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import { Reader, ReadResult, open, copy } from 'deno';import { stringsReader } from 'https://deno.land/x/net/util.ts';import escape from './escape.ts';import { MultiReader } from 'https://syumai.github.io/deno-libs/io/multi.ts';
const globalEval = eval;const window = globalEval('this');
export interface Params {  [key: string]: any;}
enum ReadMode {  Normal,  Escaped,  Raw,  Comment,}
enum Codes {  Begin = 60, // <  End = 62, // >  Percent = 37, // %  Escaped = 61, // =  Raw = 45, // -  Comment = 35, // #}
async function renderInternal(body: Reader, params: Params): Promise<Reader> {  let src: Reader = body;  const buf = [];  const statement: Array<number> = [];  const readBuf = new Uint8Array(1);  const dec = new TextDecoder('utf-8');  let readMode: ReadMode = ReadMode.Normal;
  for (const [k, v] of Object.entries(params)) {    window[k] = v;  }
  return {    async read(p: Uint8Array): Promise<ReadResult> {      const len = p.byteLength;      let nread = 0;
      while (nread < len) {        const { eof } = await src.read(readBuf);        if (eof) {          break;        }
        buf.push(readBuf[0]);        if (buf.length < 3) {          continue;        }
        if (readMode === ReadMode.Normal) {          // Detect ReadMode          if (buf[0] === Codes.Begin && buf[1] === Codes.Percent) {            switch (buf[2]) {              case Codes.Escaped:                readMode = ReadMode.Escaped;                break;              case Codes.Raw:                readMode = ReadMode.Raw;                break;              case Codes.Comment:                readMode = ReadMode.Comment;                break;              default:                continue;            }            buf.splice(0);            continue;          }          if (buf.length > 2) {            p[nread] = buf.shift();            nread++;          }          continue;        }
        // Finish current ReadMode        if (buf[1] === Codes.Percent && buf[2] === Codes.End) {          statement.push(buf.shift());          buf.splice(0);          // Don't execute if ReadMode is Comment.          if (readMode !== ReadMode.Comment) {            const body = new Uint8Array(statement);            const str = dec.decode(body);            const s = globalEval(str).toString();            switch (readMode) {              case ReadMode.Raw:                src = new MultiReader(stringsReader(s), src);                break;              case ReadMode.Escaped:                src = new MultiReader(stringsReader(escape(s)), src);                break;            }          }          statement.splice(0);          readMode = ReadMode.Normal;          continue;        }        statement.push(buf.shift());      }
      // Flush buffer      while (nread < len && buf.length > 0) {        p[nread] = buf.shift();        nread++;      }      return { nread, eof: nread === 0 };    },  };}
export async function renderString(  str: string,  params: Params): Promise<Reader> {  const body = stringsReader(str);  return await renderInternal(body, params);}
export async function render(path: string, params: Params): Promise<Reader> {  const file = await open(path);  return await renderInternal(file, params);}