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use crate::*;
#[derive(Clone)]
pub struct Expression {
pub source: SourceSpan,
pub tokens: Vec<ExpressionToken>,
}
#[derive(Clone)]
pub struct ExpressionToken {
pub source: SourceSpan,
pub variant: ExpressionTokenVariant,
}
#[derive(Clone)]
pub enum ExpressionTokenVariant {
Invocation(String),
Literal(isize),
Operator(Operator),
Error(ExpressionParseError),
}
#[derive(Clone, Copy, Debug)]
pub enum Operator {
Equal,
NotEqual,
LessThan,
GreaterThan,
Add,
Subtract,
LeftShift,
RightShift,
And,
Or,
Xor,
Not,
}
#[derive(Clone)]
pub enum ExpressionParseError {
InvalidHexadecimalLiteral(String),
}
impl std::fmt::Debug for Expression {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
for (i, token) in self.tokens.iter().enumerate() {
let string = match &token.variant {
ExpressionTokenVariant::Invocation(name) => name,
ExpressionTokenVariant::Literal(value) => &value.to_string(),
ExpressionTokenVariant::Operator(operator) => match operator {
Operator::Equal => "=",
Operator::NotEqual => "!=",
Operator::LessThan => "<",
Operator::GreaterThan => ">",
Operator::Add => "+",
Operator::Subtract => "-",
Operator::LeftShift => "<<",
Operator::RightShift => ">>",
Operator::And => "&",
Operator::Or => "|",
Operator::Xor => "^",
Operator::Not => "~",
}
ExpressionTokenVariant::Error(_) => "<error>",
};
match i {
0 => write!(f, "{string}")?,
_ => write!(f, " {string}")?,
}
}
return Ok(());
}
}
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