Playing with Pest (again)

pestgroupstest/Cargo.lock

@@ -0,0 +1,212 @@
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pestgroupstest/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "pestgroupstest"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+pest = "2.7.5"
+pest_derive = "2.7.5"

pestgroupstest/README.md

@@ -0,0 +1,3 @@
+# PestGroupTest
+
+Testing using Pest to grab groups of values

pestgroupstest/src/csv.pest

@@ -0,0 +1,7 @@
+csv = { SOI ~ line ~ EOI }
+
+line = _{ (value | group)+ }
+value = @{ (ASCII_ALPHANUMERIC | ".")+ }
+group = { "(" ~ line ~ ")" }
+
+WHITESPACE = _{ (" " | "\t") }

pestgroupstest/src/main.rs

@@ -0,0 +1,29 @@
+use pest::Parser;
+use pest_derive::Parser;
+
+#[derive(Parser)]
+#[grammar = "csv.pest"]
+struct CsvParser;
+
+fn main() {
+    let line = "(1 2 3) 123 123 (123 (123))";
+    let mut parser = CsvParser::parse(Rule::csv, &line).unwrap();
+    let _csv = parser.next().unwrap();
+    let worker = _csv
+        .into_inner()
+        .filter_map(|pair| extract(pair))
+        .collect::<Vec<_>>();
+    println!("{:?}", worker);
+}
+
+fn extract(pair: pest::iterators::Pair<'_, Rule>) -> Option<Vec<&str>> {
+    match pair.as_rule() {
+        Rule::value => Some(vec![pair.as_str()]),
+        Rule::group => {
+            let local = pair.into_inner().filter_map(|pair| extract(pair)).flatten().collect::<Vec<_>>();
+            // println!("{:?}", local);
+            Some(local)
+        }
+        _ => None,
+    }
+}