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-rw-r--r--.rustfmt.toml2
-rw-r--r--Cargo.lock49
-rw-r--r--dhall/src/phase/binary.rs28
-rw-r--r--dhall/src/phase/normalize.rs7
-rw-r--r--dhall/src/phase/resolve.rs1
-rw-r--r--dhall/src/phase/typecheck.rs8
-rw-r--r--dhall_proc_macros/Cargo.toml6
-rw-r--r--dhall_proc_macros/src/lib.rs19
-rw-r--r--dhall_proc_macros/src/make_parser.rs111
-rw-r--r--dhall_proc_macros/src/parse_children.rs212
-rw-r--r--dhall_syntax/Cargo.toml2
-rw-r--r--dhall_syntax/src/core/expr.rs9
-rw-r--r--dhall_syntax/src/lib.rs3
-rw-r--r--dhall_syntax/src/parser.rs1881
-rw-r--r--improved_slice_patterns/src/lib.rs25
-rw-r--r--rust-toolchain2
16 files changed, 1368 insertions, 997 deletions
diff --git a/.rustfmt.toml b/.rustfmt.toml
index 0713c39..ee91dbd 100644
--- a/.rustfmt.toml
+++ b/.rustfmt.toml
@@ -1,3 +1,3 @@
edition = "2018"
max_width = 80
-error_on_line_overflow = true
+# error_on_line_overflow = true
diff --git a/Cargo.lock b/Cargo.lock
index 9bd7adc..976b3c5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -95,9 +95,9 @@ name = "dhall_proc_macros"
version = "0.1.0"
dependencies = [
"itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.31 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@@ -105,9 +105,11 @@ name = "dhall_syntax"
version = "0.1.0"
dependencies = [
"dhall_generated_parser 0.1.0",
+ "dhall_proc_macros 0.1.0",
"either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
"hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
"itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
"percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"pest 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -181,6 +183,11 @@ dependencies = [
]
[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
name = "maplit"
version = "1.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -270,6 +277,14 @@ dependencies = [
]
[[package]]
+name = "proc-macro2"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
name = "quote"
version = "0.6.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -278,6 +293,14 @@ dependencies = [
]
[[package]]
+name = "quote"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
name = "same-file"
version = "1.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -345,6 +368,16 @@ dependencies = [
]
[[package]]
+name = "syn"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
name = "take_mut"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -387,6 +420,11 @@ version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
+name = "unicode-xid"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
name = "version_check"
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -457,6 +495,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7e81a7c05f79578dbc15793d8b619db9ba32b4577003ef3af1a91c416798c58d"
"checksum itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b8467d9c1cebe26feb08c640139247fac215782d35371ade9a2136ed6085358"
"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
+"checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
"checksum maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "08cbb6b4fef96b6d77bfc40ec491b1690c779e77b05cd9f07f787ed376fd4c43"
"checksum memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2efc7bc57c883d4a4d6e3246905283d8dae951bb3bd32f49d6ef297f546e1c39"
"checksum nom 4.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2ad2a91a8e869eeb30b9cb3119ae87773a8f4ae617f41b1eb9c154b2905f7bd6"
@@ -468,13 +507,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum pretty 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f60c0d9f6fc88ecdd245d90c1920ff76a430ab34303fc778d33b1d0a4c3bf6d3"
"checksum pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3f81e1644e1b54f5a68959a29aa86cde704219254669da328ecfdf6a1f09d427"
"checksum proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)" = "4d317f9caece796be1980837fd5cb3dfec5613ebdb04ad0956deea83ce168915"
+"checksum proc-macro2 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "175a40b9cf564ce9bf050654633dbf339978706b8ead1a907bb970b63185dd95"
"checksum quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "faf4799c5d274f3868a4aae320a0a182cbd2baee377b378f080e16a23e9d80db"
+"checksum quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe"
"checksum same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8f20c4be53a8a1ff4c1f1b2bd14570d2f634628709752f0702ecdd2b3f9a5267"
"checksum serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)" = "aa5f7c20820475babd2c077c3ab5f8c77a31c15e16ea38687b4c02d3e48680f4"
"checksum serde_cbor 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "45cd6d95391b16cd57e88b68be41d504183b7faae22030c0cc3b3f73dd57b2fd"
"checksum serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)" = "58fc82bec244f168b23d1963b45c8bf5726e9a15a9d146a067f9081aeed2de79"
"checksum sha-1 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "51b9d1f3b5de8a167ab06834a7c883bd197f2191e1dda1a22d9ccfeedbf9aded"
"checksum syn 0.15.31 (registry+https://github.com/rust-lang/crates.io-index)" = "d2b4cfac95805274c6afdb12d8f770fa2d27c045953e7b630a81801953699a9a"
+"checksum syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "66850e97125af79138385e9b88339cbcd037e3f28ceab8c5ad98e64f0f1f80bf"
"checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
"checksum term 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "fa63644f74ce96fbeb9b794f66aff2a52d601cbd5e80f4b97123e3899f4570f1"
"checksum term-painter 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "dcaa948f0e3e38470cd8dc8dcfe561a75c9e43f28075bb183845be2b9b3c08cf"
@@ -482,6 +524,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
"checksum ucd-trie 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "71a9c5b1fe77426cf144cc30e49e955270f5086e31a6441dfa8b32efc09b9d77"
"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
+"checksum unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
"checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
"checksum walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d9d7ed3431229a144296213105a390676cc49c9b6a72bd19f3176c98e129fa1"
"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
diff --git a/dhall/src/phase/binary.rs b/dhall/src/phase/binary.rs
index 16e7ce9..f271eb1 100644
--- a/dhall/src/phase/binary.rs
+++ b/dhall/src/phase/binary.rs
@@ -53,7 +53,7 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
let l = Label::from(l.as_str());
Var(V(l, *n as usize))
}
- [U64(0), f, args..] => {
+ [U64(0), f, args @ ..] => {
if args.is_empty() {
Err(DecodeError::WrongFormatError(
"Function application must have at least one argument"
@@ -127,7 +127,7 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
let t = cbor_value_to_dhall(&t)?;
EmptyListLit(rc(App(rc(ExprF::Builtin(Builtin::List)), t)))
}
- [U64(4), Null, rest..] => {
+ [U64(4), Null, rest @ ..] => {
let rest = rest
.iter()
.map(cbor_value_to_dhall)
@@ -175,7 +175,7 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
let l = Label::from(l.as_str());
Field(x, l)
}
- [U64(10), x, rest..] => {
+ [U64(10), x, rest @ ..] => {
let x = cbor_value_to_dhall(&x)?;
let labels = rest
.iter()
@@ -204,7 +204,7 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
[U64(15), U64(x)] => NaturalLit(*x as Natural),
[U64(16), U64(x)] => IntegerLit(*x as Integer),
[U64(16), I64(x)] => IntegerLit(*x as Integer),
- [U64(18), String(first), rest..] => {
+ [U64(18), String(first), rest @ ..] => {
TextLit(InterpolatedText::from((
first.clone(),
rest.iter()
@@ -226,7 +226,7 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
let t = cbor_value_to_dhall(&t)?;
Assert(t)
}
- [U64(24), hash, U64(mode), U64(scheme), rest..] => {
+ [U64(24), hash, U64(mode), U64(scheme), rest @ ..] => {
let mode = match mode {
0 => ImportMode::Code,
1 => ImportMode::RawText,
@@ -239,7 +239,9 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
let hash = match hash {
Null => None,
Bytes(bytes) => match bytes.as_slice() {
- [18, 32, rest..] => Some(Hash::SHA256(rest.to_vec())),
+ [18, 32, rest @ ..] => {
+ Some(Hash::SHA256(rest.to_vec()))
+ }
_ => Err(DecodeError::WrongFormatError(format!(
"import/hash/unknown_multihash: {:?}",
bytes
@@ -337,7 +339,7 @@ fn cbor_value_to_dhall(data: &cbor::Value) -> Result<DecodedExpr, DecodeError> {
location,
})
}
- [U64(25), bindings..] => {
+ [U64(25), bindings @ ..] => {
let mut tuples = bindings.iter().tuples();
let bindings = (&mut tuples)
.map(|(x, t, v)| {
@@ -481,13 +483,9 @@ where
BoolIf(x, y, z) => ser_seq!(ser; tag(14), expr(x), expr(y), expr(z)),
Var(V(l, n)) if l == &"_".into() => ser.serialize_u64(*n as u64),
Var(V(l, n)) => ser_seq!(ser; label(l), U64(*n as u64)),
- Lam(l, x, y) if l == &"_".into() => {
- ser_seq!(ser; tag(1), expr(x), expr(y))
- }
+ Lam(l, x, y) if l == &"_".into() => ser_seq!(ser; tag(1), expr(x), expr(y)),
Lam(l, x, y) => ser_seq!(ser; tag(1), label(l), expr(x), expr(y)),
- Pi(l, x, y) if l == &"_".into() => {
- ser_seq!(ser; tag(2), expr(x), expr(y))
- }
+ Pi(l, x, y) if l == &"_".into() => ser_seq!(ser; tag(2), expr(x), expr(y)),
Pi(l, x, y) => ser_seq!(ser; tag(2), label(l), expr(x), expr(y)),
Let(_, _, _, _) => {
let (bound_e, bindings) = collect_nested_lets(e);
@@ -559,9 +557,7 @@ where
ser_seq!(ser; tag(3), U64(op), expr(x), expr(y))
}
Merge(x, y, None) => ser_seq!(ser; tag(6), expr(x), expr(y)),
- Merge(x, y, Some(z)) => {
- ser_seq!(ser; tag(6), expr(x), expr(y), expr(z))
- }
+ Merge(x, y, Some(z)) => ser_seq!(ser; tag(6), expr(x), expr(y), expr(z)),
ToMap(x, None) => ser_seq!(ser; tag(27), expr(x)),
ToMap(x, Some(y)) => ser_seq!(ser; tag(27), expr(x), expr(y)),
Projection(x, ls) => ser.collect_seq(
diff --git a/dhall/src/phase/normalize.rs b/dhall/src/phase/normalize.rs
index 3f6e99c..0992f74 100644
--- a/dhall/src/phase/normalize.rs
+++ b/dhall/src/phase/normalize.rs
@@ -290,7 +290,7 @@ pub(crate) fn apply_builtin(
)
}
},
- (ListFold, [_, l, _, cons, nil, r..]) => match &*l.as_whnf() {
+ (ListFold, [_, l, _, cons, nil, r @ ..]) => match &*l.as_whnf() {
EmptyListLit(_) => Ret::ValueWithRemainingArgs(r, nil.clone()),
NEListLit(xs) => {
let mut v = nil.clone();
@@ -326,7 +326,8 @@ pub(crate) fn apply_builtin(
)
}
},
- (OptionalFold, [_, v, _, just, nothing, r..]) => match &*v.as_whnf() {
+ (OptionalFold, [_, v, _, just, nothing, r @ ..]) => match &*v.as_whnf()
+ {
EmptyOptionalLit(_) => {
Ret::ValueWithRemainingArgs(r, nothing.clone())
}
@@ -356,7 +357,7 @@ pub(crate) fn apply_builtin(
),
),
},
- (NaturalFold, [n, t, succ, zero, r..]) => match &*n.as_whnf() {
+ (NaturalFold, [n, t, succ, zero, r @ ..]) => match &*n.as_whnf() {
NaturalLit(0) => Ret::ValueWithRemainingArgs(r, zero.clone()),
NaturalLit(n) => {
let fold = Value::from_builtin(NaturalFold)
diff --git a/dhall/src/phase/resolve.rs b/dhall/src/phase/resolve.rs
index 5bde68a..b10a7bd 100644
--- a/dhall/src/phase/resolve.rs
+++ b/dhall/src/phase/resolve.rs
@@ -16,7 +16,6 @@ type ImportCache = HashMap<Import, Normalized>;
pub(crate) type ImportStack = Vec<Import>;
-
fn resolve_import(
import: &Import,
root: &ImportRoot,
diff --git a/dhall/src/phase/typecheck.rs b/dhall/src/phase/typecheck.rs
index 9013c1f..2e61fbc 100644
--- a/dhall/src/phase/typecheck.rs
+++ b/dhall/src/phase/typecheck.rs
@@ -249,9 +249,7 @@ fn type_of_builtin<E>(b: Builtin) -> Expr<E> {
list
),
ListLength => make_type!(forall (a: Type) -> (List a) -> Natural),
- ListHead | ListLast => {
- make_type!(forall (a: Type) -> (List a) -> Optional a)
- }
+ ListHead | ListLast => make_type!(forall (a: Type) -> (List a) -> Optional a),
ListIndexed => make_type!(
forall (a: Type) ->
(List a) ->
@@ -375,9 +373,7 @@ fn type_last_layer(
Import(_) => unreachable!(
"There should remain no imports in a resolved expression"
),
- Lam(_, _, _) | Pi(_, _, _) | Let(_, _, _, _) | Embed(_) | Var(_) => {
- unreachable!()
- }
+ Lam(_, _, _) | Pi(_, _, _) | Let(_, _, _, _) | Embed(_) | Var(_) => unreachable!(),
App(f, a) => {
let tf = f.get_type()?;
let tf_borrow = tf.as_whnf();
diff --git a/dhall_proc_macros/Cargo.toml b/dhall_proc_macros/Cargo.toml
index df1eda8..b641a39 100644
--- a/dhall_proc_macros/Cargo.toml
+++ b/dhall_proc_macros/Cargo.toml
@@ -11,6 +11,6 @@ doctest = false
[dependencies]
itertools = "0.8.0"
-quote = "0.6.11"
-proc-macro2 = "0.4.27"
-syn = "0.15.29"
+quote = "1.0.2"
+proc-macro2 = "1.0.2"
+syn = { version = "1.0.5", features = ["full", "extra-traits"] }
diff --git a/dhall_proc_macros/src/lib.rs b/dhall_proc_macros/src/lib.rs
index 5304429..37e8f9f 100644
--- a/dhall_proc_macros/src/lib.rs
+++ b/dhall_proc_macros/src/lib.rs
@@ -1,3 +1,4 @@
+#![feature(drain_filter)]
//! This crate contains the code-generation primitives for the [dhall-rust][dhall-rust] crate.
//! This is highly unstable and breaks regularly; use at your own risk.
//!
@@ -6,6 +7,8 @@
extern crate proc_macro;
mod derive;
+mod make_parser;
+mod parse_children;
use proc_macro::TokenStream;
@@ -13,3 +16,19 @@ use proc_macro::TokenStream;
pub fn derive_static_type(input: TokenStream) -> TokenStream {
derive::derive_static_type(input)
}
+
+#[proc_macro_attribute]
+pub fn make_parser(attrs: TokenStream, input: TokenStream) -> TokenStream {
+ TokenStream::from(match make_parser::make_parser(attrs, input) {
+ Ok(tokens) => tokens,
+ Err(err) => err.to_compile_error(),
+ })
+}
+
+#[proc_macro]
+pub fn parse_children(input: TokenStream) -> TokenStream {
+ TokenStream::from(match parse_children::parse_children(input) {
+ Ok(tokens) => tokens,
+ Err(err) => err.to_compile_error(),
+ })
+}
diff --git a/dhall_proc_macros/src/make_parser.rs b/dhall_proc_macros/src/make_parser.rs
new file mode 100644
index 0000000..268a639
--- /dev/null
+++ b/dhall_proc_macros/src/make_parser.rs
@@ -0,0 +1,111 @@
+use quote::quote;
+use syn::parse::{ParseStream, Result};
+use syn::spanned::Spanned;
+use syn::{
+ parse_quote, Error, Expr, FnArg, Ident, ImplItem, ImplItemMethod, ItemImpl,
+ Pat, Token,
+};
+
+fn apply_special_attrs(function: &mut ImplItemMethod) -> Result<()> {
+ *function = parse_quote!(
+ #[allow(non_snake_case, dead_code)]
+ #function
+ );
+
+ let recognized_attrs: Vec<_> = function
+ .attrs
+ .drain_filter(|attr| attr.path.is_ident("prec_climb"))
+ .collect();
+
+ let name = function.sig.ident.clone();
+
+ if recognized_attrs.is_empty() {
+ // do nothing
+ } else if recognized_attrs.len() > 1 {
+ return Err(Error::new(
+ recognized_attrs[1].span(),
+ "expected a single prec_climb attribute",
+ ));
+ } else {
+ let attr = recognized_attrs.into_iter().next().unwrap();
+ let (child_rule, climber) =
+ attr.parse_args_with(|input: ParseStream| {
+ let child_rule: Ident = input.parse()?;
+ let _: Token![,] = input.parse()?;
+ let climber: Expr = input.parse()?;
+ Ok((child_rule, climber))
+ })?;
+
+ // Get the name of the first (`input`) function argument
+ let first_arg = function.sig.inputs.first().ok_or_else(|| {
+ Error::new(
+ function.sig.inputs.span(),
+ "a prec_climb function needs 4 arguments",
+ )
+ })?;
+ let first_arg = match &first_arg {
+ FnArg::Receiver(_) => return Err(Error::new(
+ first_arg.span(),
+ "a prec_climb function should not have a `self` argument",
+ )),
+ FnArg::Typed(first_arg) => match &*first_arg.pat{
+ Pat::Ident(ident) => &ident.ident,
+ _ => return Err(Error::new(
+ first_arg.span(),
+ "this argument should be a plain identifier instead of a pattern",
+ )),
+ }
+ };
+
+ function.block = parse_quote!({
+ #function
+
+ #climber.climb(
+ #first_arg.pair.clone().into_inner(),
+ |p| Self::#child_rule(#first_arg.with_pair(p)),
+ |l, op, r| {
+ #name(#first_arg.clone(), l?, op, r?)
+ },
+ )
+ });
+ // Remove the 3 last arguments to keep only the `input` one
+ function.sig.inputs.pop();
+ function.sig.inputs.pop();
+ function.sig.inputs.pop();
+ // Check that an argument remains
+ function.sig.inputs.first().ok_or_else(|| {
+ Error::new(
+ function.sig.inputs.span(),
+ "a prec_climb function needs 4 arguments",
+ )
+ })?;
+ }
+
+ Ok(())
+}
+
+pub fn make_parser(
+ attrs: proc_macro::TokenStream,
+ input: proc_macro::TokenStream,
+) -> Result<proc_macro2::TokenStream> {
+ let rule_enum: Ident = syn::parse(attrs)?;
+
+ let mut imp: ItemImpl = syn::parse(input)?;
+ imp.items
+ .iter_mut()
+ .map(|item| match item {
+ ImplItem::Method(m) => apply_special_attrs(m),
+ _ => Ok(()),
+ })
+ .collect::<Result<()>>()?;
+
+ let ty = &imp.self_ty;
+ let (impl_generics, _, where_clause) = imp.generics.split_for_impl();
+ Ok(quote!(
+ impl #impl_generics PestConsumer for #ty #where_clause {
+ type RuleEnum = #rule_enum;
+ }
+
+ #imp
+ ))
+}
diff --git a/dhall_proc_macros/src/parse_children.rs b/dhall_proc_macros/src/parse_children.rs
new file mode 100644
index 0000000..b1d43fc
--- /dev/null
+++ b/dhall_proc_macros/src/parse_children.rs
@@ -0,0 +1,212 @@
+use proc_macro2::{Span, TokenStream};
+use quote::quote;
+use syn::parse::{Parse, ParseStream, Result};
+use syn::punctuated::Punctuated;
+use syn::spanned::Spanned;
+use syn::{bracketed, parenthesized, token, Error, Expr, Ident, Pat, Token};
+
+#[derive(Debug, Clone)]
+struct ChildrenBranch {
+ pattern_span: Span,
+ pattern: Punctuated<ChildrenBranchPatternItem, Token![,]>,
+ body: Expr,
+}
+
+#[derive(Debug, Clone)]
+enum ChildrenBranchPatternItem {
+ Single { rule_name: Ident, binder: Pat },
+ Multiple { rule_name: Ident, binder: Ident },
+}
+
+#[derive(Debug, Clone)]
+struct ParseChildrenInput {
+ input_expr: Expr,
+ branches: Punctuated<ChildrenBranch, Token![,]>,
+}
+
+impl Parse for ChildrenBranch {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let contents;
+ let _: token::Bracket = bracketed!(contents in input);
+ let pattern_unparsed: TokenStream = contents.fork().parse()?;
+ let pattern_span = pattern_unparsed.span();
+ let pattern = Punctuated::parse_terminated(&contents)?;
+ let _: Token![=>] = input.parse()?;
+ let body = input.parse()?;
+
+ Ok(ChildrenBranch {
+ pattern_span,
+ pattern,
+ body,
+ })
+ }
+}
+
+impl Parse for ChildrenBranchPatternItem {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let contents;
+ let rule_name = input.parse()?;
+ parenthesized!(contents in input);
+ if input.peek(Token![..]) {
+ let binder = contents.parse()?;
+ let _: Token![..] = input.parse()?;
+ Ok(ChildrenBranchPatternItem::Multiple { rule_name, binder })
+ } else if input.is_empty() || input.peek(Token![,]) {
+ let binder = contents.parse()?;
+ Ok(ChildrenBranchPatternItem::Single { rule_name, binder })
+ } else {
+ Err(input.error("expected `..` or nothing"))
+ }
+ }
+}
+
+impl Parse for ParseChildrenInput {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let input_expr = input.parse()?;
+ let _: Token![;] = input.parse()?;
+ let branches = Punctuated::parse_terminated(input)?;
+
+ Ok(ParseChildrenInput {
+ input_expr,
+ branches,
+ })
+ }
+}
+
+fn make_parser_branch(
+ branch: &ChildrenBranch,
+ i_inputs: &Ident,
+) -> Result<TokenStream> {
+ use ChildrenBranchPatternItem::{Multiple, Single};
+
+ let body = &branch.body;
+
+ // Convert the input pattern into a pattern-match on the Rules of the children. This uses
+ // slice_patterns.
+ // A single pattern just checks that the rule matches; a variable-length pattern binds the
+ // subslice and checks, in the if-guard, that its elements all match the chosen Rule.
+ let i_variable_pattern =
+ Ident::new("___variable_pattern", Span::call_site());
+ let match_pat = branch.pattern.iter().map(|item| match item {
+ Single { rule_name, .. } => {
+ quote!(<<Self as PestConsumer>::RuleEnum>::#rule_name)
+ }
+ Multiple { .. } => quote!(#i_variable_pattern @ ..),
+ });
+ let match_filter = branch.pattern.iter().map(|item| match item {
+ Single { .. } => quote!(),
+ Multiple { rule_name, .. } => quote!(
+ {
+ // We can't use .all() directly in the pattern guard; see
+ // https://github.com/rust-lang/rust/issues/59803.
+ let all_match = |slice: &[_]| {
+ slice.iter().all(|r|
+ r == &<<Self as PestConsumer>::RuleEnum>::#rule_name
+ )
+ };
+ all_match(#i_variable_pattern)
+ } &&
+ ),
+ });
+
+ // Once we have found a branch that matches, we need to parse the children.
+ let mut singles_before_multiple = Vec::new();
+ let mut multiple = None;
+ let mut singles_after_multiple = Vec::new();
+ for item in &branch.pattern {
+ match item {
+ Single {
+ rule_name, binder, ..
+ } => {
+ if multiple.is_none() {
+ singles_before_multiple.push((rule_name, binder))
+ } else {
+ singles_after_multiple.push((rule_name, binder))
+ }
+ }
+ Multiple {
+ rule_name, binder, ..
+ } => {
+ if multiple.is_none() {
+ multiple = Some((rule_name, binder))
+ } else {
+ return Err(Error::new(
+ branch.pattern_span.clone(),
+ "multiple variable-length patterns are not allowed",
+ ));
+ }
+ }
+ }
+ }
+ let mut parses = Vec::new();
+ for (rule_name, binder) in singles_before_multiple.into_iter() {
+ parses.push(quote!(
+ let #binder = Self::#rule_name(
+ #i_inputs.next().unwrap()
+ )?;
+ ))
+ }
+ // Note the `rev()`: we are taking inputs from the end of the iterator in reverse order, so that
+ // only the unmatched inputs are left for the variable-length pattern, if any.
+ for (rule_name, binder) in singles_after_multiple.into_iter().rev() {
+ parses.push(quote!(
+ let #binder = Self::#rule_name(
+ #i_inputs.next_back().unwrap()
+ )?;
+ ))
+ }
+ if let Some((rule_name, binder)) = multiple {
+ parses.push(quote!(
+ let #binder = #i_inputs
+ .map(|i| Self::#rule_name(i))
+ .collect::<Result<Vec<_>, _>>()?
+ .into_iter();
+ ))
+ }
+
+ Ok(quote!(
+ [#(#match_pat),*] if #(#match_filter)* true => {
+ #(#parses)*
+ #body
+ }
+ ))
+}
+
+pub fn parse_children(
+ input: proc_macro::TokenStream,
+) -> Result<proc_macro2::TokenStream> {
+ let input: ParseChildrenInput = syn::parse(input)?;
+
+ let i_children_rules = Ident::new("___children_rules", Span::call_site());
+ let i_inputs = Ident::new("___inputs", Span::call_site());
+
+ let input_expr = &input.input_expr;
+ let branches = input
+ .branches
+ .iter()
+ .map(|br| make_parser_branch(br, &i_inputs))
+ .collect::<Result<Vec<_>>>()?;
+
+ Ok(quote!({
+ let #i_children_rules: Vec<_> = #input_expr.pair
+ .clone()
+ .into_inner()
+ .map(|p| p.as_rule())
+ .collect();
+
+ #[allow(unused_mut)]
+ let mut #i_inputs = #input_expr
+ .pair
+ .clone()
+ .into_inner()
+ .map(|p| #input_expr.with_pair(p));
+
+ #[allow(unreachable_code)]
+ match #i_children_rules.as_slice() {
+ #(#branches,)*
+ [..] => return Err(#input_expr.error(
+ format!("Unexpected children: {:?}", #i_children_rules)
+ )),
+ }
+ }))
+}
diff --git a/dhall_syntax/Cargo.toml b/dhall_syntax/Cargo.toml
index 1da10c7..eb492d0 100644
--- a/dhall_syntax/Cargo.toml
+++ b/dhall_syntax/Cargo.toml
@@ -15,4 +15,6 @@ pest = "2.1"
either = "1.5.2"
take_mut = "0.2.2"
hex = "0.3.2"
+lazy_static = "1.4.0"
dhall_generated_parser = { path = "../dhall_generated_parser" }
+dhall_proc_macros = { path = "../dhall_proc_macros" }
diff --git a/dhall_syntax/src/core/expr.rs b/dhall_syntax/src/core/expr.rs
index 51b6c47..eeee4d8 100644
--- a/dhall_syntax/src/core/expr.rs
+++ b/dhall_syntax/src/core/expr.rs
@@ -381,15 +381,10 @@ pub fn rc<E>(x: RawExpr<E>) -> Expr<E> {
Expr::from_expr_no_span(x)
}
-pub(crate) fn spanned(
- span: Span,
- x: crate::parser::ParsedRawExpr,
-) -> crate::parser::ParsedExpr {
+pub(crate) fn spanned<E>(span: Span, x: RawExpr<E>) -> Expr<E> {
Expr::new(x, span)
}
-pub(crate) fn unspanned(
- x: crate::parser::ParsedRawExpr,
-) -> crate::parser::ParsedExpr {
+pub(crate) fn unspanned<E>(x: RawExpr<E>) -> Expr<E> {
Expr::from_expr_no_span(x)
}
diff --git a/dhall_syntax/src/lib.rs b/dhall_syntax/src/lib.rs
index e4a6077..95f40c2 100644
--- a/dhall_syntax/src/lib.rs
+++ b/dhall_syntax/src/lib.rs
@@ -1,8 +1,7 @@
#![feature(trace_macros)]
#![feature(slice_patterns)]
-#![feature(try_blocks)]
#![feature(never_type)]
-#![feature(bind_by_move_pattern_guards)]
+#![feature(proc_macro_hygiene)]
#![allow(
clippy::many_single_char_names,
clippy::should_implement_trait,
diff --git a/dhall_syntax/src/parser.rs b/dhall_syntax/src/parser.rs
index b70a236..40784ec 100644
--- a/dhall_syntax/src/parser.rs
+++ b/dhall_syntax/src/parser.rs
@@ -4,10 +4,10 @@ use pest::prec_climber as pcl;
use pest::prec_climber::PrecClimber;
use pest::Parser;
use std::borrow::Cow;
-use std::collections::HashMap;
use std::rc::Rc;
use dhall_generated_parser::{DhallParser, Rule};
+use dhall_proc_macros::{make_parser, parse_children};
use crate::map::{DupTreeMap, DupTreeSet};
use crate::ExprF::*;
@@ -18,64 +18,59 @@ use crate::*;
// their own crate because they are quite general and useful. For now they
// are here and hopefully you can figure out how they work.
-pub(crate) type ParsedRawExpr = RawExpr<!>;
-pub(crate) type ParsedExpr = Expr<!>;
-type ParsedText = InterpolatedText<ParsedExpr>;
-type ParsedTextContents = InterpolatedTextContents<ParsedExpr>;
+type ParsedText<E> = InterpolatedText<Expr<E>>;
+type ParsedTextContents<E> = InterpolatedTextContents<Expr<E>>;
pub type ParseError = pest::error::Error<Rule>;
pub type ParseResult<T> = Result<T, ParseError>;
-#[derive(Debug)]
-enum Either<A, B> {
- Left(A),
- Right(B),
+#[derive(Debug, Clone)]
+struct ParseInput<'input, Rule>
+where
+ Rule: pest::RuleType,
+{
+ pair: Pair<'input, Rule>,
+ original_input_str: Rc<str>,
}
-impl crate::Builtin {
- pub fn parse(s: &str) -> Option<Self> {
- use crate::Builtin::*;
- match s {
- "Bool" => Some(Bool),
- "Natural" => Some(Natural),
- "Integer" => Some(Integer),
- "Double" => Some(Double),
- "Text" => Some(Text),
- "List" => Some(List),
- "Optional" => Some(Optional),
- "None" => Some(OptionalNone),
- "Natural/build" => Some(NaturalBuild),
- "Natural/fold" => Some(NaturalFold),
- "Natural/isZero" => Some(NaturalIsZero),
- "Natural/even" => Some(NaturalEven),
- "Natural/odd" => Some(NaturalOdd),
- "Natural/toInteger" => Some(NaturalToInteger),
- "Natural/show" => Some(NaturalShow),
- "Natural/subtract" => Some(NaturalSubtract),
- "Integer/toDouble" => Some(IntegerToDouble),
- "Integer/show" => Some(IntegerShow),
- "Double/show" => Some(DoubleShow),
- "List/build" => Some(ListBuild),
- "List/fold" => Some(ListFold),
- "List/length" => Some(ListLength),
- "List/head" => Some(ListHead),
- "List/last" => Some(ListLast),
- "List/indexed" => Some(ListIndexed),
- "List/reverse" => Some(ListReverse),
- "Optional/fold" => Some(OptionalFold),
- "Optional/build" => Some(OptionalBuild),
- "Text/show" => Some(TextShow),
- _ => None,
+impl<'input> ParseInput<'input, Rule> {
+ fn error(&self, message: String) -> ParseError {
+ let message = format!(
+ "{} while matching on:\n{}",
+ message,
+ debug_pair(self.pair.clone())
+ );
+ let e = pest::error::ErrorVariant::CustomError { message };
+ pest::error::Error::new_from_span(e, self.pair.as_span())
+ }
+ fn parse(input_str: &'input str, rule: Rule) -> ParseResult<Self> {
+ let mut pairs = DhallParser::parse(rule, input_str)?;
+ // TODO: proper errors
+ let pair = pairs.next().unwrap();
+ assert_eq!(pairs.next(), None);
+ Ok(ParseInput {
+ original_input_str: input_str.to_string().into(),
+ pair,
+ })
+ }
+ fn with_pair(&self, new_pair: Pair<'input, Rule>) -> Self {
+ ParseInput {
+ pair: new_pair,
+ original_input_str: self.original_input_str.clone(),
}
}
+ fn as_span(&self) -> Span {
+ Span::make(self.original_input_str.clone(), self.pair.as_span())
+ }
+ fn as_str(&self) -> &'input str {
+ self.pair.as_str()
+ }
}
-pub fn custom_parse_error(pair: &Pair<Rule>, msg: String) -> ParseError {
- let msg =
- format!("{} while matching on:\n{}", msg, debug_pair(pair.clone()));
- let e = pest::error::ErrorVariant::CustomError { message: msg };
- pest::error::Error::new_from_span(e, pair.as_span())
+// Used to retrieve the `Rule` enum associated with the `Self` type in `parse_children`.
+trait PestConsumer {
+ type RuleEnum: pest::RuleType;
}
fn debug_pair(pair: Pair<Rule>) -> String {
@@ -119,276 +114,53 @@ fn debug_pair(pair: Pair<Rule>) -> String {
s
}
-macro_rules! parse_children {
- // Variable length pattern with a common unary variant
- (@match_forwards,
- $parse_args:expr,
- $iter:expr,
- ($body:expr),
- $variant:ident ($x:ident)..,
- $($rest:tt)*
- ) => {
- parse_children!(@match_backwards,
- $parse_args, $iter,
- ({
- let $x = $iter
- .map(|x| Parsers::$variant($parse_args, x))
- .collect::<Result<Vec<_>, _>>()?
- .into_iter();
- $body
- }),
- $($rest)*
- )
- };
- // Single item pattern
- (@match_forwards,
- $parse_args:expr,
- $iter:expr,
- ($body:expr),
- $variant:ident ($x:pat),
- $($rest:tt)*
- ) => {{
- let p = $iter.next().unwrap();
- let $x = Parsers::$variant($parse_args, p)?;
- parse_children!(@match_forwards,
- $parse_args, $iter,
- ($body),
- $($rest)*
- )
- }};
- // Single item pattern after a variable length one: declare reversed and take from the end
- (@match_backwards,
- $parse_args:expr,
- $iter:expr,
- ($body:expr),
- $variant:ident ($x:pat),
- $($rest:tt)*
- ) => {
- parse_children!(@match_backwards, $parse_args, $iter, ({
- let p = $iter.next_back().unwrap();
- let $x = Parsers::$variant($parse_args, p)?;
- $body
- }), $($rest)*)
- };
-
- // Check no elements remain
- (@match_forwards, $parse_args:expr, $iter:expr, ($body:expr) $(,)*) => {
- $body
- };
- // After a variable length pattern, everything has already been consumed
- (@match_backwards, $parse_args:expr, $iter:expr, ($body:expr) $(,)*) => {
- $body
- };
-
- ($parse_args:expr, $iter:expr; [$($args:tt)*] => $body:expr) => {
- parse_children!(@match_forwards,
- $parse_args, $iter,
- ($body),
- $($args)*,
- )
- };
+#[derive(Debug)]
+enum Either<A, B> {
+ Left(A),
+ Right(B),
}
-macro_rules! make_parser {
- (@children_pattern,
- $varpat:ident,
- ($($acc:tt)*),
- [$variant:ident ($x:pat), $($rest:tt)*]
- ) => (
- make_parser!(@children_pattern,
- $varpat,
- ($($acc)* , Rule::$variant),
- [$($rest)*]
- )
- );
- (@children_pattern,
- $varpat:ident,
- ($($acc:tt)*),
- [$variant:ident ($x:ident).., $($rest:tt)*]
- ) => (
- make_parser!(@children_pattern,
- $varpat,
- ($($acc)* , $varpat..),
- [$($rest)*]
- )
- );
- (@children_pattern,
- $varpat:ident,
- (, $($acc:tt)*), [$(,)*]
- ) => ([$($acc)*]);
- (@children_pattern,
- $varpat:ident,
- ($($acc:tt)*), [$(,)*]
- ) => ([$($acc)*]);
-
- (@children_filter,
- $varpat:ident,
- [$variant:ident ($x:pat), $($rest:tt)*]
- ) => (
- make_parser!(@children_filter, $varpat, [$($rest)*])
- );
- (@children_filter,
- $varpat:ident,
- [$variant:ident ($x:ident).., $($rest:tt)*]
- ) => (
- $varpat.iter().all(|r| r == &Rule::$variant) &&
- make_parser!(@children_filter, $varpat, [$($rest)*])
- );
- (@children_filter, $varpat:ident, [$(,)*]) => (true);
-
- (@body,
- ($climbers:expr, $input:expr, $pair:expr),
- rule!(
- $name:ident<$o:ty>;
- $span:ident;
- captured_str!($x:pat) => $body:expr
- )
- ) => ({
- let $span = Span::make($input.clone(), $pair.as_span());
- let $x = $pair.as_str();
- let res: Result<_, String> = try { $body };
- res.map_err(|msg| custom_parse_error(&$pair, msg))
- });
- (@body,
- ($climbers:expr, $input:expr, $pair:expr),
- rule!(
- $name:ident<$o:ty>;
- $span:ident;
- children!( $( [$($args:tt)*] => $body:expr ),* $(,)* )
- )
- ) => ({
- let children_rules: Vec<Rule> = $pair
- .clone()
- .into_inner()
- .map(|p| p.as_rule())
- .collect();
-
- let $span = Span::make($input.clone(), $pair.as_span());
- #[allow(unused_mut)]
- let mut iter = $pair.clone().into_inner();
-
- #[allow(unreachable_code)]
- match children_rules.as_slice() {
- $(
- make_parser!(@children_pattern, x, (), [$($args)*,])
- if make_parser!(@children_filter, x, [$($args)*,])
- => {
- parse_children!(($climbers, $input.clone()), iter;
- [$($args)*] => {
- let res: Result<_, String> = try { $body };
- res.map_err(|msg| custom_parse_error(&$pair, msg))
- }
- )
- }
- ,
- )*
- [..] => Err(custom_parse_error(
- &$pair,
- format!("Unexpected children: {:?}", children_rules)
- )),
- }
- });
- (@body,
- ($climbers:expr, $input:expr, $pair:expr),
- rule!(
- $name:ident<$o:ty>;
- prec_climb!(
- $other_rule:ident,
- $_climber:expr,
- $args:pat => $body:expr $(,)*
- )
- )
- ) => ({
- let climber = $climbers.get(&Rule::$name).unwrap();
- climber.climb(
- $pair.clone().into_inner(),
- |p| Parsers::$other_rule(($climbers, $input.clone()), p),
- |l, op, r| {
- let $args = (l?, op, r?);
- let res: Result<_, String> = try { $body };
- res.map_err(|msg| custom_parse_error(&$pair, msg))
- },
- )
- });
- (@body,
- ($($things:tt)*),
- rule!(
- $name:ident<$o:ty>;
- $($args:tt)*
- )
- ) => ({
- make_parser!(@body,
- ($($things)*),
- rule!(
- $name<$o>;
- _span;
- $($args)*
- )
- )
- });
- (@body,
- ($($things:tt)*),
- rule!($name:ident<$o:ty>)
- ) => ({
- Ok(())
- });
-
- (@construct_climber,
- ($map:expr),
- rule!(
- $name:ident<$o:ty>;
- prec_climb!($other_rule:ident, $climber:expr, $($_rest:tt)* )
- )
- ) => ({
- $map.insert(Rule::$name, $climber)
- });
- (@construct_climber, ($($things:tt)*), $($args:tt)*) => (());
-
- ($( $submac:ident!( $name:ident<$o:ty> $($args:tt)* ); )*) => (
- struct Parsers;
-
- impl Parsers {
- $(
- #[allow(non_snake_case, unused_variables, clippy::let_unit_value)]
- fn $name<'a>(
- (climbers, input): (&HashMap<Rule, PrecClimber<Rule>>, Rc<str>),
- pair: Pair<'a, Rule>,
- ) -> ParseResult<$o> {
- make_parser!(@body, (climbers, input, pair),
- $submac!( $name<$o> $($args)* ))
- }
- )*
- }
-
- fn construct_precclimbers() -> HashMap<Rule, PrecClimber<Rule>> {
- let mut map = HashMap::new();
- $(
- make_parser!(@construct_climber, (map),
- $submac!( $name<$o> $($args)* ));
- )*
- map
- }
-
- struct EntryPoint;
-
- impl EntryPoint {
- $(
- #[allow(non_snake_case, dead_code)]
- fn $name<'a>(
- input: Rc<str>,
- pair: Pair<'a, Rule>,
- ) -> ParseResult<$o> {
- let climbers = construct_precclimbers();
- Parsers::$name((&climbers, input), pair)
- }
- )*
+impl crate::Builtin {
+ pub fn parse(s: &str) -> Option<Self> {
+ use crate::Builtin::*;
+ match s {
+ "Bool" => Some(Bool),
+ "Natural" => Some(Natural),
+ "Integer" => Some(Integer),
+ "Double" => Some(Double),
+ "Text" => Some(Text),
+ "List" => Some(List),
+ "Optional" => Some(Optional),
+ "None" => Some(OptionalNone),
+ "Natural/build" => Some(NaturalBuild),
+ "Natural/fold" => Some(NaturalFold),
+ "Natural/isZero" => Some(NaturalIsZero),
+ "Natural/even" => Some(NaturalEven),
+ "Natural/odd" => Some(NaturalOdd),
+ "Natural/toInteger" => Some(NaturalToInteger),
+ "Natural/show" => Some(NaturalShow),
+ "Natural/subtract" => Some(NaturalSubtract),
+ "Integer/toDouble" => Some(IntegerToDouble),
+ "Integer/show" => Some(IntegerShow),
+ "Double/show" => Some(DoubleShow),
+ "List/build" => Some(ListBuild),
+ "List/fold" => Some(ListFold),
+ "List/length" => Some(ListLength),
+ "List/head" => Some(ListHead),
+ "List/last" => Some(ListLast),
+ "List/indexed" => Some(ListIndexed),
+ "List/reverse" => Some(ListReverse),
+ "Optional/fold" => Some(OptionalFold),
+ "Optional/build" => Some(OptionalBuild),
+ "Text/show" => Some(TextShow),
+ _ => None,
}
- );
+ }
}
// Trim the shared indent off of a vec of lines, as defined by the Dhall semantics of multiline
// literals.
-fn trim_indent(lines: &mut Vec<ParsedText>) {
+fn trim_indent<E: Clone>(lines: &mut Vec<ParsedText<E>>) {
let is_indent = |c: char| c == ' ' || c == '\t';
// There is at least one line so this is safe
@@ -427,676 +199,901 @@ fn trim_indent(lines: &mut Vec<ParsedText>) {
}
}
-make_parser! {
- rule!(EOI<()>);
-
- rule!(simple_label<Label>;
- captured_str!(s) => Label::from(s.trim().to_owned())
- );
- rule!(quoted_label<Label>;
- captured_str!(s) => Label::from(s.trim().to_owned())
- );
- rule!(label<Label>; children!(
- [simple_label(l)] => l,
- [quoted_label(l)] => l,
- ));
-
- rule!(double_quote_literal<ParsedText>; children!(
- [double_quote_chunk(chunks)..] => {
- chunks.collect()
- }
- ));
-
- rule!(double_quote_chunk<ParsedTextContents>; children!(
- [interpolation(e)] => {
- InterpolatedTextContents::Expr(e)
- },
- [double_quote_escaped(s)] => {
- InterpolatedTextContents::Text(s)
- },
- [double_quote_char(s)] => {
- InterpolatedTextContents::Text(s.to_owned())
- },
- ));
- rule!(double_quote_escaped<String>;
- captured_str!(s) => {
- match s {
- "\"" => "\"".to_owned(),
- "$" => "$".to_owned(),
- "\\" => "\\".to_owned(),
- "/" => "/".to_owned(),
- "b" => "\u{0008}".to_owned(),
- "f" => "\u{000C}".to_owned(),
- "n" => "\n".to_owned(),
- "r" => "\r".to_owned(),
- "t" => "\t".to_owned(),
- // "uXXXX" or "u{XXXXX}"
- _ => {
- use std::convert::{TryFrom, TryInto};
-
- let s = &s[1..];
- let s = if &s[0..1] == "{" {
- &s[1..s.len()-1]
- } else {
- &s[0..s.len()]
- };
-
- if s.len() > 8 {
- Err(format!("Escape sequences can't have more than 8 chars: \"{}\"", s))?
- }
+lazy_static::lazy_static! {
+ static ref PRECCLIMBER: PrecClimber<Rule> = {
+ use Rule::*;
+ // In order of precedence
+ let operators = vec![
+ import_alt,
+ bool_or,
+ natural_plus,
+ text_append,
+ list_append,
+ bool_and,
+ combine,
+ prefer,
+ combine_types,
+ natural_times,
+ bool_eq,
+ bool_ne,
+ equivalent,
+ ];
+ PrecClimber::new(
+ operators
+ .into_iter()
+ .map(|op| pcl::Operator::new(op, pcl::Assoc::Left))
+ .collect(),
+ )
+ };
+}
+
+struct Parsers;
+
+#[make_parser(Rule)]
+impl Parsers {
+ fn EOI(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+
+ fn simple_label(input: ParseInput<Rule>) -> ParseResult<Label> {
+ Ok(Label::from(input.as_str().trim().to_owned()))
+ }
+ fn quoted_label(input: ParseInput<Rule>) -> ParseResult<Label> {
+ Ok(Label::from(input.as_str().trim().to_owned()))
+ }
+ fn label(input: ParseInput<Rule>) -> ParseResult<Label> {
+ Ok(parse_children!(input;
+ [simple_label(l)] => l,
+ [quoted_label(l)] => l,
+ ))
+ }
- // pad with zeroes
- let s: String = std::iter::repeat('0')
- .take(8 - s.len())
- .chain(s.chars())
- .collect();
-
- // `s` has length 8, so `bytes` has length 4
- let bytes: &[u8] = &hex::decode(s).unwrap();
- let i = u32::from_be_bytes(bytes.try_into().unwrap());
- let c = char::try_from(i).unwrap();
- match i {
- 0xD800..=0xDFFF => {
- let c_ecapsed = c.escape_unicode();
- Err(format!("Escape sequences can't contain surrogate pairs: \"{}\"", c_ecapsed))?
- },
- 0x0FFFE..=0x0FFFF | 0x1FFFE..=0x1FFFF |
- 0x2FFFE..=0x2FFFF | 0x3FFFE..=0x3FFFF |
- 0x4FFFE..=0x4FFFF | 0x5FFFE..=0x5FFFF |
- 0x6FFFE..=0x6FFFF | 0x7FFFE..=0x7FFFF |
- 0x8FFFE..=0x8FFFF | 0x9FFFE..=0x9FFFF |
- 0xAFFFE..=0xAFFFF | 0xBFFFE..=0xBFFFF |
- 0xCFFFE..=0xCFFFF | 0xDFFFE..=0xDFFFF |
- 0xEFFFE..=0xEFFFF | 0xFFFFE..=0xFFFFF |
- 0x10_FFFE..=0x10_FFFF => {
- let c_ecapsed = c.escape_unicode();
- Err(format!("Escape sequences can't contain non-characters: \"{}\"", c_ecapsed))?
- },
- _ => {}
+ fn double_quote_literal<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<ParsedText<E>> {
+ Ok(parse_children!(input;
+ [double_quote_chunk(chunks)..] => {
+ chunks.collect()
+ }
+ ))
+ }
+
+ fn double_quote_chunk<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<ParsedTextContents<E>> {
+ Ok(parse_children!(input;
+ [interpolation(e)] => {
+ InterpolatedTextContents::Expr(e)
+ },
+ [double_quote_escaped(s)] => {
+ InterpolatedTextContents::Text(s)
+ },
+ [double_quote_char(s)] => {
+ InterpolatedTextContents::Text(s.to_owned())
+ },
+ ))
+ }
+ fn double_quote_escaped(input: ParseInput<Rule>) -> ParseResult<String> {
+ Ok(match input.as_str() {
+ "\"" => "\"".to_owned(),
+ "$" => "$".to_owned(),
+ "\\" => "\\".to_owned(),
+ "/" => "/".to_owned(),
+ "b" => "\u{0008}".to_owned(),
+ "f" => "\u{000C}".to_owned(),
+ "n" => "\n".to_owned(),
+ "r" => "\r".to_owned(),
+ "t" => "\t".to_owned(),
+ // "uXXXX" or "u{XXXXX}"
+ s => {
+ use std::convert::{TryFrom, TryInto};
+
+ let s = &s[1..];
+ let s = if &s[0..1] == "{" {
+ &s[1..s.len() - 1]
+ } else {
+ &s[0..s.len()]
+ };
+
+ if s.len() > 8 {
+ Err(input.error(format!(
+ "Escape sequences can't have more than 8 chars: \"{}\"",
+ s
+ )))?
+ }
+
+ // pad with zeroes
+ let s: String = std::iter::repeat('0')
+ .take(8 - s.len())
+ .chain(s.chars())
+ .collect();
+
+ // `s` has length 8, so `bytes` has length 4
+ let bytes: &[u8] = &hex::decode(s).unwrap();
+ let i = u32::from_be_bytes(bytes.try_into().unwrap());
+ let c = char::try_from(i).unwrap();
+ match i {
+ 0xD800..=0xDFFF => {
+ let c_ecapsed = c.escape_unicode();
+ Err(input.error(format!("Escape sequences can't contain surrogate pairs: \"{}\"", c_ecapsed)))?
+ }
+ 0x0FFFE..=0x0FFFF
+ | 0x1FFFE..=0x1FFFF
+ | 0x2FFFE..=0x2FFFF
+ | 0x3FFFE..=0x3FFFF
+ | 0x4FFFE..=0x4FFFF
+ | 0x5FFFE..=0x5FFFF
+ | 0x6FFFE..=0x6FFFF
+ | 0x7FFFE..=0x7FFFF
+ | 0x8FFFE..=0x8FFFF
+ | 0x9FFFE..=0x9FFFF
+ | 0xAFFFE..=0xAFFFF
+ | 0xBFFFE..=0xBFFFF
+ | 0xCFFFE..=0xCFFFF
+ | 0xDFFFE..=0xDFFFF
+ | 0xEFFFE..=0xEFFFF
+ | 0xFFFFE..=0xFFFFF
+ | 0x10_FFFE..=0x10_FFFF => {
+ let c_ecapsed = c.escape_unicode();
+ Err(input.error(format!("Escape sequences can't contain non-characters: \"{}\"", c_ecapsed)))?
}
- std::iter::once(c).collect()
+ _ => {}
}
+ std::iter::once(c).collect()
}
- }
- );
- rule!(double_quote_char<&'a str>;
- captured_str!(s) => s
- );
+ })
+ }
+ fn double_quote_char<'a>(
+ input: ParseInput<'a, Rule>,
+ ) -> ParseResult<&'a str> {
+ Ok(input.as_str())
+ }
- rule!(single_quote_literal<ParsedText>; children!(
- [single_quote_continue(lines)] => {
- let newline: ParsedText = "\n".to_string().into();
+ fn single_quote_literal<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<ParsedText<E>> {
+ Ok(parse_children!(input;
+ [single_quote_continue(lines)] => {
+ let newline: ParsedText<E> = "\n".to_string().into();
- let mut lines: Vec<ParsedText> = lines
- .into_iter()
- .rev()
- .map(|l| l.into_iter().rev().collect::<ParsedText>())
- .collect();
+ let mut lines: Vec<ParsedText<E>> = lines
+ .into_iter()
+ .rev()
+ .map(|l| l.into_iter().rev().collect::<ParsedText<E>>())
+ .collect();
- trim_indent(&mut lines);
+ trim_indent(&mut lines);
- lines
- .into_iter()
- .intersperse(newline)
- .flat_map(InterpolatedText::into_iter)
- .collect::<ParsedText>()
- }
- ));
- rule!(single_quote_char<&'a str>;
- captured_str!(s) => s
- );
- rule!(escaped_quote_pair<&'a str>;
- captured_str!(_) => "''"
- );
- rule!(escaped_interpolation<&'a str>;
- captured_str!(_) => "${"
- );
- rule!(interpolation<ParsedExpr>; children!(
- [expression(e)] => e
- ));
+ lines
+ .into_iter()
+ .intersperse(newline)
+ .flat_map(InterpolatedText::into_iter)
+ .collect::<ParsedText<E>>()
+ }
+ ))
+ }
+ fn single_quote_char<'a>(
+ input: ParseInput<'a, Rule>,
+ ) -> ParseResult<&'a str> {
+ Ok(input.as_str())
+ }
+ fn escaped_quote_pair<'a>(_: ParseInput<'a, Rule>) -> ParseResult<&'a str> {
+ Ok("''")
+ }
+ fn escaped_interpolation<'a>(
+ _: ParseInput<'a, Rule>,
+ ) -> ParseResult<&'a str> {
+ Ok("${")
+ }
+ fn interpolation<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ Ok(parse_children!(input;
+ [expression(e)] => e
+ ))
+ }
// Returns a vec of lines in reversed order, where each line is also in reversed order.
- rule!(single_quote_continue<Vec<Vec<ParsedTextContents>>>; children!(
- [interpolation(c), single_quote_continue(lines)] => {
- let c = InterpolatedTextContents::Expr(c);
- let mut lines = lines;
- lines.last_mut().unwrap().push(c);
- lines
- },
- [escaped_quote_pair(c), single_quote_continue(lines)] => {
- let mut lines = lines;
- // TODO: don't allocate for every char
- let c = InterpolatedTextContents::Text(c.to_owned());
- lines.last_mut().unwrap().push(c);
- lines
- },
- [escaped_interpolation(c), single_quote_continue(lines)] => {
- let mut lines = lines;
- // TODO: don't allocate for every char
- let c = InterpolatedTextContents::Text(c.to_owned());
- lines.last_mut().unwrap().push(c);
- lines
- },
- [single_quote_char(c), single_quote_continue(lines)] => {
- let mut lines = lines;
- if c == "\n" || c == "\r\n" {
- lines.push(vec![]);
- } else {
+ fn single_quote_continue<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Vec<Vec<ParsedTextContents<E>>>> {
+ Ok(parse_children!(input;
+ [interpolation(c), single_quote_continue(lines)] => {
+ let c = InterpolatedTextContents::Expr(c);
+ let mut lines = lines;
+ lines.last_mut().unwrap().push(c);
+ lines
+ },
+ [escaped_quote_pair(c), single_quote_continue(lines)] => {
+ let mut lines = lines;
// TODO: don't allocate for every char
let c = InterpolatedTextContents::Text(c.to_owned());
lines.last_mut().unwrap().push(c);
- }
- lines
- },
- [] => {
- vec![vec![]]
- },
- ));
-
- rule!(builtin<ParsedExpr>; span;
- captured_str!(s) => {
- spanned(span, match crate::Builtin::parse(s) {
+ lines
+ },
+ [escaped_interpolation(c), single_quote_continue(lines)] => {
+ let mut lines = lines;
+ // TODO: don't allocate for every char
+ let c = InterpolatedTextContents::Text(c.to_owned());
+ lines.last_mut().unwrap().push(c);
+ lines
+ },
+ [single_quote_char(c), single_quote_continue(lines)] => {
+ let mut lines = lines;
+ if c == "\n" || c == "\r\n" {
+ lines.push(vec![]);
+ } else {
+ // TODO: don't allocate for every char
+ let c = InterpolatedTextContents::Text(c.to_owned());
+ lines.last_mut().unwrap().push(c);
+ }
+ lines
+ },
+ [] => {
+ vec![vec![]]
+ },
+ ))
+ }
+
+ fn builtin<E: Clone>(input: ParseInput<Rule>) -> ParseResult<Expr<E>> {
+ let s = input.as_str();
+ let span = input.as_span();
+ Ok(spanned(
+ span,
+ match crate::Builtin::parse(s) {
Some(b) => Builtin(b),
- None => match s {
- "True" => BoolLit(true),
- "False" => BoolLit(false),
- "Type" => Const(crate::Const::Type),
- "Kind" => Const(crate::Const::Kind),
- "Sort" => Const(crate::Const::Sort),
- _ => Err(
- format!("Unrecognized builtin: '{}'", s)
- )?,
+ None => {
+ match s {
+ "True" => BoolLit(true),
+ "False" => BoolLit(false),
+ "Type" => Const(crate::Const::Type),
+ "Kind" => Const(crate::Const::Kind),
+ "Sort" => Const(crate::Const::Sort),
+ _ => Err(input
+ .error(format!("Unrecognized builtin: '{}'", s)))?,
+ }
}
- })
+ },
+ ))
+ }
+
+ fn NaN(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn minus_infinity_literal(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn plus_infinity_literal(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+
+ fn numeric_double_literal(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<core::Double> {
+ let s = input.as_str().trim();
+ match s.parse::<f64>() {
+ Ok(x) if x.is_infinite() => Err(input.error(format!(
+ "Overflow while parsing double literal '{}'",
+ s
+ ))),
+ Ok(x) => Ok(NaiveDouble::from(x)),
+ Err(e) => Err(input.error(format!("{}", e))),
}
- );
-
- rule!(NaN<()>);
- rule!(minus_infinity_literal<()>);
- rule!(plus_infinity_literal<()>);
-
- rule!(numeric_double_literal<core::Double>;
- captured_str!(s) => {
- let s = s.trim();
- match s.parse::<f64>() {
- Ok(x) if x.is_infinite() =>
- Err(format!("Overflow while parsing double literal '{}'", s))?,
- Ok(x) => NaiveDouble::from(x),
- Err(e) => Err(format!("{}", e))?,
+ }
+
+ fn double_literal(input: ParseInput<Rule>) -> ParseResult<core::Double> {
+ Ok(parse_children!(input;
+ [numeric_double_literal(n)] => n,
+ [minus_infinity_literal(_)] => std::f64::NEG_INFINITY.into(),
+ [plus_infinity_literal(_)] => std::f64::INFINITY.into(),
+ [NaN(_)] => std::f64::NAN.into(),
+ ))
+ }
+
+ fn natural_literal(input: ParseInput<Rule>) -> ParseResult<core::Natural> {
+ input
+ .as_str()
+ .trim()
+ .parse()
+ .map_err(|e| input.error(format!("{}", e)))
+ }
+
+ fn integer_literal(input: ParseInput<Rule>) -> ParseResult<core::Integer> {
+ input
+ .as_str()
+ .trim()
+ .parse()
+ .map_err(|e| input.error(format!("{}", e)))
+ }
+
+ fn identifier<E: Clone>(input: ParseInput<Rule>) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [variable(v)] => {
+ spanned(span, Var(v))
+ },
+ [builtin(e)] => e,
+ ))
+ }
+
+ fn variable(input: ParseInput<Rule>) -> ParseResult<V<Label>> {
+ Ok(parse_children!(input;
+ [label(l), natural_literal(idx)] => {
+ V(l, idx)
+ },
+ [label(l)] => {
+ V(l, 0)
+ },
+ ))
+ }
+
+ fn unquoted_path_component<'a>(
+ input: ParseInput<'a, Rule>,
+ ) -> ParseResult<&'a str> {
+ Ok(input.as_str())
+ }
+ fn quoted_path_component<'a>(
+ input: ParseInput<'a, Rule>,
+ ) -> ParseResult<&'a str> {
+ Ok(input.as_str())
+ }
+ fn path_component(input: ParseInput<Rule>) -> ParseResult<String> {
+ Ok(parse_children!(input;
+ [unquoted_path_component(s)] => s.to_string(),
+ [quoted_path_component(s)] => {
+ const RESERVED: &percent_encoding::AsciiSet =
+ &percent_encoding::CONTROLS
+ .add(b'=').add(b':').add(b'/').add(b'?')
+ .add(b'#').add(b'[').add(b']').add(b'@')
+ .add(b'!').add(b'$').add(b'&').add(b'\'')
+ .add(b'(').add(b')').add(b'*').add(b'+')
+ .add(b',').add(b';');
+ s.chars()
+ .map(|c| {
+ // Percent-encode ascii chars
+ if c.is_ascii() {
+ percent_encoding::utf8_percent_encode(
+ &c.to_string(),
+ RESERVED,
+ ).to_string()
+ } else {
+ c.to_string()
+ }
+ })
+ .collect()
+ },
+ ))
+ }
+ fn path(input: ParseInput<Rule>) -> ParseResult<File> {
+ Ok(parse_children!(input;
+ [path_component(components)..] => {
+ File { file_path: components.collect() }
}
- }
- );
-
- rule!(double_literal<core::Double>; children!(
- [numeric_double_literal(n)] => n,
- [minus_infinity_literal(n)] => std::f64::NEG_INFINITY.into(),
- [plus_infinity_literal(n)] => std::f64::INFINITY.into(),
- [NaN(n)] => std::f64::NAN.into(),
- ));
-
- rule!(natural_literal<core::Natural>;
- captured_str!(s) => {
- s.trim()
- .parse()
- .map_err(|e| format!("{}", e))?
- }
- );
+ ))
+ }
- rule!(integer_literal<core::Integer>;
- captured_str!(s) => {
- s.trim()
- .parse()
- .map_err(|e| format!("{}", e))?
- }
- );
-
- rule!(identifier<ParsedExpr>; span; children!(
- [variable(v)] => {
- spanned(span, Var(v))
- },
- [builtin(e)] => e,
- ));
-
- rule!(variable<V<Label>>; children!(
- [label(l), natural_literal(idx)] => {
- V(l, idx)
- },
- [label(l)] => {
- V(l, 0)
- },
- ));
-
- rule!(unquoted_path_component<&'a str>; captured_str!(s) => s);
- rule!(quoted_path_component<&'a str>; captured_str!(s) => s);
- rule!(path_component<String>; children!(
- [unquoted_path_component(s)] => s.to_string(),
- [quoted_path_component(s)] => {
- const RESERVED: &percent_encoding::AsciiSet =
- &percent_encoding::CONTROLS
- .add(b'=').add(b':').add(b'/').add(b'?')
- .add(b'#').add(b'[').add(b']').add(b'@')
- .add(b'!').add(b'$').add(b'&').add(b'\'')
- .add(b'(').add(b')').add(b'*').add(b'+')
- .add(b',').add(b';');
- s.chars()
- .map(|c| {
- // Percent-encode ascii chars
- if c.is_ascii() {
- percent_encoding::utf8_percent_encode(
- &c.to_string(),
- RESERVED,
- ).to_string()
- } else {
- c.to_string()
- }
- })
- .collect()
- },
- ));
- rule!(path<Vec<String>>; children!(
- [path_component(components)..] => {
- components.collect()
- }
- ));
-
- rule!(local<(FilePrefix, Vec<String>)>; children!(
- [parent_path(l)] => l,
- [here_path(l)] => l,
- [home_path(l)] => l,
- [absolute_path(l)] => l,
- ));
-
- rule!(parent_path<(FilePrefix, Vec<String>)>; children!(
- [path(p)] => (FilePrefix::Parent, p)
- ));
- rule!(here_path<(FilePrefix, Vec<String>)>; children!(
- [path(p)] => (FilePrefix::Here, p)
- ));
- rule!(home_path<(FilePrefix, Vec<String>)>; children!(
- [path(p)] => (FilePrefix::Home, p)
- ));
- rule!(absolute_path<(FilePrefix, Vec<String>)>; children!(
- [path(p)] => (FilePrefix::Absolute, p)
- ));
-
- rule!(scheme<Scheme>; captured_str!(s) => match s {
- "http" => Scheme::HTTP,
- "https" => Scheme::HTTPS,
- _ => unreachable!(),
- });
-
- rule!(http_raw<URL<ParsedExpr>>; children!(
- [scheme(sch), authority(auth), path(file_path)] => URL {
- scheme: sch,
- authority: auth,
- path: File { file_path },
- query: None,
- headers: None,
- },
- [scheme(sch), authority(auth), path(file_path), query(q)] => {
- URL {
+ fn local(input: ParseInput<Rule>) -> ParseResult<(FilePrefix, File)> {
+ Ok(parse_children!(input;
+ [parent_path(l)] => l,
+ [here_path(l)] => l,
+ [home_path(l)] => l,
+ [absolute_path(l)] => l,
+ ))
+ }
+
+ fn parent_path(input: ParseInput<Rule>) -> ParseResult<(FilePrefix, File)> {
+ Ok(parse_children!(input;
+ [path(p)] => (FilePrefix::Parent, p)
+ ))
+ }
+ fn here_path(input: ParseInput<Rule>) -> ParseResult<(FilePrefix, File)> {
+ Ok(parse_children!(input;
+ [path(p)] => (FilePrefix::Here, p)
+ ))
+ }
+ fn home_path(input: ParseInput<Rule>) -> ParseResult<(FilePrefix, File)> {
+ Ok(parse_children!(input;
+ [path(p)] => (FilePrefix::Home, p)
+ ))
+ }
+ fn absolute_path(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<(FilePrefix, File)> {
+ Ok(parse_children!(input;
+ [path(p)] => (FilePrefix::Absolute, p)
+ ))
+ }
+
+ fn scheme(input: ParseInput<Rule>) -> ParseResult<Scheme> {
+ Ok(match input.as_str() {
+ "http" => Scheme::HTTP,
+ "https" => Scheme::HTTPS,
+ _ => unreachable!(),
+ })
+ }
+
+ fn http_raw<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<URL<Expr<E>>> {
+ Ok(parse_children!(input;
+ [scheme(sch), authority(auth), path(p)] => URL {
scheme: sch,
authority: auth,
- path: File { file_path },
+ path: p,
+ query: None,
+ headers: None,
+ },
+ [scheme(sch), authority(auth), path(p), query(q)] => URL {
+ scheme: sch,
+ authority: auth,
+ path: p,
query: Some(q),
headers: None,
- }
- },
- ));
+ },
+ ))
+ }
- rule!(authority<String>; captured_str!(s) => s.to_owned());
+ fn authority(input: ParseInput<Rule>) -> ParseResult<String> {
+ Ok(input.as_str().to_owned())
+ }
- rule!(query<String>; captured_str!(s) => s.to_owned());
+ fn query(input: ParseInput<Rule>) -> ParseResult<String> {
+ Ok(input.as_str().to_owned())
+ }
- rule!(http<URL<ParsedExpr>>; children!(
+ fn http<E: Clone>(input: ParseInput<Rule>) -> ParseResult<URL<Expr<E>>> {
+ Ok(parse_children!(input;
[http_raw(url)] => url,
[http_raw(url), import_expression(e)] =>
URL { headers: Some(e), ..url },
- ));
-
- rule!(env<String>; children!(
- [bash_environment_variable(s)] => s,
- [posix_environment_variable(s)] => s,
- ));
- rule!(bash_environment_variable<String>; captured_str!(s) => s.to_owned());
- rule!(posix_environment_variable<String>; children!(
- [posix_environment_variable_character(chars)..] => {
- chars.collect()
- },
- ));
- rule!(posix_environment_variable_character<Cow<'a, str>>;
- captured_str!(s) => {
- match s {
- "\\\"" => Cow::Owned("\"".to_owned()),
- "\\\\" => Cow::Owned("\\".to_owned()),
- "\\a" => Cow::Owned("\u{0007}".to_owned()),
- "\\b" => Cow::Owned("\u{0008}".to_owned()),
- "\\f" => Cow::Owned("\u{000C}".to_owned()),
- "\\n" => Cow::Owned("\n".to_owned()),
- "\\r" => Cow::Owned("\r".to_owned()),
- "\\t" => Cow::Owned("\t".to_owned()),
- "\\v" => Cow::Owned("\u{000B}".to_owned()),
- _ => Cow::Borrowed(s)
- }
- }
- );
-
- rule!(missing<()>);
-
- rule!(import_type<ImportLocation<ParsedExpr>>; children!(
- [missing(_)] => {
- ImportLocation::Missing
- },
- [env(e)] => {
- ImportLocation::Env(e)
- },
- [http(url)] => {
- ImportLocation::Remote(url)
- },
- [local((prefix, file_path))] => {
- ImportLocation::Local(prefix, File { file_path })
- },
- ));
-
- rule!(hash<Hash>; captured_str!(s) => {
- let s = s.trim();
+ ))
+ }
+
+ fn env(input: ParseInput<Rule>) -> ParseResult<String> {
+ Ok(parse_children!(input;
+ [bash_environment_variable(s)] => s,
+ [posix_environment_variable(s)] => s,
+ ))
+ }
+ fn bash_environment_variable(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<String> {
+ Ok(input.as_str().to_owned())
+ }
+ fn posix_environment_variable(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<String> {
+ Ok(parse_children!(input;
+ [posix_environment_variable_character(chars)..] => {
+ chars.collect()
+ },
+ ))
+ }
+ fn posix_environment_variable_character<'a>(
+ input: ParseInput<'a, Rule>,
+ ) -> ParseResult<Cow<'a, str>> {
+ Ok(match input.as_str() {
+ "\\\"" => Cow::Owned("\"".to_owned()),
+ "\\\\" => Cow::Owned("\\".to_owned()),
+ "\\a" => Cow::Owned("\u{0007}".to_owned()),
+ "\\b" => Cow::Owned("\u{0008}".to_owned()),
+ "\\f" => Cow::Owned("\u{000C}".to_owned()),
+ "\\n" => Cow::Owned("\n".to_owned()),
+ "\\r" => Cow::Owned("\r".to_owned()),
+ "\\t" => Cow::Owned("\t".to_owned()),
+ "\\v" => Cow::Owned("\u{000B}".to_owned()),
+ s => Cow::Borrowed(s),
+ })
+ }
+
+ fn missing(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+
+ fn import_type<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<ImportLocation<Expr<E>>> {
+ Ok(parse_children!(input;
+ [missing(_)] => {
+ ImportLocation::Missing
+ },
+ [env(e)] => {
+ ImportLocation::Env(e)
+ },
+ [http(url)] => {
+ ImportLocation::Remote(url)
+ },
+ [local((prefix, p))] => {
+ ImportLocation::Local(prefix, p)
+ },
+ ))
+ }
+
+ fn hash(input: ParseInput<Rule>) -> ParseResult<Hash> {
+ let s = input.as_str().trim();
let protocol = &s[..6];
let hash = &s[7..];
if protocol != "sha256" {
- Err(format!("Unknown hashing protocol '{}'", protocol))?
+ Err(input.error(format!("Unknown hashing protocol '{}'", protocol)))?
}
- Hash::SHA256(hex::decode(hash).unwrap())
- });
+ Ok(Hash::SHA256(hex::decode(hash).unwrap()))
+ }
- rule!(import_hashed<crate::Import<ParsedExpr>>; children!(
+ fn import_hashed<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<crate::Import<Expr<E>>> {
+ Ok(parse_children!(input;
[import_type(location)] =>
crate::Import {mode: ImportMode::Code, location, hash: None },
[import_type(location), hash(h)] =>
- crate::Import {mode: ImportMode::Code, location, hash: Some(h) },
- ));
-
- rule!(Text<()>);
- rule!(Location<()>);
-
- rule!(import<ParsedExpr>; span; children!(
- [import_hashed(imp)] => {
- spanned(span, Import(crate::Import {
- mode: ImportMode::Code,
- ..imp
- }))
- },
- [import_hashed(imp), Text(_)] => {
- spanned(span, Import(crate::Import {
- mode: ImportMode::RawText,
- ..imp
- }))
- },
- [import_hashed(imp), Location(_)] => {
- spanned(span, Import(crate::Import {
- mode: ImportMode::Location,
- ..imp
- }))
- },
- ));
-
- rule!(lambda<()>);
- rule!(forall<()>);
- rule!(arrow<()>);
- rule!(merge<()>);
- rule!(assert<()>);
- rule!(if_<()>);
- rule!(in_<()>);
- rule!(toMap<()>);
-
- rule!(empty_list_literal<ParsedExpr>; span; children!(
- [application_expression(e)] => {
- spanned(span, EmptyListLit(e))
- },
- ));
-
- rule!(expression<ParsedExpr>; span; children!(
- [lambda(()), label(l), expression(typ),
- arrow(()), expression(body)] => {
- spanned(span, Lam(l, typ, body))
- },
- [if_(()), expression(cond), expression(left), expression(right)] => {
- spanned(span, BoolIf(cond, left, right))
- },
- [let_binding(bindings).., in_(()), expression(final_expr)] => {
- bindings.rev().fold(
- final_expr,
- |acc, x| unspanned(Let(x.0, x.1, x.2, acc))
- )
- },
- [forall(()), label(l), expression(typ),
- arrow(()), expression(body)] => {
- spanned(span, Pi(l, typ, body))
- },
- [operator_expression(typ), arrow(()), expression(body)] => {
- spanned(span, Pi("_".into(), typ, body))
- },
- [merge(()), import_expression(x), import_expression(y),
- application_expression(z)] => {
- spanned(span, Merge(x, y, Some(z)))
- },
- [empty_list_literal(e)] => e,
- [assert(()), expression(x)] => {
- spanned(span, Assert(x))
- },
- [toMap(()), import_expression(x), application_expression(y)] => {
- spanned(span, ToMap(x, Some(y)))
- },
- [operator_expression(e)] => e,
- [operator_expression(e), expression(annot)] => {
- spanned(span, Annot(e, annot))
- },
- ));
-
- rule!(let_binding<(Label, Option<ParsedExpr>, ParsedExpr)>;
- children!(
- [label(name), expression(annot), expression(expr)] =>
- (name, Some(annot), expr),
- [label(name), expression(expr)] =>
- (name, None, expr),
- ));
-
- rule!(List<()>);
- rule!(Optional<()>);
-
- rule!(operator_expression<ParsedExpr>; prec_climb!(
- application_expression,
- {
- use Rule::*;
- // In order of precedence
- let operators = vec![
- import_alt,
- bool_or,
- natural_plus,
- text_append,
- list_append,
- bool_and,
- combine,
- prefer,
- combine_types,
- natural_times,
- bool_eq,
- bool_ne,
- equivalent,
- ];
- PrecClimber::new(
- operators
- .into_iter()
- .map(|op| pcl::Operator::new(op, pcl::Assoc::Left))
- .collect(),
- )
- },
- (l, op, r) => {
- use crate::BinOp::*;
- use Rule::*;
- let op = match op.as_rule() {
- import_alt => ImportAlt,
- bool_or => BoolOr,
- natural_plus => NaturalPlus,
- text_append => TextAppend,
- list_append => ListAppend,
- bool_and => BoolAnd,
- combine => RecursiveRecordMerge,
- prefer => RightBiasedRecordMerge,
- combine_types => RecursiveRecordTypeMerge,
- natural_times => NaturalTimes,
- bool_eq => BoolEQ,
- bool_ne => BoolNE,
- equivalent => Equivalence,
- r => Err(
- format!("Rule {:?} isn't an operator", r),
- )?,
- };
-
- unspanned(BinOp(op, l, r))
- }
- ));
-
- rule!(Some_<()>);
-
- rule!(application_expression<ParsedExpr>; children!(
- [first_application_expression(e)] => e,
- [first_application_expression(first), import_expression(rest)..] => {
- rest.fold(first, |acc, e| unspanned(App(acc, e)))
- },
- ));
-
- rule!(first_application_expression<ParsedExpr>; span;
- children!(
- [Some_(()), import_expression(e)] => {
- spanned(span, SomeLit(e))
- },
- [merge(()), import_expression(x), import_expression(y)] => {
- spanned(span, Merge(x, y, None))
- },
- [toMap(()), import_expression(x)] => {
- spanned(span, ToMap(x, None))
- },
- [import_expression(e)] => e,
- ));
-
- rule!(import_expression<ParsedExpr>; span;
- children!(
- [selector_expression(e)] => e,
- [import(e)] => e,
- ));
-
- rule!(selector_expression<ParsedExpr>; children!(
- [primitive_expression(e)] => e,
- [primitive_expression(first), selector(rest)..] => {
- rest.fold(first, |acc, e| unspanned(match e {
- Either::Left(l) => Field(acc, l),
- Either::Right(ls) => Projection(acc, ls),
- }))
- },
- ));
-
- rule!(selector<Either<Label, DupTreeSet<Label>>>; children!(
- [label(l)] => Either::Left(l),
- [labels(ls)] => Either::Right(ls),
- [expression(e)] => unimplemented!("selection by expression"), // TODO
- ));
-
- rule!(labels<DupTreeSet<Label>>; children!(
- [label(ls)..] => ls.collect(),
- ));
-
- rule!(primitive_expression<ParsedExpr>; span; children!(
- [double_literal(n)] => spanned(span, DoubleLit(n)),
- [natural_literal(n)] => spanned(span, NaturalLit(n)),
- [integer_literal(n)] => spanned(span, IntegerLit(n)),
- [double_quote_literal(s)] => spanned(span, TextLit(s)),
- [single_quote_literal(s)] => spanned(span, TextLit(s)),
- [empty_record_type(e)] => e,
- [empty_record_literal(e)] => e,
- [non_empty_record_type_or_literal(e)] => e,
- [union_type(e)] => e,
- [non_empty_list_literal(e)] => e,
- [identifier(e)] => e,
- [expression(e)] => e,
- ));
-
- rule!(empty_record_literal<ParsedExpr>; span;
- captured_str!(_) => spanned(span, RecordLit(Default::default()))
- );
-
- rule!(empty_record_type<ParsedExpr>; span;
- captured_str!(_) => spanned(span, RecordType(Default::default()))
- );
-
- rule!(non_empty_record_type_or_literal<ParsedExpr>; span;
- children!(
- [label(first_label), non_empty_record_type(rest)] => {
- let (first_expr, mut map) = rest;
- map.insert(first_label, first_expr);
- spanned(span, RecordType(map))
- },
- [label(first_label), non_empty_record_literal(rest)] => {
- let (first_expr, mut map) = rest;
- map.insert(first_label, first_expr);
- spanned(span, RecordLit(map))
- },
- ));
-
- rule!(non_empty_record_type
- <(ParsedExpr, DupTreeMap<Label, ParsedExpr>)>; children!(
- [expression(expr), record_type_entry(entries)..] => {
- (expr, entries.collect())
- }
- ));
+ crate::Import {mode: ImportMode::Code, location, hash: Some(h) },
+ ))
+ }
- rule!(record_type_entry<(Label, ParsedExpr)>; children!(
- [label(name), expression(expr)] => (name, expr)
- ));
+ fn Text(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn Location(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
- rule!(non_empty_record_literal
- <(ParsedExpr, DupTreeMap<Label, ParsedExpr>)>; children!(
- [expression(expr), record_literal_entry(entries)..] => {
- (expr, entries.collect())
- }
- ));
-
- rule!(record_literal_entry<(Label, ParsedExpr)>; children!(
- [label(name), expression(expr)] => (name, expr)
- ));
-
- rule!(union_type<ParsedExpr>; span; children!(
- [empty_union_type(_)] => {
- spanned(span, UnionType(Default::default()))
- },
- [union_type_entry(entries)..] => {
- spanned(span, UnionType(entries.collect()))
- },
- ));
-
- rule!(empty_union_type<()>);
-
- rule!(union_type_entry<(Label, Option<ParsedExpr>)>; children!(
- [label(name), expression(expr)] => (name, Some(expr)),
- [label(name)] => (name, None),
- ));
-
- rule!(non_empty_list_literal<ParsedExpr>; span;
- children!(
- [expression(items)..] => spanned(
- span,
- NEListLit(items.collect())
- )
- ));
+ fn import<E: Clone>(input: ParseInput<Rule>) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [import_hashed(imp)] => {
+ spanned(span, Import(crate::Import {
+ mode: ImportMode::Code,
+ ..imp
+ }))
+ },
+ [import_hashed(imp), Text(_)] => {
+ spanned(span, Import(crate::Import {
+ mode: ImportMode::RawText,
+ ..imp
+ }))
+ },
+ [import_hashed(imp), Location(_)] => {
+ spanned(span, Import(crate::Import {
+ mode: ImportMode::Location,
+ ..imp
+ }))
+ },
+ ))
+ }
+
+ fn lambda(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn forall(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn arrow(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn merge(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn assert(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn if_(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn in_(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn toMap(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
- rule!(final_expression<ParsedExpr>; children!(
- [expression(e), EOI(_)] => e
- ));
+ fn empty_list_literal<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [application_expression(e)] => {
+ spanned(span, EmptyListLit(e))
+ },
+ ))
+ }
+
+ fn expression<E: Clone>(input: ParseInput<Rule>) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [lambda(()), label(l), expression(typ),
+ arrow(()), expression(body)] => {
+ spanned(span, Lam(l, typ, body))
+ },
+ [if_(()), expression(cond), expression(left),
+ expression(right)] => {
+ spanned(span, BoolIf(cond, left, right))
+ },
+ [let_binding(bindings).., in_(()), expression(final_expr)] => {
+ bindings.rev().fold(
+ final_expr,
+ |acc, x| unspanned(Let(x.0, x.1, x.2, acc))
+ )
+ },
+ [forall(()), label(l), expression(typ),
+ arrow(()), expression(body)] => {
+ spanned(span, Pi(l, typ, body))
+ },
+ [operator_expression(typ), arrow(()), expression(body)] => {
+ spanned(span, Pi("_".into(), typ, body))
+ },
+ [merge(()), import_expression(x), import_expression(y),
+ application_expression(z)] => {
+ spanned(span, Merge(x, y, Some(z)))
+ },
+ [empty_list_literal(e)] => e,
+ [assert(()), expression(x)] => {
+ spanned(span, Assert(x))
+ },
+ [toMap(()), import_expression(x), application_expression(y)] => {
+ spanned(span, ToMap(x, Some(y)))
+ },
+ [operator_expression(e)] => e,
+ [operator_expression(e), expression(annot)] => {
+ spanned(span, Annot(e, annot))
+ },
+ ))
+ }
+
+ fn let_binding<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<(Label, Option<Expr<E>>, Expr<E>)> {
+ Ok(parse_children!(input;
+ [label(name), expression(annot), expression(expr)] =>
+ (name, Some(annot), expr),
+ [label(name), expression(expr)] =>
+ (name, None, expr),
+ ))
+ }
+
+ fn List(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+ fn Optional(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+
+ #[prec_climb(application_expression, PRECCLIMBER)]
+ fn operator_expression<E: Clone>(
+ input: ParseInput<Rule>,
+ l: Expr<E>,
+ op: Pair<Rule>,
+ r: Expr<E>,
+ ) -> ParseResult<Expr<E>> {
+ use crate::BinOp::*;
+ use Rule::*;
+ let op = match op.as_rule() {
+ import_alt => ImportAlt,
+ bool_or => BoolOr,
+ natural_plus => NaturalPlus,
+ text_append => TextAppend,
+ list_append => ListAppend,
+ bool_and => BoolAnd,
+ combine => RecursiveRecordMerge,
+ prefer => RightBiasedRecordMerge,
+ combine_types => RecursiveRecordTypeMerge,
+ natural_times => NaturalTimes,
+ bool_eq => BoolEQ,
+ bool_ne => BoolNE,
+ equivalent => Equivalence,
+ r => Err(input.error(format!("Rule {:?} isn't an operator", r)))?,
+ };
+
+ Ok(unspanned(BinOp(op, l, r)))
+ }
+
+ fn Some_(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+
+ fn application_expression<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ Ok(parse_children!(input;
+ [first_application_expression(e)] => e,
+ [first_application_expression(first),
+ import_expression(rest)..] => {
+ rest.fold(first, |acc, e| unspanned(App(acc, e)))
+ },
+ ))
+ }
+
+ fn first_application_expression<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [Some_(()), import_expression(e)] => {
+ spanned(span, SomeLit(e))
+ },
+ [merge(()), import_expression(x), import_expression(y)] => {
+ spanned(span, Merge(x, y, None))
+ },
+ [toMap(()), import_expression(x)] => {
+ spanned(span, ToMap(x, None))
+ },
+ [import_expression(e)] => e,
+ ))
+ }
+
+ fn import_expression<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ Ok(parse_children!(input;
+ [selector_expression(e)] => e,
+ [import(e)] => e,
+ ))
+ }
+
+ fn selector_expression<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ Ok(parse_children!(input;
+ [primitive_expression(e)] => e,
+ [primitive_expression(first), selector(rest)..] => {
+ rest.fold(first, |acc, e| unspanned(match e {
+ Either::Left(l) => Field(acc, l),
+ Either::Right(ls) => Projection(acc, ls),
+ }))
+ },
+ ))
+ }
+
+ fn selector(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Either<Label, DupTreeSet<Label>>> {
+ Ok(parse_children!(input;
+ [label(l)] => Either::Left(l),
+ [labels(ls)] => Either::Right(ls),
+ // [expression(_e)] => unimplemented!("selection by expression"), // TODO
+ ))
+ }
+
+ fn labels(input: ParseInput<Rule>) -> ParseResult<DupTreeSet<Label>> {
+ Ok(parse_children!(input;
+ [label(ls)..] => ls.collect(),
+ ))
+ }
+
+ fn primitive_expression<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [double_literal(n)] => spanned(span, DoubleLit(n)),
+ [natural_literal(n)] => spanned(span, NaturalLit(n)),
+ [integer_literal(n)] => spanned(span, IntegerLit(n)),
+ [double_quote_literal(s)] => spanned(span, TextLit(s)),
+ [single_quote_literal(s)] => spanned(span, TextLit(s)),
+ [empty_record_type(e)] => e,
+ [empty_record_literal(e)] => e,
+ [non_empty_record_type_or_literal(e)] => e,
+ [union_type(e)] => e,
+ [non_empty_list_literal(e)] => e,
+ [identifier(e)] => e,
+ [expression(e)] => e,
+ ))
+ }
+
+ fn empty_record_literal<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(spanned(span, RecordLit(Default::default())))
+ }
+
+ fn empty_record_type<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(spanned(span, RecordType(Default::default())))
+ }
+
+ fn non_empty_record_type_or_literal<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [label(first_label), non_empty_record_type(rest)] => {
+ let (first_expr, mut map) = rest;
+ map.insert(first_label, first_expr);
+ spanned(span, RecordType(map))
+ },
+ [label(first_label), non_empty_record_literal(rest)] => {
+ let (first_expr, mut map) = rest;
+ map.insert(first_label, first_expr);
+ spanned(span, RecordLit(map))
+ },
+ ))
+ }
+
+ fn non_empty_record_type<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<(Expr<E>, DupTreeMap<Label, Expr<E>>)> {
+ Ok(parse_children!(input;
+ [expression(expr), record_type_entry(entries)..] => {
+ (expr, entries.collect())
+ }
+ ))
+ }
+
+ fn record_type_entry<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<(Label, Expr<E>)> {
+ Ok(parse_children!(input;
+ [label(name), expression(expr)] => (name, expr)
+ ))
+ }
+
+ fn non_empty_record_literal<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<(Expr<E>, DupTreeMap<Label, Expr<E>>)> {
+ Ok(parse_children!(input;
+ [expression(expr), record_literal_entry(entries)..] => {
+ (expr, entries.collect())
+ }
+ ))
+ }
+
+ fn record_literal_entry<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<(Label, Expr<E>)> {
+ Ok(parse_children!(input;
+ [label(name), expression(expr)] => (name, expr)
+ ))
+ }
+
+ fn union_type<E: Clone>(input: ParseInput<Rule>) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [empty_union_type(_)] => {
+ spanned(span, UnionType(Default::default()))
+ },
+ [union_type_entry(entries)..] => {
+ spanned(span, UnionType(entries.collect()))
+ },
+ ))
+ }
+
+ fn empty_union_type(_: ParseInput<Rule>) -> ParseResult<()> {
+ Ok(())
+ }
+
+ fn union_type_entry<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<(Label, Option<Expr<E>>)> {
+ Ok(parse_children!(input;
+ [label(name), expression(expr)] => (name, Some(expr)),
+ [label(name)] => (name, None),
+ ))
+ }
+
+ fn non_empty_list_literal<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ let span = input.as_span();
+ Ok(parse_children!(input;
+ [expression(items)..] => spanned(
+ span,
+ NEListLit(items.collect())
+ )
+ ))
+ }
+
+ fn final_expression<E: Clone>(
+ input: ParseInput<Rule>,
+ ) -> ParseResult<Expr<E>> {
+ Ok(parse_children!(input;
+ [expression(e), EOI(_)] => e
+ ))
+ }
}
-pub fn parse_expr(s: &str) -> ParseResult<ParsedExpr> {
- let mut pairs = DhallParser::parse(Rule::final_expression, s)?;
- let rc_input = s.to_string().into();
- let expr = EntryPoint::final_expression(rc_input, pairs.next().unwrap())?;
- assert_eq!(pairs.next(), None);
- Ok(expr)
+pub fn parse_expr<E: Clone>(s: &str) -> ParseResult<Expr<E>> {
+ let input = ParseInput::parse(s, Rule::final_expression)?;
+ Parsers::final_expression(input)
}
diff --git a/improved_slice_patterns/src/lib.rs b/improved_slice_patterns/src/lib.rs
index 5478c1b..1669207 100644
--- a/improved_slice_patterns/src/lib.rs
+++ b/improved_slice_patterns/src/lib.rs
@@ -15,7 +15,7 @@
/// Contrary to slice_patterns, this allows moving out
/// of the iterator.
///
-/// A variable length pattern (`x..`) is only allowed as the last
+/// A variable length pattern (`x @ ..`) is only allowed as the last
/// pattern, unless the iterator is double-ended.
///
/// Example:
@@ -25,7 +25,7 @@
/// let vec = vec![Some(1), Some(2), Some(3), None];
///
/// let res = destructure_iter!(vec.into_iter();
-/// [Some(x), y.., z] => {
+/// [Some(x), y @ .., z] => {
/// // x: usize
/// // y: impl Iterator<Option<usize>>
/// // z: Option<usize>
@@ -42,7 +42,8 @@
#[macro_export]
macro_rules! destructure_iter {
// Variable length pattern
- (@match_forwards, $iter:expr, ($body:expr), $x:ident.., $($rest:tt)*) => {
+ (@match_forwards, $iter:expr, ($body:expr),
+ $x:ident @ .., $($rest:tt)*) => {
$crate::destructure_iter!(@match_backwards,
$iter,
({
@@ -133,7 +134,7 @@ macro_rules! destructure_iter {
/// Contrary to slice_patterns, this allows moving out
/// of the `Vec`.
///
-/// A variable length pattern (`x..`) returns an iterator.
+/// A variable length pattern (`x @ ..`) returns an iterator.
///
/// Example:
/// ```edition2018
@@ -143,7 +144,7 @@ macro_rules! destructure_iter {
/// let vec = vec![Some(1), Some(2), Some(3), None];
///
/// let res = match_vec!(vec;
-/// [Some(_), y.., None] => {
+/// [Some(_), y @ .., None] => {
/// y.collect::<Vec<_>>()
/// },
/// [None, None] => {
@@ -158,7 +159,7 @@ macro_rules! destructure_iter {
/// let vec = vec![Some(1), Some(2), Some(3), None];
///
/// let res = match_vec!(vec;
-/// [Some(_), y.., Some(_)] => {
+/// [Some(_), y @ .., Some(_)] => {
/// y.collect::<Vec<_>>()
/// },
/// [None, None] => {
@@ -175,16 +176,16 @@ macro_rules! destructure_iter {
#[macro_export]
macro_rules! match_vec {
// Variable length pattern
- (@make_pat; ($($acc:tt)*), $x:ident.., $($rest:tt)*) => {
+ (@make_pat; ($($acc:tt)*), $x:ident @ .., $($rest:tt)*) => {
$crate::match_vec!(@make_pat;
- ($($acc)*, $x..),
+ ($($acc)*, $x @ ..),
$($rest)*
)
};
// Special variable length pattern with a common unary variant
(@make_pat; ($($acc:tt)*), $variant:ident ($x:ident).., $($rest:tt)*) => {
$crate::match_vec!(@make_pat;
- ($($acc)*, $x..),
+ ($($acc)*, $x @ ..),
$($rest)*
)
};
@@ -209,7 +210,7 @@ macro_rules! match_vec {
[$($acc)*]
};
- (@make_filter; $x:ident.., $($rest:tt)*) => {
+ (@make_filter; $x:ident @ .., $($rest:tt)*) => {
$crate::match_vec!(@make_filter;
$($rest)*
)
@@ -282,8 +283,8 @@ fn test() {
[Some(_x), None, None] => 4,
[Some(_x), None] => 2,
[None, Some(y)] => 1,
- [None, _y..] => 3,
- [_x.., Some(y), Some(z), None] => y - z,
+ [None, _y @ ..] => 3,
+ [_x @ .., Some(y), Some(z), None] => y - z,
[Some(ys)..] => ys.sum(),
[] => 0,
[..] => -1,
diff --git a/rust-toolchain b/rust-toolchain
index 50ef20a..1d00bee 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2019-03-22
+nightly-2019-09-03
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 00:53:36 +0000