A bit more explanation in README
Getty Ritter
8 years ago
| 160 | 160 | |
| 161 | 161 | If you are using GHC 7.10, several of these will be powerful |
| 162 | 162 | bidirectional pattern synonyms that allow both constructing and |
| 163 |
pattern-match |
|
| 163 | pattern-matching on s-expressions in non-trivial ways: | |
| 164 | 164 | |
| 165 | 165 | ~~~~.haskell |
| 166 | 166 | >>> import Data.SCargot.Repr.Basic |
| 220 | 220 | "(0 bar)" |
| 221 | 221 | ~~~~ |
| 222 | 222 | |
| 223 | Several common atom types appear in the module | |
| 224 | [`Data.SCargot.Common`](https://hackage.haskell.org/package/s-cargot-0.1.0.0/docs/Data-SCargot-Common.html), | |
| 225 | including various kinds of identifiers and number literals. The | |
| 226 | long-term plan for S-Cargot is to include more and more kinds of | |
| 227 | built-in atoms, in order to make putting together an S-Expression | |
| 228 | parser even easier. If you have a common syntax for an atom type | |
| 229 | that you think should be represented there, please | |
| 230 | [suggest it in an issue](https://github.com/aisamanra/s-cargot/issues)! | |
| 231 | ||
| 223 | 232 | ## Carrier Types |
| 224 | 233 | |
| 225 | 234 | As pointed out above, there are three different carrier types that are |
| 290 | 299 | ~~~~.haskell |
| 291 | 300 | >>> let cppComment = string "//" >> manyTill newline >> return () |
| 292 | 301 | >>> decode (setComment cppComment basicParser) "(a //comment\n b)\n" |
| 302 | Right [SCons (SAtom "a") (SCons (SAtom "b") SNil)] | |
| 303 | ~~~~ | |
| 304 | ||
| 305 | The | |
| 306 | [`Data.SCargot.Comments`](https://hackage.haskell.org/package/s-cargot/docs/Data-SCargot-Comments.html) | |
| 307 | module defines some helper functions for creating comment syntaxes, so the | |
| 308 | `cppComment` parser above could be defined as simply | |
| 309 | ||
| 310 | ~~~~.haskell | |
| 311 | >>> let cppComment = lineComment "//" | |
| 312 | >>> decode (setComment cppComment basicParser) "(a //comment\n b)\n" | |
| 313 | Right [SCons (SAtom "a") (SCons (SAtom "b") SNil)] | |
| 314 | ~~~~ | |
| 315 | ||
| 316 | Additionally, a handful of common comment syntaxes are defined in | |
| 317 | [`Data.SCargot.Comments`](https://hackage.haskell.org/package/s-cargot/docs/Data-SCargot-Comments.html), | |
| 318 | including C-style, Haskell-style, and generic scripting-language-style | |
| 319 | comments, so in practice, we could write the above example as | |
| 320 | ||
| 321 | ~~~~.haskell | |
| 322 | >>> decode (withCLikeLineComments basicParser) "(a //comment\n b)\n" | |
| 293 | 323 | Right [SCons (SAtom "a") (SCons (SAtom "b") SNil)] |
| 294 | 324 | ~~~~ |
| 295 | 325 | |