122 lines
No EOL
3.1 KiB
JavaScript
Executable file
122 lines
No EOL
3.1 KiB
JavaScript
Executable file
var grammar = require('./grammar');
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// customized util.format - discards excess arguments and can void middle ones
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var formatRegExp = /%[sdv%]/g;
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var format = function (formatStr) {
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var i = 1;
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var args = arguments;
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var len = args.length;
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return formatStr.replace(formatRegExp, function (x) {
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if (i >= len) {
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return x; // missing argument
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}
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var arg = args[i];
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i += 1;
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switch (x) {
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case '%%':
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return '%';
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case '%s':
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return String(arg);
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case '%d':
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return Number(arg);
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case '%v':
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return '';
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}
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});
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// NB: we discard excess arguments - they are typically undefined from makeLine
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};
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var makeLine = function (type, obj, location) {
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var str = obj.format instanceof Function ?
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(obj.format(obj.push ? location : location[obj.name])) :
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obj.format;
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var args = [type + '=' + str];
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if (obj.names) {
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for (var i = 0; i < obj.names.length; i += 1) {
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var n = obj.names[i];
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if (obj.name) {
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args.push(location[obj.name][n]);
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}
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else { // for mLine and push attributes
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args.push(location[obj.names[i]]);
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}
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}
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}
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else {
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args.push(location[obj.name]);
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}
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return format.apply(null, args);
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};
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// RFC specified order
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// TODO: extend this with all the rest
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var defaultOuterOrder = [
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'v', 'o', 's', 'i',
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'u', 'e', 'p', 'c',
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'b', 't', 'r', 'z', 'a'
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];
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var defaultInnerOrder = ['i', 'c', 'b', 'a'];
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module.exports = function (session, opts) {
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opts = opts || {};
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// ensure certain properties exist
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if (session.version == null) {
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session.version = 0; // 'v=0' must be there (only defined version atm)
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}
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if (session.name == null) {
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session.name = ' '; // 's= ' must be there if no meaningful name set
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}
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session.media.forEach(function (mLine) {
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if (mLine.payloads == null) {
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mLine.payloads = '';
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}
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});
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var outerOrder = opts.outerOrder || defaultOuterOrder;
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var innerOrder = opts.innerOrder || defaultInnerOrder;
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var sdp = [];
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// loop through outerOrder for matching properties on session
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outerOrder.forEach(function (type) {
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grammar[type].forEach(function (obj) {
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if (obj.name in session && session[obj.name] != null) {
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sdp.push(makeLine(type, obj, session));
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}
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else if (obj.push in session && session[obj.push] != null) {
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session[obj.push].forEach(function (el) {
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sdp.push(makeLine(type, obj, el));
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});
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}
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});
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});
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// then for each media line, follow the innerOrder
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session.media.forEach(function (mLine) {
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sdp.push(makeLine('m', grammar.m[0], mLine));
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innerOrder.forEach(function (type) {
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grammar[type].forEach(function (obj) {
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if (obj.name in mLine && mLine[obj.name] != null) {
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sdp.push(makeLine(type, obj, mLine));
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}
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else if (obj.push in mLine && mLine[obj.push] != null) {
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mLine[obj.push].forEach(function (el) {
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sdp.push(makeLine(type, obj, el));
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});
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}
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});
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});
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});
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return sdp.join('\r\n') + '\r\n';
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};
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//////////////////
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// WEBPACK FOOTER
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// ./~/sdp-transform/lib/writer.js
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// module id = 2885
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// module chunks = 4
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