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Brython-AOT.ts
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Brython-AOT.ts
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import { parse } from "https://deno.land/[email protected]/flags/mod.ts";
import { walk } from "https://deno.land/[email protected]/fs/walk.ts";
import {exists} from "https://deno.land/std/fs/mod.ts"
import { dirname, basename } from "https://deno.land/std/path/mod.ts";
const flags = parse(Deno.args, {
boolean: ["usage", "watch"],
string: ["src", "dst"],
default: { help: false, watch: false },
});
if(flags.usage) {
console.log('deno run --allow-read --allow-write Brython-AOT.ts [--watch] --src $SRC_DIR --dst $DST_DIR');
Deno.exit(0);
}
function filter(path) {
return path.endsWith('.py') || path.endsWith('.bry');
}
function getDstPath(path) {
return DST_DIR + '/' + path.slice( SRC_DIR.length ) + '.js';
}
/* ACTIONS */
async function convertFile(src, dst) {
console.log('Converting', src, 'to', dst);
const dstdir = await dirname(dst);
if( ! await exists(dstdir) )
await Deno.mkdir(dstdir, { recursive: true });
const pycode = await Deno.readTextFile(src);
let js_ast = __BRYTHON__.py2js(pycode, "exec");
//TODO: output modes
const js_code =
`// Javascript code generated from Brython AOT
// https://github.com/denis-migdal/Brython-AOT
(async function(){
__BRYTHON__.imported["exec"] = {};
__BRYTHON__.frames_stack = [];
${js_ast.to_js()}
})();
`
await Deno.writeTextFile(dst, js_code);
}
async function isDirEmpty(path) {
for await (const dirEntry of Deno.readDir(path) )
return false;
return true;
}
async function removeFile(path) {
console.log('Removing file', path);
await Deno.remove(path);
let pathDir = await dirname(path);
while( await isDirEmpty(pathDir) ) {
console.log('Removing dir', pathDir);
await Deno.remove(pathDir);
pathDir = await dirname(pathDir);
}
}
/* Program */
const {src: SRC_DIR, dst: DST_DIR, watch} = flags;
console.log('** loading Brython parser **');
const PARSER_SCRIPT = await Deno.readTextFile( Deno.cwd() + '/brython.js' );
window.__BRYTHON__ = {};
/*
window.location = {
href: "http://localhost/",
origin: "http://localhost",
pathname: "/"
};
window.document = {
getElementsByTagName: () => [{src: "http://localhost/"}],
currentScript: () => {src: "http://localhost/"}
};
window.MutationObserver = function() { this.observe = () => {}; }
*/
eval(PARSER_SCRIPT);
console.log('** converting existing files **');
for await (const walkEntry of walk(SRC_DIR) ) {
const path = walkEntry.path;
if( ! walkEntry.isFile || ! filter(path) )
continue;
await convertFile( path, getDstPath(path) );
}
if( watch ) {
console.log("** now listening for changes **");
const watcher = Deno.watchFs(SRC_DIR, {recursive: true});
for await (const event of watcher) {
const paths = event.paths.filter( path => filter(path) );
if(paths.length === 0)
continue;
if( event.kind === "modify" ) {
if( event.paths.length === 2 ) { // this is move file...
const [srcfile, dstfile] = event.paths;
if( filter(srcfile) )
await removeFile( getDstPath(srcfile) );
if( dstfile.startsWith(SRC_DIR) && filter( dstfile ) )
await convertFile(dstfile, getDstPath(dstfile) );
continue;
}
for(let path of paths)
await convertFile(path, getDstPath(path) )
}
if( event.kind === "remove" )
for(let path of paths)
await removeFile( getDstPath(path) );
}
}