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23 changes: 16 additions & 7 deletions tools/doc/json.js
Original file line number Diff line number Diff line change
Expand Up @@ -272,21 +272,30 @@ function parseSignature(text, sig) {
var params = text.match(paramExpr);
if (!params) return;
params = params[1];
// the [ is irrelevant. ] indicates optionalness.
params = params.replace(/\[/g, '');
params = params.split(/,/);
var optionalLevel = 0;
var optionalCharDict = {'[': 1, ' ': 0, ']': -1};
params.forEach(function(p, i, _) {
p = p.trim();
if (!p) return;
var param = sig.params[i];
var optional = false;
var def;
// [foo] -> optional
if (p.charAt(p.length - 1) === ']') {
optional = true;
p = p.replace(/\]/g, '');
p = p.trim();

// for grouped optional params such as someMethod(a[, b[, c]])
var pos;
for (pos = 0; pos < p.length; pos++) {
if (optionalCharDict[p[pos]] === undefined) { break; }
optionalLevel += optionalCharDict[p[pos]];
}
p = p.substring(pos);
optional = (optionalLevel > 0);
for (pos = p.length - 1; pos >= 0; pos--) {
if (optionalCharDict[p[pos]] === undefined) { break; }
optionalLevel += optionalCharDict[p[pos]];
}
p = p.substring(0, pos + 1);

var eq = p.indexOf('=');
if (eq !== -1) {
def = p.substr(eq + 1);
Expand Down