var tokenize = require('glsl-tokenizer')
var atob     = require('atob-lite')

module.exports = getName

function getName(src) {
  var tokens = Array.isArray(src)
    ? src
    : tokenize(src)

  for (var i = 0; i < tokens.length; i++) {
    var token = tokens[i]
    if (token.type !== 'preprocessor') continue
    var match = token.data.match(/\#define\s+SHADER_NAME(_B64)?\s+(.+)$/)
    if (!match) continue
    if (!match[2]) continue

    var b64  = match[1]
    var name = match[2]

    return (b64 ? atob(name) : name).trim()
  }
}