107 lines
3.5 KiB
Rust
107 lines
3.5 KiB
Rust
use serde::{Deserialize, Serialize};
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use tree_sitter::Node;
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use crate::{AbstractTree, Error, Expression, Map, Result, Type, Value};
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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(source: &str, node: Node, context: &Map) -> Result<Self> {
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Error::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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(
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first_node,
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node.child(1).unwrap().child(0).unwrap(),
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node.child(2).unwrap(),
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)
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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().child(0).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_node(source, left_node, context)?;
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let operator = match operator_node.kind() {
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"==" => LogicOperator::Equal,
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"!=" => LogicOperator::NotEqual,
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"&&" => LogicOperator::And,
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"||" => LogicOperator::Or,
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">" => LogicOperator::Greater,
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"<" => LogicOperator::Less,
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">=" => LogicOperator::GreaterOrEqual,
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"<=" => LogicOperator::LessOrEqaul,
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_ => {
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return Err(Error::UnexpectedSyntaxNode {
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expected: "==, !=, &&, ||, >, <, >= or <=".to_string(),
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actual: operator_node.kind().to_string(),
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location: operator_node.start_position(),
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relevant_source: source[operator_node.byte_range()].to_string(),
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})
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}
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};
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let right = Expression::from_syntax_node(source, right_node, 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 run(&self, source: &str, context: &Map) -> Result<Value> {
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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::LessOrEqaul => left <= right,
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};
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Ok(Value::Boolean(result))
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}
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fn expected_type(&self, _context: &Map) -> Result<Type> {
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Ok(Type::Boolean)
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}
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}
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub enum LogicOperator {
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Equal,
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NotEqual,
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And,
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Or,
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Greater,
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Less,
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GreaterOrEqual,
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LessOrEqaul,
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}
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