Add WASM support (#14)

.gitignore

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+/pkg/
 /target/
 **/*.rs.bk
 
@@ -31,6 +32,7 @@ out/
 *.bak
 *.tmp
 *.class
+*.html
 .buildpath
 .classpath
 .vscode/*
@@ -49,4 +51,4 @@ $RECYCLE.BIN/
 Desktop.ini
 ehthumbs.db
 
-src/main.rs
+src/main.rs

Cargo.toml

@@ -17,7 +17,7 @@ members = ["language-models/*"]
 
 [package]
 name = "lingua"
-version = "1.3.3"
+version = "1.4.0-SNAPSHOT"
 authors = ["Peter M. Stahl <pemistahl@gmail.com>"]
 description = """
 An accurate natural language detection library, suitable for long and short text alike
@@ -36,6 +36,9 @@ keywords = [
     "nlp"
 ]
 
+[lib]
+crate-type = ["cdylib", "rlib"]
+
 [dependencies]
 fraction = "0.10.0"
 include_dir = "0.7.2"
@@ -125,6 +128,9 @@ lingua-xhosa-language-model = { path = "language-models/xh", version = "=1.0.1",
 lingua-yoruba-language-model = { path = "language-models/yo", version = "=1.0.1", optional = true }
 lingua-zulu-language-model = { path = "language-models/zu", version = "=1.0.1", optional = true }
 
+[target.'cfg(target_family = "wasm")'.dependencies]
+wasm-bindgen = { version = "0.2", features = ["serde-serialize"] }
+
 [dev-dependencies]
 cld2 = "1.0.2"
 float-cmp = "0.9.0"
@@ -136,8 +142,9 @@ titlecase = "1.1.0"
 whatlang = "0.13.0"
 
 [features]
-default = [
-    "parallelism",
+default = ["parallelism", "all-languages"]
+parallelism = ["rayon"]
+all-languages = [
     "afrikaans", "albanian", "arabic", "armenian", "azerbaijani", "basque",
     "belarusian", "bengali", "bokmal", "bosnian", "bulgarian", "catalan",
     "chinese", "croatian", "czech", "danish", "dutch", "english", "esperanto",
@@ -151,7 +158,6 @@ default = [
     "tsonga", "tswana", "turkish", "ukrainian", "urdu", "vietnamese",
     "welsh", "xhosa", "yoruba", "zulu"
 ]
-parallelism = ["rayon"]
 afrikaans = ["lingua-afrikaans-language-model"]
 albanian = ["lingua-albanian-language-model"]
 arabic = ["lingua-arabic-language-model"]

src/builder.rs

@@ -19,7 +19,11 @@ use crate::isocode::{IsoCode639_1, IsoCode639_3};
 use crate::language::Language;
 use std::collections::HashSet;
 
-const MISSING_LANGUAGE_MESSAGE: &str = "LanguageDetector needs at least 2 languages to choose from";
+pub(crate) const MISSING_LANGUAGE_MESSAGE: &str =
+    "LanguageDetector needs at least 2 languages to choose from";
+
+pub(crate) const MINIMUM_RELATIVE_DISTANCE_MESSAGE: &str =
+    "Minimum relative distance must lie in between 0.0 and 0.99";
 
 /// This struct configures and creates an instance of [LanguageDetector].
 pub struct LanguageDetectorBuilder {
@@ -141,7 +145,7 @@ impl LanguageDetectorBuilder {
     /// ⚠ Panics if `distance` is smaller than 0.0 or greater than 0.99.
     pub fn with_minimum_relative_distance(&mut self, distance: f64) -> &mut Self {
         if !(0.0..=0.99).contains(&distance) {
-            panic!("minimum relative distance must lie in between 0.0 and 0.99");
+            panic!("{}", MINIMUM_RELATIVE_DISTANCE_MESSAGE);
         }
         self.minimum_relative_distance = distance;
         self
@@ -303,13 +307,13 @@ mod tests {
     }
 
     #[test]
-    #[should_panic(expected = "minimum relative distance must lie in between 0.0 and 0.99")]
+    #[should_panic(expected = "Minimum relative distance must lie in between 0.0 and 0.99")]
     fn assert_detector_cannot_be_built_from_too_small_minimum_relative_distance() {
         LanguageDetectorBuilder::from_all_languages().with_minimum_relative_distance(-2.3);
     }
 
     #[test]
-    #[should_panic(expected = "minimum relative distance must lie in between 0.0 and 0.99")]
+    #[should_panic(expected = "Minimum relative distance must lie in between 0.0 and 0.99")]
     fn assert_detector_cannot_be_built_from_too_large_minimum_relative_distance() {
         LanguageDetectorBuilder::from_all_languages().with_minimum_relative_distance(1.7);
     }

src/lib.rs

@@ -281,6 +281,9 @@ mod model;
 mod ngram;
 mod writer;
 
+#[cfg(target_family = "wasm")]
+mod wasm;
+
 pub use builder::LanguageDetectorBuilder;
 pub use detector::LanguageDetector;
 pub use isocode::{IsoCode639_1, IsoCode639_3};