Continuing work on combinator

schala-lang/src/parsing/combinator.rs

@@ -1,45 +1,45 @@
 use nom::{
     Err,
     branch::alt,
-    bytes::complete::tag,
-    character::complete::{char, one_of, space0, space1, multispace0, line_ending},
-    combinator::{peek, not, value, map},
+    bytes::complete::{take_till, tag},
+    character::complete::{alpha1, alphanumeric0, not_line_ending,none_of, char, one_of, space0, space1, multispace0, line_ending},
+    combinator::{peek, not, value, map, recognize},
     error::{context, VerboseError, ParseError},
-    multi::{fold_many1, many1, many0, separated_list1},
+    multi::{fold_many1, many1, many0, separated_list1, separated_list0},
     sequence::{tuple, preceded},
     IResult, Parser,
 };
+ use std::rc::Rc;
 
 type ParseResult<'a, O> = IResult<&'a str, O, VerboseError<&'a str>>;
 
 use crate::ast::*;
 
-/*
-fn block(input: &str) -> ParseResult<Block> {
-    context("block",
-    map(
-    tuple((
-        char('{'),
-        value((), context("TOP", many0(alt((line_separator, ws))))),
-        block_items,
-        value((), many0(alt((line_separator, ws)))),
-        char('}'),
-    )), |(_, _, items, _, _)| items.into()))(input)
+fn rc_string(s: &str) -> Rc<String> {
+    Rc::new(s.to_string())
 }
-*/
 
+fn tok<'a, O>(input_parser: impl Parser<&'a str, O, VerboseError<&'a str>>) -> impl FnMut(&'a str)
+-> IResult<&'a str, O, VerboseError<&'a str>> { 
 
-fn tok<'a, O>(input_parser: impl Parser<&'a str, O, VerboseError<&'a str>>) -> impl FnMut(&'a str) -> IResult<&'a str, O, VerboseError<&'a str>> {
-    map(tuple((ws0, input_parser)), |(_, output)| output)
+    context("tok", 
+    map(tuple((ws0, input_parser)), |(_, output)|
+    output))
 }
 
+fn kw<'a>(keyword_str: &'static str) -> impl FnMut(&'a str) -> ParseResult<()> {
+    context("keyword",
+    tok(value((), tag(keyword_str))))
+}
+
+
 // whitespace does consume at least one piece of whitespace - use ws0 for maybe none
 fn whitespace(input: &str) -> ParseResult<()> {
     context("whitespace",
     alt((
-    value((), space1),
-    line_comment,
     block_comment,
+    line_comment,
+    value((), space1),
     )))(input)
 }
 
@@ -50,42 +50,47 @@ fn ws0(input: &str) -> ParseResult<()> {
 
 fn line_comment(input: &str) -> ParseResult<()> {
     value((),
-    tuple((tag("//"), many0(not(line_ending)), peek(line_ending)))
+    tuple((tag("//"), not_line_ending)),
     )(input)
 }
 
 fn block_comment(input: &str) -> ParseResult<()> {
+    context("Block-comment",
     value((),
     tuple((
         tag("/*"), 
         many0(alt((
+            value((), none_of("*/")),
+            value((), none_of("/*")),
             block_comment,
-            not(tag("*/"))
         ))),
         tag("*/")
-    )))(input)
+    ))))(input)
 }
 
-fn line_separator(input: &str) -> ParseResult<()> {
-    alt((value((), line_ending), value((), char(';'))))(input)
+fn statement_delimiter(input: &str) -> ParseResult<()> {
+    tok(alt((
+        value((), line_ending),
+        value((), char(';'))
+        ))
+    )(input)
 }
 
-fn block_items(input: &str) -> ParseResult<Vec<Statement>> {
-    context("Block-item",
-    separated_list1(
-        preceded(context("LLLL", ws0), many1(line_separator)),
-        statement,
-    ))(input)
+fn block(input: &str) -> ParseResult<Block> {
+    context("block",
+    map(
+    tuple((
+        tok(char('{')),
+        many0(statement_delimiter),
+        separated_list0(statement_delimiter, statement),
+        many0(statement_delimiter),
+        tok(char('}')),
+    )), |(_, _, items, _, _)| items.into()))(input)
 }
 
 fn statement(input: &str) -> ParseResult<Statement> {
     context("Parsing-statement",
-    map(
-        tuple((
-            ws0,
-            expression_kind,
-            ws0
-        )),|(_, kind, _)| Statement {
+    map(expression_kind, |kind| Statement {
         id: Default::default(),
         location: Default::default(),
         kind: StatementKind::Expression(Expression::new(Default::default(), kind)),
@@ -93,18 +98,46 @@ fn statement(input: &str) -> ParseResult<Statement> {
 }
 
 pub fn expression_kind(input: &str) -> ParseResult<ExpressionKind> {
-    context("expression-kind",
+    context("expression-kind", primary_expr)(input)
+}
+
+fn primary_expr(input: &str) -> ParseResult<ExpressionKind> {
+
+    context("primary-expr",
     alt((
         number_literal,
         bool_literal,
+        identifier_expr,
+    )))(input)
+
+}
+
+fn identifier_expr(input: &str) -> ParseResult<ExpressionKind> {
+    context("identifier-expr", map(qualified_identifier, ExpressionKind::Value))(input)
+}
+
+fn qualified_identifier(input: &str) -> ParseResult<QualifiedName> {
+    tok(
+    map(
+    separated_list1(tag("::"), map(identifier, rc_string)),
+    |items| QualifiedName { id: Default::default(), components: items }
+    ))(input)
+}
+
+fn identifier(input: &str) -> ParseResult<&str> {
+    recognize(
+    tuple((
+        alt((tag("_"), alpha1)),
+        alphanumeric0,
     )))(input)
 }
 
 fn bool_literal(input: &str) -> ParseResult<ExpressionKind> {
+    context("bool-literal",
     alt((
-        map(tok(tag("true")), |_| ExpressionKind::BoolLiteral(true)),
-        map(tok(tag("false")), |_| ExpressionKind::BoolLiteral(false)),
-    ))(input)
+        map(kw("true"), |_| ExpressionKind::BoolLiteral(true)),
+        map(kw("false"), |_| ExpressionKind::BoolLiteral(false)),
+    )))(input)
 }
 
 fn number_literal(input: &str) -> ParseResult<ExpressionKind> {
@@ -195,32 +228,59 @@ mod test {
 
     use super::*;
 
+fn rc(s: &str) -> Rc<String> {
+    Rc::new(s.to_owned())
+}
+macro_rules! qn {
+  ( $( $component:ident),* ) => {
+    {
+        let mut components = vec![];
+        $(
+        components.push(rc(stringify!($component)));
+        )*
+        QualifiedName { components, id: Default::default() }
+    }
+  };
+}
+
     #[test]
     fn combinator_test1() {
         assert_eq!(digits(digit_group_dec)("342").unwrap().1, vec!['3', '4', '2']);
         assert_eq!(bin_literal("0b1111qsdf"), Ok(("qsdf", 15)));
     }
 
+    #[test]
+    fn combinator_test_ws0() {
+        assert_eq!(block_comment("/*yolo*/").unwrap(), ("", ()));
+        assert_eq!(block_comment("/*yolo*/ jumpy /*nah*/").unwrap(), (" jumpy /*nah*/", ()));
+        assert_eq!(ws0("/*    yolo  */ ").unwrap(), ("", ()));
+        assert_eq!(ws0("/*  /* no */   yolo  */ ").unwrap(), ("", ()));
+    }
+
     #[test]
     fn combinator_test2() {
         for s in ["  15", "   0b1111", "   1_5_", "0XF__", "0Xf"].iter() {
             assert_eq!(expression_kind(s).unwrap().1, ExpressionKind::NatLiteral(15));
         }
+
+        assert_eq!(expression_kind(" /*gay*/  true").unwrap().1, ExpressionKind::BoolLiteral(true));
+        assert_eq!(expression_kind(" /*yolo*/  barnaby").unwrap().1, ExpressionKind::Value(qn!(barnaby)));
     }
 
-    /*
     #[test]
     fn combinator_test3() {
+        let source = "{}";
+        assert_eq!(block(source).unwrap().1, vec![].into());
         let source = r#"{
 
-            4_5
-            11; 0xf
+            //hella
+            4_5 //bog
+            11; /*chutney*/0xf
             }"#;
         let parsed = block(source).map_err(|err| match err {
             Err::Error(err) | Err::Failure(err) => nom::error::convert_error(source, err),
             _ => panic!()
         });
-        //let parsed = block(source);
 
         if let Err(err) = parsed {
             println!("{}", err);
@@ -239,5 +299,4 @@ mod test {
             ExpressionKind::NatLiteral(15))) },
         ].into());
     }
-    */
 }

schala-lang/src/parsing/mod.rs

@@ -1,6 +1,6 @@
 #![allow(clippy::upper_case_acronyms)]
 
-mod combinator;
+pub mod combinator;
 mod peg_parser;
 mod test;
 

schala-lang/src/parsing/test.rs

@@ -1352,3 +1352,5 @@ fn backtick_operators() {
     assert_eq!(output, vec![digit!("1"), op!("plus"), digit!("2")]);
 }
 */
+
+