SolidScribe/client/semantic/tasks/docs/metadata.js

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/*******************************
Summarize Docs
*******************************/
var
// node dependencies
console = require('better-console'),
fs = require('fs'),
YAML = require('yamljs')
;
var data = {};
/**
* Test for prefix in string.
* @param {string} str
* @param {string} prefix
* @return {boolean}
*/
function startsWith(str, prefix) {
return str.indexOf(prefix) === 0;
};
function inArray(needle, haystack) {
var length = haystack.length;
for(var i = 0; i < length; i++) {
if(haystack[i] == needle) return true;
}
return false;
}
/**
* Parses a file for metadata and stores result in data object.
* @param {File} file - object provided by map-stream.
* @param {function(?,File)} - callback provided by map-stream to
* reply when done.
*/
function parser(file, callback) {
// file exit conditions
if(file.isNull()) {
return callback(null, file); // pass along
}
if(file.isStream()) {
return callback(new Error('Streaming not supported'));
}
try {
var
/** @type {string} */
text = String(file.contents.toString('utf8')),
lines = text.split('\n'),
filename = file.path.substring(0, file.path.length - 4),
key = 'server/documents',
position = filename.indexOf(key)
;
// exit conditions
if(!lines) {
return;
}
if(position < 0) {
return callback(null, file);
}
filename = filename.substring(position + key.length + 1, filename.length);
var
lineCount = lines.length,
active = false,
yaml = [],
categories = [
'UI Element',
'UI Global',
'UI Collection',
'UI View',
'UI Module',
'UI Behavior'
],
index,
meta,
line
;
for(index = 0; index < lineCount; index++) {
line = lines[index];
// Wait for metadata block to begin
if(!active) {
if(startsWith(line, '---')) {
active = true;
}
continue;
}
// End of metadata block, stop parsing.
if(startsWith(line, '---')) {
break;
}
yaml.push(line);
}
// Parse yaml.
meta = YAML.parse(yaml.join('\n'));
if(meta && meta.type && meta.title && inArray(meta.type, categories) ) {
meta.category = meta.type;
meta.filename = filename;
meta.url = '/' + filename;
meta.title = meta.title;
// Primary key will by filepath
data[meta.element] = meta;
}
else {
// skip
// console.log(meta);
}
}
catch(error) {
console.log(error, filename);
}
callback(null, file);
}
/**
* Export function expected by map-stream.
*/
module.exports = {
result : data,
parser : parser
};