mirror of
https://github.com/yogeshojha/rengine.git
synced 2026-10-21 07:41:28 +02:00
123 lines
3.9 KiB
Python
123 lines
3.9 KiB
Python
from __future__ import annotations
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from datetime import datetime, timedelta
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from sqlalchemy import Text, and_, cast, exists, false, func, not_, or_, select
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from sqlalchemy.dialects.postgresql import JSONB
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from sqlalchemy.dialects.postgresql import array as pg_array
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from shared.definitions.asset_query import FieldType, Op
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from .ast import Compare
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from .values import is_relative, like, moment, scaled_number, split_range
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_ONE_DAY = timedelta(days=1)
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_FLIPPED = {Op.GT: Op.LT, Op.GTE: Op.LTE, Op.LT: Op.GT, Op.LTE: Op.GTE}
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_TRUTHY = {"yes", "true", "1", "any", "present"}
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_FALSY = {"no", "false", "0", "none", "absent"}
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def negate(expr):
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return not_(func.coalesce(expr, false()))
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def threshold(col, op: Op, value):
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if op is Op.GT:
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return col > value
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if op is Op.GTE:
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return col >= value
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if op is Op.LT:
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return col < value
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if op is Op.LTE:
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return col <= value
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if op is Op.NE:
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return or_(col.is_(None), col != value)
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return col == value
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def string_match(col, cmp: Compare):
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if cmp.op is Op.MATCH:
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return or_(*[col.ilike(like(v), escape="\\") for v in cmp.values])
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lowered = [v.lower() for v in cmp.values]
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if cmp.op is Op.EQ:
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return func.lower(col).in_(lowered)
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if cmp.op is Op.NE:
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return or_(col.is_(None), negate(func.lower(col).in_(lowered)))
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matched = or_(*[col.op("~*")(v) for v in cmp.values])
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if cmp.op is Op.RE:
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return matched
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return or_(col.is_(None), negate(matched))
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def number_match(col, cmp: Compare, coerce):
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if cmp.op in (Op.MATCH, Op.EQ, Op.NE):
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branches = []
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for raw in cmp.values:
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bounds = split_range(raw)
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if bounds is None:
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branches.append(col == coerce(raw))
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else:
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branches.append(
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and_(col >= coerce(bounds[0]), col <= coerce(bounds[1]))
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)
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matched = or_(*branches)
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return or_(col.is_(None), negate(matched)) if cmp.op is Op.NE else matched
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return threshold(col, cmp.op, coerce(cmp.values[0]))
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def date_match(col, cmp: Compare, now: datetime, *, future: bool):
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raw = cmp.values[0]
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instant = moment(raw, cmp.start, cmp.end)
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if not is_relative(raw):
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if cmp.op in (Op.MATCH, Op.EQ):
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return and_(col >= instant, col < instant + _ONE_DAY)
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return threshold(col, cmp.op, instant)
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span = now - instant
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boundary = now + span if future else now - span
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if cmp.op in (Op.MATCH, Op.EQ):
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return col <= boundary if future else col >= boundary
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op = cmp.op if future else _FLIPPED.get(cmp.op, cmp.op)
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return threshold(col, op, boundary)
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def json_array_match(col, cmp: Compare):
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if cmp.op is Op.EQ:
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return func.jsonb_exists_any(cast(col, JSONB), pg_array(list(cmp.values)))
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if cmp.op in (Op.RE, Op.NRE):
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element = (
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func.jsonb_array_elements_text(cast(col, JSONB))
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.table_valued("value")
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.alias("element")
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)
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found = exists(
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select(1)
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.select_from(element)
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.where(or_(*[element.c.value.op("~*")(v) for v in cmp.values]))
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)
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return negate(found) if cmp.op is Op.NRE else found
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matched = or_(*[cast(col, Text).ilike(like(v), escape="\\") for v in cmp.values])
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return negate(matched) if cmp.op is Op.NE else matched
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def tri_state(cmp: Compare) -> bool | None:
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if len(cmp.values) != 1:
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return None
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value = cmp.values[0].lower()
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if value in _TRUTHY:
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return True
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return False if value in _FALSY else None
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def int_coerce(cmp: Compare):
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def coerce(raw: str) -> int:
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return int(scaled_number(raw, FieldType.NUMBER, cmp.start, cmp.end))
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return coerce
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def scaled_coerce(cmp: Compare, kind: FieldType):
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def coerce(raw: str) -> float:
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return scaled_number(raw, kind, cmp.start, cmp.end)
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return coerce
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