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readNGF now fails if the file doesn't exist. Instead there is newNGF

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This commit is contained in:
krangelov
2021-09-16 10:34:51 +02:00
parent 3d0450cb2a
commit a79fff548d
4 changed files with 79 additions and 29 deletions
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65
src/runtime/c/pgf/pgf.cxx
View File

@@ -118,31 +118,13 @@ PgfDB *pgf_read_ngf(const char *fpath,
bool is_new = false;
PGF_API_BEGIN {
db = new PgfDB(fpath, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
db = new PgfDB(fpath, O_RDWR, 0);
{
DB_scope scope(db, WRITER_SCOPE);
ref<PgfPGF> pgf = PgfDB::get_revision(&master);
if (pgf == 0) {
is_new = true;
pgf = PgfDB::malloc<PgfPGF>(master.size+1);
pgf->ref_count = 1;
pgf->major_version = PGF_MAJOR_VERSION;
pgf->minor_version = PGF_MINOR_VERSION;
pgf->gflags = 0;
pgf->abstract.name = PgfDB::malloc<PgfText>();
pgf->abstract.name->size = 0;
pgf->abstract.aflags = 0;
pgf->abstract.funs = 0;
pgf->abstract.cats = 0;
pgf->prev = 0;
pgf->next = 0;
memcpy(&pgf->name, &master, sizeof(PgfText)+master.size+1);
PgfDB::set_revision(pgf);
} else {
Node<PgfPGF>::add_value_ref(pgf);
}
Node<PgfPGF>::add_value_ref(pgf);
*revision = pgf.as_object();
}
@@ -158,6 +140,49 @@ PgfDB *pgf_read_ngf(const char *fpath,
return NULL;
}
PGF_API
PgfDB *pgf_new_ngf(PgfText *abstract_name,
const char *fpath,
PgfRevision *revision,
PgfExn* err)
{
PgfDB *db = NULL;
PGF_API_BEGIN {
db = new PgfDB(fpath, O_CREAT | O_EXCL | O_RDWR, S_IRUSR | S_IWUSR);
{
DB_scope scope(db, WRITER_SCOPE);
ref<PgfPGF> pgf = PgfDB::malloc<PgfPGF>(master.size+1);
pgf->ref_count = 1;
pgf->major_version = PGF_MAJOR_VERSION;
pgf->minor_version = PGF_MINOR_VERSION;
pgf->gflags = 0;
pgf->abstract.name = PgfDB::malloc<PgfText>(abstract_name->size+1);
memcpy(&(*pgf->abstract.name), abstract_name, sizeof(PgfText)+abstract_name->size+1);
pgf->abstract.aflags = 0;
pgf->abstract.funs = 0;
pgf->abstract.cats = 0;
pgf->prev = 0;
pgf->next = 0;
memcpy(&pgf->name, &master, sizeof(PgfText)+master.size+1);
PgfDB::set_revision(pgf);
*revision = pgf.as_object();
}
return db;
} PGF_API_END
if (db != NULL) {
delete db;
if (fpath != NULL)
remove(fpath);
}
return NULL;
}
PGF_API
void pgf_write_pgf(const char* fpath,
PgfDB *db, PgfRevision revision,

16
src/runtime/c/pgf/pgf.h
View File

@@ -237,15 +237,23 @@ PgfDB *pgf_boot_ngf(const char* pgf_path, const char* ngf_path,
PgfExn* err);
/* Tries to read the grammar from an already booted NGF file.
* If the file does not exist then a new one is created, and the
* grammar is set to be empty. It can later be populated with
* rules dynamically. The default grammar revision is stored
* in *revision. */
* The function fails if the file does not exist. The default grammar
* revision is stored in *revision. */
PGF_API_DECL
PgfDB *pgf_read_ngf(const char* fpath,
PgfRevision *revision,
PgfExn* err);
/* Creates a new NGF file with a grammar with the given abstract_name.
* Aside from the name, the grammar is otherwise empty but can be later
* populated with new functions and categories. If fpath is NULL then
* the file is not stored on the disk but only in memory. */
PGF_API
PgfDB *pgf_new_ngf(PgfText *abstract_name,
const char *fpath,
PgfRevision *revision,
PgfExn* err);
PGF_API_DECL
void pgf_write_pgf(const char* fpath,
PgfDB *db, PgfRevision revision,