746 lines
28 KiB
Rust
746 lines
28 KiB
Rust
use roxmltree::{Document, Node};
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::error::Error;
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use std::fs;
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use std::rc::Rc;
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mod util {
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use super::{Error, Node};
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pub fn tag_name(node: &Node) -> String {
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node.tag_name().name().to_lowercase()
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}
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pub fn find_node<'a>(
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node: &'a Node<'a, 'a>,
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tag: &str,
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) -> Result<Node<'a, 'a>, Box<dyn Error>> {
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Ok(node
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.children()
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.find(|n| tag_name(n) == tag)
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.ok_or(format!("node '{}' not found", tag))?)
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}
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}
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#[derive(Clone, Debug)]
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pub enum Instruction {
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Value(String),
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Assign(String, Box<Instruction>),
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Integer(String),
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Float(String),
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String(String),
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Array(Vec<Instruction>),
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Add(Vec<Instruction>),
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Subtract(Vec<Instruction>),
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Multiply(Vec<Instruction>),
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Divide(Vec<Instruction>),
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And(Vec<Instruction>),
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Or(Vec<Instruction>),
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Not(Box<Instruction>),
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Call(Box<Instruction>, Vec<Instruction>),
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CallNamed(String, Vec<Instruction>),
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Return(Box<Instruction>),
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If(Box<Instruction>, Vec<Instruction>),
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IfElse(Box<Instruction>, Vec<Instruction>, Vec<Instruction>),
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For {
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variable: String,
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from: Box<Instruction>,
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to: Box<Instruction>,
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step: Box<Instruction>,
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body: Vec<Instruction>,
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},
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Each(String, Box<Instruction>, Vec<Instruction>),
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While(Box<Instruction>, Vec<Instruction>),
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Print(Box<Instruction>),
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AssignArray(Box<Instruction>, Box<Instruction>, Box<Instruction>),
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InsertArray(Box<Instruction>, Box<Instruction>),
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}
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impl Instruction {
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pub fn new(node: Node) -> Result<Instruction, Box<dyn Error>> {
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// println!("parsing '{}'", util::tag_name(&node));
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Ok(match util::tag_name(&node).as_str() {
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"value" => Instruction::Value(
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node.attribute("variable")
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.and_then(|a| Some(String::from(a)))
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.ok_or("missing 'variable' attribute on 'value' tag")?,
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),
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"assign" => Instruction::Assign(
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String::from(
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node.attribute("variable")
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.ok_or("missing 'variable' attribute on 'assign' tag")?,
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),
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Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing child on 'assign' tag")?,
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)?),
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),
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"integer" => Instruction::Integer(
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node.attribute("value")
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.ok_or("missing 'value' attribute on 'integer' tag")?
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.parse()?,
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),
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"float" => Instruction::Float(
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node.attribute("value")
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.ok_or("missing 'value' attribute on 'float' tag")?
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.parse()?,
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),
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"string" => Instruction::String(String::from(
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node.attribute("value")
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.ok_or("missing 'value' attribute on 'string' tag")?,
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)),
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"array" => Instruction::Array(Instruction::from_children(node)?),
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"add" => Instruction::Add(Instruction::from_children(node)?),
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"subtract" => Instruction::Subtract(Instruction::from_children(node)?),
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"multiply" => Instruction::Multiply(Instruction::from_children(node)?),
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"divide" => Instruction::Divide(Instruction::from_children(node)?),
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"and" => Instruction::And(Instruction::from_children(node)?),
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"or" => Instruction::Or(Instruction::from_children(node)?),
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"not" => Instruction::Not(Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing value child element in 'not' tag")?,
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)?)),
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"call" => {
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if let Some(function) = node.attribute("function") {
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Instruction::CallNamed(
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String::from(function),
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Instruction::from_children(util::find_node(&node, "arguments")?)?,
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)
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} else {
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Instruction::Call(
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Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing function child element in 'call' tag")?,
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)?),
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Instruction::from_children(util::find_node(&node, "arguments")?)?,
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)
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}
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}
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"return" => Instruction::Return(Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing value child element in 'return' tag")?,
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)?)),
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"if" => {
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if let Some(else_node) = node.children().find(|n| util::tag_name(n) == "else") {
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Instruction::IfElse(
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Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing condition child element in 'if' tag")?,
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)?),
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Instruction::from_children(util::find_node(&node, "then")?)?,
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Instruction::from_children(else_node)?,
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)
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} else {
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Instruction::If(
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Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing condition child element in 'if' tag")?,
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)?),
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Instruction::from_children(util::find_node(&node, "then")?)?,
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)
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}
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}
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"for" => Instruction::For {
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variable: String::from(
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node.attribute("variable")
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.ok_or("missing 'variable' attribute on 'for' tag")?,
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),
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from: Box::new(Instruction::new(
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util::find_node(&node, "from")?
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.first_element_child()
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.ok_or("missing 'from' child in 'for' tag")?,
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)?),
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to: Box::new(Instruction::new(
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util::find_node(&node, "to")?
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.first_element_child()
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.ok_or("missing 'to' child in 'for' tag")?,
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)?),
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step: Box::new(Instruction::new(
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util::find_node(&node, "step")?
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.first_element_child()
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.ok_or("missing 'step' child in 'for' tag")?,
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)?),
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body: Instruction::from_children(util::find_node(&node, "do")?)?,
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},
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"each" => Instruction::Each(
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String::from(
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node.attribute("variable")
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.ok_or("missing 'variable' attribute on 'each' tag")?,
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),
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Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing array child element in 'for' tag")?,
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)?),
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Instruction::from_children(util::find_node(&node, "do")?)?,
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),
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"while" => Instruction::While(
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Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing condition child element in 'while' tag")?,
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)?),
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Instruction::from_children(util::find_node(&node, "do")?)?,
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),
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"print" => Instruction::Print(Box::new(Instruction::new(
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node.first_element_child()
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.ok_or("missing value child element in 'print' tag")?,
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)?)),
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"assign-array" => Instruction::AssignArray(
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Box::new(Instruction::new(
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util::find_node(&node, "array")?
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.first_element_child()
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.ok_or("missing 'array' in 'assign-array' tag")?,
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)?),
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Box::new(Instruction::new(
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util::find_node(&node, "index")?
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.first_element_child()
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.ok_or("missing 'index' in 'assign-array' tag")?,
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)?),
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Box::new(Instruction::new(
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util::find_node(&node, "value")?
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.first_element_child()
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.ok_or("missing 'value' in 'assign-array' tag")?,
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)?),
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),
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"insert-array" => Instruction::InsertArray(
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Box::new(Instruction::new(
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util::find_node(&node, "array")?
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.first_element_child()
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.ok_or("missing 'array' in 'insert-array' tag")?,
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)?),
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Box::new(Instruction::new(
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util::find_node(&node, "value")?
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.first_element_child()
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.ok_or("missing 'value' in 'insert-array' tag")?,
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)?),
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),
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tag => Err(format!("unknown tag '{}'", tag))?,
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})
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}
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pub fn from_children(node: Node) -> Result<Vec<Instruction>, Box<dyn Error>> {
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node.children()
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.filter(Node::is_element)
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.map(Instruction::new)
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.collect()
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}
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fn add(vals: Vec<Value>) -> Result<Value, Box<dyn Error>> {
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if vals.iter().all(|v| matches!(v, Value::Integer(_))) {
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Ok(Value::Integer(
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vals.iter()
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.map(|v| {
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if let Value::Integer(i) = v {
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Ok(i)
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} else {
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Err("invalid value")?
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}
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})
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.sum::<Result<i64, Box<dyn Error>>>()?,
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))
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} else if vals
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.iter()
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.all(|v| matches!(v, Value::Integer(_)) || matches!(v, Value::Float(_)))
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{
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Ok(Value::Float(
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vals.iter()
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.map(|v| {
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if let Value::Integer(i) = v {
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Ok(*i as f64)
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} else if let Value::Float(f) = v {
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Ok(*f)
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} else {
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Err("invalid value")?
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}
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})
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.sum::<Result<f64, Box<dyn Error>>>()?,
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))
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} else if vals.iter().all(|v| {
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matches!(v, Value::Integer(_))
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|| matches!(v, Value::Float(_))
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|| matches!(v, Value::String(_))
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}) {
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Ok(Value::String(
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vals.iter()
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.map(|v| {
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Ok(if let Value::String(s) = v {
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s.to_string()
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} else if let Value::Integer(i) = v {
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i.to_string()
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} else if let Value::Float(f) = v {
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f.to_string()
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} else {
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Err("invalid value")?
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})
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})
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.collect::<Result<Vec<String>, Box<dyn Error>>>()?
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.join(""),
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))
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} else {
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Err("invalid value")?
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}
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}
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fn subtract(vals: Vec<Value>) -> Result<Value, Box<dyn Error>> {
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Ok(if vals.iter().all(|v| matches!(v, Value::Integer(_))) {
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let first = match vals.first().ok_or("missing values in 'subtract' tag")? {
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Value::Integer(i) => i,
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_ => Err("invalid value")?,
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};
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Value::Integer(
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*first
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- vals
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.iter()
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.skip(1)
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.map(|v| {
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if let Value::Integer(i) = v {
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Ok(i)
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} else {
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Err("invalid value")?
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}
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})
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.sum::<Result<i64, Box<dyn Error>>>()?,
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)
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} else if vals
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.iter()
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.all(|v| matches!(v, Value::Integer(_)) || matches!(v, Value::Float(_)))
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{
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let first = match vals.first().ok_or("not enough values in 'subtract' tag")? {
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Value::Integer(v) => *v as f64,
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Value::Float(v) => *v,
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_ => Err("invalid value")?,
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};
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Value::Float(
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first
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- vals
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.iter()
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.skip(1)
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.map(|val| {
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Ok(match val {
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Value::Integer(v) => *v as f64,
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Value::Float(v) => *v,
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_ => Err("invalid value")?,
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})
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})
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.sum::<Result<f64, Box<dyn Error>>>()?,
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)
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} else {
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Err("invalid value")?
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})
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}
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fn multiply(vals: Vec<Value>) -> Result<Value, Box<dyn Error>> {
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if vals.iter().all(|v| matches!(v, Value::Integer(_))) {
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Ok(Value::Integer(
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vals.iter()
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.map(|v| {
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if let Value::Integer(i) = v {
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Ok(i)
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} else {
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Err("invalid value")?
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}
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})
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.product::<Result<i64, Box<dyn Error>>>()?,
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))
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} else if vals
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.iter()
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.all(|v| matches!(v, Value::Integer(_)) || matches!(v, Value::Float(_)))
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{
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Ok(Value::Float(
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vals.iter()
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.map(|val| {
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Ok(match val {
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Value::Integer(v) => *v as f64,
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Value::Float(v) => *v,
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_ => Err("invalid value")?,
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})
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})
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.product::<Result<f64, Box<dyn Error>>>()?,
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))
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} else {
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Err("invalid value")?
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}
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}
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fn divide(vals: Vec<Value>) -> Result<Value, Box<dyn Error>> {
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if vals
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.iter()
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.all(|v| matches!(v, Value::Integer(_)) || matches!(v, Value::Float(_)))
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{
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let first = match vals.first().ok_or("not enough values in 'divide' tag")? {
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Value::Integer(v) => *v as f64,
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Value::Float(v) => *v,
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_ => Err("invalid value")?,
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};
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Ok(Value::Float(
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first
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* vals
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.iter()
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.skip(1)
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.map(|val| {
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Ok(match val {
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Value::Integer(v) => 1.0 / (*v as f64),
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Value::Float(v) => 1.0 / *v,
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_ => Err("invalid value")?,
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})
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})
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.product::<Result<f64, Box<dyn Error>>>()?,
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))
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} else {
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Err("invalid value")?
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}
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}
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fn and(vals: Vec<Value>) -> Value {
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Value::Integer(if vals.iter().all(Value::to_bool) {
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1
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} else {
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0
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})
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}
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fn or(vals: Vec<Value>) -> Value {
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Value::Integer(if vals.iter().any(Value::to_bool) {
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1
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} else {
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0
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})
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}
|
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fn run_all(
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ins: &Vec<Instruction>,
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ctx: &mut Context,
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) -> Result<Option<Vec<Value>>, Box<dyn Error>> {
|
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ins.iter().map(|i| i.run(ctx)).collect()
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}
|
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|
|
pub fn run(&self, ctx: &mut Context) -> Result<Option<Value>, Box<dyn Error>> {
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Ok(if let None = ctx.value(&String::from("__return")) {
|
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match self {
|
|
Instruction::Value(key) => {
|
|
Some(match ctx.value(key).ok_or("unknown variable")? {
|
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Value::Array(vecrc) => Value::Array(Rc::clone(vecrc)),
|
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val => val.clone(),
|
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})
|
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}
|
|
Instruction::Assign(key, ins) => {
|
|
let v = ins.run(ctx)?.ok_or("invalid child value in 'assign' tag")?;
|
|
ctx.assign(key.clone(), v);
|
|
None
|
|
}
|
|
Instruction::Integer(val) => Some(Value::Integer(val.parse()?)),
|
|
Instruction::Float(val) => Some(Value::Float(val.parse()?)),
|
|
Instruction::String(val) => Some(Value::String(val.clone())),
|
|
Instruction::Array(args) => Some(Value::Array(Rc::new(RefCell::new(
|
|
Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid child values in 'array' tag")?,
|
|
)))),
|
|
Instruction::Add(args) => {
|
|
let vals = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid child values in 'add' tag")?;
|
|
Some(Instruction::add(vals)?)
|
|
}
|
|
Instruction::Subtract(args) => {
|
|
let vals = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid child values in 'subtract' tag")?;
|
|
Some(Instruction::subtract(vals)?)
|
|
}
|
|
Instruction::Multiply(args) => {
|
|
let vals = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid child values in 'multiply' tag")?;
|
|
Some(Instruction::multiply(vals)?)
|
|
}
|
|
Instruction::Divide(args) => {
|
|
let vals = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid child values in 'divide' tag")?;
|
|
Some(Instruction::divide(vals)?)
|
|
}
|
|
Instruction::And(args) => {
|
|
let vals = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid child values in 'and' tag")?;
|
|
Some(Instruction::and(vals))
|
|
}
|
|
Instruction::Or(args) => {
|
|
let vals = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid child values in 'or' tag")?;
|
|
Some(Instruction::or(vals))
|
|
}
|
|
Instruction::Not(arg) => Some(Value::Integer(
|
|
if arg
|
|
.run(ctx)?
|
|
.ok_or("invalid child value in 'not' tag")?
|
|
.to_bool()
|
|
{
|
|
1
|
|
} else {
|
|
0
|
|
},
|
|
)),
|
|
Instruction::Call(fct_ins, args) => {
|
|
let vals = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid argument values in 'call' tag")?;
|
|
let fct_val = fct_ins
|
|
.run(ctx)?
|
|
.ok_or("invalid child function in 'call' tag")?;
|
|
if let Value::Function(f) = fct_val {
|
|
f.run(vals, ctx)?
|
|
} else {
|
|
Err("invalid function")?
|
|
}
|
|
}
|
|
Instruction::CallNamed(fct_name, args) => {
|
|
let vals: Vec<Value> = Instruction::run_all(args, ctx)?
|
|
.ok_or("invalid argument values in 'or' tag")?;
|
|
let fct_val = ctx.value(&fct_name).ok_or("unknown function")?;
|
|
if let Value::Function(f) = fct_val {
|
|
let mut local = ctx.clone();
|
|
f.run(vals, &mut local)?
|
|
} else {
|
|
Err("invalid function")?
|
|
}
|
|
}
|
|
Instruction::Return(ins) => {
|
|
let v = ins.run(ctx)?.ok_or("invalid child value in 'return' tag")?;
|
|
ctx.assign(String::from("__return"), v);
|
|
None
|
|
}
|
|
Instruction::If(cond, then) => {
|
|
if cond
|
|
.run(ctx)?
|
|
.ok_or("invalid condition value in 'if' tag")?
|
|
.to_bool()
|
|
{
|
|
for i in then {
|
|
i.run(ctx)?;
|
|
}
|
|
}
|
|
None
|
|
}
|
|
Instruction::IfElse(cond, then, els) => {
|
|
if cond
|
|
.run(ctx)?
|
|
.ok_or("invalid condition value in 'if' tag")?
|
|
.to_bool()
|
|
{
|
|
for i in then {
|
|
i.run(ctx)?;
|
|
}
|
|
} else {
|
|
for i in els {
|
|
i.run(ctx)?;
|
|
}
|
|
}
|
|
None
|
|
}
|
|
Instruction::For {
|
|
variable,
|
|
from,
|
|
to,
|
|
step,
|
|
body,
|
|
} => {
|
|
if let Value::Integer(f) =
|
|
from.run(ctx)?.ok_or("invalid 'from' value in 'for' tag")?
|
|
{
|
|
if let Value::Integer(t) =
|
|
to.run(ctx)?.ok_or("invalid 'to' value in 'for' tag")?
|
|
{
|
|
if let Value::Integer(s) =
|
|
step.run(ctx)?.ok_or("invalid 'from' value in 'for' tag")?
|
|
{
|
|
for i in (f..t).step_by(s.try_into()?) {
|
|
ctx.assign(variable.clone(), Value::Integer(i));
|
|
for ins in body {
|
|
ins.run(ctx)?;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
None
|
|
}
|
|
Instruction::Each(variable, array_ins, body) => {
|
|
if let Value::Array(v) = array_ins
|
|
.run(ctx)?
|
|
.ok_or("invalid array value in 'each' tag")?
|
|
{
|
|
for i in v.borrow().iter() {
|
|
ctx.assign(variable.clone(), i.clone());
|
|
for ins in body {
|
|
ins.run(ctx)?;
|
|
}
|
|
}
|
|
} else {
|
|
Err("invalid array")?
|
|
}
|
|
None
|
|
}
|
|
Instruction::While(cond, body) => {
|
|
while cond
|
|
.run(ctx)?
|
|
.ok_or("invalid condition value in 'while' tag")?
|
|
.to_bool()
|
|
{
|
|
for ins in body {
|
|
ins.run(ctx)?;
|
|
}
|
|
}
|
|
None
|
|
}
|
|
Instruction::Print(ins) => {
|
|
match ins.run(ctx)?.ok_or("invalid child value in 'print' tag")? {
|
|
Value::Integer(i) => println!("{}", i),
|
|
Value::Float(f) => println!("{}", f),
|
|
Value::String(s) => println!("{}", s),
|
|
_ => Err("Unprintable value")?,
|
|
};
|
|
None
|
|
}
|
|
Instruction::AssignArray(array_ins, index_ins, value_ins) => {
|
|
if let Some(Value::Array(vec)) = array_ins.run(ctx)? {
|
|
if let Some(Value::Integer(index)) = index_ins.run(ctx)? {
|
|
vec.borrow_mut().insert(
|
|
index.try_into()?,
|
|
value_ins
|
|
.run(ctx)?
|
|
.ok_or("invalid 'value' value in 'assign-array' tag")?,
|
|
);
|
|
}
|
|
}
|
|
None
|
|
}
|
|
Instruction::InsertArray(array_ins, value_ins) => {
|
|
if let Some(Value::Array(vec)) = array_ins.run(ctx)? {
|
|
vec.borrow_mut().push(
|
|
value_ins
|
|
.run(ctx)?
|
|
.ok_or("invalid 'value' value in 'insert-array' tag")?,
|
|
);
|
|
}
|
|
None
|
|
}
|
|
}
|
|
} else {
|
|
None
|
|
})
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Debug)]
|
|
pub struct Function {
|
|
args: Vec<String>,
|
|
ins: Vec<Instruction>,
|
|
}
|
|
|
|
impl Function {
|
|
pub fn run(
|
|
&self,
|
|
args: Vec<Value>,
|
|
ctx: &mut Context,
|
|
) -> Result<Option<Value>, Box<dyn Error>> {
|
|
if args.len() != self.args.len() {
|
|
Err("not enough arguments")?;
|
|
}
|
|
self.args
|
|
.iter()
|
|
.zip(args.into_iter())
|
|
.for_each(|(p, a)| ctx.assign(p.clone(), a));
|
|
for i in self.ins.iter() {
|
|
i.run(ctx)?;
|
|
}
|
|
Ok(ctx.take(&String::from("__return")))
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Debug)]
|
|
pub enum Value {
|
|
Integer(i64),
|
|
Float(f64),
|
|
String(String),
|
|
Array(Rc<RefCell<Vec<Value>>>),
|
|
Function(Function),
|
|
}
|
|
|
|
impl Value {
|
|
fn to_bool(&self) -> bool {
|
|
match self {
|
|
Value::Integer(i) => *i != 0,
|
|
Value::Float(f) => *f != 0.0,
|
|
Value::String(s) => s.len() != 0,
|
|
Value::Array(v) => v.borrow().len() != 0,
|
|
_ => true,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
pub struct Context {
|
|
dict: HashMap<String, Value>,
|
|
parent: Option<Box<Context>>,
|
|
}
|
|
|
|
impl Context {
|
|
pub fn new(parent: Option<Box<Context>>) -> Context {
|
|
Context {
|
|
dict: HashMap::new(),
|
|
parent,
|
|
}
|
|
}
|
|
|
|
pub fn assign(&mut self, key: String, value: Value) {
|
|
self.dict.insert(key, value);
|
|
}
|
|
|
|
pub fn value(&self, key: &String) -> Option<&Value> {
|
|
self.dict
|
|
.get(key)
|
|
.or(self.parent.as_ref().and_then(|p| p.value(key)))
|
|
}
|
|
|
|
pub fn take(&mut self, key: &String) -> Option<Value> {
|
|
self.dict.remove(key)
|
|
}
|
|
}
|
|
|
|
pub fn run(filename: &str) -> Result<(), Box<dyn Error>> {
|
|
let contents = fs::read_to_string(filename)?;
|
|
let doc = Document::parse(&contents)?;
|
|
let root = doc.root();
|
|
|
|
let mut ctx = Context::new(None);
|
|
|
|
let main = root
|
|
.first_element_child()
|
|
.ok_or("invalid program structure")?
|
|
.children()
|
|
.find(|node| util::tag_name(&node) == "main")
|
|
.ok_or("No 'main' block")?;
|
|
let main_ast = Instruction::from_children(main)?;
|
|
|
|
let functions = root
|
|
.first_element_child()
|
|
.ok_or("invalid program structure")?
|
|
.children()
|
|
.filter(|node| node.tag_name().name() == String::from("function"));
|
|
|
|
for fun in functions {
|
|
ctx.assign(
|
|
String::from(fun.attribute("name").ok_or("unnamed function")?),
|
|
Value::Function(Function {
|
|
args: util::find_node(&fun, "arguments")?
|
|
.children()
|
|
.filter(Node::is_element)
|
|
.map(|n| n.attribute("name").and_then(|s| Some(String::from(s))))
|
|
.collect::<Option<Vec<String>>>()
|
|
.ok_or("unnamed argument")?,
|
|
ins: Instruction::from_children(util::find_node(&fun, "body")?)?,
|
|
}),
|
|
);
|
|
}
|
|
|
|
for ins in main_ast {
|
|
ins.run(&mut ctx)?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|