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// Doc Not Optimize
//! The `DispatcherPattern` matches invocations of the `dispatcher!` macro and
//! extracts the generated type names from its arguments. It supports:
//! - `Entry*` — the entry type (always generated)
//! - `__Dispatcher*` — the hidden dispatcher struct (always generated)
//! - `__internal_dispatcher_*` — the compile-time collected static (always generated)
//!
//! Supported forms:
//! - Explicit: `dispatcher!("greet", EntryGreet)`
//! - Implicit: `dispatcher!("greet")` — infers `EntryGreet`
//! - With braces: `dispatcher! { ... }`
//!
//! This pattern is used to track dispatcher types for code generation or analysis.
use syn::Item;
use crate::pattern_analyzer::{AnalyzeItem, AnalyzePattern};
/// Matches the `dispatcher!` macro, extracts:
/// - `Entry*` — the entry type (always)
/// - `__Dispatcher*` — the hidden dispatcher struct (always)
/// - `__internal_dispatcher_*` — the compile-time collected static (always)
#[derive(Default)]
pub struct DispatcherPattern;
impl DispatcherPattern {
/// Creates a new `DispatcherPattern`.
#[must_use]
pub const fn new() -> Self {
Self
}
}
/// Supported forms:
/// - `dispatcher!("greet", CMDGreet => EntryGreet)` — explicit
/// - `dispatcher!("greet")` — implicit, infers names
/// - `dispatcher! { ... }` — with braces
impl AnalyzePattern for DispatcherPattern {
fn contains(&self, content: &str) -> bool {
content.contains("dispatcher!")
}
fn analyze(&self, content: &str) -> Vec<AnalyzeItem> {
let Ok(syntax) = syn::parse_file(content) else {
return Vec::new();
};
let mut items = Vec::new();
for item in &syntax.items {
match item {
Item::Macro(m) => {
let macro_name = macro_simple_name(m);
if macro_name != "dispatcher" {
continue;
}
items.extend(extract_all_types(&m.mac.tokens, ""));
}
Item::Mod(item_mod) => {
if let Some((_, nested)) = &item_mod.content {
for n in nested {
if let Item::Macro(m) = n {
if macro_simple_name(m) != "dispatcher" {
continue;
}
items.extend(extract_all_types(
&m.mac.tokens,
&item_mod.ident.to_string(),
));
}
}
}
}
_ => {}
}
}
items
}
}
fn macro_simple_name(m: &syn::ItemMacro) -> String {
m.mac
.path
.segments
.last()
.map(|s| s.ident.to_string())
.unwrap_or_default()
}
/// Extracts all types generated by a `dispatcher!` call.
fn extract_all_types(tokens: &proc_macro2::TokenStream, module: &str) -> Vec<AnalyzeItem> {
let (cmd_name, entry_struct) = parse_dispatcher_args(tokens);
let Some(cmd_name) = cmd_name else {
return Vec::new();
};
let mut items = Vec::new();
// Entry type — always (derived from the command name in the implicit form)
let entry = entry_struct.unwrap_or_else(|| format!("Entry{}", to_pascal_case(&cmd_name)));
items.push(AnalyzeItem::local(module.to_string(), entry));
// Hidden dispatcher struct — always
let hidden_name = format!("__Dispatcher{}", to_pascal_case(&cmd_name));
items.push(AnalyzeItem::local(module.to_string(), hidden_name));
// __internal_dispatcher_* — the compile-time collected static
let internal_name = format!("__internal_dispatcher_{}", snake_case(&cmd_name));
items.push(AnalyzeItem::local(module.to_string(), internal_name));
items
}
/// Parses dispatcher arguments and returns (`command_name`, `entry_struct`).
fn parse_dispatcher_args(tokens: &proc_macro2::TokenStream) -> (Option<String>, Option<String>) {
let stream = tokens.to_string();
let Some(cmd_name) = extract_string_literal(&stream) else {
return (None, None);
};
// Explicit form: "name", EntryType — the entry is the first bare
// identifier after the string literal. (The old `CMD => Entry` form is
// no longer supported.)
let after_lit = {
let start = stream.find('"').unwrap_or_default();
&stream[start + cmd_name.len() + 2..]
};
let entry_type = after_lit
.split(|c: char| c.is_whitespace() || c == ',' || c == ')' || c == '}' || c == '=')
.map(str::trim)
.find(|s| !s.is_empty() && !s.starts_with('"'))
.map(str::to_string);
(Some(cmd_name), entry_type)
}
/// Extracts the first string literal from a token string.
fn extract_string_literal(s: &str) -> Option<String> {
let s = s.trim();
let start = s.find('"')?;
let rest = &s[start + 1..];
let end = rest.find('"')?;
Some(rest[..end].to_string())
}
fn to_pascal_case(s: &str) -> String {
s.split(['-', '_', '.'])
.filter(|s| !s.is_empty())
.map(|s| {
let mut c = s.chars();
c.next().map_or_else(String::new, |f| {
f.to_uppercase().collect::<String>() + c.as_str()
})
})
.collect()
}
/// Simple `snake_case` conversion (replaces `.`, `-` with `_`).
fn snake_case(s: &str) -> String {
s.replace(['.', '-'], "_").to_lowercase()
}
|
