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mod parser;
use crate::LicenseReq;
use smallvec::SmallVec;
use std::fmt;
#[derive(Debug, Clone)]
pub struct ExpressionReq {
pub req: LicenseReq,
pub span: std::ops::Range<u32>,
}
impl PartialEq for ExpressionReq {
fn eq(&self, o: &Self) -> bool {
self.req == o.req
}
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Copy, Clone)]
pub enum Operator {
And,
Or,
}
#[derive(Debug, Clone, PartialEq)]
pub enum ExprNode {
Op(Operator),
Req(ExpressionReq),
}
#[derive(Clone)]
pub struct Expression {
pub(crate) expr: SmallVec<[ExprNode; 5]>,
pub(crate) original: String,
}
impl Expression {
pub fn requirements(&self) -> impl Iterator<Item = &ExpressionReq> {
self.expr.iter().filter_map(|item| match item {
ExprNode::Req(req) => Some(req),
_ => None,
})
}
pub fn iter(&self) -> impl Iterator<Item = &ExprNode> {
self.expr.iter()
}
pub fn evaluate<AF: FnMut(&LicenseReq) -> bool>(&self, mut allow_func: AF) -> bool {
let mut result_stack = SmallVec::<[bool; 8]>::new();
for node in self.expr.iter() {
match node {
ExprNode::Req(req) => {
let allowed = allow_func(&req.req);
result_stack.push(allowed);
}
ExprNode::Op(Operator::Or) => {
let a = result_stack.pop().unwrap();
let b = result_stack.pop().unwrap();
result_stack.push(a || b);
}
ExprNode::Op(Operator::And) => {
let a = result_stack.pop().unwrap();
let b = result_stack.pop().unwrap();
result_stack.push(a && b);
}
}
}
result_stack.pop().unwrap()
}
pub fn evaluate_with_failures<AF: FnMut(&LicenseReq) -> bool>(
&self,
mut allow_func: AF,
) -> Result<(), Vec<&ExpressionReq>> {
let mut result_stack = SmallVec::<[bool; 8]>::new();
let mut failures = Vec::new();
for node in self.expr.iter() {
match node {
ExprNode::Req(req) => {
let allowed = allow_func(&req.req);
result_stack.push(allowed);
if !allowed {
failures.push(req);
}
}
ExprNode::Op(Operator::Or) => {
let a = result_stack.pop().unwrap();
let b = result_stack.pop().unwrap();
result_stack.push(a || b);
}
ExprNode::Op(Operator::And) => {
let a = result_stack.pop().unwrap();
let b = result_stack.pop().unwrap();
result_stack.push(a && b);
}
}
}
if let Some(false) = result_stack.pop() {
Err(failures)
} else {
Ok(())
}
}
}
impl AsRef<str> for Expression {
fn as_ref(&self) -> &str {
&self.original
}
}
impl fmt::Debug for Expression {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for (i, node) in self.expr.iter().enumerate() {
if i > 0 {
f.write_str(" ")?;
}
match node {
ExprNode::Req(req) => write!(f, "{}", req.req)?,
ExprNode::Op(Operator::And) => f.write_str("AND")?,
ExprNode::Op(Operator::Or) => f.write_str("OR")?,
}
}
Ok(())
}
}
impl fmt::Display for Expression {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(&self.original)
}
}
impl PartialEq for Expression {
fn eq(&self, o: &Self) -> bool {
if self.expr.len() != o.expr.len() {
return false;
}
!self.expr.iter().zip(o.expr.iter()).any(|(a, b)| a != b)
}
}
#[cfg(test)]
mod test {
use super::Expression;
#[test]
#[allow(clippy::eq_op)]
fn eq() {
let normal = Expression::parse("MIT OR Apache-2.0").unwrap();
let extra_parens = Expression::parse("(MIT OR (Apache-2.0))").unwrap();
let llvm_exc = Expression::parse("MIT OR Apache-2.0 WITH LLVM-exception").unwrap();
assert_eq!(normal, normal);
assert_eq!(extra_parens, extra_parens);
assert_eq!(llvm_exc, llvm_exc);
assert_eq!(normal, extra_parens);
assert_ne!(normal, llvm_exc);
}
}