syn_solidity/type/
mod.rs

1use crate::{SolPath, Spanned, kw, sol_path};
2use proc_macro2::Span;
3use std::{
4    fmt,
5    fmt::Write,
6    hash::{Hash, Hasher},
7    num::{IntErrorKind, NonZeroU16},
8};
9use syn::{
10    Error, Ident, Result, Token,
11    ext::IdentExt,
12    parse::{Lookahead1, Parse, ParseStream},
13    token::{Bracket, Paren},
14};
15
16mod array;
17pub use array::TypeArray;
18
19mod function;
20pub use function::TypeFunction;
21
22mod mapping;
23pub use mapping::TypeMapping;
24
25mod tuple;
26pub use tuple::TypeTuple;
27
28/// A type name.
29///
30/// Solidity reference:
31/// <https://docs.soliditylang.org/en/latest/grammar.html#a4.SolidityParser.typeName>
32#[derive(Clone)]
33pub enum Type {
34    // TODO: `fixed` and `ufixed`
35    /// `address $(payable)?`
36    Address(Span, Option<kw::payable>),
37    /// `bool`
38    Bool(Span),
39    /// `string`
40    String(Span),
41
42    /// `bytes`
43    Bytes(Span),
44    /// `bytes<size>`
45    FixedBytes(Span, NonZeroU16),
46
47    /// `int[size]`
48    Int(Span, Option<NonZeroU16>),
49    /// `uint[size]`
50    Uint(Span, Option<NonZeroU16>),
51
52    /// `$ty[$($size)?]`
53    Array(TypeArray),
54    /// `$(tuple)? ( $($types,)* )`
55    Tuple(TypeTuple),
56    /// `function($($arguments),*) $($attributes)* $(returns ($($returns),+))?`
57    Function(TypeFunction),
58    /// `mapping($key $($key_name)? => $value $($value_name)?)`
59    Mapping(TypeMapping),
60
61    /// A custom type.
62    Custom(SolPath),
63}
64
65impl PartialEq for Type {
66    fn eq(&self, other: &Self) -> bool {
67        match (self, other) {
68            (Self::Address(..), Self::Address(..)) => true,
69            (Self::Bool(_), Self::Bool(_)) => true,
70            (Self::String(_), Self::String(_)) => true,
71            (Self::Bytes { .. }, Self::Bytes { .. }) => true,
72
73            (Self::FixedBytes(_, a), Self::FixedBytes(_, b)) => a == b,
74            (Self::Int(_, a), Self::Int(_, b)) => a == b,
75            (Self::Uint(_, a), Self::Uint(_, b)) => a == b,
76
77            (Self::Tuple(a), Self::Tuple(b)) => a == b,
78            (Self::Array(a), Self::Array(b)) => a == b,
79            (Self::Function(a), Self::Function(b)) => a == b,
80            (Self::Mapping(a), Self::Mapping(b)) => a == b,
81            (Self::Custom(a), Self::Custom(b)) => a == b,
82
83            _ => false,
84        }
85    }
86}
87
88impl Eq for Type {}
89
90impl Hash for Type {
91    fn hash<H: Hasher>(&self, state: &mut H) {
92        std::mem::discriminant(self).hash(state);
93        match self {
94            Self::Address(..) | Self::Bool(_) | Self::String(_) | Self::Bytes(_) => {}
95
96            Self::FixedBytes(_, size) => size.hash(state),
97            Self::Int(_, size) => size.hash(state),
98            Self::Uint(_, size) => size.hash(state),
99
100            Self::Tuple(tuple) => tuple.hash(state),
101            Self::Array(array) => array.hash(state),
102            Self::Function(function) => function.hash(state),
103            Self::Mapping(mapping) => mapping.hash(state),
104            Self::Custom(custom) => custom.hash(state),
105        }
106    }
107}
108
109impl fmt::Debug for Type {
110    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
111        f.write_str("Type::")?;
112        match self {
113            Self::Address(_, None) => f.write_str("Address"),
114            Self::Address(_, Some(_)) => f.write_str("AddressPayable"),
115            Self::Bool(_) => f.write_str("Bool"),
116            Self::String(_) => f.write_str("String"),
117            Self::Bytes(_) => f.write_str("Bytes"),
118
119            Self::FixedBytes(_, size) => f.debug_tuple("FixedBytes").field(size).finish(),
120            Self::Int(_, size) => f.debug_tuple("Int").field(size).finish(),
121            Self::Uint(_, size) => f.debug_tuple("Uint").field(size).finish(),
122
123            Self::Tuple(tuple) => tuple.fmt(f),
124            Self::Array(array) => array.fmt(f),
125            Self::Function(function) => function.fmt(f),
126            Self::Mapping(mapping) => mapping.fmt(f),
127            Self::Custom(custom) => f.debug_tuple("Custom").field(custom).finish(),
128        }
129    }
130}
131
132/// Canonical type name formatting, used in selector preimages.
133impl fmt::Display for Type {
134    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
135        match self {
136            Self::Address(_, _) => f.write_str("address"),
137            Self::Bool(_) => f.write_str("bool"),
138            Self::String(_) => f.write_str("string"),
139            Self::Bytes(_) => f.write_str("bytes"),
140
141            Self::FixedBytes(_, size) => write!(f, "bytes{size}"),
142            Self::Int(_, size) => write_opt(f, "int", *size),
143            Self::Uint(_, size) => write_opt(f, "uint", *size),
144
145            Self::Tuple(tuple) => tuple.fmt(f),
146            Self::Array(array) => array.fmt(f),
147            Self::Function(_) => f.write_str("function"),
148            Self::Mapping(mapping) => mapping.fmt(f),
149            Self::Custom(custom) => custom.fmt(f),
150        }
151    }
152}
153
154impl Parse for Type {
155    fn parse(input: ParseStream<'_>) -> Result<Self> {
156        let mut candidate = Self::parse_simple(input)?;
157
158        // while the next token is a bracket, parse an array size and nest the
159        // candidate into an array
160        while input.peek(Bracket) {
161            candidate = Self::Array(TypeArray::parse_nested(Box::new(candidate), input)?);
162        }
163
164        Ok(candidate)
165    }
166}
167
168impl Spanned for Type {
169    fn span(&self) -> Span {
170        match self {
171            &Self::Address(span, payable) => {
172                payable.and_then(|kw| span.join(kw.span)).unwrap_or(span)
173            }
174            Self::Bool(span)
175            | Self::String(span)
176            | Self::Bytes(span)
177            | Self::FixedBytes(span, _)
178            | Self::Int(span, _)
179            | Self::Uint(span, _) => *span,
180            Self::Tuple(tuple) => tuple.span(),
181            Self::Array(array) => array.span(),
182            Self::Function(function) => function.span(),
183            Self::Mapping(mapping) => mapping.span(),
184            Self::Custom(custom) => custom.span(),
185        }
186    }
187
188    fn set_span(&mut self, new_span: Span) {
189        match self {
190            Self::Address(span, payable) => {
191                *span = new_span;
192                if let Some(kw) = payable {
193                    kw.span = new_span;
194                }
195            }
196            Self::Bool(span)
197            | Self::String(span)
198            | Self::Bytes(span)
199            | Self::FixedBytes(span, _)
200            | Self::Int(span, _)
201            | Self::Uint(span, _) => *span = new_span,
202
203            Self::Tuple(tuple) => tuple.set_span(new_span),
204            Self::Array(array) => array.set_span(new_span),
205            Self::Function(function) => function.set_span(new_span),
206            Self::Mapping(mapping) => mapping.set_span(new_span),
207            Self::Custom(custom) => custom.set_span(new_span),
208        }
209    }
210}
211
212impl Type {
213    pub fn custom(ident: Ident) -> Self {
214        Self::Custom(sol_path![ident])
215    }
216
217    pub fn peek(lookahead: &Lookahead1<'_>) -> bool {
218        lookahead.peek(syn::token::Paren)
219            || lookahead.peek(kw::tuple)
220            || lookahead.peek(kw::function)
221            || lookahead.peek(kw::mapping)
222            || lookahead.peek(Ident::peek_any)
223    }
224
225    /// Parses an identifier as an [elementary type name][ref].
226    ///
227    /// Note that you will have to check for the existence of a `payable`
228    /// keyword separately.
229    ///
230    /// [ref]: https://docs.soliditylang.org/en/latest/grammar.html#a4.SolidityParser.elementaryTypeName
231    pub fn parse_ident(ident: Ident) -> Self {
232        Self::try_parse_ident(ident.clone()).unwrap_or_else(|_| Self::custom(ident))
233    }
234
235    pub fn try_parse_ident(ident: Ident) -> Result<Self> {
236        let span = ident.span();
237        let s = ident.to_string();
238        let ret = match s.as_str() {
239            "address" => Self::Address(span, None),
240            "bool" => Self::Bool(span),
241            "string" => Self::String(span),
242            s => {
243                if let Some(s) = s.strip_prefix("bytes") {
244                    match parse_size(s, span)? {
245                        None => Self::custom(ident),
246                        Some(Some(size)) if size.get() > 32 => {
247                            return Err(Error::new(span, "fixed bytes range is 1-32"));
248                        }
249                        Some(Some(size)) => Self::FixedBytes(span, size),
250                        Some(None) => Self::Bytes(span),
251                    }
252                } else if let Some(s) = s.strip_prefix("int") {
253                    match parse_size(s, span)? {
254                        None => Self::custom(ident),
255                        Some(Some(size)) if size.get() > 256 || size.get() % 8 != 0 => {
256                            return Err(Error::new(span, "intX must be a multiple of 8 up to 256"));
257                        }
258                        Some(size) => Self::Int(span, size),
259                    }
260                } else if let Some(s) = s.strip_prefix("uint") {
261                    match parse_size(s, span)? {
262                        None => Self::custom(ident),
263                        Some(Some(size)) if size.get() > 256 || size.get() % 8 != 0 => {
264                            return Err(Error::new(
265                                span,
266                                "uintX must be a multiple of 8 up to 256",
267                            ));
268                        }
269                        Some(size) => Self::Uint(span, size),
270                    }
271                } else {
272                    Self::custom(ident)
273                }
274            }
275        };
276        Ok(ret)
277    }
278
279    /// Parses the `payable` keyword from the input stream if this type is an
280    /// address.
281    pub fn parse_payable(mut self, input: ParseStream<'_>) -> Self {
282        if let Self::Address(_, opt @ None) = &mut self {
283            *opt = input.parse().unwrap();
284        }
285        self
286    }
287
288    /// Returns whether this type is dynamic according to ABI rules.
289    ///
290    /// Note that this does not account for custom types, such as UDVTs.
291    pub fn is_abi_dynamic(&self) -> bool {
292        match self {
293            Self::Bool(_)
294            | Self::Int(..)
295            | Self::Uint(..)
296            | Self::FixedBytes(..)
297            | Self::Address(..)
298            | Self::Function(_) => false,
299
300            Self::String(_) | Self::Bytes(_) | Self::Custom(_) => true,
301
302            Self::Array(array) => array.is_abi_dynamic(),
303            Self::Tuple(tuple) => tuple.is_abi_dynamic(),
304
305            // not applicable
306            Self::Mapping(_) => true,
307        }
308    }
309
310    /// Returns whether this type is a value type.
311    ///
312    /// These types' variables are always passed by value.
313    ///
314    /// `custom_is_value_type` accounts for custom value types.
315    ///
316    /// See the [Solidity docs](https://docs.soliditylang.org/en/latest/types.html#value-types) for more information.
317    pub fn is_value_type(&self, custom_is_value_type: impl Fn(&SolPath) -> bool) -> bool {
318        match self {
319            Self::Custom(custom) => custom_is_value_type(custom),
320            _ => self.is_value_type_simple(),
321        }
322    }
323
324    /// Returns whether this type is a simple value type.
325    ///
326    /// See [`is_value_type`](Self::is_value_type) for more information.
327    pub fn is_value_type_simple(&self) -> bool {
328        matches!(
329            self,
330            Self::Bool(_)
331                | Self::Int(..)
332                | Self::Uint(..)
333                | Self::FixedBytes(..)
334                | Self::Address(..)
335                | Self::Function(_)
336        )
337    }
338
339    pub const fn is_array(&self) -> bool {
340        matches!(self, Self::Array(_))
341    }
342
343    pub const fn is_tuple(&self) -> bool {
344        matches!(self, Self::Tuple(_))
345    }
346
347    pub const fn is_custom(&self) -> bool {
348        matches!(self, Self::Custom(_))
349    }
350
351    /// Recurses into this type and returns whether it contains a custom type.
352    pub fn has_custom(&self) -> bool {
353        match self {
354            Self::Custom(_) => true,
355            Self::Array(a) => a.ty.has_custom(),
356            Self::Tuple(t) => t.types.iter().any(Self::has_custom),
357            Self::Function(f) => {
358                f.arguments.iter().any(|arg| arg.ty.has_custom())
359                    || f.returns
360                        .as_ref()
361                        .is_some_and(|ret| ret.returns.iter().any(|arg| arg.ty.has_custom()))
362            }
363            Self::Mapping(m) => m.key.has_custom() || m.value.has_custom(),
364            Self::Bool(_)
365            | Self::Int(..)
366            | Self::Uint(..)
367            | Self::FixedBytes(..)
368            | Self::Address(..)
369            | Self::String(_)
370            | Self::Bytes(_) => false,
371        }
372    }
373
374    /// Same as [`has_custom`](Self::has_custom), but `Function` returns `false`
375    /// rather than recursing into its arguments and return types.
376    pub fn has_custom_simple(&self) -> bool {
377        match self {
378            Self::Custom(_) => true,
379            Self::Array(a) => a.ty.has_custom_simple(),
380            Self::Tuple(t) => t.types.iter().any(Self::has_custom_simple),
381            Self::Mapping(m) => m.key.has_custom_simple() || m.value.has_custom_simple(),
382            Self::Bool(_)
383            | Self::Int(..)
384            | Self::Uint(..)
385            | Self::FixedBytes(..)
386            | Self::Address(..)
387            | Self::Function(_)
388            | Self::String(_)
389            | Self::Bytes(_) => false,
390        }
391    }
392
393    /// Returns the inner type.
394    pub fn peel_arrays(&self) -> &Self {
395        let mut this = self;
396        while let Self::Array(array) = this {
397            this = &array.ty;
398        }
399        this
400    }
401
402    /// Returns the Solidity ABI name for this type. This is `tuple` for custom types, otherwise the
403    /// same as [`Display`](fmt::Display).
404    pub fn abi_name(&self) -> String {
405        let mut s = String::new();
406        self.abi_name_raw(&mut s);
407        s
408    }
409
410    /// Returns the Solidity ABI name for this type. This is `tuple` for custom types, otherwise the
411    /// same as [`Display`](fmt::Display).
412    pub fn abi_name_raw(&self, s: &mut String) {
413        match self {
414            Self::Custom(_) => s.push_str("tuple"),
415            Self::Array(array) => {
416                array.ty.abi_name_raw(s);
417                if let Some(size) = array.size() {
418                    write!(s, "[{size}]").unwrap();
419                } else {
420                    s.push_str("[]");
421                }
422            }
423            _ => write!(s, "{self}").unwrap(),
424        }
425    }
426
427    /// Traverses this type while calling `f`.
428    #[cfg(feature = "visit")]
429    pub fn visit(&self, f: impl FnMut(&Self)) {
430        use crate::Visit;
431        struct VisitType<F>(F);
432        impl<F: FnMut(&Type)> Visit<'_> for VisitType<F> {
433            fn visit_type(&mut self, ty: &Type) {
434                (self.0)(ty);
435                crate::visit::visit_type(self, ty);
436            }
437            // Reduce generated code size by explicitly implementing these methods as noops.
438            fn visit_block(&mut self, _block: &crate::Block) {}
439            fn visit_expr(&mut self, _expr: &crate::Expr) {}
440            fn visit_stmt(&mut self, _stmt: &crate::Stmt) {}
441            fn visit_file(&mut self, _file: &crate::File) {}
442            fn visit_item(&mut self, _item: &crate::Item) {}
443        }
444        VisitType(f).visit_type(self);
445    }
446
447    /// Traverses this type while calling `f`.
448    #[cfg(feature = "visit-mut")]
449    pub fn visit_mut(&mut self, f: impl FnMut(&mut Self)) {
450        use crate::VisitMut;
451        struct VisitTypeMut<F>(F);
452        impl<F: FnMut(&mut Type)> VisitMut<'_> for VisitTypeMut<F> {
453            fn visit_type(&mut self, ty: &mut Type) {
454                (self.0)(ty);
455                crate::visit_mut::visit_type(self, ty);
456            }
457            // Reduce generated code size by explicitly implementing these methods as noops.
458            fn visit_block(&mut self, _block: &mut crate::Block) {}
459            fn visit_expr(&mut self, _expr: &mut crate::Expr) {}
460            fn visit_stmt(&mut self, _stmt: &mut crate::Stmt) {}
461            fn visit_file(&mut self, _file: &mut crate::File) {}
462            fn visit_item(&mut self, _item: &mut crate::Item) {}
463        }
464        VisitTypeMut(f).visit_type(self);
465    }
466
467    /// Parses a type from the input, without recursing into arrays.
468    #[inline]
469    fn parse_simple(input: ParseStream<'_>) -> Result<Self> {
470        if input.peek(Paren) || input.peek(kw::tuple) {
471            input.parse().map(Self::Tuple)
472        } else if input.peek(kw::function) {
473            input.parse().map(Self::Function)
474        } else if input.peek(kw::mapping) {
475            input.parse().map(Self::Mapping)
476        } else if input.peek2(Token![.]) {
477            input.parse().map(Self::Custom)
478        } else if input.peek(Ident::peek_any) {
479            let ident = input.call(Ident::parse_any)?;
480            Ok(Self::parse_ident(ident).parse_payable(input))
481        } else {
482            Err(input.error(
483                "expected a Solidity type: \
484                 `address`, `bool`, `string`, `bytesN`, `intN`, `uintN`, \
485                 `tuple`, `function`, `mapping`, or a custom type name",
486            ))
487        }
488    }
489}
490
491fn write_opt(f: &mut fmt::Formatter<'_>, name: &str, size: Option<NonZeroU16>) -> fmt::Result {
492    f.write_str(name)?;
493    if let Some(size) = size {
494        write!(f, "{size}")?;
495    }
496    Ok(())
497}
498
499// None => Custom
500// Some(size) => size
501fn parse_size(s: &str, span: Span) -> Result<Option<Option<NonZeroU16>>> {
502    let opt = match s.parse::<NonZeroU16>() {
503        Ok(size) => Some(Some(size)),
504        Err(e) => match e.kind() {
505            // bytes
506            IntErrorKind::Empty => Some(None),
507            // bytes_
508            IntErrorKind::InvalidDigit => None,
509            // bytesN where N == 0 || N > MAX
510            _ => return Err(Error::new(span, format_args!("invalid size: {e}"))),
511        },
512    };
513    Ok(opt)
514}
syn_solidity/type/mod.rs

syn_solidity/type/
mod.rs
