use std::rc::Rc;
use syntax::codemap::{BytePos, CodeMap, FileMap, Span};
use comment::FindUncommented;
pub struct LineRange {
pub file: Rc<FileMap>,
pub lo: usize,
pub hi: usize,
}
impl LineRange {
pub fn file_name(&self) -> &str {
self.file.as_ref().name.as_str()
}
}
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;
}
pub trait LineRangeUtils {
fn lookup_line_range(&self, span: Span) -> LineRange;
}
impl SpanUtils for CodeMap {
fn span_after(&self, original: Span, needle: &str) -> BytePos {
let snippet = self.span_to_snippet(original).unwrap();
let offset = snippet.find_uncommented(needle).unwrap() + needle.len();
original.lo + BytePos(offset as u32)
}
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 {
let snippet = self.span_to_snippet(original).unwrap();
let offset = snippet.find_uncommented(needle).unwrap();
original.lo + BytePos(offset as u32)
}
}
impl LineRangeUtils for CodeMap {
fn lookup_line_range(&self, span: Span) -> LineRange {
let lo = self.lookup_char_pos(span.lo);
let hi = self.lookup_char_pos(span.hi);
assert!(
lo.file.name == hi.file.name,
"span crossed file boundary: lo: {:?}, hi: {:?}",
lo,
hi
);
LineRange {
file: lo.file.clone(),
lo: lo.line,
hi: hi.line,
}
}
}