“use strict”;

Object.defineProperty(exports, “__esModule”, {

value: true

}); exports.merge = merge; exports.validate = validate; exports.normalizeReplacements = normalizeReplacements;

function _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys; if (excluded.indexOf(key) >= 0) continue; target = source; } return target; }

function merge(a, b) {

const {
  placeholderWhitelist = a.placeholderWhitelist,
  placeholderPattern = a.placeholderPattern,
  preserveComments = a.preserveComments,
  syntacticPlaceholders = a.syntacticPlaceholders
} = b;
return {
  parser: Object.assign({}, a.parser, {}, b.parser),
  placeholderWhitelist,
  placeholderPattern,
  preserveComments,
  syntacticPlaceholders
};

}

function validate(opts) {

if (opts != null && typeof opts !== "object") {
  throw new Error("Unknown template options.");
}

const _ref = opts || {},
      {
  placeholderWhitelist,
  placeholderPattern,
  preserveComments,
  syntacticPlaceholders
} = _ref,
      parser = _objectWithoutPropertiesLoose(_ref, ["placeholderWhitelist", "placeholderPattern", "preserveComments", "syntacticPlaceholders"]);

if (placeholderWhitelist != null && !(placeholderWhitelist instanceof Set)) {
  throw new Error("'.placeholderWhitelist' must be a Set, null, or undefined");
}

if (placeholderPattern != null && !(placeholderPattern instanceof RegExp) && placeholderPattern !== false) {
  throw new Error("'.placeholderPattern' must be a RegExp, false, null, or undefined");
}

if (preserveComments != null && typeof preserveComments !== "boolean") {
  throw new Error("'.preserveComments' must be a boolean, null, or undefined");
}

if (syntacticPlaceholders != null && typeof syntacticPlaceholders !== "boolean") {
  throw new Error("'.syntacticPlaceholders' must be a boolean, null, or undefined");
}

if (syntacticPlaceholders === true && (placeholderWhitelist != null || placeholderPattern != null)) {
  throw new Error("'.placeholderWhitelist' and '.placeholderPattern' aren't compatible" + " with '.syntacticPlaceholders: true'");
}

return {
  parser,
  placeholderWhitelist: placeholderWhitelist || undefined,
  placeholderPattern: placeholderPattern == null ? undefined : placeholderPattern,
  preserveComments: preserveComments == null ? false : preserveComments,
  syntacticPlaceholders: syntacticPlaceholders == null ? undefined : syntacticPlaceholders
};

}

function normalizeReplacements(replacements) {

if (Array.isArray(replacements)) {
  return replacements.reduce((acc, replacement, i) => {
    acc["$" + i] = replacement;
    return acc;
  }, {});
} else if (typeof replacements === "object" || replacements == null) {
  return replacements || undefined;
}

throw new Error("Template replacements must be an array, object, null, or undefined");

}