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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use crate::swc_common;
use crate::swc_common::comments::Comments;
use crate::swc_common::errors::Diagnostic;
use crate::swc_common::errors::DiagnosticBuilder;
use crate::swc_common::errors::Emitter;
use crate::swc_common::errors::Handler;
use crate::swc_common::errors::HandlerFlags;
use crate::swc_common::FileName;
use crate::swc_common::Globals;
use crate::swc_common::SourceMap;
use crate::swc_common::Span;
use crate::swc_ecma_ast;
use crate::swc_ecma_parser::lexer::Lexer;
use crate::swc_ecma_parser::JscTarget;
use crate::swc_ecma_parser::Parser;
use crate::swc_ecma_parser::Session;
use crate::swc_ecma_parser::SourceFileInput;
use crate::swc_ecma_parser::Syntax;
use crate::swc_ecma_parser::TsConfig;
use std::error::Error;
use std::fmt;
use std::sync::Arc;
use std::sync::RwLock;
#[derive(Clone, Debug)]
pub struct SwcDiagnosticBuffer {
pub diagnostics: Vec<Diagnostic>,
}
impl Error for SwcDiagnosticBuffer {}
impl fmt::Display for SwcDiagnosticBuffer {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let msg = self
.diagnostics
.iter()
.map(|d| d.message())
.collect::<Vec<String>>()
.join(",");
f.pad(&msg)
}
}
#[derive(Clone)]
pub struct SwcErrorBuffer(Arc<RwLock<SwcDiagnosticBuffer>>);
impl SwcErrorBuffer {
pub fn default() -> Self {
Self(Arc::new(RwLock::new(SwcDiagnosticBuffer {
diagnostics: vec![],
})))
}
}
impl Emitter for SwcErrorBuffer {
fn emit(&mut self, db: &DiagnosticBuilder) {
self.0.write().unwrap().diagnostics.push((**db).clone());
}
}
impl From<SwcErrorBuffer> for SwcDiagnosticBuffer {
fn from(buf: SwcErrorBuffer) -> Self {
let s = buf.0.read().unwrap();
s.clone()
}
}
/// Low-level utility structure with common AST parsing functions.
///
/// Allows to build more complicated parser by providing a callback
/// to `parse_module`.
pub struct AstParser {
pub buffered_error: SwcErrorBuffer,
pub source_map: Arc<SourceMap>,
pub handler: Handler,
pub comments: Comments,
pub globals: Globals,
}
impl AstParser {
pub fn new() -> Self {
let buffered_error = SwcErrorBuffer::default();
let handler = Handler::with_emitter_and_flags(
Box::new(buffered_error.clone()),
HandlerFlags {
dont_buffer_diagnostics: true,
can_emit_warnings: true,
..Default::default()
},
);
AstParser {
buffered_error,
source_map: Arc::new(SourceMap::default()),
handler,
comments: Comments::default(),
globals: Globals::new(),
}
}
pub fn parse_module<F, R>(
&self,
file_name: &str,
source_code: &str,
callback: F,
) -> R
where
F: FnOnce(Result<swc_ecma_ast::Module, SwcDiagnosticBuffer>) -> R,
{
swc_common::GLOBALS.set(&self.globals, || {
let swc_source_file = self.source_map.new_source_file(
FileName::Custom(file_name.to_string()),
source_code.to_string(),
);
let buffered_err = self.buffered_error.clone();
let session = Session {
handler: &self.handler,
};
let mut ts_config = TsConfig::default();
ts_config.dynamic_import = true;
let syntax = Syntax::Typescript(ts_config);
let lexer = Lexer::new(
session,
syntax,
JscTarget::Es2019,
SourceFileInput::from(&*swc_source_file),
Some(&self.comments),
);
let mut parser = Parser::new_from(session, lexer);
let parse_result =
parser
.parse_module()
.map_err(move |mut err: DiagnosticBuilder| {
err.cancel();
SwcDiagnosticBuffer::from(buffered_err)
});
callback(parse_result)
})
}
pub fn get_span_location(&self, span: Span) -> swc_common::Loc {
self.source_map.lookup_char_pos(span.lo())
}
pub fn get_span_comments(
&self,
span: Span,
) -> Vec<swc_common::comments::Comment> {
self
.comments
.take_leading_comments(span.lo())
.unwrap_or_else(|| vec![])
}
}
|
