Remove xeval subcommand (#3630)

1 files changed, 0 insertions, 170 deletions

diff --git a/std/xeval/mod.ts b/std/xeval/mod.ts
deleted file mode 100644
index 5843c8650..000000000
--- a/std/xeval/mod.ts
+++ /dev/null
@@ -1,170 +0,0 @@
-import { parse } from "../flags/mod.ts";
-const { Buffer, EOF, args, exit, stdin, writeAll } = Deno;
-type Reader = Deno.Reader;
-
-/* eslint-disable-next-line max-len */
-// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/AsyncFunction.
-const AsyncFunction = Object.getPrototypeOf(async function(): Promise<void> {})
-  .constructor;
-
-const HELP_MSG = `Deno xeval
-
-USAGE:
-  deno -A https://deno.land/std/xeval/mod.ts [OPTIONS] <code>
-
-OPTIONS:
-  -d, --delim <delim>       Set delimiter, defaults to newline
-  -I, --replvar <replvar>   Set variable name to be used in eval, defaults to $
-
-ARGS:
-  <code>`;
-
-export type XevalFunc = (v: string) => void;
-
-export interface XevalOptions {
-  delimiter?: string;
-}
-
-const DEFAULT_DELIMITER = "\n";
-
-// Generate longest proper prefix which is also suffix array.
-function createLPS(pat: Uint8Array): Uint8Array {
-  const lps = new Uint8Array(pat.length);
-  lps[0] = 0;
-  let prefixEnd = 0;
-  let i = 1;
-  while (i < lps.length) {
-    if (pat[i] == pat[prefixEnd]) {
-      prefixEnd++;
-      lps[i] = prefixEnd;
-      i++;
-    } else if (prefixEnd === 0) {
-      lps[i] = 0;
-      i++;
-    } else {
-      prefixEnd = pat[prefixEnd - 1];
-    }
-  }
-  return lps;
-}
-
-// TODO(kevinkassimo): Move this utility somewhere public in deno_std.
-// Import from there once doable.
-// Read from reader until EOF and emit string chunks separated
-// by the given delimiter.
-async function* chunks(
-  reader: Reader,
-  delim: string
-): AsyncIterableIterator<string> {
-  const encoder = new TextEncoder();
-  const decoder = new TextDecoder();
-  // Avoid unicode problems
-  const delimArr = encoder.encode(delim);
-  const delimLen = delimArr.length;
-  const delimLPS = createLPS(delimArr);
-
-  let inputBuffer = new Buffer();
-  const inspectArr = new Uint8Array(Math.max(1024, delimLen + 1));
-
-  // Modified KMP
-  let inspectIndex = 0;
-  let matchIndex = 0;
-  while (true) {
-    const result = await reader.read(inspectArr);
-    if (result === EOF) {
-      // Yield last chunk.
-      const lastChunk = inputBuffer.toString();
-      yield lastChunk;
-      return;
-    }
-    if ((result as number) < 0) {
-      // Discard all remaining and silently fail.
-      return;
-    }
-    const sliceRead = inspectArr.subarray(0, result as number);
-    await writeAll(inputBuffer, sliceRead);
-
-    let sliceToProcess = inputBuffer.bytes();
-    while (inspectIndex < sliceToProcess.length) {
-      if (sliceToProcess[inspectIndex] === delimArr[matchIndex]) {
-        inspectIndex++;
-        matchIndex++;
-        if (matchIndex === delimLen) {
-          // Full match
-          const matchEnd = inspectIndex - delimLen;
-          const readyBytes = sliceToProcess.subarray(0, matchEnd);
-          // Copy
-          const pendingBytes = sliceToProcess.slice(inspectIndex);
-          const readyChunk = decoder.decode(readyBytes);
-          yield readyChunk;
-          // Reset match, different from KMP.
-          sliceToProcess = pendingBytes;
-          inspectIndex = 0;
-          matchIndex = 0;
-        }
-      } else {
-        if (matchIndex === 0) {
-          inspectIndex++;
-        } else {
-          matchIndex = delimLPS[matchIndex - 1];
-        }
-      }
-    }
-    // Keep inspectIndex and matchIndex.
-    inputBuffer = new Buffer(sliceToProcess);
-  }
-}
-
-export async function xeval(
-  reader: Reader,
-  xevalFunc: XevalFunc,
-  { delimiter = DEFAULT_DELIMITER }: XevalOptions = {}
-): Promise<void> {
-  for await (const chunk of chunks(reader, delimiter)) {
-    // Ignore empty chunks.
-    if (chunk.length > 0) {
-      await xevalFunc(chunk);
-    }
-  }
-}
-
-async function main(): Promise<void> {
-  const parsedArgs = parse(args.slice(1), {
-    boolean: ["help"],
-    string: ["delim", "replvar"],
-    alias: {
-      delim: ["d"],
-      replvar: ["I"],
-      help: ["h"]
-    },
-    default: {
-      delim: DEFAULT_DELIMITER,
-      replvar: "$"
-    }
-  });
-  if (parsedArgs._.length != 1) {
-    console.error(HELP_MSG);
-    exit(1);
-  }
-  if (parsedArgs.help) {
-    return console.log(HELP_MSG);
-  }
-
-  const delimiter = parsedArgs.delim;
-  const replVar = parsedArgs.replvar;
-  const code = parsedArgs._[0];
-
-  // new AsyncFunction()'s error message for this particular case isn't great.
-  if (!replVar.match(/^[_$A-z][_$A-z0-9]*$/)) {
-    console.error(`Bad replvar identifier: "${replVar}"`);
-    exit(1);
-  }
-
-  const xEvalFunc = new AsyncFunction(replVar, code);
-
-  await xeval(stdin, xEvalFunc, { delimiter });
-}
-
-if (import.meta.main) {
-  main();
-}