Misc wasm bindings (#295)

Mint::as_positive_multiasset()/as_negative_multiasset()

deposit.rs (excluding internal functions - why are these public?)

min_ada.rs

Still missing genesis but that is more work (discussed previously)

chain/wasm/src/assets/utils.rs

@@ -193,6 +193,16 @@ impl Mint {
             .map(Into::into)
             .map_err(Into::into)
     }
+
+    /// Returns the multiasset where only positive (minting) entries are present
+    pub fn as_positive_multiasset(&self) -> MultiAsset {
+        self.0.as_positive_multiasset().into()
+    }
+
+    /// Returns the multiasset where only negative (burning) entries are present
+    pub fn as_negative_multiasset(&self) -> MultiAsset {
+        self.0.as_negative_multiasset().into()
+    }
 }
 
 impl_wasm_conversions!(cml_chain::assets::Mint, Mint);

chain/wasm/src/deposit.rs

@@ -0,0 +1,26 @@
+use wasm_bindgen::prelude::{wasm_bindgen, JsError};
+
+use crate::{
+    assets::{Coin, Value},
+    transaction::TransactionBody,
+};
+
+#[wasm_bindgen]
+pub fn get_implicit_input(
+    txbody: &TransactionBody,
+    pool_deposit: Coin, // // protocol parameter
+    key_deposit: Coin,  // protocol parameter
+) -> Result<Value, JsError> {
+    cml_chain::deposit::get_implicit_input(txbody.as_ref(), pool_deposit, key_deposit)
+        .map(Into::into)
+        .map_err(Into::into)
+}
+
+#[wasm_bindgen]
+pub fn get_deposit(
+    txbody: &TransactionBody,
+    pool_deposit: Coin, // // protocol parameter
+    key_deposit: Coin,  // protocol parameter
+) -> Result<Coin, JsError> {
+    cml_chain::deposit::get_deposit(txbody.as_ref(), pool_deposit, key_deposit).map_err(Into::into)
+}

chain/wasm/src/lib.rs

@@ -18,9 +18,11 @@ pub mod builders;
 pub mod byron;
 pub mod certs;
 pub mod crypto;
+pub mod deposit;
 pub mod fees;
 pub mod governance;
 pub mod json;
+pub mod min_ada;
 pub mod plutus;
 pub mod transaction;
 pub mod utils;

chain/wasm/src/min_ada.rs

@@ -0,0 +1,11 @@
+use wasm_bindgen::prelude::{wasm_bindgen, JsError};
+
+use crate::{assets::Coin, transaction::TransactionOutput};
+
+#[wasm_bindgen]
+pub fn min_ada_required(
+    output: &TransactionOutput,
+    coins_per_utxo_byte: Coin, // protocol parameter (in lovelace)
+) -> Result<Coin, JsError> {
+    cml_chain::min_ada::min_ada_required(output.as_ref(), coins_per_utxo_byte).map_err(Into::into)
+}