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| -rw-r--r-- | include/serd/serd.h | 1098 |
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diff --git a/include/serd/serd.h b/include/serd/serd.h new file mode 100644 index 00000000..c1e8ba8e --- /dev/null +++ b/include/serd/serd.h @@ -0,0 +1,1098 @@ +/* + Copyright 2011-2020 David Robillard <http://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. +*/ + +/** + @file serd.h API for Serd, a lightweight RDF syntax library. +*/ + +#ifndef SERD_SERD_H +#define SERD_SERD_H + +#include <stdarg.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> + +#ifdef SERD_SHARED +# ifdef _WIN32 +# define SERD_LIB_IMPORT __declspec(dllimport) +# define SERD_LIB_EXPORT __declspec(dllexport) +# else +# define SERD_LIB_IMPORT __attribute__((visibility("default"))) +# define SERD_LIB_EXPORT __attribute__((visibility("default"))) +# endif +# ifdef SERD_INTERNAL +# define SERD_API SERD_LIB_EXPORT +# else +# define SERD_API SERD_LIB_IMPORT +# endif +#else +# define SERD_API +#endif + +#ifdef __cplusplus +extern "C" { +# if defined(__GNUC__) +# pragma GCC diagnostic push +# pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant" +# endif +#endif + +/** + @defgroup serd Serd + A lightweight RDF syntax library. + @{ +*/ + +/** + Environment. + + Represents the state required to resolve a CURIE or relative URI, e.g. the + base URI and set of namespace prefixes at a particular point. +*/ +typedef struct SerdEnvImpl SerdEnv; + +/** + RDF reader. + + Parses RDF by calling user-provided sink functions as input is consumed + (much like an XML SAX parser). +*/ +typedef struct SerdReaderImpl SerdReader; + +/** + RDF writer. + + 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 with minimal overhead. +*/ +typedef struct SerdWriterImpl SerdWriter; + +/** + Return status code. +*/ +typedef enum { + SERD_SUCCESS, /**< No error */ + SERD_FAILURE, /**< Non-fatal failure */ + SERD_ERR_UNKNOWN, /**< Unknown error */ + SERD_ERR_BAD_SYNTAX, /**< Invalid syntax */ + SERD_ERR_BAD_ARG, /**< Invalid argument */ + SERD_ERR_NOT_FOUND, /**< Not found */ + SERD_ERR_ID_CLASH, /**< Encountered clashing blank node IDs */ + SERD_ERR_BAD_CURIE, /**< Invalid CURIE (e.g. prefix does not exist) */ + SERD_ERR_INTERNAL /**< Unexpected internal error (should not happen) */ +} SerdStatus; + +/** + RDF syntax type. +*/ +typedef enum { + /** + 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, + + /** + NQuads - Line-based RDF quads (UTF-8). + @see <a href="https://www.w3.org/TR/n-quads/">NQuads</a> + */ + SERD_NQUADS = 3, + + /** + TriG - Terse RDF quads (UTF-8). + @see <a href="https://www.w3.org/TR/trig/">Trig</a> + */ + SERD_TRIG = 4 +} SerdSyntax; + +/** + Flags indicating inline abbreviation information for a statement. +*/ +typedef enum { + SERD_EMPTY_S = 1 << 1, /**< Empty blank node subject */ + SERD_EMPTY_O = 1 << 2, /**< Empty blank node object */ + SERD_ANON_S_BEGIN = 1 << 3, /**< Start of anonymous subject */ + SERD_ANON_O_BEGIN = 1 << 4, /**< Start of anonymous object */ + SERD_ANON_CONT = 1 << 5, /**< Continuation of anonymous node */ + SERD_LIST_S_BEGIN = 1 << 6, /**< Start of list subject */ + SERD_LIST_O_BEGIN = 1 << 7, /**< Start of list object */ + SERD_LIST_CONT = 1 << 8 /**< Continuation of list */ +} SerdStatementFlag; + +/** + Bitwise OR of SerdStatementFlag values. +*/ +typedef uint32_t SerdStatementFlags; + +/** + 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 (by URI or CURIE) and two ways to refer to a blank + (by ID or anonymously). Anonymous (inline) blank nodes are expressed using + SerdStatementFlags rather than this type. +*/ +typedef enum { + /** + The type of a nonexistent node. + + This type is useful as a sentinel, but is never emitted by the reader. + */ + SERD_NOTHING = 0, + + /** + Literal value. + + A literal optionally has either a language, or a datatype (not both). + */ + SERD_LITERAL = 1, + + /** + URI (absolute or relative). + + Value is an unquoted URI string, which is either a relative reference + with respect to the current base URI (e.g. "foo/bar"), or an absolute + URI (e.g. "http://example.org/foo"). + @see <a href="http://tools.ietf.org/html/rfc3986">RFC3986</a>. + */ + SERD_URI = 2, + + /** + 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. + + Value is a blank node ID, e.g. "id3", which is meaningful only within + this serialisation. + @see <a href="http://www.w3.org/TeamSubmission/turtle#nodeID">Turtle + <tt>nodeID</tt></a> + */ + SERD_BLANK = 4 +} SerdType; + +/** + Flags indicating certain string properties relevant to serialisation. +*/ +typedef enum { + SERD_HAS_NEWLINE = 1, /**< Contains line breaks ('\\n' or '\\r') */ + SERD_HAS_QUOTE = 1 << 1 /**< Contains quotes ('"') */ +} SerdNodeFlag; + +/** + Bitwise OR of SerdNodeFlag values. +*/ +typedef uint32_t SerdNodeFlags; + +/** + A syntactic RDF node. +*/ +typedef struct { + const uint8_t* buf; /**< Value string */ + size_t n_bytes; /**< Size in bytes (not including null) */ + size_t n_chars; /**< Length in characters (not including null)*/ + SerdNodeFlags flags; /**< Node flags (e.g. string properties) */ + SerdType type; /**< Node type */ +} SerdNode; + +/** + An unterminated string fragment. +*/ +typedef struct { + const uint8_t* buf; /**< Start of chunk */ + size_t len; /**< Length of chunk in bytes */ +} SerdChunk; + +/** + An error description. +*/ +typedef struct { + SerdStatus status; /**< Error code */ + const uint8_t* filename; /**< File where error was encountered, or NULL */ + unsigned line; /**< Line where error was encountered, or 0 */ + unsigned col; /**< Column where error was encountered */ + const char* fmt; /**< Message format string (printf style) */ + va_list* args; /**< Arguments for fmt */ +} SerdError; + +/** + 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 */ +} SerdURI; + +/** + Syntax style options. + + The style of the writer output can be controlled by ORing together + values from this enumeration. Note that some options are only supported + for some syntaxes (e.g. NTriples does not support abbreviation and is + always ASCII). +*/ +typedef enum { + SERD_STYLE_ABBREVIATED = 1, /**< Abbreviate triples when possible. */ + SERD_STYLE_ASCII = 1 << 1, /**< Escape all non-ASCII characters. */ + SERD_STYLE_RESOLVED = 1 << 2, /**< Resolve URIs against base URI. */ + SERD_STYLE_CURIED = 1 << 3, /**< Shorten URIs into CURIEs. */ + SERD_STYLE_BULK = 1 << 4 /**< Write output in pages. */ +} SerdStyle; + +/** + Free memory allocated by Serd. + + This function exists because some systems require memory allocated by a + library to be freed by code in the same library. It is otherwise equivalent + to the standard C free() function. +*/ +SERD_API +void +serd_free(void* ptr); + +/** + @name String Utilities + @{ +*/ + +/** + Return a string describing a status code. +*/ +SERD_API +const uint8_t* +serd_strerror(SerdStatus status); + +/** + Measure a UTF-8 string. + @return Length of `str` in characters (except NULL). + @param str A null-terminated UTF-8 string. + @param n_bytes (Output) Set to the size of `str` in bytes (except NULL). + @param flags (Output) Set to the applicable flags. +*/ +SERD_API +size_t +serd_strlen(const uint8_t* str, size_t* n_bytes, SerdNodeFlags* flags); + +/** + Parse a string to a double. + + The API of this function is identical to the standard C strtod function, + except this function is locale-independent and always matches the lexical + format used in the Turtle grammar (the decimal point is always "."). +*/ +SERD_API +double +serd_strtod(const char* str, char** endptr); + +/** + Decode a base64 string. + This function can be used to deserialise a blob node created with + serd_node_new_blob(). + + @param str Base64 string to decode. + @param len The length of `str`. + @param size Set to the size of the returned blob in bytes. + @return A newly allocated blob which must be freed with serd_free(). +*/ +SERD_API +void* +serd_base64_decode(const uint8_t* str, size_t len, size_t* size); + +/** + @} + @name Byte Streams + @{ +*/ + +/** + Function to detect I/O stream errors. + + Identical semantics to `ferror`. + + @return Non-zero if `stream` has encountered an error. +*/ +typedef int (*SerdStreamErrorFunc)(void* stream); + +/** + Source function for raw string input. + + Identical semantics to `fread`, but may set errno for more informative error + reporting than supported by SerdStreamErrorFunc. + + @param buf Output buffer. + @param size Size of a single element of data in bytes (always 1). + @param nmemb Number of elements to read. + @param stream Stream to read from (FILE* for fread). + @return Number of elements (bytes) read. +*/ +typedef size_t (*SerdSource)(void* buf, + size_t size, + size_t nmemb, + void* stream); + +/** + Sink function for raw string output. +*/ +typedef size_t (*SerdSink)(const void* buf, size_t len, void* stream); + +/** + @} + @name URI + @{ +*/ + +static const SerdURI SERD_URI_NULL = { + {NULL, 0}, {NULL, 0}, {NULL, 0}, {NULL, 0}, {NULL, 0}, {NULL, 0} +}; + +/** + Return the local path for `uri`, or NULL if `uri` is not a file URI. + Note this (inappropriately named) function only removes the file scheme if + necessary, and returns `uri` unmodified if it is an absolute path. Percent + encoding and other issues are not handled, to properly convert a file URI to + a path, use serd_file_uri_parse(). +*/ +SERD_API +const uint8_t* +serd_uri_to_path(const uint8_t* uri); + +/** + Get the unescaped path and hostname from a file URI. + @param uri A file URI. + @param hostname If non-NULL, set to the hostname, if present. + @return The path component of the URI. + + The returned path and `*hostname` must be freed with serd_free(). +*/ +SERD_API +uint8_t* +serd_file_uri_parse(const uint8_t* uri, uint8_t** hostname); + +/** + Return true iff `utf8` starts with a valid URI scheme. +*/ +SERD_API +bool +serd_uri_string_has_scheme(const uint8_t* utf8); + +/** + Parse `utf8`, writing result to `out`. +*/ +SERD_API +SerdStatus +serd_uri_parse(const uint8_t* utf8, SerdURI* out); + +/** + Set target `t` to reference `r` resolved against `base`. + + @see http://tools.ietf.org/html/rfc3986#section-5.2.2 +*/ +SERD_API +void +serd_uri_resolve(const SerdURI* r, const SerdURI* base, SerdURI* t); + +/** + Serialise `uri` with a series of calls to `sink`. +*/ +SERD_API +size_t +serd_uri_serialise(const SerdURI* uri, SerdSink sink, void* stream); + +/** + Serialise `uri` relative to `base` with a series of calls to `sink`. + + The `uri` is written as a relative URI iff if it a child of `base` and @c + root. The optional `root` parameter must be a prefix of `base` and can be + used keep up-references ("../") within a certain namespace. +*/ +SERD_API +size_t +serd_uri_serialise_relative(const SerdURI* uri, + const SerdURI* base, + const SerdURI* root, + SerdSink sink, + void* stream); + +/** + @} + @name Node + @{ +*/ + +static const SerdNode SERD_NODE_NULL = { NULL, 0, 0, 0, SERD_NOTHING }; + +/** + Make a (shallow) node from `str`. + + This measures, but does not copy, `str`. No memory is allocated. +*/ +SERD_API +SerdNode +serd_node_from_string(SerdType type, const uint8_t* str); + +/** + Make a (shallow) node from a prefix of `str`. + + This measures, but does not copy, `str`. No memory is allocated. + Note that the returned node may not be null terminated. +*/ +SERD_API +SerdNode +serd_node_from_substring(SerdType type, const uint8_t* str, size_t len); + +/** + 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. +*/ +SERD_API +SerdNode +serd_node_new_uri_from_string(const uint8_t* str, + const SerdURI* base, + SerdURI* out); + +/** + Create a new file URI node from a file system path and optional hostname. + + Backslashes in Windows paths will be converted and '%' will always be + percent encoded. If `escape` is true, all other invalid characters will be + percent encoded as well. + + If `path` is relative, `hostname` is ignored. + If `out` is not NULL, it will be set to the parsed URI. +*/ +SERD_API +SerdNode +serd_node_new_file_uri(const uint8_t* path, + const uint8_t* hostname, + SerdURI* out, + bool escape); + +/** + Create a new node by serialising `uri` into a new string. + + @param uri The URI to serialise. + + @param base Base URI to resolve `uri` against (or NULL for no resolution). + + @param out 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); + +/** + Create a new node by serialising `uri` into a new relative URI. + + @param uri The URI to serialise. + + @param base Base URI to make `uri` relative to, if possible. + + @param root Root URI for resolution (see serd_uri_serialise_relative()). + + @param out 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_relative_uri(const SerdURI* uri, + const SerdURI* base, + const SerdURI* root, + SerdURI* out); + +/** + Create a new node by serialising `d` into an xsd:decimal string. + + The resulting node will always contain a `.', start with a digit, and end + with a digit (i.e. will have a leading and/or trailing `0' if necessary). + It will never be in scientific notation. A maximum of `frac_digits` digits + will be written after the decimal point, but trailing zeros will + automatically be omitted (except one if `d` is a round integer). + + Note that about 16 and 8 fractional digits are required to precisely + represent a double and float, respectively. + + @param d The value for the new node. + @param frac_digits The maximum number of digits after the decimal place. +*/ +SERD_API +SerdNode +serd_node_new_decimal(double d, unsigned frac_digits); + +/** + Create a new node by serialising `i` into an xsd:integer string. +*/ +SERD_API +SerdNode +serd_node_new_integer(int64_t i); + +/** + Create a node by serialising `buf` into an xsd:base64Binary string. + This function can be used to make a serialisable node out of arbitrary + binary data, which can be decoded using serd_base64_decode(). + + @param buf Raw binary input data. + @param size Size of `buf`. + @param wrap_lines Wrap lines at 76 characters to conform to RFC 2045. +*/ +SERD_API +SerdNode +serd_node_new_blob(const void* buf, size_t size, bool wrap_lines); + +/** + Make a deep copy of `node`. + + @return a node that the caller must free with serd_node_free(). +*/ +SERD_API +SerdNode +serd_node_copy(const SerdNode* node); + +/** + Return true iff `a` is equal to `b`. +*/ +SERD_API +bool +serd_node_equals(const SerdNode* a, const SerdNode* b); + +/** + Free any data owned by `node`. + + Note that if `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 Event Handlers + @{ +*/ + +/** + Sink (callback) for errors. + + @param handle Handle for user data. + @param error Error description. +*/ +typedef SerdStatus (*SerdErrorSink)(void* handle, + const SerdError* error); + +/** + Sink (callback) for base URI changes. + + Called whenever the base URI of the serialisation changes. +*/ +typedef SerdStatus (*SerdBaseSink)(void* handle, + const SerdNode* uri); + +/** + Sink (callback) for namespace definitions. + + Called whenever a prefix is defined in the serialisation. +*/ +typedef SerdStatus (*SerdPrefixSink)(void* handle, + const SerdNode* name, + const SerdNode* uri); + +/** + Sink (callback) for statements. + + Called for every RDF statement in the serialisation. +*/ +typedef SerdStatus (*SerdStatementSink)(void* handle, + SerdStatementFlags flags, + const SerdNode* graph, + const SerdNode* subject, + const SerdNode* predicate, + const SerdNode* object, + const SerdNode* object_datatype, + const SerdNode* object_lang); + +/** + Sink (callback) for anonymous node end markers. + + This is called to indicate that the anonymous node with the given + `value` will no longer be referred to by any future statements + (i.e. the anonymous serialisation of the node is finished). +*/ +typedef SerdStatus (*SerdEndSink)(void* handle, + const SerdNode* node); + +/** + @} + @name Environment + @{ +*/ + +/** + Create a new environment. +*/ +SERD_API +SerdEnv* +serd_env_new(const SerdNode* base_uri); + +/** + Free `ns`. +*/ +SERD_API +void +serd_env_free(SerdEnv* env); + +/** + Get the current base URI. +*/ +SERD_API +const SerdNode* +serd_env_get_base_uri(const SerdEnv* env, + SerdURI* out); + +/** + Set the current base URI. +*/ +SERD_API +SerdStatus +serd_env_set_base_uri(SerdEnv* env, + const SerdNode* uri); + +/** + Set a namespace prefix. +*/ +SERD_API +SerdStatus +serd_env_set_prefix(SerdEnv* env, + const SerdNode* name, + const SerdNode* uri); + +/** + Set a namespace prefix. +*/ +SERD_API +SerdStatus +serd_env_set_prefix_from_strings(SerdEnv* env, + const uint8_t* name, + const uint8_t* uri); + +/** + Qualify `uri` into a CURIE if possible. +*/ +SERD_API +bool +serd_env_qualify(const SerdEnv* env, + const SerdNode* uri, + SerdNode* prefix, + SerdChunk* suffix); + +/** + Expand `curie`. + + Errors: SERD_ERR_BAD_ARG if `curie` is not valid, or SERD_ERR_BAD_CURIE if + prefix is not defined in `env`. +*/ +SERD_API +SerdStatus +serd_env_expand(const SerdEnv* env, + const SerdNode* curie, + SerdChunk* uri_prefix, + SerdChunk* uri_suffix); + +/** + Expand `node`, which must be a CURIE or URI, to a full URI. + + Returns null if `node` can not be expanded. +*/ +SERD_API +SerdNode +serd_env_expand_node(const SerdEnv* env, + const SerdNode* node); + +/** + Call `func` for each prefix defined in `env`. +*/ +SERD_API +void +serd_env_foreach(const SerdEnv* env, + SerdPrefixSink func, + void* handle); + +/** + @} + @name Reader + @{ +*/ + +/** + Create a new RDF reader. +*/ +SERD_API +SerdReader* +serd_reader_new(SerdSyntax syntax, + void* handle, + void (*free_handle)(void*), + SerdBaseSink base_sink, + SerdPrefixSink prefix_sink, + SerdStatementSink statement_sink, + SerdEndSink end_sink); + +/** + Enable or disable strict parsing. + + The reader is non-strict (lax) by default, which will tolerate URIs with + invalid characters. Setting strict will fail when parsing such files. An + error is printed for invalid input in either case. +*/ +SERD_API +void +serd_reader_set_strict(SerdReader* reader, bool strict); + +/** + Set a function to be called when errors occur during reading. + + The `error_sink` will be called with `handle` as its first argument. If + no error function is set, errors are printed to stderr in GCC style. +*/ +SERD_API +void +serd_reader_set_error_sink(SerdReader* reader, + SerdErrorSink error_sink, + void* error_handle); + +/** + Return the `handle` passed to serd_reader_new(). +*/ +SERD_API +void* +serd_reader_get_handle(const SerdReader* reader); + +/** + 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_add_blank_prefix(SerdReader* reader, + const uint8_t* prefix); + +/** + Set the URI of the default graph. + + If this is set, the reader will emit quads with the graph set to the given + node for any statements that are not in a named graph (which is currently + all of them since Serd currently does not support any graph syntaxes). +*/ +SERD_API +void +serd_reader_set_default_graph(SerdReader* reader, + const SerdNode* graph); + +/** + Read a file at a given `uri`. +*/ +SERD_API +SerdStatus +serd_reader_read_file(SerdReader* reader, + const uint8_t* uri); + +/** + Start an incremental read from a file handle. + + Iff `bulk` is true, `file` will be read a page at a time. This is more + efficient, but uses a page of memory and means that an entire page of input + must be ready before any callbacks will fire. To react as soon as input + arrives, set `bulk` to false. +*/ +SERD_API +SerdStatus +serd_reader_start_stream(SerdReader* reader, + FILE* file, + const uint8_t* name, + bool bulk); + +/** + Start an incremental read from a user-specified source. + + The `read_func` is guaranteed to only be called for `page_size` elements + with size 1 (i.e. `page_size` bytes). +*/ +SERD_API +SerdStatus +serd_reader_start_source_stream(SerdReader* reader, + SerdSource read_func, + SerdStreamErrorFunc error_func, + void* stream, + const uint8_t* name, + size_t page_size); + +/** + Read a single "chunk" of data during an incremental read. + + This function will read a single top level description, and return. This + may be a directive, statement, or several statements; essentially it reads + until a '.' is encountered. This is particularly useful for reading + directly from a pipe or socket. +*/ +SERD_API +SerdStatus +serd_reader_read_chunk(SerdReader* reader); + +/** + Finish an incremental read from a file handle. +*/ +SERD_API +SerdStatus +serd_reader_end_stream(SerdReader* reader); + +/** + Read `file`. +*/ +SERD_API +SerdStatus +serd_reader_read_file_handle(SerdReader* reader, + FILE* file, + const uint8_t* name); + +/** + Read a user-specified byte source. +*/ +SERD_API +SerdStatus +serd_reader_read_source(SerdReader* reader, + SerdSource source, + SerdStreamErrorFunc error, + void* stream, + const uint8_t* name, + size_t page_size); + +/** + Read `utf8`. +*/ +SERD_API +SerdStatus +serd_reader_read_string(SerdReader* reader, const uint8_t* utf8); + +/** + Free `reader`. +*/ +SERD_API +void +serd_reader_free(SerdReader* reader); + +/** + @} + @name Writer + @{ +*/ + +/** + Create a new RDF writer. +*/ +SERD_API +SerdWriter* +serd_writer_new(SerdSyntax syntax, + SerdStyle style, + SerdEnv* env, + const SerdURI* base_uri, + SerdSink ssink, + void* stream); + +/** + Free `writer`. +*/ +SERD_API +void +serd_writer_free(SerdWriter* writer); + +/** + Return the env used by `writer`. +*/ +SERD_API +SerdEnv* +serd_writer_get_env(SerdWriter* writer); + +/** + A convenience sink function for writing to a FILE*. + + This function can be used as a SerdSink when writing to a FILE*. The + `stream` parameter must be a FILE* opened for writing. +*/ +SERD_API +size_t +serd_file_sink(const void* buf, size_t len, void* stream); + +/** + A convenience sink function for writing to a string. + + This function can be used as a SerdSink to write to a SerdChunk which is + resized as necessary with realloc(). The `stream` parameter must point to + an initialized SerdChunk. When the write is finished, the string should be + retrieved with serd_chunk_sink_finish(). +*/ +SERD_API +size_t +serd_chunk_sink(const void* buf, size_t len, void* stream); + +/** + Finish a serialisation to a chunk with serd_chunk_sink(). + + The returned string is the result of the serialisation, which is NULL + terminated (by this function) and owned by the caller. +*/ +SERD_API +uint8_t* +serd_chunk_sink_finish(SerdChunk* stream); + +/** + Set a function to be called when errors occur during writing. + + The `error_sink` will be called with `handle` as its first argument. If + no error function is set, errors are printed to stderr. +*/ +SERD_API +void +serd_writer_set_error_sink(SerdWriter* writer, + SerdErrorSink error_sink, + void* error_handle); + +/** + Set a prefix to be removed from matching blank node identifiers. +*/ +SERD_API +void +serd_writer_chop_blank_prefix(SerdWriter* writer, + const uint8_t* prefix); + +/** + Set the current output base URI (and emit directive if applicable). + + Note this function can be safely casted to SerdBaseSink. +*/ +SERD_API +SerdStatus +serd_writer_set_base_uri(SerdWriter* writer, + const SerdNode* uri); + +/** + Set the current root URI. + + The root URI should be a prefix of the base URI. The path of the root URI + is the highest path any relative up-reference can refer to. For example, + with root <file:///foo/root> and base <file:///foo/root/base>, + <file:///foo/root> will be written as <../>, but <file:///foo> will be + written non-relatively as <file:///foo>. If the root is not explicitly set, + it defaults to the base URI, so no up-references will be created at all. +*/ +SERD_API +SerdStatus +serd_writer_set_root_uri(SerdWriter* writer, + const SerdNode* uri); + +/** + Set a namespace prefix (and emit directive if applicable). + + Note this function can be safely casted to SerdPrefixSink. +*/ +SERD_API +SerdStatus +serd_writer_set_prefix(SerdWriter* writer, + const SerdNode* name, + const SerdNode* uri); + +/** + Write a statement. + + Note this function can be safely casted to SerdStatementSink. +*/ +SERD_API +SerdStatus +serd_writer_write_statement(SerdWriter* writer, + SerdStatementFlags flags, + const SerdNode* graph, + const SerdNode* subject, + const SerdNode* predicate, + const SerdNode* object, + const SerdNode* datatype, + const SerdNode* lang); + +/** + Mark the end of an anonymous node's description. + + Note this function can be safely casted to SerdEndSink. +*/ +SERD_API +SerdStatus +serd_writer_end_anon(SerdWriter* writer, + const SerdNode* node); + +/** + Finish a write. +*/ +SERD_API +SerdStatus +serd_writer_finish(SerdWriter* writer); + +/** + @} + @} +*/ + +#ifdef __cplusplus +# if defined(__GNUC__) +# pragma GCC diagnostic pop +# endif +} /* extern "C" */ +#endif + +#endif /* SERD_SERD_H */ |