tesseract-rs 0.2.0

Rust bindings for Tesseract OCR with optional built-in compilation
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use std::str::Utf8Error;
use thiserror::Error;

/// Errors that can occur when using the Tesseract API.
#[derive(Error, Debug)]
pub enum TesseractError {
    #[error("Failed to initialize Tesseract")]
    InitError,
    #[error("Failed to set image")]
    SetImageError,
    #[error("OCR operation failed")]
    OcrError,
    #[error("Invalid UTF-8 in Tesseract output")]
    Utf8Error(#[from] Utf8Error),
    #[error("Failed to lock mutex")]
    MutexLockError,
    #[error("Failed to set variable")]
    SetVariableError,
    #[error("Failed to get variable")]
    GetVariableError,
    #[error("Null pointer error")]
    NullPointerError,
    #[error("Invalid parameter")]
    InvalidParameterError,
    #[error("Layout analysis failed")]
    AnalyseLayoutError,
    #[error("Page processing failed")]
    ProcessPagesError,
    #[error("I/O error")]
    IoError,
    #[error("Invalid dimensions")]
    InvalidDimensions,
    #[error("Invalid bytes per pixel")]
    InvalidBytesPerPixel,
    #[error("Invalid bytes per line")]
    InvalidBytesPerLine,
    #[error("Invalid image data")]
    InvalidImageData,
    #[error("Uninitialized error")]
    UninitializedError,
}

/// Result type for Tesseract operations.
pub type Result<T> = std::result::Result<T, TesseractError>;

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_all_error_display() {
        let cases = vec![
            (TesseractError::InitError, "Failed to initialize Tesseract"),
            (TesseractError::SetImageError, "Failed to set image"),
            (TesseractError::OcrError, "OCR operation failed"),
            (TesseractError::MutexLockError, "Failed to lock mutex"),
            (TesseractError::SetVariableError, "Failed to set variable"),
            (TesseractError::GetVariableError, "Failed to get variable"),
            (TesseractError::NullPointerError, "Null pointer error"),
            (TesseractError::InvalidParameterError, "Invalid parameter"),
            (TesseractError::AnalyseLayoutError, "Layout analysis failed"),
            (TesseractError::ProcessPagesError, "Page processing failed"),
            (TesseractError::IoError, "I/O error"),
            (TesseractError::InvalidDimensions, "Invalid dimensions"),
            (
                TesseractError::InvalidBytesPerPixel,
                "Invalid bytes per pixel",
            ),
            (
                TesseractError::InvalidBytesPerLine,
                "Invalid bytes per line",
            ),
            (TesseractError::InvalidImageData, "Invalid image data"),
            (TesseractError::UninitializedError, "Uninitialized error"),
        ];
        for (error, expected) in cases {
            assert_eq!(error.to_string(), expected, "Mismatch for {:?}", error);
        }
    }

    #[test]
    fn test_utf8_error_conversion() {
        let invalid_utf8 = vec![0xFF, 0xFE];
        let utf8_error = std::str::from_utf8(&invalid_utf8).unwrap_err();
        let tess_error: TesseractError = utf8_error.into();

        match tess_error {
            TesseractError::Utf8Error(_) => {}
            _ => panic!("Expected Utf8Error variant"),
        }
    }

    #[test]
    fn test_error_is_send_sync() {
        fn assert_send_sync<T: Send + Sync>() {}
        assert_send_sync::<TesseractError>();
    }
}