1#![allow(clippy::redundant_closure_call, clippy::derive_partial_eq_without_eq)]23use std::rc::Rc;45use peg::parser;6mod expr;7pub use expr::*;8pub use jrsonnet_interner::IStr;9pub use peg;10mod location;11mod source;12mod unescape;13pub use location::CodeLocation;14pub use source::{15 Source, SourceDefaultIgnoreJpath, SourceDirectory, SourceFifo, SourceFile, SourcePath,16 SourcePathT, SourceVirtual,17};1819pub struct ParserSettings {20 pub source: Source,21}2223macro_rules! expr_bin {24 ($a:ident $op:ident $b:ident) => {25 Expr::BinaryOp(Box::new(BinaryOp {26 lhs: $a,27 op: $op,28 rhs: $b,29 }))30 };31}32macro_rules! expr_un {33 ($op:ident $a:ident) => {34 Expr::UnaryOp($op, Box::new($a))35 };36}3738parser! {39 grammar jsonnet_parser() for str {40 use peg::ParseLiteral;4142 rule eof() = quiet!{![_]} / expected!("<eof>")43 rule eol() = "\n" / eof()4445 46 rule comment()47 = "//" (!eol()[_])* eol()48 / "/*" (!("*/")[_])* "*/"49 / "#" (!eol()[_])* eol()5051 rule single_whitespace() = quiet!{([' ' | '\r' | '\n' | '\t'] / comment())} / expected!("<whitespace>")52 rule _() = quiet!{([' ' | '\r' | '\n' | '\t']+) / comment()}* / expected!("<whitespace>")5354 55 rule comma() = quiet!{_ "," _} / expected!("<comma>")56 rule alpha() -> char = c:$(['_' | 'a'..='z' | 'A'..='Z']) {c.chars().next().unwrap()}57 rule digit() -> char = d:$(['0'..='9']) {d.chars().next().unwrap()}58 rule end_of_ident() = !['0'..='9' | '_' | 'a'..='z' | 'A'..='Z']59 60 rule uint_str() -> &'input str = a:$(digit()+ ("_" digit()+)*) { a }61 62 rule number() -> f64 = quiet!{a:$(uint_str() ("." uint_str())? (['e'|'E'] (s:['+'|'-'])? uint_str())?) {? a.replace("_","").parse().map_err(|_| "<number>") }} / expected!("<number>")6364 65 rule reserved() = ("assert" / "else" / "error" / "false" / "for" / "function" / "if" / "import" / "importstr" / "importbin" / "in" / "local" / "null" / "tailstrict" / "then" / "self" / "super" / "true") end_of_ident()66 rule id() -> IStr = v:$(quiet!{ !reserved() alpha() (alpha() / digit())*} / expected!("<identifier>")) { v.into() }6768 rule keyword(id: &'static str) -> ()69 = ##parse_string_literal(id) end_of_ident()7071 pub rule param(s: &ParserSettings) -> expr::Param = name:destruct(s) expr:(_ "=" _ expr:expr(s){expr})? { expr::Param(name, expr.map(Rc::new)) }72 pub rule params(s: &ParserSettings) -> expr::ParamsDesc73 = params:param(s) ** comma() comma()? { expr::ParamsDesc(Rc::new(params)) }74 / { expr::ParamsDesc(Rc::new(Vec::new())) }7576 pub rule arg(s: &ParserSettings) -> (Option<IStr>, Rc<Spanned<Expr>>)77 = name:(quiet! { (s:id() _ "=" !['='] _ {s})? } / expected!("<argument name>")) expr:expr(s) {(name, Rc::new(expr))}7879 pub rule args(s: &ParserSettings) -> expr::ArgsDesc80 = args:arg(s)**comma() comma()? {?81 let unnamed_count = args.iter().take_while(|(n, _)| n.is_none()).count();82 let mut unnamed = Vec::with_capacity(unnamed_count);83 let mut named = Vec::with_capacity(args.len() - unnamed_count);84 let mut named_started = false;85 for (name, value) in args {86 if let Some(name) = name {87 named_started = true;88 named.push((name, value));89 } else {90 if named_started {91 return Err("<named argument>")92 }93 unnamed.push(value);94 }95 }96 Ok(expr::ArgsDesc::new(unnamed, named))97 }9899 pub rule destruct_rest() -> expr::DestructRest100 = "..." into:(_ into:id() {into})? {if let Some(into) = into {101 expr::DestructRest::Keep(into)102 } else {expr::DestructRest::Drop}}103 pub rule destruct_array(s: &ParserSettings) -> expr::Destruct104 = "[" _ start:destruct(s)**comma() rest:(105 comma() _ rest:destruct_rest()? end:(106 comma() end:destruct(s)**comma() (_ comma())? {end}107 / comma()? {Vec::new()}108 ) {(rest, end)}109 / comma()? {(None, Vec::new())}110 ) _ "]" {?111 #[cfg(feature = "exp-destruct")] return Ok(expr::Destruct::Array {112 start,113 rest: rest.0,114 end: rest.1,115 });116 #[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")117 }118 pub rule destruct_object(s: &ParserSettings) -> expr::Destruct119 = "{" _120 fields:(name:id() into:(_ ":" _ into:destruct(s) {into})? default:(_ "=" _ v:expr(s) {v})? {(name, into, default)})**comma()121 rest:(122 comma() rest:destruct_rest()? {rest}123 / comma()? {None}124 )125 _ "}" {?126 #[cfg(feature = "exp-destruct")] return Ok(expr::Destruct::Object {127 fields,128 rest,129 });130 #[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")131 }132 pub rule destruct(s: &ParserSettings) -> expr::Destruct133 = v:id() {expr::Destruct::Full(v)}134 / "?" {?135 #[cfg(feature = "exp-destruct")] return Ok(expr::Destruct::Skip);136 #[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")137 }138 / arr:destruct_array(s) {arr}139 / obj:destruct_object(s) {obj}140141 pub rule bind(s: &ParserSettings) -> expr::BindSpec142 = into:destruct(s) _ "=" _ expr:expr(s) {expr::BindSpec::Field{into, value: Rc::new(expr)}}143 / name:id() _ "(" _ params:params(s) _ ")" _ "=" _ expr:expr(s) {expr::BindSpec::Function{name, params, value: Rc::new(expr)}}144145 pub rule assertion(s: &ParserSettings) -> expr::AssertStmt146 = keyword("assert") _ cond:expr(s) msg:(_ ":" _ e:expr(s) {e})? { expr::AssertStmt(cond, msg) }147148 pub rule whole_line() -> &'input str149 = str:$((!['\n'][_])* "\n") {str}150 pub rule string_block() -> String151 = "|||" chomped:"-"? (!['\n']single_whitespace())* "\n"152 empty_lines:$(['\n']*)153 prefix:[' ' | '\t']+ first_line:whole_line()154 lines:("\n" {"\n"} / [' ' | '\t']*<{prefix.len()}> s:whole_line() {s})*155 [' ' | '\t']*<, {prefix.len() - 1}> "|||"156 {157 let mut l = empty_lines.to_owned();158 l.push_str(first_line);159 l.extend(lines);160 if chomped.is_some() {161 debug_assert!(l.ends_with('\n'));162 l.truncate(l.len() - 1);163 }164 l165 }166167 rule hex_char()168 = quiet! { ['0'..='9' | 'a'..='f' | 'A'..='F'] } / expected!("<hex char>")169170 rule string_char(c: rule<()>)171 = (!['\\']!c()[_])+172 / "\\\\"173 / "\\u" hex_char() hex_char() hex_char() hex_char()174 / "\\x" hex_char() hex_char()175 / ['\\'] (quiet! { ['b' | 'f' | 'n' | 'r' | 't' | '"' | '\''] } / expected!("<escape character>"))176 pub rule string() -> String177 = ['"'] str:$(string_char(<"\"">)*) ['"'] {? unescape::unescape(str).ok_or("<escaped string>")}178 / ['\''] str:$(string_char(<"\'">)*) ['\''] {? unescape::unescape(str).ok_or("<escaped string>")}179 / quiet!{ "@'" str:$(("''" / (!['\''][_]))*) "'" {str.replace("''", "'")}180 / "@\"" str:$(("\"\"" / (!['"'][_]))*) "\"" {str.replace("\"\"", "\"")}181 / string_block() } / expected!("<string>")182183 pub rule field_name(s: &ParserSettings) -> expr::FieldName184 = name:id() {expr::FieldName::Fixed(name)}185 / name:string() {expr::FieldName::Fixed(name.into())}186 / "[" _ expr:expr(s) _ "]" {expr::FieldName::Dyn(expr)}187 pub rule visibility() -> expr::Visibility188 = ":::" {expr::Visibility::Unhide}189 / "::" {expr::Visibility::Hidden}190 / ":" {expr::Visibility::Normal}191 pub rule field(s: &ParserSettings) -> expr::FieldMember192 = name:field_name(s) _ plus:"+"? _ visibility:visibility() _ value:expr(s) {expr::FieldMember{193 name,194 plus: plus.is_some(),195 params: None,196 visibility,197 value: Rc::new(value),198 }}199 / name:field_name(s) _ "(" _ params:params(s) _ ")" _ visibility:visibility() _ value:expr(s) {expr::FieldMember{200 name,201 plus: false,202 params: Some(params),203 visibility,204 value: Rc::new(value),205 }}206 pub rule obj_local(s: &ParserSettings) -> BindSpec207 = keyword("local") _ bind:bind(s) {bind}208 pub rule member(s: &ParserSettings) -> expr::Member209 = bind:obj_local(s) {expr::Member::BindStmt(bind)}210 / assertion:assertion(s) {expr::Member::AssertStmt(Rc::new(assertion))}211 / field:field(s) {expr::Member::Field(field)}212 pub rule objinside(s: &ParserSettings) -> expr::ObjBody213 = pre_locals:(b: obj_local(s) comma() {b})* &"[" field:field(s) post_locals:(comma() b:obj_local(s) {b})* _ ("," _)? forspec:forspec(s) others:(_ rest:compspec(s) {rest})? {214 let mut compspecs = vec![CompSpec::ForSpec(forspec)];215 compspecs.extend(others.unwrap_or_default());216 expr::ObjBody::ObjComp(expr::ObjComp{217 pre_locals,218 field: Rc::new(field),219 post_locals,220 compspecs,221 })222 }223 / members:(member(s) ** comma()) comma()? {expr::ObjBody::MemberList(members)}224 pub rule ifspec(s: &ParserSettings) -> IfSpecData225 = keyword("if") _ expr:expr(s) {IfSpecData(expr)}226 pub rule forspec(s: &ParserSettings) -> ForSpecData227 = keyword("for") _ id:destruct(s) _ keyword("in") _ cond:expr(s) {ForSpecData(id, cond)}228 pub rule compspec(s: &ParserSettings) -> Vec<expr::CompSpec>229 = s:(i:ifspec(s) { expr::CompSpec::IfSpec(i) } / f:forspec(s) {expr::CompSpec::ForSpec(f)} ) ** _ {s}230 pub rule local_expr(s: &ParserSettings) -> Expr231 = keyword("local") _ binds:bind(s) ** comma() (_ ",")? _ ";" _ expr:expr(s) { Expr::LocalExpr(binds, Box::new(expr)) }232 pub rule string_expr(s: &ParserSettings) -> Expr233 = s:string() {Expr::Str(s.into())}234 pub rule obj_expr(s: &ParserSettings) -> Expr235 = "{" _ body:objinside(s) _ "}" {Expr::Obj(body)}236 pub rule array_expr(s: &ParserSettings) -> Expr237 = "[" _ elems:(expr(s) ** comma()) _ comma()? "]" {Expr::Arr(Rc::new(elems))}238 pub rule array_comp_expr(s: &ParserSettings) -> Expr239 = "[" _ expr:expr(s) _ comma()? _ forspec:forspec(s) _ others:(others: compspec(s) _ {others})? "]" {240 let mut specs = vec![CompSpec::ForSpec(forspec)];241 specs.extend(others.unwrap_or_default());242 Expr::ArrComp(Rc::new(expr), specs)243 }244 pub rule number_expr(s: &ParserSettings) -> Expr245 = n:number() {? if n.is_finite() {246 Ok(expr::Expr::Num(n))247 } else {248 Err("!!!numbers are finite")249 }}250 pub rule var_expr(s: &ParserSettings) -> Expr251 = n:id() { expr::Expr::Var(n) }252 pub rule id_loc(s: &ParserSettings) -> Spanned<Expr>253 = a:position!() n:id() b:position!() { Spanned::new(expr::Expr::Str(n), Span(s.source.clone(), a as u32,b as u32)) }254 pub rule if_then_else_expr(s: &ParserSettings) -> Expr255 = cond:ifspec(s) _ keyword("then") _ cond_then:expr(s) cond_else:(_ keyword("else") _ e:expr(s) {e})? {Expr::IfElse(Box::new(IfElse{256 cond,257 cond_then,258 cond_else,259 }))}260261 pub rule literal(s: &ParserSettings) -> Expr262 = v:(263 keyword("null") {LiteralType::Null}264 / keyword("true") {LiteralType::True}265 / keyword("false") {LiteralType::False}266 / keyword("self") {LiteralType::This}267 / keyword("$") {LiteralType::Dollar}268 / keyword("super") {LiteralType::Super}269 ) {Expr::Literal(v)}270271 rule import_kind() -> ImportKind272 = keyword("importstr") { ImportKind::Str }273 / keyword("importbin") { ImportKind::Bin }274 / keyword("import") { ImportKind::Normal }275276 pub rule expr_basic(s: &ParserSettings) -> Expr277 = literal(s)278279 / string_expr(s) / number_expr(s)280 / array_expr(s)281 / obj_expr(s)282 / array_expr(s)283 / array_comp_expr(s)284285 / kind:import_kind() _ path:expr(s) {Expr::Import(kind, Box::new(path))}286287 / var_expr(s)288 / local_expr(s)289 / if_then_else_expr(s)290291 / keyword("function") _ "(" _ params:params(s) _ ")" _ expr:expr(s) {Expr::Function(params, Rc::new(expr))}292 / assert:assertion(s) _ ";" _ rest:expr(s) { Expr::AssertExpr(Rc::new(AssertExpr{293 assert, rest294 })) }295296 / keyword("error") _ expr:expr(s) { Expr::ErrorStmt(Box::new(expr)) }297298 rule slice_part(s: &ParserSettings) -> Option<Spanned<Expr>>299 = _ e:(e:expr(s) _{e})? {e}300 pub rule slice_desc(s: &ParserSettings) -> SliceDesc301 = start:slice_part(s) ":" pair:(end:slice_part(s) step:(":" e:slice_part(s){e})? {(end, step.flatten())})? {302 let (end, step) = if let Some((end, step)) = pair {303 (end, step)304 }else{305 (None, None)306 };307308 SliceDesc { start, end, step }309 }310311 rule binop(x: rule<()>) -> ()312 = quiet!{ x() } / expected!("<binary op>")313 rule unaryop(x: rule<()>) -> ()314 = quiet!{ x() } / expected!("<unary op>")315316 rule ensure_null_coaelse()317 = "" {?318 #[cfg(not(feature = "exp-null-coaelse"))] return Err("!!!experimental null coaelscing was not enabled");319 #[cfg(feature = "exp-null-coaelse")] Ok(())320 }321 use BinaryOpType::*;322 use UnaryOpType::*;323 rule expr(s: &ParserSettings) -> Spanned<Expr>324 = precedence! {325 "(" _ e:expr(s) _ ")" {e}326 start:position!() v:@ end:position!() { Spanned::new(v, Span(s.source.clone(), start as u32, end as u32)) }327 --328 a:(@) _ binop(<"||">) _ b:@ {expr_bin!(a Or b)}329 a:(@) _ binop(<"??">) _ ensure_null_coaelse() b:@ {330 #[cfg(feature = "exp-null-coaelse")] return expr_bin!(a NullCoaelse b);331 unreachable!("ensure_null_coaelse will fail if feature is not enabled")332 }333 --334 a:(@) _ binop(<"&&">) _ b:@ {expr_bin!(a And b)}335 --336 a:(@) _ binop(<"|">) _ b:@ {expr_bin!(a BitOr b)}337 --338 a:@ _ binop(<"^">) _ b:(@) {expr_bin!(a BitXor b)}339 --340 a:(@) _ binop(<"&">) _ b:@ {expr_bin!(a BitAnd b)}341 --342 a:(@) _ binop(<"==">) _ b:@ {expr_bin!(a Eq b)}343 a:(@) _ binop(<"!=">) _ b:@ {expr_bin!(a Neq b)}344 --345 a:(@) _ binop(<"<">) _ b:@ {expr_bin!(a Lt b)}346 a:(@) _ binop(<">">) _ b:@ {expr_bin!(a Gt b)}347 a:(@) _ binop(<"<=">) _ b:@ {expr_bin!(a Lte b)}348 a:(@) _ binop(<">=">) _ b:@ {expr_bin!(a Gte b)}349 a:(@) _ binop(<keyword("in")>) _ b:@ {expr_bin!(a In b)}350 --351 a:(@) _ binop(<"<<">) _ b:@ {expr_bin!(a Lhs b)}352 a:(@) _ binop(<">>">) _ b:@ {expr_bin!(a Rhs b)}353 --354 a:(@) _ binop(<"+">) _ b:@ {expr_bin!(a Add b)}355 a:(@) _ binop(<"-">) _ b:@ {expr_bin!(a Sub b)}356 --357 a:(@) _ binop(<"*">) _ b:@ {expr_bin!(a Mul b)}358 a:(@) _ binop(<"/">) _ b:@ {expr_bin!(a Div b)}359 a:(@) _ binop(<"%">) _ b:@ {expr_bin!(a Mod b)}360 --361 unaryop(<"+">) _ b:@ {expr_un!(Plus b)}362 unaryop(<"-">) _ b:@ {expr_un!(Minus b)}363 unaryop(<"!">) _ b:@ {expr_un!(Not b)}364 unaryop(<"~">) _ b:@ {expr_un!(BitNot b)}365 --366 value:(@) _ "[" _ slice:slice_desc(s) _ "]" {Expr::Slice(Box::new(Slice{value, slice}))}367 indexable:(@) _ parts:index_part(s)+ {Expr::Index{indexable: Box::new(indexable), parts}}368 a:(@) _ "(" _ args:args(s) _ ")" ts:(_ keyword("tailstrict"))? {Expr::Apply(Box::new(a), args, ts.is_some())}369 a:(@) _ "{" _ body:objinside(s) _ "}" {Expr::ObjExtend(Rc::new(a), body)}370 --371 e:expr_basic(s) {e}372 }373 pub rule index_part(s: &ParserSettings) -> IndexPart374 = n:("?" _ ensure_null_coaelse())? "." _ value:id_loc(s) {IndexPart {375 value,376 #[cfg(feature = "exp-null-coaelse")]377 null_coaelse: n.is_some(),378 }}379 / n:("?" _ "." _ ensure_null_coaelse())? "[" _ value:expr(s) _ "]" {IndexPart {380 value,381 #[cfg(feature = "exp-null-coaelse")]382 null_coaelse: n.is_some(),383 }}384385 pub rule jsonnet(s: &ParserSettings) -> Spanned<Expr> = _ e:expr(s) _ {e}386 }387}388389pub type ParseError = peg::error::ParseError<peg::str::LineCol>;390pub fn parse(str: &str, settings: &ParserSettings) -> Result<Spanned<Expr>, ParseError> {391 jsonnet_parser::jsonnet(str, settings)392}393394pub fn string_to_expr(str: IStr, settings: &ParserSettings) -> Spanned<Expr> {395 let len = str.len();396 Spanned::new(Expr::Str(str), Span(settings.source.clone(), 0, len as u32))397}398399#[cfg(test)]400pub mod tests {401 use insta::assert_snapshot;402 use jrsonnet_interner::IStr;403404 use super::parse;405 use crate::{source::Source, ParserSettings};406407 fn parsep(s: &str) -> String {408 let v = parse(409 s,410 &ParserSettings {411 source: Source::new_virtual("<test>".into(), IStr::empty()),412 },413 )414 .unwrap();415 format!("{v:#?}")416 }417418 macro_rules! parse {419 ($s:expr) => {420 assert_snapshot!(parsep($s));421 };422 }423424 #[test]425 fn multiline_string() {426 parse!("|||\n Hello world!\n a\n|||");427 parse!("|||\n Hello world!\n a\n|||");428 parse!("|||\n\t\tHello world!\n\t\t\ta\n|||");429 parse!("|||\n Hello world!\n a\n |||");430 }431432 #[test]433 fn slice() {434 parse!("a[1:]");435 parse!("a[1::]");436 parse!("a[:1:]");437 parse!("a[::1]");438 parse!("str[:len - 1]");439 }440441 #[test]442 fn string_escaping() {443 parse!(r#""Hello, \"world\"!""#);444 parse!(r#"'Hello \'world\'!'"#);445 parse!(r#"'\\\\'"#);446 }447448 #[test]449 fn string_unescaping() {450 parse!(r#""Hello\nWorld""#);451 }452453 #[test]454 fn string_verbantim() {455 parse!(r#"@"Hello\n""World""""#);456 }457458 #[test]459 fn imports() {460 parse!("import \"hello\"");461 parse!("importstr \"garnish.txt\"");462 parse!("importbin \"garnish.bin\"");463 }464465 #[test]466 fn empty_object() {467 parse!("{}");468 }469470 #[test]471 fn basic_math() {472 parse!("2+2*2");473 parse!("2 + 2 * 2 ");474 parse!("2+(2+2*2)");475 parse!("2//comment\n+//comment\n3/*test*/*/*test*/4");476 }477478 #[test]479 fn suffix() {480 parse!("std.test");481 parse!("std(2)");482 parse!("std.test(2)");483 parse!("a[b]");484 }485486 #[test]487 fn array_comp() {488 parse!("[std.deepJoin(x) for x in arr]");489 }490491 #[test]492 fn reserved() {493 parse!("null");494 parse!("nulla");495 }496497 #[test]498 fn multiple_args_buf() {499 parse!("a(b, null_fields)");500 }501502 #[test]503 fn infix_precedence() {504 parse!("!a && !b");505 parse!("!a / !b");506 }507508 #[test]509 fn double_negation() {510 parse!("!!a");511 }512513 #[test]514 fn array_test_error() {515 parse!("[a for a in b if c for e in f]");516 }517518 #[test]519 fn missing_newline_between_comment_and_eof() {520 parse!(521 "{a:1}522523 //+213"524 );525 }526527 #[test]528 fn default_param_before_nondefault() {529 parse!("local x(foo = 'foo', bar) = null; null");530 }531532 #[test]533 fn add_location_info_to_all_sub_expressions() {534 parse!("{} { local x = 1, x: x } + {}");535 }536}