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Create Whitespace grammar productions #1991

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Create Whitespace grammar productions #1991

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6 changes: 0 additions & 6 deletions src/input-format.md
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Expand Up @@ -6,12 +6,6 @@ r[input.syntax]
@root CHAR -> <a Unicode scalar value>

NUL -> U+0000

TAB -> U+0009

LF -> U+000A

CR -> U+000D
```

r[input.intro]
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39 changes: 26 additions & 13 deletions src/whitespace.md
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@@ -1,21 +1,34 @@
r[lex.whitespace]
# Whitespace

r[whitespace.syntax]
```grammar,lexer
@root WHITESPACE ->
// end of line
LF
| U+000B // vertical tabulation
| U+000C // form feed
| CR
| U+0085 // Unicode next line
| U+2028 // Unicode LINE SEPARATOR
| U+2029 // Unicode PARAGRAPH SEPARATOR
// Ignorable Code Point
| U+200E // Unicode LEFT-TO-RIGHT MARK
| U+200F // Unicode RIGHT-TO-LEFT MARK
// horizontal whitespace
| TAB
| U+0020 // space ' '

TAB -> U+0009 // horizontal tab ('\t')

LF -> U+000A // line feed ('\n')

CR -> U+000D // carriage return ('\r')
```

r[lex.whitespace.intro]
Whitespace is any non-empty string containing only characters that have the
[`Pattern_White_Space`] Unicode property, namely:

- `U+0009` (horizontal tab, `'\t'`)
- `U+000A` (line feed, `'\n'`)
- `U+000B` (vertical tab)
- `U+000C` (form feed)
- `U+000D` (carriage return, `'\r'`)
- `U+0020` (space, `' '`)
- `U+0085` (next line)
- `U+200E` (left-to-right mark)
- `U+200F` (right-to-left mark)
- `U+2028` (line separator)
- `U+2029` (paragraph separator)
[`Pattern_White_Space`] Unicode property.

r[lex.whitespace.token-sep]
Rust is a "free-form" language, meaning that all forms of whitespace serve only
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