file separation
This commit is contained in:
728
src/instruction.rs
Normal file
728
src/instruction.rs
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@@ -0,0 +1,728 @@
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use super::{util, Context, Value};
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use roxmltree::Node;
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use std::cell::RefCell;
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use std::error::Error;
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use std::rc::Rc;
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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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IntegerCast(Box<Instruction>),
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Float(String),
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FloatCast(Box<Instruction>),
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String(String),
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StringCast(Box<Instruction>),
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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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Equal(Box<Instruction>, Box<Instruction>),
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Greater(Box<Instruction>, Box<Instruction>),
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Lower(Box<Instruction>, 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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}
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impl Instruction {
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pub fn new(node: Node) -> Result<Instruction, Box<dyn Error>> {
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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" => {
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if let Some(v) = node.attribute("value") {
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Instruction::Integer(String::from(v))
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} else if let Some(n) = node.first_element_child() {
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Instruction::IntegerCast(Box::new(Instruction::new(n)?))
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} else {
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Err("missing 'value' attribute or child in 'integer' tag")?
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}
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}
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"float" => {
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if let Some(v) = node.attribute("value") {
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Instruction::Float(String::from(v))
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} else if let Some(n) = node.first_element_child() {
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Instruction::FloatCast(Box::new(Instruction::new(n)?))
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} else {
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Err("missing 'value' attribute or child in 'float' tag")?
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}
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}
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"string" => {
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if let Some(v) = node.attribute("value") {
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Instruction::String(String::from(v))
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} else if let Some(n) = node.first_element_child() {
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Instruction::StringCast(Box::new(Instruction::new(n)?))
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} else {
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Err("missing 'value' attribute or child in 'string' tag")?
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}
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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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"equal" => {
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let children: Vec<Node> = node.children().filter(Node::is_element).collect();
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if children.len() == 2 {
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Instruction::Equal(
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Box::new(Instruction::new(children[0])?),
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Box::new(Instruction::new(children[1])?),
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)
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} else {
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Err("bad child count in 'equal' tag")?
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}
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}
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"greater" => {
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let children: Vec<Node> = node.children().filter(Node::is_element).collect();
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if children.len() == 2 {
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Instruction::Greater(
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Box::new(Instruction::new(children[0])?),
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Box::new(Instruction::new(children[1])?),
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)
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} else {
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Err("bad child count in 'greater' tag")?
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}
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}
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"lower" => {
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let children: Vec<Node> = node.children().filter(Node::is_element).collect();
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if children.len() == 2 {
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Instruction::Lower(
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Box::new(Instruction::new(children[0])?),
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Box::new(Instruction::new(children[1])?),
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)
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} else {
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Err("bad child count in 'lower' tag")?
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}
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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(
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util::find_node(&node, "arguments")
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.ok_or("missing 'arguments' block in 'call' tag")?,
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)?,
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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(
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util::find_node(&node, "arguments")
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.ok_or("missing 'arguments' block in 'call' tag")?,
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)?,
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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(
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util::find_node(&node, "then")
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.ok_or("missing 'then' block in 'if' tag")?,
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)?,
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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(
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util::find_node(&node, "then")
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.ok_or("missing 'then' block in 'if' tag")?,
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)?,
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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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.and_then(|n| n.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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.and_then(|n| n.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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.and_then(|n| n.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(
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util::find_node(&node, "do").ok_or("missing 'do' block in 'for' tag")?,
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)?,
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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(
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util::find_node(&node, "do").ok_or("missing 'do' block in 'each' tag")?,
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)?,
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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(
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util::find_node(&node, "do").ok_or("missing 'do' block in 'while' 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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|
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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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.product::<Result<f64, Box<dyn Error>>>()?,
|
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))
|
||||
} else {
|
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Err("invalid value")?
|
||||
}
|
||||
}
|
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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 {
|
||||
0
|
||||
})
|
||||
}
|
||||
|
||||
fn or(vals: Vec<Value>) -> Value {
|
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Value::Integer(if vals.iter().any(Value::to_bool) {
|
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1
|
||||
} else {
|
||||
0
|
||||
})
|
||||
}
|
||||
|
||||
fn compare(v1: Value, v2: Value) -> Result<i64, Box<dyn Error>> {
|
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use std::cmp::Ordering;
|
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match v1 {
|
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Value::Integer(i1) => match v2 {
|
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Value::Integer(i2) => Ok(i1 - i2),
|
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Value::Float(f2) => Ok(
|
||||
match (i1 as f64)
|
||||
.partial_cmp(&f2)
|
||||
.ok_or("incompatible comparison values")?
|
||||
{
|
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Ordering::Less => -1,
|
||||
Ordering::Equal => 0,
|
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Ordering::Greater => 1,
|
||||
},
|
||||
),
|
||||
_ => Err("incompatible comparison values")?,
|
||||
},
|
||||
Value::Float(f1) => match v2 {
|
||||
Value::Integer(i2) => Ok(
|
||||
match f1
|
||||
.partial_cmp(&(i2 as f64))
|
||||
.ok_or("incompatible comparison values")?
|
||||
{
|
||||
Ordering::Less => -1,
|
||||
Ordering::Equal => 0,
|
||||
Ordering::Greater => 1,
|
||||
},
|
||||
),
|
||||
Value::Float(f2) => Ok(
|
||||
match f1
|
||||
.partial_cmp(&f2)
|
||||
.ok_or("incompatible comparison values")?
|
||||
{
|
||||
Ordering::Less => -1,
|
||||
Ordering::Equal => 0,
|
||||
Ordering::Greater => 1,
|
||||
},
|
||||
),
|
||||
_ => Err("incompatible comparison values")?,
|
||||
},
|
||||
Value::String(s1) => {
|
||||
if let Value::String(s2) = v2 {
|
||||
Ok(match s1.cmp(&s2) {
|
||||
Ordering::Less => -1,
|
||||
Ordering::Equal => 0,
|
||||
Ordering::Greater => 1,
|
||||
})
|
||||
} else {
|
||||
Err("incompatible comparison values")?
|
||||
}
|
||||
}
|
||||
_ => Err("incompatible comparison values")?,
|
||||
}
|
||||
}
|
||||
|
||||
fn run_all(
|
||||
ins: &Vec<Instruction>,
|
||||
ctx: &mut Context,
|
||||
) -> Result<Option<Vec<Value>>, Box<dyn Error>> {
|
||||
ins.iter().map(|i| i.run(ctx)).collect()
|
||||
}
|
||||
|
||||
pub fn run(&self, ctx: &mut Context) -> Result<Option<Value>, Box<dyn Error>> {
|
||||
Ok(if let None = ctx.value(&String::from("__return")) {
|
||||
match self {
|
||||
Instruction::Value(key) => Some(
|
||||
match ctx
|
||||
.value(key)
|
||||
.ok_or(format!("unknown variable '{}'", key))?
|
||||
{
|
||||
Value::Array(vecrc) => Value::Array(Rc::clone(vecrc)),
|
||||
val => val.clone(),
|
||||
},
|
||||
),
|
||||
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::IntegerCast(ins) => Some(Value::Integer(
|
||||
match ins.run(ctx)?.ok_or("no value to be cast to 'integer'")? {
|
||||
Value::Integer(i) => i,
|
||||
Value::Float(f) => f as i64,
|
||||
Value::String(s) => s.parse()?,
|
||||
_ => Err("value cannot be cast to 'integer'")?,
|
||||
},
|
||||
)),
|
||||
Instruction::Float(val) => Some(Value::Float(val.parse()?)),
|
||||
Instruction::FloatCast(ins) => Some(Value::Float(
|
||||
match ins.run(ctx)?.ok_or("no value to be cast to 'float'")? {
|
||||
Value::Integer(i) => i as f64,
|
||||
Value::Float(f) => f,
|
||||
Value::String(s) => s.parse()?,
|
||||
_ => Err("value cannot be cast to 'float'")?,
|
||||
},
|
||||
)),
|
||||
Instruction::String(val) => Some(Value::String(val.clone())),
|
||||
Instruction::StringCast(ins) => Some(Value::String(
|
||||
match ins.run(ctx)?.ok_or("no value to be cast to 'string'")? {
|
||||
Value::Integer(i) => i.to_string(),
|
||||
Value::Float(f) => f.to_string(),
|
||||
Value::String(s) => s,
|
||||
_ => Err("value cannot be cast to 'string'")?,
|
||||
},
|
||||
)),
|
||||
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()
|
||||
{
|
||||
0
|
||||
} else {
|
||||
1
|
||||
},
|
||||
)),
|
||||
Instruction::Equal(v1, v2) => Some(Value::Integer(
|
||||
if Instruction::compare(
|
||||
v1.run(ctx)?.ok_or("invalid child value in 'equal' tag")?,
|
||||
v2.run(ctx)?.ok_or("invalid child value in 'equal' tag")?,
|
||||
)? == 0
|
||||
{
|
||||
1
|
||||
} else {
|
||||
0
|
||||
},
|
||||
)),
|
||||
Instruction::Greater(v1, v2) => Some(Value::Integer(
|
||||
if Instruction::compare(
|
||||
v1.run(ctx)?.ok_or("invalid child value in 'equal' tag")?,
|
||||
v2.run(ctx)?.ok_or("invalid child value in 'equal' tag")?,
|
||||
)? > 0
|
||||
{
|
||||
1
|
||||
} else {
|
||||
0
|
||||
},
|
||||
)),
|
||||
Instruction::Lower(v1, v2) => Some(Value::Integer(
|
||||
if Instruction::compare(
|
||||
v1.run(ctx)?.ok_or("invalid child value in 'equal' tag")?,
|
||||
v2.run(ctx)?.ok_or("invalid child value in 'equal' tag")?,
|
||||
)? < 0
|
||||
{
|
||||
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 if let Value::StdFunction(f) = fct_val {
|
||||
f(vals)?
|
||||
} 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 if let Value::StdFunction(f) = fct_val {
|
||||
f(vals)?
|
||||
} 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
|
||||
}
|
||||
}
|
||||
} else {
|
||||
None
|
||||
})
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user