git.delta.rocks / jrsonnet / refs/commits / 166fbe9afc2a

1use jrsonnet_gcmodule::Acyclic;2use jrsonnet_ir::{3	ArgsDesc, AssertExpr, AssertStmt, BinaryOp, BindSpec, CompSpec, Destruct, DestructRest, Expr,4	ExprParam, ExprParams, FieldMember, FieldName, ForSpecData, IStr, IfElse, IfSpecData,5	ImportKind, IndexPart, LiteralType, Member, NumValue, ObjBody, ObjComp, ObjMembers, Slice,6	SliceDesc, Source, Span, Spanned, Visibility, unescape,7};8use peg::parser;910pub struct ParserSettings {11	pub source: Source,12}1314macro_rules! expr_bin {15	($a:ident $op:ident $b:ident) => {16		Expr::BinaryOp(Box::new(BinaryOp {17			lhs: $a,18			op: $op,19			rhs: $b,20		}))21	};22}23macro_rules! expr_un {24	($op:ident $a:ident) => {25		Expr::UnaryOp($op, Box::new($a))26	};27}2829parser! {30	pub grammar jsonnet_parser() for str {31		use peg::ParseLiteral;3233		rule eof() = quiet!{![_]} / expected!("<eof>")34		rule eol() = "\n" / eof()3536		/// Standard C-like comments37		rule comment()38			= "//" (!eol()[_])* eol()39			/ "/*" (!("*/")[_])* "*/"40			/ "#" (!eol()[_])* eol()4142		rule single_whitespace() = quiet!{([' ' | '\r' | '\n' | '\t'] / comment())} / expected!("<whitespace>")43		rule _() = quiet!{([' ' | '\r' | '\n' | '\t']+) / comment()}* / expected!("<whitespace>")4445		/// For comma-delimited elements46		rule comma() = quiet!{_ "," _} / expected!("<comma>")47		rule alpha() -> char = c:$(['_' | 'a'..='z' | 'A'..='Z']) {c.chars().next().unwrap()}48		rule digit() -> char = d:$(['0'..='9']) {d.chars().next().unwrap()}49		rule end_of_ident() = !['0'..='9' | '_' | 'a'..='z' | 'A'..='Z']50		/// Sequence of digits51		rule uint_str() -> &'input str = a:$(digit()+ ("_" digit()+)*) { a }52		/// Number in scientific notation format53		rule number() -> f64 = quiet!{a:$(uint_str() ("." uint_str())? (['e'|'E'] (s:['+'|'-'])? uint_str())?) {? a.replace('_',"").parse().map_err(|_| "<number>") }} / expected!("<number>")5455		/// Reserved word followed by any non-alphanumberic56		rule reserved() = ("assert" / "else" / "error" / "false" / "for" / "function" / "if" / "import" / "importstr" / "importbin" / "in" / "local" / "null" / "tailstrict" / "then" / "self" / "super" / "true") end_of_ident()57		rule id() -> IStr = v:$(quiet!{ !reserved() alpha() (alpha() / digit())*} / expected!("<identifier>")) { v.into() }5859		rule keyword(id: &'static str) -> ()60			= #{|input, pos| input.parse_string_literal(pos, id)} end_of_ident()6162		pub rule param(s: &ParserSettings) -> ExprParam = destruct:destruct(s) default:(_ "=" _ default:expr(s){default})? { ExprParam { destruct, default } }63		pub rule params(s: &ParserSettings) -> ExprParams64			= params:param(s) ** comma() comma()? { ExprParams::new(params) }65			/ { ExprParams::new(Vec::new()) }6667		pub rule arg(s: &ParserSettings) -> (Option<IStr>, Expr)68			= name:(quiet! { (s:id() _ "=" !['='] _ {s})? } / expected!("<argument name>")) expr:expr(s) {(name, expr)}6970		pub rule args(s: &ParserSettings) -> ArgsDesc71			= args:arg(s)**comma() comma()? {?72				let unnamed_count = args.iter().take_while(|(n, _)| n.is_none()).count();73				let mut unnamed = Vec::with_capacity(unnamed_count);74				let mut names = Vec::with_capacity(args.len() - unnamed_count);75				let mut values = Vec::with_capacity(args.len() - unnamed_count);76				let mut named_started = false;77				for (name, value) in args {78					if let Some(name) = name {79						named_started = true;80						names.push(name);81						values.push(value);82					} else {83						if named_started {84							return Err("<named argument>")85						}86						unnamed.push(value);87					}88				}89				Ok(ArgsDesc{unnamed, names, values})90			}9192		pub rule destruct_rest() -> DestructRest93			= "..." into:(_ into:id() {into})? {into.map_or_else(|| DestructRest::Drop, DestructRest::Keep)}94		pub rule destruct_array(s: &ParserSettings) -> Destruct95			= "[" _ start:destruct(s)**comma() rest:(96				comma() _ rest:destruct_rest()? end:(97					comma() end:destruct(s)**comma() (_ comma())? {end}98					/ comma()? {Vec::new()}99				) {(rest, end)}100				/ comma()? {(None, Vec::new())}101			) _ "]" {?102				#[cfg(feature = "exp-destruct")] return Ok(Destruct::Array {103					start,104					rest: rest.0,105					end: rest.1,106				});107				#[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")108			}109		pub rule destruct_object(s: &ParserSettings) -> Destruct110			= "{" _111				fields:(name:id() into:(_ ":" _ into:destruct(s) {into})? default:(_ "=" _ v:spanned(<expr(s)>, s) {v})? {(name, into, default)})**comma()112				rest:(113					comma() rest:destruct_rest()? {rest}114					/ comma()? {None}115				)116			_ "}" {?117				#[cfg(feature = "exp-destruct")] return Ok(Destruct::Object {118					fields,119					rest,120				});121				#[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")122			}123		pub rule destruct(s: &ParserSettings) -> Destruct124			= v:spanned(<id()>, s) {Destruct::Full(v)}125			/ "?" {?126				#[cfg(feature = "exp-destruct")] return Ok(Destruct::Skip);127				#[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")128			}129			/ arr:destruct_array(s) {arr}130			/ obj:destruct_object(s) {obj}131132		pub rule bind(s: &ParserSettings) -> BindSpec133			= into:destruct(s) _ "=" _ value:expr(s) {BindSpec::Field{into, value}}134			/ name:id() _ "(" _ params:params(s) _ ")" _ "=" _ value:expr(s) {BindSpec::Function{name, params, value}}135136		pub rule assertion(s: &ParserSettings) -> AssertStmt137			= keyword("assert") _ assertion:spanned(<expr(s)>, s) message:(_ ":" _ e:expr(s) {e})? { AssertStmt{assertion, message} }138139		pub rule whole_line() -> &'input str140			= str:$((!['\n'][_])* "\n") {str}141		pub rule string_block() -> String142			= "|||" chomped:"-"? (!['\n']single_whitespace())* "\n"143			empty_lines:$(['\n']*)144			prefix:[' ' | '\t']+ first_line:whole_line()145			lines:("\n" {"\n"} / [' ' | '\t']*<{prefix.len()}> s:whole_line() {s})*146			[' ' | '\t']*<, {prefix.len() - 1}> "|||"147			{148				let mut l = empty_lines.to_owned();149				l.push_str(first_line);150				l.extend(lines);151				if chomped.is_some() {152					debug_assert!(l.ends_with('\n'));153					l.truncate(l.len() - 1);154				}155				l156			}157158		rule hex_char()159			= quiet! { ['0'..='9' | 'a'..='f' | 'A'..='F'] } / expected!("<hex char>")160161		rule string_char(c: rule<()>)162			= (!['\\']!c()[_])+163			/ "\\\\"164			/ "\\u" hex_char() hex_char() hex_char() hex_char()165			/ "\\x" hex_char() hex_char()166			/ ['\\'] (quiet! { ['b' | 'f' | 'n' | 'r' | 't' | '"' | '\''] } / expected!("<escape character>"))167		pub rule string() -> String168			= ['"'] str:$(string_char(<"\"">)*) ['"'] {? unescape::unescape(str).ok_or("<escaped string>")}169			/ ['\''] str:$(string_char(<"\'">)*) ['\''] {? unescape::unescape(str).ok_or("<escaped string>")}170			/ quiet!{ "@'" str:$(("''" / (!['\''][_]))*) "'" {str.replace("''", "'")}171			/ "@\"" str:$(("\"\"" / (!['"'][_]))*) "\"" {str.replace("\"\"", "\"")}172			/ string_block() } / expected!("<string>")173174		pub rule field_name(s: &ParserSettings) -> FieldName175			= name:id() {FieldName::Fixed(name)}176			/ name:string() {FieldName::Fixed(name.into())}177			/ "[" _ expr:expr(s) _ "]" {FieldName::Dyn(expr)}178		pub rule visibility() -> Visibility179			= ":::" {Visibility::Unhide}180			/ "::" {Visibility::Hidden}181			/ ":" {Visibility::Normal}182		pub rule field(s: &ParserSettings) -> FieldMember183			= name:spanned(<field_name(s)>, s) _ plus:"+"? _ visibility:visibility() _ value:expr(s) {FieldMember{184				name,185				plus: plus.is_some(),186				params: None,187				visibility,188				value,189			}}190			/ name:spanned(<field_name(s)>, s) _ "(" _ params:params(s) _ ")" _ visibility:visibility() _ value:expr(s) {FieldMember{191				name,192				plus: false,193				params: Some(params),194				visibility,195				value,196			}}197		pub rule obj_local(s: &ParserSettings) -> BindSpec198			= keyword("local") _ bind:bind(s) {bind}199		pub rule member(s: &ParserSettings) -> Member200			= bind:obj_local(s) {Member::BindStmt(bind)}201			/ assertion:assertion(s) {Member::AssertStmt(assertion)}202			/ field:field(s) {Member::Field(field)}203		pub rule objinside(s: &ParserSettings) -> ObjBody204			=  members:(member(s) ** comma()) comma()? _ compspecs:compspecs(s)? {?205				Ok(if let Some(compspecs) = compspecs {206					let mut locals = Vec::new();207					let mut field = None;208					for member in members {209						match member {210							Member::Field(field_member) => if field.replace(field_member).is_some() {211								return Err("<object comprehension can only contain one field>")212							},213							Member::BindStmt(bind_spec) => locals.push(bind_spec),214							Member::AssertStmt(assert_stmt) => return Err("<asserts are unsupported in object comprehension>"),215						}216					}217					ObjBody::ObjComp(ObjComp {218						locals,219						field: Box::new(field.ok_or("<missing object comprehension field>")?),220						compspecs221					})222				} else {223					let mut locals = Vec::new();224					let mut asserts = Vec::new();225					let mut fields = Vec::new();226					for member in members {227						match member {228							Member::Field(field_member) => fields.push(field_member),229							Member::BindStmt(bind_spec) => locals.push(bind_spec),230							Member::AssertStmt(assert_stmt) => asserts.push(assert_stmt),231						}232					}233					ObjBody::MemberList(ObjMembers {234						locals,235						asserts,236						fields237					})238				})239			}240		pub rule ifspec(s: &ParserSettings) -> IfSpecData241			= i:spanned(<keyword("if")>, s) _ cond:expr(s) {IfSpecData { span: i.span, cond }}242		pub rule forspec(s: &ParserSettings) -> ForSpecData243			= keyword("for") _ destruct:destruct(s) _ keyword("in") _ over:expr(s) { ForSpecData { destruct, over } }244		rule compspec(s: &ParserSettings) -> CompSpec245			= i:ifspec(s) { CompSpec::IfSpec(i) } / f:forspec(s) {CompSpec::ForSpec(f)}246		pub rule compspecs(s: &ParserSettings) -> Vec<CompSpec>247			= specs:compspec(s) ++ _ {?248				if !matches!(specs[0], CompSpec::ForSpec(_)) {249					return Err("<first compspec should be for>")250				}251				Ok(specs)252			}253		pub rule local_expr(s: &ParserSettings) -> Expr254			= keyword("local") _ binds:bind(s) ** comma() (_ ",")? _ ";" _ expr:expr(s) { Expr::LocalExpr(binds, Box::new(expr)) }255		pub rule string_expr(s: &ParserSettings) -> Expr256			= s:string() {Expr::Str(s.into())}257		pub rule obj_expr(s: &ParserSettings) -> Expr258			= "{" _ body:objinside(s) _ "}" {Expr::Obj(body)}259		pub rule array_expr(s: &ParserSettings) -> Expr260			= "[" _ elems:(expr(s) ** comma()) _ comma()? "]" {Expr::Arr(elems)}261		pub rule array_comp_expr(s: &ParserSettings) -> Expr262			= "[" _ expr:expr(s) _ comma()? _ specs:(r: compspecs(s) _ {r}) "]" {263				Expr::ArrComp(Box::new(expr), specs)264			}265		pub rule number_expr(s: &ParserSettings) -> Expr266			= n:number() {? if let Some(n) = NumValue::new(n) {267				Ok(Expr::Num(n))268			} else {269				Err("!!!numbers are finite")270			}}271272		rule spanned<T: Acyclic>(x: rule<T>, s: &ParserSettings) -> Spanned<T>273			= a:position!() n:x() b:position!() { Spanned::new(n, Span(s.source.clone(), a as u32, b as u32)) }274275		pub rule var_expr(s: &ParserSettings) -> Expr276			= n:spanned(<id()>, s) { Expr::Var(n) }277		pub rule id_loc(s: &ParserSettings) -> Spanned<Expr>278			= a:position!() n:id() b:position!() { Spanned::new(Expr::Str(n), Span(s.source.clone(), a as u32,b as u32)) }279		pub rule if_then_else_expr(s: &ParserSettings) -> Expr280			= cond:ifspec(s) _ keyword("then") _ cond_then:expr(s) cond_else:(_ keyword("else") _ e:expr(s) {e})? {Expr::IfElse(Box::new(IfElse{281				cond,282				cond_then,283				cond_else,284			}))}285286		pub rule literal(s: &ParserSettings) -> Expr287			= v:(288				keyword("null") {LiteralType::Null}289				/ keyword("true") {LiteralType::True}290				/ keyword("false") {LiteralType::False}291				/ keyword("self") {LiteralType::This}292				/ keyword("$") {LiteralType::Dollar}293				/ keyword("super") {LiteralType::Super}294			) {Expr::Literal(v)}295296		rule import_kind() -> ImportKind297			= keyword("importstr") { ImportKind::Str }298			/ keyword("importbin") { ImportKind::Bin }299			/ keyword("import") { ImportKind::Normal }300301		pub rule expr_basic(s: &ParserSettings) -> Expr302			= literal(s)303304			/ string_expr(s) / number_expr(s)305			/ array_expr(s)306			/ obj_expr(s)307			/ array_expr(s)308			/ array_comp_expr(s)309310			/ kind:spanned(<import_kind()>, s) _ path:expr(s) {Expr::Import(kind, Box::new(path))}311312			/ var_expr(s)313			/ local_expr(s)314			/ if_then_else_expr(s)315316			/ keyword("function") _ "(" _ params:params(s) _ ")" _ expr:expr(s) {Expr::Function(params, Box::new(expr))}317			/ assert:assertion(s) _ ";" _ rest:expr(s) { Expr::AssertExpr(Box::new(AssertExpr{318				assert, rest319			})) }320321			/ err_kw:spanned(<keyword("error")>, s) _ expr:expr(s) { Expr::ErrorStmt(err_kw.span, Box::new(expr)) }322323		rule slice_part(s: &ParserSettings) -> Option<Spanned<Expr>>324			= _ e:(e:spanned(<expr(s)>, s) _{e})? {e}325		pub rule slice_desc(s: &ParserSettings) -> SliceDesc326			= start:slice_part(s) ":" pair:(end:slice_part(s) step:(":" e:slice_part(s){e})? {(end, step.flatten())})? {327				let (end, step) = if let Some((end, step)) = pair {328					(end, step)329				}else{330					(None, None)331				};332333				SliceDesc { start, end, step }334			}335336		rule binop(x: rule<()>) -> ()337			= quiet!{ x() } / expected!("<binary op>")338		rule unaryop(x: rule<()>) -> ()339			= quiet!{ x() } / expected!("<unary op>")340341		rule ensure_null_coaelse()342			= "" {?343				#[cfg(not(feature = "exp-null-coaelse"))] return Err("!!!experimental null coaelscing was not enabled");344				#[cfg(feature = "exp-null-coaelse")] Ok(())345			}346		use jrsonnet_ir::BinaryOpType::*;347		use jrsonnet_ir::UnaryOpType::*;348		rule expr(s: &ParserSettings) -> Expr349			= precedence! {350				a:(@) _ binop(<"||">) _ b:@ {expr_bin!(a Or b)}351				a:(@) _ binop(<"??">) _ ensure_null_coaelse() b:@ {352					#[cfg(feature = "exp-null-coaelse")] return expr_bin!(a NullCoaelse b);353					unreachable!("ensure_null_coaelse will fail if feature is not enabled")354				}355				--356				a:(@) _ binop(<"&&">) _ b:@ {expr_bin!(a And b)}357				--358				a:(@) _ binop(<"|">) _ b:@ {expr_bin!(a BitOr b)}359				--360				a:@ _ binop(<"^">) _ b:(@) {expr_bin!(a BitXor b)}361				--362				a:(@) _ binop(<"&">) _ b:@ {expr_bin!(a BitAnd b)}363				--364				a:(@) _ binop(<"==">) _ b:@ {expr_bin!(a Eq b)}365				a:(@) _ binop(<"!=">) _ b:@ {expr_bin!(a Neq b)}366				--367				a:(@) _ binop(<"<">) _ b:@ {expr_bin!(a Lt b)}368				a:(@) _ binop(<">">) _ b:@ {expr_bin!(a Gt b)}369				a:(@) _ binop(<"<=">) _ b:@ {expr_bin!(a Lte b)}370				a:(@) _ binop(<">=">) _ b:@ {expr_bin!(a Gte b)}371				a:(@) _ binop(<keyword("in")>) _ b:@ {expr_bin!(a In b)}372				--373				a:(@) _ binop(<"<<">) _ b:@ {expr_bin!(a Lhs b)}374				a:(@) _ binop(<">>">) _ b:@ {expr_bin!(a Rhs b)}375				--376				a:(@) _ binop(<"+">) _ b:@ {expr_bin!(a Add b)}377				a:(@) _ binop(<"-">) _ b:@ {expr_bin!(a Sub b)}378				--379				a:(@) _ binop(<"*">) _ b:@ {expr_bin!(a Mul b)}380				a:(@) _ binop(<"/">) _ b:@ {expr_bin!(a Div b)}381				a:(@) _ binop(<"%">) _ b:@ {expr_bin!(a Mod b)}382				--383						unaryop(<"+">) _ b:@ {expr_un!(Plus b)}384						unaryop(<"-">) _ b:@ {expr_un!(Minus b)}385						unaryop(<"!">) _ b:@ {expr_un!(Not b)}386						unaryop(<"~">) _ b:@ {expr_un!(BitNot b)}387				--388				value:(@) _ "[" _ slice:slice_desc(s) _ "]" {Expr::Slice(Box::new(Slice{value, slice}))}389				indexable:(@) _ parts:index_part(s)+ {Expr::Index{indexable: Box::new(indexable), parts}}390				a:(@) _ args:spanned(<"(" _ a:args(s) _ ")" {a}>, s) ts:(_ keyword("tailstrict"))? {Expr::Apply(Box::new(a), args, ts.is_some())}391				a:(@) _ "{" _ body:objinside(s) _ "}" {Expr::ObjExtend(Box::new(a), body)}392				--393				e:expr_basic(s) {e}394				"(" _ e:expr(s) _ ")" {e}395			}396		pub rule index_part(s: &ParserSettings) -> IndexPart397		= n:("?" _ ensure_null_coaelse())? "." _ value:id_loc(s) {IndexPart {398			span: value.span,399			value: value.value,400			#[cfg(feature = "exp-null-coaelse")]401			null_coaelse: n.is_some(),402		}}403		/ n:("?" _ "." _ ensure_null_coaelse())? value:spanned(<"[" _ v:expr(s) _ "]" {v}>, s) {IndexPart {404			span: value.span,405			value: value.value,406			#[cfg(feature = "exp-null-coaelse")]407			null_coaelse: n.is_some(),408		}}409410		pub rule jsonnet(s: &ParserSettings) -> Expr = _ e:expr(s) _ {e}411	}412}413414pub type ParseError = peg::error::ParseError<peg::str::LineCol>;415pub fn parse(str: &str, settings: &ParserSettings) -> Result<Expr, ParseError> {416	jsonnet_parser::jsonnet(str, settings)417}418/// Used for importstr values419pub fn string_to_expr(str: IStr, settings: &ParserSettings) -> Spanned<Expr> {420	let len = str.len();421	Spanned::new(Expr::Str(str), Span(settings.source.clone(), 0, len as u32))422}423424#[cfg(test)]425mod tests {426	use std::fs;427428	use insta::{assert_snapshot, glob};429	use jrsonnet_ir::{IStr, Source};430431	use crate::{ParserSettings, parse};432433	#[test]434	fn snapshots() {435		glob!("tests/*.jsonnet", |path| {436			let input = fs::read_to_string(path).expect("read test file");437			let v = parse(438				&input,439				&ParserSettings {440					source: Source::new_virtual("<test>".into(), IStr::empty()),441				},442			)443			.unwrap();444			let v = format!("{v:#?}");445			assert_snapshot!(v);446		});447	}448}