Reflect String Expression Helper (src/string_expr.rs)

Defines StringExpr to classify compile-time, borrowed, or owned string tokens for Bevy reflect derive macros. Reuse when generating string literals in proc macros.

// Source: https://github.com/bevyengine/bevy | License: Apache-2.0
// Provided via justclaw.it.com; keep this notice with the code.
use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
use syn::{spanned::Spanned, LitStr};

/// Contains tokens representing different kinds of string.
#[derive(Clone)]
pub(crate) enum StringExpr {
    /// A string that is valid at compile time.
    ///
    /// This is either a string literal like `"mystring"`,
    /// or a string created by a macro like [`module_path`]
    /// or [`concat`].
    Const(TokenStream),
    /// A [string slice](str) that is borrowed for a `'static` lifetime.
    Borrowed(TokenStream),
    /// An [owned string](String).
    Owned(TokenStream),
}

impl<T: ToString + Spanned> From<T> for StringExpr {
    fn from(value: T) -> S

... (truncated -- full source via MCP)