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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::FheStringFind;
use crate::strings::ciphertext::ClearString;
use crate::{FheBool, FheUint32};
impl FheStringFind<&Self> for FheAsciiString {
/// find a substring inside a string
///
/// Returns the index of the first character of this string that matches the pattern
/// as well as a [FheBool] that encrypts `true` if the pattern was found.
///
/// # 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 is an fhe scheme", &client_key).unwrap();
/// let pattern = FheAsciiString::try_encrypt("fhe", &client_key).unwrap();
/// let (position, found) = string.find(&pattern);
///
/// assert!(found.decrypt(&client_key));
/// let pos: u32 = position.decrypt(&client_key);
/// assert_eq!(pos, 1);
/// ```
fn find(&self, pat: &Self) -> (FheUint32, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key
.string_key()
.find(&self.inner.on_cpu(), (&*pat.inner.on_cpu()).into());
(
FheUint32::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 strings find");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings find");
}
})
}
/// find a substring inside a string
///
/// Returns the index for the first character of the last match of the pattern in this string,
/// as well as a [FheBool] that encrypts `true` if the pattern was found.
///
/// # 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 is an fhe scheme", &client_key).unwrap();
/// let pattern = FheAsciiString::try_encrypt("fhe", &client_key).unwrap();
/// let (position, found) = string.rfind(&pattern);
///
/// assert!(found.decrypt(&client_key));
/// let pos: u32 = position.decrypt(&client_key);
/// assert_eq!(pos, 11);
/// ```
fn rfind(&self, pat: &Self) -> (FheUint32, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key
.string_key()
.rfind(&self.inner.on_cpu(), (&*pat.inner.on_cpu()).into());
(
FheUint32::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 strings rfind");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings rfind");
}
})
}
}
impl FheStringFind<&ClearString> for FheAsciiString {
/// find a substring inside a string
///
/// Returns the index of the first character of this string that matches the pattern
/// as well as a [FheBool] that encrypts `true` if the pattern was found.
///
/// # 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 is an fhe scheme", &client_key).unwrap();
/// let pattern = ClearString::new("fhe".into());
/// let (position, found) = string.find(&pattern);
///
/// assert!(found.decrypt(&client_key));
/// let pos: u32 = position.decrypt(&client_key);
/// assert_eq!(pos, 1);
/// ```
fn find(&self, pat: &ClearString) -> (FheUint32, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key.string_key().find(&self.inner.on_cpu(), pat.into());
(
FheUint32::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 strings find");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings find");
}
})
}
/// find a substring inside a string
///
/// Returns the index for the first character of the last match of the pattern in this string,
/// as well as a [FheBool] that encrypts `true` if the pattern was found.
///
/// # 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 is an fhe scheme", &client_key).unwrap();
/// let pattern = ClearString::new("fhe".into());
/// let (position, found) = string.rfind(&pattern);
///
/// assert!(found.decrypt(&client_key));
/// let pos: u32 = position.decrypt(&client_key);
/// assert_eq!(pos, 11);
/// ```
fn rfind(&self, pat: &ClearString) -> (FheUint32, FheBool) {
with_internal_keys(|keys| match keys {
InternalServerKey::Cpu(cpu_key) => {
let (inner, block) = cpu_key.string_key().rfind(&self.inner.on_cpu(), pat.into());
(
FheUint32::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 strings rfind");
}
#[cfg(feature = "hpu")]
InternalServerKey::Hpu(_) => {
panic!("hpu does not support strings rfind");
}
})
}
}