91 lines
3.1 KiB
Rust
91 lines
3.1 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, Context, Expression, Format, LogicOperator, SyntaxNode, Type, Value,
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};
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/// Abstract representation of a logic expression.
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct Logic {
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left: Expression,
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operator: LogicOperator,
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right: Expression,
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}
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impl AbstractTree for Logic {
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fn from_syntax(node: SyntaxNode, source: &str, context: &Context) -> Result<Self, SyntaxError> {
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SyntaxError::expect_syntax_node(source, "logic", node)?;
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let first_node = node.child(0).unwrap();
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let (left_node, operator_node, right_node) = {
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if first_node.is_named() {
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(first_node, node.child(1).unwrap(), node.child(2).unwrap())
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} else {
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(
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node.child(1).unwrap(),
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node.child(2).unwrap(),
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node.child(3).unwrap(),
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)
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}
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};
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let left = Expression::from_syntax(left_node, source, context)?;
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let operator = LogicOperator::from_syntax(operator_node, source, context)?;
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let right = Expression::from_syntax(right_node, source, context)?;
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Ok(Logic {
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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: &Context) -> Result<Type, ValidationError> {
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Ok(Type::Boolean)
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}
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fn validate(&self, _source: &str, _context: &Context) -> Result<(), ValidationError> {
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self.left.validate(_source, _context)?;
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self.right.validate(_source, _context)
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}
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fn run(&self, source: &str, context: &Context) -> 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 result = match self.operator {
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LogicOperator::Equal => {
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if let (Ok(left_num), Ok(right_num)) = (left.as_number(), right.as_number()) {
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left_num == right_num
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} else {
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left == right
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}
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}
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LogicOperator::NotEqual => {
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if let (Ok(left_num), Ok(right_num)) = (left.as_number(), right.as_number()) {
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left_num != right_num
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} else {
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left != right
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}
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}
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LogicOperator::And => left.as_boolean()? && right.as_boolean()?,
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LogicOperator::Or => left.as_boolean()? || right.as_boolean()?,
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LogicOperator::Greater => left > right,
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LogicOperator::Less => left < right,
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LogicOperator::GreaterOrEqual => left >= right,
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LogicOperator::LessOrEqual => left <= right,
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};
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Ok(Value::Boolean(result))
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}
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}
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impl Format for Logic {
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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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