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//! LSP diagnostic utility types.
use serde::{Deserialize, Serialize};

/// Describes the severity level of a [`Diagnostic`].
#[derive(Debug, Clone, Copy, Eq, PartialEq, PartialOrd, Ord, Deserialize, Serialize)]
pub enum Severity {
    Hint,
    Info,
    Warning,
    Error,
}

impl Default for Severity {
    fn default() -> Self {
        Self::Hint
    }
}

/// A range of `char`s within the text.
#[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq)]
pub struct Range {
    pub start: usize,
    pub end: usize,
}

#[derive(Debug, Eq, Hash, PartialEq, Clone, Deserialize, Serialize)]
pub enum NumberOrString {
    Number(i32),
    String(String),
}

#[derive(Debug, Clone)]
pub enum DiagnosticTag {
    Unnecessary,
    Deprecated,
}

/// Corresponds to [`lsp_types::Diagnostic`](https://docs.rs/lsp-types/0.94.0/lsp_types/struct.Diagnostic.html)
#[derive(Debug, Clone)]
pub struct Diagnostic {
    pub range: Range,
    pub line: usize,
    pub message: String,
    pub severity: Option<Severity>,
    pub code: Option<NumberOrString>,
    pub language_server_id: usize,
    pub tags: Vec<DiagnosticTag>,
    pub source: Option<String>,
    pub data: Option<serde_json::Value>,
}