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Viewing file:     replace.js (1.5 KB)      -rw-r--r--

'use strict';

var jsTokens = require('js-tokens').default;

var processEnvRe = /\bprocess\.env\.[_$a-zA-Z][$\w]+\b/;
var spaceOrCommentRe = /^(?:\s|\/[/*])/;

function replace(src, envs) {
  if (!processEnvRe.test(src)) {
    return src;
  }

  var out = [];
  var purge = envs.some(function(env) {
    return env._ && env._.indexOf('purge') !== -1;
  });

  jsTokens.lastIndex = 0
  var parts = src.match(jsTokens);

  for (var i = 0; i < parts.length; i++) {
    if (parts[i    ] === 'process' &&
        parts[i + 1] === '.' &&
        parts[i + 2] === 'env' &&
        parts[i + 3] === '.') {
      var prevCodeToken = getAdjacentCodeToken(-1, parts, i);
      var nextCodeToken = getAdjacentCodeToken(1, parts, i + 4);
      var replacement = getReplacementString(envs, parts[i + 4], purge);
      if (prevCodeToken !== '.' &&
          nextCodeToken !== '.' &&
          nextCodeToken !== '=' &&
          typeof replacement === 'string') {
        out.push(replacement);
        i += 4;
        continue;
      }
    }
    out.push(parts[i]);
  }

  return out.join('');
}

function getAdjacentCodeToken(dir, parts, i) {
  while (true) {
    var part = parts[i += dir];
    if (!spaceOrCommentRe.test(part)) {
      return part;
    }
  }
}

function getReplacementString(envs, name, purge) {
  for (var j = 0; j < envs.length; j++) {
    var env = envs[j];
    if (typeof env[name] !== 'undefined') {
      return JSON.stringify(env[name]);
    }
  }
  if (purge) {
    return 'undefined';
  }
}

module.exports = replace;