feat: wasm

Signed-off-by: Chang Wang <[email protected]>

Author: cheapsteak

.gitignore

@@ -2,6 +2,8 @@
 # will have compiled files and executables
 /target/
 
+wasm/target
+
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
 Cargo.lock

wasm/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "css-inline-wasm"
+version = "0.3.0"
+authors = ["Dmitry Dygalo <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+name = "css_inline"
+crate-type = ["cdylib"]
+
+[dependencies.css-inline]
+path = ".."
+version = "= 0.3.3"
+default-features = false
+
+[dependencies]
+url = "2"
+wasm-bindgen = "0.2"

wasm/src/lib.rs

@@ -0,0 +1,47 @@
+use css_inline as rust_inline;
+use wasm_bindgen::prelude::*;
+use std::borrow::Cow;
+
+struct InlineErrorWrapper(rust_inline::InlineError);
+
+impl From<InlineErrorWrapper> for JsValue {
+    fn from(error: InlineErrorWrapper) -> Self {
+        JsValue::from_str(error.0.to_string().as_str())
+    }
+}
+
+struct UrlError(url::ParseError);
+
+impl From<UrlError> for JsValue {
+    fn from(error: UrlError) -> Self {
+        wasm_bindgen::throw_str(&error.0.to_string())
+    }
+}
+
+fn parse_url(url: Option<String>) -> Result<Option<url::Url>, JsValue> {
+    Ok(if let Some(url) = url {
+        Some(url::Url::parse(url.as_str()).map_err(UrlError)?)
+    } else {
+        None
+    })
+}
+
+#[wasm_bindgen]
+pub fn inline(
+    html: &str,
+    inline_style_tags: Option<bool>,
+    remove_style_tags: Option<bool>,
+    base_url: Option<String>,
+    load_remote_stylesheets: Option<bool>,
+    extra_css: Option<String>,
+) -> Result<String, JsValue> {
+    let options = rust_inline::InlineOptions {
+        inline_style_tags: inline_style_tags.unwrap_or(true),
+        remove_style_tags: remove_style_tags.unwrap_or(false),
+        base_url: parse_url(base_url)?,
+        load_remote_stylesheets: load_remote_stylesheets.unwrap_or(true),
+        extra_css: extra_css.map(Cow::Owned),
+    };
+    let inliner = rust_inline::CSSInliner::new(options);
+    Ok(inliner.inline(html).map_err(InlineErrorWrapper)?)
+}