diff options
Diffstat (limited to 'src/statement.c')
-rw-r--r-- | src/statement.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/statement.c b/src/statement.c new file mode 100644 index 00000000..51788e05 --- /dev/null +++ b/src/statement.c @@ -0,0 +1,134 @@ +/* + Copyright 2011-2020 David Robillard <d@drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#include "statement.h" + +#include "caret.h" + +#include <assert.h> +#include <stdbool.h> +#include <stdlib.h> +#include <string.h> + +static bool +is_resource(const SerdNode* const node) +{ + const SerdNodeType type = serd_node_type(node); + + return type == SERD_URI || type == SERD_CURIE || type == SERD_BLANK; +} + +bool +serd_statement_is_valid(const SerdNode* const subject, + const SerdNode* const predicate, + const SerdNode* const object, + const SerdNode* const graph) +{ + return subject && predicate && object && is_resource(subject) && + is_resource(predicate) && serd_node_type(predicate) != SERD_BLANK && + (!graph || is_resource(graph)); +} + +SerdStatement* +serd_statement_new(const SerdNode* const s, + const SerdNode* const p, + const SerdNode* const o, + const SerdNode* const g, + const SerdCaret* const caret) +{ + assert(serd_statement_is_valid(s, p, o, g)); + + SerdStatement* statement = (SerdStatement*)malloc(sizeof(SerdStatement)); + if (statement) { + statement->nodes[0] = s; + statement->nodes[1] = p; + statement->nodes[2] = o; + statement->nodes[3] = g; + statement->caret = serd_caret_copy(caret); + } + return statement; +} + +SerdStatement* +serd_statement_copy(const SerdStatement* const statement) +{ + if (!statement) { + return NULL; + } + + SerdStatement* copy = (SerdStatement*)malloc(sizeof(SerdStatement)); + memcpy(copy, statement, sizeof(SerdStatement)); + if (statement->caret) { + copy->caret = (SerdCaret*)malloc(sizeof(SerdCaret)); + memcpy(copy->caret, statement->caret, sizeof(SerdCaret)); + } + return copy; +} + +void +serd_statement_free(SerdStatement* const statement) +{ + if (statement) { + free(statement->caret); + free(statement); + } +} + +const SerdNode* +serd_statement_node(const SerdStatement* const statement, const SerdField field) +{ + return statement->nodes[field]; +} + +const SerdNode* +serd_statement_subject(const SerdStatement* const statement) +{ + return statement->nodes[SERD_SUBJECT]; +} + +const SerdNode* +serd_statement_predicate(const SerdStatement* const statement) +{ + return statement->nodes[SERD_PREDICATE]; +} + +const SerdNode* +serd_statement_object(const SerdStatement* const statement) +{ + return statement->nodes[SERD_OBJECT]; +} + +const SerdNode* +serd_statement_graph(const SerdStatement* const statement) +{ + return statement->nodes[SERD_GRAPH]; +} + +const SerdCaret* +serd_statement_caret(const SerdStatement* const statement) +{ + return statement->caret; +} + +bool +serd_statement_equals(const SerdStatement* const a, + const SerdStatement* const b) +{ + return (a == b || (a && b && serd_node_equals(a->nodes[0], b->nodes[0]) && + serd_node_equals(a->nodes[1], b->nodes[1]) && + serd_node_equals(a->nodes[2], b->nodes[2]) && + serd_node_equals(a->nodes[3], b->nodes[3]))); +} |