3.1 KiB
{:.postcard-grammar.textsyntax}
| Document | := | Value ws |
| Value | := | ws (Record | Collection | Atom | Embedded | Annotated) |
| Collection | := | Sequence | Dictionary | Set |
| Atom | := | Boolean | ByteString | String | QuotedSymbol | Symbol | Number |
| ws | := | (space | tab | cr | lf |,)⋆ |
| delimiter | := | ws | < | > | [ | ] | { | } | # | : | " | | | @ | ; |
{:.postcard-grammar.textsyntax}
| Record | := | <Value+ ws> |
| Sequence | := | [Value⋆ ws] |
| Dictionary | := | { (Value ws:Value)⋆ ws} |
| Set | := | #{Value⋆ ws} |
{:.postcard-grammar.textsyntax}
| Boolean | := | #t|#f |
| ByteString | := | #"binchar⋆ "|#x" (ws hex hex)⋆ ws"|#[ (ws base64char)⋆ ws] |
| String | := | " (« any unicode scalar value except \ or " » | escaped |\")⋆ " |
| QuotedSymbol | := | | (« any unicode scalar value except \ or | » | escaped |\|)⋆ | |
| Symbol | := | (A..Z|a..z|0..9| sympunct | symuchar)+ |
| Number | := | Float | Double | SignedInteger |
| Float | := | flt (f|F) |#xf" (ws hex hex)4 ws" |
| Double | := | flt |#xd" (ws hex hex)8 ws" |
| SignedInteger | := | int |
{:.postcard-grammar.textsyntax}
| Embedded | := | #!Value |
| Annotated | := | Annotation Value |
| Annotation | := | @Value |# ((space | tab) linecomment) (cr | lf) |
| linecomment | := | « any unicode scalar value except cr or lf »⋆ |
{:.postcard-grammar.textsyntax}
| escaped | := | \\|\/|\b|\f|\n|\r|\t|\uhex hex hex hex |
| binescaped | := | \\|\/|\b|\f|\n|\r|\t|\xhex hex |
| binchar | := | « any unicode scalar value ≥32 and ≤126, except \ or " » | binescaped |\" |
| base64char | := | A..Z|a..z|0..9|+|/|-|_|= |
| sympunct | := | ~|!|$|%|^|&|*|?|_|=|+|-|/|. |
| symuchar | := | « any scalar value ≥128 whose Unicode category is Lu, Ll, Lt, Lm, Lo, Mn, Mc, Me, Nd, Nl, No, Pc, Pd, Po, Sc, Sm, Sk, So, or Co » |
{:.postcard-grammar.textsyntax}
| flt | := | int ( frac exp | frac | exp ) |
| int | := | (-|+) (0..9)+ |
| frac | := | . (0..9)+ |
| exp | := | (e|E) (-|+) (0..9)+ |
| hex | := | A..F|a..f|0..9 |