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TermCache

nickel_lang_core::cache

Struct TermCache 

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pub struct TermCache { /* private fields */ }
Expand description

The term cache stores the parsed values (the runtime representation) of sources.

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impl TermCache

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pub fn new() -> Self

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pub fn update_state( &mut self, file_id: FileId, new: TermEntryState, ) -> Result<TermEntryState, TermNotFound>

Updates the state of an entry and returns the previous state, or an error if the entry isn’t in the cache.

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pub fn entry_state(&self, file_id: FileId) -> Option<TermEntryState>

Retrieves the state of an entry. Returns None if the entry is not in the term cache. This might happen if the file hasn’t been parsed, or if the term cache hasn’t be filled from the AST cache yet. The latter is supposed to happen right before program transformations.

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pub fn closurize<C: EvalCache>( &mut self, cache: &mut C, import_data: &ImportData, file_id: FileId, ) -> Result<CacheOp<()>, TermCacheError<()>>

Replaces a cache entry by a closurized version of itself. If it contains imports, closurize them recursively.

Closurization is not required before evaluation, but it has two benefits:

  • the closurized term uses the evaluation cache, so if it is imported in multiple places then they will share a cache
  • the eval cache’s built-in mechanism for preventing infinite recursion will also apply to recursive imports.

The main disadvantage of closurization is that it makes the resulting runtime representation less useful. You wouldn’t want to closurize before pretty-printing, for example. This isn’t as important these days, since we also have the AST representation at hand.

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pub fn terms(&self) -> &HashMap<FileId, TermEntry>

Returns an immutable reference to the whole term cache.

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pub fn get_owned(&self, file_id: FileId) -> Option<NickelValue>

Retrieves a fresh clone of a cached term.

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pub fn get(&self, file_id: FileId) -> Option<&NickelValue>

Retrieves a reference to a cached term.

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pub fn get_entry(&self, file_id: FileId) -> Option<&TermEntry>

Retrieves the whole entry for a given file id.

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pub fn contains(&self, file_id: FileId) -> bool

Returns true if the term cache contains a term for the given file id.

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pub fn insert(&mut self, file_id: FileId, entry: TermEntry)

Inserts a new entry in the cache. Usually, this should be handled by CacheHub directly, but there are some use-cases where it is useful to pre-fill the term cache (typically in NLS).

Trait Implementations§

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impl Clone for TermCache

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fn clone(&self) -> TermCache

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for TermCache

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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Change the foreground color to green
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Change the background color to green
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Change the foreground color to yellow
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Change the background color to yellow
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Change the foreground color to blue
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Change the background color to blue
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Change the foreground color to magenta
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Change the background color to magenta
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Change the foreground color to purple
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Change the background color to purple
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Change the foreground color to cyan
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Change the background color to cyan
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Change the foreground color to the terminal default
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Change the background color to the terminal default
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Change the foreground color to bright green
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Change the background color to bright green
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Change the foreground color to bright yellow
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Change the foreground color to bright purple
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Change the background color to bright purple
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Make the text bold
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Make the text dim
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Make the text italicized
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Make the text underlined
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Swap the foreground and background colors
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Hide the text
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Cross out the text
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Set the foreground color at runtime. Only use if you do not know which color will be used at compile-time. If the color is constant, use either OwoColorize::fg or a color-specific method, such as OwoColorize::green, Read more
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Set the foreground color to a specific RGB value.
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Set the background color to a specific RGB value.
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Sets the foreground color to an RGB value.
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Sets the background color to an RGB value.
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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T, U> WrappingInto<U> for T
where U: WrappingFrom<T>,

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fn wrapping_into(self) -> U