# Advanced Conditions
Respackopts uses "conditions" for deciding what files to load.
Respackopts conditions are usually a simple string with a pack and entry name
(IE `<pack id>:<entry name>` or `<entry name>`),
however, respackopts provides various additional features to enhance their functionality.
This page will go over everything you can do with conditions

## (Boolean) logic
Any JSON object will be treated as a logical condition.
This behavior allows defining resources that are only used when a set of conditions are met,
not just one. Be aware that nesting logic operations is supported and recommended for advanced setups
The following expressions are supported:

| Example                                                         | Explaination                                                                                                        |
|-----------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------|
| `{"not": "examplePack:condition1"}`                             | True if the contained condition is false                                                                            |
| `{"and": ["examplePack:condition1", "examplePack:condition2"]}` | True if all contained conditions are true                                                                           |
| `{"or": ["examplePack:condition1", "examplePack:condition2"]}`  | True if any contained condition is true                                                                             |
| `{"nor": ["examplePack:condition1", "examplePack:condition2"]}` | True if none of the contained conditions are true                                                                   |
| `{"xor": ["examplePack:condition1", "examplePack:condition2"]}` | True if the number of contained conditions which are true is an odd number                                          |
| `{"eq": ["examplePack:condition1", "examplePack:condition2"]}`  | True if all contained conditions have the same value <br>(equivalent to `{"or": [{"and": [...]}, {"nor": [...]}]}`) |


## Built-in conditions
Respackopts provides some conditions by default, you can use them in any pack.

| Condition                      | Explaination                                                                                                                                                    |
|--------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `modversion:<mod>:<predicate>` | True if the specified mod is loaded (use the mod ID) and the version fits the predicate.<br>Example: `modversion:minecraft:>=1.7.10`, `modversion:continuity:*` |

## Fabric Resource Conditions Interop
Fabric API provides a system called resource conditions, which is similar to respackopts own system.
To improve compatibility, respackopts allows accessing fabric resource conditions and respackopts conditions from one another.

### Fabric Resource Conditions from Respackopts
A json object containing a singular entry whose key is `fabric:load_conditions` will be treated as a Fabric Resource Condition.

Example:
```json
{
  "condition": {
    "fabric:load_conditions": {
      "condition": "fabric:not",
      "value": {
        "condition": "fabric:all_mods_loaded",
        "values": [
          "a"
        ]
      }
    }
  }
}
```
### Respackopts conditions from Fabric
You may access respackopts conditions from Fabric API Resource Condition blocks by specifying a condition with the ID
`config`. Its value will be treated as a respackopts condition.

Please be aware that fabric resource conditions are not tied to resource packs and entry IDs must therefore be specified fully.
(Using `someTexture` instead of `examplePack:someTexture` is impossible)

Example:
```json
{
  "type": "minecraft:crafting_shapeless",
  "ingredients": [
    {
      "item": "minecraft:stick"
    }
  ],
  "result": {
    "item": "minecraft:diamond"
  },
  "fabric:conditions": [
    {
      "condition": "fabric:not",
      "value": {
        "condition": "respackopts:config",
        "value": {
          "and": [
            "examplePack:someTexture"
          ]
        }
      }
    }
  ]
}
```