113 lines
3.5 KiB
Rust
113 lines
3.5 KiB
Rust
use serde::{Deserialize, Serialize};
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use crate::{AbstractTree, Block, Expression, Format, Map, Result, SyntaxNode, Type, Value};
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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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}
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impl AbstractTree for IfElse {
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fn from_syntax(node: SyntaxNode, source: &str, 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(if_expression_node, source, 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(if_block_node, source, 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(expression_node, source, 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(block_node, source, 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(else_node, source, 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::none())
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}
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}
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}
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fn expected_type(&self, context: &Map) -> Result<Type> {
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self.if_block.expected_type(context)
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}
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}
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impl Format for IfElse {
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fn format(&self, output: &mut String, indent_level: u8) {
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output.push_str("if ");
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self.if_expression.format(output, indent_level);
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output.push(' ');
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self.if_block.format(output, indent_level);
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let else_ifs = self
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.else_if_expressions
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.iter()
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.zip(self.else_if_blocks.iter());
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for (expression, block) in else_ifs {
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output.push_str("else if ");
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expression.format(output, indent_level);
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output.push(' ');
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block.format(output, indent_level);
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}
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if let Some(block) = &self.else_block {
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output.push_str("else ");
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block.format(output, indent_level);
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}
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}
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}
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