deno-musings/junk/module_inspector.ts

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2024-10-10 10:00:12 -04:00
type GlyphCheck = (inGlyph:string)=>boolean
const isAlphaLike:GlyphCheck =(inGlyph:string)=>
{
const inCode = inGlyph.charCodeAt(0);
if(inCode >= 97 && inCode <= 122)
{
return true;
}
if(inCode >= 65 && inCode <= 90)
{
return true;
}
return `$_.`.includes(inGlyph);
}
const isWhiteSpace:GlyphCheck =(inGlyph:string)=> `\n\r\t `.includes(inGlyph);
const isQuote:GlyphCheck =(inGlyph:string)=>`"'\``.includes(inGlyph)
const isNot =(inCheck:GlyphCheck)=> (inGlyph:string)=>!inCheck(inGlyph);
const contiguous =(inText:string, inStart:number, inTest:GlyphCheck):number=>
{
let ok = true;
let index = inStart;
let count = 0;
while(ok && count < inText.length)
{
count++;
ok = inTest(inText.charAt(index++));
}
return index-1;
}
const findNextExport =(inFile:string, inIndex=0, inLocal:Array<string>, inForeign:Array<string>)=>
{
const pos = inFile.indexOf("export", inIndex);
if(pos !== -1)
{
if(!isAlphaLike(inFile.charAt(pos-1)) || !isAlphaLike(inFile.charAt(pos+6)))
{
const nextCharInd = contiguous(inFile, pos+6, isWhiteSpace);
const nextChar = inFile[nextCharInd];
//console.log(inFile.substring(pos, nextCharInd+1), `>>${nextChar}<<`)
if(nextChar === "*")
{
const firstQuoteInd = contiguous(inFile, nextCharInd+1, isNot(isQuote) );
const secondQuoteInd = contiguous(inFile, firstQuoteInd+1, isNot(isQuote) );
//console.log("ASTERISK:", inFile.substring(pos, secondQuoteInd+1));
inForeign.push(inFile.substring(nextCharInd, secondQuoteInd+1));
}
else if(nextChar == "{")
{
const endBracketInd = contiguous(inFile, nextCharInd, (inGlyph:string)=>inGlyph!=="}");
const nextLetterInd = contiguous(inFile, endBracketInd+1, isWhiteSpace);
if(inFile.substring(nextLetterInd, nextLetterInd+4) == "from")
{
const firstQuoteInd = contiguous(inFile, nextLetterInd+4, isNot(isQuote) );
const secondQuoteInd = contiguous(inFile, firstQuoteInd+1, isNot(isQuote) );
//console.log(`BRACKET foreign: >>${inFile.substring(nextCharInd, secondQuoteInd+1)}<<`);
inForeign.push(inFile.substring(nextCharInd, secondQuoteInd+1));
}
else
{
const members = inFile.substring(nextCharInd+1, endBracketInd).replace(/\s/g, '');
members.split(",").forEach(part=>
{
const renamed = part.split(" as ");
inLocal.push(renamed[1] || renamed[0]);
});
}
}
else if(isAlphaLike(nextChar))
{
const keywordEndInd = contiguous(inFile, nextCharInd, isAlphaLike);
const keyword = inFile.substring(nextCharInd, keywordEndInd);
if(keyword === "default")
{
inLocal.push(keyword);
//console.log(`MEMBER: >>${keyword})}<<`);
}
else if(["const", "let", "var", "function", "class"].includes(keyword))
{
const varStartInd = contiguous(inFile, keywordEndInd+1, isWhiteSpace);
const varEndInd = contiguous(inFile, varStartInd+1, isAlphaLike);
//console.log(`MEMBER: >>${inFile.substring(varStartInd, varEndInd)}<<`);
inLocal.push(inFile.substring(varStartInd, varEndInd))
}
}
}
return pos + 7;
}
else
{
return false;
}
};
export const Exports =(inFile:string)=>
{
let match = 0 as number|false;
let count = 0;
const local = [] as string[];
const foreign = [] as string[];
while(match !== false && count <200)
{
count++;
match = findNextExport(inFile, match, local, foreign);
}
return[local, foreign] as [local:string[], foreign:string[]];
};
export const FileExports =async(inURL:string|URL)=>
{
const resp = await fetch(inURL);
const text = await resp.text();
return Exports(text);
}
//console.log(await FileExports(import.meta.resolve("./hmr-listen.tsx")));
/*
const [local, global] = Exports(`
// export in comment
export * from "react";
const fakeexport =()=>{};
export{ thing1 as remapped, thing2}
export{ thing1 as remapped, thing2} from 'React';
export
export const func=()=>{};
`);
console.log(local, global);
*/