114 lines
3.4 KiB
Rust
114 lines
3.4 KiB
Rust
use std::fmt::{self, Display, Formatter};
|
|
|
|
use serde::{Deserialize, Serialize};
|
|
use tree_sitter::Node;
|
|
|
|
use crate::{AbstractTree, Block, Expression, Map, Result, Type, Value};
|
|
|
|
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
|
|
pub struct IfElse {
|
|
if_expression: Expression,
|
|
if_block: Block,
|
|
else_if_expressions: Vec<Expression>,
|
|
else_if_blocks: Vec<Block>,
|
|
else_block: Option<Block>,
|
|
}
|
|
|
|
impl AbstractTree for IfElse {
|
|
fn from_syntax_node(source: &str, node: Node, context: &Map) -> Result<Self> {
|
|
let if_expression_node = node.child(0).unwrap().child(1).unwrap();
|
|
let if_expression = Expression::from_syntax_node(source, if_expression_node, context)?;
|
|
|
|
let if_block_node = node.child(0).unwrap().child(2).unwrap();
|
|
let if_block = Block::from_syntax_node(source, if_block_node, context)?;
|
|
|
|
let child_count = node.child_count();
|
|
let mut else_if_expressions = Vec::new();
|
|
let mut else_if_blocks = Vec::new();
|
|
let mut else_block = None;
|
|
|
|
for index in 1..child_count {
|
|
let child = node.child(index).unwrap();
|
|
|
|
if child.kind() == "else_if" {
|
|
let expression_node = child.child(1).unwrap();
|
|
let expression = Expression::from_syntax_node(source, expression_node, context)?;
|
|
|
|
else_if_expressions.push(expression);
|
|
|
|
let block_node = child.child(2).unwrap();
|
|
let block = Block::from_syntax_node(source, block_node, context)?;
|
|
|
|
else_if_blocks.push(block);
|
|
}
|
|
|
|
if child.kind() == "else" {
|
|
let else_node = child.child(1).unwrap();
|
|
else_block = Some(Block::from_syntax_node(source, else_node, context)?);
|
|
}
|
|
}
|
|
|
|
Ok(IfElse {
|
|
if_expression,
|
|
if_block,
|
|
else_if_expressions,
|
|
else_if_blocks,
|
|
else_block,
|
|
})
|
|
}
|
|
|
|
fn run(&self, source: &str, context: &Map) -> Result<Value> {
|
|
let if_boolean = self.if_expression.run(source, context)?.as_boolean()?;
|
|
|
|
if if_boolean {
|
|
self.if_block.run(source, context)
|
|
} else {
|
|
let expressions = &self.else_if_expressions;
|
|
|
|
for (index, expression) in expressions.iter().enumerate() {
|
|
let if_boolean = expression.run(source, context)?.as_boolean()?;
|
|
|
|
if if_boolean {
|
|
let block = self.else_if_blocks.get(index).unwrap();
|
|
|
|
return block.run(source, context);
|
|
}
|
|
}
|
|
|
|
if let Some(block) = &self.else_block {
|
|
block.run(source, context)
|
|
} else {
|
|
Ok(Value::none())
|
|
}
|
|
}
|
|
}
|
|
|
|
fn expected_type(&self, context: &Map) -> Result<Type> {
|
|
self.if_block.expected_type(context)
|
|
}
|
|
}
|
|
|
|
impl Display for IfElse {
|
|
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
|
|
let IfElse {
|
|
if_expression,
|
|
if_block,
|
|
else_if_expressions,
|
|
else_if_blocks,
|
|
else_block,
|
|
} = self;
|
|
|
|
write!(f, "if {if_expression} {{{if_block}}}")?;
|
|
|
|
for (expression, block) in else_if_expressions.iter().zip(else_if_blocks.iter()) {
|
|
write!(f, "else if {expression} {{{block}}}")?;
|
|
}
|
|
|
|
if let Some(block) = else_block {
|
|
write!(f, "else {{{block}}}")?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|