Refactor navigation helpers (#465)
* Refactor navigation helpers * Target::find: take previous_item by reference This makes more sense for find as an interface, though it causes a second clone in some cases. Maybe rustc is smart here? * Test next and previous navigation helpers * Add more next/previous tests
This commit is contained in:
Jacob Wahlgren
Michael Bryan
parent
d56ff94ce6
commit
3d5eb48e32
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@ -5,165 +5,230 @@ use serde_json;
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use handlebars::{Context, Handlebars, Helper, RenderContext, RenderError, Renderable};
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// Handlebars helper for navigation
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type StringMap = BTreeMap<String, String>;
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pub fn previous(_h: &Helper, r: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
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debug!("[fn]: previous (handlebars helper)");
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debug!("[*]: Get data from context");
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let chapters = rc.evaluate_absolute("chapters").and_then(|c| {
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serde_json::value::from_value::<Vec<BTreeMap<String, String>>>(c.clone())
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.map_err(|_| RenderError::new("Could not decode the JSON data"))
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})?;
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let current = rc.evaluate_absolute("path")?
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.as_str()
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.ok_or_else(|| RenderError::new("Type error for `path`, string expected"))?
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.replace("\"", "");
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let mut previous: Option<BTreeMap<String, String>> = None;
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debug!("[*]: Search for current Chapter");
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// Search for current chapter and return previous entry
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for item in chapters {
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match item.get("path") {
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Some(path) if !path.is_empty() => {
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if path == ¤t {
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debug!("[*]: Found current chapter");
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if let Some(previous) = previous {
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debug!("[*]: Creating BTreeMap to inject in context");
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// Create new BTreeMap to extend the context: 'title' and 'link'
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let mut previous_chapter = BTreeMap::new();
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// Chapter title
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previous.get("name")
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.ok_or_else(|| {
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RenderError::new("No title found for chapter in \
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JSON data")
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})
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.and_then(|n| {
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previous_chapter.insert("title".to_owned(), json!(n));
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Ok(())
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})?;
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// Chapter link
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previous.get("path")
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.ok_or_else(|| {
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RenderError::new("No path found for chapter in \
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JSON data")
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})
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.and_then(|p| {
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Path::new(p).with_extension("html")
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.to_str()
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.ok_or_else(|| {
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RenderError::new("Link could not be \
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converted to str")
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})
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.and_then(|p| {
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previous_chapter
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.insert("link".to_owned(), json!(p.replace("\\", "/")));
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Ok(())
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})
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})?;
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debug!("[*]: Render template");
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// Render template
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_h.template()
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.ok_or_else(|| RenderError::new("Error with the handlebars template"))
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.and_then(|t| {
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let mut local_rc = rc.with_context(Context::wraps(&previous_chapter)?);
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t.render(r, &mut local_rc)
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})?;
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}
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break;
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} else {
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previous = Some(item.clone());
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}
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}
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_ => continue,
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}
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}
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Ok(())
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/// Target for `find_chapter`.
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enum Target {
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Previous,
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Next,
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}
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impl Target {
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/// Returns target if found.
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fn find(&self,
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base_path: &String,
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current_path: &String,
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current_item: &StringMap,
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previous_item: &StringMap,
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) -> Result<Option<StringMap>, RenderError> {
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match self {
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&Target::Next => {
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let previous_path = previous_item.get("path").ok_or_else(|| {
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RenderError::new("No path found for chapter in JSON data")
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})?;
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if previous_path == base_path {
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return Ok(Some(current_item.clone()));
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}
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},
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&Target::Previous => {
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if current_path == base_path {
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return Ok(Some(previous_item.clone()));
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}
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}
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}
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pub fn next(_h: &Helper, r: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
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debug!("[fn]: next (handlebars helper)");
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Ok(None)
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}
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}
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fn find_chapter(
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rc: &mut RenderContext,
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target: Target
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) -> Result<Option<StringMap>, RenderError> {
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debug!("[*]: Get data from context");
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let chapters = rc.evaluate_absolute("chapters").and_then(|c| {
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serde_json::value::from_value::<Vec<BTreeMap<String, String>>>(c.clone())
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serde_json::value::from_value::<Vec<StringMap>>(c.clone())
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.map_err(|_| RenderError::new("Could not decode the JSON data"))
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})?;
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let current = rc.evaluate_absolute("path")?
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.as_str()
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.ok_or_else(|| RenderError::new("Type error for `path`, string expected"))?
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.replace("\"", "");
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let mut previous: Option<BTreeMap<String, String>> = None;
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let base_path = rc.evaluate_absolute("path")?
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.as_str()
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.ok_or_else(|| RenderError::new("Type error for `path`, string expected"))?
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.replace("\"", "");
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let mut previous: Option<StringMap> = None;
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debug!("[*]: Search for chapter");
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debug!("[*]: Search for current Chapter");
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// Search for current chapter and return previous entry
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for item in chapters {
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match item.get("path") {
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Some(path) if !path.is_empty() => {
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if let Some(previous) = previous {
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let previous_path = previous.get("path").ok_or_else(|| {
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RenderError::new("No path found for chapter in JSON data")
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})?;
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if previous_path == ¤t {
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debug!("[*]: Found current chapter");
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debug!("[*]: Creating BTreeMap to inject in context");
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// Create new BTreeMap to extend the context: 'title' and 'link'
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let mut next_chapter = BTreeMap::new();
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item.get("name")
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.ok_or_else(|| {
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RenderError::new("No title found for chapter in JSON \
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data")
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})
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.and_then(|n| {
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next_chapter.insert("title".to_owned(), json!(n));
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Ok(())
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})?;
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Path::new(path).with_extension("html")
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.to_str()
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.ok_or_else(|| {
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RenderError::new("Link could not converted \
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to str")
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})
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.and_then(|l| {
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debug!("[*]: Inserting link: {:?}", l);
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// Hack for windows who tends to use `\` as separator instead of `/`
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next_chapter.insert("link".to_owned(), json!(l.replace("\\", "/")));
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Ok(())
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})?;
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debug!("[*]: Render template");
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// Render template
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_h.template()
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.ok_or_else(|| RenderError::new("Error with the handlebars template"))
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.and_then(|t| {
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let mut local_rc = rc.with_context(Context::wraps(&next_chapter)?);
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t.render(r, &mut local_rc)
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})?;
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break;
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if let Some(item) = target.find(&base_path, &path, &item, &previous)? {
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return Ok(Some(item));
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}
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}
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previous = Some(item.clone());
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}
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_ => continue,
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}
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}
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Ok(None)
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}
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fn render(
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_h: &Helper,
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r: &Handlebars,
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rc: &mut RenderContext,
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chapter: &StringMap,
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) -> Result<(), RenderError> {
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debug!("[*]: Creating BTreeMap to inject in context");
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let mut context = BTreeMap::new();
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chapter.get("name")
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.ok_or_else(|| RenderError::new("No title found for chapter in JSON data"))
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.map(|name| context.insert("title".to_owned(), json!(name)))?;
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chapter.get("path")
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.ok_or_else(|| RenderError::new("No path found for chapter in JSON data"))
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.and_then(|p| {
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Path::new(p).with_extension("html")
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.to_str()
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.ok_or_else(|| RenderError::new("Link could not be converted to str"))
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.map(|p| context.insert("link".to_owned(), json!(p.replace("\\", "/"))))
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})?;
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debug!("[*]: Render template");
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_h.template()
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.ok_or_else(|| RenderError::new("Error with the handlebars template"))
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.and_then(|t| {
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let mut local_rc = rc.with_context(Context::wraps(&context)?);
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t.render(r, &mut local_rc)
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})?;
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Ok(())
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}
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pub fn previous(_h: &Helper, r: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
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debug!("[fn]: previous (handlebars helper)");
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if let Some(previous) = find_chapter(rc, Target::Previous)? {
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render(_h, r, rc, &previous)?;
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}
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Ok(())
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}
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pub fn next(_h: &Helper, r: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
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debug!("[fn]: next (handlebars helper)");
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if let Some(next) = find_chapter(rc, Target::Next)? {
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render(_h, r, rc, &next)?;
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}
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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static TEMPLATE: &'static str =
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"{{#previous}}{{title}}: {{link}}{{/previous}}|{{#next}}{{title}}: {{link}}{{/next}}";
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#[test]
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fn test_next_previous() {
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let data = json!({
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"name": "two",
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"path": "two.path",
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"chapters": [
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{
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"name": "one",
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"path": "one.path"
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},
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{
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"name": "two",
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"path": "two.path",
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},
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{
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"name": "three",
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"path": "three.path"
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}
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]
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});
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let mut h = Handlebars::new();
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h.register_helper("previous", Box::new(previous));
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h.register_helper("next", Box::new(next));
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assert_eq!(
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h.template_render(TEMPLATE, &data).unwrap(),
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"one: one.html|three: three.html");
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}
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#[test]
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fn test_first() {
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let data = json!({
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"name": "one",
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"path": "one.path",
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"chapters": [
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{
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"name": "one",
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"path": "one.path"
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},
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{
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"name": "two",
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"path": "two.path",
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},
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{
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"name": "three",
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"path": "three.path"
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}
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]
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});
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let mut h = Handlebars::new();
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h.register_helper("previous", Box::new(previous));
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h.register_helper("next", Box::new(next));
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assert_eq!(
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h.template_render(TEMPLATE, &data).unwrap(),
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"|two: two.html");
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}
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#[test]
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fn test_last() {
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let data = json!({
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"name": "three",
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"path": "three.path",
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"chapters": [
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{
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"name": "one",
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"path": "one.path"
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},
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{
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"name": "two",
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"path": "two.path",
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},
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{
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"name": "three",
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"path": "three.path"
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}
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]
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});
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let mut h = Handlebars::new();
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h.register_helper("previous", Box::new(previous));
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h.register_helper("next", Box::new(next));
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assert_eq!(
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h.template_render(TEMPLATE, &data).unwrap(),
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"two: two.html|");
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}
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}
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