darklua_core/frontend/
work_cache.rs

1use std::{
2    collections::HashMap,
3    fmt,
4    path::{Path, PathBuf},
5};
6
7use elsa::FrozenMap;
8
9use crate::{nodes::Block, DarkluaError, Parser, Resources};
10
11use super::DarkluaResult;
12
13pub struct WorkCache<'a> {
14    resources: &'a Resources,
15    input_to_block: FrozenMap<PathBuf, Box<Block>>,
16    input_to_output: HashMap<PathBuf, PathBuf>,
17}
18
19impl<'a> Clone for WorkCache<'a> {
20    fn clone(&self) -> Self {
21        Self {
22            resources: self.resources,
23            input_to_block: Default::default(),
24            input_to_output: self.input_to_output.clone(),
25        }
26    }
27}
28
29impl<'a> fmt::Debug for WorkCache<'a> {
30    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
31        f.debug_struct("WorkCache")
32            .field("resources", &self.resources)
33            .field("input_to_output", &self.input_to_output)
34            .finish_non_exhaustive()
35    }
36}
37
38impl<'a> WorkCache<'a> {
39    pub fn new(resources: &'a Resources) -> Self {
40        Self {
41            resources,
42            input_to_block: Default::default(),
43            input_to_output: Default::default(),
44        }
45    }
46
47    pub fn link_source_to_output(
48        &mut self,
49        source: impl Into<PathBuf>,
50        output: impl Into<PathBuf>,
51    ) {
52        self.input_to_output.insert(source.into(), output.into());
53    }
54
55    pub fn contains(&self, source: impl AsRef<Path>) -> bool {
56        self.input_to_output.contains_key(source.as_ref())
57    }
58
59    pub fn get_block(&self, source: impl AsRef<Path>, parser: &Parser) -> DarkluaResult<&Block> {
60        let source = source.as_ref();
61        if let Some(block) = self.input_to_block.get(source) {
62            log::trace!("found cached block for `{}`", source.display());
63            Ok(block)
64        } else {
65            log::trace!("caching block for `{}`", source.display());
66            let block = self.read_block(source, parser)?;
67            Ok(self
68                .input_to_block
69                .insert(source.to_path_buf(), Box::new(block)))
70        }
71    }
72
73    fn read_block(&self, source: &Path, parser: &Parser) -> DarkluaResult<Block> {
74        if let Some(output_path) = self.input_to_output.get(source) {
75            let content = self.resources.get(output_path)?;
76            parser.parse(&content).map_err(|parser_error| {
77                DarkluaError::parser_error(output_path, parser_error)
78                    .context("parsing an already generated file")
79            })
80        } else {
81            Err(DarkluaError::uncached_work(source))
82        }
83    }
84}
darklua_core/frontend/work_cache.rs

darklua_core/frontend/
work_cache.rs
