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use std::borrow::Cow;
use crate::{
block::BlockOrSingleStatement, ParseSettings, TSXKeyword, VariableField,
VariableFieldInSourceCode, WithComment,
};
use visitable_derive::Visitable;
use super::{
variable::VariableKeyword, ASTNode, Expression, ParseResult, Span, TSXToken, Token,
TokenReader, VariableStatement,
};
#[derive(Debug, Clone, PartialEq, Eq, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub struct ForLoopStatement {
pub condition: ForLoopCondition,
pub inner: BlockOrSingleStatement,
pub position: Span,
}
impl ASTNode for ForLoopStatement {
fn get_position(&self) -> Cow<Span> {
Cow::Borrowed(&self.position)
}
fn from_reader(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
) -> ParseResult<Self> {
let start_pos = reader.expect_next(TSXToken::Keyword(TSXKeyword::For))?;
let condition = ForLoopCondition::from_reader(reader, state, settings)?;
let inner = BlockOrSingleStatement::from_reader(reader, state, settings)?;
let position = start_pos.union(&inner.get_position());
Ok(ForLoopStatement { condition, inner, position })
}
fn to_string_from_buffer<T: source_map::ToString>(
&self,
buf: &mut T,
settings: &crate::ToStringSettingsAndData,
depth: u8,
) {
buf.push_str("for");
settings.0.add_gap(buf);
self.condition.to_string_from_buffer(buf, settings, depth);
settings.0.add_gap(buf);
self.inner.to_string_from_buffer(buf, settings, depth + 1);
}
}
#[derive(Debug, Clone, PartialEq, Eq, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub enum ForLoopStatementInitializer {
Statement(VariableStatement),
Expression(Expression),
}
#[derive(Debug, Clone, PartialEq, Eq, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub enum ForLoopCondition {
ForOf {
keyword: VariableKeyword,
variable: WithComment<VariableField<VariableFieldInSourceCode>>,
of: Expression,
},
ForIn {
keyword: VariableKeyword,
variable: WithComment<VariableField<VariableFieldInSourceCode>>,
in_condition: Expression,
},
Statements {
initializer: ForLoopStatementInitializer,
condition: Expression,
final_expression: Expression,
},
}
impl ASTNode for ForLoopCondition {
fn get_position(&self) -> Cow<Span> {
todo!()
}
fn from_reader(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
) -> ParseResult<Self> {
reader.expect_next(TSXToken::OpenParentheses)?;
let mut destructuring_depth = 0;
let mut ate_variable_specifier = false;
let next = reader.scan(|token, _| {
if ate_variable_specifier {
match token {
TSXToken::OpenBrace | TSXToken::OpenBracket => destructuring_depth += 1,
TSXToken::CloseBrace | TSXToken::CloseBracket => destructuring_depth -= 1,
_ => {}
}
destructuring_depth == 0
} else {
ate_variable_specifier = true;
false
}
});
let condition = match next.map(|Token(tok, _)| tok) {
Some(TSXToken::Keyword(TSXKeyword::Of)) => {
let keyword = VariableKeyword::from_reader(reader.next().unwrap())?;
let variable = ASTNode::from_reader(reader, state, settings)?;
reader.expect_next(TSXToken::Keyword(TSXKeyword::Of))?;
let of = Expression::from_reader(reader, state, settings)?;
Self::ForOf { variable, keyword, of }
}
Some(TSXToken::Keyword(TSXKeyword::In)) => {
let keyword = VariableKeyword::from_reader(reader.next().unwrap())?;
let variable = ASTNode::from_reader(reader, state, settings)?;
reader.expect_next(TSXToken::Keyword(TSXKeyword::In))?;
let in_condition = Expression::from_reader(reader, state, settings)?;
Self::ForIn { variable, keyword, in_condition }
}
_ => {
let initializer = if let Some(Token(
TSXToken::Keyword(TSXKeyword::Const | TSXKeyword::Let | TSXKeyword::Var),
_,
)) = reader.peek()
{
VariableStatement::from_reader(reader, state, settings)
.map(ForLoopStatementInitializer::Statement)
} else {
Expression::from_reader(reader, state, settings)
.map(ForLoopStatementInitializer::Expression)
}?;
reader.expect_next(TSXToken::SemiColon)?;
let condition = Expression::from_reader(reader, state, settings)?;
reader.expect_next(TSXToken::SemiColon)?;
let final_expression = Expression::from_reader(reader, state, settings)?;
Self::Statements { initializer, condition, final_expression }
}
};
reader.expect_next(TSXToken::CloseParentheses)?;
Ok(condition)
}
fn to_string_from_buffer<T: source_map::ToString>(
&self,
buf: &mut T,
settings: &crate::ToStringSettingsAndData,
depth: u8,
) {
buf.push('(');
match self {
Self::ForOf { keyword, variable, of } => {
buf.push_str(keyword.as_str());
variable.to_string_from_buffer(buf, settings, depth);
buf.push_str(" of ");
of.to_string_from_buffer(buf, settings, depth);
}
Self::ForIn { keyword, variable, in_condition } => {
buf.push_str(keyword.as_str());
variable.to_string_from_buffer(buf, settings, depth);
buf.push_str(" in ");
in_condition.to_string_from_buffer(buf, settings, depth);
}
Self::Statements { initializer, condition, final_expression } => {
match initializer {
ForLoopStatementInitializer::Statement(stmt) => {
stmt.to_string_from_buffer(buf, settings, depth)
}
ForLoopStatementInitializer::Expression(expr) => {
expr.to_string_from_buffer(buf, settings, depth)
}
}
buf.push(';');
settings.0.add_gap(buf);
condition.to_string_from_buffer(buf, settings, depth);
buf.push(';');
settings.0.add_gap(buf);
final_expression.to_string_from_buffer(buf, settings, depth);
}
}
buf.push(')');
}
}