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authorNadrieril2019-03-05 18:16:38 +0100
committerNadrieril2019-03-05 18:17:00 +0100
commitf46a205e2bde91bebd16ed7ebccbb3f203c4779e (patch)
tree2e92b2b1e2f5e24ed7debe5096076ce1c48df92a /dhall
parent7ed0b4c978e4ef4b30a764f5a5811c750fcd86c4 (diff)
Remove @get_err entrypoints from macros
Diffstat (limited to '')
-rw-r--r--dhall/src/parser.rs57
1 files changed, 20 insertions, 37 deletions
diff --git a/dhall/src/parser.rs b/dhall/src/parser.rs
index fb32ff0..936f577 100644
--- a/dhall/src/parser.rs
+++ b/dhall/src/parser.rs
@@ -71,7 +71,7 @@ fn debug_pair(pair: Pair<Rule>) -> String {
}
/* Macro to pattern-match iterators.
- * Panics if the sequence doesn't match, unless you use the @get_err entrypoint.
+ * Returns `Result<_, IterMatchError<_>>`.
*
* Example:
* ```
@@ -149,8 +149,13 @@ macro_rules! match_iter {
};
(@match $_:expr, $iter:expr) => {};
- // Entrypoints
- (@get_err, $iter:expr; ($($args:tt)*) => $body:expr) => {
+ (@panic; $($args:tt)*) => {
+ {
+ let ret: Result<_, IterMatchError<()>> = match_iter!($($args)*);
+ ret.unwrap()
+ }
+ };
+ ($iter:expr; ($($args:tt)*) => $body:expr) => {
{
#[allow(unused_mut)]
let mut iter = $iter;
@@ -162,19 +167,12 @@ macro_rules! match_iter {
ret
}
};
- ($($args:tt)*) => {
- {
- let ret: Result<_, IterMatchError<()>> = match_iter!(@get_err, $($args)*);
- ret.unwrap()
- }
- };
}
/* Extends match_iter with typed matches. Takes a callback that determines
* when a capture matches.
- * Panics if the sequence doesn't match, unless you use the @get_err entrypoint.
- * If using the @get_err entrypoint, errors returned by the callback will get propagated
- * using IterMatchError::Other.
+ * Returns `Result<_, IterMatchError<_>>`; errors returned by the callback will
+ * get propagated using IterMatchError::Other.
*
* Example:
* ```
@@ -214,7 +212,7 @@ macro_rules! match_iter_typed {
match_iter_typed!(@collect, ($($vars)*), ($($args)*), ($($acc)*), ())
};
(@collect, ($iter:expr, $body:expr, $callback:ident, $error:ident), ($($args:tt)*), ($($acc:tt)*), ($(,)*)) => {
- match_iter!(@get_err, $iter; ($($acc)*) => {
+ match_iter!($iter; ($($acc)*) => {
match_iter_typed!(@callback, $callback, $iter, $($args)*);
Ok($body)
})
@@ -252,8 +250,7 @@ macro_rules! match_iter_typed {
};
(@callback, $callback:ident, $iter:expr $(,)*) => {};
- // Entrypoints
- (@get_err, $callback:ident; $iter:expr; ($($args:tt)*) => $body:expr) => {
+ ($callback:ident; $iter:expr; ($($args:tt)*) => $body:expr) => {
{
#[allow(unused_mut)]
let mut iter = $iter;
@@ -263,18 +260,11 @@ macro_rules! match_iter_typed {
)
}
};
- ($($args:tt)*) => {
- {
- let ret: Result<_, IterMatchError<()>> = match_iter_typed!(@get_err, $($args)*);
- ret.unwrap()
- }
- };
}
/* Extends match_iter and match_iter_typed with branching.
- * Panics if the sequence doesn't match, unless you use the @get_err entrypoint.
- * If using the @get_err entrypoint, errors returned by the callback will get propagated
- * using IterMatchError::Other.
+ * Returns `Result<_, IterMatchError<_>>`; errors returned by the callback will
+ * get propagated using IterMatchError::Other.
* Allows multiple branches. The passed iterator must be Clone.
* Will check the branches in order, testing each branch using the callback macro provided.
*
@@ -291,10 +281,10 @@ macro_rules! match_iter_typed {
* Ok($x)
* };
* (@branch_callback, typed, $($args:tt)*) => {
- * match_iter_typed!(@get_err, callback; $($args)*)
+ * match_iter_typed!(callback; $($args)*)
* };
* (@branch_callback, untyped, $($args:tt)*) => {
- * match_iter!(@get_err, $($args)*)
+ * match_iter!($($args)*)
* };
* }
*
@@ -308,8 +298,7 @@ macro_rules! match_iter_typed {
*
*/
macro_rules! match_iter_branching {
- // Entrypoints
- (@get_err, $callback:ident; $iter:expr; $( $submac:ident!($($args:tt)*) => $body:expr ),* $(,)*) => {
+ ($callback:ident; $iter:expr; $( $submac:ident!($($args:tt)*) => $body:expr ),* $(,)*) => {
{
#[allow(unused_mut)]
let mut iter = $iter;
@@ -331,12 +320,6 @@ macro_rules! match_iter_branching {
}
}
};
- ($($args:tt)*) => {
- {
- let ret: Result<_, IterMatchError<()>> = match_iter_branching!(@get_err, $($args)*);
- ret.unwrap()
- }
- };
}
macro_rules! named {
@@ -361,7 +344,7 @@ macro_rules! match_pest {
$ty($x)
};
(@branch_callback, children, $($args:tt)*) => {
- match_iter_typed!(@get_err, match_pest; $($args)*)
+ match_iter_typed!(match_pest; $($args)*)
};
($pair:expr; $($args:tt)*) => {
@@ -369,7 +352,7 @@ macro_rules! match_pest {
let pair = $pair;
#[allow(unused_mut)]
let mut pairs = pair.clone().into_inner();
- let result = match_iter_branching!(@get_err, match_pest; pairs; $($args)*);
+ let result = match_iter_branching!(match_pest; pairs; $($args)*);
result.map_err(|e| match e {
IterMatchError::Other(e) => e,
_ => custom_parse_error(&pair, "No match found".to_owned()),
@@ -685,7 +668,7 @@ named!(final_expression<BoxExpr<'a>>;
pub fn parse_expr_pest(s: &str) -> ParseResult<BoxExpr> {
let pairs = DhallParser::parse(Rule::final_expression, s)?;
- match_iter!(pairs; (e) => final_expression(e))
+ match_iter!(@panic; pairs; (e) => final_expression(e))
}
#[test]