1use crate::{2 binding, context_creator, create_error, function_default, function_rhs, future_wrapper,3 lazy_val, push, Context, ContextCreator, FuncDesc, LazyBinding, LazyVal, ObjMember, ObjValue,4 Result, Val,5};6use closure::closure;7use jsonnet_parser::{8 ArgsDesc, AssertStmt, BinaryOpType, BindSpec, CompSpec, Expr, FieldMember, ForSpecData,9 IfSpecData, LiteralType, LocExpr, Member, ObjBody, ParamsDesc, UnaryOpType, Visibility,10};11use std::{12 collections::{BTreeMap, HashMap},13 rc::Rc,14};1516pub fn evaluate_binding(b: &BindSpec, context_creator: ContextCreator) -> (String, LazyBinding) {17 let b = b.clone();18 if let Some(args) = &b.params {19 let args = args.clone();20 (21 b.name.clone(),22 LazyBinding::Bindable(Rc::new(move |this, super_obj| {23 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 )32 } else {33 (34 b.name.clone(),35 LazyBinding::Bindable(Rc::new(move |this, super_obj| {36 Ok(lazy_val!(closure!(clone context_creator, clone b, ||37 push(b.value.clone(), "thunk".to_owned(), ||{38 evaluate(39 context_creator.0(this.clone(), super_obj.clone())?,40 &b.value41 )42 })43 )))44 })),45 )46 }47}4849pub fn evaluate_method(ctx: Context, expr: &LocExpr, arg_spec: ParamsDesc) -> Val {50 Val::Func(FuncDesc {51 ctx,52 params: arg_spec,53 eval_rhs: function_rhs!(closure!(clone expr, |ctx| evaluate(ctx, &expr))),54 eval_default: function_default!(closure!(|ctx, default| evaluate(ctx, &default))),55 })56}5758pub fn evaluate_field_name(59 context: Context,60 field_name: &jsonnet_parser::FieldName,61) -> Result<Option<String>> {62 Ok(match field_name {63 jsonnet_parser::FieldName::Fixed(n) => Some(n.clone()),64 jsonnet_parser::FieldName::Dyn(expr) => {65 let value = evaluate(context, expr)?.unwrap_if_lazy()?;66 if matches!(value, Val::Null) {67 None68 } else {69 Some(value.try_cast_str("dynamic field name")?)70 }71 }72 })73}7475pub fn evaluate_unary_op(op: UnaryOpType, b: &Val) -> Result<Val> {76 Ok(match (op, b) {77 (o, Val::Lazy(l)) => evaluate_unary_op(o, &l.evaluate()?)?,78 (UnaryOpType::Not, Val::Bool(v)) => Val::Bool(!v),79 (UnaryOpType::Minus, Val::Num(n)) => Val::Num(-*n),80 (UnaryOpType::BitNot, Val::Num(n)) => Val::Num(!(*n as i32) as f64),81 (op, o) => panic!("unary op not implemented: {:?} {:?}", op, o),82 })83}8485pub(crate) fn evaluate_add_op(a: &Val, b: &Val) -> Result<Val> {86 Ok(match (a, b) {87 (Val::Str(v1), Val::Str(v2)) => Val::Str(v1.to_owned() + &v2),8889 (Val::Str(v1), Val::Num(v2)) => Val::Str(format!("{}{}", v1, v2)),90 (Val::Num(v1), Val::Str(v2)) => Val::Str(format!("{}{}", v1, v2)),91 (Val::Str(v1), Val::Bool(v2)) => Val::Str(format!("{}{}", v1, v2)),92 (Val::Bool(v1), Val::Str(v2)) => Val::Str(format!("{}{}", v1, v2)),93 (Val::Str(v1), Val::Null) => Val::Str(format!("{}null", v1)),94 (Val::Null, Val::Str(v2)) => Val::Str(format!("null{}", v2)),9596 (Val::Obj(v1), Val::Obj(v2)) => Val::Obj(v2.with_super(v1.clone())),97 (Val::Arr(a), Val::Arr(b)) => Val::Arr([&a[..], &b[..]].concat()),98 (Val::Num(v1), Val::Num(v2)) => Val::Num(v1 + v2),99 _ => panic!("can't add: {:?} and {:?}", a, b),100 })101}102103pub fn evaluate_binary_op_special(104 context: Context,105 a: &LocExpr,106 op: BinaryOpType,107 b: &LocExpr,108) -> Result<Val> {109 Ok(110 match (evaluate(context.clone(), &a)?.unwrap_if_lazy()?, op, b) {111 (Val::Bool(true), BinaryOpType::Or, _o) => Val::Bool(true),112 (Val::Bool(false), BinaryOpType::And, _o) => Val::Bool(false),113 (a, op, eb) => {114 evaluate_binary_op_normal(&a, op, &evaluate(context, eb)?.unwrap_if_lazy()?)?115 }116 },117 )118}119120pub fn evaluate_binary_op_normal(a: &Val, op: BinaryOpType, b: &Val) -> Result<Val> {121 Ok(match (a, op, b) {122 (a, BinaryOpType::Add, b) => evaluate_add_op(a, b)?,123124 (Val::Str(v1), BinaryOpType::Mul, Val::Num(v2)) => Val::Str(v1.repeat(*v2 as usize)),125126 127 (Val::Bool(a), BinaryOpType::And, Val::Bool(b)) => Val::Bool(*a && *b),128 (Val::Bool(a), BinaryOpType::Or, Val::Bool(b)) => Val::Bool(*a || *b),129130 131 (Val::Str(v1), BinaryOpType::Lt, Val::Str(v2)) => Val::Bool(v1 < v2),132 (Val::Str(v1), BinaryOpType::Gt, Val::Str(v2)) => Val::Bool(v1 > v2),133 (Val::Str(v1), BinaryOpType::Lte, Val::Str(v2)) => Val::Bool(v1 <= v2),134 (Val::Str(v1), BinaryOpType::Gte, Val::Str(v2)) => Val::Bool(v1 >= v2),135136 137 (Val::Num(v1), BinaryOpType::Mul, Val::Num(v2)) => Val::Num(v1 * v2),138 (Val::Num(v1), BinaryOpType::Div, Val::Num(v2)) => Val::Num(v1 / v2),139140 (Val::Num(v1), BinaryOpType::Sub, Val::Num(v2)) => Val::Num(v1 - v2),141142 (Val::Num(v1), BinaryOpType::Lt, Val::Num(v2)) => Val::Bool(v1 < v2),143 (Val::Num(v1), BinaryOpType::Gt, Val::Num(v2)) => Val::Bool(v1 > v2),144 (Val::Num(v1), BinaryOpType::Lte, Val::Num(v2)) => Val::Bool(v1 <= v2),145 (Val::Num(v1), BinaryOpType::Gte, Val::Num(v2)) => Val::Bool(v1 >= v2),146147 (Val::Num(v1), BinaryOpType::BitAnd, Val::Num(v2)) => {148 Val::Num(((*v1 as i32) & (*v2 as i32)) as f64)149 }150 (Val::Num(v1), BinaryOpType::BitOr, Val::Num(v2)) => {151 Val::Num(((*v1 as i32) | (*v2 as i32)) as f64)152 }153 (Val::Num(v1), BinaryOpType::BitXor, Val::Num(v2)) => {154 Val::Num(((*v1 as i32) ^ (*v2 as i32)) as f64)155 }156 (Val::Num(v1), BinaryOpType::Lhs, Val::Num(v2)) => {157 Val::Num(((*v1 as i32) << (*v2 as i32)) as f64)158 }159 (Val::Num(v1), BinaryOpType::Rhs, Val::Num(v2)) => {160 Val::Num(((*v1 as i32) >> (*v2 as i32)) as f64)161 }162163 _ => panic!("no rules for binary operation: {:?} {:?} {:?}", a, op, b),164 })165}166167future_wrapper!(HashMap<String, LazyBinding>, FutureNewBindings);168future_wrapper!(ObjValue, FutureObjValue);169170pub fn evaluate_comp(171 context: Context,172 value: &LocExpr,173 specs: &[CompSpec],174) -> Result<Option<Vec<Val>>> {175 Ok(match specs.get(0) {176 None => Some(vec![evaluate(context, &value)?]),177 Some(CompSpec::IfSpec(IfSpecData(cond))) => {178 if evaluate(context.clone(), &cond)?.try_cast_bool("if spec")? {179 evaluate_comp(context, value, &specs[1..])?180 } else {181 None182 }183 }184 Some(CompSpec::ForSpec(ForSpecData(var, expr))) => {185 match evaluate(context.clone(), &expr)?.unwrap_if_lazy()? {186 Val::Arr(list) => {187 let mut out = Vec::new();188 for item in list {189 let item = item.clone().unwrap_if_lazy()?;190 out.push(evaluate_comp(191 context.with_var(var.clone(), item)?,192 value,193 &specs[1..],194 )?);195 }196 Some(out.iter().flatten().flatten().cloned().collect())197 }198 _ => panic!("for expression evaluated to non-iterable value"),199 }200 }201 })202}203204205pub fn evaluate_object(context: Context, object: ObjBody) -> Result<ObjValue> {206 Ok(match object {207 ObjBody::MemberList(members) => {208 let new_bindings = FutureNewBindings::new();209 let future_this = FutureObjValue::new();210 let context_creator = context_creator!(211 closure!(clone context, clone new_bindings, clone future_this, |this: Option<ObjValue>, super_obj: Option<ObjValue>| {212 Ok(context.clone().extend(213 new_bindings.clone().unwrap(),214 context.clone().dollar().clone().or_else(||this.clone()),215 Some(this.unwrap()),216 super_obj217 )?)218 })219 );220 {221 let mut bindings: HashMap<String, LazyBinding> = HashMap::new();222 for (n, b) in members223 .iter()224 .filter_map(|m| match m {225 Member::BindStmt(b) => Some(b.clone()),226 _ => None,227 })228 .map(|b| evaluate_binding(&b, context_creator.clone()))229 {230 bindings.insert(n, b);231 }232 new_bindings.fill(bindings);233 }234235 let mut new_members = BTreeMap::new();236 for member in members.into_iter() {237 match member {238 Member::Field(FieldMember {239 name,240 plus,241 params: None,242 visibility,243 value,244 }) => {245 let name = evaluate_field_name(context.clone(), &name)?;246 if name.is_none() {247 continue;248 }249 let name = name.unwrap();250 new_members.insert(251 name.clone(),252 ObjMember {253 add: plus,254 visibility: visibility.clone(),255 invoke: binding!(256 closure!(clone name, clone value, clone context_creator, |this, super_obj| {257 push(value.clone(), "object ".to_owned()+&name+" field", ||{258 let context = context_creator.0(this, super_obj)?;259 evaluate(260 context,261 &value,262 )?.unwrap_if_lazy()263 })264 })265 ),266 },267 );268 }269 Member::Field(FieldMember {270 name,271 params: Some(params),272 value,273 ..274 }) => {275 let name = evaluate_field_name(context.clone(), &name)?;276 if name.is_none() {277 continue;278 }279 let name = name.unwrap();280 new_members.insert(281 name,282 ObjMember {283 add: false,284 visibility: Visibility::Hidden,285 invoke: binding!(286 closure!(clone value, clone context_creator, |this, super_obj| {287 288 Ok(evaluate_method(289 context_creator.0(this, super_obj)?,290 &value.clone(),291 params.clone(),292 ))293 })294 ),295 },296 );297 }298 Member::BindStmt(_) => {}299 Member::AssertStmt(_) => {}300 }301 }302 future_this.fill(ObjValue::new(None, Rc::new(new_members)))303 }304 _ => todo!(),305 })306}307308pub fn evaluate(context: Context, expr: &LocExpr) -> Result<Val> {309 use Expr::*;310 let locexpr = expr.clone();311 let LocExpr(expr, loc) = expr;312 Ok(match &**expr {313 Literal(LiteralType::This) => Val::Obj(314 context315 .this()316 .clone()317 .unwrap_or_else(|| panic!("this not found")),318 ),319 Literal(LiteralType::Dollar) => Val::Obj(320 context321 .dollar()322 .clone()323 .unwrap_or_else(|| panic!("dollar not found")),324 ),325 Literal(LiteralType::True) => Val::Bool(true),326 Literal(LiteralType::False) => Val::Bool(false),327 Literal(LiteralType::Null) => Val::Null,328 Parened(e) => evaluate(context, e)?,329 Str(v) => Val::Str(v.clone()),330 Num(v) => Val::Num(*v),331 BinaryOp(v1, o, v2) => evaluate_binary_op_special(context, &v1, *o, &v2)?,332 UnaryOp(o, v) => evaluate_unary_op(*o, &evaluate(context, v)?)?,333 Var(name) => push(locexpr, "var".to_owned(), || {334 Val::Lazy(context.binding(&name)).unwrap_if_lazy()335 })?,336 Index(LocExpr(v, _), index) if matches!(&**v, Expr::Literal(LiteralType::Super)) => {337 let name = evaluate(context.clone(), index)?.try_cast_str("object index")?;338 context339 .super_obj()340 .clone()341 .expect("no super found")342 .get_raw(&name, &context.this().clone().expect("no this found"))?343 .expect("value not found")344 }345 Index(value, index) => {346 match (347 evaluate(context.clone(), value)?.unwrap_if_lazy()?,348 evaluate(context, index)?,349 ) {350 (Val::Obj(v), Val::Str(s)) => {351 if let Some(v) = v.get(&s)? {352 v.unwrap_if_lazy()?353 } else if let Some(Val::Str(n)) = v.get("__intristic_namespace__")? {354 Val::Intristic(n, s)355 } else {356 create_error(crate::Error::NoSuchField(s))?357 }358 }359 (Val::Arr(v), Val::Num(n)) => v360 .get(n as usize)361 .unwrap_or_else(|| panic!("out of bounds"))362 .clone()363 .unwrap_if_lazy()?,364 (Val::Str(s), Val::Num(n)) => {365 Val::Str(s.chars().skip(n as usize).take(1).collect())366 }367 (v, i) => todo!("not implemented: {:?}[{:?}]", v, i.unwrap_if_lazy()),368 }369 }370 LocalExpr(bindings, returned) => {371 let mut new_bindings: HashMap<String, LazyBinding> = HashMap::new();372 let future_context = Context::new_future();373374 let context_creator = context_creator!(375 closure!(clone future_context, |_, _| Ok(future_context.clone().unwrap()))376 );377378 for (k, v) in bindings379 .iter()380 .map(|b| evaluate_binding(b, context_creator.clone()))381 {382 new_bindings.insert(k, v);383 }384385 let context = context386 .extend(new_bindings, None, None, None)?387 .into_future(future_context);388 evaluate(context, &returned.clone())?389 }390 Arr(items) => {391 let mut out = Vec::with_capacity(items.len());392 for item in items {393 out.push(Val::Lazy(lazy_val!(394 closure!(clone context, clone item, || {395 evaluate(context.clone(), &item)396 })397 )));398 }399 Val::Arr(out)400 }401 ArrComp(expr, compspecs) => Val::Arr(402 403 evaluate_comp(context, expr, compspecs)?.unwrap(),404 ),405 Obj(body) => Val::Obj(evaluate_object(context, body.clone())?),406 ObjExtend(s, t) => evaluate_add_op(407 &evaluate(context.clone(), s)?,408 &Val::Obj(evaluate_object(context, t.clone())?),409 )?,410 Apply(value, ArgsDesc(args), tailstrict) => {411 let value = evaluate(context.clone(), value)?.unwrap_if_lazy()?;412 match value {413 Val::Intristic(ns, name) => match (&ns as &str, &name as &str) {414 415 ("std", "length") => {416 assert_eq!(args.len(), 1);417 let expr = &args.get(0).unwrap().1;418 match evaluate(context, expr)? {419 Val::Str(n) => Val::Num(n.chars().count() as f64),420 Val::Arr(i) => Val::Num(i.len() as f64),421 Val::Obj(o) => Val::Num(o.fields().len() as f64),422 v => panic!("can't get length of {:?}", v),423 }424 }425 426 ("std", "type") => {427 assert_eq!(args.len(), 1);428 let expr = &args.get(0).unwrap().1;429 Val::Str(evaluate(context, expr)?.value_type()?.name().to_owned())430 }431 432 ("std", "makeArray") => {433 assert_eq!(args.len(), 2);434 if let (Val::Num(v), Val::Func(d)) = (435 evaluate(context.clone(), &args[0].1)?,436 evaluate(context, &args[1].1)?,437 ) {438 assert!(v >= 0.0);439 let mut out = Vec::with_capacity(v as usize);440 for i in 0..v as usize {441 out.push(d.evaluate(vec![(None, Val::Num(i as f64))])?)442 }443 Val::Arr(out)444 } else {445 panic!("bad makeArray call");446 }447 }448 449 ("std", "codepoint") => {450 assert_eq!(args.len(), 1);451 if let Val::Str(s) = evaluate(context, &args[0].1)? {452 assert!(453 s.chars().count() == 1,454 "std.codepoint should receive single char string"455 );456 Val::Num(s.chars().take(1).next().unwrap() as u32 as f64)457 } else {458 panic!("bad codepoint call");459 }460 }461 462 ("std", "objectFieldsEx") => {463 assert_eq!(args.len(), 2);464 if let (Val::Obj(body), Val::Bool(_include_hidden)) = (465 evaluate(context.clone(), &args[0].1)?,466 evaluate(context, &args[1].1)?,467 ) {468 469 Val::Arr(body.fields().into_iter().map(Val::Str).collect())470 } else {471 panic!("bad objectFieldsEx call");472 }473 }474 ("std", "primitiveEquals") => {475 assert_eq!(args.len(), 2);476 let (a, b) = (477 evaluate(context.clone(), &args[0].1)?,478 evaluate(context, &args[1].1)?,479 );480 Val::Bool(a == b)481 }482 ("std", "modulo") => {483 assert_eq!(args.len(), 2);484 if let (Val::Num(a), Val::Num(b)) = (485 evaluate(context.clone(), &args[0].1)?,486 evaluate(context, &args[1].1)?,487 ) {488 Val::Num(a % b)489 } else {490 panic!("bad modulo call");491 }492 }493 ("std", "floor") => {494 assert_eq!(args.len(), 1);495 if let Val::Num(a) = evaluate(context, &args[0].1)? {496 Val::Num(a.floor())497 } else {498 panic!("bad floor call");499 }500 }501 ("std", "trace") => {502 assert_eq!(args.len(), 2);503 if let (Val::Str(a), b) = (504 evaluate(context.clone(), &args[0].1)?,505 evaluate(context, &args[1].1)?,506 ) {507 508 println!("TRACE: {}", a);509 b510 } else {511 panic!("bad trace call");512 }513 }514 (ns, name) => panic!("Intristic not found: {}.{}", ns, name),515 },516 Val::Func(f) => push(locexpr, "function call".to_owned(), || {517 f.evaluate(518 args.clone()519 .into_iter()520 .map(move |a| {521 (522 a.clone().0,523 if *tailstrict {524 Val::Lazy(LazyVal::new_resolved(525 evaluate(context.clone(), &a.1).unwrap(),526 ))527 } else {528 Val::Lazy(lazy_val!(529 closure!(clone context, clone a, || evaluate(context.clone(), &a.clone().1))530 ))531 },532 )533 })534 .collect(),535 )536 })?,537 _ => panic!("{:?} is not a function", value),538 }539 }540 Function(params, body) => evaluate_method(context, body, params.clone()),541 AssertExpr(AssertStmt(value, msg), returned) => {542 let assertion_result = push(value.clone(), "assertion condition".to_owned(), || {543 evaluate(context.clone(), &value)?544 .try_cast_bool("assertion condition should be boolean")545 })?;546 if assertion_result {547 push(548 returned.clone(),549 "assert 'return' branch".to_owned(),550 || evaluate(context, returned),551 )?552 } else if let Some(msg) = msg {553 panic!(554 "assertion failed ({:?}): {}",555 value,556 evaluate(context, msg)?.try_cast_str("assertion message should be string")?557 );558 } else {559 panic!("assertion failed ({:?}): no message", value);560 }561 }562 Error(e) => create_error(crate::Error::RuntimeError(563 evaluate(context, e)?.try_cast_str("error text should be string")?,564 ))?,565 IfElse {566 cond,567 cond_then,568 cond_else,569 } => {570 let condition_result = push(cond.0.clone(), "if condition".to_owned(), || {571 evaluate(context.clone(), &cond.0)?.try_cast_bool("if condition should be boolean")572 })?;573 if condition_result {574 push(575 cond_then.clone(),576 "if condition 'then' branch".to_owned(),577 || evaluate(context, cond_then),578 )?579 } else {580 match cond_else {581 Some(v) => push(v.clone(), "if condition 'else' branch".to_owned(), || {582 evaluate(context, v)583 })?,584 None => Val::Null,585 }586 }587 }588 _ => panic!(589 "evaluation not implemented: {:?}",590 LocExpr(expr.clone(), loc.clone())591 ),592 })593}