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Add great boy example (#48)

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* Progress towards mock MainPod verification

* add MockMainPod.pub_statements logic so that when originid==SELF it is replaced by self.id()

* Basic op checking for mock MainPOD

* More op checking

* wip

* feat: add great boy example

* feat: put examples under cfg(test)

---------

Co-authored-by: Ahmad <root@ahmadafuni.com>
Co-authored-by: arnaucube <git@arnaucube.com>
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Eduard S. 2025-02-11 13:54:26 +01:00 • committed by GitHub
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36
book/src/examples.md
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@ -99,30 +99,40 @@ statement loan_check(receiver: string):
A Good Boy Pod exposes one custom statement with one custom deduction rule.
```
statement good_boy(receiver: PubKey, good_boy_issuers: MerkleTree):
statement is_good_boy(user: PubKey, good_boy_issuers: MerkleTree):
- OR():
- AND(pod: Pod):
# A good boy issuer is my friend
- AND(pod: Pod, age: Int):
- eq(pod.type, SIGNATURE)
- contains(good_boy_issuers, pod.signer)
- eq(pod.friend, receiver)
# A good boy issuer says this user is a good boy
- eq(pod.user, user)
- eq(pod.age, age)
```
A Friend Pod exposes one custom statement with one custom deduction rule.
```
statement is_friend(good_boy: PubKey, friend: PubKey, good_boy_issuers: MerkleTree):
- OR():
- AND(friend_pod: Pod):
- eq(pod.type, SIGNATURE)
# The issuer is a good boy
- is_good_boy(good_boy, good_boy_issuers)
# A good boy says this is their friend
- eq(pod.signer, good_boy)
- eq(pod.friend, friend)
```
A Great Boy Pod exposes (in addition to the above) one new custom statement
with one custom deduction rule.
```
statement great_boy(receiver: PubKey, good_boy_issuers: MerkleTree):
statement is_great_boy(great_boy: PubKey, good_boy_issuers: MerkleTree):
- OR():
- AND(friend_pod_0: Pod, friend_pod_1: Pod):
# good boy 0 is my friend
- eq(friend_pod_0.type, SIGNATURE)
- good_boy(friend_pod_0.signer, good_boy_issuers)
- eq(friend_pod_0.friend, receiver)
# good boy 1 is my friend
- eq(friend_pod_1.type, SIGNATURE)
- good_boy(friend_pod_1.signer, good_boy_issuers)
- eq(friend_pod_1.friend, receiver)
# Two good boys consider this user their friend
- is_friend(friend_pod_0.signer, great_boy)
- is_friend(friend_pod_1.signer, great_boy)
# good boy 0 != good boy 1
- neq(friend_pod_0.signer, friend_pod_1.signer)
```