toloframework/tpl/$.js

"use strict";

const ZERO_CHAR_CODE = '0'.charCodeAt( 0 );

exports.lang = function lang( _lang ) {
    let language = _lang;
    if ( typeof language === 'undefined' ) {
        if ( window.localStorage ) {
            language = window.localStorage.getItem( "Language" );
        }
        if ( !language ) {
            language = window.navigator.language;
            if ( !language ) {
                language = window.navigator.browserLanguage;
                if ( !language ) {
                    language = "fr";
                }
            }
        }
        language = language.substr( 0, 2 ).toLowerCase();
    }
    if ( window.localStorage ) {
        window.localStorage.setItem( "Language", language );
    }
    return language;
};

exports.intl = function intl( words, params ) {
    let dic = words[ exports.lang() ];

    const
        k = params[ 0 ],
        defLang = Object.keys( words )[ 0 ];
    if ( !defLang ) return k;

    if ( !dic ) {
        dic = words[ defLang ];
        if ( !dic ) {
            return k;
        }
    }
    let txt = dic[ k ];
    if ( !txt ) {
        dic = words[ defLang ];
        txt = dic[ k ];
    }
    if ( !txt ) return k;
    return processArguments( txt, params );
};


/**
 * @param {string} txt - Text with place holders like `$1`, `$2`, etc.
 * @param {array} params - Params for place holders replacement.
 * @return {string} The text with place holders replaces by params.
 */
function processArguments( txt, params ) {
    let output = txt;
    if ( params.length > 1 ) {
        let
            newTxt = "",
            lastIdx = 0;
        for ( let i = 0; i < txt.length; i++ ) {
            const c = txt.charAt( i );
            if ( c === '$' ) {
                newTxt += txt.substring( lastIdx, i );
                i++;
                const pos = txt.charCodeAt( i ) - ZERO_CHAR_CODE;
                if ( pos < 0 || pos >= params.length ) {
                    newTxt += `$${txt.charAt(i)}`;
                } else {
                    newTxt += params[ pos ];
                }
                lastIdx = i + 1;
            } else if ( c === '\\' ) {
                newTxt += txt.substring( lastIdx, i );
                i++;
                newTxt += txt.charAt( i );
                lastIdx = i + 1;
            }
        }
        newTxt += txt.substr( lastIdx );
        output = newTxt;
    }
    return output;
}