Mercurial > lbo > hg > ylisp
changeset 74:d5330e2b1488
value: Implement yvalue_clone()
| author | Lewin Bormann <lbo@spheniscida.de> |
|---|---|
| date | Sun, 25 Aug 2019 18:46:06 +0200 |
| parents | 7a5caf93cdc2 |
| children | a7569b66b12a |
| files | src/value.c src/value.h |
| diffstat | 2 files changed, 19 insertions(+), 0 deletions(-) [+] |
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--- a/src/value.c Sun Aug 25 18:45:46 2019 +0200 +++ b/src/value.c Sun Aug 25 18:46:06 2019 +0200 @@ -79,6 +79,19 @@ return ref; } +yref_t yvalue_clone(yref_t* ref) { + yvalue_t* orig = yvalue_get(*ref); + assert(orig->typ == YVALUE_EXPR || orig->typ == YVALUE_FUNC); + if (orig->typ == YVALUE_FUNC) { + // Functions are immutable for now. + return *ref; + } else if (orig->typ == YVALUE_EXPR) { + yvalue_t new = { .typ = YVALUE_EXPR, .value.expr = yexpr_copy(&orig->value.expr) }; + return yvalue_set(YVALUE_INSERT, &new); + } + return yref_new_id(YVALUE_INVALID_ID); +} + ystr_t yref_debug(yref_t* ref) { YREF_TYPE typ = yref_type(ref); if (typ == YREF_ID) {
--- a/src/value.h Sun Aug 25 18:45:46 2019 +0200 +++ b/src/value.h Sun Aug 25 18:46:06 2019 +0200 @@ -76,6 +76,12 @@ void yref_destroy(yref_t* ref); /** + * @brief Copies the contents of a reference to a new slot and returns a new + * reference. (not for functions, which are immutable for now) + */ +yref_t yvalue_clone(yref_t* ref); + +/** * @brief A value with a name, stored in the global value table to be referenced * by name or ID. To be used as pointer (not value). *