Editing Modding Tutorials/MayRequire

{{DISPLAYTITLE:MayRequire}}
{{:Modding_Tutorials/Under_Review}}

<code>MayRequire</code> is an [[Modding_Tutorials/Introduction_to_XML|XML attribute]] introduced alongside the [[Royalty DLC]] that allows for easy conditional loading of XML content. <code>MayRequire</code> makes it easier to load content that is optionally dependent on DLCs or other mods.

== Details ==

<code>MayRequire</code> is inserted as an XML attribute in a supported XML node with a value being one or more <code>packageId</code> values separated by commas.

The <code>packageId</code> for official DLCs are:

* Royalty: <code>Ludeon.RimWorld.Royalty</code>
* Ideology: <code>Ludeon.RimWorld.Ideology</code>
* Biotech: <code>Ludeon.RimWorld.Biotech</code>

The <code>packageId</code> for mods can be found in their [[About.xml]] file.

=== <code>MayRequireAnyOf</code> ===

By default, <code>MayRequire</code> will only allow the use of that node if ''all'' of the DLCs or mods it designates are loaded. If you instead want to load the specified node if ''any'' of the specified DLCs or mods are loaded, you can use <code>MayRequireAnyOf</code> instead.

== List Entries ==

<code>MayRequire</code> can be on any <code>li</code> node to only load that entry if the specified DLC or mod is loaded:

<div class="TutorialTableWrapper">
{| class="TutorialCodeTable"
! XML Example !! Description
|-
| <source lang="xml">
<ThingDef ParentName="BasePawn">
  <defName>Human</defName>
  <label>human</label>
  
  <!-- irrelevant nodes omitted -->
  
  <recipes>
    <li>ExciseCarcinoma</li>
    <li>AdministerMechSerumHealer</li>
    <li>RemoveBodyPart</li>
    <li>Euthanize</li>
    <li>Anesthetize</li>
    <li>CureScaria</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">Vasectomy</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">ReverseVasectomy</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">TubalLigation</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">ExtractOvum</li>
    <li MayRequire="Ludeon.RimWorld.Royalty">CureBloodRot</li>
    <li MayRequire="Ludeon.RimWorld.Royalty">CureAbasia</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">ExtractHemogenPack</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">BloodTransfusion</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">ImplantXenogerm</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">ImplantIUD</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">RemoveIUD</li>
    <li MayRequire="Ludeon.RimWorld.Biotech">TerminatePregnancy</li>
  </recipes>
  
  <!-- irrelevant nodes omitted -->
  
</ThingDef>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequire</code> is used in the Human [[Modding_Tutorials/ThingDef|ThingDef]] to set surgery recipes that are only relevant to specific DLCs. Without <code>MayRequire</code>, these would cause errors as the specified [[Modding_Tutorials/Defs|Defs]] only exist in their respective DLCs.
|-
| <source lang="xml">
<SurgeryOutcomeEffectDef Name="SurgeryOutcomeBase">
  <defName>SurgeryOutcomeBase</defName>
  <outcomes>
    <li Class="SurgeryOutcomeSuccess" />
    
    <!-- irrelevant nodes omitted -->
    
    <li Class="SurgeryOutcome_FailureWithHediff"  MayRequire="Ludeon.RimWorld.Biotech">
      <chance>0.03</chance>
      <failedHediff>Sterilized</failedHediff>
      <applyToRecipes>
        <li MayRequire="Ludeon.RimWorld.Biotech">ImplantIUD</li>
        <li MayRequire="Ludeon.RimWorld.Biotech">RemoveIUD</li>
      </applyToRecipes>
      <failure>true</failure>
      <totalDamage>10</totalDamage>
      <applyEffectsToPart>true</applyEffectsToPart>
      <letterLabel>Surgery failed on {PATIENT_labelShort}: Sterilized</letterLabel>
      <letterText>{SURGEON_labelShort} has failed while operating on {PATIENT_labelShort} ({RECIPE_label}), leaving {PATIENT_objective} sterile.</letterText>
    </li>
    
    <!-- irrelevant nodes omitted -->
    
  </outcomes>
  
  <!-- irrelevant nodes omitted -->
  
</SurgeryOutcomeEffectDef>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequire</code> is used in the list of possible surgery outcomes to add the possibility of accidentally sterilizing the patient as a result of a surgery failure.

Note that the use of <code>MayRequire</code> on the list nodes of the <code><applyToRecipes></code> is technically unnecessary as the entire outcome node would not have loaded without [[Biotech]] active.
|-
| <source lang="xml">
<AlienRace.ThingDef_AlienRace Name="ARR_RaceBase" ParentName="HumanRace" Abstract="True">

  <!-- irrelevant nodes omitted -->

  <comps>
    <li Class="ARimReborn.CompProperties_ClassUser" MayRequire="Aelanna.ARimReborn.ClassesAndJobs" />
  </comps>

  <inspectorTabs>
    <li MayRequire="Aelanna.ARimReborn.ClassesAndJobs">ARimReborn.ITab_Pawn_Classes</li>
  </inspectorTabs>

</AlienRace.ThingDef_AlienRace>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequire</code> can be used to omit entire code components.

In this modded example, both a ThingComp and an inspector tab are only added if a specific sub-mod is loaded.
|-
| <source lang="xml">
<Operation Class="PatchOperationSequence">
  <operations>
    <li Class="PatchOperationAdd" MayRequire="Ludeon.Rimworld.Biotech"> <!-- Only runs if Biotech is active -->
      <xpath>Defs/ThingDef[defName="MechGestator"]/recipes<xpath>
      <value>
        <li>MyCustomMech</li>
      </value>
    </li>
    <li Class="PatchOperationAdd" MayRequire="MyProject.OtherModPackageId"><!-- Only runs if the specific mod is active -->
      <xpath>Defs/ThingDef[defName="OtherModWorkbench"]/recipes</xpath>
      <value>
        <li>MyCustomResource</li>
      </value>
    </li>
  </operations>
</Operation>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequire</code> can be used in lieu of PatchOperationFindMod in a PatchOperationSequence.

'''Warning''': PatchOperationSequence can obfuscate errors, so it is strongly recommended that you individually test patches first before you place them in a sequence. Please see [[Modding_Tutorials/PatchOperations|PatchOperations]] for more information.
|-
|}
</div>

== Stat Blocks ==

<code>MayRequire</code> can be used by any <code>StatModifier</code> list, which includes all <code>statBases</code>, <code>statOffsets</code>, <code>statFactors</code>, and <code>equippedStatOffsets</code> nodes:

<div class="TutorialTableWrapper">
{| class="TutorialCodeTable"
! XML !! Description
|-
| <source lang="xml">
<ThingDef ParentName="ApparelMakeableBase">
  <defName>Apparel_Duster</defName>
  
  <!-- irrelevant tags omitted -->
  
  <equippedStatOffsets>
    <SlaveSuppressionOffset MayRequire="Ludeon.RimWorld.Ideology">-0.05</SlaveSuppressionOffset>
  </equippedStatOffsets>
  
  <!-- irrelevant tags omitted -->
</ThingDef>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequire</code> is used by several vanilla apparel [[Modding_Tutorial/ThingDef|ThingDef]]s to apply stats that are only relevant to DLCs, such as the [[Slavery|SlaveSuppressionOffset]] stat from [[Ideology]].
|-
| <source lang="xml">
<ThingDef Name="TorchLamp" ParentName="BuildingBase">
  <defName>TorchLamp</defName>
  <label>torch lamp</label>
  
  <!-- irrelevant nodes omitted -->
  
  <statBases>
    <MaxHitPoints>75</MaxHitPoints>
    <WorkToBuild>100</WorkToBuild>
    <Flammability>0</Flammability>
    <MeditationFocusStrength>0.0</MeditationFocusStrength>
    <StyleDominance MayRequire="Ludeon.RimWorld.Ideology">5</StyleDominance>
  </statBases>
  
  <!-- irrelevant nodes omitted -->
  
</ThingDef>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequire</code> is used by several vanilla buildings such as the torch lamp to determine how much that particular building influences the overall style of the room it is in. This is also an [[Ideology]] feature.
|-
|}
</div>

== Optional Defs ==

<code>MayRequire</code> can be used to conditionally load entire Defs. This is far easier to use than the prior option of using [[Modding_Tutorials/PatchOperations|PatchOperations]] to inject new Defs.

<div class="TutorialTableWrapper">
{| class="TutorialCodeTable"
! XML !! Description
|-
| <source lang="xml">
<StatDef ParentName="MeditationFocusBase" MayRequireAnyOf="Ludeon.RimWorld.Royalty,Ludeon.RimWorld.Biotech">
  <defName>MeditationFocusGain</defName>
  <label>meditation psyfocus gain</label>
  
  <!-- irrelevant content omitted -->
  
</StatDef>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequireAnyOf</code> is used to activate the MeditationFocusGain stat if either [[Royalty]] or [[Biotech]] is loaded.
|-
| <source lang="xml">
<ThingDef ParentName="ApparelMakeableBase" MayRequireAnyOf="Ludeon.RimWorld.Royalty,Ludeon.RimWorld.Biotech">
  <defName>Apparel_Cape</defName>
  <label>cape</label>
  
  <!-- irrelevant content omitted -->
  
</ThingDef>
</source>
| class="TutorialCodeTable-description" |
<code>MayRequireAnyOf</code> is used to activate the [[Cape]] apparel if either [[Royalty]] or [[Biotech]] is loaded.
|-
|}
</div>

[[Category:Modding]]
[[Category:Modding tutorials]]