diff options
Diffstat (limited to 'serd')
| -rw-r--r-- | serd/serd.h | 450 |
1 files changed, 296 insertions, 154 deletions
diff --git a/serd/serd.h b/serd/serd.h index 9409e782..974d0c47 100644 --- a/serd/serd.h +++ b/serd/serd.h @@ -15,9 +15,9 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ -/** @file - * Public Serd API. - */ +/** + @file serd.h Public Serd API. +*/ #ifndef SERD_SERD_H #define SERD_SERD_H @@ -48,196 +48,299 @@ extern "C" { #endif -/** @defgroup serd Serd - * A lightweight RDF syntax library. - * @{ - */ - -typedef struct SerdEnvImpl* SerdEnv; /**< Namespace prefixes. */ -typedef struct SerdReaderImpl* SerdReader; /**< RDF reader. */ -typedef struct SerdWriterImpl* SerdWriter; /**< RDF writer. */ - -/** RDF syntax */ +/** + @defgroup serd Serd + A lightweight RDF syntax library. + @{ +*/ + +/** + Namespace prefixes. + + A SerdEnv represents a set of namespace prefixes, and is used to resolve + CURIEs to full URIs. +*/ +typedef struct SerdEnvImpl* SerdEnv; + +/** + RDF reader. + + A SerdReader parses RDF by reading some syntax and calling user-provided + sink functions as input is read (much like an XML SAX parser). +*/ +typedef struct SerdReaderImpl* SerdReader; + +/** + RDF writer. + + A SerdWriter provides a number of functions to allow writing RDF syntax out + to some stream. These functions are deliberately compatible with the sink + functions used by SerdReader, so a reader can be directly connected to a + writer to re-serialise a document. +*/ +typedef struct SerdWriterImpl* SerdWriter; + +/** + RDF syntax type. +*/ typedef enum { - SERD_TURTLE = 1, ///< <http://www.w3.org/TeamSubmission/turtle/> - SERD_NTRIPLES = 2 ///< <http://www.w3.org/TR/rdf-testcases/#ntriples> + /** + Turtle - Terse RDF Triple Language (UTF-8). + @see <a href="http://www.w3.org/TeamSubmission/turtle/">Turtle</a> + */ + SERD_TURTLE = 1, + + /** + NTriples - Line-based RDF triples (ASCII). + @see <a href="http://www.w3.org/TR/rdf-testcases#ntriples">NTriples</a> + */ + SERD_NTRIPLES = 2 } SerdSyntax; -/** Type of a syntactic RDF node. - * This is more precise than the type of an abstract RDF node. An abstract - * node is either a resource, literal, or blank. In syntax there are two - * ways to refer to a resource (URI or CURIE), and two ways to refer to a - * blank node (with a blank ID, or anonymously). Serd represents nodes as - * an unquoted UTF-8 string "value" associated with a @ref SerdType, - * which preserves syntactic information allowing for lossless abbreviation. - * A non-abbreviating sink may simply consider @ref SERD_ANON_BEGIN and - * @ref SERD_ANON equivalent to SERD_BLANK_ID. - */ +/** + Type of a syntactic RDF node. + + This is more precise than the type of an abstract RDF node. An abstract node + is either a resource, literal, or blank. In syntax there are two ways to + refer to both a resource (by URI or CURIE) and a blank (by ID or + anonymously). + + Serd represents all nodes as an unquoted UTF-8 string "value" associated + with a @ref SerdType, which is precise enough to preserve the syntactic + information required for streaming abbreviation. A non-abbreviating sink may + simply consider @ref SERD_ANON_BEGIN and @ref SERD_ANON equivalent to + @ref SERD_BLANK_ID. +*/ typedef enum { - /** The type of a NULL node. */ + /** + The type of a nonexistent node. + + This type is occasionally useful, but is never emitted by the reader. + */ SERD_NOTHING = 0, - /** Literal value. A literal optionally has either an associated language, - * or an associated datatype (not both). - */ + /** + Literal value. + + A literal optionally has either an associated language, or an associated + datatype (not both). + */ SERD_LITERAL = 1, - /** URI. Value is a valid URI string (either absolute or relative), which - * is valid universally. See <http://tools.ietf.org/html/rfc3986>. - */ + /** + URI (absolute or relative). + + Value is an unquoted URI string, which is either a relative reference + with respect to the current base URI, or an absolute URI. A URI is an ID + with universal scope. + @see <a href="http://tools.ietf.org/html/rfc3986">RFC3986</a>. + */ SERD_URI = 2, - /** CURIE, a shortened URI. Value is an unquoted UTF-8 CURIE string - * relative to the current environment, e.g. "rdf:type", which is valid - * only within this serialisation. See <http://www.w3.org/TR/curie>. - */ + /** + CURIE, a shortened URI. + + Value is an unquoted CURIE string relative to the current environment, + e.g. "rdf:type". + @see <a href="http://www.w3.org/TR/curie">CURIE Syntax 1.0</a> + */ SERD_CURIE = 3, - /** A blank node ID. Value is a blank node identifier (e.g. "blank3"), - * which is valid only within this serialisation. - * See <http://www.w3.org/TeamSubmission/turtle#nodeID>. - */ + /** + A blank node ID. + + Value is a blank node ID, e.g. "id3", which is valid only in this + serialisation. + @see <a href="http://www.w3.org/TeamSubmission/turtle#nodeID">Turtle + <tt>nodeID</tt></a> + */ SERD_BLANK_ID = 4, - /** The first reference to an anonymous (inlined) blank node. - * Value is identical to a @ref SERD_BLANK_ID value. - */ + /** + The first reference to an anonymous (inlined) blank node. + + Value is identical to a @ref SERD_BLANK_ID value (i.e. this type may be + safely considered equivalent to @ref SERD_BLANK_ID). + */ SERD_ANON_BEGIN = 5, - /** An anonymous blank node. - * Value is identical to a @ref SERD_BLANK_ID value. - */ + /** + An anonymous blank node. + + Value is identical to a @ref SERD_BLANK_ID value (i.e. this type may be + safely considered equivalent to @ref SERD_BLANK_ID). + */ SERD_ANON = 6 } SerdType; -/** @name SerdURI - * A parsed URI. - * @{ - */ +/** + @name SerdURI + @{ +*/ -/** An unterminated string fragment. */ +/** + An unterminated string fragment. +*/ typedef struct { - const uint8_t* buf; ///< Start of chunk - size_t len; ///< Length of chunk in bytes + const uint8_t* buf; /**< Start of chunk */ + size_t len; /**< Length of chunk in bytes */ } SerdChunk; -/** A parsed URI. - * This struct directly refers to chunks in other strings, it does not own - * any memory itself. Thus, URIs can be parsed and/or resolved against a - * base URI in-place without allocating memory. - */ +/** + A parsed URI. + + This struct directly refers to chunks in other strings, it does not own any + memory itself. Thus, URIs can be parsed and/or resolved against a base URI + in-place without allocating memory. +*/ typedef struct { - SerdChunk scheme; ///< Scheme - SerdChunk authority; ///< Authority - SerdChunk path_base; ///< Path prefix if relative - SerdChunk path; ///< Path suffix - SerdChunk query; ///< Query - SerdChunk fragment; ///< Fragment + SerdChunk scheme; /**< Scheme */ + SerdChunk authority; /**< Authority */ + SerdChunk path_base; /**< Path prefix if relative */ + SerdChunk path; /**< Path suffix */ + SerdChunk query; /**< Query */ + SerdChunk fragment; /**< Fragment */ } SerdURI; static const SerdURI SERD_URI_NULL = {{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}}; -/** Return true iff @a utf8 starts with a valid URI scheme. */ +/** + Return true iff @a utf8 starts with a valid URI scheme. +*/ SERD_API bool serd_uri_string_has_scheme(const uint8_t* utf8); -/** Parse @a utf8, writing result to @a out. */ +/** + Parse @a utf8, writing result to @a out. +*/ SERD_API bool serd_uri_parse(const uint8_t* utf8, SerdURI* out); -/** Set @a out to @a uri resolved against @a base. */ +/** + Set @a out to @a uri resolved against @a base. +*/ SERD_API void serd_uri_resolve(const SerdURI* uri, const SerdURI* base, SerdURI* out); -/** Sink function for raw string output. */ +/** + Sink function for raw string output. +*/ typedef size_t (*SerdSink)(const void* buf, size_t len, void* stream); -/** Serialise @a uri with a series of calls to @a sink. */ +/** + Serialise @a uri with a series of calls to @a sink. +*/ SERD_API size_t serd_uri_serialise(const SerdURI* uri, SerdSink sink, void* stream); -/** @} */ -/** @name SerdNode - * @brief An RDF node. - * @{ - */ +/** + @} + @name SerdNode + @{ +*/ -/** A syntactic RDF node. */ +/** + A syntactic RDF node. +*/ typedef struct { SerdType type; - size_t n_bytes; ///< Size in bytes including trailing null byte - size_t n_chars; ///< Length in characters - const uint8_t* buf; ///< Buffer + size_t n_bytes; /**< Size in bytes (including null) */ + size_t n_chars; /**< Length in characters */ + const uint8_t* buf; /**< Buffer */ } SerdNode; static const SerdNode SERD_NODE_NULL = { SERD_NOTHING, 0, 0, 0 }; -/** Make a (shallow) node from @a str. - * This measures, but does not copy, @a str. No memory is allocated. - */ +/** + Make a (shallow) node from @a str. + + This measures, but does not copy, @a str. No memory is allocated. +*/ SERD_API SerdNode serd_node_from_string(SerdType type, const uint8_t* str); -/** Make a deep copy of @a node. - * @return a node that the caller must free with @ref serd_node_free. - */ +/** + Make a deep copy of @a node. + + @return a node that the caller must free with @ref serd_node_free. +*/ SERD_API SerdNode serd_node_copy(const SerdNode* node); -/** Simple wrapper for serd_node_new_uri to resolve a URI node. */ +/** + Simple wrapper for serd_node_new_uri to resolve a URI node. +*/ SERD_API SerdNode serd_node_new_uri_from_node(const SerdNode* uri_node, const SerdURI* base, SerdURI* out); -/** Simple wrapper for serd_node_new_uri to resolve a URI string. */ +/** + Simple wrapper for serd_node_new_uri to resolve a URI string. +*/ SERD_API SerdNode serd_node_new_uri_from_string(const uint8_t* str, const SerdURI* base, SerdURI* out); -/** Create a new node by serialising @a uri into a new string. - * @param uri The URI to parse and serialise. - * @param base Base URI to resolve @a uri against (or NULL for no resolution). - * @param out (Output) set to the parsing of the new URI (i.e. points only to - * memory owned by the new returned node). - */ +/** + Create a new node by serialising @a uri into a new string. + + @param uri The URI to parse and serialise. + @param base Base URI to resolve @a uri against (or NULL for no resolution). + @param out (Output) set to the parsing of the new URI (i.e. points only to + memory owned by the new returned node). +*/ SERD_API SerdNode serd_node_new_uri(const SerdURI* uri, const SerdURI* base, SerdURI* out); -/** Free any data owned by @a node. - * Note that if @a node is itself dynamically allocated (which is not the case - * for nodes created internally by serd), it will not be freed. - */ +/** + Free any data owned by @a node. + + Note that if @a node is itself dynamically allocated (which is not the case + for nodes created internally by serd), it will not be freed. +*/ SERD_API void serd_node_free(SerdNode* node); -/** @} */ -/** @name SerdHandlers - * @brief Event handlers (user-provided worker functions). - * @{ - */ +/** + @} + @name Handlers + @{ +*/ -/** Sink for base URI changes. */ +/** + Sink for base URI changes. + + Called whenever the base URI of the serialisation changes. +*/ typedef bool (*SerdBaseSink)(void* handle, const SerdNode* uri); -/** Sink for namespace definitions. */ +/** + Sink for namespace definitions. + + Called whenever a prefix is defined in the serialisation. +*/ typedef bool (*SerdPrefixSink)(void* handle, const SerdNode* name, const SerdNode* uri); -/** Sink for statements. */ +/** + Sink for statements. + + Called for every RDF statement in the serialisation. +*/ typedef bool (*SerdStatementSink)(void* handle, const SerdNode* graph, const SerdNode* subject, @@ -246,30 +349,48 @@ typedef bool (*SerdStatementSink)(void* handle, const SerdNode* object_datatype, const SerdNode* object_lang); -/** @} */ -/** @name SerdEnv - * @brief An environment (a prefix => URI dictionary). - * @{ - */ +/** + Sink for anonymous node end markers. + + This is called to indicate that the anonymous node with the given + @a value will no longer be referred to by any future statements + (i.e. the anonymous serialisation of the node is finished). +*/ +typedef bool (*SerdEndSink)(void* handle, + const SerdNode* node); -/** Create a new environment. */ +/** + @} + @name SerdEnv + @{ +*/ + +/** + Create a new environment. +*/ SERD_API SerdEnv serd_env_new(); -/** Free @a ns. */ +/** + Free @a ns. +*/ SERD_API void serd_env_free(SerdEnv env); -/** Add namespace @a uri to @a ns using prefix @a name. */ +/** + Add namespace @a uri to @a ns using prefix @a name. +*/ SERD_API void serd_env_add(SerdEnv env, const SerdNode* name, const SerdNode* uri); -/** Qualify @a into a CURIE if possible. */ +/** + Qualify @a into a CURIE if possible. +*/ SERD_API bool serd_env_qualify(const SerdEnv env, @@ -277,7 +398,9 @@ serd_env_qualify(const SerdEnv env, SerdNode* prefix, SerdChunk* suffix); -/** Expand @a curie. */ +/** + Expand @a curie. +*/ SERD_API bool serd_env_expand(const SerdEnv env, @@ -285,28 +408,24 @@ serd_env_expand(const SerdEnv env, SerdChunk* uri_prefix, SerdChunk* uri_suffix); -/** Call @a func for each prefix defined in @a env. */ +/** + Call @a func for each prefix defined in @a env. +*/ SERD_API void serd_env_foreach(const SerdEnv env, SerdPrefixSink func, void* handle); -/** @} */ -/** @name SerdReader - * @brief Reader of RDF syntax. - * @{ - */ +/** + @} + @name SerdReader + @{ +*/ -/** Sink for anonymous node end markers. - * This is called to indicate that the anonymous node with the given - * @a value will no longer be referred to by any future statements - * (i.e. the anonymous serialisation of the node is finished). - */ -typedef bool (*SerdEndSink)(void* handle, - const SerdNode* node); - -/** Create a new RDF reader. */ +/** + Create a new RDF reader. +*/ SERD_API SerdReader serd_reader_new(SerdSyntax syntax, @@ -316,40 +435,48 @@ serd_reader_new(SerdSyntax syntax, SerdStatementSink statement_sink, SerdEndSink end_sink); -/** Set a prefix to be added to all blank node identifiers. - * This is useful when multiple files are to be parsed into the same output - * (e.g. a store, or other files). Since Serd preserves blank node IDs, this - * could cause conflicts where two non-equivalent blank nodes are merged, - * resulting in corrupt data. By setting a unique blank node prefix for - * each parsed file, this can be avoided, while preserving blank node names. - */ +/** + Set a prefix to be added to all blank node identifiers. + + This is useful when multiple files are to be parsed into the same output + (e.g. a store, or other files). Since Serd preserves blank node IDs, this + could cause conflicts where two non-equivalent blank nodes are merged, + resulting in corrupt data. By setting a unique blank node prefix for each + parsed file, this can be avoided, while preserving blank node names. +*/ SERD_API void serd_reader_set_blank_prefix(SerdReader reader, const uint8_t* prefix); -/** Read @a file. */ +/** + Read @a file. +*/ SERD_API bool serd_reader_read_file(SerdReader reader, FILE* file, const uint8_t* name); -/** Read @a utf8. */ +/** + Read @a utf8. +*/ SERD_API bool serd_reader_read_string(SerdReader me, const uint8_t* utf8); -/** Free @a reader. */ +/** + Free @a reader. +*/ SERD_API void serd_reader_free(SerdReader reader); -/** @} */ -/** @name SerdWriter - * @brief Writer of RDF syntax. - * @{ - */ +/** + @} + @name SerdWriter + @{ +*/ typedef enum { SERD_STYLE_ABBREVIATED = 1, /**< Abbreviate triples when possible. */ @@ -358,7 +485,9 @@ typedef enum { SERD_STYLE_CURIED = 1 << 3 /**< Shorted URIs into CURIEs. */ } SerdStyle; -/** Create a new RDF writer. */ +/** + Create a new RDF writer. +*/ SERD_API SerdWriter serd_writer_new(SerdSyntax syntax, @@ -368,25 +497,33 @@ serd_writer_new(SerdSyntax syntax, SerdSink sink, void* stream); -/** Free @a writer. */ +/** + Free @a writer. +*/ SERD_API void serd_writer_free(SerdWriter writer); -/** Set the current output base URI (and emit directive if applicable). */ +/** + Set the current output base URI (and emit directive if applicable). +*/ SERD_API void serd_writer_set_base_uri(SerdWriter writer, const SerdURI* uri); -/** Set a namespace prefix (and emit directive if applicable). */ +/** + Set a namespace prefix (and emit directive if applicable). +*/ SERD_API bool serd_writer_set_prefix(SerdWriter writer, const SerdNode* name, const SerdNode* uri); -/** Write a statement. */ +/** + Write a statement. +*/ SERD_API bool serd_writer_write_statement(SerdWriter writer, @@ -397,20 +534,25 @@ serd_writer_write_statement(SerdWriter writer, const SerdNode* object_datatype, const SerdNode* object_lang); -/** Mark the end of an anonymous node's description. */ +/** + Mark the end of an anonymous node's description. +*/ SERD_API bool serd_writer_end_anon(SerdWriter writer, const SerdNode* node); -/** Finish a write. */ +/** + Finish a write. +*/ SERD_API void serd_writer_finish(SerdWriter writer); -/** @} */ - -/** @} */ +/** + @} + @} +*/ #ifdef __cplusplus } /* extern "C" */ |