911 lines
32 KiB
Rust
911 lines
32 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, StructInstantiation, UnaryOperator},
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parse, AbstractSyntaxTree, Context, DustError, Identifier, Node, Span, Statement,
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StructDefinition, StructType, 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::Assignment {
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identifier, value, ..
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} => {
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self.analyze_statement(value)?;
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let value_type = value.inner.expected_type(self.context);
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if let Some(r#type) = value_type {
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self.context
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.set_type(identifier.inner.clone(), r#type, identifier.position);
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} else {
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return Err(AnalyzerError::ExpectedValue {
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actual: value.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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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::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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statement: 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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statement: 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::Invokation {
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invokee,
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value_arguments,
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..
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} => {
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self.analyze_statement(invokee)?;
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let invokee_type = invokee.inner.expected_type(self.context);
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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 let Some(Type::Struct(struct_type)) = invokee_type {
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match struct_type {
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StructType::Unit { name } => todo!(),
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StructType::Tuple { fields, .. } => {
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for (expected_type, argument) in fields.iter().zip(arguments.iter())
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{
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let actual_type = argument.inner.expected_type(self.context);
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if let Some(actual_type) = actual_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: argument.clone(),
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actual_type: conflict.actual,
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expected: expected_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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}
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StructType::Fields { name, fields } => todo!(),
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}
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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::StructDefinition(struct_definition) => {
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let (name, r#type) = match struct_definition {
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StructDefinition::Unit { name } => (
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name.inner.clone(),
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Type::Struct(StructType::Unit {
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name: name.inner.clone(),
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}),
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),
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StructDefinition::Tuple { name, fields } => (
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name.inner.clone(),
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Type::Struct(StructType::Tuple {
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name: name.inner.clone(),
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fields: fields
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.iter()
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.map(|type_node| type_node.inner.clone())
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.collect(),
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}),
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),
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};
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self.context.set_type(name, r#type, node.position);
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}
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Statement::StructInstantiation(struct_instantiation) => {
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let name = match struct_instantiation {
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StructInstantiation::Tuple { name, .. } => name,
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};
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if self.context.get_type(&name.inner).is_none() {
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return Err(AnalyzerError::UndefinedType {
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identifier: name.clone(),
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});
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}
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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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UndefinedField {
|
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identifier: Node<Statement>,
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statement: Node<Statement>,
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},
|
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UndefinedType {
|
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identifier: Node<Identifier>,
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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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UndefinedVariable {
|
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identifier: 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 {
|
|
AnalyzerError::ExpectedBoolean { actual, .. } => actual.position,
|
|
AnalyzerError::ExpectedIdentifier { actual, .. } => actual.position,
|
|
AnalyzerError::ExpectedIdentifierOrString { actual } => actual.position,
|
|
AnalyzerError::ExpectedIntegerOrRange { actual, .. } => actual.position,
|
|
AnalyzerError::ExpectedList { actual } => actual.position,
|
|
AnalyzerError::ExpectedMap { actual } => actual.position,
|
|
AnalyzerError::ExpectedValue { actual } => actual.position,
|
|
AnalyzerError::ExpectedValueArgumentCount { position, .. } => *position,
|
|
AnalyzerError::IndexOutOfBounds { list, index, .. } => {
|
|
(list.position.0, index.position.1)
|
|
}
|
|
AnalyzerError::TypeConflict {
|
|
actual_statement, ..
|
|
} => actual_statement.position,
|
|
AnalyzerError::UndefinedField { identifier, .. } => identifier.position,
|
|
AnalyzerError::UndefinedType { identifier } => identifier.position,
|
|
AnalyzerError::UndefinedVariable { identifier } => identifier.position,
|
|
AnalyzerError::UnexpectedIdentifier { identifier } => identifier.position,
|
|
AnalyzerError::UnexectedString { actual } => actual.position,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Error for AnalyzerError {}
|
|
|
|
impl Display for AnalyzerError {
|
|
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
|
|
match self {
|
|
AnalyzerError::ExpectedBoolean { actual, .. } => {
|
|
write!(f, "Expected boolean, found {}", actual)
|
|
}
|
|
AnalyzerError::ExpectedIdentifier { actual, .. } => {
|
|
write!(f, "Expected identifier, found {}", actual)
|
|
}
|
|
AnalyzerError::ExpectedIdentifierOrString { actual } => {
|
|
write!(f, "Expected identifier or string, found {}", actual)
|
|
}
|
|
AnalyzerError::ExpectedIntegerOrRange { actual, .. } => {
|
|
write!(f, "Expected integer or range, found {}", actual)
|
|
}
|
|
AnalyzerError::ExpectedList { actual } => write!(f, "Expected list, found {}", actual),
|
|
AnalyzerError::ExpectedMap { actual } => write!(f, "Expected map, found {}", actual),
|
|
AnalyzerError::ExpectedValue { actual, .. } => {
|
|
write!(f, "Expected value, found {}", actual)
|
|
}
|
|
AnalyzerError::ExpectedValueArgumentCount {
|
|
expected, actual, ..
|
|
} => write!(f, "Expected {} value arguments, found {}", expected, actual),
|
|
AnalyzerError::IndexOutOfBounds {
|
|
list,
|
|
index_value,
|
|
length,
|
|
..
|
|
} => write!(
|
|
f,
|
|
"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,
|
|
statement: map,
|
|
} => {
|
|
write!(f, "Undefined field {} in map {}", identifier, map)
|
|
}
|
|
AnalyzerError::UndefinedType { identifier } => {
|
|
write!(f, "Undefined type {}", identifier)
|
|
}
|
|
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 tuple_struct_with_wrong_field_types() {
|
|
let source = "
|
|
struct Foo(int, float)
|
|
Foo(1, 2)
|
|
";
|
|
|
|
assert_eq!(
|
|
analyze(source),
|
|
Err(DustError::AnalyzerError {
|
|
analyzer_error: AnalyzerError::TypeConflict {
|
|
actual_statement: Node::new(Statement::Constant(Value::integer(2)), (55, 56)),
|
|
actual_type: Type::Integer,
|
|
expected: Type::Float
|
|
},
|
|
source
|
|
})
|
|
);
|
|
}
|
|
|
|
#[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)),
|
|
statement: Node::new(
|
|
Statement::Map(vec![(
|
|
Node::new(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)),
|
|
statement: Node::new(
|
|
Statement::Map(vec![(
|
|
Node::new(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
|
|
})
|
|
);
|
|
}
|
|
}
|