1use crate::{2 binding, context_creator, create_error, function_default, function_rhs, future_wrapper,3 lazy_binding, lazy_val, push, Context, ContextCreator, FuncDesc, LazyBinding, ObjMember,4 ObjValue, Result, Val,5};6use closure::closure;7use jsonnet_parser::{8 el, Arg, ArgsDesc, AssertStmt, BinaryOpType, BindSpec, CompSpec, Expr, FieldMember,9 ForSpecData, IfSpecData, LiteralType, LocExpr, Member, ObjBody, ParamsDesc, UnaryOpType,10 Visibility,11};12use std::{13 collections::{BTreeMap, HashMap},14 rc::Rc,15};1617pub fn evaluate_binding(b: &BindSpec, context_creator: ContextCreator) -> (String, LazyBinding) {18 let b = b.clone();19 if let Some(args) = &b.params {20 let args = args.clone();21 (22 b.name.clone(),23 lazy_binding!(move |this, super_obj| Ok(lazy_val!(24 closure!(clone b, clone args, clone context_creator, || Ok(evaluate_method(25 context_creator.0(this.clone(), super_obj.clone())?,26 &b.value,27 args.clone()28 )))29 ))),30 )31 } else {32 (33 b.name.clone(),34 lazy_binding!(move |this, super_obj| {35 Ok(lazy_val!(36 closure!(clone context_creator, clone b, || evaluate(37 context_creator.0(this.clone(), super_obj.clone())?,38 &b.value39 ))40 ))41 }),42 )43 }44}4546pub fn evaluate_method(ctx: Context, expr: &LocExpr, arg_spec: ParamsDesc) -> Val {47 Val::Func(FuncDesc {48 ctx,49 params: arg_spec,50 eval_rhs: function_rhs!(closure!(clone expr, |ctx| evaluate(ctx, &expr))),51 eval_default: function_default!(closure!(|ctx, default| evaluate(ctx, &default))),52 })53}5455pub fn evaluate_field_name(56 context: Context,57 field_name: &jsonnet_parser::FieldName,58) -> Result<String> {59 Ok(match field_name {60 jsonnet_parser::FieldName::Fixed(n) => n.clone(),61 jsonnet_parser::FieldName::Dyn(expr) => {62 evaluate(context, expr)?.try_cast_str("dynamic field name")?63 }64 })65}6667pub fn evaluate_unary_op(op: UnaryOpType, b: &Val) -> Result<Val> {68 Ok(match (op, b) {69 (o, Val::Lazy(l)) => evaluate_unary_op(o, &l.evaluate()?)?,70 (UnaryOpType::Not, Val::Bool(v)) => Val::Bool(!v),71 (op, o) => panic!("unary op not implemented: {:?} {:?}", op, o),72 })73}7475pub(crate) fn evaluate_add_op(a: &Val, b: &Val) -> Result<Val> {76 Ok(match (a, b) {77 (Val::Str(v1), Val::Str(v2)) => Val::Str(v1.to_owned() + &v2),78 (Val::Str(v1), Val::Num(v2)) => Val::Str(format!("{}{}", v1, v2)),79 (Val::Num(v1), Val::Str(v2)) => Val::Str(format!("{}{}", v1, v2)),80 (Val::Str(v1), v2) => Val::Str(format!("{}{:?}", v1, v2)),81 (Val::Obj(v1), Val::Obj(v2)) => Val::Obj(v2.with_super(v1.clone())),82 (Val::Arr(a), Val::Arr(b)) => Val::Arr([&a[..], &b[..]].concat()),83 (Val::Num(v1), Val::Num(v2)) => Val::Num(v1 + v2),84 _ => panic!("can't add: {:?} and {:?}", a, b),85 })86}8788pub fn evaluate_binary_op(context: Context, a: &Val, op: BinaryOpType, b: &Val) -> Result<Val> {89 Ok(match (a, op, b) {90 (Val::Lazy(a), o, b) => evaluate_binary_op(context, &a.evaluate()?, o, b)?,91 (a, o, Val::Lazy(b)) => evaluate_binary_op(context, a, o, &b.evaluate()?)?,9293 (a, BinaryOpType::Add, b) => evaluate_add_op(a, b)?,9495 (Val::Str(v1), BinaryOpType::Ne, Val::Str(v2)) => Val::Bool(v1 != v2),9697 (Val::Str(v1), BinaryOpType::Mul, Val::Num(v2)) => Val::Str(v1.repeat(*v2 as usize)),98 (Val::Str(format), BinaryOpType::Mod, args) => evaluate(99 context100 .with_var("__tmp__format__".to_owned(), Val::Str(format.to_owned()))?101 .with_var(102 "__tmp__args__".to_owned(),103 match args {104 Val::Arr(v) => Val::Arr(v.clone()),105 v => Val::Arr(vec![v.clone()]),106 },107 )?,108 &el!(Expr::Apply(109 el!(Expr::Index(110 el!(Expr::Var("std".to_owned())),111 el!(Expr::Str("format".to_owned()))112 )),113 ArgsDesc(vec![114 Arg(None, el!(Expr::Var("__tmp__format__".to_owned()))),115 Arg(None, el!(Expr::Var("__tmp__args__".to_owned())))116 ])117 )),118 )?,119120 (Val::Bool(a), BinaryOpType::And, Val::Bool(b)) => Val::Bool(*a && *b),121 (Val::Bool(a), BinaryOpType::Or, Val::Bool(b)) => Val::Bool(*a || *b),122123 (Val::Num(v1), BinaryOpType::Mul, Val::Num(v2)) => Val::Num(v1 * v2),124 (Val::Num(v1), BinaryOpType::Div, Val::Num(v2)) => Val::Num(v1 / v2),125 (Val::Num(v1), BinaryOpType::Mod, Val::Num(v2)) => Val::Num(v1 % v2),126127 (Val::Num(v1), BinaryOpType::Sub, Val::Num(v2)) => Val::Num(v1 - v2),128129 (Val::Num(v1), BinaryOpType::Lhs, Val::Num(v2)) => {130 Val::Num(((*v1 as i32) << (*v2 as i32)) as f64)131 }132 (Val::Num(v1), BinaryOpType::Rhs, Val::Num(v2)) => {133 Val::Num(((*v1 as i32) >> (*v2 as i32)) as f64)134 }135136 (Val::Num(v1), BinaryOpType::Lt, Val::Num(v2)) => Val::Bool(v1 < v2),137 (Val::Num(v1), BinaryOpType::Gt, Val::Num(v2)) => Val::Bool(v1 > v2),138 (Val::Num(v1), BinaryOpType::Lte, Val::Num(v2)) => Val::Bool(v1 <= v2),139 (Val::Num(v1), BinaryOpType::Gte, Val::Num(v2)) => Val::Bool(v1 >= v2),140141 (Val::Num(v1), BinaryOpType::Eq, Val::Num(v2)) => Val::Bool((v1 - v2).abs() < f64::EPSILON),142 (Val::Num(v1), BinaryOpType::Ne, Val::Num(v2)) => Val::Bool((v1 - v2).abs() > f64::EPSILON),143144 (Val::Num(v1), BinaryOpType::BitAnd, Val::Num(v2)) => {145 Val::Num(((*v1 as i32) & (*v2 as i32)) as f64)146 }147 (Val::Num(v1), BinaryOpType::BitOr, Val::Num(v2)) => {148 Val::Num(((*v1 as i32) | (*v2 as i32)) as f64)149 }150 (Val::Num(v1), BinaryOpType::BitXor, Val::Num(v2)) => {151 Val::Num(((*v1 as i32) ^ (*v2 as i32)) as f64)152 }153 (a, BinaryOpType::Eq, b) => Val::Bool(a == b),154 (a, BinaryOpType::Ne, b) => Val::Bool(a != b),155 _ => panic!("no rules for binary operation: {:?} {:?} {:?}", a, op, b),156 })157}158159future_wrapper!(HashMap<String, LazyBinding>, FutureNewBindings);160future_wrapper!(ObjValue, FutureObjValue);161162pub fn evaluate_comp(163 context: Context,164 value: &LocExpr,165 specs: &[CompSpec],166) -> Result<Option<Vec<Val>>> {167 Ok(match specs.get(0) {168 None => Some(vec![evaluate(context, &value)?]),169 Some(CompSpec::IfSpec(IfSpecData(cond))) => {170 if evaluate(context.clone(), &cond)?.try_cast_bool("if spec")? {171 evaluate_comp(context, value, &specs[1..])?172 } else {173 None174 }175 }176 Some(CompSpec::ForSpec(ForSpecData(var, expr))) => {177 match evaluate(context.clone(), &expr)?.unwrap_if_lazy()? {178 Val::Arr(list) => {179 let mut out = Vec::new();180 for item in list {181 let item = item.clone();182 out.push(evaluate_comp(183 context.with_var(var.clone(), item)?,184 value,185 &specs[1..],186 )?);187 }188 Some(out.iter().flatten().flatten().cloned().collect())189 }190 _ => panic!("for expression evaluated to non-iterable value"),191 }192 }193 })194}195196197pub fn evaluate_object(context: Context, object: ObjBody) -> Result<ObjValue> {198 Ok(match object {199 ObjBody::MemberList(members) => {200 let new_bindings = FutureNewBindings::new();201 let future_this = FutureObjValue::new();202 let context_creator = context_creator!(203 closure!(clone context, clone new_bindings, clone future_this, |this: Option<ObjValue>, super_obj: Option<ObjValue>| {204 Ok(context.clone().extend(205 new_bindings.clone().unwrap(),206 context.clone().dollar().clone().or_else(||this.clone()),207 Some(this.unwrap()),208 super_obj209 )?)210 })211 );212 {213 let mut bindings: HashMap<String, LazyBinding> = HashMap::new();214 for (n, b) in members215 .iter()216 .filter_map(|m| match m {217 Member::BindStmt(b) => Some(b.clone()),218 _ => None,219 })220 .map(|b| evaluate_binding(&b, context_creator.clone()))221 {222 bindings.insert(n, b);223 }224 new_bindings.fill(bindings);225 }226227 let mut new_members = BTreeMap::new();228 for member in members.into_iter() {229 match member {230 Member::Field(FieldMember {231 name,232 plus,233 params: None,234 visibility,235 value,236 }) => {237 let name = evaluate_field_name(context.clone(), &name)?;238 new_members.insert(239 name.clone(),240 ObjMember {241 add: plus,242 visibility: visibility.clone(),243 invoke: binding!(244 closure!(clone name, clone value, clone context_creator, |this, super_obj| {245 push(value.clone(), "object ".to_owned()+&name+" field", ||{246 let context = context_creator.0(this, super_obj)?;247 evaluate(248 context,249 &value,250 )?.unwrap_if_lazy()251 })252 })253 ),254 },255 );256 }257 Member::Field(FieldMember {258 name,259 params: Some(params),260 value,261 ..262 }) => {263 let name = evaluate_field_name(context.clone(), &name)?;264 new_members.insert(265 name,266 ObjMember {267 add: false,268 visibility: Visibility::Hidden,269 invoke: binding!(270 closure!(clone value, clone context_creator, |this, super_obj| {271 272 Ok(evaluate_method(273 context_creator.0(this, super_obj)?,274 &value.clone(),275 params.clone(),276 ))277 })278 ),279 },280 );281 }282 Member::BindStmt(_) => {}283 Member::AssertStmt(_) => {}284 }285 }286 future_this.fill(ObjValue::new(None, Rc::new(new_members)))287 }288 _ => todo!(),289 })290}291292pub fn evaluate(context: Context, expr: &LocExpr) -> Result<Val> {293 use Expr::*;294 let locexpr = expr.clone();295 let LocExpr(expr, loc) = expr;296 Ok(match &**expr {297 Literal(LiteralType::This) => Val::Obj(298 context299 .this()300 .clone()301 .unwrap_or_else(|| panic!("this not found")),302 ),303 Literal(LiteralType::Super) => Val::Obj(304 context305 .super_obj()306 .clone()307 .unwrap_or_else(|| panic!("super not found")),308 ),309 Literal(LiteralType::True) => Val::Bool(true),310 Literal(LiteralType::False) => Val::Bool(false),311 Literal(LiteralType::Null) => Val::Null,312 Parened(e) => evaluate(context, e)?,313 Str(v) => Val::Str(v.clone()),314 Num(v) => Val::Num(*v),315 BinaryOp(v1, o, v2) => {316 let a = evaluate(context.clone(), v1)?.unwrap_if_lazy()?;317 let op = *o;318 let b = evaluate(context.clone(), v2)?.unwrap_if_lazy()?;319 evaluate_binary_op(context, &a, op, &b)?320 }321 UnaryOp(o, v) => evaluate_unary_op(*o, &evaluate(context, v)?)?,322 Var(name) => Val::Lazy(context.binding(&name)).unwrap_if_lazy()?,323 Index(value, index) => {324 match (325 evaluate(context.clone(), value)?.unwrap_if_lazy()?,326 evaluate(context.clone(), index)?,327 ) {328 (Val::Obj(v), Val::Str(s)) => {329 if let Some(v) = v.get(&s)? {330 v.unwrap_if_lazy()?331 } else if let Some(Val::Str(n)) = v.get("__intristic_namespace__")? {332 Val::Intristic(n, s)333 } else {334 create_error(crate::Error::NoSuchField(s))?335 }336 }337 (Val::Arr(v), Val::Num(n)) => v338 .get(n as usize)339 .unwrap_or_else(|| panic!("out of bounds"))340 .clone(),341 (Val::Str(s), Val::Num(n)) => {342 Val::Str(s.chars().skip(n as usize).take(1).collect())343 }344 (v, i) => todo!("not implemented: {:?}[{:?}]", v, i.unwrap_if_lazy()),345 }346 }347 LocalExpr(bindings, returned) => {348 let mut new_bindings: HashMap<String, LazyBinding> = HashMap::new();349 let future_context = Context::new_future();350351 let context_creator = context_creator!(352 closure!(clone future_context, |_, _| Ok(future_context.clone().unwrap()))353 );354355 for (k, v) in bindings356 .iter()357 .map(|b| evaluate_binding(b, context_creator.clone()))358 {359 new_bindings.insert(k, v);360 }361362 let context = context363 .extend(new_bindings, None, None, None)?364 .into_future(future_context);365 evaluate(context, &returned.clone())?366 }367 Arr(items) => {368 let mut out = Vec::with_capacity(items.len());369 for item in items {370 out.push(evaluate(context.clone(), item)?);371 }372 Val::Arr(out)373 }374 ArrComp(expr, compspecs) => Val::Arr(375 376 evaluate_comp(context, expr, compspecs)?.unwrap(),377 ),378 Obj(body) => Val::Obj(evaluate_object(context, body.clone())?),379 Apply(value, ArgsDesc(args)) => {380 let value = evaluate(context.clone(), value)?.unwrap_if_lazy()?;381 match value {382 Val::Intristic(ns, name) => match (&ns as &str, &name as &str) {383 384 ("std", "length") => {385 assert_eq!(args.len(), 1);386 let expr = &args.get(0).unwrap().1;387 match evaluate(context, expr)? {388 Val::Str(n) => Val::Num(n.chars().count() as f64),389 Val::Arr(i) => Val::Num(i.len() as f64),390 v => panic!("can't get length of {:?}", v),391 }392 }393 394 ("std", "type") => {395 assert_eq!(args.len(), 1);396 let expr = &args.get(0).unwrap().1;397 Val::Str(evaluate(context, expr)?.value_type()?.name().to_owned())398 }399 400 ("std", "makeArray") => {401 assert_eq!(args.len(), 2);402 if let (Val::Num(v), Val::Func(d)) = (403 evaluate(context.clone(), &args[0].1)?,404 evaluate(context, &args[1].1)?,405 ) {406 assert!(v > 0.0);407 let mut out = Vec::with_capacity(v as usize);408 for i in 0..v as usize {409 out.push(d.evaluate(vec![(None, Val::Num(i as f64))])?)410 }411 Val::Arr(out)412 } else {413 panic!("bad makeArray call");414 }415 }416 417 ("std", "codepoint") => {418 assert_eq!(args.len(), 1);419 if let Val::Str(s) = evaluate(context, &args[0].1)? {420 assert!(421 s.chars().count() == 1,422 "std.codepoint should receive single char string"423 );424 Val::Num(s.chars().take(1).next().unwrap() as u32 as f64)425 } else {426 panic!("bad codepoint call");427 }428 }429 430 ("std", "objectFieldsEx") => {431 assert_eq!(args.len(), 2);432 if let (Val::Obj(body), Val::Bool(_include_hidden)) = (433 evaluate(context.clone(), &args[0].1)?,434 evaluate(context, &args[1].1)?,435 ) {436 437 Val::Arr(body.fields().into_iter().map(Val::Str).collect())438 } else {439 panic!("bad objectFieldsEx call");440 }441 }442 (ns, name) => panic!("Intristic not found: {}.{}", ns, name),443 },444 Val::Func(f) => push(locexpr.clone(), "function call".to_owned(), || {445 f.evaluate(446 args.clone()447 .into_iter()448 .map(move |a| {449 (450 a.clone().0,451 Val::Lazy(lazy_val!(452 closure!(clone context, clone a, || evaluate(context.clone(), &a.clone().1))453 )),454 )455 })456 .collect(),457 )458 })?,459 _ => panic!("{:?} is not a function", value),460 }461 }462 Function(params, body) => evaluate_method(context, body, params.clone()),463 AssertExpr(AssertStmt(value, msg), returned) => {464 if push(value.clone(), "assertion condition".to_owned(), || {465 evaluate(context.clone(), &value)?466 .try_cast_bool("assertion condition should be boolean")467 })? {468 push(469 returned.clone(),470 "assert 'return' branch".to_owned(),471 || evaluate(context, returned),472 )?473 } else if let Some(msg) = msg {474 panic!(475 "assertion failed ({:?}): {}",476 value,477 evaluate(context, msg)?.try_cast_str("assertion message should be string")?478 );479 } else {480 panic!("assertion failed ({:?}): no message", value);481 }482 }483 Error(e) => create_error(crate::Error::RuntimeError(484 evaluate(context, e)?.try_cast_str("error text should be string")?,485 ))?,486 IfElse {487 cond,488 cond_then,489 cond_else,490 } => {491 if push(cond.0.clone(), "if condition".to_owned(), || {492 evaluate(context.clone(), &cond.0)?.try_cast_bool("if condition should be boolean")493 })? {494 push(495 cond_then.clone(),496 "if condition 'then' branch".to_owned(),497 || evaluate(context, cond_then),498 )?499 } else {500 match cond_else {501 Some(v) => push(v.clone(), "if condition 'else' branch".to_owned(), || {502 evaluate(context, v)503 })?,504 None => Val::Bool(false),505 }506 }507 }508 _ => panic!(509 "evaluation not implemented: {:?}",510 LocExpr(expr.clone(), loc.clone())511 ),512 })513}