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use std::borrow::Cow;
use crate::{
block::BlockOrSingleStatement, expressions::MultipleExpression, ParseSettings, TSXKeyword,
};
use visitable_derive::Visitable;
use super::{ASTNode, ParseResult, Span, TSXToken, Token, TokenReader};
#[derive(Debug, Clone, PartialEq, Eq, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub struct IfStatement {
pub condition: MultipleExpression,
pub inner: BlockOrSingleStatement,
pub else_conditions: Vec<ConditionalElseStatement>,
pub trailing_else: Option<UnconditionalElseStatement>,
pub position: Span,
}
#[derive(Debug, Clone, PartialEq, Eq, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub struct ConditionalElseStatement {
pub condition: MultipleExpression,
pub inner: BlockOrSingleStatement,
pub position: Span,
}
#[derive(Debug, Clone, PartialEq, Eq, Visitable)]
#[cfg_attr(feature = "self-rust-tokenize", derive(self_rust_tokenize::SelfRustTokenize))]
pub struct UnconditionalElseStatement {
pub inner: BlockOrSingleStatement,
pub position: Span,
}
impl ASTNode for IfStatement {
fn from_reader(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
) -> ParseResult<Self> {
let start_span = reader.expect_next(TSXToken::Keyword(TSXKeyword::If))?;
reader.expect_next(TSXToken::OpenParentheses)?;
let condition = MultipleExpression::from_reader(reader, state, settings)?;
reader.expect_next(TSXToken::CloseParentheses)?;
let inner = BlockOrSingleStatement::from_reader(reader, state, settings)?;
let (mut else_conditions, mut trailing_else) = (Vec::new(), None);
while let Some(Token(TSXToken::Keyword(TSXKeyword::Else), _)) = reader.peek() {
let Token(_, else_position) = reader.next().unwrap();
if matches!(reader.peek().unwrap().0, TSXToken::Keyword(TSXKeyword::If)) {
let value = ConditionalElseStatement::from_reader_sub_without_else(
reader,
state,
settings,
else_position,
)?;
else_conditions.push(value);
} else {
let unconditional_else_statement =
UnconditionalElseStatement::from_reader_sub_without_else(
reader,
state,
settings,
else_position,
)?;
trailing_else = Some(unconditional_else_statement);
break;
}
}
let position = start_span.union(&inner.get_position());
Ok(IfStatement { condition, inner, position, else_conditions, trailing_else })
}
fn get_position(&self) -> Cow<Span> {
Cow::Borrowed(&self.position)
}
fn to_string_from_buffer<T: source_map::ToString>(
&self,
buf: &mut T,
settings: &crate::ToStringSettingsAndData,
depth: u8,
) {
buf.push_str("if");
settings.0.add_gap(buf);
buf.push('(');
self.condition.to_string_from_buffer(buf, settings, depth);
buf.push(')');
settings.0.add_gap(buf);
self.inner.to_string_from_buffer(buf, settings, depth + 1);
for else_statement in self.else_conditions.iter() {
settings.0.add_gap(buf);
else_statement.to_string_from_buffer(buf, settings, depth);
}
if let Some(else_statement) = &self.trailing_else {
settings.0.add_gap(buf);
else_statement.to_string_from_buffer(buf, settings, depth);
}
}
}
impl ASTNode for ConditionalElseStatement {
fn from_reader(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
) -> ParseResult<Self> {
let else_position = reader.expect_next(TSXToken::Keyword(TSXKeyword::Else))?;
Self::from_reader_sub_without_else(reader, state, settings, else_position)
}
fn get_position(&self) -> Cow<Span> {
Cow::Borrowed(&self.position)
}
fn to_string_from_buffer<T: source_map::ToString>(
&self,
buf: &mut T,
settings: &crate::ToStringSettingsAndData,
depth: u8,
) {
buf.push_str("else if");
settings.0.add_gap(buf);
buf.push('(');
self.condition.to_string_from_buffer(buf, settings, depth);
buf.push(')');
settings.0.add_gap(buf);
self.inner.to_string_from_buffer(buf, settings, depth + 1);
}
}
impl ConditionalElseStatement {
fn from_reader_sub_without_else(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
else_position: Span,
) -> ParseResult<Self> {
reader.expect_next(TSXToken::Keyword(TSXKeyword::If))?;
reader.expect_next(TSXToken::OpenParentheses)?;
let condition = MultipleExpression::from_reader(reader, state, settings)?;
reader.expect_next(TSXToken::CloseParentheses)?;
let statements = BlockOrSingleStatement::from_reader(reader, state, settings)?;
Ok(Self {
condition,
position: else_position.union(&statements.get_position()),
inner: statements,
})
}
}
impl ASTNode for UnconditionalElseStatement {
fn from_reader(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
) -> ParseResult<Self> {
let else_position = reader.expect_next(TSXToken::Keyword(TSXKeyword::Else))?;
Self::from_reader_sub_without_else(reader, state, settings, else_position)
}
fn get_position(&self) -> Cow<Span> {
Cow::Borrowed(&self.position)
}
fn to_string_from_buffer<T: source_map::ToString>(
&self,
buf: &mut T,
settings: &crate::ToStringSettingsAndData,
depth: u8,
) {
buf.push_str("else");
settings.0.add_gap(buf);
self.inner.to_string_from_buffer(buf, settings, depth + 1);
}
}
impl UnconditionalElseStatement {
fn from_reader_sub_without_else(
reader: &mut impl TokenReader<TSXToken, Span>,
state: &mut crate::ParsingState,
settings: &ParseSettings,
else_position: Span,
) -> ParseResult<Self> {
let statements = BlockOrSingleStatement::from_reader(reader, state, settings)?;
Ok(Self { position: else_position.union(&statements.get_position()), inner: statements })
}
}