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Viewing file:     index.js (2.6 KB)      -rw-r--r--

module.exports = function parseBMFontAscii(data) {
  if (!data)
    throw new Error('no data provided')
  data = data.toString().trim()

  var output = {
    pages: [],
    chars: [],
    kernings: []
  }

  var lines = data.split(/\r\n?|\n/g)

  if (lines.length === 0)
    throw new Error('no data in BMFont file')

  for (var i = 0; i < lines.length; i++) {
    var lineData = splitLine(lines[i], i)
    if (!lineData) //skip empty lines
      continue

    if (lineData.key === 'page') {
      if (typeof lineData.data.id !== 'number')
        throw new Error('malformed file at line ' + i + ' -- needs page id=N')
      if (typeof lineData.data.file !== 'string')
        throw new Error('malformed file at line ' + i + ' -- needs page file="path"')
      output.pages[lineData.data.id] = lineData.data.file
    } else if (lineData.key === 'chars' || lineData.key === 'kernings') {
      //... do nothing for these two ...
    } else if (lineData.key === 'char') {
      output.chars.push(lineData.data)
    } else if (lineData.key === 'kerning') {
      output.kernings.push(lineData.data)
    } else {
      output[lineData.key] = lineData.data
    }
  }

  return output
}

function splitLine(line, idx) {
  line = line.replace(/\t+/g, ' ').trim()
  if (!line)
    return null

  var space = line.indexOf(' ')
  if (space === -1) 
    throw new Error("no named row at line " + idx)

  var key = line.substring(0, space)

  line = line.substring(space + 1)
  //clear "letter" field as it is non-standard and
  //requires additional complexity to parse " / = symbols
  line = line.replace(/letter=[\'\"]\S+[\'\"]/gi, '')  
  line = line.split("=")
  line = line.map(function(str) {
    return str.trim().match((/(".*?"|[^"\s]+)+(?=\s*|\s*$)/g))
  })

  var data = []
  for (var i = 0; i < line.length; i++) {
    var dt = line[i]
    if (i === 0) {
      data.push({
        key: dt[0],
        data: ""
      })
    } else if (i === line.length - 1) {
      data[data.length - 1].data = parseData(dt[0])
    } else {
      data[data.length - 1].data = parseData(dt[0])
      data.push({
        key: dt[1],
        data: ""
      })
    }
  }

  var out = {
    key: key,
    data: {}
  }

  data.forEach(function(v) {
    out.data[v.key] = v.data;
  })

  return out
}

function parseData(data) {
  if (!data || data.length === 0)
    return ""

  if (data.indexOf('"') === 0 || data.indexOf("'") === 0)
    return data.substring(1, data.length - 1)
  if (data.indexOf(',') !== -1)
    return parseIntList(data)
  return parseInt(data, 10)
}

function parseIntList(data) {
  return data.split(',').map(function(val) {
    return parseInt(val, 10)
  })
}