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Bracket Handlers or BracketExpressionParser (BEP for short) are pieces of code that reference game objects (or create new objects) such as Items, Blocks or Resource Locations.
An example of a Bracket Handler would be the Item Bracket Handler:
That references the Diamond Item in the game.
Link to general-format
Bracket Handlers always start with their type, so an Item Bracket Handler starts with
item and a Block Bracket Handler starts with
The general format for Bracket Handlers are:
As stated above,
type is what kind of Bracket Handler is being called.
modid is the mod that owns the object.
name is the name of the object being referenced.
Some more examples are:
<block:minecraft:white_wool> // References the White Wool Block. <item:minecraft:white_wool> // References the White Wool Item. <fluid:minecraft:water> // References the Water Fluid. <effect:minecraft:haste> // References the Haste Potion Effect.
While the format above is used most of the time, there are some instances where there just isn't a need for the modid.
Link to modless-formats
In cases where a modid isn't needed to reference an object (Such as Text Formatting, where mods can't add new objects), a different format is used.
Some examples of this are:
<blockmaterial:earth> // References the Earth Block Material. <directionaxis:x> // References the X Direction Axis. <entityclassification:monster> // References the Monster Entity Classification.
Link to tag-format
Note: This is talking about the Vanilla Data Pack Tag
Link to note-this-is-talking-about-the-vanilla-data-pack-tag
Tags are special and need another layer of categorization, as a tag with the name
minecraft:white_wool could be referring to both an ItemTag and a BlockTag.
The format used on Tags is:
Examples of this are:
<tag:items:minecraft:white_wool> // References the White Wool Item Tag. <tag:blocks:minecraft:white_wool> // References the White Wool Block Tag. <tag:fluids:minecraft:water> // References the Water Fluid Tag.
Link to other-formats
At the end of the day, Bracket Handlers don't have a fully defined format, a mod could come along and add a Bracket Handler in a completely different format than listed here, the ones listed here are just the ones used in CraftTweaker itself and to listed to try and give an understanding of how Bracket Handlers look.
Getting Bracket Handlers
Link to getting-bracket-handlers
Since mods can add their own Bracket Handlers, it is impossible to list them all here, there is a command in-game that will output a list of all Bracket Handlers and their values though! Simply use
/ct dumpBrackets and look in the newly created
ct_dumps folder for them!