tank_core/
value.rs

1use crate::{AsValue, Error, Result, interval::Interval};
2use proc_macro2::TokenStream;
3use quote::{ToTokens, quote};
4use rust_decimal::Decimal;
5use std::{collections::HashMap, hash::Hash, mem::discriminant};
6use time::{Date, OffsetDateTime, PrimitiveDateTime, Time};
7use uuid::Uuid;
8
9/// Strongly-typed, nullable SQL value representation used across Tank.
10///
11/// Variants wrap `Option<T>` – `None` signifies SQL NULL (except `Null` which
12/// unconditionally represents a NULL of unknown type). Complex variants carry
13/// additional shape metadata (element type, length, precision, etc.).
14#[derive(Default, Debug, Clone)]
15pub enum Value {
16    /// Untyped NULL placeholder.
17    #[default]
18    Null,
19    Boolean(Option<bool>),
20    Int8(Option<i8>),
21    Int16(Option<i16>),
22    Int32(Option<i32>),
23    Int64(Option<i64>),
24    Int128(Option<i128>),
25    UInt8(Option<u8>),
26    UInt16(Option<u16>),
27    UInt32(Option<u32>),
28    UInt64(Option<u64>),
29    UInt128(Option<u128>),
30    Float32(Option<f32>),
31    Float64(Option<f64>),
32    /// Arbitrary precision decimal with width/scale hints.
33    Decimal(Option<Decimal>, /* width: */ u8, /* scale: */ u8),
34    Char(Option<char>),
35    Varchar(Option<String>),
36    Blob(Option<Box<[u8]>>),
37    Date(Option<Date>),
38    Time(Option<Time>),
39    Timestamp(Option<PrimitiveDateTime>),
40    TimestampWithTimezone(Option<OffsetDateTime>),
41    Interval(Option<Interval>),
42    Uuid(Option<Uuid>),
43    /// Fixed-size homogeneous array.
44    Array(
45        Option<Box<[Value]>>,
46        /* type: */ Box<Value>,
47        /* len: */ u32,
48    ),
49    /// Variable length homogeneous list.
50    List(Option<Vec<Value>>, /* type: */ Box<Value>),
51    /// Map with homogeneous key/value types.
52    Map(
53        Option<HashMap<Value, Value>>,
54        /* key: */ Box<Value>,
55        /* value: */ Box<Value>,
56    ),
57    /// Struct with named fields and their types.
58    Struct(
59        Option<Vec<(String, Value)>>,
60        /* type: */ Vec<(String, Value)>,
61    ),
62    /// Parsing fallback / unknown driver-provided type.
63    Unknown(Option<String>),
64}
65
66impl Value {
67    pub fn same_type(&self, other: &Self) -> bool {
68        match (self, other) {
69            (Self::Decimal(.., l_width, l_scale), Self::Decimal(.., r_width, r_scale)) => {
70                (*l_width == 0 || *r_width == 0 || l_width == r_width)
71                    && (*l_scale == 0 || *r_scale == 0 || l_scale == r_scale)
72            }
73            (Self::Array(.., l_type, l_len), Self::Array(.., r_type, r_len)) => {
74                l_len == r_len && l_type.same_type(&r_type)
75            }
76            (Self::List(.., l), Self::List(.., r)) => l.same_type(r),
77            (Self::Map(.., l_key, l_value), Self::Map(.., r_key, r_value)) => {
78                l_key.same_type(r_key) && l_value.same_type(&r_value)
79            }
80            _ => discriminant(self) == discriminant(other),
81        }
82    }
83
84    pub fn is_null(&self) -> bool {
85        match self {
86            Value::Null
87            | Value::Boolean(None, ..)
88            | Value::Int8(None, ..)
89            | Value::Int16(None, ..)
90            | Value::Int32(None, ..)
91            | Value::Int64(None, ..)
92            | Value::Int128(None, ..)
93            | Value::UInt8(None, ..)
94            | Value::UInt16(None, ..)
95            | Value::UInt32(None, ..)
96            | Value::UInt64(None, ..)
97            | Value::UInt128(None, ..)
98            | Value::Float32(None, ..)
99            | Value::Float64(None, ..)
100            | Value::Decimal(None, ..)
101            | Value::Char(None, ..)
102            | Value::Varchar(None, ..)
103            | Value::Blob(None, ..)
104            | Value::Date(None, ..)
105            | Value::Time(None, ..)
106            | Value::Timestamp(None, ..)
107            | Value::TimestampWithTimezone(None, ..)
108            | Value::Interval(None, ..)
109            | Value::Uuid(None, ..)
110            | Value::Array(None, ..)
111            | Value::List(None, ..)
112            | Value::Map(None, ..)
113            | Value::Struct(None, ..)
114            | Value::Unknown(None, ..) => true,
115            _ => false,
116        }
117    }
118
119    pub fn as_null(&self) -> Value {
120        match self {
121            Value::Null => Value::Null,
122            Value::Boolean(..) => Value::Boolean(None),
123            Value::Int8(..) => Value::Int8(None),
124            Value::Int16(..) => Value::Int16(None),
125            Value::Int32(..) => Value::Int32(None),
126            Value::Int64(..) => Value::Int64(None),
127            Value::Int128(..) => Value::Int128(None),
128            Value::UInt8(..) => Value::UInt8(None),
129            Value::UInt16(..) => Value::UInt16(None),
130            Value::UInt32(..) => Value::UInt32(None),
131            Value::UInt64(..) => Value::UInt64(None),
132            Value::UInt128(..) => Value::UInt128(None),
133            Value::Float32(..) => Value::Float32(None),
134            Value::Float64(..) => Value::Float64(None),
135            Value::Decimal(.., w, s) => Value::Decimal(None, *w, *s),
136            Value::Char(..) => Value::Char(None),
137            Value::Varchar(..) => Value::Varchar(None),
138            Value::Blob(..) => Value::Blob(None),
139            Value::Date(..) => Value::Date(None),
140            Value::Time(..) => Value::Time(None),
141            Value::Timestamp(..) => Value::Timestamp(None),
142            Value::TimestampWithTimezone(..) => Value::TimestampWithTimezone(None),
143            Value::Interval(..) => Value::Interval(None),
144            Value::Uuid(..) => Value::Uuid(None),
145            Value::Array(.., t, len) => Value::Array(None, t.clone(), *len),
146            Value::List(.., t) => Value::List(None, t.clone()),
147            Value::Map(.., k, v) => Value::Map(None, k.clone(), v.clone()),
148            Value::Struct(.., t) => Value::Struct(None, t.clone()),
149            Value::Unknown(..) => Value::Unknown(None),
150        }
151    }
152
153    pub fn try_as(self, value: &Value) -> Result<Value> {
154        if self.same_type(value) {
155            return Ok(self);
156        }
157        match value {
158            Value::Boolean(..) => bool::try_from_value(self).map(AsValue::as_value),
159            Value::Int8(..) => i8::try_from_value(self).map(AsValue::as_value),
160            Value::Int16(..) => i16::try_from_value(self).map(AsValue::as_value),
161            Value::Int32(..) => i32::try_from_value(self).map(AsValue::as_value),
162            Value::Int64(..) => i64::try_from_value(self).map(AsValue::as_value),
163            Value::Int128(..) => i128::try_from_value(self).map(AsValue::as_value),
164            Value::UInt8(..) => u8::try_from_value(self).map(AsValue::as_value),
165            Value::UInt16(..) => u16::try_from_value(self).map(AsValue::as_value),
166            Value::UInt32(..) => u32::try_from_value(self).map(AsValue::as_value),
167            Value::UInt64(..) => u64::try_from_value(self).map(AsValue::as_value),
168            Value::UInt128(..) => u128::try_from_value(self).map(AsValue::as_value),
169            Value::Float32(..) => f32::try_from_value(self).map(AsValue::as_value),
170            Value::Float64(..) => f64::try_from_value(self).map(AsValue::as_value),
171            Value::Decimal(..) => Decimal::try_from_value(self).map(AsValue::as_value),
172            Value::Char(..) => char::try_from_value(self).map(AsValue::as_value),
173            Value::Varchar(..) => String::try_from_value(self).map(AsValue::as_value),
174            Value::Blob(..) => Box::<[u8]>::try_from_value(self).map(AsValue::as_value),
175            Value::Date(..) => Date::try_from_value(self).map(AsValue::as_value),
176            Value::Time(..) => Time::try_from_value(self).map(AsValue::as_value),
177            Value::Timestamp(..) => PrimitiveDateTime::try_from_value(self).map(AsValue::as_value),
178            Value::TimestampWithTimezone(..) => {
179                OffsetDateTime::try_from_value(self).map(AsValue::as_value)
180            }
181            Value::Interval(..) => Interval::try_from_value(self).map(AsValue::as_value),
182            Value::Uuid(..) => Uuid::try_from_value(self).map(AsValue::as_value),
183            // Value::Array(.., ty, len) => {
184            //     Box::<[Value]>::try_from_value(self).map(AsValue::as_value)
185            // }
186            // Value::List(..) => Box::<[Value]>::try_from_value(self).map(AsValue::as_value),
187            // Value::Map(..) => Date::try_from_value(self).map(AsValue::as_value),
188            _ => {
189                return Err(Error::msg(format!(
190                    "Cannot convert value {:?} into value {:?}",
191                    self, value
192                )));
193            }
194        }
195    }
196}
197
198impl PartialEq for Value {
199    fn eq(&self, other: &Self) -> bool {
200        match (self, other) {
201            (Self::Null, Self::Null) => true,
202            (Self::Boolean(l), Self::Boolean(r)) => l == r,
203            (Self::Int8(l), Self::Int8(r)) => l == r,
204            (Self::Int16(l), Self::Int16(r)) => l == r,
205            (Self::Int32(l), Self::Int32(r)) => l == r,
206            (Self::Int64(l), Self::Int64(r)) => l == r,
207            (Self::Int128(l), Self::Int128(r)) => l == r,
208            (Self::UInt8(l), Self::UInt8(r)) => l == r,
209            (Self::UInt16(l), Self::UInt16(r)) => l == r,
210            (Self::UInt32(l), Self::UInt32(r)) => l == r,
211            (Self::UInt64(l), Self::UInt64(r)) => l == r,
212            (Self::UInt128(l), Self::UInt128(r)) => l == r,
213            (Self::Float32(l), Self::Float32(r)) => {
214                l == r
215                    || l.and_then(|l| r.and_then(|r| Some(l.is_nan() && r.is_nan())))
216                        .unwrap_or_default()
217            }
218            (Self::Float64(l), Self::Float64(r)) => {
219                l == r
220                    || l.and_then(|l| r.and_then(|r| Some(l.is_nan() && r.is_nan())))
221                        .unwrap_or_default()
222            }
223            (Self::Decimal(l, l_width, l_scale), Self::Decimal(r, r_width, r_scale)) => {
224                l == r && l_width == r_width && l_scale == r_scale
225            }
226            (Self::Char(l), Self::Char(r)) => l == r,
227            (Self::Varchar(l), Self::Varchar(r)) => l == r,
228            (Self::Blob(l), Self::Blob(r)) => l == r,
229            (Self::Date(l), Self::Date(r)) => l == r,
230            (Self::Time(l), Self::Time(r)) => l == r,
231            (Self::Timestamp(l), Self::Timestamp(r)) => l == r,
232            (Self::TimestampWithTimezone(l), Self::TimestampWithTimezone(r)) => l == r,
233            (Self::Interval(l), Self::Interval(r)) => l == r,
234            (Self::Uuid(l), Self::Uuid(r)) => l == r,
235            (Self::Array(l, ..), Self::Array(r, ..)) => l == r && self.same_type(other),
236            (Self::List(l, ..), Self::List(r, ..)) => l == r && self.same_type(other),
237            (Self::Map(None, ..), Self::Map(None, ..)) => self.same_type(other),
238            (Self::Map(Some(l), ..), Self::Map(Some(r), ..)) => {
239                l.is_empty() == r.is_empty() && self.same_type(other)
240            }
241            (Self::Map(..), Self::Map(..)) => self.same_type(other),
242            (Self::Unknown(..), Self::Unknown(..)) => false,
243            _ => false,
244        }
245    }
246}
247
248impl Eq for Value {}
249
250impl Hash for Value {
251    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
252        use Value::*;
253        discriminant(self).hash(state);
254        match self {
255            Null => {}
256            Boolean(v) => v.hash(state),
257            Int8(v) => v.hash(state),
258            Int16(v) => v.hash(state),
259            Int32(v) => v.hash(state),
260            Int64(v) => v.hash(state),
261            Int128(v) => v.hash(state),
262
263            UInt8(v) => v.hash(state),
264            UInt16(v) => v.hash(state),
265            UInt32(v) => v.hash(state),
266            UInt64(v) => v.hash(state),
267            UInt128(v) => v.hash(state),
268            Float32(Some(v)) => {
269                v.to_bits().hash(state);
270            }
271            Float32(None) => None::<u32>.hash(state),
272            Float64(Some(v)) => {
273                v.to_bits().hash(state);
274            }
275            Float64(None) => None::<u64>.hash(state),
276            Decimal(v, width, scale) => {
277                v.hash(state);
278                width.hash(state);
279                scale.hash(state);
280            }
281            Char(v) => v.hash(state),
282            Varchar(v) => v.hash(state),
283            Blob(v) => v.hash(state),
284            Date(v) => v.hash(state),
285            Time(v) => v.hash(state),
286            Timestamp(v) => v.hash(state),
287            TimestampWithTimezone(v) => v.hash(state),
288            Interval(v) => v.hash(state),
289            Uuid(v) => v.hash(state),
290            Array(v, typ, len) => {
291                v.hash(state);
292                typ.hash(state);
293                len.hash(state);
294            }
295            List(v, typ) => {
296                v.hash(state);
297                typ.hash(state);
298            }
299            Map(v, key, val) => {
300                match v {
301                    Some(map) => {
302                        for (key, val) in map {
303                            key.hash(state);
304                            val.hash(state);
305                        }
306                    }
307                    None => {}
308                }
309                key.hash(state);
310                val.hash(state);
311            }
312            Struct(v, t) => {
313                match v {
314                    Some(v) => v.hash(state),
315                    None => {}
316                }
317                t.hash(state);
318            }
319            Unknown(v) => v.hash(state),
320        }
321    }
322}
323
324/// Intermediate decoded type information used by derive macros.
325#[derive(Default)]
326pub struct TypeDecoded {
327    /// Representative value establishing variant & metadata.
328    pub value: Value,
329    /// Nullability indicator.
330    pub nullable: bool,
331    /// Passive flag (exclude from INSERT column/value list).
332    pub passive: bool,
333}
334
335pub type CheckPassive = Box<dyn Fn(TokenStream) -> TokenStream>;
336
337impl ToTokens for Value {
338    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
339        let ts = match self {
340            Value::Null => quote!(::tank::Value::Null),
341            Value::Boolean(..) => quote!(::tank::Value::Boolean(None)),
342            Value::Int8(..) => quote!(::tank::Value::Int8(None)),
343            Value::Int16(..) => quote!(::tank::Value::Int16(None)),
344            Value::Int32(..) => quote!(::tank::Value::Int32(None)),
345            Value::Int64(..) => quote!(::tank::Value::Int64(None)),
346            Value::Int128(..) => quote!(::tank::Value::Int128(None)),
347            Value::UInt8(..) => quote!(::tank::Value::UInt8(None)),
348            Value::UInt16(..) => quote!(::tank::Value::UInt16(None)),
349            Value::UInt32(..) => quote!(::tank::Value::UInt32(None)),
350            Value::UInt64(..) => quote!(::tank::Value::UInt64(None)),
351            Value::UInt128(..) => quote!(::tank::Value::UInt128(None)),
352            Value::Float32(..) => quote!(::tank::Value::Float32(None)),
353            Value::Float64(..) => quote!(::tank::Value::Float64(None)),
354            Value::Decimal(.., width, scale) => {
355                quote!(::tank::Value::Decimal(None, #width, #scale))
356            }
357            Value::Char(..) => quote!(tank::Value::Char(None)),
358            Value::Varchar(..) => quote!(::tank::Value::Varchar(None)),
359            Value::Blob(..) => quote!(::tank::Value::Blob(None)),
360            Value::Date(..) => quote!(::tank::Value::Date(None)),
361            Value::Time(..) => quote!(::tank::Value::Time(None)),
362            Value::Timestamp(..) => quote!(::tank::Value::Timestamp(None)),
363            Value::TimestampWithTimezone(..) => quote!(::tank::Value::TimestampWithTimezone(None)),
364            Value::Interval(..) => quote!(::tank::Value::Interval(None)),
365            Value::Uuid(..) => quote!(::tank::Value::Uuid(None)),
366            Value::Array(.., inner, size) => {
367                quote!(::tank::Value::Array(None, Box::new(#inner), #size))
368            }
369            Value::List(.., inner) => {
370                let inner = inner.as_ref().to_token_stream();
371                quote!(::tank::Value::List(None, Box::new(#inner)))
372            }
373            Value::Map(.., key, value) => {
374                let key = key.as_ref().to_token_stream();
375                let value = value.as_ref().to_token_stream();
376                quote!(::tank::Value::Map(None, Box::new(#key), Box::new(#value)))
377            }
378            Value::Struct(.., t) => {
379                let values = t.into_iter().map(|(k, v)| quote!((#k.into(), #v)));
380                quote!(::tank::Value::Struct(None, vec!(#(#values),*)))
381            }
382            Value::Unknown(..) => quote!(::tank::Value::Unknown(None)),
383        };
384        tokens.extend(ts);
385    }
386}
tank_core/value.rs

tank_core/
value.rs
