set of LLM REST APIs and a simple web front end to interact with llama.cpp. * Continuous batching * Multimodal (wip) * Monitoring endpoints + * Schema-constrained JSON response format The project is under active development, and we are [looking for feedback and contributors](https://github.com/ggerganov/llama.cpp/issues/4216). @@ -250,6 +251,8 @@ node index.js `grammar`: Set grammar for grammar-based sampling. Default: no grammar + `json_schema`: Set a JSON schema for grammar-based sampling (e.g. `{"items": {"type": "string"}, "minItems": 10, "maxItems": 100}` of a list of strings, or `{}` for any JSON). See [tests](../../tests/test-json-schema-to-grammar.cpp) for supported features. Default: no JSON schema. + `seed`: Set the random number generator (RNG) seed. Default: `-1`, which is a random seed. `ignore_eos`: Ignore end of stream token and continue generating. Default: `false` @@ -365,6 +368,8 @@ Notice that each `probs` is an array of length `n_probs`. See [OpenAI Chat Completions API documentation](https://platform.openai.com/docs/api-reference/chat). While some OpenAI-specific features such as function calling aren't supported, llama.cpp `/completion`-specific features such as `mirostat` are supported. + The `response_format` parameter supports both plain JSON output (e.g. `{"type": "json_object"}`) and schema-constrained JSON (e.g. `{"type": "json_object", "schema": {"type": "string", "minLength": 10, "maxLength": 100}}`), similar to other OpenAI-inspired API providers. + *Examples:* You can use either Python `openai` library with appropriate checkpoints: diff --git a/examples/server/json-schema-to-grammar.mjs.hpp b/examples/server/json-schema-to-grammar.mjs.hpp index ef1d5dcf..da5035bf 100644 --- a/examples/server/json-schema-to-grammar.mjs.hpp +++ b/examples/server/json-schema-to-grammar.mjs.hpp @@ -2,1643 +2,1825 @@ unsigned char json_schema_to_grammar_mjs[] = { 0x2f, 0x2f, 0x20, 0x57, 0x41, 0x52, 0x4e, 0x49, 0x4e, 0x47, 0x3a, 0x20, 0x54, 0x68, 0x69, 0x73, 0x20, 0x66, 0x69, 0x6c, 0x65, 0x20, 0x77, 0x61, 0x73, 0x20, 0x70, 0x6f, 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+unsigned int json_schema_to_grammar_mjs_len = 21866; diff --git a/examples/server/public/json-schema-to-grammar.mjs b/examples/server/public/json-schema-to-grammar.mjs index 17bd60fd..8e0be1b4 100644 --- a/examples/server/public/json-schema-to-grammar.mjs +++ b/examples/server/public/json-schema-to-grammar.mjs @@ -1,33 +1,95 @@ -// WARNING: This file was ported from json-schema-to-grammar.py, please fix bugs / add features there first. +// WARNING: This file was ported from json_schema_to_grammar.py, please fix bugs / add features there first. const SPACE_RULE = '" "?'; +function _buildRepetition(itemRule, minItems, maxItems, opts={}) { + const separatorRule = opts.separatorRule ?? ''; + const itemRuleIsLiteral = opts.itemRuleIsLiteral ?? false + + if (separatorRule === '') { + if (minItems === 0 && maxItems === 1) { + return `${itemRule}?`; + } else if (minItems === 1 && maxItems === undefined) { + return `${itemRule}+`; + } + } + + let result = ''; + if (minItems > 0) { + if (itemRuleIsLiteral && separatorRule === '') { + result = `"${itemRule.slice(1, -1).repeat(minItems)}"`; + } else { + result = Array.from({ length: minItems }, () => itemRule) + .join(separatorRule !== '' ? ` ${separatorRule} ` : ' '); + } + } + + const optRepetitions = (upToN, prefixWithSep=false) => { + const content = separatorRule !== '' && prefixWithSep ? `${separatorRule} ${itemRule}` : itemRule; + if (upToN === 0) { + return ''; + } else if (upToN === 1) { + return `(${content})?`; + } else if (separatorRule !== '' && !prefixWithSep) { + return `(${content} ${optRepetitions(upToN - 1, true)})?`; + } else { + return Array.from({ length: upToN }, () => `(${content}`).join(' ').trim() + Array.from({ length: upToN }, () => ')?').join(''); + } + }; + + if (minItems > 0 && maxItems !== minItems) { + result += ' '; + } + + if (maxItems !== undefined) { + result += optRepetitions(maxItems - minItems, minItems > 0); + } else { + const itemOperator = `(${separatorRule !== '' ? separatorRule + ' ' : ''}${itemRule})`; + + if (minItems === 0 && separatorRule !== '') { + result = `(${itemRule} ${itemOperator}*)?`; + } else { + result += `${itemOperator}*`; + } + } + + return result; +} + +class BuiltinRule { + constructor(content, deps) { + this.content = content; + this.deps = deps || []; + } +} + +const UP_TO_15_DIGITS = _buildRepetition('[0-9]', 0, 15); + const PRIMITIVE_RULES = { - boolean: '("true" | "false") space', - number: '("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space', - integer: '("-"? ([0-9] | [1-9] [0-9]*)) space', - value: 'object | array | string | number | boolean', - object: '"{" space ( string ":" space value ("," space string ":" space value)* )? "}" space', - array: '"[" space ( value ("," space value)* )? "]" space', - uuid: '"\\"" ' + [8, 4, 4, 4, 12].map(n => [...new Array(n)].map(_ => '[0-9a-fA-F]').join('')).join(' "-" ') + ' "\\"" space', - string: ` "\\"" ( - [^"\\\\] | - "\\\\" (["\\\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) - )* "\\"" space`, - null: '"null" space', + boolean : new BuiltinRule('("true" | "false") space', []), + 'decimal-part' : new BuiltinRule('[0-9] ' + UP_TO_15_DIGITS, []), + 'integral-part': new BuiltinRule('[0-9] | [1-9] ' + UP_TO_15_DIGITS, []), + number : new BuiltinRule('("-"? integral-part) ("." decimal-part)? ([eE] [-+]? integral-part)? space', ['integral-part', 'decimal-part']), + integer : new BuiltinRule('("-"? integral-part) space', ['integral-part']), + value : new BuiltinRule('object | array | string | number | boolean | null', ['object', 'array', 'string', 'number', 'boolean', 'null']), + object : new BuiltinRule('"{" space ( string ":" space value ("," space string ":" space value)* )? "}" space', ['string', 'value']), + array : new BuiltinRule('"[" space ( value ("," space value)* )? "]" space', ['value']), + uuid : new BuiltinRule('"\\"" ' + [8, 4, 4, 4, 12].map(n => [...new Array(n)].map(_ => '[0-9a-fA-F]').join('')).join(' "-" ') + ' "\\"" space', []), + char : new BuiltinRule(`[^"\\\\] | "\\\\" (["\\\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])`, []), + string : new BuiltinRule(`"\\"" char* "\\"" space`, ['char']), + null : new BuiltinRule('"null" space', []), }; -const OBJECT_RULE_NAMES = ['object', 'array', 'string', 'number', 'boolean', 'null', 'value']; // TODO: support "uri", "email" string formats -const DATE_RULES = { - '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] )', - '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] )', - 'date-time': 'date "T" time', - 'date-string': '"\\"" date "\\"" space', - 'time-string': '"\\"" time "\\"" space', - 'date-time-string': '"\\"" date-time "\\"" space', -}; +const STRING_FORMAT_RULES = { + 'date' : new BuiltinRule('[0-9] [0-9] [0-9] [0-9] "-" ( "0" [1-9] | "1" [0-2] ) "-" ( \"0\" [1-9] | [1-2] [0-9] | "3" [0-1] )', []), + 'time' : new BuiltinRule('([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] )', []), + 'date-time' : new BuiltinRule('date "T" time', ['date', 'time']), + 'date-string' : new BuiltinRule('"\\"" date "\\"" space', ['date']), + 'time-string' : new BuiltinRule('"\\"" time "\\"" space', ['time']), + 'date-time-string': new BuiltinRule('"\\"" date-time "\\"" space', ['date-time']), +} -const RESERVED_NAMES = {'root': true, ...PRIMITIVE_RULES, ...DATE_RULES}; +const RESERVED_NAMES = {'root': true, ...PRIMITIVE_RULES, ...STRING_FORMAT_RULES}; const INVALID_RULE_CHARS_RE = /[^\dA-Za-z-]+/g; const GRAMMAR_LITERAL_ESCAPE_RE = /[\n\r"]/g; @@ -158,7 +220,7 @@ export class SchemaConverter { rule = '[\\U00000000-\\U0010FFFF]'; } else { // Accept any character... except \n and \r line break chars (\x0A and \xOD) - rule = '[\\U00000000-\\x09\\x0B\\x0C\\x0E-\\U0010FFFF]'; + rule = '[^\\x0A\\x0D]'; } return this._addRule('dot', rule); }; @@ -259,26 +321,19 @@ export class SchemaConverter { let [sub, subIsLiteral] = seq[seq.length - 1]; - if (minTimes === 0 && maxTimes === Infinity) { - seq[seq.length - 1] = [`${sub}*`, false]; - } else if (minTimes === 0 && maxTimes === 1) { - seq[seq.length - 1] = [`${sub}?`, false]; - } else if (minTimes === 1 && maxTimes === Infinity) { - seq[seq.length - 1] = [`${sub}+`, false]; - } else { - if (!subIsLiteral) { - let id = subRuleIds[sub]; - if (id === undefined) { - id = this._addRule(`${name}-${Object.keys(subRuleIds).length + 1}`, sub); - subRuleIds[sub] = id; - } - sub = id; + if (!subIsLiteral) { + let id = subRuleIds[sub]; + if (id === undefined) { + id = this._addRule(`${name}-${Object.keys(subRuleIds).length + 1}`, sub); + subRuleIds[sub] = id; } - - const repeatedSub = Array.from({ length: minTimes }, () => subIsLiteral ? `"${sub.slice(1, -1).repeat(minTimes)}"` : sub); - const optionalSub = maxTimes !== undefined ? Array.from({ length: maxTimes - minTimes }, () => `${sub}?`) : [`${sub}*`]; - seq[seq.length - 1] = [repeatedSub.concat(optionalSub).join(' '), false]; + sub = id; } + + seq[seq.length - 1] = [ + _buildRepetition(subIsLiteral ? `"${sub}"` : sub, minTimes, maxTimes, {itemRuleIsLiteral: subIsLiteral}), + false + ]; } else { let literal = ''; while (i < length) { @@ -394,47 +449,48 @@ export class SchemaConverter { ); } else { const itemRuleName = this.visit(items, `${name ?? ''}${name ? '-' : ''}item`); - const listItemOperator = `( "," space ${itemRuleName} )`; - let successiveItems = ''; - let minItems = schema.minItems || 0; + const minItems = schema.minItems || 0; const maxItems = schema.maxItems; - if (minItems > 0) { - successiveItems = listItemOperator.repeat(minItems - 1); - minItems--; - } - if (maxItems !== undefined && maxItems > minItems) { - successiveItems += `${listItemOperator}?`.repeat(maxItems - minItems - 1); - } else { - successiveItems += `${listItemOperator}*`; - } - const rule = minItems === 0 - ? `"[" space ( ${itemRuleName} ${successiveItems} )? "]" space` - : `"[" space ${itemRuleName} ${successiveItems} "]" space`; - return this._addRule(ruleName, rule); + return this._addRule(ruleName, '"[" space ' + _buildRepetition(itemRuleName, minItems, maxItems, {separatorRule: '"," space'}) + ' "]" space'); } } else if ((schemaType === undefined || schemaType === 'string') && 'pattern' in schema) { return this._visitPattern(schema.pattern, ruleName); } else if ((schemaType === undefined || schemaType === 'string') && /^uuid[1-5]?$/.test(schema.format || '')) { - return this._addRule( - ruleName === 'root' ? 'root' : schemaFormat, - PRIMITIVE_RULES['uuid']) - } else if ((schemaType === undefined || schemaType === 'string') && schema.format in DATE_RULES) { - for (const [t, r] of Object.entries(DATE_RULES)) { - this._addRule(t, r); - } - return schemaFormat + '-string'; + return this._addPrimitive( + ruleName === 'root' ? 'root' : schemaFormat, + PRIMITIVE_RULES['uuid'] + ); + } else if ((schemaType === undefined || schemaType === 'string') && `${schema.format}-string` in STRING_FORMAT_RULES) { + const primName = `${schema.format}-string` + return this._addRule(ruleName, this._addPrimitive(primName, STRING_FORMAT_RULES[primName])); + } else if (schemaType === 'string' && ('minLength' in schema || 'maxLength' in schema)) { + const charRuleName = this._addPrimitive('char', PRIMITIVE_RULES['char']); + const minLen = schema.minLength || 0; + const maxLen = schema.maxLength; + return this._addRule(ruleName, '"\\\"" ' + _buildRepetition(charRuleName, minLen, maxLen) + ' "\\\"" space'); } else if ((schemaType === 'object') || (Object.keys(schema).length === 0)) { - for (const n of OBJECT_RULE_NAMES) { - this._addRule(n, PRIMITIVE_RULES[n]); - } - return this._addRule(ruleName, 'object'); + return this._addRule(ruleName, this._addPrimitive('object', PRIMITIVE_RULES['object'])); } else { if (!(schemaType in PRIMITIVE_RULES)) { throw new Error(`Unrecognized schema: ${JSON.stringify(schema)}`); } // TODO: support minimum, maximum, exclusiveMinimum, exclusiveMaximum at least for zero - return this._addRule(ruleName === 'root' ? 'root' : schemaType, PRIMITIVE_RULES[schemaType]); + return this._addPrimitive(ruleName === 'root' ? 'root' : schemaType, PRIMITIVE_RULES[schemaType]); + } + } + + _addPrimitive(name, rule) { + let n = this._addRule(name, rule.content); + for (const dep of rule.deps) { + const depRule = PRIMITIVE_RULES[dep] || STRING_FORMAT_RULES[dep]; + if (!depRule) { + throw new Error(`Rule ${dep} not known`); + } + if (!(dep in this._rules)) { + this._addPrimitive(dep, depRule); + } } + return n; } _buildObjectRule(properties, required, name, additionalProperties) { @@ -462,7 +518,7 @@ export class SchemaConverter { const valueRule = this.visit(additionalProperties === true ? {} : additionalProperties, `${subName}-value`); propKvRuleNames['*'] = this._addRule( `${subName}-kv`, - `${this._addRule('string', PRIMITIVE_RULES['string'])} ":" space ${valueRule}`); + `${this._addPrimitive('string', PRIMITIVE_RULES['string'])} ":" space ${valueRule}`); optionalProps.push('*'); } diff --git a/examples/server/server.cpp b/examples/server/server.cpp index b08a09a5..634e653a 100644 --- a/examples/server/server.cpp +++ b/examples/server/server.cpp @@ -859,7 +859,7 @@ struct server_context { slot.sparams.min_keep = json_value(data, "min_keep", default_sparams.min_keep); // process "json_schema" and "grammar" - if (data.contains("json_schema") && data.contains("grammar")) { + if (data.contains("json_schema") && !data["json_schema"].is_null() && data.contains("grammar") && !data["grammar"].is_null()) { send_error(task, "Either \"json_schema\" or \"grammar\" can be specified, but not both", ERROR_TYPE_INVALID_REQUEST); return false; } else if (data.contains("json_schema") && !data.contains("grammar")) { diff --git a/examples/ts-type-to-grammar.sh b/examples/ts-type-to-grammar.sh index a7ad0017..9abba2a3 100755 --- a/examples/ts-type-to-grammar.sh +++ b/examples/ts-type-to-grammar.sh @@ -1,7 +1,7 @@ #!/bin/bash # # ./examples/ts-type-to-grammar.sh "{a:string,b:string,c?:string}" -# python examples/json-schema-to-grammar.py https://json.schemastore.org/tsconfig.json +# python examples/json_schema_to_grammar.py https://json.schemastore.org/tsconfig.json # set -euo pipefail @@ -25,4 +25,4 @@ npx ts-json-schema-generator --unstable --no-top-ref --path "$DTS_FILE" --type M # https://github.com/YousefED/typescript-json-schema # npx typescript-json-schema --defaultProps --required "$DTS_FILE" MyType | tee "$SCHEMA_FILE" >&2 -./examples/json-schema-to-grammar.py "$SCHEMA_FILE" +./examples/json_schema_to_grammar.py "$SCHEMA_FILE" diff --git a/grammars/README.md b/grammars/README.md index e1383fa5..c924e8d4 100644 --- a/grammars/README.md +++ b/grammars/README.md @@ -89,3 +89,13 @@ This guide provides a brief overview. Check out the GBNF files in this directory ``` ./main -m --grammar-file grammars/some-grammar.gbnf -p 'Some prompt' ``` + +## Troubleshooting + +Grammars currently have performance gotchas (see https://github.com/ggerganov/llama.cpp/issues/4218). + +### Efficient optional repetitions + +A common pattern is to allow repetitions of a pattern `x` up to N times. + +While semantically correct, the syntax `x? x? x?.... x?` (with N repetitions) will result in extremely slow inference. Instead, you can write `(x (x (x ... (x)?...)?)?)?` (w/ N-deep nesting) diff --git a/tests/test-json-schema-to-grammar.cpp b/tests/test-json-schema-to-grammar.cpp index 4d110cf5..b2ce4d26 100755 --- a/tests/test-json-schema-to-grammar.cpp +++ b/tests/test-json-schema-to-grammar.cpp @@ -104,16 +104,16 @@ static void test_all(const std::string & lang, std::function test-grammar-output.tmp") == 0 ? SUCCESS : FAILURE); + "python ./examples/json_schema_to_grammar.py test-json-schema-input.tmp > test-grammar-output.tmp") == 0 ? SUCCESS : FAILURE); tc.verify(read("test-grammar-output.tmp")); }); } else {