More readable lexer tests

src/lexer/ptr.rs

@@ -56,6 +56,7 @@ impl<'s> Ptr<'s> {
     }
 
     fn chars(&self) -> Chars {
-        self.text[self.len.0 as usize ..].chars()
+        let len: u32 = self.len.into();
+        self.text[len as usize ..].chars()
     }
 }

src/text.rs

@@ -2,9 +2,7 @@ use std::fmt;
 use std::ops;
 
 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub struct TextUnit(
-    pub(crate) u32
-);
+pub struct TextUnit(u32);
 
 impl TextUnit {
     pub fn len_of_char(c: char) -> TextUnit {

tests/data/lexer/0001_hello.txt

@@ -1,3 +1,3 @@
-IDENT 5
-WHITESPACE 1
-IDENT 5
+IDENT 5 "hello"
+WHITESPACE 1 " "
+IDENT 5 "world"

tests/data/lexer/0002_whitespace.txt

@@ -1,12 +1,12 @@
-IDENT 1
-WHITESPACE 1
-IDENT 1
-WHITESPACE 2
-IDENT 1
-WHITESPACE 1
-IDENT 1
-WHITESPACE 2
-IDENT 1
-WHITESPACE 1
-IDENT 1
-WHITESPACE 1
+IDENT 1 "a"
+WHITESPACE 1 " "
+IDENT 1 "b"
+WHITESPACE 2 "  "
+IDENT 1 "c"
+WHITESPACE 1 "\n"
+IDENT 1 "d"
+WHITESPACE 2 "\n\n"
+IDENT 1 "e"
+WHITESPACE 1 "\t"
+IDENT 1 "f"
+WHITESPACE 1 "\n"

tests/data/lexer/0003_ident.txt

@@ -1,14 +1,14 @@
-IDENT 3
-WHITESPACE 1
-IDENT 4
-WHITESPACE 1
-IDENT 4
-WHITESPACE 1
-UNDERSCORE 1
-WHITESPACE 1
-IDENT 2
-WHITESPACE 1
-IDENT 1
-WHITESPACE 1
-IDENT 12
-WHITESPACE 1
+IDENT 3 "foo"
+WHITESPACE 1 " "
+IDENT 4 "foo_"
+WHITESPACE 1 " "
+IDENT 4 "_foo"
+WHITESPACE 1 " "
+UNDERSCORE 1 "_"
+WHITESPACE 1 " "
+IDENT 2 "__"
+WHITESPACE 1 " "
+IDENT 1 "x"
+WHITESPACE 1 " "
+IDENT 12 "привет"
+WHITESPACE 1 "\n"

tests/data/lexer/0004_number.txt

@@ -1,62 +1,62 @@
-INT_NUMBER 1
-WHITESPACE 1
-INT_NUMBER 2
-WHITESPACE 1
-INT_NUMBER 2
-WHITESPACE 1
-INT_NUMBER 2
-WHITESPACE 1
-INT_NUMBER 2
-WHITESPACE 1
-INT_NUMBER 2
-WHITESPACE 1
-FLOAT_NUMBER 2
-WHITESPACE 1
-INT_NUMBER 2
-WHITESPACE 1
-INT_NUMBER 2
-WHITESPACE 1
-INT_NUMBER 1
-IDENT 1
-WHITESPACE 1
-INT_NUMBER 5
-WHITESPACE 1
-INT_NUMBER 6
-WHITESPACE 1
-INT_NUMBER 6
-WHITESPACE 1
-INT_NUMBER 18
-WHITESPACE 1
-INT_NUMBER 6
-WHITESPACE 1
-INT_NUMBER 6
-WHITESPACE 1
-FLOAT_NUMBER 6
-WHITESPACE 1
-INT_NUMBER 6
-WHITESPACE 1
-INT_NUMBER 6
-WHITESPACE 1
-INT_NUMBER 1
-ERROR 1
-ERROR 1
-INT_NUMBER 1
-WHITESPACE 1
-INT_NUMBER 1
-ERROR 1
-IDENT 3
-ERROR 1
-ERROR 1
-WHITESPACE 1
-INT_NUMBER 2
-ERROR 1
-INT_NUMBER 1
-WHITESPACE 1
-INT_NUMBER 1
-ERROR 1
-IDENT 1
-ERROR 1
-INT_NUMBER 1
-WHITESPACE 1
-FLOAT_NUMBER 6
-WHITESPACE 1
+INT_NUMBER 1 "0"
+WHITESPACE 1 " "
+INT_NUMBER 2 "0b"
+WHITESPACE 1 " "
+INT_NUMBER 2 "0o"
+WHITESPACE 1 " "
+INT_NUMBER 2 "0x"
+WHITESPACE 1 " "
+INT_NUMBER 2 "00"
+WHITESPACE 1 " "
+INT_NUMBER 2 "0_"
+WHITESPACE 1 " "
+FLOAT_NUMBER 2 "0."
+WHITESPACE 1 " "
+INT_NUMBER 2 "0e"
+WHITESPACE 1 " "
+INT_NUMBER 2 "0E"
+WHITESPACE 1 " "
+INT_NUMBER 1 "0"
+IDENT 1 "z"
+WHITESPACE 1 "\n"
+INT_NUMBER 5 "01790"
+WHITESPACE 1 " "
+INT_NUMBER 6 "0b1790"
+WHITESPACE 1 " "
+INT_NUMBER 6 "0o1790"
+WHITESPACE 1 " "
+INT_NUMBER 18 "0x1790aAbBcCdDeEfF"
+WHITESPACE 1 " "
+INT_NUMBER 6 "001279"
+WHITESPACE 1 " "
+INT_NUMBER 6 "0_1279"
+WHITESPACE 1 " "
+FLOAT_NUMBER 6 "0.1279"
+WHITESPACE 1 " "
+INT_NUMBER 6 "0e1279"
+WHITESPACE 1 " "
+INT_NUMBER 6 "0E1279"
+WHITESPACE 1 "\n"
+INT_NUMBER 1 "0"
+ERROR 1 "."
+ERROR 1 "."
+INT_NUMBER 1 "2"
+WHITESPACE 1 "\n"
+INT_NUMBER 1 "0"
+ERROR 1 "."
+IDENT 3 "foo"
+ERROR 1 "("
+ERROR 1 ")"
+WHITESPACE 1 "\n"
+INT_NUMBER 2 "0e"
+ERROR 1 "+"
+INT_NUMBER 1 "1"
+WHITESPACE 1 "\n"
+INT_NUMBER 1 "0"
+ERROR 1 "."
+IDENT 1 "e"
+ERROR 1 "+"
+INT_NUMBER 1 "1"
+WHITESPACE 1 "\n"
+FLOAT_NUMBER 6 "0.0E-2"
+WHITESPACE 1 "\n"

tests/lexer.rs

@@ -31,6 +31,7 @@ fn lexer_test_cases() -> Vec<PathBuf> {
             acc.push(path);
         }
     }
+    acc.sort();
     acc
 }
 
@@ -38,7 +39,7 @@ fn lexer_test_case(path: &Path) {
     let actual = {
         let text = file::get_text(path).unwrap();
         let tokens = tokenize(&text);
-        dump_tokens(&tokens)
+        dump_tokens(&tokens, &text)
     };
     let expected = file::get_text(&path.with_extension("txt")).unwrap();
     let expected = expected.as_str();
@@ -64,10 +65,15 @@ fn tokenize(text: &str) -> Vec<Token> {
     acc
 }
 
-fn dump_tokens(tokens: &[Token]) -> String {
+fn dump_tokens(tokens: &[Token], text: &str) -> String {
     let mut acc = String::new();
+    let mut offset = 0;
     for token in tokens {
-        write!(acc, "{:?} {}\n", token.kind, token.len).unwrap()
+        let len: u32 = token.len.into();
+        let len = len as usize;
+        let token_text = &text[offset..offset + len];
+        offset += len;
+        write!(acc, "{:?} {} {:?}\n", token.kind, token.len, token_text).unwrap()
     }
     acc
 }