ferritin-common 0.1.0

library for rustdoc navigation and search
Documentation 
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//! Version conversions for rustdoc-types formats
//!
//! Each module (e.g., `v56`) handles conversion from that version to the next (v56 -> v57).
//! Conversions can be chained: v55 -> v56 -> v57

pub mod v55;
pub mod v56;

use anyhow::{Context, Result};
use rustdoc_types::{Crate, FORMAT_VERSION};

/// Load rustdoc JSON and normalize to the current format version
///
/// This function:
/// 1. Parses the JSON to determine the format version
/// 2. Parses with the appropriate rustdoc-types version
/// 3. Converts through intermediate versions to reach FORMAT_VERSION (57)
pub fn load_and_normalize(json: &[u8]) -> Result<Crate> {
    // First, peek at the format version
    let version_check: serde_json::Value =
        serde_json::from_slice(json).context("Failed to parse JSON")?;

    let format_version = version_check
        .get("format_version")
        .and_then(|v| v.as_u64())
        .context("Missing or invalid format_version")? as u32;

    match format_version {
        FORMAT_VERSION => {
            // Already current version, parse directly
            serde_json::from_slice(json).context("Failed to parse as current format")
        }
        56 => {
            // Parse as v56, convert to v57
            let crate_56: rustdoc_types_56::Crate =
                serde_json::from_slice(json).context("Failed to parse as format version 56")?;
            v56::convert_crate(crate_56)
        }
        55 => {
            // Parse as v55, convert to v56, then to v57
            let crate_55: rustdoc_types_55::Crate =
                serde_json::from_slice(json).context("Failed to parse as format version 55")?;
            let crate_56 = v55::convert_crate(crate_55).context("Failed to convert v55 to v56")?;
            v56::convert_crate(crate_56)
        }
        v if v < 55 => {
            anyhow::bail!(
                "Format version {} is too old. Minimum supported version: 55, current version: {}",
                v,
                FORMAT_VERSION
            )
        }
        v => {
            anyhow::bail!(
                "Format version {} is too new. Maximum supported version: {}",
                v,
                FORMAT_VERSION
            )
        }
    }
}