1use std::rc::Rc;23use jrsonnet_gcmodule::Acyclic;4use jrsonnet_ir::{5 ArgsDesc, AssertExpr, AssertStmt, BinaryOp, BindSpec, CompSpec, Destruct, DestructRest, Expr,6 ExprParam, ExprParams, FieldMember, FieldName, ForSpecData, IStr, IfElse, IfSpecData,7 ImportKind, IndexPart, LiteralType, Member, NumValue, ObjBody, ObjComp, ObjMembers, Slice,8 SliceDesc, Source, Span, Spanned, Visibility, unescape,9};10use peg::parser;1112pub struct ParserSettings {13 pub source: Source,14}1516macro_rules! expr_bin {17 ($a:ident $op:ident $b:ident) => {18 Expr::BinaryOp(Box::new(BinaryOp {19 lhs: $a,20 op: $op,21 rhs: $b,22 }))23 };24}25macro_rules! expr_un {26 ($op:ident $a:ident) => {27 Expr::UnaryOp($op, Box::new($a))28 };29}3031parser! {32 grammar jsonnet_parser() for str {33 use peg::ParseLiteral;3435 rule eof() = quiet!{![_]} / expected!("<eof>")36 rule eol() = "\n" / eof()3738 39 rule comment()40 = "//" (!eol()[_])* eol()41 / "/*" (!("*/")[_])* "*/"42 / "#" (!eol()[_])* eol()4344 rule single_whitespace() = quiet!{([' ' | '\r' | '\n' | '\t'] / comment())} / expected!("<whitespace>")45 rule _() = quiet!{([' ' | '\r' | '\n' | '\t']+) / comment()}* / expected!("<whitespace>")4647 48 rule comma() = quiet!{_ "," _} / expected!("<comma>")49 rule alpha() -> char = c:$(['_' | 'a'..='z' | 'A'..='Z']) {c.chars().next().unwrap()}50 rule digit() -> char = d:$(['0'..='9']) {d.chars().next().unwrap()}51 rule end_of_ident() = !['0'..='9' | '_' | 'a'..='z' | 'A'..='Z']52 53 rule uint_str() -> &'input str = a:$(digit()+ ("_" digit()+)*) { a }54 55 rule number() -> f64 = quiet!{a:$(uint_str() ("." uint_str())? (['e'|'E'] (s:['+'|'-'])? uint_str())?) {? a.replace('_',"").parse().map_err(|_| "<number>") }} / expected!("<number>")5657 58 rule reserved() = ("assert" / "else" / "error" / "false" / "for" / "function" / "if" / "import" / "importstr" / "importbin" / "in" / "local" / "null" / "tailstrict" / "then" / "self" / "super" / "true") end_of_ident()59 rule id() -> IStr = v:$(quiet!{ !reserved() alpha() (alpha() / digit())*} / expected!("<identifier>")) { v.into() }6061 rule keyword(id: &'static str) -> ()62 = #parse_string_literal(id) end_of_ident()6364 pub rule param(s: &ParserSettings) -> ExprParam = destruct:destruct(s) expr:(_ "=" _ expr:expr(s){expr})? { ExprParam { destruct, default: expr.map(Rc::new) } }65 pub rule params(s: &ParserSettings) -> ExprParams66 = params:param(s) ** comma() comma()? { ExprParams::new(params) }67 / { ExprParams::new(Vec::new()) }6869 pub rule arg(s: &ParserSettings) -> (Option<IStr>, Rc<Expr>)70 = name:(quiet! { (s:id() _ "=" !['='] _ {s})? } / expected!("<argument name>")) expr:expr(s) {(name, Rc::new(expr))}7172 pub rule args(s: &ParserSettings) -> ArgsDesc73 = args:arg(s)**comma() comma()? {?74 let unnamed_count = args.iter().take_while(|(n, _)| n.is_none()).count();75 let mut unnamed = Vec::with_capacity(unnamed_count);76 let mut names = Vec::with_capacity(args.len() - unnamed_count);77 let mut values = Vec::with_capacity(args.len() - unnamed_count);78 let mut named_started = false;79 for (name, value) in args {80 if let Some(name) = name {81 named_started = true;82 names.push(name);83 values.push(value);84 } else {85 if named_started {86 return Err("<named argument>")87 }88 unnamed.push(value);89 }90 }91 Ok(ArgsDesc{unnamed, names, values})92 }9394 pub rule destruct_rest() -> DestructRest95 = "..." into:(_ into:id() {into})? {if let Some(into) = into {96 DestructRest::Keep(into)97 } else {DestructRest::Drop}}98 pub rule destruct_array(s: &ParserSettings) -> Destruct99 = "[" _ start:destruct(s)**comma() rest:(100 comma() _ rest:destruct_rest()? end:(101 comma() end:destruct(s)**comma() (_ comma())? {end}102 / comma()? {Vec::new()}103 ) {(rest, end)}104 / comma()? {(None, Vec::new())}105 ) _ "]" {?106 #[cfg(feature = "exp-destruct")] return Ok(Destruct::Array {107 start,108 rest: rest.0,109 end: rest.1,110 });111 #[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")112 }113 pub rule destruct_object(s: &ParserSettings) -> Destruct114 = "{" _115 fields:(name:id() into:(_ ":" _ into:destruct(s) {into})? default:(_ "=" _ v:spanned(<expr(s)>, s) {v})? {(name, into, default.map(Rc::new))})**comma()116 rest:(117 comma() rest:destruct_rest()? {rest}118 / comma()? {None}119 )120 _ "}" {?121 #[cfg(feature = "exp-destruct")] return Ok(Destruct::Object {122 fields,123 rest,124 });125 #[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")126 }127 pub rule destruct(s: &ParserSettings) -> Destruct128 = v:id() {Destruct::Full(v)}129 / "?" {?130 #[cfg(feature = "exp-destruct")] return Ok(Destruct::Skip);131 #[cfg(not(feature = "exp-destruct"))] Err("!!!experimental destructuring was not enabled")132 }133 / arr:destruct_array(s) {arr}134 / obj:destruct_object(s) {obj}135136 pub rule bind(s: &ParserSettings) -> BindSpec137 = into:destruct(s) _ "=" _ value:expr(s) {BindSpec::Field{into, value: Rc::new(value)}}138 / name:id() _ "(" _ params:params(s) _ ")" _ "=" _ value:expr(s) {BindSpec::Function{name, params, value: Rc::new(value)}}139140 pub rule assertion(s: &ParserSettings) -> AssertStmt141 = keyword("assert") _ assertion:spanned(<expr(s)>, s) message:(_ ":" _ e:expr(s) {e})? { AssertStmt{assertion, message} }142143 pub rule whole_line() -> &'input str144 = str:$((!['\n'][_])* "\n") {str}145 pub rule string_block() -> String146 = "|||" chomped:"-"? (!['\n']single_whitespace())* "\n"147 empty_lines:$(['\n']*)148 prefix:[' ' | '\t']+ first_line:whole_line()149 lines:("\n" {"\n"} / [' ' | '\t']*<{prefix.len()}> s:whole_line() {s})*150 [' ' | '\t']*<, {prefix.len() - 1}> "|||"151 {152 let mut l = empty_lines.to_owned();153 l.push_str(first_line);154 l.extend(lines);155 if chomped.is_some() {156 debug_assert!(l.ends_with('\n'));157 l.truncate(l.len() - 1);158 }159 l160 }161162 rule hex_char()163 = quiet! { ['0'..='9' | 'a'..='f' | 'A'..='F'] } / expected!("<hex char>")164165 rule string_char(c: rule<()>)166 = (!['\\']!c()[_])+167 / "\\\\"168 / "\\u" hex_char() hex_char() hex_char() hex_char()169 / "\\x" hex_char() hex_char()170 / ['\\'] (quiet! { ['b' | 'f' | 'n' | 'r' | 't' | '"' | '\''] } / expected!("<escape character>"))171 pub rule string() -> String172 = ['"'] str:$(string_char(<"\"">)*) ['"'] {? unescape::unescape(str).ok_or("<escaped string>")}173 / ['\''] str:$(string_char(<"\'">)*) ['\''] {? unescape::unescape(str).ok_or("<escaped string>")}174 / quiet!{ "@'" str:$(("''" / (!['\''][_]))*) "'" {str.replace("''", "'")}175 / "@\"" str:$(("\"\"" / (!['"'][_]))*) "\"" {str.replace("\"\"", "\"")}176 / string_block() } / expected!("<string>")177178 pub rule field_name(s: &ParserSettings) -> FieldName179 = name:id() {FieldName::Fixed(name)}180 / name:string() {FieldName::Fixed(name.into())}181 / "[" _ expr:expr(s) _ "]" {FieldName::Dyn(expr)}182 pub rule visibility() -> Visibility183 = ":::" {Visibility::Unhide}184 / "::" {Visibility::Hidden}185 / ":" {Visibility::Normal}186 pub rule field(s: &ParserSettings) -> FieldMember187 = name:spanned(<field_name(s)>, s) _ plus:"+"? _ visibility:visibility() _ value:expr(s) {FieldMember{188 name,189 plus: plus.is_some(),190 params: None,191 visibility,192 value: Rc::new(value),193 }}194 / name:spanned(<field_name(s)>, s) _ "(" _ params:params(s) _ ")" _ visibility:visibility() _ value:expr(s) {FieldMember{195 name,196 plus: false,197 params: Some(params),198 visibility,199 value: Rc::new(value),200 }}201 pub rule obj_local(s: &ParserSettings) -> BindSpec202 = keyword("local") _ bind:bind(s) {bind}203 pub rule member(s: &ParserSettings) -> Member204 = bind:obj_local(s) {Member::BindStmt(bind)}205 / assertion:assertion(s) {Member::AssertStmt(assertion)}206 / field:field(s) {Member::Field(field)}207 pub rule objinside(s: &ParserSettings) -> ObjBody208 = members:(member(s) ** comma()) comma()? _ compspecs:compspecs(s)? {?209 Ok(if let Some(compspecs) = compspecs {210 let mut locals = Vec::new();211 let mut field = None;212 for member in members {213 match member {214 Member::Field(field_member) => if field.replace(field_member).is_some() {215 return Err("<object comprehension can only contain one field>")216 },217 Member::BindStmt(bind_spec) => locals.push(bind_spec),218 Member::AssertStmt(assert_stmt) => return Err("<asserts are unsupported in object comprehension>"),219 }220 }221 ObjBody::ObjComp(ObjComp {222 locals: Rc::new(locals),223 field: field.map(Rc::new).ok_or("<missing object comprehension field>")?,224 compspecs225 })226 } else {227 let mut locals = Vec::new();228 let mut asserts = Vec::new();229 let mut fields = Vec::new();230 for member in members {231 match member {232 Member::Field(field_member) => fields.push(field_member),233 Member::BindStmt(bind_spec) => locals.push(bind_spec),234 Member::AssertStmt(assert_stmt) => asserts.push(assert_stmt),235 }236 }237 ObjBody::MemberList(ObjMembers {238 locals: Rc::new(locals),239 asserts: Rc::new(asserts),240 fields241 })242 })243 }244 pub rule ifspec(s: &ParserSettings) -> IfSpecData245 = i:spanned(<keyword("if")>, s) _ cond:expr(s) {IfSpecData { span: i.span, cond }}246 pub rule forspec(s: &ParserSettings) -> ForSpecData247 = keyword("for") _ destruct:destruct(s) _ keyword("in") _ over:expr(s) { ForSpecData { destruct, over } }248 rule compspec(s: &ParserSettings) -> CompSpec249 = i:ifspec(s) { CompSpec::IfSpec(i) } / f:forspec(s) {CompSpec::ForSpec(f)}250 pub rule compspecs(s: &ParserSettings) -> Vec<CompSpec>251 = specs:compspec(s) ++ _ {?252 if !matches!(specs[0], CompSpec::ForSpec(_)) {253 return Err("<first compspec should be for>")254 }255 Ok(specs)256 }257 pub rule local_expr(s: &ParserSettings) -> Expr258 = keyword("local") _ binds:bind(s) ** comma() (_ ",")? _ ";" _ expr:expr(s) { Expr::LocalExpr(binds, Box::new(expr)) }259 pub rule string_expr(s: &ParserSettings) -> Expr260 = s:string() {Expr::Str(s.into())}261 pub rule obj_expr(s: &ParserSettings) -> Expr262 = "{" _ body:objinside(s) _ "}" {Expr::Obj(body)}263 pub rule array_expr(s: &ParserSettings) -> Expr264 = "[" _ elems:(expr(s) ** comma()) _ comma()? "]" {Expr::Arr(Rc::new(elems))}265 pub rule array_comp_expr(s: &ParserSettings) -> Expr266 = "[" _ expr:expr(s) _ comma()? _ specs:(r: compspecs(s) _ {r}) "]" {267 Expr::ArrComp(Rc::new(expr), specs)268 }269 pub rule number_expr(s: &ParserSettings) -> Expr270 = n:number() {? if let Some(n) = NumValue::new(n) {271 Ok(Expr::Num(n))272 } else {273 Err("!!!numbers are finite")274 }}275276 rule spanned<T: Acyclic>(x: rule<T>, s: &ParserSettings) -> Spanned<T>277 = a:position!() n:x() b:position!() { Spanned::new(n, Span(s.source.clone(), a as u32, b as u32)) }278279 pub rule var_expr(s: &ParserSettings) -> Expr280 = n:spanned(<id()>, s) { Expr::Var(n) }281 pub rule id_loc(s: &ParserSettings) -> Spanned<Expr>282 = a:position!() n:id() b:position!() { Spanned::new(Expr::Str(n), Span(s.source.clone(), a as u32,b as u32)) }283 pub rule if_then_else_expr(s: &ParserSettings) -> Expr284 = cond:ifspec(s) _ keyword("then") _ cond_then:expr(s) cond_else:(_ keyword("else") _ e:expr(s) {e})? {Expr::IfElse(Box::new(IfElse{285 cond,286 cond_then,287 cond_else,288 }))}289290 pub rule literal(s: &ParserSettings) -> Expr291 = v:(292 keyword("null") {LiteralType::Null}293 / keyword("true") {LiteralType::True}294 / keyword("false") {LiteralType::False}295 / keyword("self") {LiteralType::This}296 / keyword("$") {LiteralType::Dollar}297 / keyword("super") {LiteralType::Super}298 ) {Expr::Literal(v)}299300 rule import_kind() -> ImportKind301 = keyword("importstr") { ImportKind::Str }302 / keyword("importbin") { ImportKind::Bin }303 / keyword("import") { ImportKind::Normal }304305 pub rule expr_basic(s: &ParserSettings) -> Expr306 = literal(s)307308 / string_expr(s) / number_expr(s)309 / array_expr(s)310 / obj_expr(s)311 / array_expr(s)312 / array_comp_expr(s)313314 / kind:spanned(<import_kind()>, s) _ path:expr(s) {Expr::Import(kind, Box::new(path))}315316 / var_expr(s)317 / local_expr(s)318 / if_then_else_expr(s)319320 / keyword("function") _ "(" _ params:params(s) _ ")" _ expr:expr(s) {Expr::Function(params, Rc::new(expr))}321 / assert:assertion(s) _ ";" _ rest:expr(s) { Expr::AssertExpr(Rc::new(AssertExpr{322 assert, rest323 })) }324325 / err_kw:spanned(<keyword("error")>, s) _ expr:expr(s) { Expr::ErrorStmt(err_kw.span, Box::new(expr)) }326327 rule slice_part(s: &ParserSettings) -> Option<Spanned<Expr>>328 = _ e:(e:spanned(<expr(s)>, s) _{e})? {e}329 pub rule slice_desc(s: &ParserSettings) -> SliceDesc330 = start:slice_part(s) ":" pair:(end:slice_part(s) step:(":" e:slice_part(s){e})? {(end, step.flatten())})? {331 let (end, step) = if let Some((end, step)) = pair {332 (end, step)333 }else{334 (None, None)335 };336337 SliceDesc { start, end, step }338 }339340 rule binop(x: rule<()>) -> ()341 = quiet!{ x() } / expected!("<binary op>")342 rule unaryop(x: rule<()>) -> ()343 = quiet!{ x() } / expected!("<unary op>")344345 rule ensure_null_coaelse()346 = "" {?347 #[cfg(not(feature = "exp-null-coaelse"))] return Err("!!!experimental null coaelscing was not enabled");348 #[cfg(feature = "exp-null-coaelse")] Ok(())349 }350 use jrsonnet_ir::BinaryOpType::*;351 use jrsonnet_ir::UnaryOpType::*;352 rule expr(s: &ParserSettings) -> Expr353 = precedence! {354 a:(@) _ binop(<"||">) _ b:@ {expr_bin!(a Or b)}355 a:(@) _ binop(<"??">) _ ensure_null_coaelse() b:@ {356 #[cfg(feature = "exp-null-coaelse")] return expr_bin!(a NullCoaelse b);357 unreachable!("ensure_null_coaelse will fail if feature is not enabled")358 }359 --360 a:(@) _ binop(<"&&">) _ b:@ {expr_bin!(a And b)}361 --362 a:(@) _ binop(<"|">) _ b:@ {expr_bin!(a BitOr b)}363 --364 a:@ _ binop(<"^">) _ b:(@) {expr_bin!(a BitXor b)}365 --366 a:(@) _ binop(<"&">) _ b:@ {expr_bin!(a BitAnd b)}367 --368 a:(@) _ binop(<"==">) _ b:@ {expr_bin!(a Eq b)}369 a:(@) _ binop(<"!=">) _ b:@ {expr_bin!(a Neq b)}370 --371 a:(@) _ binop(<"<">) _ b:@ {expr_bin!(a Lt b)}372 a:(@) _ binop(<">">) _ b:@ {expr_bin!(a Gt b)}373 a:(@) _ binop(<"<=">) _ b:@ {expr_bin!(a Lte b)}374 a:(@) _ binop(<">=">) _ b:@ {expr_bin!(a Gte b)}375 a:(@) _ binop(<keyword("in")>) _ b:@ {expr_bin!(a In b)}376 --377 a:(@) _ binop(<"<<">) _ b:@ {expr_bin!(a Lhs b)}378 a:(@) _ binop(<">>">) _ b:@ {expr_bin!(a Rhs b)}379 --380 a:(@) _ binop(<"+">) _ b:@ {expr_bin!(a Add b)}381 a:(@) _ binop(<"-">) _ b:@ {expr_bin!(a Sub b)}382 --383 a:(@) _ binop(<"*">) _ b:@ {expr_bin!(a Mul b)}384 a:(@) _ binop(<"/">) _ b:@ {expr_bin!(a Div b)}385 a:(@) _ binop(<"%">) _ b:@ {expr_bin!(a Mod b)}386 --387 unaryop(<"+">) _ b:@ {expr_un!(Plus b)}388 unaryop(<"-">) _ b:@ {expr_un!(Minus b)}389 unaryop(<"!">) _ b:@ {expr_un!(Not b)}390 unaryop(<"~">) _ b:@ {expr_un!(BitNot b)}391 --392 value:(@) _ "[" _ slice:slice_desc(s) _ "]" {Expr::Slice(Box::new(Slice{value, slice}))}393 indexable:(@) _ parts:index_part(s)+ {Expr::Index{indexable: Box::new(indexable), parts}}394 a:(@) _ args:spanned(<"(" _ a:args(s) _ ")" {a}>, s) ts:(_ keyword("tailstrict"))? {Expr::Apply(Box::new(a), args, ts.is_some())}395 a:(@) _ "{" _ body:objinside(s) _ "}" {Expr::ObjExtend(Rc::new(a), body)}396 --397 e:expr_basic(s) {e}398 "(" _ e:expr(s) _ ")" {e}399 }400 pub rule index_part(s: &ParserSettings) -> IndexPart401 = n:("?" _ ensure_null_coaelse())? "." _ value:id_loc(s) {IndexPart {402 span: value.span,403 value: value.value,404 #[cfg(feature = "exp-null-coaelse")]405 null_coaelse: n.is_some(),406 }}407 / n:("?" _ "." _ ensure_null_coaelse())? value:spanned(<"[" _ v:expr(s) _ "]" {v}>, s) {IndexPart {408 span: value.span,409 value: value.value,410 #[cfg(feature = "exp-null-coaelse")]411 null_coaelse: n.is_some(),412 }}413414 pub rule jsonnet(s: &ParserSettings) -> Expr = _ e:expr(s) _ {e}415 }416}417418pub type ParseError = peg::error::ParseError<peg::str::LineCol>;419pub fn parse(str: &str, settings: &ParserSettings) -> Result<Expr, ParseError> {420 jsonnet_parser::jsonnet(str, settings)421}422423pub fn string_to_expr(str: IStr, settings: &ParserSettings) -> Spanned<Expr> {424 let len = str.len();425 Spanned::new(Expr::Str(str), Span(settings.source.clone(), 0, len as u32))426}427428#[cfg(test)]429mod tests {430 use std::fs;431432 use insta::{assert_snapshot, glob};433 use jrsonnet_ir::{IStr, Source};434435 use crate::{ParserSettings, parse};436437 #[test]438 fn snapshots() {439 glob!("tests/*.jsonnet", |path| {440 let input = fs::read_to_string(path).expect("read test file");441 let v = parse(442 &input,443 &ParserSettings {444 source: Source::new_virtual("<test>".into(), IStr::empty()),445 },446 )447 .unwrap();448 let v = format!("{v:#?}");449 assert_snapshot!(v);450 });451 }452}