Move MaybeItem into tokenize.rs

tor-netdoc/src/parse.rs

@@ -12,7 +12,6 @@
 use crate::rules::*;
 use crate::tokenize::*;
 use crate::{Error, Position, Result};
-use std::str::FromStr;
 
 /// Describe the rules for one section of a document.
 ///
@@ -121,7 +120,7 @@ impl<'a, T: Keyword> Section<'a, T> {
     /// A MaybeItem is used to represent an object that might or might
     /// not be there.
     pub fn maybe<'b>(&'b self, t: T) -> MaybeItem<'b, 'a> {
-        MaybeItem(self.get(t))
+        MaybeItem::from_option(self.get(t))
     }
     /// Parsing implementation: try to insert an `item`.
     ///
@@ -287,40 +286,3 @@ impl<T: Keyword> SectionRules<T> {
         Ok(section)
     }
 }
-
-/// Represents an Item that might not be present, whose arguments we
-/// want to inspect.  If the Item is there, this acts like a proxy to the
-/// item; otherwise, it treats the item as having no arguments.
-
-pub struct MaybeItem<'a, 'b>(Option<&'a Item<'b>>);
-
-// All methods here are as for Item.
-impl<'a, 'b> MaybeItem<'a, 'b> {
-    pub fn parse_arg<V: FromStr>(&self, idx: usize) -> Result<Option<V>>
-    where
-        <V as FromStr>::Err: std::error::Error,
-    {
-        match self.0 {
-            Some(item) => item.parse_arg(idx).map(Some),
-            None => Ok(None), // XXXX is this correct?
-        }
-    }
-    pub fn parse_optional_arg<V: FromStr>(&self, idx: usize) -> Result<Option<V>>
-    where
-        <V as FromStr>::Err: std::error::Error,
-    {
-        match self.0 {
-            Some(item) => item.parse_optional_arg(idx),
-            None => Ok(None),
-        }
-    }
-    pub fn args_as_str(&self) -> Option<&str> {
-        self.0.map(|item| item.args_as_str())
-    }
-    pub fn get_obj(&self, want_tag: &str) -> Result<Option<Vec<u8>>> {
-        match self.0 {
-            Some(item) => Ok(Some(item.get_obj(want_tag)?)),
-            None => Ok(None),
-        }
-    }
-}

tor-netdoc/src/tokenize.rs

@@ -336,3 +336,43 @@ impl<'a> Item<'a> {
         Position::from_offset(s, self.off)
     }
 }
+
+/// Represents an Item that might not be present, whose arguments we
+/// want to inspect.  If the Item is there, this acts like a proxy to the
+/// item; otherwise, it treats the item as having no arguments.
+
+pub struct MaybeItem<'a, 'b>(Option<&'a Item<'b>>);
+
+// All methods here are as for Item.
+impl<'a, 'b> MaybeItem<'a, 'b> {
+    pub fn from_option(opt: Option<&'a Item<'b>>) -> Self {
+        MaybeItem(opt)
+    }
+    pub fn parse_arg<V: FromStr>(&self, idx: usize) -> Result<Option<V>>
+    where
+        <V as FromStr>::Err: std::error::Error,
+    {
+        match self.0 {
+            Some(item) => item.parse_arg(idx).map(Some),
+            None => Ok(None), // XXXX is this correct?
+        }
+    }
+    pub fn parse_optional_arg<V: FromStr>(&self, idx: usize) -> Result<Option<V>>
+    where
+        <V as FromStr>::Err: std::error::Error,
+    {
+        match self.0 {
+            Some(item) => item.parse_optional_arg(idx),
+            None => Ok(None),
+        }
+    }
+    pub fn args_as_str(&self) -> Option<&str> {
+        self.0.map(|item| item.args_as_str())
+    }
+    pub fn get_obj(&self, want_tag: &str) -> Result<Option<Vec<u8>>> {
+        match self.0 {
+            Some(item) => Ok(Some(item.get_obj(want_tag)?)),
+            None => Ok(None),
+        }
+    }
+}