817 lines
29 KiB
Rust
817 lines
29 KiB
Rust
//! Tools for analyzing an abstract syntax tree and catching errors before running the virtual
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//! machine.
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//!
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//! This module provides two anlysis options:
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//! - `analyze` convenience function, which takes a string input
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//! - `Analyzer` struct, which borrows an abstract syntax tree and a context
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use std::{
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error::Error,
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fmt::{self, Display, Formatter},
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};
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use crate::{
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abstract_tree::{BinaryOperator, UnaryOperator},
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parse, AbstractSyntaxTree, Context, DustError, Identifier, Node, Span, Statement, Type,
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};
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/// Analyzes the abstract syntax tree for errors.
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///
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/// # Examples
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/// ```
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/// # use std::collections::HashMap;
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/// # use dust_lang::*;
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/// let input = "x = 1 + false";
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/// let result = analyze(input);
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///
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/// assert!(result.is_err());
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/// ```
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pub fn analyze(source: &str) -> Result<(), DustError> {
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let abstract_tree = parse(source)?;
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let context = Context::new();
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let mut analyzer = Analyzer::new(&abstract_tree, &context);
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analyzer
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.analyze()
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.map_err(|analyzer_error| DustError::AnalyzerError {
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analyzer_error,
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source,
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})
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}
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/// Static analyzer that checks for potential runtime errors.
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///
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/// # Examples
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/// ```
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/// # use std::collections::HashMap;
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/// # use dust_lang::*;
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/// let input = "x = 1 + false";
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/// let abstract_tree = parse(input).unwrap();
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/// let mut context = Context::new();
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/// let mut analyzer = Analyzer::new(&abstract_tree, &mut context);
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/// let result = analyzer.analyze();
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///
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/// assert!(result.is_err());
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pub struct Analyzer<'a> {
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abstract_tree: &'a AbstractSyntaxTree,
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context: &'a Context,
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}
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impl<'a> Analyzer<'a> {
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pub fn new(abstract_tree: &'a AbstractSyntaxTree, context: &'a Context) -> Self {
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Self {
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abstract_tree,
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context,
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}
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}
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pub fn analyze(&mut self) -> Result<(), AnalyzerError> {
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for node in &self.abstract_tree.nodes {
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self.analyze_statement(node)?;
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}
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Ok(())
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}
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fn analyze_statement(&mut self, node: &Node<Statement>) -> Result<(), AnalyzerError> {
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match &node.inner {
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Statement::BinaryOperation {
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left,
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operator,
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right,
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} => {
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if let BinaryOperator::Assign | BinaryOperator::AddAssign = operator.inner {
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self.analyze_statement(right)?;
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if let Statement::Identifier(identifier) = &left.inner {
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let right_type = right.inner.expected_type(self.context).ok_or(
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AnalyzerError::ExpectedValue {
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actual: right.as_ref().clone(),
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},
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)?;
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self.context
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.set_type(identifier.clone(), right_type, left.position);
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return Ok(());
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}
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}
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if let BinaryOperator::FieldAccess = operator.inner {
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self.analyze_statement(left)?;
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if let Statement::Identifier(_) = right.inner {
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// Do not expect a value for property accessors
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} else {
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self.analyze_statement(right)?;
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}
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let left_type = left.inner.expected_type(self.context);
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let right_type = right.inner.expected_type(self.context);
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if let Some(Type::Map { .. }) = left_type {
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if let Some(Type::String) = right_type {
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// Allow indexing maps with strings
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} else if let Statement::Identifier(_) = right.inner {
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// Allow indexing maps with identifiers
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} else {
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return Err(AnalyzerError::ExpectedIdentifierOrString {
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actual: right.as_ref().clone(),
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});
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}
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} else {
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return Err(AnalyzerError::ExpectedMap {
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actual: left.as_ref().clone(),
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});
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}
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// If the accessor is an identifier, check if it is a valid field
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if let Statement::Identifier(identifier) = &right.inner {
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if let Some(Type::Map(fields)) = &left_type {
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if !fields.contains_key(identifier) {
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return Err(AnalyzerError::UndefinedField {
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identifier: right.as_ref().clone(),
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map: left.as_ref().clone(),
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});
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}
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}
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}
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// If the accessor is a constant, check if it is a valid field
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if let Statement::Constant(value) = &right.inner {
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if let Some(field_name) = value.as_string() {
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if let Some(Type::Map(fields)) = left_type {
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if !fields.contains_key(&Identifier::new(field_name)) {
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return Err(AnalyzerError::UndefinedField {
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identifier: right.as_ref().clone(),
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map: left.as_ref().clone(),
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});
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}
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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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if let BinaryOperator::ListIndex = operator.inner {
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self.analyze_statement(left)?;
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self.analyze_statement(right)?;
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if let Some(Type::List { length, .. }) = left.inner.expected_type(self.context)
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{
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let index_type = right.inner.expected_type(self.context);
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if let Some(Type::Integer | Type::Range) = index_type {
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// List and index are valid
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} else {
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return Err(AnalyzerError::ExpectedIntegerOrRange {
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actual: right.as_ref().clone(),
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});
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}
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// If the index is a constant, check if it is out of bounds
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if let Statement::Constant(value) = &right.inner {
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if let Some(index_value) = value.as_integer() {
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let index_value = index_value as usize;
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if index_value >= length {
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return Err(AnalyzerError::IndexOutOfBounds {
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list: left.as_ref().clone(),
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index: right.as_ref().clone(),
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index_value,
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length,
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});
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}
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}
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}
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} else {
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return Err(AnalyzerError::ExpectedList {
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actual: left.as_ref().clone(),
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});
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}
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return Ok(());
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}
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self.analyze_statement(left)?;
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self.analyze_statement(right)?;
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let left_type = left.inner.expected_type(self.context);
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let right_type = right.inner.expected_type(self.context);
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if let BinaryOperator::Add
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| BinaryOperator::Subtract
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| BinaryOperator::Multiply
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| BinaryOperator::Divide
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| BinaryOperator::Greater
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| BinaryOperator::GreaterOrEqual
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| BinaryOperator::Less
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| BinaryOperator::LessOrEqual = operator.inner
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{
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if let Some(expected_type) = left_type {
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if let Some(actual_type) = right_type {
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expected_type.check(&actual_type).map_err(|conflict| {
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AnalyzerError::TypeConflict {
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actual_statement: right.as_ref().clone(),
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actual_type: conflict.actual,
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expected: conflict.expected,
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}
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})?;
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} else {
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return Err(AnalyzerError::ExpectedValue {
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actual: right.as_ref().clone(),
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});
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}
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} else {
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return Err(AnalyzerError::ExpectedValue {
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actual: left.as_ref().clone(),
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});
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}
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}
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}
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Statement::Block(statements) => {
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for statement in statements {
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self.analyze_statement(statement)?;
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}
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}
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Statement::BuiltInFunctionCall {
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function,
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value_arguments,
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..
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} => {
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let value_parameters = function.value_parameters();
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if let Some(arguments) = value_arguments {
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for argument in arguments {
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self.analyze_statement(argument)?;
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}
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if arguments.len() != value_parameters.len() {
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return Err(AnalyzerError::ExpectedValueArgumentCount {
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expected: value_parameters.len(),
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actual: arguments.len(),
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position: node.position,
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});
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}
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for ((_identifier, parameter_type), argument) in
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value_parameters.iter().zip(arguments)
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{
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let argument_type_option = argument.inner.expected_type(self.context);
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if let Some(argument_type) = argument_type_option {
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parameter_type.check(&argument_type).map_err(|conflict| {
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AnalyzerError::TypeConflict {
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actual_statement: argument.clone(),
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actual_type: conflict.actual,
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expected: parameter_type.clone(),
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}
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})?;
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} else {
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return Err(AnalyzerError::ExpectedValue {
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actual: argument.clone(),
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});
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}
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}
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if arguments.is_empty() && !value_parameters.is_empty() {
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return Err(AnalyzerError::ExpectedValueArgumentCount {
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expected: value_parameters.len(),
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actual: 0,
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position: node.position,
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});
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}
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} else if !value_parameters.is_empty() {
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return Err(AnalyzerError::ExpectedValueArgumentCount {
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expected: value_parameters.len(),
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actual: 0,
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position: node.position,
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});
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}
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}
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Statement::Constant(_) => {}
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Statement::FunctionCall {
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function,
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value_arguments,
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..
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} => {
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self.analyze_statement(function)?;
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if let Some(arguments) = value_arguments {
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for argument in arguments {
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self.analyze_statement(argument)?;
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}
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}
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}
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Statement::Identifier(identifier) => {
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let exists = self.context.update_last_position(identifier, node.position);
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if !exists {
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return Err(AnalyzerError::UndefinedVariable {
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identifier: node.clone(),
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});
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}
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}
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Statement::If { condition, body } => {
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self.analyze_statement(condition)?;
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if let Some(Type::Boolean) = condition.inner.expected_type(self.context) {
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// Condition is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: condition.as_ref().clone(),
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});
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}
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self.analyze_statement(body)?;
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}
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Statement::IfElse {
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condition,
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if_body,
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else_body,
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} => {
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self.analyze_statement(condition)?;
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if let Some(Type::Boolean) = condition.inner.expected_type(self.context) {
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// Condition is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: condition.as_ref().clone(),
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});
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}
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self.analyze_statement(if_body)?;
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self.analyze_statement(else_body)?;
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}
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Statement::IfElseIf {
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condition,
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if_body,
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else_ifs,
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} => {
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self.analyze_statement(condition)?;
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if let Some(Type::Boolean) = condition.inner.expected_type(self.context) {
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// Condition is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: condition.as_ref().clone(),
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});
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}
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self.analyze_statement(if_body)?;
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for (condition, body) in else_ifs {
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self.analyze_statement(condition)?;
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if let Some(Type::Boolean) = condition.inner.expected_type(self.context) {
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// Condition is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: condition.clone(),
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});
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}
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self.analyze_statement(body)?;
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}
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}
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Statement::IfElseIfElse {
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condition,
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if_body,
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else_ifs,
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else_body,
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} => {
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self.analyze_statement(condition)?;
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if let Some(Type::Boolean) = condition.inner.expected_type(self.context) {
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// Condition is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: condition.as_ref().clone(),
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});
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}
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self.analyze_statement(if_body)?;
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for (condition, body) in else_ifs {
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self.analyze_statement(condition)?;
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if let Some(Type::Boolean) = condition.inner.expected_type(self.context) {
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// Condition is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: condition.clone(),
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});
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}
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self.analyze_statement(body)?;
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}
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self.analyze_statement(else_body)?;
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}
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Statement::List(statements) => {
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for statement in statements {
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self.analyze_statement(statement)?;
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}
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}
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Statement::Map(properties) => {
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for (_key, value_node) in properties {
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self.analyze_statement(value_node)?;
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}
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}
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Statement::Nil(node) => {
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self.analyze_statement(node)?;
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}
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Statement::UnaryOperation { operator, operand } => {
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self.analyze_statement(operand)?;
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if let UnaryOperator::Negate = operator.inner {
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if let Some(Type::Integer | Type::Float | Type::Number) =
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operand.inner.expected_type(self.context)
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{
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// Operand is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: operand.as_ref().clone(),
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});
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}
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}
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if let UnaryOperator::Not = operator.inner {
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if let Some(Type::Boolean) = operand.inner.expected_type(self.context) {
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// Operand is valid
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: operand.as_ref().clone(),
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});
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}
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}
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}
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Statement::While { condition, body } => {
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self.analyze_statement(condition)?;
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self.analyze_statement(body)?;
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if let Some(Type::Boolean) = condition.inner.expected_type(self.context) {
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} else {
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return Err(AnalyzerError::ExpectedBoolean {
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actual: condition.as_ref().clone(),
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});
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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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}
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#[derive(Clone, Debug, PartialEq)]
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pub enum AnalyzerError {
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ExpectedBoolean {
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actual: Node<Statement>,
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},
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ExpectedIdentifier {
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actual: Node<Statement>,
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},
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ExpectedIdentifierOrString {
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actual: Node<Statement>,
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},
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ExpectedIntegerOrRange {
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actual: Node<Statement>,
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},
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ExpectedList {
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actual: Node<Statement>,
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},
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ExpectedMap {
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actual: Node<Statement>,
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},
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ExpectedValue {
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actual: Node<Statement>,
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},
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ExpectedValueArgumentCount {
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expected: usize,
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actual: usize,
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position: Span,
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},
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IndexOutOfBounds {
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list: Node<Statement>,
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index: Node<Statement>,
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index_value: usize,
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length: usize,
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},
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TypeConflict {
|
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actual_statement: Node<Statement>,
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actual_type: Type,
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expected: Type,
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},
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UndefinedVariable {
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identifier: Node<Statement>,
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},
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UndefinedField {
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identifier: Node<Statement>,
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map: Node<Statement>,
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},
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UnexpectedIdentifier {
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identifier: Node<Statement>,
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},
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UnexectedString {
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actual: Node<Statement>,
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},
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}
|
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|
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impl AnalyzerError {
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pub fn position(&self) -> Span {
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match self {
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AnalyzerError::ExpectedBoolean { actual, .. } => actual.position,
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AnalyzerError::ExpectedIdentifier { actual, .. } => actual.position,
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AnalyzerError::ExpectedIdentifierOrString { actual } => actual.position,
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AnalyzerError::ExpectedIntegerOrRange { actual, .. } => actual.position,
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AnalyzerError::ExpectedList { actual } => actual.position,
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AnalyzerError::ExpectedMap { actual } => actual.position,
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AnalyzerError::ExpectedValue { actual } => actual.position,
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AnalyzerError::ExpectedValueArgumentCount { position, .. } => *position,
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AnalyzerError::IndexOutOfBounds { list, index, .. } => {
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(list.position.0, index.position.1)
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}
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AnalyzerError::TypeConflict {
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actual_statement, ..
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} => actual_statement.position,
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AnalyzerError::UndefinedField { identifier, .. } => identifier.position,
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AnalyzerError::UndefinedVariable { identifier } => identifier.position,
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AnalyzerError::UnexpectedIdentifier { identifier } => identifier.position,
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AnalyzerError::UnexectedString { actual } => actual.position,
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}
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}
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}
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impl Error for AnalyzerError {}
|
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|
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impl Display for AnalyzerError {
|
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
|
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match self {
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AnalyzerError::ExpectedBoolean { actual, .. } => {
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write!(f, "Expected boolean, found {}", actual)
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}
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AnalyzerError::ExpectedIdentifier { actual, .. } => {
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write!(f, "Expected identifier, found {}", actual)
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}
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AnalyzerError::ExpectedIdentifierOrString { actual } => {
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write!(f, "Expected identifier or string, found {}", actual)
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}
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AnalyzerError::ExpectedIntegerOrRange { actual, .. } => {
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write!(f, "Expected integer or range, found {}", actual)
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}
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AnalyzerError::ExpectedList { actual } => write!(f, "Expected list, found {}", actual),
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AnalyzerError::ExpectedMap { actual } => write!(f, "Expected map, found {}", actual),
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AnalyzerError::ExpectedValue { actual, .. } => {
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write!(f, "Expected value, found {}", actual)
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}
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AnalyzerError::ExpectedValueArgumentCount {
|
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expected, actual, ..
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} => write!(f, "Expected {} value arguments, found {}", expected, actual),
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AnalyzerError::IndexOutOfBounds {
|
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list,
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index_value,
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length,
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..
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} => write!(
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f,
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"Index {} out of bounds for list {} with length {}",
|
|
index_value, list, length
|
|
),
|
|
AnalyzerError::TypeConflict {
|
|
actual_statement,
|
|
actual_type,
|
|
expected,
|
|
} => {
|
|
write!(
|
|
f,
|
|
"Expected type {}, found {}, which has type {}",
|
|
expected, actual_statement, actual_type
|
|
)
|
|
}
|
|
AnalyzerError::UndefinedField { identifier, map } => {
|
|
write!(f, "Undefined field {} in map {}", identifier, map)
|
|
}
|
|
AnalyzerError::UndefinedVariable { identifier } => {
|
|
write!(f, "Undefined variable {}", identifier)
|
|
}
|
|
AnalyzerError::UnexpectedIdentifier { identifier, .. } => {
|
|
write!(f, "Unexpected identifier {}", identifier)
|
|
}
|
|
AnalyzerError::UnexectedString { actual, .. } => {
|
|
write!(f, "Unexpected string {}", actual)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use crate::{Identifier, Value};
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn constant_list_index_out_of_bounds() {
|
|
let source = "[1, 2, 3][3]";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::IndexOutOfBounds {
|
|
list: Node::new(
|
|
Statement::List(vec![
|
|
Node::new(Statement::Constant(Value::integer(1)), (1, 2)),
|
|
Node::new(Statement::Constant(Value::integer(2)), (4, 5)),
|
|
Node::new(Statement::Constant(Value::integer(3)), (7, 8)),
|
|
]),
|
|
(0, 9)
|
|
),
|
|
index: Node::new(Statement::Constant(Value::integer(3)), (10, 11)),
|
|
index_value: 3,
|
|
length: 3
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn nonexistant_field_identifier() {
|
|
let source = "{ x = 1 }.y";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::UndefinedField {
|
|
identifier: Node::new(Statement::Identifier(Identifier::new("y")), (10, 11)),
|
|
map: Node::new(
|
|
Statement::Map(vec![(
|
|
Node::new(Statement::Identifier(Identifier::new("x")), (2, 3)),
|
|
Node::new(Statement::Constant(Value::integer(1)), (6, 7))
|
|
)]),
|
|
(0, 9)
|
|
)
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn nonexistant_field_string() {
|
|
let source = "{ x = 1 }.'y'";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::UndefinedField {
|
|
identifier: Node::new(Statement::Constant(Value::string("y")), (10, 13)),
|
|
map: Node::new(
|
|
Statement::Map(vec![(
|
|
Node::new(Statement::Identifier(Identifier::new("x")), (2, 3)),
|
|
Node::new(Statement::Constant(Value::integer(1)), (6, 7))
|
|
)]),
|
|
(0, 9)
|
|
)
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn malformed_list_index() {
|
|
let source = "[1, 2, 3]['foo']";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::ExpectedIntegerOrRange {
|
|
actual: Node::new(Statement::Constant(Value::string("foo")), (10, 15)),
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn malformed_field_access() {
|
|
let source = "{ x = 1 }.0";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::ExpectedIdentifierOrString {
|
|
actual: Node::new(Statement::Constant(Value::integer(0)), (10, 11)),
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn length_no_arguments() {
|
|
let source = "length()";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::ExpectedValueArgumentCount {
|
|
expected: 1,
|
|
actual: 0,
|
|
position: (0, 6)
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn float_plus_integer() {
|
|
let source = "42.0 + 2";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::TypeConflict {
|
|
actual_statement: Node::new(Statement::Constant(Value::integer(2)), (7, 8)),
|
|
actual_type: Type::Integer,
|
|
expected: Type::Float,
|
|
},
|
|
source
|
|
})
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn integer_plus_boolean() {
|
|
let source = "42 + true";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::TypeConflict {
|
|
actual_statement: Node::new(Statement::Constant(Value::boolean(true)), (5, 9)),
|
|
actual_type: Type::Boolean,
|
|
expected: Type::Integer,
|
|
},
|
|
source
|
|
})
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn is_even_expects_number() {
|
|
let source = "is_even('hello')";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::TypeConflict {
|
|
actual_statement: Node::new(
|
|
Statement::Constant(Value::string("hello")),
|
|
(8, 15)
|
|
),
|
|
actual_type: Type::String,
|
|
expected: Type::Number,
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn is_odd_expects_number() {
|
|
let source = "is_odd('hello')";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::TypeConflict {
|
|
actual_statement: Node::new(
|
|
Statement::Constant(Value::string("hello")),
|
|
(7, 14)
|
|
),
|
|
actual_type: Type::String,
|
|
expected: Type::Number,
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn undefined_variable() {
|
|
let source = "foo";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::UndefinedVariable {
|
|
identifier: Node::new(Statement::Identifier(Identifier::new("foo")), (0, 3)),
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
}
|