source: imaps-frontend/node_modules/relateurl/lib/relate/relativize.js

"use strict";

var pathUtils = require("../util/path");



/*
        Get a path relative to the site path.
*/
function relatePath(absolutePath, siteAbsolutePath)
{
        var relativePath = [];
        
        // At this point, it's related to the host/port
        var related = true;
        var parentIndex = -1;
        
        // Find parents
        siteAbsolutePath.forEach( function(siteAbsoluteDir, i)
        {
                if (related)
                {
                        if (absolutePath[i] !== siteAbsoluteDir)
                        {
                                related = false;
                        }
                        else
                        {
                                parentIndex = i;
                        }
                }
                
                if (!related)
                {
                        // Up one level
                        relativePath.push("..");
                }
        });
        
        // Form path
        absolutePath.forEach( function(dir, i)
        {
                if (i > parentIndex)
                {
                        relativePath.push(dir);
                }
        });
        
        return relativePath;
}



function relativize(urlObj, siteUrlObj, options)
{
        if (urlObj.extra.relation.minimumScheme)
        {
                var pathArray = relatePath(urlObj.path.absolute.array, siteUrlObj.path.absolute.array);
                
                urlObj.path.relative.array  = pathArray;
                urlObj.path.relative.string = pathUtils.join(pathArray);
        }
}



module.exports = relativize;