Add a Rust parser exampleHEADmaster

2 files changed, 57 insertions, 0 deletions

diff --git a/rust-nom/Cargo.toml b/rust-nom/Cargo.toml
new file mode 100644
index 0000000..772dcbd
--- /dev/null
+++ b/rust-nom/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "example"
+version = "0.0.0"
+
+[dependencies]
+nom = "~7"
+
+[[bin]]
+name = "example"
+path = "example.rs"
diff --git a/rust-nom/example.rs b/rust-nom/example.rs
new file mode 100644
index 0000000..fcc9f5b
--- /dev/null
+++ b/rust-nom/example.rs
@@ -0,0 +1,47 @@
+extern crate nom;
+use std::env;
+pub use nom::{
+    IResult,
+    multi::{many0, many1},
+    branch::alt,
+    sequence::{delimited, preceded},
+    character::complete::{one_of, none_of, anychar, char}
+};
+use Node::{Tree, Literal};
+
+type Forest = Vec<Node>;
+
+#[derive(Debug)]
+enum Node {
+    Tree(Forest),
+    Literal(String),
+}
+
+fn parse_literal(input: &str) -> IResult<&str, Node> {
+    alt((many1(one_of(" \n")),
+         many1(alt((preceded(char('\\'), one_of(" \n()\\")),
+                    none_of(" \n()\\"))))))
+        (input)
+        .map(|(next_input, v)|
+             (next_input, Literal(v.into_iter().collect())))
+}
+
+fn parse_tree(input: &str) -> IResult<&str, Node> {
+    delimited(char('('), parse_forest, char(')'))(input)
+        .map(|(ni, f)| (ni, Tree(f)))
+}
+
+fn parse_elem(input: &str) -> IResult<&str, Node> {
+    alt((parse_tree, parse_literal))(input)
+}
+
+fn parse_forest(input: &str) -> IResult<&str, Forest> {
+    many0(parse_elem)(input)
+}
+
+fn main() {
+    match env::args().nth(1) {
+        None => println!("Argumetns: <input>"),
+        Some(input) => println!("Result: {:?}", parse_forest(input.as_ref()))
+    }
+}