diff --git a/Cargo.lock b/Cargo.lock
index 01e6ec5..960095a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -70,6 +70,10 @@ name = "argus-wasm"
 version = "0.1.4"
 dependencies = [
  "argus",
+ "js-sys",
+ "serde",
+ "serde-wasm-bindgen",
+ "serde_json",
  "wasm-bindgen",
 ]
 
@@ -176,6 +180,22 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
+
+[[package]]
+name = "js-sys"
+version = "0.3.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b011eec8cc36da2aab2d5cff675ec18454fad408585853910a202391cf9f8e65"
+dependencies = [
+ "once_cell",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.177"
@@ -284,6 +304,12 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
+[[package]]
+name = "ryu"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
+
 [[package]]
 name = "semver"
 version = "1.0.27"
@@ -300,6 +326,17 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-wasm-bindgen"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8302e169f0eddcc139c70f139d19d6467353af16f9fce27e8c30158036a1e16b"
+dependencies = [
+ "js-sys",
+ "serde",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "serde_core"
 version = "1.0.228"
@@ -320,6 +357,19 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.145"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "402a6f66d8c709116cf22f558eab210f5a50187f702eb4d7e5ef38d9a7f1c79c"
+dependencies = [
+ "itoa",
+ "memchr",
+ "ryu",
+ "serde",
+ "serde_core",
+]
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
diff --git a/Cargo.toml b/Cargo.toml
index b66f034..715d852 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,5 +7,9 @@ crate-type = ["cdylib"]
 
 [dependencies]
 argus = { git = "https://deemz.org/git/research/argus.git", branch = "dev" }
+js-sys = "0.3.82"
+serde = { version = "1.0.228", features = ["derive"] }
+serde-wasm-bindgen = "0.6.5"
+serde_json = "1.0.145"
 wasm-bindgen = "0.2.105"
 
diff --git a/pkg/argus_wasm.d.ts b/pkg/argus_wasm.d.ts
index e0ca6ca..84fbd5a 100644
--- a/pkg/argus_wasm.d.ts
+++ b/pkg/argus_wasm.d.ts
@@ -1,7 +1,17 @@
 /* tslint:disable */
 /* eslint-disable */
-export function parse_str(s: string): WrappedExpr;
-export class WrappedExpr {
+export function eval_boolean(s: string, trace: StateBuddyTrace): StateBuddyEvalResult;
+export class StateBuddyEvalResult {
+  private constructor();
+  free(): void;
+  [Symbol.dispose](): void;
+}
+export class StateBuddyEvalResultEntry {
+  private constructor();
+  free(): void;
+  [Symbol.dispose](): void;
+}
+export class StateBuddyTrace {
   private constructor();
   free(): void;
   [Symbol.dispose](): void;
@@ -11,8 +21,10 @@ export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembl
 
 export interface InitOutput {
   readonly memory: WebAssembly.Memory;
-  readonly __wbg_wrappedexpr_free: (a: number, b: number) => void;
-  readonly parse_str: (a: number, b: number) => number;
+  readonly __wbg_statebuddytrace_free: (a: number, b: number) => void;
+  readonly eval_boolean: (a: number, b: number, c: number) => number;
+  readonly __wbg_statebuddyevalresultentry_free: (a: number, b: number) => void;
+  readonly __wbg_statebuddyevalresult_free: (a: number, b: number) => void;
   readonly __wbindgen_externrefs: WebAssembly.Table;
   readonly __wbindgen_malloc: (a: number, b: number) => number;
   readonly __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
diff --git a/pkg/argus_wasm.js b/pkg/argus_wasm.js
index 24de4f3..4c6a17a 100644
--- a/pkg/argus_wasm.js
+++ b/pkg/argus_wasm.js
@@ -83,44 +83,92 @@ function passStringToWasm0(arg, malloc, realloc) {
     WASM_VECTOR_LEN = offset;
     return ptr;
 }
+
+function _assertClass(instance, klass) {
+    if (!(instance instanceof klass)) {
+        throw new Error(`expected instance of ${klass.name}`);
+    }
+}
 /**
  * @param {string} s
- * @returns {WrappedExpr}
+ * @param {StateBuddyTrace} trace
+ * @returns {StateBuddyEvalResult}
  */
-export function parse_str(s) {
+export function eval_boolean(s, trace) {
     const ptr0 = passStringToWasm0(s, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
     const len0 = WASM_VECTOR_LEN;
-    const ret = wasm.parse_str(ptr0, len0);
-    return WrappedExpr.__wrap(ret);
+    _assertClass(trace, StateBuddyTrace);
+    const ret = wasm.eval_boolean(ptr0, len0, trace.__wbg_ptr);
+    return StateBuddyEvalResult.__wrap(ret);
 }
 
-const WrappedExprFinalization = (typeof FinalizationRegistry === 'undefined')
+const StateBuddyEvalResultFinalization = (typeof FinalizationRegistry === 'undefined')
     ? { register: () => {}, unregister: () => {} }
-    : new FinalizationRegistry(ptr => wasm.__wbg_wrappedexpr_free(ptr >>> 0, 1));
+    : new FinalizationRegistry(ptr => wasm.__wbg_statebuddyevalresult_free(ptr >>> 0, 1));
 
-export class WrappedExpr {
+export class StateBuddyEvalResult {
 
     static __wrap(ptr) {
         ptr = ptr >>> 0;
-        const obj = Object.create(WrappedExpr.prototype);
+        const obj = Object.create(StateBuddyEvalResult.prototype);
         obj.__wbg_ptr = ptr;
-        WrappedExprFinalization.register(obj, obj.__wbg_ptr, obj);
+        StateBuddyEvalResultFinalization.register(obj, obj.__wbg_ptr, obj);
         return obj;
     }
 
     __destroy_into_raw() {
         const ptr = this.__wbg_ptr;
         this.__wbg_ptr = 0;
-        WrappedExprFinalization.unregister(this);
+        StateBuddyEvalResultFinalization.unregister(this);
         return ptr;
     }
 
     free() {
         const ptr = this.__destroy_into_raw();
-        wasm.__wbg_wrappedexpr_free(ptr, 0);
+        wasm.__wbg_statebuddyevalresult_free(ptr, 0);
     }
 }
-if (Symbol.dispose) WrappedExpr.prototype[Symbol.dispose] = WrappedExpr.prototype.free;
+if (Symbol.dispose) StateBuddyEvalResult.prototype[Symbol.dispose] = StateBuddyEvalResult.prototype.free;
+
+const StateBuddyEvalResultEntryFinalization = (typeof FinalizationRegistry === 'undefined')
+    ? { register: () => {}, unregister: () => {} }
+    : new FinalizationRegistry(ptr => wasm.__wbg_statebuddyevalresultentry_free(ptr >>> 0, 1));
+
+export class StateBuddyEvalResultEntry {
+
+    __destroy_into_raw() {
+        const ptr = this.__wbg_ptr;
+        this.__wbg_ptr = 0;
+        StateBuddyEvalResultEntryFinalization.unregister(this);
+        return ptr;
+    }
+
+    free() {
+        const ptr = this.__destroy_into_raw();
+        wasm.__wbg_statebuddyevalresultentry_free(ptr, 0);
+    }
+}
+if (Symbol.dispose) StateBuddyEvalResultEntry.prototype[Symbol.dispose] = StateBuddyEvalResultEntry.prototype.free;
+
+const StateBuddyTraceFinalization = (typeof FinalizationRegistry === 'undefined')
+    ? { register: () => {}, unregister: () => {} }
+    : new FinalizationRegistry(ptr => wasm.__wbg_statebuddytrace_free(ptr >>> 0, 1));
+
+export class StateBuddyTrace {
+
+    __destroy_into_raw() {
+        const ptr = this.__wbg_ptr;
+        this.__wbg_ptr = 0;
+        StateBuddyTraceFinalization.unregister(this);
+        return ptr;
+    }
+
+    free() {
+        const ptr = this.__destroy_into_raw();
+        wasm.__wbg_statebuddytrace_free(ptr, 0);
+    }
+}
+if (Symbol.dispose) StateBuddyTrace.prototype[Symbol.dispose] = StateBuddyTrace.prototype.free;
 
 const EXPECTED_RESPONSE_TYPES = new Set(['basic', 'cors', 'default']);
 
diff --git a/pkg/argus_wasm_bg.wasm b/pkg/argus_wasm_bg.wasm
index 0880b61..be31eb7 100644
Binary files a/pkg/argus_wasm_bg.wasm and b/pkg/argus_wasm_bg.wasm differ
diff --git a/pkg/argus_wasm_bg.wasm.d.ts b/pkg/argus_wasm_bg.wasm.d.ts
index 2d215e3..9d3e585 100644
--- a/pkg/argus_wasm_bg.wasm.d.ts
+++ b/pkg/argus_wasm_bg.wasm.d.ts
@@ -1,8 +1,10 @@
 /* tslint:disable */
 /* eslint-disable */
 export const memory: WebAssembly.Memory;
-export const __wbg_wrappedexpr_free: (a: number, b: number) => void;
-export const parse_str: (a: number, b: number) => number;
+export const __wbg_statebuddytrace_free: (a: number, b: number) => void;
+export const eval_boolean: (a: number, b: number, c: number) => number;
+export const __wbg_statebuddyevalresultentry_free: (a: number, b: number) => void;
+export const __wbg_statebuddyevalresult_free: (a: number, b: number) => void;
 export const __wbindgen_externrefs: WebAssembly.Table;
 export const __wbindgen_malloc: (a: number, b: number) => number;
 export const __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
diff --git a/src/lib.rs b/src/lib.rs
index 800e5c8..d92bc9f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,33 +1,134 @@
 extern crate wasm_bindgen;
 extern crate argus;
+extern crate serde_json;
+extern crate js_sys;
+extern crate serde;
 
 use wasm_bindgen::prelude::*;
-use argus::expr::Expr;
 
-// use chumsky::prelude::Rich;
+use argus::expr::{Expr};
+use argus::{Trace, Signal, AnySignal, BooleanSemantics};
+use argus::signals::interpolation;
+use std::collections::HashMap;
+use std::vec;
+use serde::{Serialize, Deserialize};
+use std::time::Duration;
 
+// #[wasm_bindgen]
+// pub struct WrappedExpr {
+//     expr: Expr,
+// }
 
-// macro_rules! wasmbind_fn {
-//     ($name:ident($($arg:ident: $t:ty),*) -> $ret:ty) => {
-//         #[wasm_bindgen]
-//         pub fn $name($($arg: $t),*) -> $ret {
-//             my_lib::$name($($arg),*)
-//         }
+// #[wasm_bindgen]
+// pub fn parse_str(s: &str) -> WrappedExpr {
+//     let expr = argus::parse_str(s);
+//     return WrappedExpr{
+//         expr: expr.expect("fuck!!!!"),
 //     };
 // }
 
-// wasmbind_fn!(parse_str(s: &str) -> Result<expr::Expr, Vec<Rich<'_,String>>>);
+struct TraceMap<'a> {
+    events: HashMap<&'a str, Signal<bool>>,
+}
 
-#[wasm_bindgen]
-pub struct WrappedExpr {
-    expr: Expr,
+impl<'a> Trace for TraceMap<'a> {
+    fn signal_names(&self) -> Vec<&str> {
+        self.events.keys().cloned().collect()
+    }
+
+    fn get<T: 'static>(&self, name: &str) -> Option<&Signal<T>> {
+        let sig: &dyn AnySignal = match self.events.get(name) {
+            Some(signal) => signal,
+            None => return None,
+        };
+        sig.as_any().downcast_ref::<Signal<T>>()
+    }
+}
+
+
+
+// type MyTrace = Vec<TraceItem>
+// struct MyResult {
+//     ok: ,
+// }
+
+// pub struct DefaultFalse;
+
+// use argus::signals::{InterpolationMethod, Sample};
+
+// use argus::core::utils::Neighborhood;
+
+// impl InterpolationMethod<bool> for DefaultFalse {
+//     fn at(a: &super::Sample<bool>, b: &super::Sample<bool>, time: std::time::Duration) -> Option<bool> {
+//         if time == a.time {
+//             Some(a.value)
+//         }
+//         else if time == b.time {
+//             Some(b.value)
+//         }
+//         else {
+//             Some(false)
+//         }
+//     }
+
+//     fn find_intersection(_a: &Neighborhood<bool>, _b: &Neighborhood<bool>) -> Option<Sample<bool>> {
+//         None
+//     }
+// }
+
+#[derive(Serialize, Deserialize)]
+pub struct StateBuddyTraceEntry {
+    simtime: f64,
+    inputEvent: String,
+    outputEvents: Vec<String>,
 }
 
 #[wasm_bindgen]
-pub fn parse_str(s: &str) -> WrappedExpr {
-    let expr = argus::parse_str(s);
-    return WrappedExpr{
-        expr: expr.expect("fuck!!!!"),
+pub struct StateBuddyTrace {
+    entries: Vec<StateBuddyTraceEntry>,
+}
+
+
+#[wasm_bindgen]
+pub fn eval_boolean(s: &str, trace: &StateBuddyTrace) -> StateBuddyEvalResult {
+    let mut traceMap = HashMap::<&str, Signal<bool>>::new();
+    for entry in &trace.entries {
+        let value = traceMap.entry(entry.inputEvent.as_str()).or_insert_with(|| Signal::<bool>::Sampled {
+            values: vec![],
+            time_points: vec![],
+        });
+        if let Signal::<bool>::Sampled { values, time_points } = value {
+            values.push(true);
+            time_points.push(Duration::from_millis(entry.simtime as u64));
+        }
+        else {
+            panic!("fuck!!!");
+        }
+    }
+
+    let parse_result = argus::parse_str(s);
+    let expr = parse_result.expect("fuuuckk!!");
+    let eval_result = match expr {
+        Expr::Bool(bool_expr) => BooleanSemantics::eval::<interpolation::Constant>(&bool_expr, &TraceMap{events: traceMap}),
+        _ => panic!("fuuuck"),
     };
+    let mut result = Vec::<StateBuddyEvalResultEntry>::new();
+    eval_result.expect("fuuuck").iter().for_each(|(timestamp, satisfied), | {
+        result.push(StateBuddyEvalResultEntry{
+            timestamp: timestamp.as_millis() as f64,
+            satisfied: *satisfied,
+        });
+    });
+    StateBuddyEvalResult { entries: result }
 }
 
+#[wasm_bindgen]
+pub struct StateBuddyEvalResultEntry {
+    timestamp: f64,
+    satisfied: bool,
+}
+
+#[wasm_bindgen]
+pub struct StateBuddyEvalResult {
+    entries: Vec<StateBuddyEvalResultEntry>,
+}