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extern crate libsyntax2;
mod extend_selection;
use libsyntax2::{
SyntaxNodeRef,
algo::walk,
SyntaxKind::*,
};
pub use libsyntax2::{TextRange, TextUnit};
pub struct File {
inner: libsyntax2::File
}
pub struct HighlightedRange {
pub range: TextRange,
pub tag: &'static str,
}
#[derive(Debug)]
pub struct Symbol {
// pub parent: ???,
pub name: String,
pub range: TextRange,
}
impl File {
pub fn new(text: &str) -> File {
File {
inner: libsyntax2::File::parse(text)
}
}
pub fn highlight(&self) -> Vec<HighlightedRange> {
let syntax = self.inner.syntax();
let mut res = Vec::new();
for node in walk::preorder(syntax.as_ref()) {
let tag = match node.kind() {
ERROR => "error",
COMMENT | DOC_COMMENT => "comment",
STRING | RAW_STRING | RAW_BYTE_STRING | BYTE_STRING => "string",
ATTR => "attribute",
NAME_REF => "text",
NAME => "function",
INT_NUMBER | FLOAT_NUMBER | CHAR | BYTE => "literal",
LIFETIME => "parameter",
k if k.is_keyword() => "keyword",
_ => continue,
};
res.push(HighlightedRange {
range: node.range(),
tag,
})
}
res
}
pub fn syntax_tree(&self) -> String {
::libsyntax2::utils::dump_tree(&self.inner.syntax())
}
pub fn symbols(&self) -> Vec<Symbol> {
let syntax = self.inner.syntax();
let res: Vec<Symbol> = walk::preorder(syntax.as_ref())
.filter_map(Declaration::cast)
.filter_map(|decl| {
let name = decl.name()?;
let range = decl.range();
Some(Symbol { name, range })
})
.collect();
res // NLL :-(
}
pub fn extend_selection(&self, range: TextRange) -> Option<TextRange> {
let syntax = self.inner.syntax();
extend_selection::extend_selection(syntax.as_ref(), range)
}
}
struct Declaration<'f>(SyntaxNodeRef<'f>);
impl<'f> Declaration<'f> {
fn cast(node: SyntaxNodeRef<'f>) -> Option<Declaration<'f>> {
match node.kind() {
| STRUCT_ITEM | ENUM_ITEM | FN_ITEM | TRAIT_ITEM
| CONST_ITEM | STATIC_ITEM | MOD_ITEM | NAMED_FIELD
| TYPE_ITEM => Some(Declaration(node)),
_ => None
}
}
fn name(&self) -> Option<String> {
let name = self.0.children()
.find(|child| child.kind() == NAME)?;
Some(name.text())
}
fn range(&self) -> TextRange {
self.0.range()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_extend_selection() {
let text = r#"fn foo() {
1 + 1
}
"#;
let file = File::new(text);
let range = TextRange::offset_len(18.into(), 0.into());
let range = file.extend_selection(range).unwrap();
assert_eq!(range, TextRange::from_to(17.into(), 18.into()));
let range = file.extend_selection(range).unwrap();
assert_eq!(range, TextRange::from_to(15.into(), 20.into()));
}
}
|
