5a739853
 patrick.he
commit
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//this is basic class for loading page/layout data from json or csv files
module.exports = function(params) {
require('require-csv')//lightweight class for parsing possible csv data
var fs = require("fs"),
engine = params["engine"]
var $type = params["type"] || "page" //page or layout?
var $name = params["name"] //page or layout name
var $main_template = null
var $partials = {} //will hold all compiled partials that will be passed onto the base Mustache template for further processing
var $vars = {} //holds the variables and data that will be accessed in mustache via page.variableName or layout.variableName
var $data_dir = ''
var $views_dir = ''
this.initiate = function(callback) {//reading and initiate page data from json file
$data_dir = params.path['data'];
var filename = $data_dir +"/"+$type+"s/"+ $name + '.json';
var data = fs.readFileSync(filename, 'utf-8')
$vars = JSON.parse(data);
if('alias' in $vars) {
$name = $vars['alias'];
filename = $data_dir +"/"+$type+"s/"+ $name + '.json';
data = fs.readFileSync(filename, 'utf-8')
$vars = extend(JSON.parse(data), $vars)
}
if($type != "layout" && !("layout" in $vars)) $vars["layout"] = "default";
map_script_names();
//now load all data relating to this page
load_data($data_dir)
var wait_for_compression = false;
//load inline scripts and styles
$views_dir = params.path['views'];
if($type == 'page') {
if(fs.existsSync($views_dir + '/assets/scripts/' + $name + '.js')) {
if(params.compressor) {
wait_for_compression = true;
params.compressor.compress($views_dir + '/assets/scripts/' + $name + '.js', {
charset: 'utf8',
type: 'js'
}, function(err, data, extra) {
if(err) console.log(err);
$vars['inline_scripts'] = data;
callback.call();
});
}
else $vars['inline_scripts'] = fs.readFileSync($views_dir + '/assets/scripts/' + $name + '.js' , 'utf-8');
}
if(fs.existsSync($views_dir + '/assets/styles/' + $name + '.css')) {
$vars['inline_styles'] = fs.readFileSync($views_dir + '/assets/styles/' + $name + '.css' , 'utf-8')
}
}
if( !wait_for_compression && typeof callback === "function" ) callback.call();
}
/**
This functions loads the data related to each page or layout
for a page we load all files in the related directory
for a layout we check the "datas-sources" attribute of our layout_file.json and load them
In your real world application you can load data only when it is needed according to each page inside controllers
*/
var load_data = function(data_dir) {
var data_files = {}
var format = new RegExp("([0-9a-z\\-_]+)\\.(json|csv)$" , "i");
//see if there's a folder for partial data relating to this page or layout
//if so iterate all json/csv files and load the data
var partial_data_folder = data_dir + "/"+$type +"s/partials/" + $name;
var stats;
if(fs.existsSync(partial_data_folder) && (stats = fs.statSync(partial_data_folder)) && stats.isDirectory()) {
var files = fs.readdirSync(partial_data_folder)
files.forEach(function (name) {
var filename;//file name, which we use as the variable name
if (! (filename = name.match(format)) ) return;
data_files[filename[1]] = partial_data_folder + "/" + name;
})
}
for(var var_name in data_files) if(data_files.hasOwnProperty(var_name)) {
var new_data
try {
if(data_files[var_name].match(/\.json$/i)) {
new_data = fs.readFileSync(data_files[var_name] , 'utf-8');
new_data = JSON.parse(new_data);
} else if(data_files[var_name].match(/\.csv$/i)) {
//load csv data into an array
var csv_data = require(data_files[var_name]);
//now convert it to json
var csv_header = csv_data[0];
var length = csv_data.length;
var json_data = []
for(var i = 1 ; i < length; i++) {
var csv_row = csv_data[i];
var json_row = {}
for(var j = 0; j < csv_row.length; j++) {
json_row[csv_header[j]] = csv_row[j];
}
//for example if we have "status":"pending" , add this to it as well : "pending":true
if("status" in json_row) json_row[json_row["status"].toLowerCase()] = true;
json_data.push(json_row);
}
new_data = json_data
}
} catch(e) {
console.log("Invalid JSON Data File : " + data_files[var_name]);
continue;
}
$vars[var_name.replace(/\./g , '_')] = new_data
//here we replace '.' with '_' in variable names, so template compiler can recognize it as a variable not an object
//for example change sidebar.navList to sidebar_navList , because sidebar is not an object
}
return true;
}
//in our page's data file, we save short script/style names, which we must map to original file names
//this way we can easily only change the script-mapping file and changes will be reflected
var map_script_names = function() {
var mappables = ["script" , "style"]
for(var m in mappables) {
var which = mappables[m]
if($vars[which+'s']) {//if we have $vars["scripts"] or $vars["styles"]
var page_scripts = $vars[which+'s'];
var map_json = JSON.parse(fs.readFileSync($data_dir + "/common/"+which+"-mapping"+(params.path['minified'] ? '.min' : '')+".json"));
var mapped_scripts = [];
for(var i in page_scripts) {
if(page_scripts[i] in map_json) {
if(typeof map_json[page_scripts[i]] == "string") mapped_scripts.push(map_json[page_scripts[i]])
else if(typeof map_json[page_scripts[i]] == "object") //two or more scripts should be included for this to work, like dataTables, jQuery UI, etc ...
{
for(var m in map_json[page_scripts[i]])
mapped_scripts.push(map_json[page_scripts[i]][m])
}
}
}
$vars[which+'s'] = mapped_scripts;
if(('ie_'+which+'s') in $vars) {
var ie_scripts = $vars['ie_'+which+'s'];//ie_scripts || ie_styles
var ie_mapped_scripts = [];
for(var i in ie_scripts) if(map_json[ie_scripts[i].name])
{
ie_mapped_scripts.push({"version" : ie_scripts[i].version , "file_name" : map_json[ie_scripts[i].name]})
}
$vars['ie_'+which+'s'] = ie_mapped_scripts
}
}
}
}
this.get_template = function() {
var template_file = $views_dir+"/"+$type+"s/"+$name + '.mustache';
if(fs.existsSync(template_file)) {
return params.engine.compile(fs.readFileSync(template_file , 'utf-8'));
}
return null;
}
this.get_vars = function() {
return $vars;
}
this.get_var = function(name , undefined) {
return name in $vars ? $vars[name] : undefined;
}
this.get_name= function() {
return $name;
}
}
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