i want to look at the code in magento where the shopping cart rules are checked and applied to the items in the cart before the checkout, i can find in the templates where the information is displayed but i can't find where it is checked if the cart rule should be applied
EDIT 1: by "shopping cart rules are checked" i mean "shopping cart price rules are checked" (maybe there 2 different types of shopping cart rules), i'm looking for the code that goes
"these 3 items that are in the cart meet the conditions of the shopping cart rule with the id of 15, i know need to update the item information as described by the actions provided that the items meet the conditions in the actions"
In the following module: Mage_Salesrule, specifically within app/code/core/Mage/SalesRule/Model/Rule.php