Method deleteTokenBefore

source code/utils/Cursor.ts:939–971

* Deletes a token before the cursor if one exists. * Supports pasted text refs: [Pasted text #1], [Pasted text #1 +10 lines], * [...Truncated text #1 +10 lines...] * * Note: @mentions are NOT tokenized since users may want to correct typos * in file paths. Use Ctrl/Cmd+backspace for w

()

   * Only triggers when cursor is at end of token (followed by whitespace or EOL).
   */
  deleteTokenBefore(): Cursor | null {
    // Cursor at chip.start is the "selected" state — backspace deletes the
    // chip forward, not the char before it.
    const chipAfter = this.imageRefStartingAt(this.offset)
    if (chipAfter) {
      const end =
        this.text[chipAfter.end] === ' ' ? chipAfter.end + 1 : chipAfter.end
      return this.modifyText(new Cursor(this.measuredText, end))
    }

    if (this.isAtStart()) {
      return null
    }

    // Only trigger if cursor is at a word boundary (whitespace or end of string after cursor)
    const charAfter = this.text[this.offset]
    if (charAfter !== undefined && !/\s/.test(charAfter)) {
      return null
    }

    const textBefore = this.text.slice(0, this.offset)

    // Check for pasted/truncated text refs: [Pasted text #1] or [...Truncated text #1 +50 lines...]
    const pasteMatch = textBefore.match(
      /(^|\s)\[(Pasted text #\d+(?: \+\d+ lines)?|Image #\d+|\.\.\.Truncated text #\d+ \+\d+ lines\.\.\.)\]$/,
    )
    if (pasteMatch) {
      const matchStart = pasteMatch.index! + pasteMatch[1]!.length
      return new Cursor(this.measuredText, matchStart).modifyText(this)
    }

    return null
  }

  deleteWordAfter(): Cursor {
    if (this.isAtEnd()) {