fmeringdal · dgmachado · May 11, 2023 · May 13, 2023 · May 17, 2023 · May 17, 2023
diff --git a/Cargo.toml b/Cargo.toml
@@ -6,7 +6,7 @@ rust-version = "1.64.0"
 [workspace]
 members = [
     "rrule",
-    "rrule-debugger",
+    "rrule-debugger"
 ]
 
 # These are the 2 packages to mainly work on.

diff --git a/rrule/Cargo.toml b/rrule/Cargo.toml
@@ -21,10 +21,14 @@ regex = { version = "1.5.5", default-features = false, features = ["perf", "std"
 clap = { version = "4.1.9", optional = true, features = ["derive"] }
 thiserror = "1.0.30"
 serde_with = { version = "2.3.1", optional = true }
+#[cfg(feature = "wasm")]
+wasm-bindgen = { version="0.2.85" }
 
 [dev-dependencies]
 serde_json = "1.0.80"
 orig_serde = { package = "serde", version = "1.0.137", default-features = false }
+#[cfg(feature = "wasm")]
+wasm-bindgen-test = "0.3.13"
 
 [[bin]]
 name = "rrule"
@@ -43,4 +47,11 @@ cli-tool = ["clap"]
 serde = ["serde_with", "chrono/serde", "chrono-tz/serde"]
 
 # Allows EXRULE's to be used in the `RRuleSet`.
-exrule = []
+exrule = []
+
+# Allows to use WASM
+wasm = []
+
+[lib]
+#[cfg(feature = "wasm")]
+crate-type = ["cdylib", "rlib"] 
diff --git a/rrule/Makefile b/rrule/Makefile
@@ -0,0 +1,14 @@
+install-wasm-pack:
+	curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+
+build-wasm-nodejs:
+	wasm-pack build --target nodejs --features "wasm"
+
+test-wasm-on-nodejs:
+	node examples/wasm/nodejs/app.js
+
+build-wasm-web:
+	wasm-pack build --target web --features "wasm"
+
+test-wasm-on-web-browser:
+	npx http-server -o /examples/wasm/web/index.html
diff --git a/rrule/examples/wasm/nodejs/app.js b/rrule/examples/wasm/nodejs/app.js
@@ -0,0 +1,21 @@
+const { get_all_date_recurrences } = require('../../../pkg/rrule.js');
+
+const http = require('http');
+const url = require('url');
+const hostname = '127.0.0.1';
+const port = 3000;
+
+const server = http.createServer((req, res) => {
+  const queryObject = url.parse(req.url,true).query;
+  res.statusCode = 200;
+  res.setHeader('Content-Type', 'text/plain');
+
+  const rule_set = "DTSTART:20120201T093000Z\nRRULE:FREQ=DAILY;COUNT=3";
+  const data = get_all_date_recurrences(rule_set, 100);
+  console.log(data);
+  res.end(data.toString());
+});
+
+server.listen(port, hostname, () => {
+  console.log(`Server running at http://${hostname}:${port}/`);
+});
diff --git a/rrule/examples/wasm/web/index.html b/rrule/examples/wasm/web/index.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta content="text/html;charset=utf-8" http-equiv="Content-Type"/>
+    <meta http-equiv="cache-control" content="max-age=0" />
+    <meta http-equiv="cache-control" content="no-cache" />
+  </head>
+  <body>
+
+    <script type="module">
+      import init, { get_all_date_recurrences } from '../../../pkg/rrule.js';
+
+      async function run_wasm() {
+        await init();
+        const rule_set = "DTSTART:20120201T093000Z\nRRULE:FREQ=DAILY;COUNT=3";
+        const data = get_all_date_recurrences(rule_set, 100);
+        console.log(data);
+        alert(data);
+      }
+      run_wasm();
+    </script>
+  </body>
+</html>
diff --git a/rrule/src/lib.rs b/rrule/src/lib.rs
@@ -99,6 +99,8 @@ mod iter;
 mod parser;
 mod tests;
 mod validator;
+#[cfg(feature = "wasm")]
+mod wasm;
 
 pub use crate::core::{Frequency, NWeekday, RRule, RRuleResult, RRuleSet, Tz};
 pub use crate::core::{Unvalidated, Validated};

diff --git a/rrule/src/wasm/mod.rs b/rrule/src/wasm/mod.rs
@@ -0,0 +1,33 @@
+#![allow(
+    clippy::cast_possible_truncation,
+    clippy::doc_markdown,
+    clippy::unwrap_used
+)]
+
+use wasm_bindgen::prelude::*;
+
+use crate::{RRuleSet, RRuleError};
+
+/**
+  Get all recurrences of the rrule!
+     rule_set_string: List of rrules
+     limit: Limit must be set in order to prevent infinite loops
+*/
+#[wasm_bindgen]
+pub fn get_all_date_recurrences(rule_set: &str, limit: Option<u16>) -> Result<Vec<JsValue>, JsError> {
+    let rrule_result: Result<RRuleSet, RRuleError> = rule_set.parse();
+    match rrule_result {
+        Ok(rrule) =>  {
+            //  Set hard limit in case of infinitely recurring rules
+            let rule_set_collection = rrule.all(limit.unwrap_or(100));
+            let result: Vec<JsValue> = rule_set_collection.dates
+                .into_iter()
+                .map(|s| {
+                    JsValue::from_str(&s.to_string())
+                })
+                .collect();
+            Ok(result)      
+        },
+        Err(e) => Err(JsError::from(e))
+    }
+}