Merge branch 'into_context_element_breadcrumb_tree' into into_context_element
Tom Alexander
4 years ago
commit
9b69ba7b09
GPG Key ID:
D3A179C9A53C0EDE
@ -0,0 +1,59 @@
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use crate::renderer::context_element::ContextElement;
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use crate::renderer::context_element::IceResult;
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use crate::renderer::context_element::IntoContextElement;
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use crate::renderer::context_element::IntoRcIce;
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use std::borrow::Borrow;
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use std::rc::Rc;
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#[derive(Clone, Debug)]
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pub enum BreadcrumbTreeElement<'a> {
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// Using Rc so that when we need to create BreadcrumbTrees with
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// the same BreadcrumbTreeElement but a different parent (for
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// example, when inserting behind the tail), we don't need to the
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// copy the already owned/malloc'd data.
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Owned(Rc<dyn IntoContextElement + 'a>),
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Borrowed(&'a dyn IntoContextElement),
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}
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impl<'a> BreadcrumbTreeElement<'a> {
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pub fn from_owned<I: 'a + IntoContextElement>(val: I) -> BreadcrumbTreeElement<'a> {
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BreadcrumbTreeElement::Owned(Rc::new(val))
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}
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pub fn from_borrowed(val: &'a dyn IntoContextElement) -> BreadcrumbTreeElement<'a> {
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BreadcrumbTreeElement::Borrowed(val)
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}
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}
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impl<'a> From<&'a IceResult<'a>> for BreadcrumbTreeElement<'a> {
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fn from(inp: &'a IceResult<'a>) -> Self {
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match inp {
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IceResult::Owned(rc_ce) => {
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BreadcrumbTreeElement::from_borrowed(rc_ce.from_context_element())
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}
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IceResult::Borrowed(ce) => {
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BreadcrumbTreeElement::from_borrowed(ce.from_context_element())
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}
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}
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}
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}
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impl<'a> From<IceResult<'a>> for BreadcrumbTreeElement<'a> {
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fn from(inp: IceResult<'a>) -> Self {
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match inp {
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IceResult::Owned(rc_ce) => BreadcrumbTreeElement::Owned(rc_ce.into_rc_ice()),
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IceResult::Borrowed(ce) => {
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BreadcrumbTreeElement::from_borrowed(ce.from_context_element())
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}
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}
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}
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}
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impl<'a> Borrow<dyn IntoContextElement + 'a> for BreadcrumbTreeElement<'a> {
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fn borrow(&self) -> &(dyn IntoContextElement + 'a) {
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match self {
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BreadcrumbTreeElement::Owned(ice) => ice.as_ref(),
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BreadcrumbTreeElement::Borrowed(ice) => *ice,
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}
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}
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}
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@ -0,0 +1,264 @@
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use crate::parser::KVPair;
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use crate::parser::{Filter, OwnedLiteral, PartialNameElement, RValue};
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use crate::renderer::context_element::CompareContextElement;
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use crate::renderer::context_element::ContextElement;
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use crate::renderer::context_element::IntoContextElement;
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use crate::renderer::walking::walk_path;
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use crate::renderer::DustRenderer;
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use crate::renderer::Loopable;
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use crate::renderer::RenderError;
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use crate::renderer::Renderable;
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use crate::renderer::Truthiness;
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use crate::renderer::WalkError;
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use crate::renderer::Walkable;
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use std::{cmp::Ordering, collections::HashMap};
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/// Copy the data from an RValue to an Owned struct
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///
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/// In order to get comparisons to work for our `ContextElement` trait
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/// objects, we need to be able to use `std::any::Any`. Unfortunately,
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/// `Any` requires that the structs do not have a lifetime (so they
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/// will have a `'static` lifetime. This means that we cannot have a
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/// `<'a>` appended to the struct type, so the struct cannot contain
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/// any borrows. Rather than impose the copy cost in the parser, we
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/// are imposing the cost of copying the data in the renderer because
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/// the parser has no reason to not be able to reference data from the
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/// input string.
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#[derive(Clone, Debug)]
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pub enum OwnedRValue {
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RVPath(OwnedPath),
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RVTemplate(Vec<PartialNameElement>),
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RVLiteral(OwnedLiteral),
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}
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#[derive(Clone, Debug, PartialEq)]
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pub struct OwnedPath {
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pub keys: Vec<String>,
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}
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impl From<&RValue<'_>> for OwnedRValue {
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fn from(original: &RValue<'_>) -> Self {
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match original {
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RValue::RVLiteral(literal) => OwnedRValue::RVLiteral(literal.clone()),
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RValue::RVTemplate(template) => OwnedRValue::RVTemplate(template.clone()),
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RValue::RVPath(path) => OwnedRValue::RVPath(OwnedPath {
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keys: path.keys.iter().map(|k| k.to_string()).collect(),
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}),
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}
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}
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}
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#[derive(Debug)]
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pub struct ParametersContext {
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params: HashMap<String, OwnedRValue>,
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breadcrumbs: Vec<Box<dyn IntoContextElement>>,
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}
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impl ParametersContext {
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pub fn new(
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breadcrumbs: &Vec<&dyn IntoContextElement>,
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params: &Vec<KVPair>,
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) -> ParametersContext {
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let owned_params: HashMap<String, OwnedRValue> = params
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.iter()
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.map(|kvpair| (kvpair.key.to_string(), OwnedRValue::from(&kvpair.value)))
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.collect();
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let owned_breadcrumbs: Vec<Box<dyn IntoContextElement>> =
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breadcrumbs.iter().map(|ce| ce.clone_to_box()).collect();
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ParametersContext {
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params: owned_params,
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breadcrumbs: owned_breadcrumbs,
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}
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}
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}
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impl ContextElement for ParametersContext {}
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impl Truthiness for ParametersContext {
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fn is_truthy(&self) -> bool {
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// TODO: Would this even ever be called? Won't matter, but I'd
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// like to know. Since it is injected 1 above the current
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// context, we wouldn't be able to access it with `{.}`.
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true
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}
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}
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impl Renderable for ParametersContext {
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fn render(&self, _filters: &Vec<Filter>) -> Result<String, RenderError> {
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// TODO: Would this even ever be called? Won't matter, but I'd
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// like to know. Since it is injected 1 above the current
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// context, we wouldn't be able to access it with `{.}`.
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Ok("[object Object]".to_owned())
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}
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}
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impl Loopable for ParametersContext {
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fn get_loop_elements(&self) -> Vec<&dyn ContextElement> {
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// TODO: Would this even ever be called? Won't matter, but I'd
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// like to know. Since it is injected 1 above the current
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// context, we wouldn't be able to access it with `{.}`.
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Vec::new()
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}
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}
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impl Walkable for ParametersContext {
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fn walk(&self, segment: &str) -> Result<&dyn IntoContextElement, WalkError> {
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let rval = self.params.get(segment).ok_or(WalkError::CantWalk)?;
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match rval {
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OwnedRValue::RVPath(path) => walk_path(&self.breadcrumbs, &path.keys),
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OwnedRValue::RVTemplate(template) => Ok(template),
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OwnedRValue::RVLiteral(literal) => Ok(literal),
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}
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}
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fn is_pseudo_element(&self) -> bool {
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true
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}
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}
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impl Clone for ParametersContext {
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fn clone(&self) -> Self {
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let new_params: HashMap<String, OwnedRValue> = self
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.params
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.iter()
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.map(|(k, v)| (k.clone(), v.clone()))
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.collect();
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let new_breadcrumbs: Vec<Box<dyn IntoContextElement>> = self
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.breadcrumbs
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.iter()
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.map(|bread| bread.clone_to_box())
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.collect();
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ParametersContext {
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params: new_params,
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breadcrumbs: new_breadcrumbs,
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}
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}
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}
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impl CompareContextElement for ParametersContext {
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fn equals(&self, other: &dyn ContextElement) -> bool {
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// TODO: Does this ever happen? perhaps I should have a panic here.
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false
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}
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fn partial_compare(&self, other: &dyn ContextElement) -> Option<Ordering> {
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// TODO: Does this ever happen? perhaps I should have a panic here.
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None
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}
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}
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impl ContextElement for OwnedLiteral {}
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impl Truthiness for OwnedLiteral {
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fn is_truthy(&self) -> bool {
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match self {
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OwnedLiteral::LString(text) => !text.is_empty(),
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OwnedLiteral::LPositiveInteger(num) => true,
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}
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}
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}
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impl Renderable for OwnedLiteral {
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fn render(&self, _filters: &Vec<Filter>) -> Result<String, RenderError> {
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match self {
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OwnedLiteral::LString(text) => Ok(text.clone()),
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OwnedLiteral::LPositiveInteger(num) => Ok(num.to_string()),
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}
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}
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}
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impl Loopable for OwnedLiteral {
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fn get_loop_elements(&self) -> Vec<&dyn ContextElement> {
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Vec::new()
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}
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}
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impl Walkable for OwnedLiteral {
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fn walk(&self, segment: &str) -> Result<&dyn IntoContextElement, WalkError> {
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Err(WalkError::CantWalk)
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}
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}
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impl CompareContextElement for OwnedLiteral {
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fn equals(&self, other: &dyn ContextElement) -> bool {
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// println!("equals literal {:?} | {:?}", self, other);
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// If its an OwnedLiteral then compare them directly,
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// otherwise defer to the other type's implementation of
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// CompareContextElement since the end user could add any
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// type.
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match other.to_any().downcast_ref::<Self>() {
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None => other.equals(self),
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Some(other_literal) => match (self, other_literal) {
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(OwnedLiteral::LString(self_text), OwnedLiteral::LString(other_text)) => {
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self_text == other_text
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}
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(OwnedLiteral::LPositiveInteger(self_num), OwnedLiteral::LString(other_text)) => {
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&self_num.to_string() == other_text
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}
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(OwnedLiteral::LString(self_text), OwnedLiteral::LPositiveInteger(other_num)) => {
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self_text == &other_num.to_string()
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}
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(
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OwnedLiteral::LPositiveInteger(self_num),
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OwnedLiteral::LPositiveInteger(other_num),
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) => self_num == other_num,
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},
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}
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}
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fn partial_compare(&self, other: &dyn ContextElement) -> Option<Ordering> {
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// println!("partial_compare literal {:?} | {:?}", self, other);
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// If its an OwnedLiteral then compare them directly,
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// otherwise defer to the other type's implementation of
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// CompareContextElement since the end user could add any
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// type.
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match other.to_any().downcast_ref::<Self>() {
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None => match other.partial_compare(self) {
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None => None,
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Some(ord) => match ord {
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Ordering::Equal => Some(Ordering::Equal),
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Ordering::Greater => Some(Ordering::Less),
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Ordering::Less => Some(Ordering::Greater),
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},
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},
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Some(other_literal) => match (self, other_literal) {
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(OwnedLiteral::LString(self_text), OwnedLiteral::LString(other_text)) => {
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self_text.partial_cmp(other_text)
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}
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(OwnedLiteral::LPositiveInteger(self_num), OwnedLiteral::LString(other_text)) => {
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self_num.to_string().partial_cmp(other_text)
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}
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(OwnedLiteral::LString(self_text), OwnedLiteral::LPositiveInteger(other_num)) => {
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self_text.partial_cmp(&other_num.to_string())
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}
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(
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OwnedLiteral::LPositiveInteger(self_num),
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OwnedLiteral::LPositiveInteger(other_num),
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) => self_num.partial_cmp(other_num),
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},
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}
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}
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}
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impl IntoContextElement for Vec<PartialNameElement> {
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fn into_context_element(
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&self,
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renderer: &DustRenderer,
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breadcrumbs: &Vec<&dyn IntoContextElement>,
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) -> &dyn ContextElement {
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// OwnedLiteral::LString(
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// renderer
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// .render_partial_name(self, breadcrumbs)
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// .expect("TODO: Make into_context_element return a RenderError"),
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// )
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// TODO
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&OwnedLiteral::LPositiveInteger(1)
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}
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}
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impl Walkable for Vec<PartialNameElement> {
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fn walk(&self, segment: &str) -> Result<&dyn IntoContextElement, WalkError> {
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Err(WalkError::CantWalk)
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}
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}
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File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,94 @@
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use crate::renderer::breadcrumb_tree::BreadcrumbTreeElement;
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use crate::renderer::context_element::IntoContextElement;
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use crate::renderer::WalkError;
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use std::borrow::Borrow;
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enum WalkResult<'a> {
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NoWalk,
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PartialWalk,
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FullyWalked(&'a dyn IntoContextElement),
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}
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fn walk_path_from_single_level<'a, P>(
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context: &'a dyn IntoContextElement,
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path: &[P],
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) -> WalkResult<'a>
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where
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P: Borrow<str>,
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{
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if path.is_empty() {
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return WalkResult::FullyWalked(context);
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}
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let mut walk_failure = WalkResult::NoWalk;
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let mut output = context;
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for elem in path.iter() {
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match output.walk(elem.borrow()) {
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Err(WalkError::CantWalk { .. }) => {
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return walk_failure;
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}
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Ok(new_val) => {
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walk_failure = WalkResult::PartialWalk;
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output = new_val;
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}
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}
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}
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WalkResult::FullyWalked(output)
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}
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fn get_first_non_pseudo_element<'a>(
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breadcrumbs: &'a Vec<BreadcrumbTreeElement<'a>>,
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) -> Option<&'a BreadcrumbTreeElement<'a>> {
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breadcrumbs
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.iter()
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.rev()
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.filter(|b| {
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!std::borrow::Borrow::<dyn IntoContextElement + 'a>::borrow(*b).is_pseudo_element()
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})
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.next()
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}
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pub fn walk_path<'a, P>(
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breadcrumbs: &'a Vec<BreadcrumbTreeElement<'a>>,
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path: &Vec<P>,
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) -> Result<&'a dyn IntoContextElement, WalkError>
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where
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P: Borrow<str>,
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{
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match (breadcrumbs.last(), path.first()) {
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(None, _) => return Err(WalkError::CantWalk),
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(Some(last_elem), None) => return Ok(last_elem.borrow()),
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(Some(_), Some(path_first)) if path_first.borrow() == "." => {
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let first_non_pseudo_element = get_first_non_pseudo_element(breadcrumbs);
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return match first_non_pseudo_element {
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None => Err(WalkError::CantWalk),
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Some(current_context) => {
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match walk_path_from_single_level(current_context.borrow(), &path[1..]) {
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// If no walking was done at all or we partially walked
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// then stop trying to find anything because '.' restricts
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// us to the current scope
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WalkResult::NoWalk | WalkResult::PartialWalk => Err(WalkError::CantWalk),
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WalkResult::FullyWalked(new_context) => Ok(new_context),
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}
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}
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};
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}
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(Some(_), Some(path_first)) => {
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for context in breadcrumbs.iter().rev() {
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match walk_path_from_single_level(context.borrow(), path) {
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// If no walking was done at all, keep looping
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WalkResult::NoWalk => {}
|
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// If we partially walked then stop trying to find
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// anything
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WalkResult::PartialWalk => {
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return Err(WalkError::CantWalk);
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}
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WalkResult::FullyWalked(new_context) => return Ok(new_context),
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}
|
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}
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}
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}
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Err(WalkError::CantWalk)
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}
|
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