Rename CodeMap/FileMap to SourceMap/SourceFile

#2946

1 files changed, 92 insertions, 0 deletions

diff --git a/src/source_map.rs b/src/source_map.rs
new file mode 100644
index 00000000000..678e4fe4cc6
--- /dev/null
+++ b/src/source_map.rs
@@ -0,0 +1,92 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! This module contains utilities that work with the `SourceMap` from `libsyntax` / `syntex_syntax`.
+//! This includes extension traits and methods for looking up spans and line ranges for AST nodes.
+
+use config::file_lines::LineRange;
+use syntax::source_map::{BytePos, SourceMap, 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 {
+    /// Returns the `LineRange` that corresponds to `span` in `self`.
+    ///
+    /// # Panics
+    ///
+    /// Panics if `span` crosses a file boundary, which shouldn't happen.
+    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(&format!(
+            "bad span: {}: {}",
+            needle,
+            self.span_to_snippet(original).unwrap()
+        ))
+    }
+
+    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 SourceMap {
+    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
+        );
+
+        // Line numbers start at 1
+        LineRange {
+            file: lo.fm.clone(),
+            lo: lo.line + 1,
+            hi: hi.line + 1,
+        }
+    }
+}