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export default function extractCallback(cmd, payload, root = window) {
var command = cmd,
last_chunk = null,
callback = root,
previous = null;
// Try to decode URI component in case it is encoded
try {
command = window.decodeURIComponent(command);
} catch {
// No action necessary
}
// Try to parse value as JSON (value might be {func: 'foo', payload: {}})
try {
command = JSON.parse(command);
} catch {
command = { func: command };
}
// Check for invalid call
if (command.func === undefined) {
throw 'Dialog: Invalid value for X-Dialog-Execute';
}
// Populate payload if not set
if (command.payload === undefined) {
command.payload = payload;
}
// Find callback
command.func.trim().split(/\./).forEach(chunk => {
// Check if last chunk was unfinished
if (last_chunk !== null) {
chunk = last_chunk + '.' + chunk;
last_chunk = null;
}
// Check for not finished/closed chunk
if (chunk.match(/\([^)]*$/)) {
last_chunk = chunk;
return;
}
previous = callback;
var match = chunk.match(/\((.*)\);?$/),
parameters = null;
if (match !== null) {
chunk = chunk.replace(match[0], '');
try {
parameters = JSON.parse('[' + match[1].replace(/'/g, '"') + ']');
} catch {
console.log('error parsing json', match);
}
}
if (callback === null || callback[chunk] === undefined) {
console.log('Error: Undefined callback ' + cmd);
return;
}
if (typeof callback[chunk] === 'function' && parameters !== null) {
callback = callback[chunk].apply(callback, parameters);
} else {
callback = callback[chunk];
}
});
// Check callback
if (typeof callback !== 'function') {
return function() {
return callback;
};
}
return function(p) {
return callback.apply(previous, [p || command.payload]);
};
}
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