Editing Policies modding

{{Version|2.6}}

This page is about how to modify existing and how to create new [[Policies]].

Policies are defined at "common/policies/xxx.txt".

== Data Structure ==
* '''potential''' - A block of [[Conditions]] to determine is an empire able to see this policy. If an empire can't see a policy, it won't have any of its options active. (Country scope)
* '''allow''' - A block of [[Conditions]] to determine is an empire able to change this policy. Vanilla use this to prevent switching diplomatic stance and war philosophy during a war. (Country scope)
* '''option''' - An instance that adds an option to this policy. Multiple allowed. A policy should have at least one valid option for each empire.
** '''name''' - A localisation key that determines the name and description of this option.
** '''icon''' - A reference to a GFX entry that determines the icon of this option. Only diplomatic stance has this. Other policy options will never have their icons displayed.
** '''potential''' & '''valid''' - Blocks of [[Conditions]] to determine is an empire able to see / choose this option. If either is rendered false while the empire have this option active, the empire will be forced out of it and switched to a valid choice of highest <code>ai_weight</code>, even for players. (Country scope)
** '''policy_flags = { flag_xxx flag_yyy }''' - A list of strings to be checked by the condition <code>has_policy_flag</code>. A policy option without any policy flags can't be checked by Conditions.
** '''modifier''' - A block of [[Modifiers]] that applies to the empire with this option active.
** '''on_enabled''' & '''on_disabled''' - Blocks of [[Effects]] to be executed to the empire when this option is selected / switched out. (Country scope)
** '''AI_weight''' - The AI will always choose a option of highest weight for each policy. The player will also have each policy fall into an option of highest <code>ai_weight</code> by default.

== Vanilla Example ==
This is the Diplomatic Stance policy.

 diplomatic_stance = {
 	potential = {
 		OR = {
 			is_country_type = default
 			is_country_type = fallen_empire
 			is_country_type = awakened_fallen_empire
 			is_country_type = primitive
 			is_country_type = awakened_marauders
 		}
 	}
 
 	option = {
 		name = "diplo_stance_belligerent"
 		icon = "GFX_diplomatic_stance_belligerent"
 
 		potential = {
 			OR = {
 				is_country_type = default
 				is_country_type = awakened_fallen_empire
 			}
 
 			is_homicidal = no # They have their own variants of this
 			NOT = { has_valid_civic = civic_inwards_perfection }
 		}
 
 		policy_flags = {
 			diplo_stance_belligerent
 		}
 
 		modifier = {
 			country_war_exhaustion_mult = -0.1
 			country_naval_cap_mult = 0.1
 			country_claim_influence_cost_mult = -0.1
 		}
 
 		ai_weight = {
 			weight = 10
 
 			modifier = {
 				factor = 0
 				NOT = { has_country_flag = has_encountered_other_empire }
 			}
 
 			...
 		}
 	}
 
 	option = {
 		name = "diplo_stance_cooperative"
 		icon = "GFX_diplomatic_stance_cooperative"
 
 		potential = {
 			OR = {
 				is_country_type = default
 				is_country_type = awakened_fallen_empire
 			}
 			is_unfriendly = no # Not homicidal or barbaric despoilers
 			NOT = { has_valid_civic = civic_inwards_perfection }
 		}
 
 		policy_flags = {
 			diplo_stance_cooperative
 		}
 
 		modifier = {
 			diplo_weight_mult = 0.25
 			envoy_improve_relations_mult = 0.5
 			country_border_friction_mult = -0.5
 		}
 
 		ai_weight = {
 			weight = 10
 
 			modifier = {
 				factor = 0
 				NOT = { has_country_flag = has_encountered_other_empire }
 			}
 
 			...
 		}
 	}
 
 	...
 
 }

== 相关的动态修改语句 ==
Conditions:
* <code>has_policy_flag = <policy flag key></code> - Checks if the empire has any active policy option with this policy flag.
* <code>last_changed_policy = <policy key></code> - Checks if the last policy the empire has changed was the specified policy. Used for on_action events.

Effects:
 # changes an empire's policy
 set_policy = {
 	policy = <policy key>
 	option = <policy option name>
 	cooldown = <yes/no> # determines should this effect set a 10-year cooldown of policy change
 }

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