icu4x-datagen: implement ability to invert regex

Author: m4rch3n1ng

provider/icu4x-datagen/src/main.rs

@@ -46,6 +46,7 @@ use std::str::FromStr;
 struct Filter {
     domain: String,
     regex: Regex,
+    inverted: bool,
 }
 
 #[derive(Debug)]
@@ -80,6 +81,11 @@ impl FromStr for Filter {
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         let (domain, regex) = s.split_once('=').ok_or(FilterError::NoFilter)?;
 
+        let (regex, inverted) = regex
+            .strip_prefix('-')
+            .map(|regex| (regex, true))
+            .unwrap_or((regex, false));
+
         let regex = regex.strip_prefix('/').ok_or(FilterError::NoOpeningSlash)?;
         let regex = regex.strip_suffix('/').ok_or(FilterError::NoClosingSlash)?;
 
@@ -90,6 +96,7 @@ impl FromStr for Filter {
         Ok(Filter {
             domain: domain.to_owned(),
             regex,
+            inverted,
         })
     }
 }
@@ -589,8 +596,10 @@ fn main() -> eyre::Result<()> {
 
     for filter in &cli.attribute_filter {
         let regex = filter.regex.clone();
-        driver =
-            driver.with_marker_attributes_filter(&filter.domain, move |attr| regex.is_match(attr))
+        let inverted = filter.inverted;
+        driver = driver.with_marker_attributes_filter(&filter.domain, move |attr| {
+            regex.is_match(attr) ^ inverted
+        })
     }
 
     let metadata: Result<ExportMetadata, DataError> = match cli.format {