'use strict';

var require$$0 = require('util');
require('../triple-beam/index.js');
var index = require('../../_virtual/index12.js');

var splat;
var hasRequiredSplat;

function requireSplat () {
	if (hasRequiredSplat) return splat;
	hasRequiredSplat = 1;

	const util = require$$0;
	const { SPLAT } = index.__exports;

	/**
	 * Captures the number of format (i.e. %s strings) in a given string.
	 * Based on `util.format`, see Node.js source:
	 * https://github.com/nodejs/node/blob/b1c8f15c5f169e021f7c46eb7b219de95fe97603/lib/util.js#L201-L230
	 * @type {RegExp}
	 */
	const formatRegExp = /%[scdjifoO%]/g;

	/**
	 * Captures the number of escaped % signs in a format string (i.e. %s strings).
	 * @type {RegExp}
	 */
	const escapedPercent = /%%/g;

	class Splatter {
	  constructor(opts) {
	    this.options = opts;
	  }

	  /**
	     * Check to see if tokens <= splat.length, assign { splat, meta } into the
	     * `info` accordingly, and write to this instance.
	     *
	     * @param  {Info} info Logform info message.
	     * @param  {String[]} tokens Set of string interpolation tokens.
	     * @returns {Info} Modified info message
	     * @private
	     */
	  _splat(info, tokens) {
	    const msg = info.message;
	    const splat = info[SPLAT] || info.splat || [];
	    const percents = msg.match(escapedPercent);
	    const escapes = percents && percents.length || 0;

	    // The expected splat is the number of tokens minus the number of escapes
	    // e.g.
	    // - { expectedSplat: 3 } '%d %s %j'
	    // - { expectedSplat: 5 } '[%s] %d%% %d%% %s %j'
	    //
	    // Any "meta" will be arugments in addition to the expected splat size
	    // regardless of type. e.g.
	    //
	    // logger.log('info', '%d%% %s %j', 100, 'wow', { such: 'js' }, { thisIsMeta: true });
	    // would result in splat of four (4), but only three (3) are expected. Therefore:
	    //
	    // extraSplat = 3 - 4 = -1
	    // metas = [100, 'wow', { such: 'js' }, { thisIsMeta: true }].splice(-1, -1 * -1);
	    // splat = [100, 'wow', { such: 'js' }]
	    const expectedSplat = tokens.length - escapes;
	    const extraSplat = expectedSplat - splat.length;
	    const metas = extraSplat < 0
	      ? splat.splice(extraSplat, -1 * extraSplat)
	      : [];

	    // Now that { splat } has been separated from any potential { meta }. we
	    // can assign this to the `info` object and write it to our format stream.
	    // If the additional metas are **NOT** objects or **LACK** enumerable properties
	    // you are going to have a bad time.
	    const metalen = metas.length;
	    if (metalen) {
	      for (let i = 0; i < metalen; i++) {
	        Object.assign(info, metas[i]);
	      }
	    }

	    info.message = util.format(msg, ...splat);
	    return info;
	  }

	  /**
	    * Transforms the `info` message by using `util.format` to complete
	    * any `info.message` provided it has string interpolation tokens.
	    * If no tokens exist then `info` is immutable.
	    *
	    * @param  {Info} info Logform info message.
	    * @param  {Object} opts Options for this instance.
	    * @returns {Info} Modified info message
	    */
	  transform(info) {
	    const msg = info.message;
	    const splat = info[SPLAT] || info.splat;

	    // No need to process anything if splat is undefined
	    if (!splat || !splat.length) {
	      return info;
	    }

	    // Extract tokens, if none available default to empty array to
	    // ensure consistancy in expected results
	    const tokens = msg && msg.match && msg.match(formatRegExp);

	    // This condition will take care of inputs with info[SPLAT]
	    // but no tokens present
	    if (!tokens && (splat || splat.length)) {
	      const metas = splat.length > 1
	        ? splat.splice(0)
	        : splat;

	      // Now that { splat } has been separated from any potential { meta }. we
	      // can assign this to the `info` object and write it to our format stream.
	      // If the additional metas are **NOT** objects or **LACK** enumerable properties
	      // you are going to have a bad time.
	      const metalen = metas.length;
	      if (metalen) {
	        for (let i = 0; i < metalen; i++) {
	          Object.assign(info, metas[i]);
	        }
	      }

	      return info;
	    }

	    if (tokens) {
	      return this._splat(info, tokens);
	    }

	    return info;
	  }
	}

	/*
	 * function splat (info)
	 * Returns a new instance of the splat format TransformStream
	 * which performs string interpolation from `info` objects. This was
	 * previously exposed implicitly in `winston < 3.0.0`.
	 */
	splat = opts => new Splatter(opts);
	return splat;
}

exports.__require = requireSplat;
