Directives

Every Ride script should start with directives for the compiler. The directives define the script format and available built-in functions, structures, and variables.

Directive format is as follows:

{-# DIRECTIVE_NAME VALUE #-}

Directives List

Directive name	Description	Possible values
STDLIB_VERSION	Version of the Standard Library	8: enabled by feature #22 “Light Node” 7: enabled by feature #19 “Block Reward Distribution” 6: enabled by feature #17 “Ride V6, MetaMask support” 5: enabled by feature #16 “Ride V5, dApp-to-dApp invocations” 4: enabled by feature #15 “Ride V4, VRF, Protobuf, Failed transactions” 3 2 1
CONTENT_TYPE	Script content type	DAPP: the script is a set of definitions and contains functions that can be invoked from another account. EXPRESSION: the script is a boolean expression expression used for transaction verification
SCRIPT_TYPE	Script usage	ACCOUNT: the script is assigned to account ASSET: the script is assigned to asset LIBRARY: the script can be imported into other scripts as a library
IMPORT	Libraries to import	Names of the libraries saved in Waves IDE

Directives Examples

For a dApp script:

{-# STDLIB_VERSION 8 #-}
{-# CONTENT_TYPE DAPP #-}
{-# SCRIPT_TYPE ACCOUNT #-}

For an account script:

{-# STDLIB_VERSION 8 #-}
{-# CONTENT_TYPE EXPRESSION #-}
{-# SCRIPT_TYPE ACCOUNT #-}

For an asset script:

{-# STDLIB_VERSION 8 #-}
{-# CONTENT_TYPE EXPRESSION #-}
{-# SCRIPT_TYPE ASSET #-}

For a library script:

{-# STDLIB_VERSION 8 #-}
{-# CONTENT_TYPE LIBRARY #-}
{-# SCRIPT_TYPE ACCOUNT #-}

Not all the combinations of directives are correct. The example below will not work, because DAPP content type is allowed only for accounts:

# Wrong example, will not work

{-# STDLIB_VERSION 8 #-}
{-# CONTENT_TYPE DAPP #-}
{-# SCRIPT_TYPE ASSET #-}