263 lines
9.3 KiB
Rust
263 lines
9.3 KiB
Rust
use serde::{Deserialize, Serialize};
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use crate::{
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error::{RuntimeError, ValidationError},
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identifier::Identifier,
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value::ValueInner,
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Context, Value,
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};
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use super::{
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type_constructor::TypeInvokationConstructor, AbstractNode, Evaluation, Expression, Statement,
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Type, TypeConstructor, WithPosition,
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};
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#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord, Serialize, Deserialize)]
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pub struct Assignment {
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identifier: WithPosition<Identifier>,
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constructor: Option<TypeConstructor>,
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operator: AssignmentOperator,
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statement: Box<Statement>,
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}
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#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord, Serialize, Deserialize)]
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pub enum AssignmentOperator {
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Assign,
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AddAssign,
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SubAssign,
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}
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impl Assignment {
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pub fn new(
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identifier: WithPosition<Identifier>,
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constructor: Option<TypeConstructor>,
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operator: AssignmentOperator,
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statement: Statement,
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) -> Self {
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Self {
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identifier,
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constructor,
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operator,
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statement: Box::new(statement),
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}
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}
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}
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impl AbstractNode for Assignment {
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fn define_types(&self, context: &Context) -> Result<(), ValidationError> {
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self.statement.define_types(context)?;
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let relevant_statement = self.statement.last_evaluated_statement();
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let statement_type = if let Some(r#type) = relevant_statement.expected_type(context)? {
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r#type
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} else {
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return Err(ValidationError::CannotAssignToNone(
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self.statement.position(),
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));
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};
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if let Some(constructor) = &self.constructor {
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let r#type = constructor.clone().construct(&context)?;
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r#type
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.check(&statement_type)
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.map_err(|conflict| ValidationError::TypeCheck {
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conflict,
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actual_position: self.statement.position(),
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expected_position: Some(constructor.position()),
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})?;
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context.set_type(self.identifier.node.clone(), r#type.clone())?;
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} else {
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context.set_type(self.identifier.node.clone(), statement_type.clone())?;
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}
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if let (Some(constructor), Statement::Expression(Expression::FunctionCall(function_call))) =
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(&self.constructor, relevant_statement)
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{
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let declared_type = constructor.clone().construct(context)?;
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let function_type = function_call
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.node
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.function_expression()
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.expected_type(context)?;
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if let Some(Type::Function {
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return_type,
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type_parameters: Some(type_parameters),
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..
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}) = function_type
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{
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if let Some(Type::Generic { identifier, .. }) = return_type.map(|r#box| *r#box) {
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let returned_parameter = type_parameters
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.into_iter()
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.find(|parameter| parameter == &identifier);
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if let Some(parameter) = returned_parameter {
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context.set_type(parameter, declared_type)?;
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return Ok(());
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}
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}
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} else {
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return Err(ValidationError::ExpectedFunction {
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actual: function_type.unwrap(),
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position: function_call.position,
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});
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}
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}
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Ok(())
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}
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fn validate(&self, context: &Context, manage_memory: bool) -> Result<(), ValidationError> {
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let relevant_statement = self.statement.last_evaluated_statement();
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let statement_type = if let Some(r#type) = relevant_statement.expected_type(context)? {
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r#type
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} else {
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return Err(ValidationError::CannotAssignToNone(
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relevant_statement.position(),
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));
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};
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self.statement.validate(context, manage_memory)?;
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if let (
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Some(TypeConstructor::Invokation(TypeInvokationConstructor {
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identifier,
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type_arguments,
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})),
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Type::Enum {
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type_parameters, ..
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},
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) = (&self.constructor, &statement_type)
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{
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if let (Some(parameters), Some(arguments)) = (type_parameters, type_arguments) {
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if parameters.len() != arguments.len() {
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return Err(ValidationError::FullTypeNotKnown {
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identifier: identifier.node.clone(),
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position: self.constructor.clone().unwrap().position(),
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});
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}
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}
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return Ok(());
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}
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Ok(())
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}
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fn evaluate(
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self,
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context: &Context,
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manage_memory: bool,
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) -> Result<Option<Evaluation>, RuntimeError> {
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let evaluation = self.statement.evaluate(context, manage_memory)?;
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let right = match evaluation {
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Some(Evaluation::Return(value)) => value,
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evaluation => return Ok(evaluation),
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};
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match self.operator {
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AssignmentOperator::Assign => {
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context.set_value(self.identifier.node, right)?;
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}
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AssignmentOperator::AddAssign => {
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let left_option = if manage_memory {
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context.use_value(&self.identifier.node)?
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} else {
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context.get_value(&self.identifier.node)?
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};
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if let Some(left) = left_option {
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let new_value = match (left.inner().as_ref(), right.inner().as_ref()) {
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(ValueInner::Integer(left), ValueInner::Integer(right)) => {
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let sum = left.saturating_add(*right);
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Value::integer(sum)
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}
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(ValueInner::Float(left), ValueInner::Float(right)) => {
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let sum = left + right;
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Value::float(sum)
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}
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(ValueInner::Float(left), ValueInner::Integer(right)) => {
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let sum = left + *right as f64;
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Value::float(sum)
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}
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(ValueInner::Integer(left), ValueInner::Float(right)) => {
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let sum = *left as f64 + right;
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Value::float(sum)
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}
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_ => {
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return Err(RuntimeError::ValidationFailure(
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ValidationError::ExpectedIntegerOrFloat(self.identifier.position),
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))
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}
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};
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context.set_value(self.identifier.node, new_value)?;
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} else {
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return Err(RuntimeError::ValidationFailure(
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ValidationError::VariableNotFound {
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identifier: self.identifier.node,
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position: self.identifier.position,
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},
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));
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}
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}
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AssignmentOperator::SubAssign => {
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let left_option = if manage_memory {
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context.use_value(&self.identifier.node)?
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} else {
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context.get_value(&self.identifier.node)?
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};
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if let Some(left) = left_option {
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let new_value = match (left.inner().as_ref(), right.inner().as_ref()) {
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(ValueInner::Integer(left), ValueInner::Integer(right)) => {
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let difference = left.saturating_sub(*right);
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Value::integer(difference)
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}
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(ValueInner::Float(left), ValueInner::Float(right)) => {
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let difference = left - right;
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Value::float(difference)
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}
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(ValueInner::Float(left), ValueInner::Integer(right)) => {
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let difference = left - *right as f64;
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Value::float(difference)
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}
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(ValueInner::Integer(left), ValueInner::Float(right)) => {
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let difference = *left as f64 - right;
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Value::float(difference)
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}
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_ => {
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return Err(RuntimeError::ValidationFailure(
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ValidationError::ExpectedIntegerOrFloat(self.identifier.position),
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))
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}
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};
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context.set_value(self.identifier.node, new_value)?;
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} else {
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return Err(RuntimeError::ValidationFailure(
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ValidationError::VariableNotFound {
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identifier: self.identifier.node,
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position: self.identifier.position,
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},
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));
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}
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}
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}
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Ok(None)
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}
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fn expected_type(&self, _: &Context) -> Result<Option<Type>, ValidationError> {
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Ok(None)
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}
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}
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