entodicton/lines.js

class Lines {
  constructor (widths) {
    this.widths = widths
    this.lines = []
    this.rows = []
  }

  addLine () {
    this.lines.push(this.widths.map((width) => ''.padEnd(width)))
  }

  // will wrap to next line within the column
  setElement (row, column, value, fullWidth = false) {
    const values = value.toString().split('\n')
    if (column >= this.widths.length) {
      throw new Error('Column out of range.')
    }
    const width = fullWidth ? value.length : this.widths[column]
    let index = 0
    for (value of values) {
      while (value.length > 0) {
        const lineValue = value.substring(0, width).padEnd(width)
        const remaining = value.substring(width)
        const line = this.getLine(row + index)
        line[column] = lineValue
        value = remaining
        ++index
      }
    }
  }

  toString () {
    this.newRow()
    let result = ''
    for (const row of this.rows) {
      result += row
      result += '\n'
    }
    return result
  }

  newRow () {
    for (const line of this.lines) {
      this.rows.push(line.join(''))
    }
    this.lines = []
  }

  log () {
    for (const line of this.lines) {
      console.log(line.join(''))
    }
    this.lines = []
  }

  getLine (indexFromZero) {
    while (this.lines.length < indexFromZero + 1) {
      this.addLine()
    }
    return this.lines[indexFromZero]
  }
}

module.exports = Lines