use config::file_lines::LineRange;
use syntax::codemap::{BytePos, CodeMap, Span};
use visitor::SnippetProvider;
use comment::FindUncommented;
pub trait SpanUtils {
fn span_after(&self, original: Span, needle: &str) -> BytePos;
fn span_after_last(&self, original: Span, needle: &str) -> BytePos;
fn span_before(&self, original: Span, needle: &str) -> BytePos;
fn opt_span_after(&self, original: Span, needle: &str) -> Option<BytePos>;
fn opt_span_before(&self, original: Span, needle: &str) -> Option<BytePos>;
}
pub trait LineRangeUtils {
fn lookup_line_range(&self, span: Span) -> LineRange;
}
impl<'a> SpanUtils for SnippetProvider<'a> {
fn span_after(&self, original: Span, needle: &str) -> BytePos {
self.opt_span_after(original, needle).expect("bad span")
}
fn span_after_last(&self, original: Span, needle: &str) -> BytePos {
let snippet = self.span_to_snippet(original).unwrap();
let mut offset = 0;
while let Some(additional_offset) = snippet[offset..].find_uncommented(needle) {
offset += additional_offset + needle.len();
}
original.lo() + BytePos(offset as u32)
}
fn span_before(&self, original: Span, needle: &str) -> BytePos {
self.opt_span_before(original, needle).expect("bad span")
}
fn opt_span_after(&self, original: Span, needle: &str) -> Option<BytePos> {
self.opt_span_before(original, needle)
.map(|bytepos| bytepos + BytePos(needle.len() as u32))
}
fn opt_span_before(&self, original: Span, needle: &str) -> Option<BytePos> {
let snippet = self.span_to_snippet(original)?;
let offset = snippet.find_uncommented(needle)?;
Some(original.lo() + BytePos(offset as u32))
}
}
impl LineRangeUtils for CodeMap {
fn lookup_line_range(&self, span: Span) -> LineRange {
let lo = self.lookup_line(span.lo()).unwrap();
let hi = self.lookup_line(span.hi()).unwrap();
debug_assert_eq!(
lo.fm.name, hi.fm.name,
"span crossed file boundary: lo: {:?}, hi: {:?}",
lo, hi
);
LineRange {
file: lo.fm.clone(),
lo: lo.line + 1,
hi: hi.line + 1,
}
}
}