vidyasagarv.com
A typst plugin for unit-aware calculations
typst
Rename to evaltor and use fend backend for now
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Cargo.lock
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Cargo.lock
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version = 4
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[[package]]
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name = "numbat-typst"
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name = "evaltor"
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version = "0.1.0"
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dependencies = [
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"fend-core",
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"typst-wasm-protocol",
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]
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[[package]]
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name = "fend-core"
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version = "1.5.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3f775cab5068a34b942b110dcb11f42c96d376b681c45e604884da6059cb9d2c"
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[[package]]
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name = "proc-macro2"
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Cargo.toml
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Cargo.toml
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README.md
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README.md
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# Typst plugin for [numbat](https://numbat.dev)
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# Evaltor: Typst plugin for unit-aware calculations
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I initially wanted to use [numbat](https://github.com/sharkdp/numbat) but since it requires access to filesystem I ended up choosing [fend](https://printfn.github.io/fend) as the backend. Maybe one day I will try to implement InMemory module importer where all the nbt files are imported at compilation.
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Built using [typst-wasm](https://github.com/sjfhsjfh/typst-wasm).
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First compile the rust code to WASM using:
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```sh
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rustup target add wasm32-unknown-unknown
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cargo build --target wasm32-unknown-unknown --release
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```
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···
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Then just load the functions like:
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```typ
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#import "@local/numbat:0.1.0": to_uppercase
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#import "@local/evaltor:0.1.0": print_eval
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```
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src/lib.rs
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src/lib.rs
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use std::str;
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use typst_wasm_protocol::wasm_export;
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// Simple string operation function
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#[wasm_export]
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fn to_uppercase(input: &[u8]) -> Vec<u8> {
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let input_str = match str::from_utf8(input) {
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Ok(s) => s,
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Err(_) => return b"Invalid UTF-8 input".to_vec(),
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};
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input_str.to_uppercase().into_bytes()
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}
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// Using custom export name
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#[wasm_export(export_rename = "count_chars")]
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fn count_characters(input: &[u8]) -> Vec<u8> {
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let input_str = match str::from_utf8(input) {
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Ok(s) => s,
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Err(_) => return b"Invalid UTF-8 input".to_vec(),
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};
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format!("Character count: {}", input_str.chars().count()).into_bytes()
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}
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// Function returning Result type
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#[wasm_export]
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fn divide_numbers(input: &[u8]) -> Result<String, String> {
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let input_str = str::from_utf8(input).map_err(|e| format!("UTF-8 error: {}", e))?;
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let numbers: Vec<&str> = input_str.split(',').collect();
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if numbers.len() != 2 {
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return Err("Expected two comma-separated numbers".to_string());
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}
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let a: f64 = numbers[0]
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.trim()
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.parse()
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.map_err(|_| "First value is not a valid number".to_string())?;
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let b: f64 = numbers[1]
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.trim()
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.parse()
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.map_err(|_| "Second value is not a valid number".to_string())?;
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if b == 0.0 {
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return Err("Cannot divide by zero".to_string());
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fn fend_evaluate(query: &[u8]) -> Result<String, String> {
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let input = str::from_utf8(query).map_err(|e| format!("UTF-8 error: {}", e))?;
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let mut ctx = fend_core::Context::new();
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let mut result = String::new();
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match fend_core::evaluate(input, &mut ctx) {
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Ok(res) => {
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if !res.output_is_empty() {
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result.push_str(res.get_main_result());
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}
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}
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Err(msg) => {
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return Err(format!("Error: {msg}"));
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}
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}
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let result = a / b;
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Ok(format!("Result: {:.2}", result))
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}
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// Function returning Result<String, String> type
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#[wasm_export]
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fn validate_email(input: &[u8]) -> Result<String, String> {
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let email = str::from_utf8(input)
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.map_err(|e| format!("UTF-8 error: {}", e))?
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.trim();
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// Simple email validation
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if !email.contains('@') || !email.contains('.') {
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return Err("Invalid email format".to_string());
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}
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Ok("Email is valid".to_string())
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Ok(result.to_string())
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}
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src/lib.typ
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src/lib.typ
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// Should compile numbat_typst.wasm first
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// using:
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#import plugin("../target/wasm32-unknown-unknown/release/numbat_typst.wasm"): to_uppercase, count_chars, divide_numbers, validate_email
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#import plugin("../target/wasm32-unknown-unknown/release/evaltor.wasm"):fend_evaluate
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#let print_eval(input) = {
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let output = str(fend_evaluate(bytes(input)))
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[#input = #output]
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}
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tests/examples.typ
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tests/examples.typ
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#import "@local/numbat:0.1.0": to_uppercase, count_chars, divide_numbers, validate_email
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#import "@local/evaltor:0.1.0": print_eval
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= Tests
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#show heading: it => {
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it.body
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v(1pt)
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}
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#set text(size:16pt)
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Hi there!
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= `print_eval` with `fend` backend
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#let input = "Hello, Typst!"
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It will print the input along with its result, calculated using `fend` backend, which is unit-aware.
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// Call the to_uppercase function
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#let uppercase = str(to_uppercase(bytes(input)))
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Original: #input\
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Uppercase: #uppercase
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Some examples:
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// Call the count_chars function (note this is exported with a custom name)
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#let char_count = str(count_chars(bytes(input)))
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#char_count
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#print_eval("2 km + 30 m")
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// Call a function that returns a Result type
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#let division_result = str(divide_numbers(bytes("10,2")))
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#division_result
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#print_eval("1 ft to cm")
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// Handle potential errors, uncomment to see the error handling in action
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// #let division_error = divide_numbers(bytes("10,0"))
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#print_eval("5'7\" to cm")
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#print_eval("cos (pi/4) + i * (sin (pi/4))")
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// Use a function with Result<String, String> type
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#let email_valid = str(validate_email(bytes("user@example.com")))
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Email validation: #email_valid
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#print_eval("0b1001 + 3")
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#print_eval("0xffff to decimal")
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#print_eval("100 C to F")
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#print_eval("temperature = 30 °C; temperature to °F")
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#print_eval("(10um)/(0.334cm) + (0.6mm)/(35.28cm) + (1mm)/(47.57cm) + (0.4mm)/(35.28cm) + (2um)/(3.56cm) to percent")
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*Currently, random numbers are not available.*