difftreelog
feat(evaluator) better stacktraces
in: master
1 file changed
crates/jsonnet-evaluator/src/evaluate.rsdiffbeforeafterboth1use 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}195196// TODO: Asserts197pub 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,240 ObjMember {241 add: plus,242 visibility: visibility.clone(),243 invoke: binding!(244 closure!(clone value, clone context_creator, |this, super_obj| {245 let context = context_creator.0(this, super_obj)?;246 // TODO: Assert247 evaluate(248 context,249 &value,250 )?.unwrap_if_lazy()251 })252 ),253 },254 );255 }256 Member::Field(FieldMember {257 name,258 params: Some(params),259 value,260 ..261 }) => {262 let name = evaluate_field_name(context.clone(), &name)?;263 new_members.insert(264 name,265 ObjMember {266 add: false,267 visibility: Visibility::Hidden,268 invoke: binding!(269 closure!(clone value, clone context_creator, |this, super_obj| {270 // TODO: Assert271 Ok(evaluate_method(272 context_creator.0(this, super_obj)?,273 &value.clone(),274 params.clone(),275 ))276 })277 ),278 },279 );280 }281 Member::BindStmt(_) => {}282 Member::AssertStmt(_) => {}283 }284 }285 future_this.fill(ObjValue::new(None, Rc::new(new_members)))286 }287 _ => todo!(),288 })289}290291pub fn evaluate(context: Context, expr: &LocExpr) -> Result<Val> {292 use Expr::*;293 push(expr.clone(), "expr".to_owned(), || {294 let LocExpr(expr, loc) = expr;295 Ok(match &**expr {296 Literal(LiteralType::This) => Val::Obj(297 context298 .this()299 .clone()300 .unwrap_or_else(|| panic!("this not found")),301 ),302 Literal(LiteralType::Super) => Val::Obj(303 context304 .super_obj()305 .clone()306 .unwrap_or_else(|| panic!("super not found")),307 ),308 Literal(LiteralType::True) => Val::Bool(true),309 Literal(LiteralType::False) => Val::Bool(false),310 Literal(LiteralType::Null) => Val::Null,311 Parened(e) => evaluate(context, e)?,312 Str(v) => Val::Str(v.clone()),313 Num(v) => Val::Num(*v),314 BinaryOp(v1, o, v2) => {315 let a = evaluate(context.clone(), v1)?.unwrap_if_lazy()?;316 let op = *o;317 let b = evaluate(context.clone(), v2)?.unwrap_if_lazy()?;318 evaluate_binary_op(context, &a, op, &b)?319 }320 UnaryOp(o, v) => evaluate_unary_op(*o, &evaluate(context, v)?)?,321 Var(name) => Val::Lazy(context.binding(&name)).unwrap_if_lazy()?,322 Index(value, index) => {323 match (324 evaluate(context.clone(), value)?.unwrap_if_lazy()?,325 evaluate(context.clone(), index)?,326 ) {327 (Val::Obj(v), Val::Str(s)) => {328 if let Some(v) = v.get(&s)? {329 v.unwrap_if_lazy()?330 } else if let Some(Val::Str(n)) = v.get("__intristic_namespace__")? {331 Val::Intristic(n, s)332 } else {333 create_error(crate::Error::NoSuchField(s))?334 }335 }336 (Val::Arr(v), Val::Num(n)) => v337 .get(n as usize)338 .unwrap_or_else(|| panic!("out of bounds"))339 .clone(),340 (Val::Str(s), Val::Num(n)) => {341 Val::Str(s.chars().skip(n as usize).take(1).collect())342 }343 (v, i) => todo!("not implemented: {:?}[{:?}]", v, i.unwrap_if_lazy()),344 }345 }346 LocalExpr(bindings, returned) => {347 let mut new_bindings: HashMap<String, LazyBinding> = HashMap::new();348 let future_context = Context::new_future();349350 let context_creator = context_creator!(351 closure!(clone future_context, |_, _| Ok(future_context.clone().unwrap()))352 );353354 for (k, v) in bindings355 .iter()356 .map(|b| evaluate_binding(b, context_creator.clone()))357 {358 new_bindings.insert(k, v);359 }360361 let context = context362 .extend(new_bindings, None, None, None)?363 .into_future(future_context);364 evaluate(context, &returned.clone())?365 }366 Arr(items) => {367 let mut out = Vec::with_capacity(items.len());368 for item in items {369 out.push(evaluate(context.clone(), item)?);370 }371 Val::Arr(out)372 }373 ArrComp(expr, compspecs) => Val::Arr(374 // First compspec should be forspec, so no "None" possible here375 evaluate_comp(context, expr, compspecs)?.unwrap(),376 ),377 Obj(body) => Val::Obj(evaluate_object(context, body.clone())?),378 Apply(value, ArgsDesc(args)) => {379 let value = evaluate(context.clone(), value)?.unwrap_if_lazy()?;380 match value {381 // TODO: Capture context of application382 Val::Intristic(ns, name) => match (&ns as &str, &name as &str) {383 // arr/string/function384 ("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 // any394 ("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 // length, idx=>any400 ("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 // string417 ("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 // object, includeHidden430 ("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 // TODO: handle visibility (_include_hidden)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) => f.evaluate(445 args.clone()446 .into_iter()447 .map(move |a| {448 (449 a.clone().0,450 Val::Lazy(lazy_val!(451 closure!(clone context, clone a, || evaluate(context.clone(), &a.clone().1))452 )),453 )454 })455 .collect(),456 )?,457 _ => panic!("{:?} is not a function", value),458 }459 }460 Function(params, body) => evaluate_method(context, body, params.clone()),461 AssertExpr(AssertStmt(value, msg), returned) => {462 if evaluate(context.clone(), &value)?463 .try_cast_bool("assertion condition should be boolean")?464 {465 evaluate(context, returned)?466 } else if let Some(msg) = msg {467 panic!(468 "assertion failed ({:?}): {}",469 value,470 evaluate(context, msg)?471 .try_cast_str("assertion message should be string")?472 );473 } else {474 panic!("assertion failed ({:?}): no message", value);475 }476 }477 Error(e) => create_error(crate::Error::RuntimeError(478 evaluate(context, e)?.try_cast_str("error text should be string")?,479 ))?,480 IfElse {481 cond,482 cond_then,483 cond_else,484 } => {485 if evaluate(context.clone(), &cond.0)?486 .try_cast_bool("if condition should be boolean")?487 {488 evaluate(context, cond_then)?489 } else {490 match cond_else {491 Some(v) => evaluate(context, v)?,492 None => Val::Bool(false),493 }494 }495 }496 _ => panic!(497 "evaluation not implemented: {:?}",498 LocExpr(expr.clone(), loc.clone())499 ),500 })501 })502}