3e4fa12c72
This PR adds a `pp.unicode` option and a `unicode("→", "->")` syntax
description alias for the lower-level `unicodeSymbol "→" "->"` parser.
The syntax is added to the `notation` command as well. When `pp.unicode`
is true (the default) then the first form is used when pretty printing,
and otherwise the second ASCII form is used. A variant, `unicode("→",
"->", preserveForPP)` causes the `->` form to be preferred; delaborators
can insert `→` directly into the syntax, which will be pretty printed
as-is; this allows notations like `fun` to use custom options such as
`pp.unicode.fun` to opt into the unicode form when pretty printing.
Additionally:
- Adds more documentation for the `symbol` and `nonReservedSymbol`
parser descriptions.
- Adds documentation for the
`infix`/`infixr`/`infixl`/`prefix`/`postfix` commands.
- The parenthesizers for symbols are improved to backtrack if the atom
doesn't match.
- Fixes a bug where `&"..."` symbols aren't validated.
This is partial progress for issue #1056. What remains is enabling
`unicode(...)` for mixfix commands and then making use of it for core
notation.
17 lines
325 B
Text
17 lines
325 B
Text
syntax "0" : term
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syntax "'a'" : term
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syntax "`a" : term
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syntax "\"a" : term
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syntax " 0" : term
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syntax " 'a'" : term
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syntax " `a" : term
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syntax " \"a" : term
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syntax &"0" : term
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syntax &"'a'" : term
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syntax &"`a" : term
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syntax &"\"a" : term
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syntax &" 0" : term
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syntax &" 'a'" : term
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syntax &" `a" : term
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syntax &" \"a" : term
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