Method getPositionFromOffset

src/utils/Cursor.ts:1429–1481

(offset: number)

  }

  public getPositionFromOffset(offset: number): Position {
    const lines = this.wrappedLines
    for (let line = 0; line < lines.length; line++) {
      const currentLine = lines[line]!
      const nextLine = lines[line + 1]
      if (
        offset >= currentLine.startOffset &&
        (!nextLine || offset < nextLine.startOffset)
      ) {
        // Calculate string position within the line
        const stringPosInLine = offset - currentLine.startOffset

        // Handle leading whitespace for wrapped lines
        let displayColumn: number
        if (currentLine.isPrecededByNewline) {
          // For lines preceded by newline, calculate display width directly
          displayColumn = this.stringIndexToDisplayWidth(
            currentLine.text,
            stringPosInLine,
          )
        } else {
          // For wrapped lines, we need to account for trimmed whitespace
          const leadingWhitespace =
            currentLine.text.length - currentLine.text.trimStart().length
          if (stringPosInLine < leadingWhitespace) {
            // Cursor is in the trimmed whitespace area, position at start
            displayColumn = 0
          } else {
            // Calculate display width from the trimmed text
            const trimmedText = currentLine.text.trimStart()
            const posInTrimmed = stringPosInLine - leadingWhitespace
            displayColumn = this.stringIndexToDisplayWidth(
              trimmedText,
              posInTrimmed,
            )
          }
        }

        return {
          line,
          column: Math.max(0, displayColumn),
        }
      }
    }

    // If we're past the last character, return the end of the last line
    const line = lines.length - 1
    const lastLine = this.wrappedLines[line]!
    return {
      line,
      column: stringWidth(lastLine.text),
    }
  }

  public get lineCount(): number {
    return this.wrappedLines.length