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Fixed problem with widgets variable access

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Previously, widgets were reading variables from themselves or their
cascaded ancestors. That means that if a widget sets a variable and
then reads the same variable, it will get the same variable back. That
sounds reasonable, until you consider a widget that wants to modify a
variable - eg the tiddler macro. For example:

```
<$tiddler tiddler={{!!report}}>
<$transclude mode="block" />
</$tiddler>
```

Here we first evaluate the `{{!!report}}` reference, which involves
reading the currentTiddler variable, looking up the tiddler, and
retrieving it’s `report` field. The next the tiddler widget is
refreshed, it will use the newly set currentTiddler as the basis for
resolving the `{{!!reference}}` reference.

The fix is to get variables from ancestors, but continue to set them on
ourselves.
This commit is contained in:
Jermolene
2014-05-08 11:51:02 +01:00
parent 6ab68e0fca
commit e60fc9f81f
1 changed files with 12 additions and 10 deletions
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16
core/modules/widgets/widget.js
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@@ -89,17 +89,19 @@ defaultValue: default value if the variable is not defined
*/
Widget.prototype.getVariable = function(name,options) {
options = options || {};
var actualParams = options.params || [];
// If the variable doesn't exist then look for a macro module
if(!(name in this.variables)) {
return this.evaluateMacroModule(name,actualParams,options.defaultValue);
}
var variable = this.variables[name],
value = variable.value || "";
var actualParams = options.params || [],
parentWidget = this.parentWidget;
// Check for the variable defined in the parent widget (or an ancestor in the prototype chain)
if(parentWidget && name in parentWidget.variables) {
var variable = parentWidget.variables[name],
value = variable.value || options.defaultValue;
// Substitute any parameters specified in the definition
value = this.substituteVariableParameters(value,variable.params,actualParams);
value = this.substituteVariableReferences(value);
return value;
}
// If the variable doesn't exist in the parent widget then look for a macro module
return this.evaluateMacroModule(name,actualParams,options.defaultValue);
};
Widget.prototype.substituteVariableParameters = function(text,formalParams,actualParams) {