diff options
Diffstat (limited to 'dhall_syntax/src/parser.rs')
| -rw-r--r-- | dhall_syntax/src/parser.rs | 423 |
1 files changed, 177 insertions, 246 deletions
diff --git a/dhall_syntax/src/parser.rs b/dhall_syntax/src/parser.rs index c2ba19a..bd29a27 100644 --- a/dhall_syntax/src/parser.rs +++ b/dhall_syntax/src/parser.rs @@ -66,11 +66,15 @@ impl<'input> ParseInput<'input, Rule> { fn as_str(&self) -> &'input str { self.pair.as_str() } + fn as_rule(&self) -> Rule { + self.pair.as_rule() + } } -// Used to retrieve the `Rule` enum associated with the `Self` type in `parse_children`. +// Used by the macros. trait PestConsumer { - type RuleEnum: pest::RuleType; + type Rule: pest::RuleType; + fn rule_alias(rule: Self::Rule) -> String; } fn debug_pair(pair: Pair<Rule>) -> String { @@ -231,21 +235,17 @@ struct Parsers; #[make_parser(Rule)] impl Parsers { - fn EOI(_: ParseInput<Rule>) -> ParseResult<()> { + fn EOI(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } + #[alias(label)] fn simple_label(input: ParseInput<Rule>) -> ParseResult<Label> { - Ok(Label::from(input.as_str().trim().to_owned())) + Ok(Label::from(input.as_str())) } + #[alias(label)] 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, - )) + Ok(Label::from(input.as_str())) } fn double_quote_literal<E: Clone>( @@ -262,17 +262,15 @@ impl Parsers { input: ParseInput<Rule>, ) -> ParseResult<ParsedTextContents<E>> { Ok(parse_children!(input; - [interpolation(e)] => { + [expression(e)] => { InterpolatedTextContents::Expr(e) }, - [double_quote_escaped(s)] => { - InterpolatedTextContents::Text(s) - }, [double_quote_char(s)] => { - InterpolatedTextContents::Text(s.to_owned()) + InterpolatedTextContents::Text(s) }, )) } + #[alias(double_quote_char)] fn double_quote_escaped(input: ParseInput<Rule>) -> ParseResult<String> { Ok(match input.as_str() { "\"" => "\"".to_owned(), @@ -345,8 +343,8 @@ impl Parsers { } fn double_quote_char<'a>( input: ParseInput<'a, Rule>, - ) -> ParseResult<&'a str> { - Ok(input.as_str()) + ) -> ParseResult<String> { + Ok(input.as_str().to_owned()) } fn single_quote_literal<E: Clone>( @@ -356,6 +354,7 @@ impl Parsers { [single_quote_continue(lines)] => { let newline: ParsedText<E> = "\n".to_string().into(); + // Reverse lines and chars in each line let mut lines: Vec<ParsedText<E>> = lines .into_iter() .rev() @@ -377,44 +376,27 @@ impl Parsers { ) -> ParseResult<&'a str> { Ok(input.as_str()) } - fn escaped_quote_pair<'a>(_: ParseInput<'a, Rule>) -> ParseResult<&'a str> { + #[alias(single_quote_char)] + fn escaped_quote_pair<'a>( + _input: ParseInput<'a, Rule>, + ) -> ParseResult<&'a str> { Ok("''") } + #[alias(single_quote_char)] fn escaped_interpolation<'a>( - _: ParseInput<'a, Rule>, + _input: 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. 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 - }, - [escaped_interpolation(c), single_quote_continue(lines)] => { + [expression(e), single_quote_continue(lines)] => { + let c = InterpolatedTextContents::Expr(e); 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 }, @@ -435,38 +417,41 @@ impl Parsers { )) } + #[alias(expression)] 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(input - .error(format!("Unrecognized builtin: '{}'", s)))?, - } - } + let e = 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(input.error(format!("Unrecognized builtin: '{}'", s)))?, }, - )) + }; + Ok(spanned(input.as_span(), e)) } - fn NaN(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) + #[alias(double_literal)] + fn NaN(_input: ParseInput<Rule>) -> ParseResult<core::Double> { + Ok(std::f64::NAN.into()) } - fn minus_infinity_literal(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) + #[alias(double_literal)] + fn minus_infinity_literal( + _input: ParseInput<Rule>, + ) -> ParseResult<core::Double> { + Ok(std::f64::NEG_INFINITY.into()) } - fn plus_infinity_literal(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) + #[alias(double_literal)] + fn plus_infinity_literal( + _input: ParseInput<Rule>, + ) -> ParseResult<core::Double> { + Ok(std::f64::INFINITY.into()) } + #[alias(double_literal)] fn numeric_double_literal( input: ParseInput<Rule>, ) -> ParseResult<core::Double> { @@ -481,15 +466,6 @@ impl Parsers { } } - 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() @@ -506,13 +482,13 @@ impl Parsers { .map_err(|e| input.error(format!("{}", e))) } + #[alias(expression)] 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)) + spanned(input.as_span(), Var(v)) }, - [builtin(e)] => e, + [expression(e)] => e, )) } @@ -527,42 +503,40 @@ impl Parsers { )) } + #[alias(path_component)] fn unquoted_path_component<'a>( input: ParseInput<'a, Rule>, - ) -> ParseResult<&'a str> { - Ok(input.as_str()) + ) -> ParseResult<String> { + Ok(input.as_str().to_string()) } + #[alias(path_component)] 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() - }, - )) + ) -> ParseResult<String> { + #[rustfmt::skip] + 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';'); + Ok(input + .as_str() + .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<Vec<String>> { Ok(parse_children!(input; @@ -572,17 +546,16 @@ impl Parsers { )) } - fn local( + #[alias(import_type)] + fn local<E: Clone>( input: ParseInput<Rule>, - ) -> ParseResult<(FilePrefix, Vec<String>)> { + ) -> ParseResult<ImportLocation<Expr<E>>> { Ok(parse_children!(input; - [parent_path(l)] => l, - [here_path(l)] => l, - [home_path(l)] => l, - [absolute_path(l)] => l, + [local_path((prefix, p))] => ImportLocation::Local(prefix, p), )) } + #[alias(local_path)] fn parent_path( input: ParseInput<Rule>, ) -> ParseResult<(FilePrefix, Vec<String>)> { @@ -590,6 +563,7 @@ impl Parsers { [path(p)] => (FilePrefix::Parent, p) )) } + #[alias(local_path)] fn here_path( input: ParseInput<Rule>, ) -> ParseResult<(FilePrefix, Vec<String>)> { @@ -597,6 +571,7 @@ impl Parsers { [path(p)] => (FilePrefix::Here, p) )) } + #[alias(local_path)] fn home_path( input: ParseInput<Rule>, ) -> ParseResult<(FilePrefix, Vec<String>)> { @@ -604,6 +579,7 @@ impl Parsers { [path(p)] => (FilePrefix::Home, p) )) } + #[alias(local_path)] fn absolute_path( input: ParseInput<Rule>, ) -> ParseResult<(FilePrefix, Vec<String>)> { @@ -649,25 +625,31 @@ impl Parsers { Ok(input.as_str().to_owned()) } - 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 }, - )) + #[alias(import_type)] + fn http<E: Clone>( + input: ParseInput<Rule>, + ) -> ParseResult<ImportLocation<Expr<E>>> { + Ok(ImportLocation::Remote(parse_children!(input; + [http_raw(url)] => url, + [http_raw(url), expression(e)] => URL { headers: Some(e), ..url }, + ))) } - fn env(input: ParseInput<Rule>) -> ParseResult<String> { + #[alias(import_type)] + fn env<E: Clone>( + input: ParseInput<Rule>, + ) -> ParseResult<ImportLocation<Expr<E>>> { Ok(parse_children!(input; - [bash_environment_variable(s)] => s, - [posix_environment_variable(s)] => s, + [environment_variable(v)] => ImportLocation::Env(v), )) } + #[alias(environment_variable)] fn bash_environment_variable( input: ParseInput<Rule>, ) -> ParseResult<String> { Ok(input.as_str().to_owned()) } + #[alias(environment_variable)] fn posix_environment_variable( input: ParseInput<Rule>, ) -> ParseResult<String> { @@ -694,27 +676,11 @@ impl Parsers { }) } - fn missing(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) - } - - fn import_type<E: Clone>( - input: ParseInput<Rule>, + #[alias(import_type)] + fn missing<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) - }, - )) + Ok(ImportLocation::Missing) } fn hash(input: ParseInput<Rule>) -> ParseResult<Hash> { @@ -730,78 +696,65 @@ impl Parsers { fn import_hashed<E: Clone>( input: ParseInput<Rule>, ) -> ParseResult<crate::Import<Expr<E>>> { + use crate::Import; + let mode = ImportMode::Code; 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) }, + [import_type(location)] => Import { mode, location, hash: None }, + [import_type(location), hash(h)] => Import { mode, location, hash: Some(h) }, )) } - fn Text(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) + #[alias(import_mode)] + fn Text(_input: ParseInput<Rule>) -> ParseResult<ImportMode> { + Ok(ImportMode::RawText) } - fn Location(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) + #[alias(import_mode)] + fn Location(_input: ParseInput<Rule>) -> ParseResult<ImportMode> { + Ok(ImportMode::Location) } + #[alias(expression)] fn import<E: Clone>(input: ParseInput<Rule>) -> ParseResult<Expr<E>> { - let span = input.as_span(); - Ok(parse_children!(input; + use crate::Import; + let import = 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 { mode: ImportMode::Code, ..imp } }, - [import_hashed(imp), Location(_)] => { - spanned(span, Import(crate::Import { - mode: ImportMode::Location, - ..imp - })) + [import_hashed(imp), import_mode(mode)] => { + Import { mode, ..imp } }, - )) + ); + Ok(spanned(input.as_span(), Import(import))) } - fn lambda(_: ParseInput<Rule>) -> ParseResult<()> { + fn lambda(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } - fn forall(_: ParseInput<Rule>) -> ParseResult<()> { + fn forall(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } - fn arrow(_: ParseInput<Rule>) -> ParseResult<()> { + fn arrow(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } - fn merge(_: ParseInput<Rule>) -> ParseResult<()> { + fn merge(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } - fn assert(_: ParseInput<Rule>) -> ParseResult<()> { + fn assert(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } - fn if_(_: ParseInput<Rule>) -> ParseResult<()> { + fn if_(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } - fn in_(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) - } - fn toMap(_: ParseInput<Rule>) -> ParseResult<()> { + fn toMap(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } + #[alias(expression)] 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)) - }, + [expression(e)] => spanned(input.as_span(), EmptyListLit(e)), )) } @@ -816,7 +769,7 @@ impl Parsers { expression(right)] => { spanned(span, BoolIf(cond, left, right)) }, - [let_binding(bindings).., in_(()), expression(final_expr)] => { + [let_binding(bindings).., expression(final_expr)] => { bindings.rev().fold( final_expr, |acc, x| unspanned(Let(x.0, x.1, x.2, acc)) @@ -826,24 +779,22 @@ impl Parsers { arrow(()), expression(body)] => { spanned(span, Pi(l, typ, body)) }, - [operator_expression(typ), arrow(()), expression(body)] => { + [expression(typ), arrow(()), expression(body)] => { spanned(span, Pi("_".into(), typ, body)) }, - [merge(()), import_expression(x), import_expression(y), - application_expression(z)] => { + [merge(()), expression(x), expression(y), 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)] => { + [toMap(()), expression(x), expression(y)] => { spanned(span, ToMap(x, Some(y))) }, - [operator_expression(e)] => e, - [operator_expression(e), expression(annot)] => { + [expression(e), expression(annot)] => { spanned(span, Annot(e, annot)) }, + [expression(e)] => e, )) } @@ -858,14 +809,8 @@ impl Parsers { )) } - fn List(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) - } - fn Optional(_: ParseInput<Rule>) -> ParseResult<()> { - Ok(()) - } - - #[prec_climb(application_expression, PRECCLIMBER)] + #[alias(expression)] + #[prec_climb(expression, PRECCLIMBER)] fn operator_expression<E: Clone>( input: ParseInput<Rule>, l: Expr<E>, @@ -894,55 +839,48 @@ impl Parsers { Ok(unspanned(BinOp(op, l, r))) } - fn Some_(_: ParseInput<Rule>) -> ParseResult<()> { + fn Some_(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } + #[alias(expression)] 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)..] => { + [expression(e)] => e, + [expression(first), expression(rest)..] => { rest.fold(first, |acc, e| unspanned(App(acc, e))) }, )) } + #[alias(expression)] 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)] => { + [Some_(()), expression(e)] => { spanned(span, SomeLit(e)) }, - [merge(()), import_expression(x), import_expression(y)] => { + [merge(()), expression(x), expression(y)] => { spanned(span, Merge(x, y, None)) }, - [toMap(()), import_expression(x)] => { + [toMap(()), 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, + [expression(e)] => e, )) } + #[alias(expression)] fn selector_expression<E: Clone>( input: ParseInput<Rule>, ) -> ParseResult<Expr<E>> { Ok(parse_children!(input; - [primitive_expression(e)] => e, - [primitive_expression(first), selector(rest)..] => { + [expression(e)] => e, + [expression(first), selector(rest)..] => { rest.fold(first, |acc, e| unspanned(match e { Either::Left(l) => Field(acc, l), Either::Right(ls) => Projection(acc, ls), @@ -967,6 +905,7 @@ impl Parsers { )) } + #[alias(expression)] fn primitive_expression<E: Clone>( input: ParseInput<Rule>, ) -> ParseResult<Expr<E>> { @@ -977,46 +916,41 @@ impl Parsers { [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, )) } + #[alias(expression)] fn empty_record_literal<E: Clone>( input: ParseInput<Rule>, ) -> ParseResult<Expr<E>> { - let span = input.as_span(); - Ok(spanned(span, RecordLit(Default::default()))) + Ok(spanned(input.as_span(), RecordLit(Default::default()))) } + #[alias(expression)] fn empty_record_type<E: Clone>( input: ParseInput<Rule>, ) -> ParseResult<Expr<E>> { - let span = input.as_span(); - Ok(spanned(span, RecordType(Default::default()))) + Ok(spanned(input.as_span(), RecordType(Default::default()))) } + #[alias(expression)] fn non_empty_record_type_or_literal<E: Clone>( input: ParseInput<Rule>, ) -> ParseResult<Expr<E>> { - let span = input.as_span(); - Ok(parse_children!(input; + let e = 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)) + 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)) + RecordLit(map) }, - )) + ); + Ok(spanned(input.as_span(), e)) } fn non_empty_record_type<E: Clone>( @@ -1055,19 +989,16 @@ impl Parsers { )) } + #[alias(expression)] 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())) - }, - )) + let map = parse_children!(input; + [empty_union_type(_)] => Default::default(), + [union_type_entry(entries)..] => entries.collect(), + ); + Ok(spanned(input.as_span(), UnionType(map))) } - fn empty_union_type(_: ParseInput<Rule>) -> ParseResult<()> { + fn empty_union_type(_input: ParseInput<Rule>) -> ParseResult<()> { Ok(()) } @@ -1080,13 +1011,13 @@ impl Parsers { )) } + #[alias(expression)] 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, + input.as_span(), NEListLit(items.collect()) ) )) |