Factor

1 files changed, 0 insertions, 103 deletions

diff --git a/src/toys/turing/js/tape.js b/src/toys/turing/js/tape.js
deleted file mode 100644
index fd05366..0000000
--- a/src/toys/turing/js/tape.js
+++ /dev/null
@@ -1,103 +0,0 @@
-const ESCAPE_REGEX = /[.*+?^${}()|[\]\\]/g;
-
-function escapeForRegex(value) {
-  return value.replace(ESCAPE_REGEX, "\\$&");
-}
-
-export class Tape {
-  constructor({
-    initialContent = "",
-    blankSymbol = "B",
-    minLength = 50,
-    padding = 40
-  } = {}) {
-    this.blankSymbol = blankSymbol;
-    this.minLength = minLength;
-    this.padding = padding;
-    this.reset(initialContent);
-  }
-
-  reset(initialContent = "") {
-    const targetLength = Math.max(this.minLength, initialContent.length + this.padding);
-    this.cells = Array(targetLength).fill(this.blankSymbol);
-    const startOffset = Math.floor((targetLength - initialContent.length) / 2);
-    for (let i = 0; i < initialContent.length; i++) {
-      this.cells[startOffset + i] = initialContent[i];
-    }
-    this.headIndex = startOffset;
-  }
-
-  get length() {
-    return this.cells.length;
-  }
-
-  getHeadIndex() {
-    return this.headIndex;
-  }
-
-  readHead() {
-    return this.getCell(this.headIndex);
-  }
-
-  writeHead(symbol) {
-    this.cells[this.headIndex] = symbol || this.blankSymbol;
-  }
-
-  readAt(index) {
-    return this.getCell(index);
-  }
-
-  writeAt(index, symbol) {
-    if (index < 0) {
-      throw new Error("Cannot write to a negative tape index");
-    }
-    this.ensureRightCapacity(index);
-    this.cells[index] = symbol || this.blankSymbol;
-  }
-
-  setHead(index) {
-    if (index < 0) {
-      throw new Error("Head index cannot be negative");
-    }
-    this.ensureRightCapacity(index);
-    this.headIndex = index;
-  }
-
-  moveLeft() {
-    if (this.headIndex === 0) {
-      this.cells.unshift(this.blankSymbol);
-    } else {
-      this.headIndex -= 1;
-      return;
-    }
-  }
-
-  moveRight() {
-    this.headIndex += 1;
-    if (this.headIndex >= this.cells.length) {
-      this.cells.push(this.blankSymbol);
-    }
-  }
-
-  getCell(index) {
-    if (index < 0 || index >= this.cells.length) {
-      return this.blankSymbol;
-    }
-    return this.cells[index];
-  }
-
-  ensureRightCapacity(index) {
-    while (index >= this.cells.length) {
-      this.cells.push(this.blankSymbol);
-    }
-  }
-
-  getContents({ trimTrailing = true } = {}) {
-    let snapshot = this.cells.join("");
-    if (trimTrailing) {
-      const regex = new RegExp(`${escapeForRegex(this.blankSymbol)}+$`, "g");
-      snapshot = snapshot.replace(regex, "");
-    }
-    return snapshot;
-  }
-}