2023-10-06 17:32:58 +00:00
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use serde::{Deserialize, Serialize};
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use tree_sitter::Node;
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2023-11-30 05:57:15 +00:00
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use crate::{AbstractTree, Block, Expression, Map, Result, TypeDefinition, Value};
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2023-10-06 17:32:58 +00:00
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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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if_block: Block,
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else_if_expressions: Vec<Expression>,
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else_if_blocks: Vec<Block>,
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else_block: Option<Block>,
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2023-10-06 17:32:58 +00:00
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}
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impl AbstractTree for IfElse {
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fn from_syntax_node(source: &str, node: Node, context: &Map) -> Result<Self> {
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let if_expression_node = node.child(0).unwrap().child(1).unwrap();
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let if_expression = Expression::from_syntax_node(source, if_expression_node, context)?;
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let if_block_node = node.child(0).unwrap().child(2).unwrap();
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let if_block = Block::from_syntax_node(source, if_block_node, context)?;
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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_blocks = Vec::new();
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let mut else_block = None;
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for index in 1..child_count {
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let child = node.child(index).unwrap();
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if child.kind() == "else_if" {
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let expression_node = child.child(1).unwrap();
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let expression = Expression::from_syntax_node(source, expression_node, context)?;
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else_if_expressions.push(expression);
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let block_node = child.child(2).unwrap();
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let block = Block::from_syntax_node(source, block_node, context)?;
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else_if_blocks.push(block);
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}
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if child.kind() == "else" {
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let else_node = child.child(1).unwrap();
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else_block = Some(Block::from_syntax_node(source, else_node, context)?);
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}
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}
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Ok(IfElse {
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if_expression,
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if_block,
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else_if_expressions,
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else_if_blocks,
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else_block,
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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 if_boolean = self.if_expression.run(source, context)?.as_boolean()?;
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if if_boolean {
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self.if_block.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.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 block = self.else_if_blocks.get(index).unwrap();
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return block.run(source, context);
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}
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}
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if let Some(block) = &self.else_block {
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block.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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fn expected_type(&self, context: &Map) -> Result<TypeDefinition> {
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self.if_block.expected_type(context)
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}
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}
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2023-11-30 14:48:56 +00:00
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#[cfg(test)]
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mod tests {
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use crate::{evaluate, Value};
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#[test]
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fn evaluate_if() {
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assert_eq!(
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evaluate("if true { 'true' }"),
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Ok(Value::String("true".to_string()))
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);
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}
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#[test]
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fn evaluate_if_else() {
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assert_eq!(evaluate("if false { 1 } else { 2 }"), Ok(Value::Integer(2)));
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assert_eq!(
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evaluate("if true { 1.0 } else { 42.0 }"),
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Ok(Value::Float(1.0))
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);
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}
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#[test]
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fn evaluate_if_else_else_if_else() {
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assert_eq!(
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evaluate(
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"
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if false {
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'no'
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} else if 1 + 1 == 3 {
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'nope'
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} else {
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'ok'
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}
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"
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),
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Ok(Value::String("ok".to_string()))
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);
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}
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#[test]
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fn evaluate_if_else_if_else_if_else_if_else() {
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assert_eq!(
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evaluate(
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"
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if false {
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'no'
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} else if 1 + 1 == 1 {
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'nope'
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} else if 9 / 2 == 4 {
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'nope'
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} else if 'foo' == 'bar' {
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'nope'
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} else {
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'ok'
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}
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"
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),
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Ok(Value::String("ok".to_string()))
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);
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}
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}
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