mini_builder_rs/evaluator/
contained_evaluator.rs

1use std::pin::Pin;
2
3use crate::{
4	parser::{
5		node::{Node, Nodes},
6		Parser,
7	},
8	tokenizer::{Tokenizer, TokenizerOptions},
9};
10
11use super::{
12	evaluation_context::EvaluationContext,
13	evaluator::{Evaluator, EvaluatorBuilder},
14	evaluator_builder_error::EvaluatorBuilderError,
15	Evaluate,
16};
17
18/// A self referential struct that has no external lifetimes dependencies.
19pub struct ContainedEvaluator<'a> {
20	// pins
21	_source: Pin<Box<String>>,
22	_nodes: Pin<Box<Nodes<'a>>>,
23	// slices
24	_source_slice: &'a str,
25	_nodes_slice: &'a [Box<Node<'a>>],
26	// evaluator
27	pub evaluator: Evaluator<'a, 'a>,
28}
29
30impl<'a> ContainedEvaluator<'a> {
31	pub fn from_string(source: String) -> Result<Self, EvaluatorBuilderError> {
32		// source
33		let source = Box::pin(source);
34		let source_slice = unsafe {
35			std::str::from_utf8_unchecked(std::slice::from_raw_parts(source.as_ptr(), source.len()))
36		};
37
38		// tokenize
39		let tokens =
40			Box::pin(Tokenizer::new(source_slice, TokenizerOptions::default()).tokenize()?);
41		let tokens_slice =
42			unsafe { std::slice::from_raw_parts(tokens.as_slice().as_ptr(), tokens.len()) };
43
44		// parse
45		let nodes = Box::pin(Parser::new(tokens_slice).parse()?);
46		let nodes_slice =
47			unsafe { std::slice::from_raw_parts(nodes.as_slice().as_ptr(), nodes.len()) };
48
49		// evaluator
50		let mut evaluator_builder = EvaluatorBuilder::new(nodes_slice);
51		let evaluator = evaluator_builder.build_evaluator()?;
52
53		Ok(Self {
54			// pins
55			_source: source,
56			_nodes: nodes,
57			// slices
58			_source_slice: source_slice,
59			_nodes_slice: nodes_slice,
60			evaluator,
61		})
62	}
63}
64
65impl<'a> Evaluate for ContainedEvaluator<'a> {
66	fn evaluate<'ea>(&self, context: &mut EvaluationContext<'ea, impl Evaluate>) -> String {
67		self.evaluator.evaluate(context)
68	}
69
70	fn get_dependencies(&self) -> &super::Dependencies {
71		self.evaluator.get_dependencies()
72	}
73}
mini_builder_rs/evaluator/contained_evaluator.rs

mini_builder_rs/evaluator/
contained_evaluator.rs
