Method getOffsetFromPosition

src/utils/Cursor.ts:1386–1422

(position: Position)

  }

  public getOffsetFromPosition(position: Position): number {
    const wrappedLine = this.getLine(position.line)

    // Handle blank lines specially
    if (wrappedLine.text.length === 0 && wrappedLine.endsWithNewline) {
      return wrappedLine.startOffset
    }

    // Account for leading whitespace
    const leadingWhitespace = wrappedLine.isPrecededByNewline
      ? 0
      : wrappedLine.text.length - wrappedLine.text.trimStart().length

    // Convert display column to string index
    const displayColumnWithLeading = position.column + leadingWhitespace
    const stringIndex = this.displayWidthToStringIndex(
      wrappedLine.text,
      displayColumnWithLeading,
    )

    // Calculate the actual offset
    const offset = wrappedLine.startOffset + stringIndex

    // For normal lines
    const lineEnd = wrappedLine.startOffset + wrappedLine.text.length

    // Don't allow going past the end of the current line into the next line
    // unless we're at the very end of the text
    let maxOffset = lineEnd
    const lineDisplayWidth = stringWidth(wrappedLine.text)
    if (wrappedLine.endsWithNewline && position.column > lineDisplayWidth) {
      // Allow positioning after the newline
      maxOffset = lineEnd + 1
    }

    return Math.min(offset, maxOffset)
  }

  public getLineLength(line: number): number {
    const wrappedLine = this.getLine(line)