From 8a9f3d82a70b0ff6fa60b2d700584b4c6e05b622 Mon Sep 17 00:00:00 2001
From: Joe Bellus <joe@5sigma.io>
Date: Sat, 8 Oct 2022 16:48:17 -0400
Subject: [PATCH] initial commit

---
 .gitignore                   |    1 +
 Cargo.lock                   | 2633 ++++++++++++++++++++++++++++++++++
 Cargo.toml                   |    6 +
 abacus-core/Cargo.toml       |   15 +
 abacus-core/src/dataframe.rs |  477 ++++++
 abacus-core/src/engine.rs    |  100 ++
 abacus-core/src/lib.rs       |    7 +
 abacus-ui/Cargo.toml         |   10 +
 abacus-ui/src/editor.rs      |  160 +++
 abacus-ui/src/main.rs        |   35 +
 10 files changed, 3444 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 abacus-core/Cargo.toml
 create mode 100644 abacus-core/src/dataframe.rs
 create mode 100644 abacus-core/src/engine.rs
 create mode 100644 abacus-core/src/lib.rs
 create mode 100644 abacus-ui/Cargo.toml
 create mode 100644 abacus-ui/src/editor.rs
 create mode 100644 abacus-ui/src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f97022
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+target/
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..469de53
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2633 @@
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+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c8ffb332579b0557b52d268b91feab8df3615f265d5270fec2a8c95b17c1142"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "052be0f94026e6cbc75cdefc9bae13fd6052cdcaf532fa6c45e7ae33a1e6c810"
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+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07bc0c051dc5f23e307b13285f9d75df86bfdf816c5721e573dec1f9b8aa193c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c38c045535d93ec4f0b4defec448e4291638ee608530863b1e2ba115d4fff7f"
+
+[[package]]
+name = "web-sys"
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+checksum = "bcda906d8be16e728fd5adc5b729afad4e444e106ab28cd1c7256e54fa61510f"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
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+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
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+checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
+dependencies = [
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
+
+[[package]]
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+[[package]]
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+version = "0.36.1"
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+
+[[package]]
+name = "windows_x86_64_gnu"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
+
+[[package]]
+name = "wio"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "xi-unicode"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a67300977d3dc3f8034dae89778f502b6ba20b269527b3223ba59c0cf393bb8a"
+
+[[package]]
+name = "xml-rs"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
+
+[[package]]
+name = "yaml-rust"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a7b8286
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[workspace]
+
+members = [
+  "abacus-core",
+  "abacus-ui"
+]
diff --git a/abacus-core/Cargo.toml b/abacus-core/Cargo.toml
new file mode 100644
index 0000000..d67445f
--- /dev/null
+++ b/abacus-core/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "abacus-core"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1", features = ["derive"] } # You only need this if you want app persistence
+syntect = "5.0.0"
+rhai = "1.10.1"
+polars = { version = "0.24.3", features = ["lazy", "rows"] }
+tracing-subscriber = "0.3"
+
+
diff --git a/abacus-core/src/dataframe.rs b/abacus-core/src/dataframe.rs
new file mode 100644
index 0000000..14dbd26
--- /dev/null
+++ b/abacus-core/src/dataframe.rs
@@ -0,0 +1,477 @@
+use super::ScriptResult;
+use polars::prelude::{IntoLazy, NamedFrom, SerReader};
+use std::{
+    any::TypeId,
+    ops::{Add, Deref},
+    str::FromStr,
+};
+
+use rhai::EvalAltResult;
+
+pub fn setup_engine(engine: &mut rhai::Engine) {
+    //polar data frame
+    engine.register_type::<DataFrame>();
+    engine.register_fn("dataframe", script_functions::dataframe);
+    engine.register_fn("select", DataFrame::s_select);
+    engine.register_fn("load_csv", DataFrame::load_csv);
+    // polar series
+    engine.register_type::<Series>();
+    engine.register_indexer_get(Series::s_get);
+    engine.register_fn("series", script_functions::series);
+    engine.register_fn("head", Series::s_head);
+    engine.register_fn("+", Series::add);
+    engine.register_fn("sort", Series::s_sort);
+    engine.register_fn("sum", Series::s_sum);
+    engine.register_fn("add", Series::s_op_add);
+    engine.register_fn("column", DataFrame::s_column);
+    engine.register_fn("+", script_functions::add_series_i64);
+    engine.register_fn("+", script_functions::add_series_f64);
+    engine.register_fn("-", script_functions::subtract_series_i64);
+    engine.register_fn("-", script_functions::subtract_series_f64);
+    // polar expressions
+    engine.register_type::<DataFrameExpression>();
+    engine.register_fn("sum", DataFrameExpression::sum);
+    engine.register_fn("mean", DataFrameExpression::mean);
+    engine.register_fn("min", DataFrameExpression::min);
+    engine.register_fn("max", DataFrameExpression::max);
+    engine.register_fn("first", DataFrameExpression::first);
+    engine.register_fn("count", DataFrameExpression::count);
+    engine.register_fn("eq", DataFrameExpression::eq);
+    engine.register_fn("lt", DataFrameExpression::lt);
+    engine.register_fn("lte", DataFrameExpression::lte);
+    engine.register_fn("gt", DataFrameExpression::gt);
+    engine.register_fn("gte", DataFrameExpression::gte);
+    engine.register_fn("filter", DataFrameExpression::filter);
+    engine.register_fn("column", script_functions::column);
+    engine.register_fn("count", script_functions::count);
+    engine.register_fn("sum", script_functions::sum);
+    engine.register_fn("mean", script_functions::mean);
+    engine.register_fn("min", script_functions::min);
+    engine.register_fn("max", script_functions::max);
+    engine.register_fn("first", script_functions::first);
+}
+
+#[derive(Clone, Debug)]
+pub struct DataFrame(polars::frame::DataFrame);
+
+impl Deref for DataFrame {
+    type Target = polars::frame::DataFrame;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DataFrame {
+    pub fn s_column(&mut self, name: &str) -> ScriptResult<Series> {
+        Ok(Series(
+            self.0.column(name).map_err(|e| e.to_string())?.clone(),
+        ))
+    }
+
+    pub fn load_csv(path: &str) -> ScriptResult<DataFrame> {
+        let df = polars::io::csv::CsvReader::from_path(path)
+            .map_err(|e| e.to_string())?
+            .has_header(true)
+            .finish()
+            .map_err(|e| e.to_string())?;
+        Ok(DataFrame(df))
+    }
+
+    pub fn s_select(&mut self, expressions: rhai::Array) -> ScriptResult<DataFrame> {
+        let expressions = expressions
+            .into_iter()
+            .filter_map(|i| i.try_cast::<DataFrameExpression>())
+            .map(polars::lazy::dsl::Expr::from)
+            .collect::<Vec<_>>();
+        Ok(DataFrame(
+            self.0
+                .clone()
+                .lazy()
+                .select(expressions)
+                .collect()
+                .map_err(|e| e.to_string())?,
+        ))
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct DataFrameExpression(polars::lazy::dsl::Expr);
+
+impl From<DataFrameExpression> for polars::lazy::dsl::Expr {
+    fn from(source: DataFrameExpression) -> Self {
+        source.0
+    }
+}
+
+impl DataFrameExpression {
+    fn first(&mut self) -> Self {
+        DataFrameExpression(self.0.clone().first())
+    }
+    fn sum(&mut self) -> Self {
+        DataFrameExpression(self.0.clone().sum())
+    }
+    fn mean(&mut self) -> Self {
+        DataFrameExpression(self.0.clone().mean())
+    }
+    fn max(&mut self) -> Self {
+        DataFrameExpression(self.0.clone().max())
+    }
+    fn min(&mut self) -> Self {
+        DataFrameExpression(self.0.clone().min())
+    }
+    fn count(&mut self) -> Self {
+        DataFrameExpression(self.0.clone().count())
+    }
+    fn eq(&mut self, e: rhai::Dynamic) -> Self {
+        DataFrameExpression(self.0.clone().eq(DataFrameExpression::from(e)))
+    }
+
+    fn gt(&mut self, e: rhai::Dynamic) -> Self {
+        DataFrameExpression(self.0.clone().gt(DataFrameExpression::from(e)))
+    }
+    fn lt(&mut self, e: rhai::Dynamic) -> Self {
+        DataFrameExpression(self.0.clone().lt(DataFrameExpression::from(e)))
+    }
+    fn gte(&mut self, e: rhai::Dynamic) -> Self {
+        DataFrameExpression(self.0.clone().gt_eq(DataFrameExpression::from(e)))
+    }
+
+    fn lte(&mut self, e: rhai::Dynamic) -> Self {
+        DataFrameExpression(self.0.clone().lt_eq(DataFrameExpression::from(e)))
+    }
+
+    pub fn filter(&mut self, expr: DataFrameExpression) -> DataFrameExpression {
+        DataFrameExpression(self.0.clone().filter(expr.0))
+    }
+}
+
+impl From<rhai::Dynamic> for DataFrameExpression {
+    fn from(source: rhai::Dynamic) -> Self {
+        match source {
+            x if x.is::<i64>() => DataFrameExpression(x.as_int().unwrap().into()),
+            x if x.is::<f64>() => DataFrameExpression(x.as_float().unwrap().into()),
+            x if x.is::<String>() => DataFrameExpression(x.into_string().unwrap()[..].into()),
+            x if x.is::<bool>() => DataFrameExpression(x.as_bool().unwrap().into()),
+            _ => DataFrameExpression(polars::lazy::dsl::Expr::default()),
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct Series(polars::series::Series);
+
+impl Deref for Series {
+    type Target = polars::series::Series;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl Add for Series {
+    type Output = Series;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Series(self.0 + rhs.0)
+    }
+}
+
+impl Series {
+    pub fn s_head(&mut self, n: i64) -> Series {
+        Series(self.0.head(Some(n as usize)))
+    }
+    pub fn s_sort(&mut self, reverse: bool) -> Series {
+        Series(self.0.sort(reverse))
+    }
+
+    pub fn s_sum(&mut self) -> i64 {
+        self.0.sum().unwrap_or_default()
+    }
+
+    pub fn s_get(&mut self, n: i64) -> ScriptResult<rhai::Dynamic> {
+        let value = self.get(n as usize);
+        match value {
+            polars::datatypes::AnyValue::Utf8(v) => {
+                Ok(rhai::Dynamic::from_str(v).unwrap_or_default())
+            }
+            polars::prelude::AnyValue::Null => Ok(rhai::Dynamic::UNIT),
+            polars::prelude::AnyValue::Boolean(v) => Ok(rhai::Dynamic::from_bool(v)),
+            polars::prelude::AnyValue::UInt8(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::UInt16(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::UInt32(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::UInt64(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::Int8(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::Int16(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::Int32(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::Int64(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::Float32(v) => Ok(rhai::Dynamic::from_float(v as f64)),
+            polars::prelude::AnyValue::Float64(v) => Ok(rhai::Dynamic::from_float(v as f64)),
+            polars::prelude::AnyValue::Date(v) => Ok(rhai::Dynamic::from_int(v as i64)),
+            polars::prelude::AnyValue::Datetime(_, _, _) => Ok(rhai::Dynamic::from_int(0)),
+            polars::prelude::AnyValue::Duration(_, _) => Ok(rhai::Dynamic::from_int(0)),
+            polars::prelude::AnyValue::Time(_) => Ok(rhai::Dynamic::from_int(0)),
+            polars::prelude::AnyValue::List(s) => Ok(rhai::Dynamic::from(Series(s))),
+            polars::prelude::AnyValue::Utf8Owned(v) => {
+                Ok(rhai::Dynamic::from_str(&v).unwrap_or_default())
+            }
+        }
+    }
+
+    pub fn s_op_add(self, series: Series) -> Series {
+        Series(self.0 + series.0)
+    }
+}
+
+mod script_functions {
+    use super::*;
+
+    pub fn add_series_i64(a: Series, b: i64) -> Series {
+        Series(a.0 + b)
+    }
+
+    pub fn add_series_f64(a: Series, b: f64) -> Series {
+        Series(a.0 + b)
+    }
+
+    pub fn subtract_series_i64(a: Series, b: i64) -> Series {
+        Series(a.0 - b)
+    }
+
+    pub fn subtract_series_f64(a: Series, b: f64) -> Series {
+        Series(a.0 - b)
+    }
+
+    pub fn column(name: &str) -> DataFrameExpression {
+        DataFrameExpression(polars::prelude::col(name))
+    }
+
+    pub fn sum(name: &str) -> DataFrameExpression {
+        DataFrameExpression(polars::prelude::sum(name))
+    }
+
+    pub fn min(name: &str) -> DataFrameExpression {
+        DataFrameExpression(polars::prelude::min(name))
+    }
+
+    pub fn max(name: &str) -> DataFrameExpression {
+        DataFrameExpression(polars::prelude::max(name))
+    }
+
+    pub fn mean(name: &str) -> DataFrameExpression {
+        DataFrameExpression(polars::prelude::mean(name))
+    }
+
+    pub fn first() -> DataFrameExpression {
+        DataFrameExpression(polars::prelude::first())
+    }
+
+    pub fn count() -> DataFrameExpression {
+        DataFrameExpression(polars::prelude::count())
+    }
+
+    pub fn dataframe(mp: rhai::Map) -> ScriptResult<DataFrame> {
+        let mut series_vec = vec![];
+
+        for (key, value) in mp.into_iter() {
+            if let Some(array) = value.try_cast::<rhai::Array>() {
+                let s = series(&key, array)?;
+                series_vec.push(s);
+            }
+        }
+
+        if let Ok(df) = polars::frame::DataFrame::new(series_vec.into_iter().map(|i| i.0).collect())
+        {
+            Ok(DataFrame(df))
+        } else {
+            Ok(DataFrame(polars::frame::DataFrame::default()))
+        }
+    }
+
+    pub fn series(name: &str, arr: rhai::Array) -> std::result::Result<Series, Box<EvalAltResult>> {
+        if let Some(i) = arr.first() {
+            let series = if i.type_id() == TypeId::of::<i64>() {
+                polars::series::Series::new(
+                    name,
+                    arr.into_iter()
+                        .map(|i| i.cast::<i64>())
+                        .collect::<Vec<i64>>(),
+                )
+            } else if i.type_id() == TypeId::of::<f64>() {
+                polars::series::Series::new(
+                    name,
+                    arr.into_iter()
+                        .map(|i| i.cast::<f64>())
+                        .collect::<Vec<f64>>(),
+                )
+            } else {
+                polars::series::Series::new(
+                    name,
+                    arr.into_iter()
+                        .map(|i| i.cast::<String>())
+                        .collect::<Vec<String>>(),
+                )
+            };
+            Ok(Series(series))
+        } else {
+            let v: Vec<i64> = vec![];
+            let s = polars::series::Series::new(name, v);
+            Ok(Series(s))
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::engine::tests::process;
+
+    #[test]
+    pub fn simple_dataframe() {
+        let frame = process(r#"dataframe(#{ floats: [1.0, 2.0, 3.0], ints: [1,2,3], strings: ["one", "two", "three"]  }) "#).into_frame();
+        let s = frame
+            .column("floats")
+            .unwrap()
+            .f64()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(1.), Some(2.), Some(3.)]);
+
+        let s = frame
+            .column("ints")
+            .unwrap()
+            .i64()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(1), Some(2), Some(3)]);
+
+        let s = frame
+            .column("strings")
+            .unwrap()
+            .utf8()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some("one"), Some("two"), Some("three")]);
+    }
+
+    #[test]
+    pub fn dataframe_get_column() {
+        let series =
+            process(r#"dataframe(#{ item: [1.0, 2.0, 3.0] }).column("item") "#).into_series();
+        let s = series.f64().unwrap().into_iter().collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(1.), Some(2.), Some(3.)]);
+    }
+
+    #[test]
+    pub fn simple_series() {
+        let series = process(r#"series("ages;", [18.,21.,25.,35.])"#).into_series();
+        let s = series.f64().unwrap().into_iter().collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(18.), Some(21.), Some(25.), Some(35.)]);
+    }
+
+    #[test]
+    pub fn series_head() {
+        let series = process(r#"series("ages", [18.,21.,25.,35.]).head(1)"#).into_series();
+        let s = series.f64().unwrap().into_iter().collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(18.)]);
+    }
+
+    #[test]
+    pub fn series_sort() {
+        let series =
+            process(r#"series("ages", [18.,21.,25.,35.]).sort(true).head(1)"#).into_series();
+        let s = series.f64().unwrap().into_iter().collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(35.)]);
+    }
+
+    #[test]
+    pub fn series_index() {
+        let s = process(r#"series("ages", [18, 21, 25, 35]).sort(true)[1]"#).into_scalar();
+        assert_eq!(s.cast::<i64>(), 25);
+    }
+
+    #[test]
+    pub fn series_add() {
+        let series = process(
+            r#"
+let s1 = series("ages", [1, 1, 1, 1]);
+let s2 = series("ages", [18, 21, 25, 35]);
+s1 + s2
+"#,
+        )
+        .into_series();
+        let s = series.i64().unwrap().into_iter().collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(19), Some(22), Some(26), Some(36)]);
+    }
+
+    #[test]
+    pub fn test_load_csv() {
+        let series =
+            process(r#"load_csv("test/data.csv").column("age").sort(true).head(1)"#).into_series();
+        let s = series.i64().unwrap().into_iter().collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(32)]);
+    }
+
+    #[test]
+    pub fn test_dataframe_select() {
+        let res = process(r#" let data = load_csv("test/data.csv"); data.select([sum("age")]) "#)
+            .into_frame();
+        let s = res
+            .column("age")
+            .unwrap()
+            .i64()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(72)]);
+
+        let res = process(r#" let data = load_csv("test/data.csv"); data.select([min("age")]) "#)
+            .into_frame();
+        let s = res
+            .column("age")
+            .unwrap()
+            .i64()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(18)]);
+
+        let res = process(r#" let data = load_csv("test/data.csv"); data.select([max("age")]) "#)
+            .into_frame();
+        let s = res
+            .column("age")
+            .unwrap()
+            .i64()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(32)]);
+
+        let res = process(r#" let data = load_csv("test/data.csv"); data.select([mean("age")]) "#)
+            .into_frame();
+        let s = res
+            .column("age")
+            .unwrap()
+            .f64()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(24.0)]);
+    }
+
+    #[test]
+    pub fn test_dataframe_filter() {
+        let res = process(r#" let data = load_csv("test/data.csv"); data.select([column("age").filter(column("age").eq(18)).sum()]) "#)
+            .into_frame();
+        let s = res
+            .column("age")
+            .unwrap()
+            .i64()
+            .unwrap()
+            .into_iter()
+            .collect::<Vec<_>>();
+        assert_eq!(s, vec![Some(18)]);
+    }
+}
diff --git a/abacus-core/src/engine.rs b/abacus-core/src/engine.rs
new file mode 100644
index 0000000..7a17714
--- /dev/null
+++ b/abacus-core/src/engine.rs
@@ -0,0 +1,100 @@
+use crate::dataframe;
+
+#[derive(Debug)]
+pub struct Engine {
+    pub blocks: Vec<Block>,
+    engine: rhai::Engine,
+}
+
+impl Default for Engine {
+    fn default() -> Self {
+        let mut engine = rhai::Engine::new();
+        engine.set_fast_operators(false);
+        dataframe::setup_engine(&mut engine);
+
+        Self {
+            engine,
+            blocks: vec![Block::default()],
+        }
+    }
+}
+
+impl Engine {
+    pub fn process(&mut self) {
+        for block in self.blocks.iter_mut() {
+            match self.engine.eval::<rhai::Dynamic>(&block.script) {
+                Ok(res) if res.is::<dataframe::DataFrame>() => {
+                    let frame = rhai::Dynamic::cast::<dataframe::DataFrame>(res);
+                    block.output = Output::DataFrame(frame);
+                }
+                Ok(res) if res.is::<dataframe::Series>() => {
+                    let frame = rhai::Dynamic::cast::<dataframe::Series>(res);
+                    block.output = Output::Series(frame);
+                }
+                Ok(res) => {
+                    block.output = Output::Scalar(res);
+                }
+                Err(e) => {
+                    block.output = Output::Error(e.to_string());
+                }
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub enum Output {
+    None,
+    Scalar(rhai::Dynamic),
+    DataFrame(dataframe::DataFrame),
+    Series(dataframe::Series),
+    Error(String),
+}
+
+impl Output {
+    pub fn into_frame(self) -> dataframe::DataFrame {
+        if let Self::DataFrame(v) = self {
+            return v;
+        }
+        panic!("Not a dataframe");
+    }
+    pub fn into_series(self) -> dataframe::Series {
+        if let Self::Series(v) = self {
+            return v;
+        }
+        panic!("Not a series");
+    }
+    pub fn into_scalar(self) -> rhai::Dynamic {
+        if let Self::Scalar(v) = self {
+            return v;
+        }
+        panic!("Not a scalar");
+    }
+}
+
+#[derive(Debug)]
+pub struct Block {
+    pub script: String,
+    pub output: Output,
+}
+
+impl Default for Block {
+    fn default() -> Self {
+        Self {
+            script: Default::default(),
+            output: Output::None,
+        }
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    pub fn process(script: &str) -> Output {
+        let mut engine = Engine::default();
+        engine.blocks[0].script = script.into();
+        engine.process();
+        engine.blocks[0].output.clone()
+    }
+}
diff --git a/abacus-core/src/lib.rs b/abacus-core/src/lib.rs
new file mode 100644
index 0000000..ee4f77d
--- /dev/null
+++ b/abacus-core/src/lib.rs
@@ -0,0 +1,7 @@
+mod dataframe;
+mod engine;
+
+pub use engine::Engine;
+
+use rhai::EvalAltResult;
+type ScriptResult<T> = std::result::Result<T, Box<EvalAltResult>>;
diff --git a/abacus-ui/Cargo.toml b/abacus-ui/Cargo.toml
new file mode 100644
index 0000000..6cdea7d
--- /dev/null
+++ b/abacus-ui/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "abacus-ui"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+druid = { git = "https://github.com/linebender/druid.git" }
+abacus-core = { path = "../abacus-core" }
\ No newline at end of file
diff --git a/abacus-ui/src/editor.rs b/abacus-ui/src/editor.rs
new file mode 100644
index 0000000..b96dc32
--- /dev/null
+++ b/abacus-ui/src/editor.rs
@@ -0,0 +1,160 @@
+use druid::{
+    piet::{Text, TextLayout, TextLayoutBuilder},
+    Color, Data, Event, FontFamily, Lens, LifeCycle, RenderContext, Widget,
+};
+
+#[derive(Clone, Data, PartialEq, Eq)]
+pub enum EditMode {
+    Normal,
+    Insert,
+}
+
+pub struct AbacusEditor;
+
+#[derive(Data, Lens, Clone)]
+pub struct EditorData {
+    pub raw_content: String,
+    pub cursor_pos: usize,
+    pub mode: EditMode,
+}
+
+impl Default for EditorData {
+    fn default() -> Self {
+        Self {
+            raw_content: "let x = 1;\nx+1".to_string(),
+            cursor_pos: 5,
+            mode: EditMode::Normal,
+        }
+    }
+}
+
+impl EditorData {
+    pub fn push_str(&mut self, s: &str) {
+        self.raw_content.push_str(s);
+        self.cursor_to_end();
+    }
+
+    pub fn push(&mut self, c: char) {
+        self.raw_content.push(c);
+        self.cursor_to_end();
+    }
+
+    pub fn cursor_to_end(&mut self) {
+        self.cursor_pos = self.raw_content.len();
+    }
+
+    pub fn delete_char_back(&mut self) {
+        self.raw_content.pop();
+        self.cursor_to_end();
+    }
+}
+
+impl Widget<EditorData> for AbacusEditor {
+    fn paint(&mut self, ctx: &mut druid::PaintCtx, data: &EditorData, env: &druid::Env) {
+        let size = ctx.size();
+        let rect = size.to_rect();
+
+        if ctx.is_focused() {
+            ctx.fill(rect, &Color::rgb8(10, 10, 10));
+        } else {
+            ctx.fill(rect, &Color::rgb8(20, 20, 20));
+        }
+
+        let layout = ctx
+            .text()
+            .new_text_layout(data.raw_content.clone())
+            .font(FontFamily::MONOSPACE, 24.0)
+            .text_color(Color::rgb8(255, 255, 255))
+            .build()
+            .unwrap();
+
+        dbg!(layout.rects_for_range((data.cursor_pos - 1)..data.cursor_pos));
+        ctx.fill(
+            layout
+                .rects_for_range((data.cursor_pos - 1)..data.cursor_pos)
+                .last()
+                .unwrap(),
+            &Color::rgb8(50, 50, 50),
+        );
+        ctx.draw_text(&layout, (1.0, 1.0));
+
+        dbg!(ctx.is_focused());
+    }
+
+    fn event(
+        &mut self,
+        ctx: &mut druid::EventCtx,
+        event: &druid::Event,
+        data: &mut EditorData,
+        env: &druid::Env,
+    ) {
+        match event {
+            Event::KeyUp(e) => match &e.key {
+                druid::keyboard_types::Key::Character(c) => {
+                    data.push_str(c);
+                    ctx.request_paint();
+                }
+                druid::keyboard_types::Key::Enter => {
+                    data.push('\n');
+                    ctx.request_paint();
+                }
+                druid::keyboard_types::Key::Backspace => {
+                    data.delete_char_back();
+                    ctx.request_paint();
+                }
+                druid::keyboard_types::Key::Escape => {
+                    data.mode == EditMode::Normal;
+                }
+                e => {
+                    dbg!(e);
+                }
+            },
+            Event::MouseDown(_) => {
+                if !ctx.is_focused() {
+                    ctx.request_focus();
+                }
+            }
+            _ => {}
+        }
+    }
+
+    fn lifecycle(
+        &mut self,
+        ctx: &mut druid::LifeCycleCtx,
+        event: &druid::LifeCycle,
+        data: &EditorData,
+        env: &druid::Env,
+    ) {
+        match event {
+            LifeCycle::FocusChanged(_) => {
+                ctx.request_paint();
+            }
+            LifeCycle::WidgetAdded => {
+                // ctx.register_text_input(document)
+            }
+            LifeCycle::BuildFocusChain => {
+                ctx.register_for_focus();
+            }
+            _ => {}
+        }
+    }
+
+    fn update(
+        &mut self,
+        ctx: &mut druid::UpdateCtx,
+        old_data: &EditorData,
+        data: &EditorData,
+        env: &druid::Env,
+    ) {
+    }
+
+    fn layout(
+        &mut self,
+        ctx: &mut druid::LayoutCtx,
+        bc: &druid::BoxConstraints,
+        data: &EditorData,
+        env: &druid::Env,
+    ) -> druid::Size {
+        bc.max()
+    }
+}
diff --git a/abacus-ui/src/main.rs b/abacus-ui/src/main.rs
new file mode 100644
index 0000000..aeac267
--- /dev/null
+++ b/abacus-ui/src/main.rs
@@ -0,0 +1,35 @@
+mod editor;
+
+use druid::widget::{Align, Flex, Label, Padding, RawLabel};
+use druid::{AppLauncher, Color, Data, PlatformError, Widget, WidgetExt, WindowDesc};
+use editor::EditorData;
+
+fn build_ui() -> impl Widget<editor::EditorData> {
+    Padding::new(
+        10.0,
+        Flex::row()
+            .with_flex_child(
+                Flex::column().with_flex_child(editor::AbacusEditor, 1.0),
+                1.0,
+            )
+            .with_flex_child(
+                Flex::column()
+                    .with_flex_child(
+                        Label::new("top right").background(Color::rgb8(0, 0, 255)),
+                        1.0,
+                    )
+                    .with_flex_child(Align::centered(Label::new("bottom right")), 1.0),
+                1.0,
+            ),
+    )
+}
+
+fn main() -> Result<(), PlatformError> {
+    AppLauncher::with_window(WindowDesc::new(build_ui())).launch(editor::EditorData::default())?;
+    Ok(())
+}
+
+#[derive(Clone, Data)]
+struct CodeEditor {
+    code: String,
+}