64 lines
2 KiB
Python
64 lines
2 KiB
Python
from sqlglot import exp
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from sqlglot.dialects.dialect import (
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Dialect,
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arrow_json_extract_scalar_sql,
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arrow_json_extract_sql,
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no_ilike_sql,
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no_tablesample_sql,
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no_trycast_sql,
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rename_func,
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)
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from sqlglot.generator import Generator
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from sqlglot.parser import Parser
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from sqlglot.tokens import Tokenizer, TokenType
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class SQLite(Dialect):
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class Tokenizer(Tokenizer):
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IDENTIFIERS = ['"', ("[", "]"), "`"]
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HEX_STRINGS = [("x'", "'"), ("X'", "'"), ("0x", ""), ("0X", "")]
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KEYWORDS = {
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**Tokenizer.KEYWORDS,
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"AUTOINCREMENT": TokenType.AUTO_INCREMENT,
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}
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class Parser(Parser):
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FUNCTIONS = {
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**Parser.FUNCTIONS,
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"EDITDIST3": exp.Levenshtein.from_arg_list,
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}
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class Generator(Generator):
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TYPE_MAPPING = {
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**Generator.TYPE_MAPPING,
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exp.DataType.Type.BOOLEAN: "INTEGER",
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exp.DataType.Type.TINYINT: "INTEGER",
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exp.DataType.Type.SMALLINT: "INTEGER",
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exp.DataType.Type.INT: "INTEGER",
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exp.DataType.Type.BIGINT: "INTEGER",
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exp.DataType.Type.FLOAT: "REAL",
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exp.DataType.Type.DOUBLE: "REAL",
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exp.DataType.Type.DECIMAL: "REAL",
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exp.DataType.Type.CHAR: "TEXT",
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exp.DataType.Type.NCHAR: "TEXT",
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exp.DataType.Type.VARCHAR: "TEXT",
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exp.DataType.Type.NVARCHAR: "TEXT",
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exp.DataType.Type.BINARY: "BLOB",
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}
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TOKEN_MAPPING = {
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TokenType.AUTO_INCREMENT: "AUTOINCREMENT",
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}
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TRANSFORMS = {
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**Generator.TRANSFORMS,
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exp.ILike: no_ilike_sql,
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exp.JSONExtract: arrow_json_extract_sql,
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exp.JSONExtractScalar: arrow_json_extract_scalar_sql,
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exp.JSONBExtract: arrow_json_extract_sql,
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exp.JSONBExtractScalar: arrow_json_extract_scalar_sql,
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exp.Levenshtein: rename_func("EDITDIST3"),
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exp.TableSample: no_tablesample_sql,
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exp.TryCast: no_trycast_sql,
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}
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