3
votes
Accepted
Convert address to string in LIGO
You cannot convert an address to a string in Michelson. You could cheat by going through pack and inspecting the binary representation but it is unlikely something you would want to do.
- 3,260
3
votes
How to convert hex string/bytes to ASCII characters
The bytes2Char function from the @taquito/utils package will convert these bytes to a string. The char2bytes is the counterpart that does the reverse.
3
votes
Which hash function is used when converting an address from raw bytes?
It’s not hashed. You simply need to compute the base58 translation with the right prefix.
Proof that it’s not hashed: this process is reversible.
- 3,260
2
votes
Accepted
How do you read and store a UTF-8 value in Michelson
Byte sequences in Michelson are written in hexadecimal with a leading 0x. To convert between this representation and reguar UTF8 strings, you can use any tool that is dumb enough to iterate over UTF8 ...
- 2,703
1
vote
Accepted
Why does calling sp.address() with a dynamic value inside an entrypoint fail?
That is not possible, sp.address(x) expects x to be a python string.
params.address is a michelson value of type string and michelson does not have any instruction to explicitly cast a string to an ...
- 3,923
1
vote
Accepted
Smartpy restrict entrypoint for originated addresses (KT1)
If you are specifically interested in the address of your caller there a simpler solution than the one proposed by @rodrigo-quelhas: sp.sender is an implicit account if and only if it is exactly sp....
- 2,703
1
vote
Smartpy restrict entrypoint for originated addresses (KT1)
You can use: https://github.com/RomarQ/tezos-sc-utils
Usage:
Utils = sp.io.import_script_from_url("https://raw.githubusercontent.com/RomarQ/tezos-sc-utils/main/smartpy/utils.py");
# And ...
- 3,923
1
vote
Accepted
How do you convert a string sent to an entrypoint into its byte representation?
I struggled on this for a while but finally reached a solution.
It's a bit hacky, but you just have to remove the 6 bytes that sp.pack prepends onto the bytes you actually want with sp.slice before ...
- 359
1
vote
How can I do string interpolation on smartpy?
def string_of_nat(params):
c = sp.map({x : str(x) for x in range(0, 10)})
x = sp.local('x', params)
res = sp.local('res', [])
sp.if x.value == 0:
res.value.push('0')
sp....
- 11
1
vote
Accepted
How can I do string interpolation on smartpy?
It is not possible to cast an int to a string in Michelson.
I recommend you to have static error messages, such as:
class Errors:
SOME_ERROR = "SOME_ERROR"
# some contract
class Contract(...
- 3,923
1
vote
Accepted
How are strings serialized in Tezos?
Strings are serialized as follows:
01 to indicate type string
Four bytes (eight hex chars) to indicate length of string: 0000000c=0x0c=12 in your case
The string represented by its ASCII values: ...
- 729
1
vote
Can I use escape characters in LIGO strings?
Yes, you can, using exactly the same syntax.
For instance, in CameLIGO, you could write let x = Bytes.pack "toto\n\x53woo".
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