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Fix polyfill of TextEncoder and TextDecoder

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This commit does a few things, including:

* Fixing the generated JS of `wasm-bindgen` to allow polyfills to work.
  (a minor tweak of the generated JS)

* All examples are updated to include a Webpack-specific polyfill for
  these two types to get examples working in Edge.

* A new page has been added to the guide about supported browsers. This
  mentions known caveats like IE 11 requiring `wasm2js` as well as
  documenting some `TextEncoder` and `TextDecoder` workarounds for Edge.

Closes #895
This commit is contained in:
Alex Crichton
2018-09-28 20:01:46 -07:00
parent 0ac84c231a
commit 717cfa303d
52 changed files with 255 additions and 54 deletions
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58
crates/cli-support/src/js/mod.rs
View File

@ -972,7 +972,7 @@ impl<'a> Context<'a> {
"
function passStringToWasm(arg) {{
{}
const buf = cachedEncoder.encode(arg);
const buf = cachedTextEncoder.encode(arg);
const ptr = wasm.__wbindgen_malloc(buf.length);
getUint8Memory().set(buf, ptr);
return [ptr, buf.length];
@ -1065,58 +1065,32 @@ impl<'a> Context<'a> {
if !self.exposed_globals.insert("text_encoder") {
return;
}
if self.config.nodejs_experimental_modules {
self.imports
.push_str("import { TextEncoder } from 'util';\n");
} else if self.config.nodejs {
self.global(
"
const TextEncoder = require('util').TextEncoder;
",
);
} else if !(self.config.browser || self.config.no_modules) {
self.global(
"
const TextEncoder = typeof self === 'object' && self.TextEncoder
? self.TextEncoder
: require('util').TextEncoder;
",
);
}
self.global(
"
let cachedEncoder = new TextEncoder('utf-8');
",
);
self.expose_text_processor("TextEncoder");
}
fn expose_text_decoder(&mut self) {
if !self.exposed_globals.insert("text_decoder") {
return;
}
self.expose_text_processor("TextDecoder");
}
fn expose_text_processor(&mut self, s: &str) {
if self.config.nodejs_experimental_modules {
self.imports
.push_str("import { TextDecoder } from 'util';\n");
self.imports.push_str(&format!("import {{ {} }} from 'util';\n", s));
self.global(&format!("let cached{0} = new {0}('utf-8');", s));
} else if self.config.nodejs {
self.global(
"
const TextDecoder = require('util').TextDecoder;
",
);
self.global(&format!("const {0} = require('util').{0};", s));
self.global(&format!("let cached{0} = new {0}('utf-8');", s));
} else if !(self.config.browser || self.config.no_modules) {
self.global(
"
const TextDecoder = typeof self === 'object' && self.TextDecoder
? self.TextDecoder
: require('util').TextDecoder;
",
&format!("
const l{0} = typeof {0} === 'undefined' ? \
require('util').{0} : {0};\
", s)
);
self.global(&format!("let cached{0} = new l{0}('utf-8');", s));
}
self.global(
"
let cachedDecoder = new TextDecoder('utf-8');
",
);
}
fn expose_get_string_from_wasm(&mut self) {
@ -1148,7 +1122,7 @@ impl<'a> Context<'a> {
self.global(&format!(
"
function getStringFromWasm(ptr, len) {{
return cachedDecoder.decode(getUint8Memory().{}(ptr, ptr + len));
return cachedTextDecoder.decode(getUint8Memory().{}(ptr, ptr + len));
}}
",
method