395 lines
9.8 KiB
C
395 lines
9.8 KiB
C
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#include "yaml_private.h"
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/*
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* API functions.
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*/
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YAML_DECLARE(int)
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yaml_emitter_open(yaml_emitter_t *emitter);
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YAML_DECLARE(int)
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yaml_emitter_close(yaml_emitter_t *emitter);
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YAML_DECLARE(int)
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yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document);
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/*
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* Clean up functions.
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*/
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static void
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yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter);
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/*
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* Anchor functions.
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*/
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static void
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yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index);
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static yaml_char_t *
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yaml_emitter_generate_anchor(yaml_emitter_t *emitter, int anchor_id);
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/*
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* Serialize functions.
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*/
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static int
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yaml_emitter_dump_node(yaml_emitter_t *emitter, int index);
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static int
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yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor);
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static int
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yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node,
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yaml_char_t *anchor);
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static int
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yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node,
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yaml_char_t *anchor);
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static int
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yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node,
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yaml_char_t *anchor);
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/*
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* Issue a STREAM-START event.
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*/
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YAML_DECLARE(int)
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yaml_emitter_open(yaml_emitter_t *emitter)
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{
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yaml_event_t event;
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yaml_mark_t mark = { 0, 0, 0 };
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assert(emitter); /* Non-NULL emitter object is required. */
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assert(!emitter->opened); /* Emitter should not be opened yet. */
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STREAM_START_EVENT_INIT(event, YAML_ANY_ENCODING, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) {
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return 0;
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}
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emitter->opened = 1;
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return 1;
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}
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/*
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* Issue a STREAM-END event.
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*/
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YAML_DECLARE(int)
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yaml_emitter_close(yaml_emitter_t *emitter)
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{
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yaml_event_t event;
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yaml_mark_t mark = { 0, 0, 0 };
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assert(emitter); /* Non-NULL emitter object is required. */
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assert(emitter->opened); /* Emitter should be opened. */
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if (emitter->closed) return 1;
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STREAM_END_EVENT_INIT(event, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) {
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return 0;
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}
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emitter->closed = 1;
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return 1;
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}
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/*
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* Dump a YAML document.
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*/
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YAML_DECLARE(int)
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yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document)
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{
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yaml_event_t event;
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yaml_mark_t mark = { 0, 0, 0 };
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assert(emitter); /* Non-NULL emitter object is required. */
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assert(document); /* Non-NULL emitter object is expected. */
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emitter->document = document;
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if (!emitter->opened) {
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if (!yaml_emitter_open(emitter)) goto error;
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}
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if (STACK_EMPTY(emitter, document->nodes)) {
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if (!yaml_emitter_close(emitter)) goto error;
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yaml_emitter_delete_document_and_anchors(emitter);
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return 1;
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}
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assert(emitter->opened); /* Emitter should be opened. */
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emitter->anchors = (yaml_anchors_t*)yaml_malloc(sizeof(*(emitter->anchors))
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* (document->nodes.top - document->nodes.start));
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if (!emitter->anchors) goto error;
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memset(emitter->anchors, 0, sizeof(*(emitter->anchors))
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* (document->nodes.top - document->nodes.start));
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DOCUMENT_START_EVENT_INIT(event, document->version_directive,
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document->tag_directives.start, document->tag_directives.end,
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document->start_implicit, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) goto error;
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yaml_emitter_anchor_node(emitter, 1);
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if (!yaml_emitter_dump_node(emitter, 1)) goto error;
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DOCUMENT_END_EVENT_INIT(event, document->end_implicit, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) goto error;
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yaml_emitter_delete_document_and_anchors(emitter);
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return 1;
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error:
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yaml_emitter_delete_document_and_anchors(emitter);
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return 0;
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}
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/*
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* Clean up the emitter object after a document is dumped.
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*/
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static void
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yaml_emitter_delete_document_and_anchors(yaml_emitter_t *emitter)
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{
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int index;
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if (!emitter->anchors) {
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yaml_document_delete(emitter->document);
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emitter->document = NULL;
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return;
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}
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for (index = 0; emitter->document->nodes.start + index
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< emitter->document->nodes.top; index ++) {
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yaml_node_t node = emitter->document->nodes.start[index];
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if (!emitter->anchors[index].serialized) {
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yaml_free(node.tag);
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if (node.type == YAML_SCALAR_NODE) {
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yaml_free(node.data.scalar.value);
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}
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}
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if (node.type == YAML_SEQUENCE_NODE) {
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STACK_DEL(emitter, node.data.sequence.items);
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}
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if (node.type == YAML_MAPPING_NODE) {
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STACK_DEL(emitter, node.data.mapping.pairs);
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}
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}
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STACK_DEL(emitter, emitter->document->nodes);
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yaml_free(emitter->anchors);
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emitter->anchors = NULL;
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emitter->last_anchor_id = 0;
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emitter->document = NULL;
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}
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/*
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* Check the references of a node and assign the anchor id if needed.
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*/
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static void
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yaml_emitter_anchor_node(yaml_emitter_t *emitter, int index)
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{
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yaml_node_t *node = emitter->document->nodes.start + index - 1;
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yaml_node_item_t *item;
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yaml_node_pair_t *pair;
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emitter->anchors[index-1].references ++;
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if (emitter->anchors[index-1].references == 1) {
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switch (node->type) {
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case YAML_SEQUENCE_NODE:
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for (item = node->data.sequence.items.start;
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item < node->data.sequence.items.top; item ++) {
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yaml_emitter_anchor_node(emitter, *item);
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}
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break;
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case YAML_MAPPING_NODE:
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for (pair = node->data.mapping.pairs.start;
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pair < node->data.mapping.pairs.top; pair ++) {
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yaml_emitter_anchor_node(emitter, pair->key);
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yaml_emitter_anchor_node(emitter, pair->value);
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}
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break;
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default:
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break;
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}
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}
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else if (emitter->anchors[index-1].references == 2) {
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emitter->anchors[index-1].anchor = (++ emitter->last_anchor_id);
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}
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}
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/*
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* Generate a textual representation for an anchor.
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*/
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#define ANCHOR_TEMPLATE "id%03d"
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#define ANCHOR_TEMPLATE_LENGTH 16
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static yaml_char_t *
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yaml_emitter_generate_anchor(SHIM(yaml_emitter_t *emitter), int anchor_id)
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{
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yaml_char_t *anchor = YAML_MALLOC(ANCHOR_TEMPLATE_LENGTH);
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if (!anchor) return NULL;
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sprintf((char *)anchor, ANCHOR_TEMPLATE, anchor_id);
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return anchor;
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}
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/*
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* Serialize a node.
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*/
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static int
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yaml_emitter_dump_node(yaml_emitter_t *emitter, int index)
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{
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yaml_node_t *node = emitter->document->nodes.start + index - 1;
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int anchor_id = emitter->anchors[index-1].anchor;
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yaml_char_t *anchor = NULL;
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if (anchor_id) {
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anchor = yaml_emitter_generate_anchor(emitter, anchor_id);
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if (!anchor) return 0;
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}
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if (emitter->anchors[index-1].serialized) {
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return yaml_emitter_dump_alias(emitter, anchor);
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}
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emitter->anchors[index-1].serialized = 1;
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switch (node->type) {
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case YAML_SCALAR_NODE:
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return yaml_emitter_dump_scalar(emitter, node, anchor);
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case YAML_SEQUENCE_NODE:
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return yaml_emitter_dump_sequence(emitter, node, anchor);
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case YAML_MAPPING_NODE:
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return yaml_emitter_dump_mapping(emitter, node, anchor);
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default:
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assert(0); /* Could not happen. */
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break;
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}
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return 0; /* Could not happen. */
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}
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/*
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* Serialize an alias.
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*/
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static int
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yaml_emitter_dump_alias(yaml_emitter_t *emitter, yaml_char_t *anchor)
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{
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yaml_event_t event;
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yaml_mark_t mark = { 0, 0, 0 };
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ALIAS_EVENT_INIT(event, anchor, mark, mark);
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return yaml_emitter_emit(emitter, &event);
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}
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/*
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* Serialize a scalar.
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*/
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static int
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yaml_emitter_dump_scalar(yaml_emitter_t *emitter, yaml_node_t *node,
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yaml_char_t *anchor)
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{
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yaml_event_t event;
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yaml_mark_t mark = { 0, 0, 0 };
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int plain_implicit = (strcmp((char *)node->tag,
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YAML_DEFAULT_SCALAR_TAG) == 0);
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int quoted_implicit = (strcmp((char *)node->tag,
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YAML_DEFAULT_SCALAR_TAG) == 0);
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SCALAR_EVENT_INIT(event, anchor, node->tag, node->data.scalar.value,
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node->data.scalar.length, plain_implicit, quoted_implicit,
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node->data.scalar.style, mark, mark);
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return yaml_emitter_emit(emitter, &event);
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}
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/*
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* Serialize a sequence.
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*/
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static int
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yaml_emitter_dump_sequence(yaml_emitter_t *emitter, yaml_node_t *node,
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yaml_char_t *anchor)
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{
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yaml_event_t event;
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yaml_mark_t mark = { 0, 0, 0 };
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int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_SEQUENCE_TAG) == 0);
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yaml_node_item_t *item;
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SEQUENCE_START_EVENT_INIT(event, anchor, node->tag, implicit,
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node->data.sequence.style, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) return 0;
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for (item = node->data.sequence.items.start;
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item < node->data.sequence.items.top; item ++) {
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if (!yaml_emitter_dump_node(emitter, *item)) return 0;
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}
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SEQUENCE_END_EVENT_INIT(event, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) return 0;
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return 1;
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}
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/*
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* Serialize a mapping.
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*/
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static int
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yaml_emitter_dump_mapping(yaml_emitter_t *emitter, yaml_node_t *node,
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yaml_char_t *anchor)
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{
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yaml_event_t event;
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yaml_mark_t mark = { 0, 0, 0 };
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int implicit = (strcmp((char *)node->tag, YAML_DEFAULT_MAPPING_TAG) == 0);
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yaml_node_pair_t *pair;
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MAPPING_START_EVENT_INIT(event, anchor, node->tag, implicit,
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node->data.mapping.style, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) return 0;
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for (pair = node->data.mapping.pairs.start;
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pair < node->data.mapping.pairs.top; pair ++) {
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if (!yaml_emitter_dump_node(emitter, pair->key)) return 0;
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if (!yaml_emitter_dump_node(emitter, pair->value)) return 0;
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}
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MAPPING_END_EVENT_INIT(event, mark, mark);
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if (!yaml_emitter_emit(emitter, &event)) return 0;
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return 1;
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}
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