mirror of
https://github.com/vllm-project/vllm.git
synced 2025-10-20 23:03:52 +08:00
229 lines
7.2 KiB
Python
229 lines
7.2 KiB
Python
import re
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def has_xgrammar_unsupported_json_features(schema: dict) -> bool:
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"""Check if JSON schema contains features unsupported by xgrammar."""
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def check_object(obj: dict) -> bool:
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if not isinstance(obj, dict):
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return False
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# Check for pattern restrictions
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if "pattern" in obj:
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return True
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# Check for numeric ranges
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if obj.get("type") in ("integer", "number") and any(
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key in obj for key in [
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"minimum", "maximum", "exclusiveMinimum",
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"exclusiveMaximum", "multipleOf"
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]):
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return True
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# Recursively check all nested objects and arrays
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for value in obj.values():
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if isinstance(value, dict):
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if check_object(value):
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return True
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elif isinstance(value, list):
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for item in value:
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if isinstance(item, dict) and check_object(item):
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return True
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return False
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return check_object(schema)
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def has_lmf_unsupported_json_features(schema: dict) -> bool:
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"""
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Check if JSON schema contains features unsupported
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by lm_format_enforcer.
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Known issues:
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- Regex patterns:
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"grade": {
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"type": "string",
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"pattern": "^[A-D]$" # Regex pattern
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},
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"""
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def check_object(obj: dict) -> bool:
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if not isinstance(obj, dict):
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return False
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# Check for pattern restrictions
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if "pattern" in obj:
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return True
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# Recursively check all nested objects and arrays
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for value in obj.values():
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if isinstance(value, dict):
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if check_object(value):
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return True
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elif isinstance(value, list):
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for item in value:
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if isinstance(item, dict) and check_object(item):
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return True
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return False
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return check_object(schema)
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def grammar_is_likely_lark(grammar_str: str) -> bool:
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"""
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Check if grammar appears to use Lark syntax.
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Args:
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grammar_str: Input grammar string
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Returns:
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bool: True if grammar appears to be in Lark format, False otherwise
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Examples:
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>>> grammar_is_likely_lark("rule: 'abc'")
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True
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>>> grammar_is_likely_lark("rule ::= 'abc'")
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False
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"""
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if not grammar_str or not isinstance(grammar_str, str):
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return False
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for line in grammar_str.split('\n'):
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# Remove both comment styles
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line = re.sub(r'(#|//).*$', '', line).strip()
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if not line:
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continue
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# Look for GBNF rule definition
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if '::=' in line:
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return False
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return True
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def convert_lark_to_gbnf(grammar_str: str) -> str:
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"""
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Convert a Lark grammar string to GBNF format.
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GBNF reference:
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https://github.com/ggerganov/llama.cpp/blob/master/grammars/README.md
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Lark grammar reference:
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https://lark-parser.readthedocs.io/en/latest/grammar.html
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Args:
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grammar_str: Input grammar in Lark format
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Returns:
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str: Converted grammar in GBNF format
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Examples:
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>>> print(convert_lark_to_gbnf("rule: 'hello'"))
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root ::= rule
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rule ::= "hello"
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"""
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if not isinstance(grammar_str, str):
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raise ValueError(f"Grammar must be a string, got {type(grammar_str)}")
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if not grammar_str.strip():
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raise ValueError("Grammar string cannot be empty")
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defined_rules = set()
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referenced_rules = set()
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output_lines = []
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def clean_line(line: str) -> str:
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"""Remove comments and whitespace from line."""
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return re.sub(r'(#|//).*$', '', line).strip()
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def check_quotes(text: str, rule_name: str, line_num: int) -> None:
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"""Validate quote matching in text."""
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if text.count("'") % 2 != 0 or text.count('"') % 2 != 0:
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raise ValueError(
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f"Mismatched quotes in {rule_name} on line {line_num}")
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def extract_references(text: str) -> set:
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"""Extract rule references from text."""
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# Remove quoted strings and special characters
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text = re.sub(r'"[^"]*"', '', text)
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text = re.sub(r'[+*?()|\[\]{}]', ' ', text)
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return set(re.findall(r'\b[a-zA-Z_][a-zA-Z0-9_]*\b', text))
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# First pass: Find root rule and validate rule definitions
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lines = [clean_line(line) for line in grammar_str.split('\n')]
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first_rule = None
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for line_num, line in enumerate(lines, 1):
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if not line or line.startswith('|'):
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continue
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if ':' in line:
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try:
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name = line.split(':', 1)[0].strip().strip('?')
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defined_rules.add(name)
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if first_rule is None:
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first_rule = name
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if name == 'start':
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first_rule = 'start'
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except IndexError as e:
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raise ValueError(f"Invalid rule format on line {line_num}. "
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"Expected 'rule_name: definition'") from e
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if not defined_rules:
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raise ValueError("No valid rules found in grammar")
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# Add root rule
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output_lines.append(f"root ::= {first_rule}")
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# Second pass: Process rule definitions and alternatives
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current_rule = None
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current_definition = []
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for line_num, line in enumerate(lines, 1):
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if not line:
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continue
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try:
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if ':' in line and not line.startswith('|'):
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# Save previous rule if exists
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if current_rule:
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output_lines.append(
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f"{current_rule} ::= {' | '.join(current_definition)}")
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# Process new rule
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name, definition = line.split(':', 1)
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current_rule = name.strip().strip('?')
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check_quotes(definition, f"rule '{current_rule}'", line_num)
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definition = re.sub(r"'([^']*)'", r'"\1"', definition)
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referenced_rules.update(extract_references(definition))
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current_definition = [definition.strip()]
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elif line.startswith('|'):
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if not current_rule:
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raise ValueError(f"Alternative '|' on line {line_num} "
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"without a preceding rule definition")
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alt_def = line[1:].strip()
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check_quotes(alt_def, f"alternative for rule '{current_rule}'",
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line_num)
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alt_def = re.sub(r"'([^']*)'", r'"\1"', alt_def)
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referenced_rules.update(extract_references(alt_def))
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current_definition.append(alt_def)
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except ValueError as e:
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raise ValueError(f"Error on line {line_num}: {str(e)}") from e
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# Add final rule if exists
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if current_rule:
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output_lines.append(
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f"{current_rule} ::= {' | '.join(current_definition)}")
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# Validate all rules are defined
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undefined_rules = referenced_rules - defined_rules - {'root'}
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if undefined_rules:
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raise ValueError("Referenced rules are not defined: "
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f"{', '.join(sorted(undefined_rules))}")
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return '\n'.join(output_lines)
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