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examples/acme_parser.rs

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+use std::str::Chars;
+
+extern crate datafusion_sql;
+
+use datafusion_sql::tokenizer::*;
+use datafusion_sql::parser::*;
+
+#[derive(Debug)]
+enum AcmeToken {
+    /// Factorial operator `!!`
+    Factorial
+}
+
+
+#[derive(Debug)]
+enum AcmeOperator {
+    Factorial
+}
+
+#[derive(Debug)]
+enum AcmeTokenizerError {
+
+}
+
+struct AcmeTokenizer {
+    //chars: &'a Chars
+}
+
+impl SQLTokenizer<AcmeToken, AcmeTokenizerError> for AcmeTokenizer {
+
+    fn peek_token(&mut self) -> Result<Option<SQLToken<AcmeToken>>, TokenizerError<AcmeTokenizerError>> {
+        Ok(Some(SQLToken::Custom(AcmeToken::Factorial)))
+    }
+
+    fn next_token(&mut self) -> Result<Option<SQLToken<AcmeToken>>, TokenizerError<AcmeTokenizerError>> {
+        Ok(Some(SQLToken::Custom(AcmeToken::Factorial)))
+    }
+}
+
+
+
+fn main() {
+
+    let sql = "1 + !! 5 * 2";
+
+    let mut tokenizer = AcmeTokenizer { };
+
+    println!("token = {:?}", tokenizer.peek_token().unwrap());
+
+
+
+}