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'use strict'

var whitespace = require('is-whitespace-character')

module.exports = table

var tab = '\t'
var lineFeed = '\n'
var space = ' '
var dash = '-'
var colon = ':'
var backslash = '\\'
var graveAccent = '`'
var verticalBar = '|'

var minColumns = 1
var minRows = 2

var left = 'left'
var center = 'center'
var right = 'right'

function table(eat, value, silent) {
  var self = this
  var index
  var alignments
  var alignment
  var subvalue
  var row
  var length
  var lines
  var queue
  var character
  var hasDash
  var align
  var cell
  var preamble
  var count
  var opening
  var now
  var position
  var lineCount
  var line
  var rows
  var table
  var lineIndex
  var pipeIndex
  var first

  // Exit when not in gfm-mode.
  if (!self.options.gfm) {
    return
  }

  // Get the rows.
  // Detecting tables soon is hard, so there are some checks for performance
  // here, such as the minimum number of rows, and allowed characters in the
  // alignment row.
  index = 0
  lineCount = 0
  length = value.length + 1
  lines = []

  while (index < length) {
    lineIndex = value.indexOf(lineFeed, index)
    pipeIndex = value.indexOf(verticalBar, index + 1)

    if (lineIndex === -1) {
      lineIndex = value.length
    }

    if (pipeIndex === -1 || pipeIndex > lineIndex) {
      if (lineCount < minRows) {
        return
      }

      break
    }

    lines.push(value.slice(index, lineIndex))
    lineCount++
    index = lineIndex + 1
  }

  // Parse the alignment row.
  subvalue = lines.join(lineFeed)
  alignments = lines.splice(1, 1)[0] || []
  index = 0
  length = alignments.length
  lineCount--
  alignment = false
  align = []

  while (index < length) {
    character = alignments.charAt(index)

    if (character === verticalBar) {
      hasDash = null

      if (alignment === false) {
        if (first === false) {
          return
        }
      } else {
        align.push(alignment)
        alignment = false
      }

      first = false
    } else if (character === dash) {
      hasDash = true
      alignment = alignment || null
    } else if (character === colon) {
      if (alignment === left) {
        alignment = center
      } else if (hasDash && alignment === null) {
        alignment = right
      } else {
        alignment = left
      }
    } else if (!whitespace(character)) {
      return
    }

    index++
  }

  if (alignment !== false) {
    align.push(alignment)
  }

  // Exit when without enough columns.
  if (align.length < minColumns) {
    return
  }

  /* istanbul ignore if - never used (yet) */
  if (silent) {
    return true
  }

  // Parse the rows.
  position = -1
  rows = []

  table = eat(subvalue).reset({type: 'table', align: align, children: rows})

  while (++position < lineCount) {
    line = lines[position]
    row = {type: 'tableRow', children: []}

    // Eat a newline character when this is not the first row.
    if (position) {
      eat(lineFeed)
    }

    // Eat the row.
    eat(line).reset(row, table)

    length = line.length + 1
    index = 0
    queue = ''
    cell = ''
    preamble = true
    count = null
    opening = null

    while (index < length) {
      character = line.charAt(index)

      if (character === tab || character === space) {
        if (cell) {
          queue += character
        } else {
          eat(character)
        }

        index++
        continue
      }

      if (character === '' || character === verticalBar) {
        if (preamble) {
          eat(character)
        } else {
          if (character && opening) {
            queue += character
            index++
            continue
          }

          if ((cell || character) && !preamble) {
            subvalue = cell

            if (queue.length > 1) {
              if (character) {
                subvalue += queue.slice(0, queue.length - 1)
                queue = queue.charAt(queue.length - 1)
              } else {
                subvalue += queue
                queue = ''
              }
            }

            now = eat.now()

            eat(subvalue)(
              {type: 'tableCell', children: self.tokenizeInline(cell, now)},
              row
            )
          }

          eat(queue + character)

          queue = ''
          cell = ''
        }
      } else {
        if (queue) {
          cell += queue
          queue = ''
        }

        cell += character

        if (character === backslash && index !== length - 2) {
          cell += line.charAt(index + 1)
          index++
        }

        if (character === graveAccent) {
          count = 1

          while (line.charAt(index + 1) === character) {
            cell += character
            index++
            count++
          }

          if (!opening) {
            opening = count
          } else if (count >= opening) {
            opening = 0
          }
        }
      }

      preamble = false
      index++
    }

    // Eat the alignment row.
    if (!position) {
      eat(lineFeed + alignments)
    }
  }

  return table
}