llmchain 0.1.3

A Rust framework for large language models, inspired by LangChain
Documentation 
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// Copyright 2023 Shafish Labs.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use parking_lot::RwLock;

use crate::Document;

#[derive(Debug)]
pub struct Documents {
    documents: RwLock<Vec<Document>>,
}

impl Documents {
    pub fn create() -> Self {
        Documents {
            documents: RwLock::new(vec![]),
        }
    }

    pub fn push(&self, document: Document) {
        self.documents.write().push(document);
    }

    pub fn extend(&self, other_docs: &Documents) {
        self.documents
            .write()
            .extend_from_slice(&other_docs.documents.read());
    }

    pub fn tokens(&self) -> usize {
        self.documents.read().iter().map(|d| d.tokens()).sum()
    }

    pub fn size(&self) -> usize {
        self.documents.read().iter().map(|d| d.size()).sum()
    }

    pub fn len(&self) -> usize {
        self.documents.read().len()
    }

    pub fn is_empty(&self) -> bool {
        self.documents.read().is_empty()
    }

    pub fn iter(&self) -> DocumentsIter {
        let guard = self.documents.read().clone();
        DocumentsIter {
            documents: guard,
            index: 0,
        }
    }

    pub fn first(&self) -> Option<Document> {
        let guard = self.documents.read();
        guard.first().cloned()
    }
}

impl FromIterator<Document> for Documents {
    fn from_iter<I: IntoIterator<Item = Document>>(iter: I) -> Self {
        Documents {
            documents: RwLock::new(iter.into_iter().collect()),
        }
    }
}

impl<'a> IntoIterator for &'a Documents {
    type Item = Document;
    type IntoIter = DocumentsIter;

    fn into_iter(self) -> Self::IntoIter {
        DocumentsIter {
            documents: self.documents.read().clone(),
            index: 0,
        }
    }
}

pub struct DocumentsIter {
    documents: Vec<Document>,
    index: usize,
}

impl Iterator for DocumentsIter {
    type Item = Document;

    fn next(&mut self) -> Option<Self::Item> {
        if self.index < self.documents.len() {
            let result = self.documents[self.index].clone();
            self.index += 1;
            Some(result)
        } else {
            None
        }
    }
}

impl From<Vec<Document>> for Documents {
    fn from(documents: Vec<Document>) -> Self {
        Documents {
            documents: RwLock::new(documents),
        }
    }
}