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| 1 | +// |
| 2 | +// ColumnTypeClassifier.swift |
| 3 | +// TablePro |
| 4 | +// |
| 5 | +// Maps raw database type strings to semantic ColumnType values. |
| 6 | +// Handles type wrappers (Nullable, LowCardinality), parameterized types, |
| 7 | +// and database-specific conventions across all supported databases. |
| 8 | +// |
| 9 | + |
| 10 | +import Foundation |
| 11 | + |
| 12 | +struct ColumnTypeClassifier { |
| 13 | + |
| 14 | + func classify(rawTypeName: String) -> ColumnType { |
| 15 | + let stripped = stripWrappers(rawTypeName) |
| 16 | + let (base, params) = extractBaseAndParams(stripped) |
| 17 | + let upper = base.uppercased() |
| 18 | + |
| 19 | + // MySQL convention: TINYINT(1) means boolean |
| 20 | + if upper == "TINYINT", params == "1" { |
| 21 | + return .boolean(rawType: rawTypeName) |
| 22 | + } |
| 23 | + |
| 24 | + if let factory = Self.typeLookup[upper] { |
| 25 | + return factory(rawTypeName) |
| 26 | + } |
| 27 | + |
| 28 | + return classifyByPattern(upper: upper, rawTypeName: rawTypeName) |
| 29 | + } |
| 30 | + |
| 31 | + // MARK: - Wrapper Stripping |
| 32 | + |
| 33 | + private func stripWrappers(_ value: String) -> String { |
| 34 | + for prefix in ["Nullable(", "LowCardinality("] { |
| 35 | + if value.hasPrefix(prefix), value.hasSuffix(")") { |
| 36 | + let startIndex = value.index(value.startIndex, offsetBy: prefix.count) |
| 37 | + let endIndex = value.index(before: value.endIndex) |
| 38 | + let inner = String(value[startIndex..<endIndex]) |
| 39 | + return stripWrappers(inner) |
| 40 | + } |
| 41 | + } |
| 42 | + return value |
| 43 | + } |
| 44 | + |
| 45 | + // MARK: - Base / Params Extraction |
| 46 | + |
| 47 | + private func extractBaseAndParams(_ value: String) -> (base: String, params: String?) { |
| 48 | + guard let parenIndex = value.firstIndex(of: "(") else { |
| 49 | + return (value, nil) |
| 50 | + } |
| 51 | + let base = String(value[value.startIndex..<parenIndex]) |
| 52 | + guard let lastParen = value.lastIndex(of: ")") else { |
| 53 | + return (value, nil) |
| 54 | + } |
| 55 | + let paramsStart = value.index(after: parenIndex) |
| 56 | + let params = String(value[paramsStart..<lastParen]).trimmingCharacters(in: .whitespaces) |
| 57 | + return (base, params) |
| 58 | + } |
| 59 | + |
| 60 | + // MARK: - Pattern Fallback |
| 61 | + |
| 62 | + private func classifyByPattern(upper: String, rawTypeName: String) -> ColumnType { |
| 63 | + if upper.contains("BOOL") { |
| 64 | + return .boolean(rawType: rawTypeName) |
| 65 | + } |
| 66 | + if upper.hasSuffix("SERIAL") { |
| 67 | + return .integer(rawType: rawTypeName) |
| 68 | + } |
| 69 | + if upper.hasSuffix("INT") { |
| 70 | + return .integer(rawType: rawTypeName) |
| 71 | + } |
| 72 | + if upper.hasPrefix("TIMESTAMP") { |
| 73 | + return .timestamp(rawType: rawTypeName) |
| 74 | + } |
| 75 | + if upper.hasSuffix("TEXT") || upper.hasSuffix("CHAR") { |
| 76 | + return .text(rawType: rawTypeName) |
| 77 | + } |
| 78 | + if upper.contains("BLOB") { |
| 79 | + return .blob(rawType: rawTypeName) |
| 80 | + } |
| 81 | + if upper.hasPrefix("ENUM") { |
| 82 | + return .enumType(rawType: rawTypeName, values: nil) |
| 83 | + } |
| 84 | + if upper.hasPrefix("SET(") { |
| 85 | + return .set(rawType: rawTypeName, values: nil) |
| 86 | + } |
| 87 | + return .text(rawType: rawTypeName) |
| 88 | + } |
| 89 | + |
| 90 | + // MARK: - Type Lookup Table |
| 91 | + |
| 92 | + // swiftlint:disable:next function_body_length |
| 93 | + private static let typeLookup: [String: (String) -> ColumnType] = { |
| 94 | + var map: [String: (String) -> ColumnType] = [:] |
| 95 | + |
| 96 | + // Boolean |
| 97 | + for key in ["BOOL", "BOOLEAN", "BIT"] { |
| 98 | + map[key] = { .boolean(rawType: $0) } |
| 99 | + } |
| 100 | + |
| 101 | + // Integer |
| 102 | + for key in [ |
| 103 | + "INT", "INTEGER", "BIGINT", "SMALLINT", "TINYINT", "MEDIUMINT", |
| 104 | + "SERIAL", "BIGSERIAL", "SMALLSERIAL", |
| 105 | + "INT2", "INT4", |
| 106 | + "INT8", "INT16", "INT32", "INT64", "INT128", "INT256", |
| 107 | + "UINT8", "UINT16", "UINT32", "UINT64", "UINT128", "UINT256", |
| 108 | + "UTINYINT", "USMALLINT", "UINTEGER", "UBIGINT", "HUGEINT", "UHUGEINT" |
| 109 | + ] { |
| 110 | + map[key] = { .integer(rawType: $0) } |
| 111 | + } |
| 112 | + |
| 113 | + // Decimal |
| 114 | + for key in [ |
| 115 | + "FLOAT", "DOUBLE", "DECIMAL", "NUMERIC", "REAL", "NUMBER", |
| 116 | + "MONEY", "SMALLMONEY", |
| 117 | + "FLOAT32", "FLOAT64", |
| 118 | + "DECIMAL32", "DECIMAL64", "DECIMAL128", "DECIMAL256", |
| 119 | + "BINARY_FLOAT", "BINARY_DOUBLE", |
| 120 | + "DOUBLE PRECISION" |
| 121 | + ] { |
| 122 | + map[key] = { .decimal(rawType: $0) } |
| 123 | + } |
| 124 | + |
| 125 | + // Date |
| 126 | + for key in ["DATE", "DATE32"] { |
| 127 | + map[key] = { .date(rawType: $0) } |
| 128 | + } |
| 129 | + |
| 130 | + // Timestamp |
| 131 | + for key in [ |
| 132 | + "TIMESTAMP", "TIMESTAMPTZ", "TIMESTAMP_TZ", "TIMESTAMP_NTZ", |
| 133 | + "TIMESTAMP_S", "TIMESTAMP_MS", "TIMESTAMP_NS", |
| 134 | + "TIME", "TIMETZ" |
| 135 | + ] { |
| 136 | + map[key] = { .timestamp(rawType: $0) } |
| 137 | + } |
| 138 | + |
| 139 | + // Datetime |
| 140 | + for key in [ |
| 141 | + "DATETIME", "DATETIME2", "DATETIME64", |
| 142 | + "DATETIMEOFFSET", "SMALLDATETIME" |
| 143 | + ] { |
| 144 | + map[key] = { .datetime(rawType: $0) } |
| 145 | + } |
| 146 | + |
| 147 | + // JSON |
| 148 | + for key in ["JSON", "JSONB"] { |
| 149 | + map[key] = { .json(rawType: $0) } |
| 150 | + } |
| 151 | + |
| 152 | + // Blob |
| 153 | + for key in [ |
| 154 | + "BLOB", "BYTEA", "BINARY", "VARBINARY", "RAW", "IMAGE", |
| 155 | + "TINYBLOB", "MEDIUMBLOB", "LONGBLOB" |
| 156 | + ] { |
| 157 | + map[key] = { .blob(rawType: $0) } |
| 158 | + } |
| 159 | + |
| 160 | + // Enum |
| 161 | + for key in ["ENUM", "ENUM8", "ENUM16"] { |
| 162 | + map[key] = { .enumType(rawType: $0, values: nil) } |
| 163 | + } |
| 164 | + |
| 165 | + // Set |
| 166 | + map["SET"] = { .set(rawType: $0, values: nil) } |
| 167 | + |
| 168 | + // Spatial |
| 169 | + for key in [ |
| 170 | + "GEOMETRY", "POINT", "LINESTRING", "POLYGON", |
| 171 | + "MULTIPOINT", "MULTILINESTRING", "MULTIPOLYGON", |
| 172 | + "GEOGRAPHY", "GEOMETRYCOLLECTION" |
| 173 | + ] { |
| 174 | + map[key] = { .spatial(rawType: $0) } |
| 175 | + } |
| 176 | + |
| 177 | + // Text (explicit entries for common types not caught by fallback) |
| 178 | + for key in [ |
| 179 | + "TEXT", "VARCHAR", "CHAR", "NVARCHAR", "NCHAR", "NTEXT", |
| 180 | + "VARCHAR2", "CLOB", "NCLOB", |
| 181 | + "STRING", "FIXEDSTRING", |
| 182 | + "UUID", "UNIQUEIDENTIFIER", "SQL_VARIANT", |
| 183 | + "TINYTEXT", "MEDIUMTEXT", "LONGTEXT" |
| 184 | + ] { |
| 185 | + map[key] = { .text(rawType: $0) } |
| 186 | + } |
| 187 | + |
| 188 | + return map |
| 189 | + }() |
| 190 | +} |
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