use std::borrow::Cow;
// TODO: Add a check for unexpected keys in the properties
use std::collections::BTreeSet;
use std::collections::HashSet;

use super::elisp_fact::ElispFact;
use super::elisp_fact::GetElispFact;
use super::sexp::unquote;
use super::sexp::Token;
use super::util::compare_standard_properties;
use super::util::get_property;
use super::util::get_property_quoted_string;
use super::util::get_property_unquoted_atom;
use crate::types::AngleLink;
use crate::types::BabelCall;
use crate::types::Bold;
use crate::types::CheckboxType;
use crate::types::Citation;
use crate::types::CitationReference;
use crate::types::Clock;
use crate::types::Code;
use crate::types::Comment;
use crate::types::CommentBlock;
use crate::types::DiarySexp;
use crate::types::Document;
use crate::types::DocumentElement;
use crate::types::Drawer;
use crate::types::DynamicBlock;
use crate::types::Element;
use crate::types::Entity;
use crate::types::ExampleBlock;
use crate::types::ExportBlock;
use crate::types::ExportSnippet;
use crate::types::FixedWidthArea;
use crate::types::FootnoteDefinition;
use crate::types::FootnoteReference;
use crate::types::GetStandardProperties;
use crate::types::GreaterBlock;
use crate::types::Heading;
use crate::types::HorizontalRule;
use crate::types::InlineBabelCall;
use crate::types::InlineSourceBlock;
use crate::types::Italic;
use crate::types::Keyword;
use crate::types::LatexEnvironment;
use crate::types::LatexFragment;
use crate::types::LineBreak;
use crate::types::NodeProperty;
use crate::types::Object;
use crate::types::OrgMacro;
use crate::types::Paragraph;
use crate::types::PlainLink;
use crate::types::PlainList;
use crate::types::PlainListItem;
use crate::types::PlainListItemCounter;
use crate::types::PlainListItemPreBlank;
use crate::types::PlainListType;
use crate::types::PlainText;
use crate::types::Planning;
use crate::types::PriorityCookie;
use crate::types::PropertyDrawer;
use crate::types::RadioLink;
use crate::types::RadioTarget;
use crate::types::RegularLink;
use crate::types::Section;
use crate::types::SrcBlock;
use crate::types::StandardProperties;
use crate::types::StatisticsCookie;
use crate::types::StrikeThrough;
use crate::types::Subscript;
use crate::types::Superscript;
use crate::types::Table;
use crate::types::TableCell;
use crate::types::TableRow;
use crate::types::Target;
use crate::types::Timestamp;
use crate::types::TodoKeywordType;
use crate::types::Underline;
use crate::types::Verbatim;
use crate::types::VerseBlock;

#[derive(Debug)]
pub enum DiffEntry<'s> {
    DiffResult(DiffResult<'s>),
    DiffLayer(DiffLayer<'s>),
}

#[derive(Debug)]
pub struct DiffResult<'s> {
    status: DiffStatus,
    name: Cow<'s, str>,
    message: Option<String>,
    children: Vec<DiffEntry<'s>>,
    rust_source: &'s str,
    #[allow(dead_code)]
    emacs_token: &'s Token<'s>,
}

#[derive(Debug, PartialEq)]
enum DiffStatus {
    Good,
    Bad,
}

#[derive(Debug)]
pub struct DiffLayer<'s> {
    name: Cow<'s, str>,
    children: Vec<DiffEntry<'s>>,
}

impl<'s> From<DiffResult<'s>> for DiffEntry<'s> {
    fn from(value: DiffResult<'s>) -> Self {
        DiffEntry::DiffResult(value)
    }
}

impl<'s> From<DiffLayer<'s>> for DiffEntry<'s> {
    fn from(value: DiffLayer<'s>) -> Self {
        DiffEntry::DiffLayer(value)
    }
}

impl<'s> DiffEntry<'s> {
    fn has_bad_children(&self) -> bool {
        match self {
            DiffEntry::DiffResult(diff) => &diff.children,
            DiffEntry::DiffLayer(diff) => &diff.children,
        }
        .iter()
        .any(|child| child.is_immediately_bad() || child.has_bad_children())
    }

    fn is_immediately_bad(&self) -> bool {
        match self {
            DiffEntry::DiffResult(diff) => diff.status == DiffStatus::Bad,
            DiffEntry::DiffLayer(_) => false,
        }
    }

    pub fn is_bad(&self) -> bool {
        self.is_immediately_bad() || self.has_bad_children()
    }

    pub fn print(&self, original_document: &str) -> Result<(), Box<dyn std::error::Error>> {
        self.print_indented(0, original_document)
    }

    fn print_indented(
        &self,
        indentation: usize,
        original_document: &str,
    ) -> Result<(), Box<dyn std::error::Error>> {
        match self {
            DiffEntry::DiffResult(diff) => diff.print_indented(indentation, original_document),
            DiffEntry::DiffLayer(diff) => diff.print_indented(indentation, original_document),
        }
    }
}

impl<'s> DiffResult<'s> {
    fn print_indented(
        &self,
        indentation: usize,
        original_document: &str,
    ) -> Result<(), Box<dyn std::error::Error>> {
        let status_text = {
            match self.status {
                DiffStatus::Good => {
                    if self.has_bad_children() {
                        format!(
                            "{color}BADCHILD{reset}",
                            color = DiffResult::foreground_color(255, 255, 0),
                            reset = DiffResult::reset_color(),
                        )
                    } else {
                        format!(
                            "{color}GOOD{reset}",
                            color = DiffResult::foreground_color(0, 255, 0),
                            reset = DiffResult::reset_color(),
                        )
                    }
                }
                DiffStatus::Bad => format!(
                    "{color}BAD{reset}",
                    color = DiffResult::foreground_color(255, 0, 0),
                    reset = DiffResult::reset_color(),
                ),
            }
        };
        let rust_offset = self.rust_source.as_ptr() as usize - original_document.as_ptr() as usize;
        let preceding_text = &original_document[..rust_offset];
        println!(
            "{indentation}{status_text} {name} char({char_offset}) {message}",
            indentation = "  ".repeat(indentation),
            status_text = status_text,
            name = self.name,
            char_offset = preceding_text.chars().count() + 1,
            message = self.message.as_ref().map(|m| m.as_str()).unwrap_or("")
        );
        for child in self.children.iter() {
            child.print_indented(indentation + 1, original_document)?;
        }
        Ok(())
    }

    fn has_bad_children(&self) -> bool {
        self.children
            .iter()
            .any(|child| child.is_immediately_bad() || child.has_bad_children())
    }

    fn foreground_color(red: u8, green: u8, blue: u8) -> String {
        if DiffResult::should_use_color() {
            format!(
                "\x1b[38;2;{red};{green};{blue}m",
                red = red,
                green = green,
                blue = blue
            )
        } else {
            String::new()
        }
    }

    #[allow(dead_code)]
    fn background_color(red: u8, green: u8, blue: u8) -> String {
        if DiffResult::should_use_color() {
            format!(
                "\x1b[48;2;{red};{green};{blue}m",
                red = red,
                green = green,
                blue = blue
            )
        } else {
            String::new()
        }
    }

    fn reset_color() -> &'static str {
        if DiffResult::should_use_color() {
            "\x1b[0m"
        } else {
            ""
        }
    }

    fn should_use_color() -> bool {
        !std::env::var("NO_COLOR").is_ok_and(|val| !val.is_empty())
    }
}

impl<'s> DiffLayer<'s> {
    fn has_bad_children(&self) -> bool {
        self.children
            .iter()
            .any(|child| child.is_immediately_bad() || child.has_bad_children())
    }

    fn print_indented(
        &self,
        indentation: usize,
        original_document: &str,
    ) -> Result<(), Box<dyn std::error::Error>> {
        let status_text = if self.has_bad_children() {
            format!(
                "{color}BADCHILD{reset}",
                color = DiffResult::foreground_color(255, 255, 0),
                reset = DiffResult::reset_color(),
            )
        } else {
            format!(
                "{color}GOOD{reset}",
                color = DiffResult::foreground_color(0, 255, 0),
                reset = DiffResult::reset_color(),
            )
        };
        println!(
            "{indentation}{status_text} {name}",
            indentation = "  ".repeat(indentation),
            status_text = status_text,
            name = self.name,
        );
        for child in self.children.iter() {
            child.print_indented(indentation + 1, original_document)?;
        }
        Ok(())
    }
}

fn artificial_diff_scope<'s>(
    name: &'static str,
    children: Vec<DiffEntry<'s>>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    Ok(DiffLayer {
        name: name.into(),
        children,
    }
    .into())
}

fn compare_element<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Element<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let compare_result = match rust {
        Element::Paragraph(obj) => compare_paragraph(source, emacs, obj),
        Element::PlainList(obj) => compare_plain_list(source, emacs, obj),
        Element::GreaterBlock(obj) => compare_greater_block(source, emacs, obj),
        Element::DynamicBlock(obj) => compare_dynamic_block(source, emacs, obj),
        Element::FootnoteDefinition(obj) => compare_footnote_definition(source, emacs, obj),
        Element::Comment(obj) => compare_comment(source, emacs, obj),
        Element::Drawer(obj) => compare_drawer(source, emacs, obj),
        Element::PropertyDrawer(obj) => compare_property_drawer(source, emacs, obj),
        Element::Table(obj) => compare_table(source, emacs, obj),
        Element::VerseBlock(obj) => compare_verse_block(source, emacs, obj),
        Element::CommentBlock(obj) => compare_comment_block(source, emacs, obj),
        Element::ExampleBlock(obj) => compare_example_block(source, emacs, obj),
        Element::ExportBlock(obj) => compare_export_block(source, emacs, obj),
        Element::SrcBlock(obj) => compare_src_block(source, emacs, obj),
        Element::Clock(obj) => compare_clock(source, emacs, obj),
        Element::DiarySexp(obj) => compare_diary_sexp(source, emacs, obj),
        Element::Planning(obj) => compare_planning(source, emacs, obj),
        Element::FixedWidthArea(obj) => compare_fixed_width_area(source, emacs, obj),
        Element::HorizontalRule(obj) => compare_horizontal_rule(source, emacs, obj),
        Element::Keyword(obj) => compare_keyword(source, emacs, obj),
        Element::BabelCall(obj) => compare_babel_call(source, emacs, obj),
        Element::LatexEnvironment(obj) => compare_latex_environment(source, emacs, obj),
    };

    let mut compare_result = match compare_result.unwrap_or_else(|e| {
        DiffResult {
            status: DiffStatus::Bad,
            name: "error!".into(),
            message: Some(e.to_string()),
            children: Vec::new(),
            rust_source: rust.get_standard_properties().get_source(),
            emacs_token: emacs,
        }
        .into()
    }) {
        DiffEntry::DiffResult(inner) => inner,
        DiffEntry::DiffLayer(_) => {
            unreachable!("Layers are only interior to DiffResults of AST nodes.")
        }
    };

    match compare_standard_properties(source, emacs, rust) {
        Err(err) => {
            compare_result.status = DiffStatus::Bad;
            compare_result.message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    Ok(compare_result.into())
}

fn compare_object<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Object<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let compare_result = match rust {
        Object::Bold(obj) => compare_bold(source, emacs, obj),
        Object::Italic(obj) => compare_italic(source, emacs, obj),
        Object::Underline(obj) => compare_underline(source, emacs, obj),
        Object::Verbatim(obj) => compare_verbatim(source, emacs, obj),
        Object::Code(obj) => compare_code(source, emacs, obj),
        Object::StrikeThrough(obj) => compare_strike_through(source, emacs, obj),
        Object::PlainText(obj) => compare_plain_text(source, emacs, obj),
        Object::RegularLink(obj) => compare_regular_link(source, emacs, obj),
        Object::RadioLink(obj) => compare_radio_link(source, emacs, obj),
        Object::RadioTarget(obj) => compare_radio_target(source, emacs, obj),
        Object::PlainLink(obj) => compare_plain_link(source, emacs, obj),
        Object::AngleLink(obj) => compare_angle_link(source, emacs, obj),
        Object::OrgMacro(obj) => compare_org_macro(source, emacs, obj),
        Object::Entity(obj) => compare_entity(source, emacs, obj),
        Object::LatexFragment(obj) => compare_latex_fragment(source, emacs, obj),
        Object::ExportSnippet(obj) => compare_export_snippet(source, emacs, obj),
        Object::FootnoteReference(obj) => compare_footnote_reference(source, emacs, obj),
        Object::Citation(obj) => compare_citation(source, emacs, obj),
        Object::CitationReference(obj) => compare_citation_reference(source, emacs, obj),
        Object::InlineBabelCall(obj) => compare_inline_babel_call(source, emacs, obj),
        Object::InlineSourceBlock(obj) => compare_inline_source_block(source, emacs, obj),
        Object::LineBreak(obj) => compare_line_break(source, emacs, obj),
        Object::Target(obj) => compare_target(source, emacs, obj),
        Object::StatisticsCookie(obj) => compare_statistics_cookie(source, emacs, obj),
        Object::Subscript(obj) => compare_subscript(source, emacs, obj),
        Object::Superscript(obj) => compare_superscript(source, emacs, obj),
        Object::Timestamp(obj) => compare_timestamp(source, emacs, obj),
    };
    let mut compare_result = match compare_result.unwrap_or_else(|e| {
        DiffResult {
            status: DiffStatus::Bad,
            name: rust.get_elisp_fact().get_elisp_name(),
            message: Some(e.to_string()),
            children: Vec::new(),
            rust_source: rust.get_standard_properties().get_source(),
            emacs_token: emacs,
        }
        .into()
    }) {
        DiffEntry::DiffResult(inner) => inner,
        DiffEntry::DiffLayer(_) => {
            unreachable!("Layers are only interior to DiffResults of AST nodes.")
        }
    };

    // PlainText is a special case because upstream Org-Mode uses relative values for the bounds in plaintext rather than absolute so the below checks do not account for that.
    if let Object::PlainText(_) = rust {
    } else {
        match compare_standard_properties(source, emacs, rust) {
            Err(err) => {
                compare_result.status = DiffStatus::Bad;
                compare_result.message = Some(err.to_string())
            }
            Ok(_) => {}
        }
    }

    Ok(compare_result.into())
}

pub fn compare_document<'s>(
    emacs: &'s Token<'s>,
    rust: &'s Document<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;
    match compare_standard_properties(rust.source, emacs, rust) {
        Err(err) => {
            this_status = DiffStatus::Bad;
            message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    // Compare :path
    // :path is a quoted string to the absolute path of the document.
    let document_path = get_property_quoted_string(emacs, ":path")?;
    let rust_document_path = rust.path.as_ref().map(|p| p.to_str()).flatten();
    match (
        document_path.as_ref().map(|s| s.as_str()),
        rust_document_path,
    ) {
        (None, None) => {}
        (None, Some(_)) | (Some(_), None) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Path mismatch (emacs != rust) {:?} != {:?}",
                document_path, rust_document_path
            ));
        }
        (Some(e), Some(r)) if e != r => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Path mismatch (emacs != rust) {:?} != {:?}",
                document_path, rust_document_path
            ));
        }
        (Some(_), Some(_)) => {}
    };

    // Compare category
    // :CATEGORY is specified either from "#+CATEGORY:" or it is the file name without the ".org" extension.
    let category = get_property_quoted_string(emacs, ":CATEGORY")?;
    match (category.as_ref(), rust.category.as_ref()) {
        (None, None) => {}
        (None, Some(_)) | (Some(_), None) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Category mismatch (emacs != rust) {:?} != {:?}",
                category, rust.category
            ));
        }
        (Some(e), Some(r)) if e != r => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Category mismatch (emacs != rust) {:?} != {:?}",
                category, rust.category
            ));
        }
        (Some(_), Some(_)) => {}
    };

    // Skipping "org-data" and its properties
    for (i, token) in children.iter().skip(2).enumerate() {
        let section_or_headline = token.as_list()?;
        let first_cell = section_or_headline
            .first()
            .ok_or("Should have at least one child.")?
            .as_atom()?;
        if first_cell == "section" {
            if i != 0 {
                return Err("Section cannot be after the first child of document.".into());
            }
            child_status.push(compare_section(
                rust.source,
                token,
                rust.zeroth_section
                    .as_ref()
                    .ok_or("No corresponding zeroth-section")?,
            )?);
        } else if first_cell == "headline" {
            let corresponding_heading = rust
                .children
                .iter()
                .nth(i - rust.zeroth_section.as_ref().map(|_| 1).unwrap_or(0))
                .ok_or("Should have a corresponding heading.")?;
            child_status.push(compare_heading(rust.source, token, corresponding_heading)?);
        } else {
            return Err(format!(
                "Document should only contain sections and headlines, found: {}",
                first_cell
            )
            .into());
        }
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_section<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Section<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut this_status = DiffStatus::Good;
    let mut child_status = Vec::new();
    let mut message = None;

    match compare_standard_properties(source, emacs, rust) {
        Err(err) => {
            this_status = DiffStatus::Bad;
            message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_element(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_heading<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Heading<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;

    match compare_standard_properties(source, emacs, rust) {
        Err(err) => {
            this_status = DiffStatus::Bad;
            message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    // Compare level
    let level = get_property(emacs, ":level")?
        .ok_or("Level should not be nil")?
        .as_atom()?;
    if rust.level.to_string() != level {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "Headline level do not match (emacs != rust): {} != {}",
            level, rust.level
        ))
    }

    // Compare tags
    let emacs_tags = get_tags_from_heading(emacs)?;
    let emacs_tags: HashSet<_> = emacs_tags.iter().map(|val| val.as_str()).collect();
    let rust_tags: HashSet<&str> = rust.tags.iter().map(|val| *val).collect();
    let difference: Vec<&str> = emacs_tags
        .symmetric_difference(&rust_tags)
        .map(|val| *val)
        .collect();
    if !difference.is_empty() {
        this_status = DiffStatus::Bad;
        message = Some(format!("Mismatched tags: {}", difference.join(", ")));
    }

    // Compare todo-keyword
    let todo_keyword = get_property(emacs, ":todo-keyword")?
        .map(Token::as_atom)
        .map_or(Ok(None), |r| r.map(Some))?
        .unwrap_or("nil");
    match (todo_keyword, &rust.todo_keyword, unquote(todo_keyword)) {
        ("nil", None, _) => {}
        (_, Some((_rust_todo_type, rust_todo)), Ok(emacs_todo)) if emacs_todo == *rust_todo => {}
        (emacs_todo, rust_todo, _) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "(emacs != rust) {:?} != {:?}",
                emacs_todo, rust_todo
            ));
        }
    };
    // Compare todo-type
    let todo_type = get_property(emacs, ":todo-type")?
        .map(Token::as_atom)
        .map_or(Ok(None), |r| r.map(Some))?
        .unwrap_or("nil");
    // todo-type is an unquoted string either todo, done, or nil
    match (todo_type, &rust.todo_keyword) {
        ("nil", None) => {}
        ("todo", Some((TodoKeywordType::Todo, _))) => {}
        ("done", Some((TodoKeywordType::Done, _))) => {}
        (emacs_todo, rust_todo) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "(emacs != rust) {:?} != {:?}",
                emacs_todo, rust_todo
            ));
        }
    };

    // Compare title
    let title = get_property(emacs, ":title")?;
    match (title, rust.title.len()) {
        (None, 0) => {}
        (None, _) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Titles do not match (emacs != rust): {:?} != {:?}",
                title, rust.title
            ))
        }
        (Some(title), _) => {
            let title_status = title
                .as_list()?
                .iter()
                .zip(rust.title.iter())
                .map(|(emacs_child, rust_child)| compare_object(source, emacs_child, rust_child))
                .collect::<Result<Vec<_>, _>>()?;
            child_status.push(artificial_diff_scope("title", title_status)?);
        }
    };

    // Compare priority
    let priority = get_property(emacs, ":priority")?;
    match (priority, rust.priority_cookie) {
        (None, None) => {}
        (None, Some(_)) | (Some(_), None) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Priority cookie mismatch (emacs != rust) {:?} != {:?}",
                priority, rust.priority_cookie
            ));
        }
        (Some(emacs_priority_cookie), Some(rust_priority_cookie)) => {
            let emacs_priority_cookie =
                emacs_priority_cookie.as_atom()?.parse::<PriorityCookie>()?;
            if emacs_priority_cookie != rust_priority_cookie {
                this_status = DiffStatus::Bad;
                message = Some(format!(
                    "Priority cookie mismatch (emacs != rust) {:?} != {:?}",
                    emacs_priority_cookie, rust_priority_cookie
                ));
            }
        }
    }

    // Compare archived
    let archived = get_property(emacs, ":archivedp")?;
    match (archived, rust.is_archived) {
        (None, true) | (Some(_), false) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "archived mismatch (emacs != rust) {:?} != {:?}",
                archived, rust.is_archived
            ));
        }
        (None, false) | (Some(_), true) => {}
    }

    // Compare commented
    let commented = get_property(emacs, ":commentedp")?;
    match (commented, rust.is_comment) {
        (None, true) | (Some(_), false) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "commented mismatch (emacs != rust) {:?} != {:?}",
                commented, rust.is_comment
            ));
        }
        (None, false) | (Some(_), true) => {}
    }

    // TODO: Compare :pre-blank :raw-value :footnote-section-p :scheduled :closed
    //
    // :scheduled and :closed seem to only appear when the headline has a planning

    // Compare section
    let section_status = children
        .iter()
        .skip(2)
        .zip(rust.children.iter())
        .map(|(emacs_child, rust_child)| match rust_child {
            DocumentElement::Heading(rust_heading) => {
                compare_heading(source, emacs_child, rust_heading)
            }
            DocumentElement::Section(rust_section) => {
                compare_section(source, emacs_child, rust_section)
            }
        })
        .collect::<Result<Vec<_>, _>>()?;
    child_status.push(artificial_diff_scope("section", section_status)?);

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn get_tags_from_heading<'s>(
    emacs: &'s Token<'s>,
) -> Result<HashSet<String>, Box<dyn std::error::Error>> {
    let tags = match get_property(emacs, ":tags")? {
        Some(prop) => prop,
        None => return Ok(HashSet::new()),
    };

    match tags.as_atom() {
        Ok(val) => panic!("Unexpected value for tags: {:?}", val),
        Err(_) => {}
    };
    let tags = {
        let tags = tags.as_list()?;
        let strings = tags
            .iter()
            .map(Token::as_atom)
            .collect::<Result<Vec<&str>, _>>()?;
        strings
            .into_iter()
            .map(unquote)
            .collect::<Result<HashSet<String>, _>>()?
    };
    Ok(tags)
}

fn compare_paragraph<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Paragraph<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_object(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_plain_list<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s PlainList<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;

    // Compare type
    // :type is an unquoted atom of either descriptive, ordered, or unordered
    let list_type = get_property_unquoted_atom(emacs, ":type")?;
    match (list_type, &rust.list_type) {
        (None, _) => panic!("Emacs returned a list with no type."),
        (Some("unordered"), PlainListType::Unordered) => {}
        (Some("ordered"), PlainListType::Ordered) => {}
        (Some("descriptive"), PlainListType::Descriptive) => {}
        _ => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "List type mismatch (emacs != rust) {:?} != {:?}",
                list_type, rust.list_type
            ));
        }
    }

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_plain_list_item(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_plain_list_item<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s PlainListItem<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;
    // This is not called from compare_element so we have to duplicate all the common checks here.
    match compare_standard_properties(source, emacs, rust) {
        Err(err) => {
            this_status = DiffStatus::Bad;
            message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    // Compare tag
    let tag = get_property(emacs, ":tag")?;
    match (tag, rust.tag.is_empty()) {
        (None, true) => {}
        (None, false) | (Some(_), true) => {
            this_status = DiffStatus::Bad;
            message = Some("Mismatched tags".to_owned());
        }
        (Some(tag), false) => {
            let tag_status = tag
                .as_list()?
                .iter()
                .zip(rust.tag.iter())
                .map(|(emacs_child, rust_child)| compare_object(source, emacs_child, rust_child))
                .collect::<Result<Vec<_>, _>>()?;
            child_status.push(artificial_diff_scope("tag", tag_status)?);
        }
    };

    // Compare contents
    let contents_status = children
        .iter()
        .skip(2)
        .zip(rust.children.iter())
        .map(|(emacs_child, rust_child)| compare_element(source, emacs_child, rust_child))
        .collect::<Result<Vec<_>, _>>()?;
    child_status.push(artificial_diff_scope("contents", contents_status)?);

    // Compare bullet
    let bullet = get_property_quoted_string(emacs, ":bullet")?
        .ok_or("Plain list items must have a :bullet.")?;
    if bullet != rust.bullet {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "Bullet mismatch (emacs != rust) {:?} != {:?}",
            bullet, rust.bullet
        ));
    }

    // Compare counter
    let counter = get_property_unquoted_atom(emacs, ":counter")?;
    let counter: Option<PlainListItemCounter> = counter
        .map(|val| val.parse())
        .map_or(Ok(None), |r| r.map(Some))?;
    match (counter, rust.counter) {
        (None, None) => {}
        (None, Some(_)) | (Some(_), None) => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Counter mismatch (emacs != rust) {:?} != {:?}",
                counter, rust.counter
            ));
        }
        (Some(e), Some(r)) if e != r => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Counter mismatch (emacs != rust) {:?} != {:?}",
                counter, rust.counter
            ));
        }
        (Some(_), Some(_)) => {}
    };

    // Compare checkbox
    let checkbox = get_property(emacs, ":checkbox")?
        .map(Token::as_atom)
        .map_or(Ok(None), |r| r.map(Some))?
        .unwrap_or("nil");
    match (checkbox, &rust.checkbox) {
        ("nil", None) => {}
        ("off", Some((CheckboxType::Off, _))) => {}
        ("trans", Some((CheckboxType::Trans, _))) => {}
        ("on", Some((CheckboxType::On, _))) => {}
        _ => {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Checkbox mismatch (emacs != rust) {:?} != {:?}",
                checkbox, rust.checkbox
            ));
        }
    };

    // Compare pre-blank
    // :pre-blank appears to count the line breaks between "::" and the contents in a descriptive list. Oddly enough it does not count the spaces so I'm not quite sure what the value is.
    let pre_blank = get_property_unquoted_atom(emacs, ":pre-blank")?;
    let pre_blank: Option<PlainListItemPreBlank> = pre_blank
        .map(|val| val.parse())
        .map_or(Ok(None), |r| r.map(Some))?;
    if pre_blank.unwrap_or(0) != rust.pre_blank {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "Pre-blank mismatch (emacs != rust) {:?} != {:?}",
            pre_blank, rust.pre_blank
        ));
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_greater_block<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s GreaterBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;
    // TODO: Special block compare :type :parameters
    // Center and quote block has no additional properties

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_element(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_dynamic_block<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s DynamicBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;
    // TODO: Compare :block-name :arguments

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_element(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_footnote_definition<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s FootnoteDefinition<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;
    // TODO: Compare :label :pre-blank

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_element(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_comment<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Comment<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;
    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_drawer<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Drawer<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;
    // TODO: Compare :drawer-name

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_element(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_property_drawer<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s PropertyDrawer<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_node_property(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_node_property<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s NodeProperty<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;
    // This is not called from compare_element so we must duplicate all the tests here.
    match compare_standard_properties(source, emacs, rust) {
        Err(err) => {
            this_status = DiffStatus::Bad;
            message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    // TODO: Compare :key :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_table<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Table<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;

    // Compare formulas
    //
    // :tblfm is either nil or a list () filled with quoted strings containing the value for any tblfm keywords at the end of the table.
    let emacs_formulas = get_property(emacs, ":tblfm")?;
    if let Some(emacs_formulas) = emacs_formulas {
        let emacs_formulas = emacs_formulas.as_list()?;
        if emacs_formulas.len() != rust.formulas.len() {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Formulas do not match (emacs != rust): {:?} != {:?}",
                emacs_formulas, rust.formulas
            ))
        } else {
            let atoms = emacs_formulas
                .into_iter()
                .map(Token::as_atom)
                .collect::<Result<Vec<_>, _>>()?;
            let unquoted = atoms
                .into_iter()
                .map(unquote)
                .collect::<Result<BTreeSet<_>, _>>()?;
            for kw in &rust.formulas {
                if !unquoted.contains(kw.value) {
                    this_status = DiffStatus::Bad;
                    message = Some(format!("Could not find formula in emacs: {}", kw.value))
                }
            }
        }
    } else {
        if !rust.formulas.is_empty() {
            this_status = DiffStatus::Bad;
            message = Some(format!(
                "Formulas do not match (emacs != rust): {:?} != {:?}",
                emacs_formulas, rust.formulas
            ))
        }
    }

    // TODO: Compare :type :value

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_table_row(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_table_row<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s TableRow<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let mut child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;
    // This is not called from compare_element so we must duplicate all the tests here.
    match compare_standard_properties(source, emacs, rust) {
        Err(err) => {
            this_status = DiffStatus::Bad;
            message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    // TODO: Compare :type
    //
    // :type is an unquoted atom of either standard or rule

    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
        child_status.push(compare_table_cell(source, emacs_child, rust_child)?);
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_table_cell<'s>(
    source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s TableCell<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;
    // This is not called from compare_object so we must duplicate all the tests here.
    match compare_standard_properties(source, emacs, rust) {
        Err(err) => {
            this_status = DiffStatus::Bad;
            message = Some(err.to_string())
        }
        Ok(_) => {}
    }

    for (_emacs_child, _rust_child) in children.iter().skip(2).zip(rust.children.iter()) {}

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_verse_block<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s VerseBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let children = emacs.as_list()?;
    let child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;

    for (_emacs_child, _rust_child) in children.iter().skip(2).zip(rust.children.iter()) {}

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_comment_block<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s CommentBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_example_block<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s ExampleBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value :switches :number-lines :preserve-indent :retain-labels :use-labels :label-fmt

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_export_block<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s ExportBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :type :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_src_block<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s SrcBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :language :switches :parameters :number-lines :preserve-indent :retain-labels :use-labels :label-fmt :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_clock<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Clock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :status :value :duration

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_diary_sexp<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s DiarySexp<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_planning<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Planning<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :closed :deadline :scheduled

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_fixed_width_area<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s FixedWidthArea<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_horizontal_rule<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s HorizontalRule<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_keyword<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Keyword<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;

    let key = unquote(
        get_property(emacs, ":key")?
            .ok_or("Emacs keywords should have a :key")?
            .as_atom()?,
    )?;
    if key != rust.key.to_uppercase() {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "Mismatchs keyword keys (emacs != rust) {:?} != {:?}",
            key, rust.key
        ))
    }
    let value = unquote(
        get_property(emacs, ":value")?
            .ok_or("Emacs keywords should have a :value")?
            .as_atom()?,
    )?;
    if value != rust.value {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "Mismatchs keyword values (emacs != rust) {:?} != {:?}",
            value, rust.value
        ))
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_babel_call<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s BabelCall<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let child_status = Vec::new();
    let mut this_status = DiffStatus::Good;
    let mut message = None;

    // TODO: Compare :call :inside-header :arguments :end-header
    let value = unquote(
        get_property(emacs, ":value")?
            .ok_or("Emacs keywords should have a :value")?
            .as_atom()?,
    )?;
    if value != rust.value {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "Mismatchs keyword values (emacs != rust) {:?} != {:?}",
            value, rust.value
        ))
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_latex_environment<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s LatexEnvironment<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let child_status = Vec::new();
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: child_status,
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_plain_text<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s PlainText<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let mut this_status = DiffStatus::Good;
    let mut message = None;
    let rust_source = rust.get_source();
    let text = emacs.as_text()?;
    let start_ind: usize = text
        .properties
        .get(0)
        .expect("Should have start index.")
        .as_atom()?
        .parse()?;
    let end_ind: usize = text
        .properties
        .get(1)
        .expect("Should have end index.")
        .as_atom()?
        .parse()?;
    let emacs_text_length = end_ind - start_ind;
    if rust_source.chars().count() != emacs_text_length {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "(emacs len != rust len) {:?} != {:?}",
            emacs_text_length,
            rust_source.len()
        ));
    }
    let unquoted_text = unquote(text.text)?;
    if unquoted_text != rust_source {
        this_status = DiffStatus::Bad;
        message = Some(format!(
            "(emacs != rust) {:?} != {:?}",
            unquoted_text, rust_source
        ));
    }

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source,
        emacs_token: emacs,
    }
    .into())
}

fn compare_bold<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Bold<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_italic<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Italic<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_underline<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Underline<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_verbatim<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Verbatim<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_code<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Code<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_strike_through<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s StrikeThrough<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_regular_link<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s RegularLink<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :type :path :format :raw-link :application :search-option

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_radio_link<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s RadioLink<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :type :path :format :raw-link :application :search-option

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_radio_target<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s RadioTarget<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_plain_link<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s PlainLink<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :type :path :format :raw-link :application :search-option

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_angle_link<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s AngleLink<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :type :path :format :raw-link :application :search-option

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_org_macro<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s OrgMacro<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :key :value :args

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_entity<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Entity<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :name :latex :latex-math-p :html :ascii :latin1 :utf-8 :use-brackets-p

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_latex_fragment<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s LatexFragment<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_export_snippet<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s ExportSnippet<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :back-end :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_footnote_reference<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s FootnoteReference<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :label :type

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_citation<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Citation<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :style :prefix :suffix

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_citation_reference<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s CitationReference<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :key :prefix :suffix

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_inline_babel_call<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s InlineBabelCall<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :call :inside-header :arguments :end-header :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_inline_source_block<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s InlineSourceBlock<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :language :value :parameters

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_line_break<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s LineBreak<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_target<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Target<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_statistics_cookie<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s StatisticsCookie<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :value

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_subscript<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Subscript<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :use-brackets-p

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_superscript<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Superscript<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :use-brackets-p

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}

fn compare_timestamp<'s>(
    _source: &'s str,
    emacs: &'s Token<'s>,
    rust: &'s Timestamp<'s>,
) -> Result<DiffEntry<'s>, Box<dyn std::error::Error>> {
    let this_status = DiffStatus::Good;
    let message = None;

    // TODO: Compare :type :range-type :raw-value :year-start :month-start :day-start :hour-start :minute-start :year-end :month-end :day-end :hour-end :minute-end

    Ok(DiffResult {
        status: this_status,
        name: rust.get_elisp_name(),
        message,
        children: Vec::new(),
        rust_source: rust.get_source(),
        emacs_token: emacs,
    }
    .into())
}