Add serd_node_from_syntax() and serd_node_to_syntax()

1 files changed, 48 insertions, 0 deletions

diff --git a/include/serd/serd.h b/include/serd/serd.h
index 05c1ed8c..4067fa3f 100644
--- a/include/serd/serd.h
+++ b/include/serd/serd.h
@@ -1666,6 +1666,54 @@ serd_env_write_prefixes(const SerdEnv* SERD_NONNULL  env,
                         const SerdSink* SERD_NONNULL sink);
 
 /**
+   Create a node from a string representation in `syntax`.
+
+   The string should be a node as if written as an object in the given syntax,
+   without any extra quoting or punctuation, which is the format returned by
+   serd_node_to_syntax().  These two functions, when used with #SERD_TURTLE,
+   can be used to round-trip any node to a string and back.
+
+   @param str String representation of a node.
+
+   @param syntax Syntax to use.  Should be either SERD_TURTLE or SERD_NTRIPLES
+   (the others are redundant).  Note that namespaced (CURIE) nodes and relative
+   URIs can not be expressed in NTriples.
+
+   @param env Environment of `str`.  This must define any abbreviations needed
+   to parse the string.
+
+   @return A newly allocated node that must be freed with serd_node_free().
+*/
+SERD_API
+SerdNode* SERD_ALLOCATED
+serd_node_from_syntax(const char* SERD_NONNULL str,
+                      SerdSyntax               syntax,
+                      SerdEnv* SERD_NULLABLE   env);
+
+/**
+   Return a string representation of `node` in `syntax`.
+
+   The returned string represents that node as if written as an object in the
+   given syntax, without any extra quoting or punctuation.
+
+   @param node Node to write as a string.
+
+   @param syntax Syntax to use.  Should be either SERD_TURTLE or SERD_NTRIPLES
+   (the others are redundant).  Note that namespaced (CURIE) nodes and relative
+   URIs can not be expressed in NTriples.
+
+   @param env Environment for the output string.  This can be used to
+   abbreviate things nicely by setting namespace prefixes.
+
+   @return A newly allocated string that must be freed with serd_free().
+*/
+SERD_API
+char* SERD_ALLOCATED
+serd_node_to_syntax(const SerdNode* SERD_NONNULL node,
+                    SerdSyntax                   syntax,
+                    const SerdEnv* SERD_NULLABLE env);
+
+/**
    @}
    @defgroup serd_byte_source Byte Source
    @{