Introduce custom lexer (#59)

crates/air-parser/src/parser/mod.rs

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+pub mod air_parser;
+mod lexer;
+
+// air is auto-generated, so exclude it from `cargo fmt -- --check` and `cargo clippy`
+#[rustfmt::skip]
+#[allow(clippy::all)]
+mod air;
+
+pub mod ast;
+
+#[cfg(test)]
+pub mod tests;
+
+pub use self::air_parser::parse;
+pub use air::AIRParser;
+pub use lexer::AIRLexer;
+
+fn into_variable_and_path(str: &str, pos: usize) -> (&str, &str) {
+    (&str[0..pos], &str[pos + 1..])
+}