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from sqlglot import exp
from sqlglot.dialects.dialect import Dialect, rename_func
from sqlglot.expressions import DataType
from sqlglot.generator import Generator
from sqlglot.helper import list_get
from sqlglot.parser import Parser
from sqlglot.time import format_time
from sqlglot.tokens import Tokenizer, TokenType
FULL_FORMAT_TIME_MAPPING = {"weekday": "%A", "dw": "%A", "w": "%A", "month": "%B", "mm": "%B", "m": "%B"}
DATE_DELTA_INTERVAL = {
"year": "year",
"yyyy": "year",
"yy": "year",
"quarter": "quarter",
"qq": "quarter",
"q": "quarter",
"month": "month",
"mm": "month",
"m": "month",
"week": "week",
"ww": "week",
"wk": "week",
"day": "day",
"dd": "day",
"d": "day",
}
def tsql_format_time_lambda(exp_class, full_format_mapping=None, default=None):
def _format_time(args):
return exp_class(
this=list_get(args, 1),
format=exp.Literal.string(
format_time(
list_get(args, 0).name or (TSQL.time_format if default is True else default),
{**TSQL.time_mapping, **FULL_FORMAT_TIME_MAPPING} if full_format_mapping else TSQL.time_mapping,
)
),
)
return _format_time
def parse_date_delta(exp_class):
def inner_func(args):
unit = DATE_DELTA_INTERVAL.get(list_get(args, 0).name.lower(), "day")
return exp_class(this=list_get(args, 2), expression=list_get(args, 1), unit=unit)
return inner_func
def generate_date_delta(self, e):
func = "DATEADD" if isinstance(e, exp.DateAdd) else "DATEDIFF"
return f"{func}({self.format_args(e.text('unit'), e.expression, e.this)})"
class TSQL(Dialect):
null_ordering = "nulls_are_small"
time_format = "'yyyy-mm-dd hh:mm:ss'"
time_mapping = {
"yyyy": "%Y",
"yy": "%y",
"year": "%Y",
"qq": "%q",
"q": "%q",
"quarter": "%q",
"dayofyear": "%j",
"day": "%d",
"dy": "%d",
"y": "%Y",
"week": "%W",
"ww": "%W",
"wk": "%W",
"hour": "%h",
"hh": "%I",
"minute": "%M",
"mi": "%M",
"n": "%M",
"second": "%S",
"ss": "%S",
"s": "%-S",
"millisecond": "%f",
"ms": "%f",
"weekday": "%W",
"dw": "%W",
"month": "%m",
"mm": "%M",
"m": "%-M",
"Y": "%Y",
"YYYY": "%Y",
"YY": "%y",
"MMMM": "%B",
"MMM": "%b",
"MM": "%m",
"M": "%-m",
"dd": "%d",
"d": "%-d",
"HH": "%H",
"H": "%-H",
"h": "%-I",
"S": "%f",
}
convert_format_mapping = {
"0": "%b %d %Y %-I:%M%p",
"1": "%m/%d/%y",
"2": "%y.%m.%d",
"3": "%d/%m/%y",
"4": "%d.%m.%y",
"5": "%d-%m-%y",
"6": "%d %b %y",
"7": "%b %d, %y",
"8": "%H:%M:%S",
"9": "%b %d %Y %-I:%M:%S:%f%p",
"10": "mm-dd-yy",
"11": "yy/mm/dd",
"12": "yymmdd",
"13": "%d %b %Y %H:%M:ss:%f",
"14": "%H:%M:%S:%f",
"20": "%Y-%m-%d %H:%M:%S",
"21": "%Y-%m-%d %H:%M:%S.%f",
"22": "%m/%d/%y %-I:%M:%S %p",
"23": "%Y-%m-%d",
"24": "%H:%M:%S",
"25": "%Y-%m-%d %H:%M:%S.%f",
"100": "%b %d %Y %-I:%M%p",
"101": "%m/%d/%Y",
"102": "%Y.%m.%d",
"103": "%d/%m/%Y",
"104": "%d.%m.%Y",
"105": "%d-%m-%Y",
"106": "%d %b %Y",
"107": "%b %d, %Y",
"108": "%H:%M:%S",
"109": "%b %d %Y %-I:%M:%S:%f%p",
"110": "%m-%d-%Y",
"111": "%Y/%m/%d",
"112": "%Y%m%d",
"113": "%d %b %Y %H:%M:%S:%f",
"114": "%H:%M:%S:%f",
"120": "%Y-%m-%d %H:%M:%S",
"121": "%Y-%m-%d %H:%M:%S.%f",
}
class Tokenizer(Tokenizer):
IDENTIFIERS = ['"', ("[", "]")]
KEYWORDS = {
**Tokenizer.KEYWORDS,
"BIT": TokenType.BOOLEAN,
"REAL": TokenType.FLOAT,
"NTEXT": TokenType.TEXT,
"SMALLDATETIME": TokenType.DATETIME,
"DATETIME2": TokenType.DATETIME,
"DATETIMEOFFSET": TokenType.TIMESTAMPTZ,
"TIME": TokenType.TIMESTAMP,
"VARBINARY": TokenType.BINARY,
"IMAGE": TokenType.IMAGE,
"MONEY": TokenType.MONEY,
"SMALLMONEY": TokenType.SMALLMONEY,
"ROWVERSION": TokenType.ROWVERSION,
"UNIQUEIDENTIFIER": TokenType.UNIQUEIDENTIFIER,
"XML": TokenType.XML,
"SQL_VARIANT": TokenType.VARIANT,
"NVARCHAR(MAX)": TokenType.TEXT,
"VARCHAR(MAX)": TokenType.TEXT,
}
class Parser(Parser):
FUNCTIONS = {
**Parser.FUNCTIONS,
"CHARINDEX": exp.StrPosition.from_arg_list,
"ISNULL": exp.Coalesce.from_arg_list,
"DATEADD": parse_date_delta(exp.DateAdd),
"DATEDIFF": parse_date_delta(exp.DateDiff),
"DATENAME": tsql_format_time_lambda(exp.TimeToStr, full_format_mapping=True),
"DATEPART": tsql_format_time_lambda(exp.TimeToStr),
"GETDATE": exp.CurrentDate.from_arg_list,
"IIF": exp.If.from_arg_list,
"LEN": exp.Length.from_arg_list,
"REPLICATE": exp.Repeat.from_arg_list,
"JSON_VALUE": exp.JSONExtractScalar.from_arg_list,
}
VAR_LENGTH_DATATYPES = {
DataType.Type.NVARCHAR,
DataType.Type.VARCHAR,
DataType.Type.CHAR,
DataType.Type.NCHAR,
}
def _parse_convert(self, strict):
to = self._parse_types()
self._match(TokenType.COMMA)
this = self._parse_field()
# Retrieve length of datatype and override to default if not specified
if list_get(to.expressions, 0) is None and to.this in self.VAR_LENGTH_DATATYPES:
to = exp.DataType.build(to.this, expressions=[exp.Literal.number(30)], nested=False)
# Check whether a conversion with format is applicable
if self._match(TokenType.COMMA):
format_val = self._parse_number().name
if format_val not in TSQL.convert_format_mapping:
raise ValueError(f"CONVERT function at T-SQL does not support format style {format_val}")
format_norm = exp.Literal.string(TSQL.convert_format_mapping[format_val])
# Check whether the convert entails a string to date format
if to.this == DataType.Type.DATE:
return self.expression(exp.StrToDate, this=this, format=format_norm)
# Check whether the convert entails a string to datetime format
elif to.this == DataType.Type.DATETIME:
return self.expression(exp.StrToTime, this=this, format=format_norm)
# Check whether the convert entails a date to string format
elif to.this in self.VAR_LENGTH_DATATYPES:
return self.expression(
exp.Cast if strict else exp.TryCast,
to=to,
this=self.expression(exp.TimeToStr, this=this, format=format_norm),
)
elif to.this == DataType.Type.TEXT:
return self.expression(exp.TimeToStr, this=this, format=format_norm)
# Entails a simple cast without any format requirement
return self.expression(exp.Cast if strict else exp.TryCast, this=this, to=to)
class Generator(Generator):
TYPE_MAPPING = {
**Generator.TYPE_MAPPING,
exp.DataType.Type.BOOLEAN: "BIT",
exp.DataType.Type.INT: "INTEGER",
exp.DataType.Type.DECIMAL: "NUMERIC",
exp.DataType.Type.DATETIME: "DATETIME2",
exp.DataType.Type.VARIANT: "SQL_VARIANT",
}
TRANSFORMS = {
**Generator.TRANSFORMS,
exp.DateAdd: lambda self, e: generate_date_delta(self, e),
exp.DateDiff: lambda self, e: generate_date_delta(self, e),
exp.CurrentDate: rename_func("GETDATE"),
exp.If: rename_func("IIF"),
}
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