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49 lines
1.5 KiB
Rust
49 lines
1.5 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use crate::cache::EmitCache;
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use crate::cache::FastInsecureHasher;
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use crate::cache::ParsedSourceCache;
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use deno_core::error::AnyError;
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use deno_core::ModuleSpecifier;
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use deno_graph::MediaType;
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use std::sync::Arc;
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/// A hashing function that takes the source code and emit options
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/// hash then generates a string hash which can be stored to
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/// determine if the cached emit is valid or not.
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fn get_source_hash(source_text: &str, emit_options_hash: u64) -> u64 {
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FastInsecureHasher::new()
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.write_str(source_text)
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.write_u64(emit_options_hash)
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.finish()
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}
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pub fn emit_parsed_source(
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emit_cache: &EmitCache,
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parsed_source_cache: &ParsedSourceCache,
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specifier: &ModuleSpecifier,
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media_type: MediaType,
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source: &Arc<str>,
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emit_options: &deno_ast::EmitOptions,
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emit_config_hash: u64,
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) -> Result<String, AnyError> {
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let source_hash = get_source_hash(source, emit_config_hash);
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if let Some(emit_code) =
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emit_cache.get_emit_code(specifier, Some(source_hash))
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{
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Ok(emit_code)
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} else {
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// this will use a cached version if it exists
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let parsed_source = parsed_source_cache.get_or_parse_module(
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specifier,
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source.clone(),
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media_type,
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)?;
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let transpiled_source = parsed_source.transpile(emit_options)?;
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debug_assert!(transpiled_source.source_map.is_none());
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emit_cache.set_emit_code(specifier, source_hash, &transpiled_source.text);
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Ok(transpiled_source.text)
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}
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}
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