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use std::borrow::Cow;
use crate::{
errors::parse_lexing_error, ASTNode, Expression, Keyword, ParseResult, ParseSettings, Span,
StatementPosition, TSXKeyword, TSXToken, Token,
};
use super::{
variable::VariableDeclaration, ClassDeclaration, InterfaceDeclaration, StatementFunction,
TypeAlias,
};
use tokenizer_lib::TokenReader;
use visitable_derive::Visitable;
#[derive(Debug, PartialEq, Eq, Clone, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub enum ExportDeclaration {
Variable { exported: Exportable, position: Span },
Default { expression: Box<Expression>, position: Span },
}
#[derive(Debug, PartialEq, Eq, Clone, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub enum Exportable {
Class(ClassDeclaration<StatementPosition>),
Function(StatementFunction),
Variable(VariableDeclaration),
Interface(InterfaceDeclaration),
TypeAlias(TypeAlias),
}
impl ASTNode for ExportDeclaration {
fn get_position(&self) -> Cow<Span> {
match self {
ExportDeclaration::Variable { position, .. }
| ExportDeclaration::Default { position, .. } => Cow::Borrowed(position),
}
}
fn from_reader(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
) -> ParseResult<Self> {
let start = reader.expect_next(TSXToken::Keyword(TSXKeyword::Export))?;
let is_default =
matches!(reader.peek(), Some(Token(TSXToken::Keyword(TSXKeyword::Default), _)));
if is_default {
reader.next();
let expression = Expression::from_reader(reader, state, settings)?;
let position = start.union(&expression.get_position());
Ok(ExportDeclaration::Default { expression: Box::new(expression), position })
} else {
match reader.peek().ok_or_else(parse_lexing_error)? {
Token(TSXToken::Keyword(TSXKeyword::Class), _) => {
let Token(_, pos) = reader.next().unwrap();
let keyword = Keyword::new(pos);
let class_declaration = ClassDeclaration::from_reader_sub_class_keyword(
reader, state, settings, keyword,
)?;
let position = start.union(&class_declaration.get_position());
Ok(Self::Variable { exported: Exportable::Class(class_declaration), position })
}
Token(TSXToken::Keyword(TSXKeyword::Function), _) => {
let function_declaration =
StatementFunction::from_reader(reader, state, settings)?;
let position = start.union(&function_declaration.get_position());
Ok(Self::Variable {
exported: Exportable::Function(function_declaration),
position,
})
}
Token(
TSXToken::Keyword(TSXKeyword::Const) | TSXToken::Keyword(TSXKeyword::Let),
_,
) => {
let variable_declaration =
VariableDeclaration::from_reader(reader, state, settings)?;
let position = start.union(&variable_declaration.get_position());
Ok(Self::Variable {
exported: Exportable::Variable(variable_declaration),
position,
})
}
Token(TSXToken::Keyword(TSXKeyword::Interface), _) => {
let interface_declaration =
InterfaceDeclaration::from_reader(reader, state, settings)?;
let position = start.union(&interface_declaration.get_position());
Ok(Self::Variable {
exported: Exportable::Interface(interface_declaration),
position,
})
}
Token(TSXToken::Keyword(TSXKeyword::Type), _) => {
let type_alias = TypeAlias::from_reader(reader, state, settings)?;
let position = start.union(&type_alias.get_position());
Ok(Self::Variable { exported: Exportable::TypeAlias(type_alias), position })
}
Token(token, _) => {
unimplemented!("Token after export '{:?}'", token)
}
}
}
}
fn to_string_from_buffer<T: source_map::ToString>(
&self,
buf: &mut T,
settings: &crate::ToStringSettingsAndData,
depth: u8,
) {
match self {
ExportDeclaration::Variable { exported, .. } => {
buf.push_str("export ");
match exported {
Exportable::Class(class_declaration) => {
class_declaration.to_string_from_buffer(buf, settings, depth);
}
Exportable::Function(function_declaration) => {
function_declaration.to_string_from_buffer(buf, settings, depth);
}
Exportable::Interface(interface_declaration) => {
interface_declaration.to_string_from_buffer(buf, settings, depth);
}
Exportable::Variable(variable_dec_stmt) => {
variable_dec_stmt.to_string_from_buffer(buf, settings, depth);
}
Exportable::TypeAlias(type_alias) => {
type_alias.to_string_from_buffer(buf, settings, depth);
}
}
}
ExportDeclaration::Default { expression, position: _ } => {
buf.push_str("export default ");
expression.to_string_from_buffer(buf, settings, depth);
}
}
}
}