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from __future__ import annotations
from sqlglot import exp, generator, parser, tokens
from sqlglot.dialects.dialect import (
Dialect,
arrow_json_extract_scalar_sql,
arrow_json_extract_sql,
no_ilike_sql,
no_tablesample_sql,
no_trycast_sql,
rename_func,
)
from sqlglot.tokens import TokenType
def _fetch_sql(self, expression):
return self.limit_sql(exp.Limit(expression=expression.args.get("count")))
# https://www.sqlite.org/lang_aggfunc.html#group_concat
def _group_concat_sql(self, expression):
this = expression.this
distinct = expression.find(exp.Distinct)
if distinct:
this = distinct.expressions[0]
distinct = "DISTINCT "
if isinstance(expression.this, exp.Order):
self.unsupported("SQLite GROUP_CONCAT doesn't support ORDER BY.")
if expression.this.this and not distinct:
this = expression.this.this
separator = expression.args.get("separator")
return f"GROUP_CONCAT({distinct or ''}{self.format_args(this, separator)})"
def _date_add_sql(self, expression):
modifier = expression.expression
modifier = expression.name if modifier.is_string else self.sql(modifier)
unit = expression.args.get("unit")
modifier = f"'{modifier} {unit.name}'" if unit else f"'{modifier}'"
return f"{self.normalize_func('DATE')}({self.format_args(expression.this, modifier)})"
class SQLite(Dialect):
class Tokenizer(tokens.Tokenizer):
IDENTIFIERS = ['"', ("[", "]"), "`"]
HEX_STRINGS = [("x'", "'"), ("X'", "'"), ("0x", ""), ("0X", "")]
KEYWORDS = {
**tokens.Tokenizer.KEYWORDS,
"AUTOINCREMENT": TokenType.AUTO_INCREMENT,
}
class Parser(parser.Parser):
FUNCTIONS = {
**parser.Parser.FUNCTIONS, # type: ignore
"EDITDIST3": exp.Levenshtein.from_arg_list,
}
class Generator(generator.Generator):
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING, # type: ignore
exp.DataType.Type.BOOLEAN: "INTEGER",
exp.DataType.Type.TINYINT: "INTEGER",
exp.DataType.Type.SMALLINT: "INTEGER",
exp.DataType.Type.INT: "INTEGER",
exp.DataType.Type.BIGINT: "INTEGER",
exp.DataType.Type.FLOAT: "REAL",
exp.DataType.Type.DOUBLE: "REAL",
exp.DataType.Type.DECIMAL: "REAL",
exp.DataType.Type.CHAR: "TEXT",
exp.DataType.Type.NCHAR: "TEXT",
exp.DataType.Type.VARCHAR: "TEXT",
exp.DataType.Type.NVARCHAR: "TEXT",
exp.DataType.Type.BINARY: "BLOB",
exp.DataType.Type.VARBINARY: "BLOB",
}
TOKEN_MAPPING = {
TokenType.AUTO_INCREMENT: "AUTOINCREMENT",
}
TRANSFORMS = {
**generator.Generator.TRANSFORMS, # type: ignore
exp.DateAdd: _date_add_sql,
exp.ILike: no_ilike_sql,
exp.JSONExtract: arrow_json_extract_sql,
exp.JSONExtractScalar: arrow_json_extract_scalar_sql,
exp.JSONBExtract: arrow_json_extract_sql,
exp.JSONBExtractScalar: arrow_json_extract_scalar_sql,
exp.Levenshtein: rename_func("EDITDIST3"),
exp.TableSample: no_tablesample_sql,
exp.DateStrToDate: lambda self, e: self.sql(e, "this"),
exp.TimeStrToTime: lambda self, e: self.sql(e, "this"),
exp.TryCast: no_trycast_sql,
exp.GroupConcat: _group_concat_sql,
exp.Fetch: _fetch_sql,
}
def transaction_sql(self, expression):
this = expression.this
this = f" {this}" if this else ""
return f"BEGIN{this} TRANSACTION"
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