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Remove only use of Source trait.

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This commit is contained in:
Tom Alexander 2023-09-23 17:59:13 -04:00
parent f25246556c
commit d4f27ef297
Signed by: talexander
GPG Key ID: D3A179C9A53C0EDE
1 changed files with 20 additions and 14 deletions
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34
src/compare/util.rs
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@ -1,5 +1,5 @@
use super::sexp::Token;
use crate::types::Source;
use crate::types::StandardProperties;
/// Check if the child string slice is a slice of the parent string slice.
fn is_slice_of(parent: &str, child: &str) -> bool {
@ -10,13 +10,16 @@ fn is_slice_of(parent: &str, child: &str) -> bool {
child_start >= parent_start && child_end <= parent_end
}
/// Get the offset into source that the rust object exists at.
/// Get the byte offset into source that the rust object exists at.
///
/// These offsets are zero-based unlike the elisp ones.
fn get_offsets<'s, S: Source<'s>>(source: &'s str, rust_object: &'s S) -> (usize, usize) {
let rust_object_source = rust_object.get_source();
assert!(is_slice_of(source, rust_object_source));
let offset = rust_object_source.as_ptr() as usize - source.as_ptr() as usize;
fn get_rust_byte_offsets<'s, S: StandardProperties<'s>>(
original_document: &'s str,
rust_ast_node: &'s S,
) -> (usize, usize) {
let rust_object_source = rust_ast_node.get_source();
debug_assert!(is_slice_of(original_document, rust_object_source));
let offset = rust_object_source.as_ptr() as usize - original_document.as_ptr() as usize;
let end = offset + rust_object_source.len();
(offset, end)
}
@ -40,24 +43,27 @@ pub(crate) fn assert_name<'s>(
Ok(())
}
pub(crate) fn assert_bounds<'s, S: Source<'s>>(
source: &'s str,
/// Assert that the character ranges defined by upstream org-mode's :standard-properties match the slices in Organic's StandardProperties.
///
/// This does **not** handle plain text because plain text is a special case.
pub(crate) fn assert_bounds<'s, S: StandardProperties<'s>>(
original_document: &'s str,
emacs: &'s Token<'s>,
rust: &'s S,
) -> Result<(), Box<dyn std::error::Error>> {
let standard_properties = get_emacs_standard_properties(emacs)?;
let standard_properties = get_emacs_standard_properties(emacs)?; // 1-based
let (begin, end) = (
standard_properties
.begin
.ok_or("Token should have a begin.")?,
standard_properties.end.ok_or("Token should have an end.")?,
);
let (rust_begin, rust_end) = get_offsets(source, rust);
let rust_begin_char_offset = (&source[..rust_begin]).chars().count();
let (rust_begin, rust_end) = get_rust_byte_offsets(original_document, rust); // 0-based
let rust_begin_char_offset = (&original_document[..rust_begin]).chars().count() + 1; // 1-based
let rust_end_char_offset =
rust_begin_char_offset + (&source[rust_begin..rust_end]).chars().count();
if (rust_begin_char_offset + 1) != begin || (rust_end_char_offset + 1) != end {
Err(format!("Rust bounds (in chars) ({rust_begin}, {rust_end}) do not match emacs bounds ({emacs_begin}, {emacs_end})", rust_begin = rust_begin_char_offset + 1, rust_end = rust_end_char_offset + 1, emacs_begin=begin, emacs_end=end))?;
rust_begin_char_offset + (&original_document[rust_begin..rust_end]).chars().count(); // 1-based
if rust_begin_char_offset != begin || rust_end_char_offset != end {
Err(format!("Rust bounds (in chars) ({rust_begin}, {rust_end}) do not match emacs bounds ({emacs_begin}, {emacs_end})", rust_begin = rust_begin_char_offset, rust_end = rust_end_char_offset, emacs_begin=begin, emacs_end=end))?;
}
Ok(())