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https://github.com/fluencelabs/wasm-bindgen
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String - substr() support
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@ -340,6 +340,14 @@ extern {
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/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice
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#[wasm_bindgen(method, js_class = "String")]
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pub fn slice(this: &JsString, start: u32, end: u32) -> JsString;
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/// The substr() method returns the part of a string between
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/// the start index and a number of characters after it.
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///
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/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr
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/// TODO: Add `NaN` and `undefined` support
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#[wasm_bindgen(method, js_class = "String")]
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pub fn substr(this: &JsString, start: i32, length: i32) -> JsString;
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}
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impl<'a> From<&'a str> for JsString {
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@ -30,3 +30,39 @@ fn slice() {
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"#)
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.test()
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}
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#[test]
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fn substr() {
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project()
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.file("src/lib.rs", r#"
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#![feature(proc_macro, wasm_custom_section)]
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extern crate wasm_bindgen;
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use wasm_bindgen::prelude::*;
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use wasm_bindgen::js;
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#[wasm_bindgen]
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pub fn create_substr(this: &js::JsString, start: i32, length: i32) -> js::JsString {
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this.substr(start, length)
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}
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"#)
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.file("test.ts", r#"
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import * as assert from "assert";
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import * as wasm from "./out";
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export function test() {
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let aString = "Mozilla";
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assert.equal(wasm.create_substr(aString, 0, 1), "M");
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assert.equal(wasm.create_substr(aString, 1, 0), "");
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assert.equal(wasm.create_substr(aString, -1, 1), "a");
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assert.equal(wasm.create_substr(aString, 1, -1), "");
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// TODO: Uncomment and test these assertions, once we have support for optional parameters
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// assert.equal(wasm.create_substr(aString, -3), "lla");
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// assert.equal(wasm.create_substr(aString, 1), "ozilla");
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assert.equal(wasm.create_substr(aString, -20, 2), "Mo");
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assert.equal(wasm.create_substr(aString, 20, 2), "");
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}
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"#)
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.test()
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}
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