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use crate::spdx::license::LicenseTree;
use pest::Parser;
use pest_derive::Parser;
#[derive(Parser)]
#[grammar = "spdx/expression.pest"]
pub struct ExpressionParser;
pub type Expression = LicenseTree;
impl ExpressionParser {
pub fn new() -> Self {
Self
}
pub fn parse(&self, input: &str) -> Result<LicenseTree, String> {
let pairs = <Self as Parser<Rule>>::parse(Rule::expression, input)
.map_err(|e| format!("Parse error: {}", e))?;
for pair in pairs {
return self.parse_expression(pair);
}
Err("No valid expression found".to_string())
}
fn parse_expression(&self, pair: pest::iterators::Pair<Rule>) -> Result<LicenseTree, String> {
match pair.as_rule() {
Rule::expression => {
let mut inner = pair.into_inner();
if let Some(expr) = inner.next() {
self.parse_expression(expr)
} else {
Err("Empty expression".to_string())
}
}
Rule::or_expression => {
let mut inner = pair.into_inner();
let mut left = self.parse_expression(inner.next().ok_or("Missing left operand")?)?;
while let Some(op) = inner.next() {
if op.as_rule() == Rule::or_op {
let right = self.parse_expression(inner.next().ok_or("Missing right operand")?)?;
left = LicenseTree::Binary {
left: Box::new(left),
op: "OR".to_string(),
right: Box::new(right),
};
}
}
Ok(left)
}
Rule::and_expression => {
let mut inner = pair.into_inner();
let mut left = self.parse_expression(inner.next().ok_or("Missing left operand")?)?;
while let Some(op) = inner.next() {
if op.as_rule() == Rule::and_op {
let right = self.parse_expression(inner.next().ok_or("Missing right operand")?)?;
left = LicenseTree::Binary {
left: Box::new(left),
op: "AND".to_string(),
right: Box::new(right),
};
}
}
Ok(left)
}
Rule::with_expression => {
let mut inner = pair.into_inner();
let license = self.parse_expression(inner.next().ok_or("Missing license in WITH expression")?)?;
if let Some(with_op) = inner.next() {
if with_op.as_rule() == Rule::with_op {
let exception = inner.next().ok_or("Missing exception in WITH expression")?;
Ok(LicenseTree::With {
license: Box::new(license),
exception: exception.as_str().to_string(),
})
} else {
Ok(license)
}
} else {
Ok(license)
}
}
Rule::primary => {
let mut inner = pair.into_inner();
if let Some(expr) = inner.next() {
self.parse_expression(expr)
} else {
Err("Empty primary expression".to_string())
}
}
Rule::parenthesized_expression => {
let mut inner = pair.into_inner();
if let Some(expr) = inner.next() {
Ok(LicenseTree::Parenthesized(Box::new(self.parse_expression(expr)?)))
} else {
Err("Empty parenthesized expression".to_string())
}
}
Rule::license_id => {
Ok(LicenseTree::License(pair.as_str().to_string()))
}
Rule::license_ref => {
Ok(LicenseTree::License(pair.as_str().to_string()))
}
Rule::exception_id => {
Ok(LicenseTree::License(pair.as_str().to_string()))
}
_ => Err(format!("Unexpected rule: {:?}", pair.as_rule())),
}
}
}
impl Default for ExpressionParser {
fn default() -> Self {
Self::new()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_simple_license() {
let parser = ExpressionParser::new();
let result = parser.parse("MIT").unwrap();
match result {
LicenseTree::License(id) => assert_eq!(id, "MIT"),
_ => panic!("Expected simple license"),
}
}
#[test]
fn test_binary_and_expression() {
let parser = ExpressionParser::new();
let result = parser.parse("MIT AND Apache-2.0");
match result {
Ok(tree) => {
// println!("Parsed tree: {:?}", tree);
match tree {
LicenseTree::Binary { left, op, right } => {
assert_eq!(op, "AND");
match (left.as_ref(), right.as_ref()) {
(LicenseTree::License(l), LicenseTree::License(r)) => {
assert_eq!(l, "MIT");
assert_eq!(r, "Apache-2.0");
}
_ => panic!("Expected license operands, got: {:?} and {:?}", left, right),
}
}
_ => panic!("Expected binary expression, got: {:?}", tree),
}
}
Err(e) => panic!("Parse error: {}", e),
}
}
#[test]
fn test_binary_or_expression() {
let parser = ExpressionParser::new();
let result = parser.parse("MIT OR Apache-2.0").unwrap();
match result {
LicenseTree::Binary { left, op, right } => {
assert_eq!(op, "OR");
match (left.as_ref(), right.as_ref()) {
(LicenseTree::License(l), LicenseTree::License(r)) => {
assert_eq!(l, "MIT");
assert_eq!(r, "Apache-2.0");
}
_ => panic!("Expected license operands"),
}
}
_ => panic!("Expected binary expression"),
}
}
#[test]
fn test_with_expression() {
let parser = ExpressionParser::new();
let result = parser.parse("GPL-2.0 WITH Classpath-exception-2.0").unwrap();
match result {
LicenseTree::With { license, exception } => {
assert_eq!(exception, "Classpath-exception-2.0");
match license.as_ref() {
LicenseTree::License(id) => assert_eq!(id, "GPL-2.0"),
_ => panic!("Expected license in WITH expression"),
}
}
_ => panic!("Expected WITH expression"),
}
}
#[test]
fn test_parenthesized_expression() {
let parser = ExpressionParser::new();
let result = parser.parse("(MIT OR Apache-2.0)").unwrap();
match result {
LicenseTree::Parenthesized(inner) => {
match inner.as_ref() {
LicenseTree::Binary { op, .. } => assert_eq!(op, "OR"),
_ => panic!("Expected binary expression in parentheses"),
}
}
_ => panic!("Expected parenthesized expression"),
}
}
#[test]
fn test_complex_expression() {
let parser = ExpressionParser::new();
let result = parser.parse("MIT AND (Apache-2.0 OR GPL-3.0)").unwrap();
match result {
LicenseTree::Binary { left, op, right } => {
assert_eq!(op, "AND");
match (left.as_ref(), right.as_ref()) {
(LicenseTree::License(l), LicenseTree::Parenthesized(inner)) => {
assert_eq!(l, "MIT");
match inner.as_ref() {
LicenseTree::Binary { op, .. } => assert_eq!(op, "OR"),
_ => panic!("Expected OR in parentheses"),
}
}
_ => panic!("Expected license and parenthesized expression"),
}
}
_ => panic!("Expected complex binary expression"),
}
}
#[test]
fn test_license_ref() {
let parser = ExpressionParser::new();
let result = parser.parse("LicenseRef-Custom").unwrap();
match result {
LicenseTree::License(id) => assert_eq!(id, "LicenseRef-Custom"),
_ => panic!("Expected license reference"),
}
}
#[test]
fn test_case_insensitive_operators() {
let parser = ExpressionParser::new();
let result = parser.parse("MIT and Apache-2.0").unwrap();
match result {
LicenseTree::Binary { op, .. } => assert_eq!(op, "AND"),
_ => panic!("Expected binary expression with normalized operator"),
}
}
}
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