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'use strict';
module.exports.parse = parse;
module.exports.generate = generate;
// TODO(jamestalmage): Allow full range of identifier characters instead of just ASCII
//
// This will likely require a build step
//
// SPEC: http://www.ecma-international.org/ecma-262/5.1/#sec-7.6
//
// TOOLING:
// https://github.com/mathiasbynens/regenerate
// https://www.npmjs.com/package/regjsgen
var regex = /^\s*(?:([A-Za-z$_][A-Za-z0-9$_]*)\s*\.)?\s*([A-Za-z$_][A-Za-z0-9$_]*)\s*\(\s*((?:[A-Za-z$_][A-Za-z0-9$_]*)|(?:\[\s*[A-Za-z$_][A-Za-z0-9$_]*\s*]))?((?:\s*,\s*(?:(?:[A-Za-z$_][A-Za-z0-9$_]*)|(?:\[\s*[A-Za-z$_][A-Za-z0-9$_]*\s*])))+)?\s*\)\s*$/;
function parse(str) {
var match = regex.exec(str);
if (!match) {
return null;
}
var callee;
if (match[1]) {
callee = {
type: 'MemberExpression',
object: match[1],
member: match[2]
};
} else {
callee = {
type: 'Identifier',
name: match[2]
};
}
var args = match[4] || '';
args = args.split(',');
if (match[3]) {
args[0] = match[3];
}
var trimmed = [];
args.forEach(function (str) {
var optional = false;
str = str.replace(/\s+/g, '');
if (!str.length) {
return;
}
if (str.charAt(0) === '[' && str.charAt(str.length - 1) === ']') {
optional = true;
str = str.substring(1, str.length - 1);
}
trimmed.push({
name: str,
optional: optional
});
});
return {
callee: callee,
args: trimmed
};
}
function generate(parsed) {
var callee;
if (parsed.callee.type === 'MemberExpression') {
callee = [
parsed.callee.object,
'.',
parsed.callee.member
];
} else {
callee = [parsed.callee.name];
}
return callee.concat([
'(',
parsed.args.map(function (arg) {
return arg.optional ? '[' + arg.name + ']' : arg.name;
}).join(', '),
')'
]).join('');
}
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