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String - startsWith/substring/indexOf

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This commit is contained in:
Lachezar Lechev 2018-06-25 21:30:04 +02:00
parent 09cf02d41a
commit 36e79d23c4
2 changed files with 136 additions and 5 deletions
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32
src/js.rs
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@ -341,6 +341,21 @@ extern {
#[wasm_bindgen(js_name = JsString)]
pub type JsString;
/// The String object's charAt() method returns a new string consisting of the single
/// UTF-16 code unit located at the specified offset into the string.
///
/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charAt
#[wasm_bindgen(method, js_class = "String", js_name = charAt)]
pub fn char_at(this: &JsString, index: u32) -> JsString;
/// The indexOf() method returns the index within the calling String object of
/// the first occurrence of the specified value, starting the search at fromIndex.
/// Returns -1 if the value is not found.
///
/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf
#[wasm_bindgen(method, js_class = "String", js_name = indexOf)]
pub fn index_of(this: &JsString, search_value: &JsString, from_index: i32) -> i32;
/// The slice() method extracts a section of a string and returns it as a
/// new string, without modifying the original string.
///
@ -348,12 +363,19 @@ extern {
#[wasm_bindgen(method, js_class = "String")]
pub fn slice(this: &JsString, start: u32, end: u32) -> JsString;
/// The String object's charAt() method returns a new string consisting of the single
/// UTF-16 code unit located at the specified offset into the string.
/// The startsWith() method determines whether a string begins with the characters
/// of a specified string, returning true or false as appropriate.
///
/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charAt
#[wasm_bindgen(method, js_class = "String", js_name = charAt)]
pub fn char_at(this: &JsString, index: u32) -> JsString;
/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
#[wasm_bindgen(method, js_class = "String", js_name = startsWith)]
pub fn starts_with(this: &JsString, search_string: &JsString, position: u32) -> bool;
/// The substring() method returns the part of the string between the start and end indexes,
/// or to the end of the string.
///
/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring
#[wasm_bindgen(method, js_class = "String")]
pub fn substring(this: &JsString, index_start: u32, index_end: u32) -> JsString;
}
impl<'a> From<&'a str> for JsString {

109
tests/all/js_globals/JsString.rs Executable file → Normal file
View File

@ -59,3 +59,112 @@ fn slice() {
"#)
.test()
}
#[test]
fn starts_with() {
project()
.file("src/lib.rs", r#"
#![feature(proc_macro, wasm_custom_section)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
use wasm_bindgen::js;
#[wasm_bindgen]
pub fn string_starts_with(this: &js::JsString, search_string: &js::JsString, position: u32) -> bool {
this.starts_with(search_string, position)
}
"#)
.file("test.ts", r#"
import * as assert from "assert";
import * as wasm from "./out";
export function test() {
let str = "To be, or not to be, that is the question.";
// TODO: remove second parameter for both assertions once we have optional parameters
assert.ok(wasm.string_starts_with(str, 'To be', 0));
assert.ok(!wasm.string_starts_with(str, 'not to be', 0));
assert.ok(wasm.string_starts_with(str, 'not to be', 10));
}
"#)
.test()
}
#[test]
fn substring() {
project()
.file("src/lib.rs", r#"
#![feature(proc_macro, wasm_custom_section)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
use wasm_bindgen::js;
#[wasm_bindgen]
pub fn string_substring(this: &js::JsString, index_start: u32, index_end: u32) -> js::JsString {
this.substring(index_start, index_end)
}
"#)
.file("test.ts", r#"
import * as assert from "assert";
import * as wasm from "./out";
export function test() {
let anyString = "Mozilla";
assert.equal(wasm.string_substring(anyString, 0, 1), 'M');
assert.equal(wasm.string_substring(anyString, 1, 0), 'M');
assert.equal(wasm.string_substring(anyString, 0, 6), 'Mozill');
// TODO: Add test once we have optional parameters
// assert.equal(wasm.string_substring(anyString, 4), 'lla');
assert.equal(wasm.string_substring(anyString, 4, 7), 'lla');
assert.equal(wasm.string_substring(anyString, 7, 4), 'lla');
assert.equal(wasm.string_substring(anyString, 0, 7), 'Mozilla');
assert.equal(wasm.string_substring(anyString, 0, 10), 'Mozilla');
}
"#)
.test()
}
#[test]
fn index_of() {
project()
.file("src/lib.rs", r#"
#![feature(proc_macro, wasm_custom_section)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
use wasm_bindgen::js;
#[wasm_bindgen]
pub fn string_index_of(this: &js::JsString, search_value: &js::JsString, from_index: i32) -> i32 {
this.index_of(search_value, from_index)
}
"#)
.file("test.ts", r#"
import * as assert from "assert";
import * as wasm from "./out";
export function test() {
let str = "Blue Whale";
// TODO: remove second parameter once we have optional parameters
assert.equal(wasm.string_index_of(str, 'Blue', 0), 0);
// TODO: remove second parameter once we have optional parameters
assert.equal(wasm.string_index_of(str, 'Blute', 0), -1);
assert.equal(wasm.string_index_of(str, 'Whale', 0), 5);
assert.equal(wasm.string_index_of(str, 'Whale', 5), 5);
assert.equal(wasm.string_index_of(str, 'Whale', 7), -1);
// TODO: remove second parameter once we have optional parameters
assert.equal(wasm.string_index_of(str, '', 0), 0);
assert.equal(wasm.string_index_of(str, '', 9), 9);
assert.equal(wasm.string_index_of(str, '', 10), 10);
assert.equal(wasm.string_index_of(str, '', 11), 10);
}
"#)
.test()
}