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-rw-r--r--src/compare.c147
-rw-r--r--src/compare.h37
-rw-r--r--src/cursor.c224
-rw-r--r--src/cursor.h71
-rw-r--r--src/describe.c314
-rw-r--r--src/inserter.c146
-rw-r--r--src/model.c820
-rw-r--r--src/model.h29
-rw-r--r--src/reader.c2
-rw-r--r--src/string.c4
10 files changed, 1793 insertions, 1 deletions
diff --git a/src/compare.c b/src/compare.c
new file mode 100644
index 00000000..2ce49cc2
--- /dev/null
+++ b/src/compare.c
@@ -0,0 +1,147 @@
+// Copyright 2011-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "compare.h"
+
+#include "statement.h" // IWYU pragma: keep
+
+#include "serd/node.h"
+#include "serd/statement.h"
+#include "zix/attributes.h"
+
+#include <assert.h>
+
+/// Compare a mandatory node with a node pattern
+ZIX_PURE_FUNC static inline int
+serd_node_wildcard_compare(const SerdNode* ZIX_NONNULL a,
+ const SerdNode* ZIX_NULLABLE b)
+{
+ assert(a);
+ return b ? serd_node_compare(a, b) : 0;
+}
+
+/// Compare an optional graph node with a node pattern
+static inline int
+serd_node_graph_compare(const SerdNode* ZIX_NULLABLE a,
+ const SerdNode* ZIX_NULLABLE b)
+{
+ if (a == b) {
+ return 0;
+ }
+
+ if (!a) {
+ return -1;
+ }
+
+ if (!b) {
+ return 1;
+ }
+
+ return serd_node_compare(a, b);
+}
+
+/// Compare statements lexicographically, ignoring graph
+int
+serd_triple_compare(const void* const x,
+ const void* const y,
+ const void* const user_data)
+{
+ const int* const ordering = (const int*)user_data;
+ const SerdStatement* const s = (const SerdStatement*)x;
+ const SerdStatement* const t = (const SerdStatement*)y;
+
+ for (unsigned i = 0U; i < 3U; ++i) {
+ const int o = ordering[i];
+ assert(o < 3);
+
+ const int c = serd_node_compare(s->nodes[o], t->nodes[o]);
+ if (c) {
+ return c;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ Compare statments with statement patterns lexicographically, ignoring graph.
+
+ Null nodes in the second argument are treated as wildcards, always less than
+ any node.
+*/
+int
+serd_triple_compare_pattern(const void* const x,
+ const void* const y,
+ const void* const user_data)
+{
+ const int* const ordering = (const int*)user_data;
+ const SerdStatement* const s = (const SerdStatement*)x;
+ const SerdStatement* const t = (const SerdStatement*)y;
+
+ for (unsigned i = 0U; i < 3U; ++i) {
+ const int o = ordering[i];
+ assert(o < 3);
+
+ const int c = serd_node_wildcard_compare(s->nodes[o], t->nodes[o]);
+ if (c) {
+ return c;
+ }
+ }
+
+ return 0;
+}
+
+/// Compare statements lexicographically
+int
+serd_quad_compare(const void* const x,
+ const void* const y,
+ const void* const user_data)
+{
+ const int* const ordering = (const int*)user_data;
+ const SerdStatement* const s = (const SerdStatement*)x;
+ const SerdStatement* const t = (const SerdStatement*)y;
+
+ for (unsigned i = 0U; i < 4U; ++i) {
+ const int o = ordering[i];
+ const int c =
+ (o == SERD_GRAPH)
+ ? serd_node_graph_compare(s->nodes[SERD_GRAPH], t->nodes[SERD_GRAPH])
+ : serd_node_compare(s->nodes[o], t->nodes[o]);
+
+ if (c) {
+ return c;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ Compare statments with statement patterns lexicographically.
+
+ Null nodes in the second argument are treated as wildcards, always less than
+ any node.
+*/
+int
+serd_quad_compare_pattern(const void* const x,
+ const void* const y,
+ const void* const user_data)
+{
+ const int* const ordering = (const int*)user_data;
+ const SerdStatement* const s = (const SerdStatement*)x;
+ const SerdStatement* const t = (const SerdStatement*)y;
+
+ for (unsigned i = 0U; i < 4U; ++i) {
+ const int o = ordering[i];
+ const int c =
+ (o == SERD_GRAPH)
+ ? serd_node_graph_compare(s->nodes[SERD_GRAPH], t->nodes[SERD_GRAPH])
+ : serd_node_wildcard_compare(s->nodes[o], t->nodes[o]);
+
+ if (c) {
+ return c;
+ }
+ }
+
+ return 0;
+}
diff --git a/src/compare.h b/src/compare.h
new file mode 100644
index 00000000..f4dbc046
--- /dev/null
+++ b/src/compare.h
@@ -0,0 +1,37 @@
+// Copyright 2011-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef SERD_SRC_COMPARE_H
+#define SERD_SRC_COMPARE_H
+
+#include "zix/attributes.h"
+
+/// Compare statements lexicographically, ignoring graph
+ZIX_PURE_FUNC int
+serd_triple_compare(const void* x, const void* y, const void* user_data);
+
+/**
+ Compare statments with statement patterns lexicographically, ignoring graph.
+
+ Null nodes in the second argument are treated as wildcards, always less than
+ any node.
+*/
+ZIX_PURE_FUNC int
+serd_triple_compare_pattern(const void* x,
+ const void* y,
+ const void* user_data);
+
+/// Compare statements lexicographically
+ZIX_PURE_FUNC int
+serd_quad_compare(const void* x, const void* y, const void* user_data);
+
+/**
+ Compare statments with statement patterns lexicographically.
+
+ Null nodes in the second argument are treated as wildcards, always less than
+ any node.
+*/
+ZIX_PURE_FUNC int
+serd_quad_compare_pattern(const void* x, const void* y, const void* user_data);
+
+#endif // ZIX_SRC_COMPARE_H
diff --git a/src/cursor.c b/src/cursor.c
new file mode 100644
index 00000000..d6a86d19
--- /dev/null
+++ b/src/cursor.c
@@ -0,0 +1,224 @@
+// Copyright 2011-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "cursor.h"
+
+#include "memory.h"
+#include "model.h"
+#include "node.h"
+#include "statement.h"
+
+#include "serd/log.h"
+#include "serd/memory.h"
+#include "serd/statement.h"
+#include "zix/attributes.h"
+#include "zix/btree.h"
+#include "zix/status.h"
+
+#include <assert.h>
+#include <stdbool.h>
+#include <string.h>
+
+static inline bool
+statement_matches_quad(const SerdStatement* const statement,
+ const SerdNode* const quad[4])
+{
+ return serd_statement_matches(statement, quad[0], quad[1], quad[2], quad[3]);
+}
+
+ZIX_PURE_FUNC bool
+serd_iter_in_range(const ZixBTreeIter iter,
+ const SerdNode* const pattern[4],
+ const ScanStrategy strategy)
+{
+ const SerdStatement* const statement =
+ (const SerdStatement*)zix_btree_get(iter);
+
+ for (unsigned i = 0U; i < strategy.n_prefix; ++i) {
+ const unsigned field = orderings[strategy.order][i];
+ if (!serd_node_pattern_match(statement->nodes[field], pattern[field])) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool
+serd_cursor_in_range(const SerdCursor* const cursor)
+{
+ return (cursor->strategy.mode == FILTER_EVERYTHING ||
+ serd_iter_in_range(cursor->iter, cursor->pattern, cursor->strategy));
+}
+
+/// Seek forward as necessary until the cursor points to a matching statement
+static SerdStatus
+serd_cursor_seek_match(SerdCursor* const cursor)
+{
+ assert(cursor->strategy.mode == FILTER_EVERYTHING ||
+ cursor->strategy.mode == FILTER_RANGE);
+
+ for (; !zix_btree_iter_is_end(cursor->iter);
+ zix_btree_iter_increment(&cursor->iter)) {
+ if (!serd_cursor_in_range(cursor)) {
+ // Went past the end of the matching range, reset to end
+ cursor->iter = zix_btree_end_iter;
+ return SERD_FAILURE;
+ }
+
+ const SerdStatement* s = (const SerdStatement*)zix_btree_get(cursor->iter);
+ if (statement_matches_quad(s, cursor->pattern)) {
+ break; // Found matching statement
+ }
+ }
+
+ return SERD_SUCCESS;
+}
+
+static bool
+check_version(const SerdCursor* const cursor)
+{
+ if (cursor->version != cursor->model->version) {
+ serd_logf(cursor->model->world,
+ SERD_LOG_LEVEL_ERROR,
+ "attempt to use invalidated cursor");
+ return false;
+ }
+
+ return true;
+}
+
+SerdCursor
+serd_cursor_make(const SerdModel* const model,
+ const ZixBTreeIter iter,
+ const SerdNode* const pattern[4],
+ const ScanStrategy strategy)
+{
+ SerdCursor cursor = {model,
+ {pattern[0], pattern[1], pattern[2], pattern[3]},
+ model->version,
+ iter,
+ strategy};
+
+ if (strategy.mode == FILTER_RANGE || strategy.mode == FILTER_EVERYTHING) {
+ serd_cursor_seek_match(&cursor);
+ }
+
+#ifndef NDEBUG
+ if (!zix_btree_iter_is_end(cursor.iter)) {
+ // Check that the cursor is at a matching statement
+ const SerdStatement* first =
+ (const SerdStatement*)zix_btree_get(cursor.iter);
+ assert(statement_matches_quad(first, pattern));
+
+ // Check that any nodes in the pattern are interned
+ for (unsigned i = 0U; i < 3; ++i) {
+ assert(!cursor.pattern[i] || cursor.pattern[i] == first->nodes[i]);
+ }
+ }
+#endif
+
+ return cursor;
+}
+
+SerdCursor*
+serd_cursor_copy(SerdAllocator* const allocator, const SerdCursor* const cursor)
+{
+ if (!cursor) {
+ return NULL;
+ }
+
+ SerdCursor* const copy =
+ (SerdCursor* const)serd_amalloc(allocator, sizeof(SerdCursor));
+
+ if (copy) {
+ memcpy(copy, cursor, sizeof(SerdCursor));
+ }
+
+ return copy;
+}
+
+const SerdStatement*
+serd_cursor_get(const SerdCursor* const cursor)
+{
+ return (
+ (cursor && !zix_btree_iter_is_end(cursor->iter) && check_version(cursor))
+ ? (const SerdStatement*)zix_btree_get(cursor->iter)
+ : NULL);
+}
+
+SerdStatus
+serd_cursor_scan_next(SerdCursor* const cursor)
+{
+ if (zix_btree_iter_is_end(cursor->iter) || !check_version(cursor)) {
+ return SERD_BAD_CURSOR;
+ }
+
+ switch (cursor->strategy.mode) {
+ case SCAN_EVERYTHING:
+ break;
+
+ case SCAN_RANGE:
+ if (!serd_cursor_in_range(cursor)) {
+ // Went past the end of the matching range
+ cursor->iter = zix_btree_end_iter;
+ return SERD_FAILURE;
+ }
+ break;
+
+ case FILTER_EVERYTHING:
+ case FILTER_RANGE:
+ // Seek forward to next match
+ return serd_cursor_seek_match(cursor);
+ }
+
+ return SERD_SUCCESS;
+}
+
+SerdStatus
+serd_cursor_advance(SerdCursor* const cursor)
+{
+ if (!cursor) {
+ return SERD_FAILURE;
+ }
+
+ if (zix_btree_iter_is_end(cursor->iter) || !check_version(cursor)) {
+ return SERD_BAD_CURSOR;
+ }
+
+ const ZixStatus zst = zix_btree_iter_increment(&cursor->iter);
+ if (zst) {
+ assert(zst == ZIX_STATUS_REACHED_END);
+ return SERD_FAILURE;
+ }
+
+ return serd_cursor_scan_next(cursor);
+}
+
+bool
+serd_cursor_is_end(const SerdCursor* const cursor)
+{
+ return !cursor || zix_btree_iter_is_end(cursor->iter);
+}
+
+bool
+serd_cursor_equals(const SerdCursor* const lhs, const SerdCursor* const rhs)
+{
+ if (serd_cursor_is_end(lhs) || serd_cursor_is_end(rhs)) {
+ return serd_cursor_is_end(lhs) && serd_cursor_is_end(rhs);
+ }
+
+ /* We don't bother checking if the patterns match each other here, or if both
+ cursors have the same ordering, since both of these must be true if the
+ BTree iterators are equal. */
+
+ return (zix_btree_iter_equals(lhs->iter, rhs->iter) &&
+ lhs->strategy.mode == rhs->strategy.mode &&
+ lhs->strategy.n_prefix == rhs->strategy.n_prefix);
+}
+
+void
+serd_cursor_free(SerdAllocator* const allocator, SerdCursor* const cursor)
+{
+ serd_afree(allocator, cursor);
+}
diff --git a/src/cursor.h b/src/cursor.h
new file mode 100644
index 00000000..d7de7471
--- /dev/null
+++ b/src/cursor.h
@@ -0,0 +1,71 @@
+// Copyright 2011-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef SERD_SRC_CURSOR_H
+#define SERD_SRC_CURSOR_H
+
+#include "serd/cursor.h"
+#include "serd/model.h"
+#include "serd/node.h"
+#include "serd/status.h"
+#include "zix/btree.h"
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#define N_STATEMENT_ORDERS 12u
+
+/// An iteration mode that determines what to skip and when to end
+typedef enum {
+ SCAN_EVERYTHING, ///< Iterate over entire store
+ SCAN_RANGE, ///< Iterate over range with equal prefix
+ FILTER_EVERYTHING, ///< Iterate to end of store, filtering
+ FILTER_RANGE, ///< Iterate over range with equal prefix, filtering
+} ScanMode;
+
+/// A strategy for searching and iterating over a statement index
+typedef struct {
+ ScanMode mode; ///< Iteration mode
+ unsigned n_prefix; ///< Number of prefix nodes that match the index
+ SerdStatementOrder order; ///< Order of index to scan
+} ScanStrategy;
+
+struct SerdCursorImpl {
+ const SerdModel* model; ///< Model being iterated over
+ const SerdNode* pattern[4]; ///< Search pattern (nodes in model or null)
+ size_t version; ///< Model version when iterator was created
+ ZixBTreeIter iter; ///< Current position in index
+ ScanStrategy strategy; ///< Index scanning strategy
+};
+
+/// Lookup table of ordered indices for each SerdStatementOrder
+static const unsigned orderings[N_STATEMENT_ORDERS][4] = {
+ {0U, 1U, 2U, 3U}, // SPOG
+ {0U, 2U, 1U, 3U}, // SOPG
+ {2U, 1U, 0U, 3U}, // OPSG
+ {2U, 0U, 1U, 3U}, // OPSG
+ {1U, 0U, 2U, 3U}, // PSOG
+ {1U, 2U, 0U, 3U}, // PSOG
+ {3U, 0U, 1U, 2U}, // GSPO
+ {3U, 0U, 2U, 1U}, // GSPO
+ {3U, 2U, 1U, 0U}, // GOPS
+ {3U, 2U, 0U, 1U}, // GOPS
+ {3U, 1U, 0U, 2U}, // GPSO
+ {3U, 1U, 2U, 0U} // GPSO
+};
+
+SerdCursor
+serd_cursor_make(const SerdModel* model,
+ ZixBTreeIter iter,
+ const SerdNode* const pattern[4],
+ ScanStrategy strategy);
+
+SerdStatus
+serd_cursor_scan_next(SerdCursor* cursor);
+
+bool
+serd_iter_in_range(ZixBTreeIter iter,
+ const SerdNode* const pattern[4],
+ ScanStrategy strategy);
+
+#endif // SERD_SRC_CURSOR_H
diff --git a/src/describe.c b/src/describe.c
new file mode 100644
index 00000000..a7012cf9
--- /dev/null
+++ b/src/describe.c
@@ -0,0 +1,314 @@
+// Copyright 2011-2023 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "cursor.h"
+#include "model.h"
+#include "world.h"
+
+// Define the types used in the hash interface for more type safety
+#define ZIX_HASH_KEY_TYPE const SerdNode
+#define ZIX_HASH_RECORD_TYPE const SerdNode
+
+#include "serd/cursor.h"
+#include "serd/describe.h"
+#include "serd/memory.h"
+#include "serd/model.h"
+#include "serd/node.h"
+#include "serd/sink.h"
+#include "serd/statement.h"
+#include "serd/status.h"
+#include "serd/world.h"
+#include "zix/allocator.h"
+#include "zix/attributes.h"
+#include "zix/digest.h"
+#include "zix/hash.h"
+#include "zix/status.h"
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+typedef enum { NAMED, ANON_S, ANON_O, LIST_S, LIST_O } NodeStyle;
+
+typedef struct {
+ SerdAllocator* allocator; // Allocator for auxiliary structures
+ const SerdModel* model; // Model to read from
+ const SerdSink* sink; // Sink to write description to
+ ZixHash* list_subjects; // Nodes written in the current list or null
+ SerdDescribeFlags flags; // Flags to control description
+} DescribeContext;
+
+static SerdStatus
+write_range_statement(const DescribeContext* ctx,
+ unsigned depth,
+ SerdStatementFlags statement_flags,
+ const SerdStatement* statement,
+ const SerdNode* last_subject,
+ bool write_types);
+
+static NodeStyle
+get_node_style(const SerdModel* const model, const SerdNode* const node)
+{
+ if (serd_node_type(node) != SERD_BLANK) {
+ return NAMED; // Non-blank node can't be anonymous
+ }
+
+ const size_t n_as_object = serd_model_count(model, NULL, NULL, node, NULL);
+ if (n_as_object > 1) {
+ return NAMED; // Blank node referred to several times
+ }
+
+ if (serd_model_count(model, node, model->world->rdf_first, NULL, NULL) == 1 &&
+ serd_model_count(model, node, model->world->rdf_rest, NULL, NULL) == 1 &&
+ !serd_model_ask(model, NULL, model->world->rdf_rest, node, NULL)) {
+ return n_as_object == 0 ? LIST_S : LIST_O;
+ }
+
+ return n_as_object == 0 ? ANON_S : ANON_O;
+}
+
+static const SerdNode*
+identity(const SerdNode* const record)
+{
+ return record;
+}
+
+static ZixHashCode
+ptr_hash(const SerdNode* const ptr)
+{
+ return zix_digest(0U, &ptr, sizeof(SerdNode*));
+}
+
+static bool
+ptr_equals(const SerdNode* const a, const SerdNode* const b)
+{
+ return *(const void* const*)a == *(const void* const*)b;
+}
+
+static SerdStatus
+write_pretty_range(const DescribeContext* const ctx,
+ const unsigned depth,
+ SerdCursor* const range,
+ const SerdNode* last_subject,
+ bool write_types)
+{
+ SerdStatus st = SERD_SUCCESS;
+ const SerdStatement* statement = serd_cursor_get(range);
+
+ while (statement) {
+ // Write this statement (and possibly more to describe anonymous nodes)
+ if ((st = write_range_statement(
+ ctx, depth, 0U, statement, last_subject, write_types))) {
+ break;
+ }
+
+ // Update the last subject and advance the cursor
+ last_subject = serd_statement_subject(statement);
+ st = serd_cursor_advance(range);
+ statement = serd_cursor_get(range);
+ }
+
+ return st > SERD_FAILURE ? st : SERD_SUCCESS;
+}
+
+static SerdStatus
+write_list(const DescribeContext* const ctx,
+ const unsigned depth,
+ SerdStatementFlags flags,
+ const SerdNode* node,
+ const SerdNode* const graph)
+{
+ const SerdModel* const model = ctx->model;
+ const SerdWorld* const world = model->world;
+ const SerdSink* const sink = ctx->sink;
+ const SerdNode* const rdf_first = world->rdf_first;
+ const SerdNode* const rdf_rest = world->rdf_rest;
+ const SerdNode* const rdf_nil = world->rdf_nil;
+ SerdStatus st = SERD_SUCCESS;
+
+ const SerdStatement* fs =
+ serd_model_get_statement(model, node, rdf_first, NULL, graph);
+
+ assert(fs); // Shouldn't get here if it doesn't at least have an rdf:first
+
+ while (!st && !serd_node_equals(node, rdf_nil)) {
+ // Write rdf:first statement for this node
+ if ((st = write_range_statement(ctx, depth, flags, fs, NULL, false))) {
+ return st;
+ }
+
+ // Get rdf:rest statement
+ const SerdStatement* const rs =
+ serd_model_get_statement(model, node, rdf_rest, NULL, graph);
+
+ if (!rs) {
+ // Terminate malformed list with missing rdf:rest
+ return serd_sink_write(sink, 0, node, rdf_rest, rdf_nil, graph);
+ }
+
+ // Terminate if the next node has no rdf:first
+ const SerdNode* const next = serd_statement_object(rs);
+ if (!(fs = serd_model_get_statement(model, next, rdf_first, NULL, graph))) {
+ return serd_sink_write(sink, 0, node, rdf_rest, rdf_nil, graph);
+ }
+
+ // Write rdf:next statement and move to the next node
+ st = serd_sink_write_statement(sink, 0, rs);
+ node = next;
+ flags = 0U;
+ }
+
+ return st;
+}
+
+static bool
+skip_range_statement(const SerdModel* const model,
+ const SerdStatement* const statement)
+{
+ const SerdNode* const subject = serd_statement_subject(statement);
+ const NodeStyle subject_style = get_node_style(model, subject);
+ const SerdNode* const predicate = serd_statement_predicate(statement);
+
+ if (subject_style == ANON_O || subject_style == LIST_O) {
+ return true; // Skip subject that will be inlined elsewhere
+ }
+
+ if (subject_style == LIST_S &&
+ (serd_node_equals(predicate, model->world->rdf_first) ||
+ serd_node_equals(predicate, model->world->rdf_rest))) {
+ return true; // Skip list statement that write_list will handle
+ }
+
+ return false;
+}
+
+static SerdStatus
+write_subject_types(const DescribeContext* const ctx,
+ const unsigned depth,
+ const SerdNode* const subject,
+ const SerdNode* const graph)
+{
+ SerdCursor* const t = serd_model_find(ctx->allocator,
+ ctx->model,
+ subject,
+ ctx->model->world->rdf_type,
+ NULL,
+ graph);
+
+ const SerdStatus st =
+ t ? write_pretty_range(ctx, depth + 1, t, subject, true) : SERD_SUCCESS;
+
+ serd_cursor_free(ctx->allocator, t);
+ return st;
+}
+
+static bool
+types_first_for_subject(const DescribeContext* const ctx, const NodeStyle style)
+{
+ return style != LIST_S && !(ctx->flags & SERD_NO_TYPE_FIRST);
+}
+
+static SerdStatus
+write_range_statement(const DescribeContext* const ctx,
+ const unsigned depth,
+ SerdStatementFlags statement_flags,
+ const SerdStatement* ZIX_NONNULL statement,
+ const SerdNode* ZIX_NULLABLE last_subject,
+ const bool write_types)
+{
+ const SerdModel* const model = ctx->model;
+ const SerdSink* const sink = ctx->sink;
+ const SerdNode* const subject = serd_statement_subject(statement);
+ const NodeStyle subject_style = get_node_style(model, subject);
+ const SerdNode* const predicate = serd_statement_predicate(statement);
+ const SerdNode* const object = serd_statement_object(statement);
+ const NodeStyle object_style = get_node_style(model, object);
+ const SerdNode* const graph = serd_statement_graph(statement);
+ SerdStatus st = SERD_SUCCESS;
+
+ if (depth == 0U) {
+ if (skip_range_statement(model, statement)) {
+ return SERD_SUCCESS; // Skip subject that will be inlined elsewhere
+ }
+
+ if (subject_style == LIST_S) {
+ // First write inline list subject, which this statement will follow
+ if (zix_hash_insert(ctx->list_subjects, subject) != ZIX_STATUS_EXISTS) {
+ st = write_list(ctx, 2, statement_flags | SERD_LIST_S, subject, graph);
+ }
+ }
+ }
+
+ if (st) {
+ return st;
+ }
+
+ // If this is a new subject, write types first if necessary
+ const bool types_first = types_first_for_subject(ctx, subject_style);
+ if (subject != last_subject && types_first) {
+ st = write_subject_types(ctx, depth, subject, graph);
+ }
+
+ // Skip type statement if it would be written another time (just above)
+ if (subject_style != LIST_S && !write_types &&
+ serd_node_equals(predicate, model->world->rdf_type)) {
+ return st;
+ }
+
+ // Set up the flags for this statement
+ statement_flags |=
+ (((subject_style == ANON_S) * (SerdStatementFlags)SERD_EMPTY_S) |
+ ((object_style == ANON_O) * (SerdStatementFlags)SERD_ANON_O) |
+ ((object_style == LIST_O) * (SerdStatementFlags)SERD_LIST_O));
+
+ // Finally write this statement
+ if ((st = serd_sink_write_statement(sink, statement_flags, statement))) {
+ return st;
+ }
+
+ if (object_style == ANON_O) {
+ // Follow an anonymous object with its description like "[ ... ]"
+ SerdCursor* const iter =
+ serd_model_find(ctx->allocator, model, object, NULL, NULL, NULL);
+
+ if (!(st = write_pretty_range(ctx, depth + 1, iter, last_subject, false))) {
+ st = serd_sink_write_end(sink, object);
+ }
+
+ serd_cursor_free(ctx->allocator, iter);
+
+ } else if (object_style == LIST_O) {
+ // Follow a list object with its description like "( ... )"
+ st = write_list(ctx, depth + 1, 0U, object, graph);
+ }
+
+ return st;
+}
+
+SerdStatus
+serd_describe_range(SerdAllocator* const allocator,
+ const SerdCursor* const range,
+ const SerdSink* sink,
+ const SerdDescribeFlags flags)
+{
+ if (serd_cursor_is_end(range)) {
+ return SERD_SUCCESS;
+ }
+
+ assert(sink);
+
+ SerdCursor copy = *range;
+
+ ZixHash* const list_subjects =
+ zix_hash_new((ZixAllocator*)allocator, identity, ptr_hash, ptr_equals);
+
+ SerdStatus st = SERD_BAD_ALLOC;
+ if (list_subjects) {
+ DescribeContext ctx = {allocator, range->model, sink, list_subjects, flags};
+
+ st = write_pretty_range(&ctx, 0, &copy, NULL, (flags & SERD_NO_TYPE_FIRST));
+ }
+
+ zix_hash_free(list_subjects);
+ return st;
+}
diff --git a/src/inserter.c b/src/inserter.c
new file mode 100644
index 00000000..f3b8631b
--- /dev/null
+++ b/src/inserter.c
@@ -0,0 +1,146 @@
+// Copyright 2011-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "memory.h"
+#include "model.h"
+#include "statement.h"
+
+#include "serd/caret.h"
+#include "serd/event.h"
+#include "serd/inserter.h"
+#include "serd/log.h"
+#include "serd/model.h"
+#include "serd/node.h"
+#include "serd/nodes.h"
+#include "serd/sink.h"
+#include "serd/statement.h"
+#include "serd/status.h"
+#include "serd/uri.h"
+#include "serd/world.h"
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+typedef struct {
+ SerdModel* model;
+ SerdNode* default_graph;
+} SerdInserterData;
+
+static bool
+can_insert(SerdWorld* const world, const SerdNode* const node)
+{
+ if (node) {
+ switch (serd_node_type(node)) {
+ case SERD_LITERAL:
+ return can_insert(world, serd_node_datatype(node));
+
+ case SERD_URI:
+ if (!serd_uri_string_has_scheme(serd_node_string(node))) {
+ serd_logf(world,
+ SERD_LOG_LEVEL_ERROR,
+ "attempt to insert relative URI <%s> into model",
+ serd_node_string(node));
+ return false;
+ }
+ break;
+
+ case SERD_BLANK:
+ case SERD_VARIABLE:
+ break;
+ }
+ }
+
+ return true;
+}
+
+static SerdStatus
+serd_inserter_on_statement(SerdInserterData* const data,
+ const SerdStatementFlags flags,
+ const SerdStatement* const statement)
+{
+ (void)flags;
+
+ SerdModel* const model = data->model;
+ SerdWorld* const world = model->world;
+
+ // Check that every node is expanded so it is context-free
+ for (unsigned i = 0; i < 4; ++i) {
+ if (!can_insert(world, serd_statement_node(statement, (SerdField)i))) {
+ return SERD_BAD_DATA;
+ }
+ }
+
+ const SerdNode* const s =
+ serd_nodes_intern(model->nodes, serd_statement_subject(statement));
+
+ const SerdNode* const p =
+ serd_nodes_intern(model->nodes, serd_statement_predicate(statement));
+
+ const SerdNode* const o =
+ serd_nodes_intern(model->nodes, serd_statement_object(statement));
+
+ const SerdNode* const g = serd_nodes_intern(
+ model->nodes,
+ serd_statement_graph(statement) ? serd_statement_graph(statement)
+ : data->default_graph);
+
+ const SerdCaret* const caret =
+ (data->model->flags & SERD_STORE_CARETS) ? statement->caret : NULL;
+
+ const SerdStatus st =
+ serd_model_add_with_caret(data->model, s, p, o, g, caret);
+
+ return st > SERD_FAILURE ? st : SERD_SUCCESS;
+}
+
+static SerdStatus
+serd_inserter_on_event(void* const handle, const SerdEvent* const event)
+{
+ SerdInserterData* const data = (SerdInserterData*)handle;
+
+ if (event->type == SERD_STATEMENT) {
+ return serd_inserter_on_statement(
+ data, event->statement.flags, event->statement.statement);
+ }
+
+ return SERD_SUCCESS;
+}
+
+static SerdInserterData*
+serd_inserter_data_new(SerdModel* const model,
+ const SerdNode* const default_graph)
+{
+ SerdInserterData* const data =
+ (SerdInserterData*)serd_wcalloc(model->world, 1, sizeof(SerdInserterData));
+
+ if (data) {
+ data->model = model;
+ data->default_graph = serd_node_copy(model->allocator, default_graph);
+ }
+
+ return data;
+}
+
+static void
+serd_inserter_data_free(void* const ptr)
+{
+ SerdInserterData* const data = (SerdInserterData*)ptr;
+ serd_node_free(data->model->allocator, data->default_graph);
+ serd_wfree(data->model->world, data);
+}
+
+SerdSink*
+serd_inserter_new(SerdModel* const model, const SerdNode* const default_graph)
+{
+ assert(model);
+
+ SerdEventFunc func = serd_inserter_on_event;
+ SerdInserterData* const data = serd_inserter_data_new(model, default_graph);
+
+ return data ? serd_sink_new(serd_world_allocator(model->world),
+ data,
+ func,
+ (SerdFreeFunc)serd_inserter_data_free)
+ : NULL;
+}
diff --git a/src/model.c b/src/model.c
new file mode 100644
index 00000000..89b37d83
--- /dev/null
+++ b/src/model.c
@@ -0,0 +1,820 @@
+// Copyright 2011-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "model.h"
+
+#include "caret.h"
+#include "compare.h"
+#include "cursor.h"
+#include "memory.h"
+#include "statement.h"
+
+#include "serd/caret.h"
+#include "serd/log.h"
+#include "serd/node.h"
+#include "serd/statement.h"
+#include "serd/status.h"
+#include "zix/allocator.h"
+#include "zix/btree.h"
+#include "zix/status.h"
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+static const SerdNode* const everything_pattern[4] = {NULL, NULL, NULL, NULL};
+
+/// A 3-bit signature for a triple pattern used as a table index
+typedef enum {
+ SERD_SIGNATURE_XXX, // 000 (???)
+ SERD_SIGNATURE_XXO, // 001 (??O)
+ SERD_SIGNATURE_XPX, // 010 (?P?)
+ SERD_SIGNATURE_XPO, // 011 (?PO)
+ SERD_SIGNATURE_SXX, // 100 (S??)
+ SERD_SIGNATURE_SXO, // 101 (S?O)
+ SERD_SIGNATURE_SPX, // 110 (SP?)
+ SERD_SIGNATURE_SPO, // 111 (SPO)
+} SerdPatternSignature;
+
+static SerdPatternSignature
+serd_model_pattern_signature(const bool with_s,
+ const bool with_p,
+ const bool with_o)
+{
+ return (SerdPatternSignature)(((with_s ? 1U : 0U) << 2U) +
+ ((with_p ? 1U : 0U) << 1U) +
+ ((with_o ? 1U : 0U)));
+}
+
+static ZixBTreeCompareFunc
+serd_model_index_comparator(const SerdModel* const model,
+ const SerdStatementOrder order)
+{
+ return (order < SERD_ORDER_GSPO && !(model->flags & SERD_STORE_GRAPHS))
+ ? serd_triple_compare
+ : serd_quad_compare;
+}
+
+static ZixBTreeCompareFunc
+serd_model_pattern_comparator(const SerdModel* const model,
+ const SerdStatementOrder order)
+{
+ return (order < SERD_ORDER_GSPO && !(model->flags & SERD_STORE_GRAPHS))
+ ? serd_triple_compare_pattern
+ : serd_quad_compare_pattern;
+}
+
+SerdStatus
+serd_model_add_index(SerdModel* const model, const SerdStatementOrder order)
+{
+ assert(model);
+
+ if (model->indices[order]) {
+ return SERD_FAILURE;
+ }
+
+ const unsigned* const ordering = orderings[order];
+ const ZixBTreeCompareFunc comparator =
+ serd_model_index_comparator(model, order);
+
+ model->indices[order] =
+ zix_btree_new((ZixAllocator*)model->allocator, comparator, ordering);
+
+ if (!model->indices[order]) {
+ return SERD_BAD_ALLOC;
+ }
+
+ // Insert statements from the default index
+ ZixStatus zst = ZIX_STATUS_SUCCESS;
+ if (order != model->default_order) {
+ ZixBTree* const default_index = model->indices[model->default_order];
+ for (ZixBTreeIter i = zix_btree_begin(default_index);
+ !zst && !zix_btree_iter_is_end(i);
+ zix_btree_iter_increment(&i)) {
+ zst = zix_btree_insert(model->indices[order], zix_btree_get(i));
+ }
+ }
+
+ return zst ? serd_model_drop_index(model, order) : SERD_SUCCESS;
+}
+
+SerdStatus
+serd_model_drop_index(SerdModel* const model, const SerdStatementOrder order)
+{
+ assert(model);
+
+ if (!model->indices[order]) {
+ return SERD_FAILURE;
+ }
+
+ if (order == model->default_order) {
+ return SERD_BAD_CALL;
+ }
+
+ zix_btree_free(model->indices[order], NULL, NULL);
+ model->indices[order] = NULL;
+ return SERD_SUCCESS;
+}
+
+static SerdModel*
+serd_model_new_with_allocator(SerdAllocator* const allocator,
+ SerdWorld* const world,
+ const SerdStatementOrder default_order,
+ const SerdModelFlags flags)
+{
+ assert(world);
+
+ SerdNodes* const nodes = serd_nodes_new(allocator);
+ if (!nodes) {
+ return NULL;
+ }
+
+ SerdModel* model =
+ (SerdModel*)serd_acalloc(allocator, 1, sizeof(struct SerdModelImpl));
+
+ if (!model) {
+ serd_nodes_free(nodes);
+ return NULL;
+ }
+
+ model->allocator = allocator;
+ model->world = world;
+ model->nodes = nodes;
+ model->default_order = default_order;
+ model->flags = flags;
+
+ if (serd_model_add_index(model, default_order)) {
+ serd_nodes_free(nodes);
+ serd_wfree(world, model);
+ return NULL;
+ }
+
+ const ScanStrategy end_strategy = {SCAN_EVERYTHING, 0U, default_order};
+
+ model->end = serd_cursor_make(model,
+ zix_btree_end(model->indices[default_order]),
+ everything_pattern,
+ end_strategy);
+
+ return model;
+}
+
+SerdModel*
+serd_model_new(SerdWorld* const world,
+ const SerdStatementOrder default_order,
+ const SerdModelFlags flags)
+{
+ return serd_model_new_with_allocator(
+ serd_world_allocator(world), world, default_order, flags);
+}
+
+static void
+log_bad_index(const SerdModel* const model,
+ const char* const description,
+ const SerdStatementOrder index_order,
+ const bool s,
+ const bool p,
+ const bool o,
+ const bool g)
+{
+ static const char* const order_strings[] = {
+ "S P O G",
+ "S O P G",
+ "O P S G",
+ "O S P G",
+ "P S O G",
+ "P O S G",
+ "G S P O",
+ "G S O P",
+ "G O P S",
+ "G O S P",
+ "G P S O",
+ "G P O S",
+ };
+
+ serd_logf(model->world,
+ SERD_LOG_LEVEL_WARNING,
+ "%s index (%s) for (%s %s %s%s) query",
+ description,
+ order_strings[index_order],
+ s ? "S" : "?",
+ p ? "P" : "?",
+ o ? "O" : "?",
+ (model->flags & SERD_STORE_GRAPHS) ? g ? " G" : " ?" : "");
+}
+
+static SerdCursor
+make_begin_cursor(const SerdModel* const model, const SerdStatementOrder order)
+{
+ if (!model->indices[order]) {
+ log_bad_index(model, "missing", order, false, false, false, false);
+ return model->end;
+ }
+
+ const ScanStrategy strategy = {SCAN_EVERYTHING, 0U, order};
+
+ return serd_cursor_make(model,
+ zix_btree_begin(model->indices[order]),
+ everything_pattern,
+ strategy);
+}
+
+SerdModel*
+serd_model_copy(SerdAllocator* const allocator, const SerdModel* const model)
+{
+ assert(model);
+
+ SerdModel* copy = serd_model_new_with_allocator(
+ allocator, model->world, model->default_order, model->flags);
+
+ SerdCursor cursor = make_begin_cursor(model, model->default_order);
+ serd_model_insert_statements(copy, &cursor);
+
+ assert(serd_model_size(model) == serd_model_size(copy));
+ assert(serd_nodes_size(model->nodes) == serd_nodes_size(copy->nodes));
+ return copy;
+}
+
+bool
+serd_model_equals(const SerdModel* const a, const SerdModel* const b)
+{
+ if (!a && !b) {
+ return true;
+ }
+
+ if (!a || !b || serd_model_size(a) != serd_model_size(b)) {
+ return false;
+ }
+
+ SerdCursor ia = make_begin_cursor(a, a->default_order);
+ SerdCursor ib = make_begin_cursor(b, b->default_order);
+
+ while (!serd_cursor_is_end(&ia) && !serd_cursor_is_end(&ib)) {
+ if (!serd_statement_equals(serd_cursor_get(&ia), serd_cursor_get(&ib)) ||
+ serd_cursor_advance(&ia) > SERD_FAILURE ||
+ serd_cursor_advance(&ib) > SERD_FAILURE) {
+ return false;
+ }
+ }
+
+ return serd_cursor_is_end(&ia) && serd_cursor_is_end(&ib);
+}
+
+static void
+serd_model_drop_statement(SerdModel* const model,
+ SerdStatement* const statement)
+{
+ assert(statement);
+
+ for (unsigned i = 0U; i < 4; ++i) {
+ if (statement->nodes[i]) {
+ serd_nodes_deref(model->nodes, statement->nodes[i]);
+ }
+ }
+
+ if (statement->caret && serd_caret_document(statement->caret)) {
+ serd_nodes_deref(model->nodes, serd_caret_document(statement->caret));
+ }
+
+ serd_statement_free(model->allocator, statement);
+}
+
+typedef struct {
+ SerdAllocator* allocator;
+} DestroyContext;
+
+static void
+destroy_tree_statement(void* ptr, const void* user_data)
+{
+ const DestroyContext* const ctx = (const DestroyContext*)user_data;
+
+ serd_statement_free(ctx->allocator, (SerdStatement*)ptr);
+}
+
+void
+serd_model_free(SerdModel* const model)
+{
+ if (!model) {
+ return;
+ }
+
+ // Free all statements (which are owned by the default index)
+ ZixBTree* const default_index = model->indices[model->default_order];
+ const DestroyContext ctx = {model->allocator};
+ zix_btree_clear(default_index, destroy_tree_statement, &ctx);
+
+ // Free indices themselves
+ for (unsigned i = 0U; i < N_STATEMENT_ORDERS; ++i) {
+ zix_btree_free(model->indices[i], NULL, NULL);
+ }
+
+ serd_nodes_free(model->nodes);
+ serd_wfree(model->world, model);
+}
+
+SerdWorld*
+serd_model_world(SerdModel* const model)
+{
+ assert(model);
+ return model->world;
+}
+
+const SerdNodes*
+serd_model_nodes(const SerdModel* const model)
+{
+ assert(model);
+ return model->nodes;
+}
+
+SerdStatementOrder
+serd_model_default_order(const SerdModel* const model)
+{
+ assert(model);
+ return model->default_order;
+}
+
+SerdModelFlags
+serd_model_flags(const SerdModel* const model)
+{
+ assert(model);
+ return model->flags;
+}
+
+size_t
+serd_model_size(const SerdModel* const model)
+{
+ assert(model);
+ return zix_btree_size(model->indices[model->default_order]);
+}
+
+bool
+serd_model_empty(const SerdModel* const model)
+{
+ assert(model);
+ return serd_model_size(model) == 0;
+}
+
+SerdCursor*
+serd_model_begin_ordered(SerdAllocator* const allocator,
+ const SerdModel* const model,
+ const SerdStatementOrder order)
+{
+ assert(model);
+
+ const SerdCursor cursor = make_begin_cursor(model, order);
+
+ return serd_cursor_copy(allocator, &cursor);
+}
+
+SerdCursor*
+serd_model_begin(SerdAllocator* const allocator, const SerdModel* const model)
+{
+ assert(model);
+ return serd_model_begin_ordered(allocator, model, model->default_order);
+}
+
+const SerdCursor*
+serd_model_end(const SerdModel* const model)
+{
+ assert(model);
+ return &model->end;
+}
+
+static SerdStatementOrder
+simple_order(const SerdStatementOrder order)
+{
+ return order < SERD_ORDER_GSPO ? order : (SerdStatementOrder)(order - 6U);
+}
+
+/// Return the best index scanning strategy for a pattern with given nodes
+static ScanStrategy
+serd_model_strategy(const SerdModel* const model,
+ const bool with_s,
+ const bool with_p,
+ const bool with_o,
+ const bool with_g)
+{
+#define N_STRATEGY_TIERS 4U
+
+ const SerdStatementOrder default_order = simple_order(model->default_order);
+ const ScanStrategy none = {SCAN_EVERYTHING, 0U, default_order};
+
+ const ScanStrategy strategies[N_STRATEGY_TIERS][8] = {
+ // Preferred perfect strategies: SPO, SOP, OPS, PSO
+ {
+ none,
+ {SCAN_RANGE, 1U, SERD_ORDER_OPS}, // ??O
+ {SCAN_RANGE, 1U, SERD_ORDER_PSO}, // ?P?
+ {SCAN_RANGE, 2U, SERD_ORDER_OPS}, // ?PO
+ {SCAN_RANGE, 1U, SERD_ORDER_SPO}, // S??
+ {SCAN_RANGE, 2U, SERD_ORDER_SOP}, // S?O
+ {SCAN_RANGE, 2U, SERD_ORDER_SPO}, // SP?
+ {SCAN_RANGE, 3U, default_order} // SPO
+ },
+
+ // Alternate perfect strategies: adds OSP and POS
+ {
+ none, // ???
+ {SCAN_RANGE, 1U, SERD_ORDER_OSP}, // ??O
+ {SCAN_RANGE, 1U, SERD_ORDER_POS}, // ?P?
+ {SCAN_RANGE, 2U, SERD_ORDER_POS}, // ?PO
+ {SCAN_RANGE, 1U, SERD_ORDER_SOP}, // S??
+ {SCAN_RANGE, 2U, SERD_ORDER_OSP}, // S?O
+ {SCAN_RANGE, 2U, SERD_ORDER_PSO}, // SP?
+ none // SPO
+ },
+
+ // Preferred partial prefix strategies
+ {
+ none, // ???
+ none, // ??O
+ none, // ?P?
+ {FILTER_RANGE, 1U, SERD_ORDER_PSO}, // ?PO
+ none, // S??
+ {FILTER_RANGE, 1U, SERD_ORDER_SPO}, // S?O
+ {FILTER_RANGE, 1U, SERD_ORDER_SOP}, // SP?
+ none // SPO
+ },
+
+ // Alternate partial prefix strategies
+ {
+ none, // ???
+ none, // ??O
+ none, // ?P?
+ {FILTER_RANGE, 1U, SERD_ORDER_OSP}, // ?PO
+ none, // S??
+ {FILTER_RANGE, 1U, SERD_ORDER_OPS}, // S?O
+ {FILTER_RANGE, 1U, SERD_ORDER_POS}, // SP?
+ none // SPO
+ },
+ };
+
+ // Construct a 3-bit signature for this triple pattern
+ const SerdPatternSignature sig =
+ serd_model_pattern_signature(with_s, with_p, with_o);
+ if (!sig && !with_g) {
+ return none;
+ }
+
+ // Try to find a strategy we can support, from most to least preferred
+ for (unsigned t = 0U; t < N_STRATEGY_TIERS; ++t) {
+ ScanStrategy strategy = strategies[t][sig];
+ const SerdStatementOrder triple_order = strategy.order;
+
+ assert(strategy.order < SERD_ORDER_GSPO);
+
+ if (strategy.n_prefix > 0) {
+ if (with_g) {
+ const SerdStatementOrder quad_order =
+ (SerdStatementOrder)(triple_order + 6U);
+
+ if (model->indices[quad_order]) {
+ strategy.order = quad_order;
+ ++strategy.n_prefix;
+ return strategy;
+ }
+ }
+
+ if (model->indices[triple_order]) {
+ return strategy;
+ }
+ }
+ }
+
+ // Indices don't help with the triple, try to at least stay in the graph
+ if (with_g) {
+ for (unsigned i = SERD_ORDER_GSPO; i <= SERD_ORDER_GPOS; ++i) {
+ if (model->indices[i]) {
+ const ScanMode mode = sig == 0x000 ? SCAN_RANGE : FILTER_RANGE;
+ const ScanStrategy strategy = {mode, 1U, (SerdStatementOrder)i};
+
+ return strategy;
+ }
+ }
+ }
+
+ // All is lost, regress to linear search
+ const ScanStrategy linear = {FILTER_EVERYTHING, 0U, model->default_order};
+ return linear;
+}
+
+static SerdCursor
+serd_model_search(const SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g)
+{
+ // Build a pattern of interned nodes
+ const SerdNode* pattern[4] = {serd_nodes_existing(model->nodes, s),
+ serd_nodes_existing(model->nodes, p),
+ serd_nodes_existing(model->nodes, o),
+ serd_nodes_existing(model->nodes, g)};
+
+ // If some node isn't in the model at all, no need to search for statements
+ const int n_given = !!s + !!p + !!o + !!g;
+ if (n_given != (!!pattern[0] + !!pattern[1] + !!pattern[2] + !!pattern[3])) {
+ return model->end;
+ }
+
+ // Determine the best available search strategy
+ const ScanStrategy strategy = serd_model_strategy(model, s, p, o, g);
+ const SerdStatementOrder order = strategy.order;
+ ZixBTree* const index = model->indices[order];
+
+ // Issue any performance warnings, and return early for degenerate cases
+ switch (strategy.mode) {
+ case SCAN_EVERYTHING:
+ return make_begin_cursor(model, order);
+ case SCAN_RANGE:
+ break;
+ case FILTER_EVERYTHING:
+ log_bad_index(model, "using effectively linear", order, s, p, o, g);
+ return serd_cursor_make(model, zix_btree_begin(index), pattern, strategy);
+ case FILTER_RANGE:
+ log_bad_index(model, "filtering partial", order, s, p, o, g);
+ break;
+ }
+
+ // Find the first statement matching the pattern in the index
+ ZixBTreeIter iter = zix_btree_end_iter;
+ zix_btree_lower_bound(index,
+ serd_model_pattern_comparator(model, order),
+ orderings[order],
+ pattern,
+ &iter);
+
+ return (!zix_btree_iter_is_end(iter) &&
+ serd_iter_in_range(iter, pattern, strategy))
+ ? serd_cursor_make(model, iter, pattern, strategy)
+ : model->end;
+}
+
+SerdCursor*
+serd_model_find(SerdAllocator* const allocator,
+ const SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g)
+{
+ assert(model);
+
+ const SerdCursor cursor = serd_model_search(model, s, p, o, g);
+
+ return zix_btree_iter_is_end(cursor.iter)
+ ? NULL
+ : serd_cursor_copy(allocator, &cursor);
+}
+
+const SerdNode*
+serd_model_get(const SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g)
+{
+ assert(model);
+
+ const SerdStatement* const statement =
+ serd_model_get_statement(model, s, p, o, g);
+
+ return !statement ? NULL
+ : !s ? serd_statement_subject(statement)
+ : !p ? serd_statement_predicate(statement)
+ : !o ? serd_statement_object(statement)
+ : !g ? serd_statement_graph(statement)
+ : NULL;
+}
+
+const SerdStatement*
+serd_model_get_statement(const SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g)
+{
+ assert(model);
+
+ if ((bool)s + (bool)p + (bool)o != 2 &&
+ (bool)s + (bool)p + (bool)o + (bool)g != 3) {
+ return NULL;
+ }
+
+ const SerdCursor i = serd_model_search(model, s, p, o, g);
+
+ return serd_cursor_get(&i);
+}
+
+size_t
+serd_model_count(const SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g)
+{
+ assert(model);
+
+ SerdCursor i = serd_model_search(model, s, p, o, g);
+ size_t count = 0;
+
+ for (; !serd_cursor_is_end(&i); serd_cursor_advance(&i)) {
+ ++count;
+ }
+
+ return count;
+}
+
+bool
+serd_model_ask(const SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g)
+{
+ assert(model);
+
+ const SerdCursor c = serd_model_search(model, s, p, o, g);
+
+ return !serd_cursor_is_end(&c);
+}
+
+static SerdCaret*
+serd_model_intern_caret(SerdModel* const model, const SerdCaret* const caret)
+{
+ if (!caret) {
+ return NULL;
+ }
+
+ SerdCaret* const copy =
+ (SerdCaret*)serd_acalloc(model->allocator, 1, sizeof(SerdCaret));
+
+ if (copy) {
+ copy->document = serd_nodes_intern(model->nodes, caret->document);
+ copy->line = caret->line;
+ copy->col = caret->col;
+ }
+
+ return copy;
+}
+
+SerdStatus
+serd_model_add_with_caret(SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g,
+ const SerdCaret* const caret)
+{
+ assert(model);
+
+ SerdStatement* const statement =
+ serd_statement_new(model->allocator, s, p, o, g, NULL);
+
+ if (!statement) {
+ return SERD_BAD_ALLOC;
+ }
+
+ statement->caret = serd_model_intern_caret(model, caret);
+
+ bool added = false;
+ for (unsigned i = 0U; i < N_STATEMENT_ORDERS; ++i) {
+ if (model->indices[i]) {
+ if (!zix_btree_insert(model->indices[i], statement)) {
+ added = true;
+ } else if ((SerdStatementOrder)i == model->default_order) {
+ break; // Statement already indexed
+ }
+ }
+ }
+
+ ++model->version;
+ if (added) {
+ return SERD_SUCCESS;
+ }
+
+ serd_model_drop_statement(model, statement);
+ return SERD_FAILURE;
+}
+
+SerdStatus
+serd_model_add(SerdModel* const model,
+ const SerdNode* const s,
+ const SerdNode* const p,
+ const SerdNode* const o,
+ const SerdNode* const g)
+{
+ return serd_model_add_with_caret(model,
+ serd_nodes_intern(model->nodes, s),
+ serd_nodes_intern(model->nodes, p),
+ serd_nodes_intern(model->nodes, o),
+ serd_nodes_intern(model->nodes, g),
+ NULL);
+}
+
+SerdStatus
+serd_model_insert(SerdModel* const model, const SerdStatement* const statement)
+{
+ SerdNodes* const nodes = model->nodes;
+
+ return serd_model_add_with_caret(
+ model,
+ serd_nodes_intern(nodes, serd_statement_subject(statement)),
+ serd_nodes_intern(nodes, serd_statement_predicate(statement)),
+ serd_nodes_intern(nodes, serd_statement_object(statement)),
+ serd_nodes_intern(nodes, serd_statement_graph(statement)),
+ serd_statement_caret(statement));
+}
+
+SerdStatus
+serd_model_insert_statements(SerdModel* const model, SerdCursor* const range)
+{
+ const SerdStatement* statement = serd_cursor_get(range);
+ SerdStatus st = SERD_SUCCESS;
+
+ while (!st && statement) {
+ if (!(st = serd_model_insert(model, statement))) {
+ st = serd_cursor_advance(range);
+ }
+
+ statement = serd_cursor_get(range);
+ }
+
+ return st;
+}
+
+SerdStatus
+serd_model_erase(SerdModel* const model, SerdCursor* const cursor)
+{
+ assert(model);
+ assert(cursor);
+
+ const SerdStatement* statement = serd_cursor_get(cursor);
+ SerdStatement* removed = NULL;
+ ZixStatus zst = ZIX_STATUS_SUCCESS;
+
+ if (!statement) {
+ return SERD_FAILURE;
+ }
+
+ // Erase from the index associated with this cursor
+ zst = zix_btree_remove(model->indices[cursor->strategy.order],
+ statement,
+ (void**)&removed,
+ &cursor->iter);
+
+ // No error should be possible with a valid cursor
+ assert(!zst);
+ assert(removed);
+ assert(removed == statement);
+
+ for (unsigned i = SERD_ORDER_SPO; i <= SERD_ORDER_GPOS; ++i) {
+ ZixBTree* index = model->indices[i];
+
+ if (index && i != (unsigned)cursor->strategy.order) {
+ SerdStatement* ignored = NULL;
+ ZixBTreeIter next = zix_btree_end_iter;
+ zst = zix_btree_remove(index, statement, (void**)&ignored, &next);
+
+ assert(zst == ZIX_STATUS_SUCCESS || zst == ZIX_STATUS_NOT_FOUND);
+ assert(!ignored || ignored == removed);
+ }
+ }
+ serd_cursor_scan_next(cursor);
+
+ serd_model_drop_statement(model, removed);
+ cursor->version = ++model->version;
+
+ (void)zst;
+ return SERD_SUCCESS;
+}
+
+SerdStatus
+serd_model_erase_statements(SerdModel* const model, SerdCursor* const range)
+{
+ assert(model);
+ assert(range);
+
+ SerdStatus st = SERD_SUCCESS;
+
+ while (!st && !serd_cursor_is_end(range)) {
+ st = serd_model_erase(model, range);
+ }
+
+ return st;
+}
+
+SerdStatus
+serd_model_clear(SerdModel* const model)
+{
+ assert(model);
+
+ SerdStatus st = SERD_SUCCESS;
+ SerdCursor i = make_begin_cursor(model, model->default_order);
+
+ while (!st && !serd_cursor_is_end(&i)) {
+ st = serd_model_erase(model, &i);
+ }
+
+ return st;
+}
diff --git a/src/model.h b/src/model.h
new file mode 100644
index 00000000..a67ba087
--- /dev/null
+++ b/src/model.h
@@ -0,0 +1,29 @@
+// Copyright 2011-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef SERD_SRC_MODEL_H
+#define SERD_SRC_MODEL_H
+
+#include "cursor.h"
+
+#include "serd/cursor.h"
+#include "serd/memory.h"
+#include "serd/model.h"
+#include "serd/nodes.h"
+#include "serd/world.h"
+#include "zix/btree.h"
+
+#include <stddef.h>
+
+struct SerdModelImpl {
+ SerdAllocator* allocator; ///< Allocator for everything in this model
+ SerdWorld* world; ///< World this model is a part of
+ SerdNodes* nodes; ///< Interned nodes in this model
+ ZixBTree* indices[12]; ///< Trees of SerdStatement pointers
+ SerdCursor end; ///< End cursor (always the same)
+ size_t version; ///< Version incremented on every change
+ SerdStatementOrder default_order; ///< Order for main statement-owning index
+ SerdModelFlags flags; ///< Active indices and features
+};
+
+#endif // SERD_SRC_MODEL_H
diff --git a/src/reader.c b/src/reader.c
index b7a64ce4..5ce81962 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -89,7 +89,7 @@ tolerate_status(const SerdReader* const reader, const SerdStatus status)
if (status == SERD_BAD_STREAM || status == SERD_BAD_STACK ||
status == SERD_BAD_WRITE || status == SERD_NO_DATA ||
- status == SERD_BAD_CALL) {
+ status == SERD_BAD_CALL || status == SERD_BAD_CURSOR) {
return false;
}
diff --git a/src/string.c b/src/string.c
index b8227100..ac964705 100644
--- a/src/string.c
+++ b/src/string.c
@@ -64,6 +64,10 @@ serd_strerror(const SerdStatus status)
return "Invalid literal";
case SERD_BAD_PATTERN:
return "Invalid statement pattern";
+ case SERD_BAD_CURSOR:
+ return "Invalid cursor";
+ case SERD_BAD_INDEX:
+ return "No suitable model index available";
}
return "Unknown error";
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-22 22:32:48 +0000