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use std::sync::Arc;
use ra_db::{LocalSyntaxPtr, LocationIntener};
use ra_syntax::{
TextRange, TextUnit, SourceFileNode, AstNode, SyntaxNode,
ast::{self, NameOwner},
};
use crate::{SourceRootId, module::ModuleId, SourceItemId, HirDatabase};
/// Def's are a core concept of hir. A `Def` is an Item (function, module, etc)
/// in a specific module.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct MacroCallId(u32);
ra_db::impl_numeric_id!(MacroCallId);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct MacroCallLoc {
pub(crate) source_root_id: SourceRootId,
pub(crate) module_id: ModuleId,
pub(crate) source_item_id: SourceItemId,
}
impl MacroCallId {
pub(crate) fn loc(
self,
db: &impl AsRef<LocationIntener<MacroCallLoc, MacroCallId>>,
) -> MacroCallLoc {
db.as_ref().id2loc(self)
}
}
impl MacroCallLoc {
#[allow(unused)]
pub(crate) fn id(
&self,
db: &impl AsRef<LocationIntener<MacroCallLoc, MacroCallId>>,
) -> MacroCallId {
db.as_ref().loc2id(&self)
}
}
// Hard-coded defs for now :-(
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum MacroDef {
CTry,
QueryGroup,
}
impl MacroDef {
pub fn ast_expand(macro_call: ast::MacroCall) -> Option<(TextUnit, MacroExpansion)> {
let (def, input) = MacroDef::from_call(macro_call)?;
let exp = def.expand(input)?;
let off = macro_call.token_tree()?.syntax().range().start();
Some((off, exp))
}
fn from_call(macro_call: ast::MacroCall) -> Option<(MacroDef, MacroInput)> {
let def = {
let path = macro_call.path()?;
let name_ref = path.segment()?.name_ref()?;
if name_ref.text() == "ctry" {
MacroDef::CTry
} else if name_ref.text() == "query_group" {
MacroDef::QueryGroup
} else {
return None;
}
};
let input = {
let arg = macro_call.token_tree()?.syntax();
MacroInput {
text: arg.text().to_string(),
}
};
Some((def, input))
}
fn expand(self, input: MacroInput) -> Option<MacroExpansion> {
match self {
MacroDef::CTry => self.expand_ctry(input),
MacroDef::QueryGroup => self.expand_query_group(input),
}
}
fn expand_ctry(self, input: MacroInput) -> Option<MacroExpansion> {
let text = format!(
r"
fn dummy() {{
match {} {{
None => return Ok(None),
Some(it) => it,
}}
}}",
input.text
);
let file = SourceFileNode::parse(&text);
let match_expr = file.syntax().descendants().find_map(ast::MatchExpr::cast)?;
let match_arg = match_expr.expr()?;
let ptr = LocalSyntaxPtr::new(match_arg.syntax());
let src_range = TextRange::offset_len(0.into(), TextUnit::of_str(&input.text));
let ranges_map = vec![(src_range, match_arg.syntax().range())];
let res = MacroExpansion {
text,
ranges_map,
ptr,
};
Some(res)
}
fn expand_query_group(self, input: MacroInput) -> Option<MacroExpansion> {
let anchor = "trait ";
let pos = input.text.find(anchor)? + anchor.len();
let trait_name = input.text[pos..]
.chars()
.take_while(|c| c.is_alphabetic())
.collect::<String>();
if trait_name.is_empty() {
return None;
}
let src_range = TextRange::offset_len((pos as u32).into(), TextUnit::of_str(&trait_name));
let text = format!(r"trait {} {{ }}", trait_name);
let file = SourceFileNode::parse(&text);
let trait_def = file.syntax().descendants().find_map(ast::TraitDef::cast)?;
let name = trait_def.name()?;
let ptr = LocalSyntaxPtr::new(trait_def.syntax());
let ranges_map = vec![(src_range, name.syntax().range())];
let res = MacroExpansion {
text,
ranges_map,
ptr,
};
Some(res)
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct MacroInput {
// Should be token trees
pub text: String,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct MacroExpansion {
text: String,
ranges_map: Vec<(TextRange, TextRange)>,
ptr: LocalSyntaxPtr,
}
impl MacroExpansion {
pub fn file(&self) -> SourceFileNode {
SourceFileNode::parse(&self.text)
}
pub fn syntax(&self) -> SyntaxNode {
self.ptr.resolve(&self.file())
}
pub fn map_range_back(&self, tgt_range: TextRange) -> Option<TextRange> {
for (s_range, t_range) in self.ranges_map.iter() {
if tgt_range.is_subrange(&t_range) {
let tgt_at_zero_range = tgt_range - tgt_range.start();
let tgt_range_offset = tgt_range.start() - t_range.start();
let src_range = tgt_at_zero_range + tgt_range_offset + s_range.start();
return Some(src_range);
}
}
None
}
pub fn map_range_forward(&self, src_range: TextRange) -> Option<TextRange> {
for (s_range, t_range) in self.ranges_map.iter() {
if src_range.is_subrange(&s_range) {
let src_at_zero_range = src_range - src_range.start();
let src_range_offset = src_range.start() - s_range.start();
let src_range = src_at_zero_range + src_range_offset + t_range.start();
return Some(src_range);
}
}
None
}
}
pub(crate) fn expand_macro_invocation(
db: &impl HirDatabase,
invoc: MacroCallId,
) -> Option<Arc<MacroExpansion>> {
let loc = invoc.loc(db);
let syntax = db.file_item(loc.source_item_id);
let syntax = syntax.borrowed();
let macro_call = ast::MacroCall::cast(syntax).unwrap();
let (def, input) = MacroDef::from_call(macro_call)?;
def.expand(input).map(Arc::new)
}
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