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use crate::high_level_api::global_state::with_internal_keys;
use crate::high_level_api::keys::InternalServerKey;
use crate::high_level_api::re_randomization::ReRandomizationMetadata;
use crate::high_level_api::strings::ascii::FheAsciiString;
use crate::high_level_api::strings::traits::FheStringStrip;
use crate::high_level_api::FheBool;
use crate::strings::ciphertext::ClearString;
impl FheStringStrip<&Self> for FheAsciiString {
/// If the pattern does match the start of the string, returns a new encrypted string
/// with the specified pattern stripped from the start, and boolean set to `true`,
/// indicating the equivalent of `Some(_)`
///
/// If the pattern does not match the start of the string, returns the original encrypted
/// string and a boolean set to `false`, indicating the equivalent of `None`.
///
/// # Example
///
/// ```rust
/// use tfhe::prelude::*;
/// use tfhe::{generate_keys, set_server_key, ConfigBuilder, FheAsciiString};
///
/// let (client_key, server_key) = generate_keys(ConfigBuilder::default());
/// set_server_key(server_key);
///
/// let string = FheAsciiString::try_encrypt("tfhe-rs", &client_key).unwrap();
/// let pattern = FheAsciiString::try_encrypt("tfhe", &client_key).unwrap();
/// let (stripped, is_stripped) = string.strip_prefix(&pattern);
///
/// assert!(is_stripped.decrypt(&client_key));
///
/// let dec = stripped.decrypt(&client_key);
/// assert_eq!(&dec, "-rs");
/// ```
fn strip_prefix<'a>(&self, pat: &Self) -> (Self, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key
.string_key()
.strip_prefix(&self.inner.on_cpu(), (&*pat.inner.on_cpu()).into());
(
Self::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
FheBool::new(
block,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strip_prefix");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings strip_prefix");
}
})
}
/// If the pattern does match the end of the string, returns a new encrypted string
/// with the specified pattern stripped from the end, and boolean set to `true`,
/// indicating the equivalent of `Some(_)`
///
/// If the pattern does not match the end of the string, returns the original encrypted
/// string and a boolean set to `false`, indicating the equivalent of `None`.
///
/// # Example
///
/// ```rust
/// use tfhe::prelude::*;
/// use tfhe::{generate_keys, set_server_key, ConfigBuilder, FheAsciiString};
///
/// let (client_key, server_key) = generate_keys(ConfigBuilder::default());
/// set_server_key(server_key);
///
/// let string = FheAsciiString::try_encrypt("tfhe-rs", &client_key).unwrap();
/// let pattern = FheAsciiString::try_encrypt("tfhe", &client_key).unwrap();
/// let (stripped, is_stripped) = string.strip_suffix(&pattern);
///
/// assert!(!is_stripped.decrypt(&client_key));
///
/// let dec = stripped.decrypt(&client_key);
/// assert_eq!(&dec, "tfhe-rs");
/// ```
fn strip_suffix<'a>(&self, pat: &Self) -> (Self, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key
.string_key()
.strip_suffix(&self.inner.on_cpu(), (&*pat.inner.on_cpu()).into());
(
Self::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
FheBool::new(
block,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strip_suffix");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings string_suffix");
}
})
}
}
impl FheStringStrip<&ClearString> for FheAsciiString {
/// If the pattern does match the start of the string, returns a new encrypted string
/// with the specified pattern stripped from the start, and boolean set to `true`,
/// indicating the equivalent of `Some(_)`
///
/// If the pattern does not match the start of the string, returns the original encrypted
/// string and a boolean set to `false`, indicating the equivalent of `None`.
///
/// # Example
///
/// ```rust
/// use tfhe::prelude::*;
/// use tfhe::{generate_keys, set_server_key, ClearString, ConfigBuilder, FheAsciiString};
///
/// let (client_key, server_key) = generate_keys(ConfigBuilder::default());
/// set_server_key(server_key);
///
/// let string = FheAsciiString::try_encrypt("tfhe-rs", &client_key).unwrap();
/// let pattern = ClearString::new("tfhe".into());
/// let (stripped, is_stripped) = string.strip_prefix(&pattern);
///
/// assert!(is_stripped.decrypt(&client_key));
///
/// let dec = stripped.decrypt(&client_key);
/// assert_eq!(&dec, "-rs");
/// ```
fn strip_prefix<'a>(&self, pat: &ClearString) -> (Self, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key
.string_key()
.strip_prefix(&self.inner.on_cpu(), pat.into());
(
Self::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
FheBool::new(
block,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strip_prefix");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings strip_prefix");
}
})
}
/// If the pattern does match the end of the string, returns a new encrypted string
/// with the specified pattern stripped from the end, and boolean set to `true`,
/// indicating the equivalent of `Some(_)`
///
/// If the pattern does not match the end of the string, returns the original encrypted
/// string and a boolean set to `false`, indicating the equivalent of `None`.
///
/// # Example
///
/// ```rust
/// use tfhe::prelude::*;
/// use tfhe::{generate_keys, set_server_key, ClearString, ConfigBuilder, FheAsciiString};
///
/// let (client_key, server_key) = generate_keys(ConfigBuilder::default());
/// set_server_key(server_key);
///
/// let string = FheAsciiString::try_encrypt("tfhe-rs", &client_key).unwrap();
/// let pattern = ClearString::new("tfhe".into());
/// let (stripped, is_stripped) = string.strip_suffix(&pattern);
///
/// assert!(!is_stripped.decrypt(&client_key));
///
/// let dec = stripped.decrypt(&client_key);
/// assert_eq!(&dec, "tfhe-rs");
/// ```
fn strip_suffix<'a>(&self, pat: &ClearString) -> (Self, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key
.string_key()
.strip_suffix(&self.inner.on_cpu(), pat.into());
(
Self::new(
inner,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
FheBool::new(
block,
cpu_key.tag.clone(),
ReRandomizationMetadata::default(),
),
)
}
#[cfg(feature = "gpu")]
InternalServerKey::Cuda(_) => {
panic!("gpu does not support strip_suffix");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings strip_suffix");
}
})
}
}