86 lines
2.8 KiB
Rust
86 lines
2.8 KiB
Rust
use serde::{Deserialize, Serialize};
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use tree_sitter::Node;
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use crate::{AbstractTree, Expression, Result, Statement, Value, VariableMap};
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct IfElse {
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if_expression: Expression,
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then_statement: Statement,
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else_if_expressions: Vec<Expression>,
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else_if_statements: Vec<Statement>,
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else_statement: Option<Statement>,
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}
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impl AbstractTree for IfElse {
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fn from_syntax_node(source: &str, node: Node) -> Result<Self> {
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let if_node = node.child(0).unwrap().child(1).unwrap();
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let if_expression = Expression::from_syntax_node(source, if_node)?;
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let then_node = node.child(0).unwrap().child(3).unwrap();
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let then_statement = Statement::from_syntax_node(source, then_node)?;
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let child_count = node.child_count();
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let mut else_if_expressions = Vec::new();
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let mut else_if_statements = Vec::new();
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let mut else_statement = None;
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for index in 1..child_count {
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let child = node.child(index);
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if let Some(node) = child {
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if node.kind() == "else_if" {
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let expression_node = node.child(1).unwrap();
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let expression = Expression::from_syntax_node(source, expression_node)?;
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else_if_expressions.push(expression);
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let statement_node = node.child(3).unwrap();
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let statement = Statement::from_syntax_node(source, statement_node)?;
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else_if_statements.push(statement);
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}
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if node.kind() == "else" {
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let else_node = node.child(2).unwrap();
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else_statement = Some(Statement::from_syntax_node(source, else_node)?);
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}
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}
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}
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Ok(IfElse {
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if_expression,
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then_statement,
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else_if_expressions,
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else_if_statements,
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else_statement,
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})
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}
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fn run(&self, source: &str, context: &mut VariableMap) -> Result<Value> {
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let if_boolean = self.if_expression.run(source, context)?.as_boolean()?;
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if if_boolean {
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self.then_statement.run(source, context)
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} else {
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let expressions = &self.else_if_expressions;
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for (index, expression) in expressions.into_iter().enumerate() {
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let if_boolean = expression.run(source, context)?.as_boolean()?;
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if if_boolean {
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let statement = self.else_if_statements.get(index).unwrap();
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return statement.run(source, context);
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}
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}
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if let Some(statement) = &self.else_statement {
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statement.run(source, context)
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} else {
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Ok(Value::Empty)
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}
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}
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}
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}
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