Add comment parsing

.vscode/settings.json

@@ -1,5 +1,11 @@
 {
     "rust-analyzer.linkedProjects": [
         "./demo/Cargo.toml"
-    ]
+    ],
+    "files.exclude": {
+        "**/*.rpyc": true,
+        "**/*.rpa": true,
+        "**/*.rpymc": true,
+        "**/cache/": true
+    }
 }

demo/demo.csv

@@ -1,5 +0,0 @@
-65279,1179403647,1463895090
-3.1415927,2.7182817,1.618034
--40,-273.15
-13,42
-65537

demo/demo.rpy

@@ -0,0 +1,9 @@
+show black amogus # this is a comment
+# this is a full line comment
+what the heck
+"this is a string with a # comment"
+"this is a string over
+multiple lines"
+this is cool # comment
+
+huh

demo/src/main.rs

@@ -1,5 +1,5 @@
 use renrs;
 
 fn main() {
-    renrs::parse("demo.csv");
+    renrs::parse("demo.rpy");
 }

src/csv.pest

@@ -1,9 +0,0 @@
-// + indicates one or more times
-field = { (ASCII_DIGIT | "." | "-")+ }
-// ~ indicates directly followed by
-// * indicates zero or more times (optional)
-record = { field ~ ("," ~ field)* }
-// SOI - start of input
-// END - end of input
-// There may be trailing newlines at the end
-file = { SOI ~ (record ~ ("\r\n" | "\n"))* ~ "\n"* ~ EOI }

src/lib.rs

@@ -4,32 +4,24 @@ use pest::Parser;
 use pest_derive::Parser;
 
 #[derive(Parser)]
-#[grammar = "csv.pest"]
-struct CSVParser;
+#[grammar = "rpy.pest"]
+struct RpyParser;
 
 pub fn parse(file_path: &str) {
     let unparsed_file = fs::read_to_string(file_path).expect("cannot find file");
-    let file = CSVParser::parse(Rule::file, &unparsed_file)
+    let file = RpyParser::parse(Rule::file, &unparsed_file)
         .expect("unsuccessful parse") // unwrap the parse result
         .next().unwrap(); // get and unwrap the `file` rule; never fails
 
-    let mut field_sum = 0.0;
-    let mut record_count: u64 = 0;
-
     for record in file.into_inner() {
         match record.as_rule() {
-            Rule::record => {
-                record_count += 1;
-
-                for field in record.into_inner() {
-                    field_sum += field.as_str().parse::<f64>().unwrap();
+            Rule::line => {
+                for field in record.into_inner().map(|pairs| pairs.as_str()) {
+                    println!("'{field}'");
                 }
             },
             Rule::EOI => (),
             _ => unreachable!(),
         }
     }
-
-    println!("Sum of fields: {field_sum}");
-    println!("Number of records: {record_count}");
 }

src/rpy.pest

@@ -0,0 +1,17 @@
+// underscores mark are silent rules, are ignored
+WHITESPACE = _{ " " }
+
+// characters are anything but newlines
+char = { !NEWLINE ~ ANY }
+
+// comments are a # followed by
+// any number of non-newline characters
+COMMENT = _{ "#" ~ char* }
+
+// statements are comprised of at least one character
+statement = { char+ }
+
+// lines are comprised of a statement
+line = { statement }
+
+file = { SOI ~ (line ~ ("\r\n" | "\n")*)* ~ "\n"* ~ EOI }