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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use crate::compilers::CompiledModule;
use crate::file_fetcher::SourceFile;
use deno_core::ErrBox;
use regex::Regex;
// From https://github.com/mathiasbynens/mothereff.in/blob/master/js-variables/eff.js
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)$";
pub struct JsonCompiler {}
impl JsonCompiler {
pub async fn compile(
&self,
source_file: &SourceFile,
) -> Result<CompiledModule, ErrBox> {
let maybe_json_value = serde_json::from_slice(&source_file.source_code);
if let Err(err) = maybe_json_value {
return Err(ErrBox::from(err));
}
let mut code = format!(
"export default {};\n",
std::str::from_utf8(&source_file.source_code).unwrap()
);
if let serde_json::Value::Object(m) = maybe_json_value.unwrap() {
// Best effort variable name exports
// Actual all allowed JS variable names are way tricker.
// We only handle a subset of alphanumeric names.
let js_var_regex = Regex::new(r"^[a-zA-Z_$][0-9a-zA-Z_$]*$").unwrap();
// Also avoid collision with reserved words.
let reserved_words = Regex::new(JS_RESERVED_WORDS).unwrap();
for (key, value) in m.iter() {
if js_var_regex.is_match(&key) && !reserved_words.is_match(&key) {
code.push_str(&format!(
"export const {} = {};\n",
key,
value.to_string()
));
}
}
}
Ok(CompiledModule {
code,
name: source_file.url.to_string(),
})
}
}
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