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Create template filtertransformer BaseTransformer (#287)
* Added BaseTransformer submodule * Created v1.0.0 grammar and a link to v0.10.1 * Tidied older transformer code: - Raise deprecation warning for DjangoTransformer - Removed debug/json transformers - Tweaked basetransformer docstrings * Updated contributing docs * Add no cover to CLI validator method
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| """ This module implements filter transformer classes for different backends. These | ||
| classes typically parse the filter with Lark and produce an appropriate query for the | ||
| given backend. | ||
| """ |
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| import abc | ||
| from lark import Transformer, v_args | ||
| from typing import Dict | ||
| from optimade.server.mappers import BaseResourceMapper | ||
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| __all__ = ("BaseTransformer",) | ||
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| class BaseTransformer(abc.ABC, Transformer): | ||
| """Generic filter transformer that handles various | ||
| parts of the grammar in a backend non-specific way. | ||
| """ | ||
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| # map from standard comparison operators to the backend-specific version | ||
| operator_map: Dict[str, str] = { | ||
| "<": None, | ||
| "<=": None, | ||
| ">": None, | ||
| ">=": None, | ||
| "!=": None, | ||
| "=": None, | ||
| } | ||
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| # map from back-end specific operators to their inverse | ||
| # e.g. {"$lt": "$gt"} for MongoDB. | ||
| reversed_operator_map: Dict[str, str] = {} | ||
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| def __init__(self, mapper: BaseResourceMapper = None): | ||
| """Initialise the transformer object, optionally loading in a | ||
| resource mapper for use when post-processing. | ||
| """ | ||
| self.mapper = mapper | ||
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| def postprocess(self, query): | ||
| """Post-process the query according to the rules defined for | ||
| the backend. | ||
| """ | ||
| return query | ||
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| def transform(self, tree): | ||
| """ Transform the query using the Lark transformer then post-process. """ | ||
| return self.postprocess(super().transform(tree)) | ||
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| def __default__(self, data, children, meta): | ||
| raise NotImplementedError( | ||
| f"Calling __default__, i.e., unknown grammar concept. data: {data}, children: {children}, meta: {meta}" | ||
| ) | ||
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| def filter(self, arg): | ||
| """ filter: expression* """ | ||
| return arg[0] if arg else None | ||
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| @v_args(inline=True) | ||
| def constant(self, value): | ||
| """ constant: string | number """ | ||
| # Note: Return as is. | ||
| return value | ||
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| @v_args(inline=True) | ||
| def value(self, value): | ||
| """ value: string | number | property """ | ||
| # Note: Return as is. | ||
| return value | ||
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| @v_args(inline=True) | ||
| def non_string_value(self, value): | ||
| """ non_string_value: number | property """ | ||
| # Note: Return as is. | ||
| return value | ||
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| @v_args(inline=True) | ||
| def not_implemented_string(self, value): | ||
| """not_implemented_string: value | ||
| Raises: | ||
| NotImplementedError: For further information, see Materials-Consortia/OPTIMADE issue 157: | ||
| https://github.com/Materials-Consortia/OPTIMADE/issues/157 | ||
| """ | ||
| raise NotImplementedError("Comparing strings is not yet implemented.") | ||
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| def property(self, arg): | ||
| """ property: IDENTIFIER ( "." IDENTIFIER )* """ | ||
| return ".".join(arg) | ||
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| @v_args(inline=True) | ||
| def string(self, string): | ||
| """ string: ESCAPED_STRING """ | ||
| return string.strip('"') | ||
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| @v_args(inline=True) | ||
| def signed_int(self, number): | ||
| """ signed_int : SIGNED_INT """ | ||
| return int(number) | ||
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| @v_args(inline=True) | ||
| def number(self, number): | ||
| """ number: SIGNED_INT | SIGNED_FLOAT """ | ||
| if number.type == "SIGNED_INT": | ||
| type_ = int | ||
| elif number.type == "SIGNED_FLOAT": | ||
| type_ = float | ||
| return type_(number) | ||
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| @v_args(inline=True) | ||
| def comparison(self, value): | ||
| """ comparison: constant_first_comparison | property_first_comparison """ | ||
| # Note: Return as is. | ||
| return value | ||
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| @abc.abstractmethod | ||
| def value_list(self, arg): | ||
| """ value_list: [ OPERATOR ] value ( "," [ OPERATOR ] value )* """ | ||
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| @abc.abstractmethod | ||
| def value_zip(self, arg): | ||
| """ value_zip: [ OPERATOR ] value ":" [ OPERATOR ] value (":" [ OPERATOR ] value)* """ | ||
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| @abc.abstractmethod | ||
| def value_zip_list(self, arg): | ||
| """ value_zip_list: value_zip ( "," value_zip )* """ | ||
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| @abc.abstractmethod | ||
| def expression(self, arg): | ||
| """ expression: expression_clause ( OR expression_clause ) """ | ||
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| @abc.abstractmethod | ||
| def expression_clause(self, arg): | ||
| """ expression_clause: expression_phrase ( AND expression_phrase )* """ | ||
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| @abc.abstractmethod | ||
| def expression_phrase(self, arg): | ||
| """ expression_phrase: [ NOT ] ( comparison | "(" expression ")" ) """ | ||
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| @abc.abstractmethod | ||
| def property_first_comparison(self, arg): | ||
| """property_first_comparison: property ( value_op_rhs | known_op_rhs | fuzzy_string_op_rhs | set_op_rhs | | ||
| set_zip_op_rhs | length_op_rhs ) | ||
| """ | ||
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| @abc.abstractmethod | ||
| def constant_first_comparison(self, arg): | ||
| """ constant_first_comparison: constant OPERATOR ( non_string_value | not_implemented_string ) """ | ||
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| @v_args(inline=True) | ||
| @abc.abstractmethod | ||
| def value_op_rhs(self, operator, value): | ||
| """ value_op_rhs: OPERATOR value """ | ||
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| @abc.abstractmethod | ||
| def known_op_rhs(self, arg): | ||
| """ known_op_rhs: IS ( KNOWN | UNKNOWN ) """ | ||
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| @abc.abstractmethod | ||
| def fuzzy_string_op_rhs(self, arg): | ||
| """ fuzzy_string_op_rhs: CONTAINS value | STARTS [ WITH ] value | ENDS [ WITH ] value """ | ||
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| @abc.abstractmethod | ||
| def set_op_rhs(self, arg): | ||
| """ set_op_rhs: HAS ( [ OPERATOR ] value | ALL value_list | ANY value_list | ONLY value_list ) """ | ||
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| @abc.abstractmethod | ||
| def length_op_rhs(self, arg): | ||
| """ length_op_rhs: LENGTH [ OPERATOR ] value """ | ||
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| @abc.abstractmethod | ||
| def set_zip_op_rhs(self, arg): | ||
| """set_zip_op_rhs: property_zip_addon HAS ( value_zip | ONLY value_zip_list | ALL value_zip_list | | ||
| ANY value_zip_list ) | ||
| """ | ||
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| @abc.abstractmethod | ||
| def property_zip_addon(self, arg): | ||
| """ property_zip_addon: ":" property (":" property)* """ |
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