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57 lines
2.1 KiB
Rust
57 lines
2.1 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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use crate::compilers::CompiledModule;
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use crate::compilers::CompiledModuleFuture;
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use crate::file_fetcher::SourceFile;
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use crate::futures::future::FutureExt;
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use deno::ErrBox;
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use regex::Regex;
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use std::pin::Pin;
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use std::str;
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// From https://github.com/mathiasbynens/mothereff.in/blob/master/js-variables/eff.js
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static JS_RESERVED_WORDS: &str = r"^(?:do|if|in|for|let|new|try|var|case|else|enum|eval|false|null|this|true|void|with|await|break|catch|class|const|super|throw|while|yield|delete|export|import|public|return|static|switch|typeof|default|extends|finally|package|private|continue|debugger|function|arguments|interface|protected|implements|instanceof)$";
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pub struct JsonCompiler {}
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impl JsonCompiler {
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pub fn compile_async(
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self: &Self,
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source_file: &SourceFile,
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) -> Pin<Box<CompiledModuleFuture>> {
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let maybe_json_value: serde_json::Result<serde_json::Value> =
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serde_json::from_str(&str::from_utf8(&source_file.source_code).unwrap());
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if let Err(err) = maybe_json_value {
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return futures::future::err(ErrBox::from(err)).boxed();
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}
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let mut code = format!(
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"export default {};\n",
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str::from_utf8(&source_file.source_code).unwrap()
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);
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if let serde_json::Value::Object(m) = maybe_json_value.unwrap() {
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// Best effort variable name exports
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// Actual all allowed JS variable names are way tricker.
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// We only handle a subset of alphanumeric names.
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let js_var_regex = Regex::new(r"^[a-zA-Z_$][0-9a-zA-Z_$]*$").unwrap();
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// Also avoid collision with reserved words.
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let reserved_words = Regex::new(JS_RESERVED_WORDS).unwrap();
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for (key, value) in m.iter() {
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if js_var_regex.is_match(&key) && !reserved_words.is_match(&key) {
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code.push_str(&format!(
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"export const {} = {};\n",
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key,
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value.to_string()
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));
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}
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}
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}
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let module = CompiledModule {
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code,
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name: source_file.url.to_string(),
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};
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futures::future::ok(module).boxed()
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}
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}
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