/*global charDecoder*/
/*
This code may be used internally to Travelocity without limitation,
exclusion, or restriction.  If this code is used externally the
following comment must be included everywhere this code is used.
*/

/***********************************************************************
This is written by Austin Cheney on 21 Apr 2010.  Anybody may use this
code without permission so long as this comment exists verbatim in each
instance of its use.

http://www.travelocity.com/
http://mailmarkup.org/
***********************************************************************/

/*
This code beautifies character separated values into new lines at each
split in the output.  Prior existing new lines are converted into braces
containing a space if the prior existing new line was quoted.  Unquoted
new lines are converted to two sequential new lines.  In CSV format
double quote characters are syntax characters.  To exist as string
literals they must be contained in a string that is wrapped in double
quote characters and must be escaped by immediately following double
quote character with another double quote character.  This function
replaces the two simultaneous double quote characters with a single
double quote character for ledgibility.  The charDecoder function is
used on the separating character sequence to convert any sequence of
decimal and hexidecimal Unicode character entities into character
literals.
*/

var csvbeauty = function (source, ch) {
    "use strict";
    if (ch.length > source.length) {
        return source;
    }
    if (ch === "") {
        ch = ",";
    } else {
        ch = charDecoder(ch);
    }
    var err,
    a,
    c = [],
    error = "Error: Unterminated String begging at character number ",
    str = (function () {
        var b, src;
        source = source.replace(/"{2}/g, "{csvquote}");
        src = source;
        source = source.split("");
        for (a = 0; a < source.length; a += 1) {
            if (source[a] === "\"") {
                for (b = a + 1; b < source.length; b += 1) {
                    if (source[b] === "\"") {
                        c.push(src.slice(a, b + 1));
                        source[a] = "{csvstring}";
                        source[b] = "";
                        a = b + 1;
                        break;
                    }
                    source[b] = "";
                }
                if (b === source.length) {
                    err = source.join("").slice(a, a + 9);
                    source = error;
                    return;
                }
            }
        }
        source = source.join("").replace(/\{csvquote\}/g, "\"\"");
    }());
    if (source === error) {
        if (a !== source.length - 1) {
            return source + a + ", '" + err + "'.";
        } else {
            return source + a + ".";
        }
    }
    source = source.replace(/\n/g, "\n\n{-}\n\n");
    if (source.charAt(source.length - ch.length) === ch) {
        source = source.slice(0, source.length + 1 - ch.length) + "{|}";
    }
    do {
        source = source.replace(ch, "\n");
    } while (source.indexOf(ch) !== -1);
    for (a = 0; a < c.length; a += 1) {
        c[a] = c[a].replace(/\n/g, "{ }");
        source = source.replace("{csvstring}", c[a]);
    }
    source = source.replace(/\{csvquote\}/g, "\"");
    return source;
};