Function advance

MathBox/mathbox-bundle.js:79408–79457

(id)

}

function advance(id) {
  var next
    , value
    , type
    , output

  if(id && token.data !== id) {
    return state.unexpected('expected `'+ id + '`, got `'+token.data+'`')
  }

  if(idx >= tokens.length) {
    token = symbol_table['(end)']
    return
  }

  next = tokens[idx++]
  value = next.data
  type = next.type

  if(type === 'ident') {
    output = state.scope.find(value) || state.create_node()
    type = output.type
  } else if(type === 'builtin') {
    output = symbol_table['(builtin)']
  } else if(type === 'keyword') {
    output = symbol_table['(keyword)']
  } else if(type === 'operator') {
    output = symbol_table[value]
    if(!output) {
      return state.unexpected('unknown operator `'+value+'`')
    }
  } else if(type === 'float' || type === 'integer') {
    type = 'literal'
    output = symbol_table['(literal)']
  } else {
    return state.unexpected('unexpected token.')
  }

  if(output) {
    if(!output.nud) { output.nud = itself }
    if(!output.children) { output.children = [] }
  }

  output = Object.create(output)
  output.token = next
  output.type = type
  if(!output.data) output.data = value

  return token = output
}

function fail(message) {
  return function() { return state.unexpected(message) }