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Add mpc_checkf and mpc_check_withf combinators.

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Jerome M. BERGER
2018-04-03 14:53:13 +02:00
parent dfda9d3bd6
commit a63bedc74a
4 changed files with 72 additions and 0 deletions
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README.md
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@@ -314,6 +314,8 @@ Returns a parser that applies function `f` (optionality taking extra input `x`)
```c
mpc_parser_t *mpc_check(mpc_parser_t *a, mpc_check_t f, const char *e);
mpc_parser_t *mpc_check_with(mpc_parser_t *a, mpc_check_with_t f, void *x, const char *e);
mpc_parser_t *mpc_checkf(mpc_parser_t *a, mpc_check_t f, const char *fmt, ...);
mpc_parser_t *mpc_check_withf(mpc_parser_t *a, mpc_check_with_t f, void *x, const char *fmt, ...);
```
Returns a parser that applies function `f` (optionally taking extra input `x`) to the result of parser `a`. If `f` returns non-zero, then the parser succeeds and returns the value of `a` (possibly modified by `f`). If `f` returns zero, then the parser fails with message `e`.