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Add support for include_str

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This commit is contained in:
Laurențiu Nicola 2020-06-27 15:31:19 +03:00
parent 6a067ce947
commit b4420626fb
3 changed files with 75 additions and 34 deletions
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38
crates/ra_hir_expand/src/builtin_macro.rs
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@ -99,6 +99,7 @@ register_builtin! {
EAGER:
(concat, Concat) => concat_expand,
(include, Include) => include_expand,
(include_str, IncludeStr) => include_str_expand,
(env, Env) => env_expand,
(option_env, OptionEnv) => option_env_expand
}
@ -292,11 +293,16 @@ fn concat_expand(
Ok((quote!(#text), FragmentKind::Expr))
}
fn relative_file(db: &dyn AstDatabase, call_id: MacroCallId, path: &str) -> Option<FileId> {
fn relative_file(
db: &dyn AstDatabase,
call_id: MacroCallId,
path: &str,
allow_recursion: bool,
) -> Option<FileId> {
let call_site = call_id.as_file().original_file(db);
let res = db.resolve_path(call_site, path)?;
// Prevent include itself
if res == call_site {
if res == call_site && !allow_recursion {
None
} else {
Some(res)
@ -319,8 +325,8 @@ fn include_expand(
tt: &tt::Subtree,
) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
let path = parse_string(tt)?;
let file_id =
relative_file(db, arg_id.into(), &path).ok_or_else(|| mbe::ExpandError::ConversionError)?;
let file_id = relative_file(db, arg_id.into(), &path, false)
.ok_or_else(|| mbe::ExpandError::ConversionError)?;
// FIXME:
// Handle include as expression
@ -331,6 +337,30 @@ fn include_expand(
Ok((res, FragmentKind::Items))
}
fn include_str_expand(
db: &dyn AstDatabase,
arg_id: EagerMacroId,
tt: &tt::Subtree,
) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
let path = parse_string(tt)?;
// FIXME: we're not able to read excluded files (which is most of them because
// it's unusual to `include_str!` a Rust file), but we can return an empty string.
// Ideally, we'd be able to offer a precise expansion if the user asks for macro
// expansion.
let file_id = match relative_file(db, arg_id.into(), &path, true) {
Some(file_id) => file_id,
None => {
return Ok((quote!(""), FragmentKind::Expr));
}
};
let text = db.file_text(file_id);
let text = &*text;
Ok((quote!(#text), FragmentKind::Expr))
}
fn get_env_inner(db: &dyn AstDatabase, arg_id: EagerMacroId, key: &str) -> Option<String> {
let krate = db.lookup_intern_eager_expansion(arg_id).krate;
db.crate_graph()[krate].env.get(key)