Move parsers for specific objects/elements to their own files.

The parsers are the most complicated part, so I want them in their own files. I am uncertain if I want to move their corresponding structs or just the parsers.

src/parser/element.rs

@@ -1,27 +1,12 @@
-use nom::branch::alt;
-use nom::character::complete::line_ending;
-use nom::character::complete::space0;
-use nom::combinator::eof;
+use crate::parser::parser_with_context::parser_with_context;
 use nom::combinator::map;
 use nom::combinator::not;
-use nom::combinator::recognize;
-use nom::multi::many0;
-use nom::multi::many1;
-use nom::sequence::tuple;
-
-use crate::parser::object::standard_set_object;
-use crate::parser::parser_context::ChainBehavior;
-use crate::parser::parser_context::ContextElement;
-use crate::parser::parser_context::ExitMatcherNode;
-use crate::parser::parser_with_context::parser_with_context;
 
 use super::error::Res;
 use super::greater_element::PlainList;
 use super::lesser_element::Paragraph;
+use super::paragraph::paragraph;
 use super::source::Source;
-use super::util::blank_line;
-use super::util::get_consumed;
-use super::util::trailing_whitespace;
 use super::Context;
 
 #[derive(Debug)]
@@ -46,24 +31,3 @@ pub fn element<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str,
 
     map(paragraph_matcher, Element::Paragraph)(input)
 }
-
-fn paragraph<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Paragraph<'s>> {
-    let parser_context =
-        context.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
-            exit_matcher: ChainBehavior::AndParent(Some(&paragraph_end)),
-        }));
-    let standard_set_object_matcher = parser_with_context!(standard_set_object)(&parser_context);
-
-    let (remaining, children) = many1(standard_set_object_matcher)(input)?;
-
-    let (remaining, _trailing_whitespace) = trailing_whitespace(remaining)?;
-
-    let source = get_consumed(input, remaining);
-
-    Ok((remaining, Paragraph { source, children }))
-}
-
-fn paragraph_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
-    // TODO: Other elements should also end paragraphs
-    alt((recognize(tuple((line_ending, many1(blank_line)))), eof))(input)
-}

src/parser/mod.rs

@@ -6,8 +6,10 @@ mod greater_element;
 mod lesser_element;
 mod list;
 mod object;
+mod paragraph;
 mod parser_context;
 mod parser_with_context;
+mod plain_text;
 mod source;
 mod util;
 pub use document::document;

src/parser/object.rs

@@ -1,11 +1,9 @@
 use nom::combinator::map;
 use nom::combinator::not;
 
-use crate::parser::error::CustomError;
-use crate::parser::error::MyError;
-
 use super::error::Res;
 use super::parser_with_context::parser_with_context;
+use super::plain_text::plain_text;
 use super::source::Source;
 use super::Context;
 
@@ -51,58 +49,3 @@ pub fn standard_set_object<'r, 's>(
 
     map(plain_text_matcher, Object::PlainText)(input)
 }
-
-fn plain_text<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, PlainText<'s>> {
-    if input.len() == 0 {
-        return Err(nom::Err::Error(CustomError::MyError(MyError(
-            "Zero input length to plain_text.",
-        ))));
-    }
-    // not(|i| context.check_exit_matcher(i))(input)?;
-    let mut current_input = input.char_indices();
-    loop {
-        match current_input.next() {
-            Some((offset, _char)) => {
-                let remaining = &input[offset..];
-                let exit_matcher_status = not(|i| context.check_exit_matcher(i))(remaining);
-                if exit_matcher_status.is_err() {
-                    if offset == 0 {
-                        // If we're at the start of the input, then nothing is plain text, so fire an error for zero-length match.
-                        exit_matcher_status?;
-                    } else {
-                        return Ok((
-                            &input[offset..],
-                            PlainText {
-                                source: &input[..offset],
-                            },
-                        ));
-                    }
-                }
-            }
-            None => {
-                // We hit the end of the file, so all input must be plain text
-                return Ok((&input[input.len()..], PlainText { source: input }));
-            }
-        };
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::parser::parser_context::ContextElement;
-    use crate::parser::parser_context::ContextTree;
-
-    use super::*;
-
-    #[test]
-    fn plain_text_simple() {
-        let input = "foobarbaz";
-        let initial_context: ContextTree<'_, '_> = ContextTree::new();
-        let document_context =
-            initial_context.with_additional_node(ContextElement::DocumentRoot(input));
-        let plain_text_matcher = parser_with_context!(plain_text)(&document_context);
-        let (remaining, result) = map(plain_text_matcher, Object::PlainText)(input).unwrap();
-        assert_eq!(remaining, "");
-        assert_eq!(result.get_source(), input);
-    }
-}

src/parser/paragraph.rs

@@ -0,0 +1,40 @@
+use nom::branch::alt;
+use nom::character::complete::line_ending;
+use nom::combinator::eof;
+use nom::combinator::recognize;
+use nom::multi::many1;
+use nom::sequence::tuple;
+
+use crate::parser::object::standard_set_object;
+use crate::parser::parser_context::ChainBehavior;
+use crate::parser::parser_context::ContextElement;
+use crate::parser::parser_context::ExitMatcherNode;
+use crate::parser::parser_with_context::parser_with_context;
+
+use super::error::Res;
+use super::lesser_element::Paragraph;
+use super::util::blank_line;
+use super::util::get_consumed;
+use super::util::trailing_whitespace;
+use super::Context;
+
+pub fn paragraph<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Paragraph<'s>> {
+    let parser_context =
+        context.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
+            exit_matcher: ChainBehavior::AndParent(Some(&paragraph_end)),
+        }));
+    let standard_set_object_matcher = parser_with_context!(standard_set_object)(&parser_context);
+
+    let (remaining, children) = many1(standard_set_object_matcher)(input)?;
+
+    let (remaining, _trailing_whitespace) = trailing_whitespace(remaining)?;
+
+    let source = get_consumed(input, remaining);
+
+    Ok((remaining, Paragraph { source, children }))
+}
+
+fn paragraph_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    // TODO: Other elements should also end paragraphs
+    alt((recognize(tuple((line_ending, many1(blank_line)))), eof))(input)
+}

src/parser/plain_text.rs

@@ -0,0 +1,68 @@
+use nom::combinator::not;
+
+use crate::parser::error::CustomError;
+use crate::parser::error::MyError;
+
+use super::error::Res;
+use super::object::PlainText;
+use super::Context;
+
+pub fn plain_text<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, PlainText<'s>> {
+    if input.len() == 0 {
+        return Err(nom::Err::Error(CustomError::MyError(MyError(
+            "Zero input length to plain_text.",
+        ))));
+    }
+    // not(|i| context.check_exit_matcher(i))(input)?;
+    let mut current_input = input.char_indices();
+    loop {
+        match current_input.next() {
+            Some((offset, _char)) => {
+                let remaining = &input[offset..];
+                let exit_matcher_status = not(|i| context.check_exit_matcher(i))(remaining);
+                if exit_matcher_status.is_err() {
+                    if offset == 0 {
+                        // If we're at the start of the input, then nothing is plain text, so fire an error for zero-length match.
+                        exit_matcher_status?;
+                    } else {
+                        return Ok((
+                            &input[offset..],
+                            PlainText {
+                                source: &input[..offset],
+                            },
+                        ));
+                    }
+                }
+            }
+            None => {
+                // We hit the end of the file, so all input must be plain text
+                return Ok((&input[input.len()..], PlainText { source: input }));
+            }
+        };
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use nom::combinator::map;
+
+    use crate::parser::object::Object;
+    use crate::parser::parser_context::ContextElement;
+    use crate::parser::parser_context::ContextTree;
+    use crate::parser::parser_with_context::parser_with_context;
+    use crate::parser::source::Source;
+
+    use super::*;
+
+    #[test]
+    fn plain_text_simple() {
+        let input = "foobarbaz";
+        let initial_context: ContextTree<'_, '_> = ContextTree::new();
+        let document_context =
+            initial_context.with_additional_node(ContextElement::DocumentRoot(input));
+        let plain_text_matcher = parser_with_context!(plain_text)(&document_context);
+        let (remaining, result) = map(plain_text_matcher, Object::PlainText)(input).unwrap();
+        assert_eq!(remaining, "");
+        assert_eq!(result.get_source(), input);
+    }
+}