forked from mirrors/0ad
sanderd17
53 lines
1.9 KiB
JavaScript
53 lines
1.9 KiB
JavaScript
/**
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* This file contains shared logic for applying tech modifications in GUI, AI,
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* and simulation scripts. As such it must be fully deterministic and not store
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* any global state, but each context should do its own caching as needed.
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* Also it cannot directly access the simulation and requires data passed to it.
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*/
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/**
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* Returns modified property value modified by the applicable tech
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* modifications.
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*
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* @param currentTechModifications Object with mapping of property names to
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* modification arrays, retrieved from the intended player's TechnologyManager.
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* @param classes Array contianing the class list of the template.
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* @param propertyName String encoding the name of the value.
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* @param propertyValue Number storing the original value. Can also be
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* non-numberic, but then only "replace" techs can be supported.
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*/
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function GetTechModifiedProperty(currentTechModifications, classes, propertyName, propertyValue)
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{
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let modifications = currentTechModifications[propertyName] || [];
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let multiply = 1;
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let add = 0;
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for (let modification of modifications)
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{
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if (!DoesModificationApply(modification, classes))
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continue;
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if (modification.replace !== undefined)
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return modification.replace;
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if (modification.multiply)
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multiply *= modification.multiply;
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else if (modification.add)
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add += modification.add;
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else
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warn("GetTechModifiedProperty: modification format not recognised (modifying " + propertyName + "): " + uneval(modification));
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}
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// Note, some components pass non-numeric values (for which only the "replace" modification makes sense)
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if (typeof propertyValue == "number")
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return propertyValue * multiply + add;
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return propertyValue;
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}
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/**
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* Returns whether the given modification applies to the entity containing the given class list
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*/
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function DoesModificationApply(modification, classes)
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{
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return MatchesClassList(classes, modification.affects);
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}
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