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parser.py — langchain Source File

Architecture documentation for parser.py, a python file in the langchain codebase. 8 imports, 0 dependents.

File python AgentOrchestration ClassicChains 8 imports 3 functions 3 classes

Entity Profile

Dependency Diagram

graph LR
  1ae7993b_d5cf_8ebd_a7db_4833692784eb["parser.py"]
  c0b5feef_1759_3f2b_62d3_f376e06b863f["datetime"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> c0b5feef_1759_3f2b_62d3_f376e06b863f
  f3365e3c_fb7a_bb9a_bc79_059b06cb7024["warnings"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> f3365e3c_fb7a_bb9a_bc79_059b06cb7024
  2bf6d401_816d_d011_3b05_a6114f55ff58["collections.abc"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> 2bf6d401_816d_d011_3b05_a6114f55ff58
  feec1ec4_6917_867b_d228_b134d0ff8099["typing"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> feec1ec4_6917_867b_d228_b134d0ff8099
  bd035cf2_5933_bc0f_65e9_0dfe57627ca3["langchain_core.utils"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> bd035cf2_5933_bc0f_65e9_0dfe57627ca3
  f85fae70_1011_eaec_151c_4083140ae9e5["typing_extensions"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> f85fae70_1011_eaec_151c_4083140ae9e5
  5619f221_a580_f72e_3e32_071432cc276c["lark"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> 5619f221_a580_f72e_3e32_071432cc276c
  c39a1380_2ee7_581e_4839_31617170612b["langchain_core.structured_query"]
  1ae7993b_d5cf_8ebd_a7db_4833692784eb --> c39a1380_2ee7_581e_4839_31617170612b
  style 1ae7993b_d5cf_8ebd_a7db_4833692784eb fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

import datetime
import warnings
from collections.abc import Sequence
from typing import Any, Literal

from langchain_core.utils import check_package_version
from typing_extensions import TypedDict

try:
    check_package_version("lark", gte_version="1.1.5")
    from lark import Lark, Transformer, v_args

    _HAS_LARK = True
except ImportError:

    def v_args(*_: Any, **__: Any) -> Any:  # type: ignore[misc]
        """Dummy decorator for when lark is not installed."""
        return lambda _: None

    Transformer = object  # type: ignore[assignment,misc]
    Lark = object  # type: ignore[assignment,misc]
    _HAS_LARK = False

from langchain_core.structured_query import (
    Comparator,
    Comparison,
    FilterDirective,
    Operation,
    Operator,
)

GRAMMAR = r"""
    ?program: func_call
    ?expr: func_call
        | value

    func_call: CNAME "(" [args] ")"

    ?value: SIGNED_INT -> int
        | SIGNED_FLOAT -> float
        | DATE -> date
        | DATETIME -> datetime
        | list
        | string
        | ("false" | "False" | "FALSE") -> false
        | ("true" | "True" | "TRUE") -> true

    args: expr ("," expr)*
    DATE.2: /["']?(\d{4}-[01]\d-[0-3]\d)["']?/
    DATETIME.2: /["']?\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d[Zz]?["']?/
    string: /'[^']*'/ | ESCAPED_STRING
    list: "[" [args] "]"

    %import common.CNAME
    %import common.ESCAPED_STRING
    %import common.SIGNED_FLOAT
    %import common.SIGNED_INT
    %import common.WS
    %ignore WS
"""
// ... (221 more lines)

Domain

Subdomains

Functions

Classes

Dependencies

  • collections.abc
  • datetime
  • langchain_core.structured_query
  • langchain_core.utils
  • lark
  • typing
  • typing_extensions
  • warnings

Source

Frequently Asked Questions

What does parser.py do?
parser.py is a source file in the langchain codebase, written in python. It belongs to the AgentOrchestration domain, ClassicChains subdomain.
What functions are defined in parser.py?
parser.py defines 3 function(s): check_package_version, get_parser, v_args.
What does parser.py depend on?
parser.py imports 8 module(s): collections.abc, datetime, langchain_core.structured_query, langchain_core.utils, lark, typing, typing_extensions, warnings.
Where is parser.py in the architecture?
parser.py is located at libs/langchain/langchain_classic/chains/query_constructor/parser.py (domain: AgentOrchestration, subdomain: ClassicChains, directory: libs/langchain/langchain_classic/chains/query_constructor).

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