audb 0.1.11

AuDB - Compile-time database application framework with gold files
Documentation 
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//! Error types for AuDB core

use std::fmt;
use std::io;
use std::path::PathBuf;

/// Result type alias for AuDB operations
pub type Result<T> = std::result::Result<T, Error>;

/// Core error type for AuDB
#[derive(Debug)]
pub enum Error {
    /// I/O error (file not found, permissions, etc.)
    Io(io::Error),

    /// Parse error in gold file
    Parse {
        file: PathBuf,
        line: usize,
        column: usize,
        message: String,
    },

    /// Validation error (schema mismatch, type error, etc.)
    Validation {
        message: String,
        context: Option<String>,
    },

    /// Schema error (duplicate schema, invalid field, etc.)
    Schema {
        schema_name: String,
        message: String,
    },

    /// Query error (invalid syntax, type mismatch, etc.)
    Query { query_name: String, message: String },

    /// Configuration error
    Config { message: String },

    /// Code generation error
    CodeGen { message: String },

    /// Project error (missing files, invalid structure, etc.)
    Project { message: String },

    /// Generic error for other cases
    Generic(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Error::Io(err) => write!(f, "I/O error: {}", err),
            Error::Parse {
                file,
                line,
                column,
                message,
            } => write!(
                f,
                "Parse error in {}:{}:{}: {}",
                file.display(),
                line,
                column,
                message
            ),
            Error::Validation { message, context } => {
                if let Some(ctx) = context {
                    write!(f, "Validation error in {}: {}", ctx, message)
                } else {
                    write!(f, "Validation error: {}", message)
                }
            }
            Error::Schema {
                schema_name,
                message,
            } => write!(f, "Schema error in '{}': {}", schema_name, message),
            Error::Query {
                query_name,
                message,
            } => write!(f, "Query error in '{}': {}", query_name, message),
            Error::Config { message } => write!(f, "Configuration error: {}", message),
            Error::CodeGen { message } => write!(f, "Code generation error: {}", message),
            Error::Project { message } => write!(f, "Project error: {}", message),
            Error::Generic(msg) => write!(f, "{}", msg),
        }
    }
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            Error::Io(err) => Some(err),
            _ => None,
        }
    }
}

impl From<io::Error> for Error {
    fn from(err: io::Error) -> Self {
        Error::Io(err)
    }
}

impl From<String> for Error {
    fn from(msg: String) -> Self {
        Error::Generic(msg)
    }
}

impl From<&str> for Error {
    fn from(msg: &str) -> Self {
        Error::Generic(msg.to_string())
    }
}

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

    #[test]
    fn test_error_display() {
        let err = Error::Generic("test error".to_string());
        assert_eq!(err.to_string(), "test error");
    }

    #[test]
    fn test_parse_error_display() {
        let err = Error::Parse {
            file: PathBuf::from("test.au"),
            line: 10,
            column: 5,
            message: "unexpected token".to_string(),
        };
        assert!(err.to_string().contains("test.au"));
        assert!(err.to_string().contains("10:5"));
    }

    #[test]
    fn test_schema_error_display() {
        let err = Error::Schema {
            schema_name: "User".to_string(),
            message: "duplicate field 'id'".to_string(),
        };
        assert!(err.to_string().contains("User"));
        assert!(err.to_string().contains("duplicate field"));
    }
}