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|
use syn::Item;
use crate::pattern_analyzer::{AnalyzeItem, AnalyzePattern};
/// Matches the `dispatcher!` macro, extracts:
/// - `Entry*` — the entry type (always)
/// - `CMD*` — the dispatcher struct (always)
/// - `__internal_dispatcher_*` — dispatch tree static (when `use_dispatch_tree` is true)
pub struct DispatcherPattern {
pub use_dispatch_tree: bool,
}
impl DispatcherPattern {
pub fn new(use_dispatch_tree: bool) -> Self {
Self { use_dispatch_tree }
}
}
/// 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, "", self.use_dispatch_tree));
}
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(),
self.use_dispatch_tree,
));
}
}
}
}
_ => {}
}
}
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,
use_dispatch_tree: bool,
) -> Vec<AnalyzeItem> {
let (cmd_name, cmd_struct, entry_struct) = parse_dispatcher_args(tokens);
let cmd_name = match cmd_name {
Some(n) => n,
None => return Vec::new(),
};
let mut items = Vec::new();
// Entry type — always
if let Some(ref entry) = entry_struct {
items.push(AnalyzeItem {
module: module.to_string(),
item_name: entry.clone(),
});
}
// CMD type — always
if let Some(ref cmd) = cmd_struct {
items.push(AnalyzeItem {
module: module.to_string(),
item_name: cmd.clone(),
});
}
// __internal_dispatcher_* — when configured
if use_dispatch_tree {
let internal_name = format!("__internal_dispatcher_{}", snake_case(&cmd_name));
items.push(AnalyzeItem {
module: module.to_string(),
item_name: internal_name,
});
}
items
}
/// Parses dispatcher arguments and returns (command_name, cmd_struct, entry_struct).
fn parse_dispatcher_args(
tokens: &proc_macro2::TokenStream,
) -> (Option<String>, Option<String>, Option<String>) {
let stream = tokens.to_string();
// Explicit form: "name", CMDType => EntryType
if let Some(arrow_idx) = stream.find("=>") {
// Extract command name
let before_arrow = &stream[..arrow_idx];
let cmd_name = extract_string_literal(before_arrow);
// Extract CMD type: the ident before `=>`
let before_arrow_trimmed = before_arrow.trim();
let cmd_type = before_arrow_trimmed
.split(|c: char| c.is_whitespace() || c == ',')
.filter_map(|s| {
let s = s.trim();
if s.starts_with('"') || s.is_empty() {
None
} else {
Some(s.to_string())
}
})
.next_back();
// Extract entry type: after `=>`
let after_arrow = stream[arrow_idx + 2..].trim();
let entry_type = after_arrow
.split(|c: char| c.is_whitespace() || c == ',' || c == ')' || c == '}')
.next()
.map(|s| s.trim().to_string())
.filter(|s| !s.is_empty());
return (cmd_name, cmd_type, entry_type);
}
// Implicit form: "name"
let cmd_name = match extract_string_literal(&stream) {
Some(n) => n,
None => return (None, None, None),
};
let pascal = to_pascal_case(&cmd_name);
(
Some(cmd_name),
Some(format!("CMD{pascal}")),
Some(format!("Entry{pascal}")),
)
}
/// 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();
match c.next() {
None => String::new(),
Some(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()
}
|
