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First pass at implementing functions for browsers

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This commit is contained in:
Alex Crichton 2017-12-18 15:14:13 -08:00
parent ea36df2e01
commit d768b42a64
1 changed files with 23 additions and 2 deletions
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25
crates/wasm-bindgen-cli-support/src/js.rs
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@ -229,7 +229,18 @@ impl Js {
}
");
} else {
panic!("browser strings not implemented yet");
globals.push_str("
function passStringToWasm(arg) {
if (typeof(n) !== 'string')
throw new Error('expected a string argument');
const buf = new TextEncoder('utf-8').encode(arg);
const len = buf.length;
const ptr = exports.__wbindgen_malloc(len);
let array = new Uint8Array(memory.buffer);
array.set(buf, ptr);
return [ptr, len];
}
");
}
}
if self.expose_get_string_from_wasm {
@ -246,7 +257,17 @@ impl Js {
}
");
} else {
panic!("strings not implemented for browser");
globals.push_str("
function getStringFromWasm(ptr) {
const mem = new Uint8Array(memory.buffer);
const data = exports.__wbindgen_boxed_str_ptr(ptr);
const len = exports.__wbindgen_boxed_str_len(ptr);
const slice = mem.slice(data, data + len);
const ret = new TextDecoder('utf-8').decode(slice);
exports.__wbindgen_boxed_str_free(ptr);
return ret;
}
");
}
}