72 lines
2.3 KiB
Rust
72 lines
2.3 KiB
Rust
use serde::{Deserialize, Serialize};
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use crate::{
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error::{RuntimeError, SyntaxError, ValidationError},
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AbstractTree, Error, Expression, Format, Map, MathOperator, SyntaxNode, Type, Value,
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};
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/// Abstract representation of a math operation.
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///
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/// Dust currently supports the four basic operations and the modulo (or
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/// remainder) operator.
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct Math {
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left: Expression,
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operator: MathOperator,
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right: Expression,
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}
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impl AbstractTree for Math {
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fn from_syntax(node: SyntaxNode, source: &str, context: &Map) -> Result<Self, SyntaxError> {
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Error::expect_syntax_node(source, "math", node)?;
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let left_node = node.child(0).unwrap();
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let left = Expression::from_syntax(left_node, source, context)?;
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let operator_node = node.child(1).unwrap();
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let operator = MathOperator::from_syntax(operator_node, source, context)?;
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let right_node = node.child(2).unwrap();
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let right = Expression::from_syntax(right_node, source, context)?;
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Ok(Math {
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left,
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operator,
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right,
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})
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}
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fn expected_type(&self, context: &Map) -> Result<Type, ValidationError> {
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self.left.expected_type(context)
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}
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fn check_type(&self, _source: &str, _context: &Map) -> Result<(), ValidationError> {
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self.left.check_type(_source, _context)?;
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self.right.check_type(_source, _context)
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}
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fn run(&self, source: &str, context: &Map) -> Result<Value, RuntimeError> {
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let left = self.left.run(source, context)?;
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let right = self.right.run(source, context)?;
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let value = match self.operator {
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MathOperator::Add => left + right,
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MathOperator::Subtract => left - right,
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MathOperator::Multiply => left * right,
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MathOperator::Divide => left / right,
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MathOperator::Modulo => left % right,
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}?;
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Ok(value)
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}
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}
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impl Format for Math {
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fn format(&self, output: &mut String, indent_level: u8) {
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self.left.format(output, indent_level);
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output.push(' ');
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self.operator.format(output, indent_level);
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output.push(' ');
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self.right.format(output, indent_level);
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}
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}
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