Method up

source code/utils/Cursor.ts:355–377

()

  }

  up(): Cursor {
    const { line, column } = this.getPosition()
    if (line === 0) {
      return this
    }

    const prevLine = this.measuredText.getWrappedText()[line - 1]
    if (prevLine === undefined) {
      return this
    }

    const prevLineDisplayWidth = stringWidth(prevLine)
    if (column > prevLineDisplayWidth) {
      const newOffset = this.getOffset({
        line: line - 1,
        column: prevLineDisplayWidth,
      })
      return new Cursor(this.measuredText, newOffset, 0)
    }

    const newOffset = this.getOffset({ line: line - 1, column })
    return new Cursor(this.measuredText, newOffset, 0)
  }

  down(): Cursor {
    const { line, column } = this.getPosition()