ppErrorPreprocess Make use of the existing Error::Preprocess

Before this commit, inputs with invalid pp syntax are reported using
`Error::Parse` which is also used to report invalid post-pp syntax.
In svlint/svls, `Error::Parse` is reported to the user as "parse error"
without specifying if that's pre or post pp.
This commit makes it possible for future versions of svlint/svls to report
"preprocess error", thus helping users to identify pp issues.

- `Error::Preprocess` appears to be defined but unused.
- Add the argument `Option<(PathBuf, usize)>` to `Error::Preprocess`, same
  as `Error::Parse`.
- Update `preprocess_str()` to use `Error::Preprocess` in all 5 instances.

sv-parser-error/src/lib.rs

@@ -7,29 +7,38 @@ use thiserror::Error;
 pub enum Error {
     #[error("IO error: {0}")]
     Io(#[from] std::io::Error),
+
     #[error("File error: {path:?}")]
     File {
         #[source]
         source: std::io::Error,
         path: PathBuf,
     },
+
     #[error("Include error")]
     Include {
         #[from]
         source: Box<Error>,
     },
+
     #[error("Parse error: {0:?}")]
     Parse(Option<(PathBuf, usize)>),
-    #[error("Preprocess error")]
+
-    Preprocess,
+    #[error("Preprocess error: {0:?}")]
+    Preprocess(Option<(PathBuf, usize)>),
+
     #[error("Define argument not found: {0}")]
     DefineArgNotFound(String),
+
     #[error("Define not found: {0}")]
     DefineNotFound(String),
+
     #[error("Define must have argument")]
     DefineNoArgs,
+
     #[error("Exceed recursive limit")]
     ExceedRecursiveLimit,
+
     #[error("Include line can't have other items")]
     IncludeLine,
 }

sv-parser-pp/src/preprocess.rs

@@ -226,19 +226,19 @@ pub fn preprocess_str<T: AsRef<Path>, U: AsRef<Path>, V: BuildHasher>(
 
     let span = Span::new_extra(&s, SpanInfo::default());
     let (_, pp_text) = all_consuming(pp_parser)(span).map_err(|x| match x {
-        nom::Err::Incomplete(_) => Error::Parse(None),
+        nom::Err::Incomplete(_) => Error::Preprocess(None),
         nom::Err::Error(e) => {
             if let Some(pos) = error_position(&e) {
-                Error::Parse(Some((PathBuf::from(path.as_ref()), pos)))
+                Error::Preprocess(Some((PathBuf::from(path.as_ref()), pos)))
             } else {
-                Error::Parse(None)
+                Error::Preprocess(None)
             }
         }
         nom::Err::Failure(e) => {
             if let Some(pos) = error_position(&e) {
-                Error::Parse(Some((PathBuf::from(path.as_ref()), pos)))
+                Error::Preprocess(Some((PathBuf::from(path.as_ref()), pos)))
             } else {
-                Error::Parse(None)
+                Error::Preprocess(None)
             }
         }
     })?;