681 lines
18 KiB
C
681 lines
18 KiB
C
#include <assert.h> // assert
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#include <errno.h> // errno
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#include <stddef.h> // NULL, size_t
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#include <stdio.h> // fclose
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#include <stdlib.h> // calloc, free
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#include <string.h> // memcpy
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#include "gemtext-parser.h"
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int lineBufferInit(lineBuffer *lb) {
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char *buf = calloc(1, LBUF_SIZE);
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if (buf == NULL) return 2;
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lb->len = 0;
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lb->capacity = LBUF_SIZE;
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lb->buf = buf;
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lb->cursor = buf;
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return 0;
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}
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int gemtextParserInit(gemtextParser *parser, FILE *stream) {
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int ret = 0;
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parser->stream = stream;
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parser->mode = normalMode;
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parser->state = lineStart;
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parser->linkUrl = NULL;
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ret = lineBufferInit(&parser->buffer);
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return ret;
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}
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gemtextParser* gemtextParserNew(FILE *stream) {
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gemtextParser *parser = calloc(1, sizeof(gemtextParser));
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if (parser == NULL)
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return NULL;
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if (gemtextParserInit(parser, stream) != 0) {
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free(parser);
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return NULL;
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}
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return parser;
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}
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void gemtextParserDeinit(gemtextParser *parser) {
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fclose(parser->stream);
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free(parser->buffer.buf);
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if (parser->linkUrl != NULL) {
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free(parser->linkUrl);
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}
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}
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void gemtextParserDestroy(gemtextParser *parser) {
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gemtextParserDeinit(parser);
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free(parser);
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}
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int gemtextLineQueueInit(gemtextLineQueue *queue) {
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int ret;
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queue->head = NULL;
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queue->tail = NULL;
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ret = pthread_mutex_init(&queue->mutex, NULL);
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if (ret != 0)
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return ret;
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return pthread_cond_init(&queue->cond, NULL);
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}
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void gemtextLineQueuePush(gemtextLineQueue *queue, gemtextLine *line) {
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pthread_mutex_lock(&queue->mutex);
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if (queue->tail == NULL) {
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queue->tail = queue->head = line;
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} else {
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line->next = queue->tail;
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queue->tail->prev = line;
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queue->tail = line;
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}
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queue->count++;
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pthread_mutex_unlock(&queue->mutex);
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}
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gemtextLine* gemtextLineQueuePop(gemtextLineQueue *lq) {
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gemtextLine *line;
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while (lq->count == 0)
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pthread_cond_wait(&lq->cond, &lq->mutex);
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pthread_mutex_lock(&lq->mutex);
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lq->count++;
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line = lq->head;
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if (line->lineType == endOfStream)
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return line;
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if (lq->tail == lq->head) {
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lq->tail = lq->head = NULL;
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} else {
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lq->head = lq->head->prev;
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}
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pthread_mutex_unlock(&lq->mutex);
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line->prev = line->next = NULL;
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return line;
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}
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gemtextLine* gemtextLineQueueTryPop(gemtextLineQueue *lq) {
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gemtextLine *line;
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if (lq->count == 0)
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return NULL;
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pthread_mutex_lock(&lq->mutex);
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lq->count++;
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line = lq->head;
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if (line->lineType == endOfStream)
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return line;
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if (lq->tail == lq->head) {
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lq->tail = lq->head = NULL;
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} else {
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lq->head = lq->head->prev;
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}
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pthread_mutex_unlock(&lq->mutex);
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line->prev = line->next = NULL;
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return line;
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}
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void gemtextLineDeinit(gemtextLine *line) {
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switch (line->lineType) {
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case linkLine:
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if (line->link->display != NULL) {
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free(line->link->display);
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}
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free(line->link->url);
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free(line->link);
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break;
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case preformattedLine:
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if (line->node->altText != NULL) {
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free(line->node->altText);
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}
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free(line->node->body);
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free(line->node);
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break;
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case endOfStream:
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break;
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default:
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free(line->str);
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break;
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}
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free(line);
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}
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int lineBufferExtend(lineBuffer *lb, size_t len) {
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char *buf = calloc(1, lb->capacity + len);
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if (buf == NULL) return 2;
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memcpy(buf, lb->buf, lb->len);
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free(lb->buf);
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lb->buf = buf;
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lb->cursor = buf + lb->len;
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return 0;
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}
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int lineBufferAppendChar(lineBuffer *lb, char c) {
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int ret = 0;
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if (lb->len >= lb->capacity - 1) {
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ret = lineBufferExtend(lb, LBUF_SIZE);
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if (ret != 0) return ret;
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}
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*lb->cursor = c;
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lb->cursor++;
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lb->len++;
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return ret;
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}
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void lineBufferAppendCharUnchecked(lineBuffer *lb, char c) {
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*lb->cursor = c;
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lb->cursor++;
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lb->len++;
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}
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int lineBufferAppendString(lineBuffer *lb, char *c, size_t len) {
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int ret = 0, i = 0;
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size_t rem = 0;
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// Find the remaining length
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rem = lb->capacity - lb->len;
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// if the length won't fit our string, extend the buffer.
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// We do len - rem + LBUF_SIZE for a safety margin
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if (rem < len) {
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ret = lineBufferExtend(lb, len - rem + LBUF_SIZE);
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if (ret != 0) return ret;
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}
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for (i = 0; i < len; i++) {
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// We use 'unchecked' because we did our checks above
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lineBufferAppendCharUnchecked(lb, *c);
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c++;
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}
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return ret;
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}
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void lineBufferRewind(lineBuffer *lb) {
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lb->len--;
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lb->cursor--;
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}
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void lineBufferReset(lineBuffer *lb) {
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lb->len = 0;
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lb->cursor = lb->buf;
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}
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int gemtextParserSendPreformatted(gemtextParser *parser, gemtextLineQueue *lq) {
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preformattedNode *node;
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gemtextLine *line;
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char *buf;
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line = calloc(1, sizeof(gemtextLine));
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if (line == NULL) return errno;
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line->lineType = preformattedLine;
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node = calloc(1, sizeof(preformattedNode));
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if (node == NULL) return errno;
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// back up our cursor four spaces and insert a lf char
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parser->buffer.cursor -= 4;
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parser->buffer.len -= 4;
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lineBufferAppendCharUnchecked(&parser->buffer, '\n');
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buf = strndup(parser->buffer.buf, parser->buffer.len);
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if (buf == NULL) return errno;
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node->altText = parser->altText;
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parser->altText = NULL;
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node->body = buf;
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line->node = node;
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gemtextLineQueuePush(lq, line);
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lineBufferReset(&parser->buffer);
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parser->state = lineStart;
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parser->mode = normalMode;
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return 0;
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}
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int gemtextParserSendLink(gemtextParser *parser, gemtextLineQueue *lq) {
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gemtextLink *link;
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gemtextLine *line;
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char *url = NULL, *display = NULL;
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link = calloc(1, sizeof(gemtextLink));
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if (link == NULL) return errno;
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link->display = link->url = NULL;
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line = calloc(1, sizeof(gemtextLine));
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if (line == NULL) {
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free(link);
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return errno;
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}
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if (parser->linkUrl == NULL) {
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url = strndup(parser->buffer.buf, parser->buffer.len - 1);
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} else {
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url = parser->linkUrl;
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display = strndup(parser->buffer.buf, parser->buffer.len);
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if (display == NULL) {
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free(link);
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free(line);
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return errno;
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}
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}
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link->url = url;
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link->display = display;
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line->lineType = linkLine;
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line->link = link;
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gemtextLineQueuePush(lq, line);
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lineBufferReset(&parser->buffer);
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parser->state = lineStart;
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parser->mode = normalMode;
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parser->linkUrl = NULL;
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return 0;
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}
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int gemtextParserSend(gemtextParser *parser, gemtextLineType lt, gemtextLineQueue *lq) {
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gemtextLine *line;
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char *buf;
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line = calloc(1, sizeof(gemtextLine));
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if (line == NULL) return errno;
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line->lineType = lt;
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buf = strndup(parser->buffer.buf, parser->buffer.len);
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if (buf == NULL) return errno;
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line->str = buf;
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gemtextLineQueuePush(lq, line);
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lineBufferReset(&parser->buffer);
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parser->state = lineStart;
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parser->mode = normalMode;
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return 0;
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}
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void logParseError(int err) {
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//todo
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}
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void switchMode(gemtextParser *parser, gemtextParserMode mode, char c) {
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lineBufferReset(&parser->buffer);
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switch (c) {
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case ' ':
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case '\t':
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parser->state = trimStart;
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break;
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default:
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lineBufferReset(&parser->buffer);
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lineBufferAppendCharUnchecked(&parser->buffer, c);
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parser->state = normalState;
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}
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parser->mode = mode;
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}
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void enterPreformattedMode(gemtextParser *parser) {
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parser->mode = preformattedMode;
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parser->state = trimStart;
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lineBufferReset(&parser->buffer);
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}
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int parseLink(gemtextParser *parser, gemtextLineQueue *lq, char c) {
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int ret = 0;
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char *buf = NULL;
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assert(parser->mode == linkMode);
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switch (parser->state) {
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case lineStart:
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if (c != ' ' && c != '\t') {
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lineBufferReset(&parser->buffer);
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lineBufferAppendCharUnchecked(&parser->buffer, c);
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parser->state = normalState;
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} else if (c == '\n') {
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ret = gemtextParserSend(parser, normalLine, lq);
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}
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break;
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case normalState:
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if (c == ' ' || c == '\t') {
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buf = strndup(parser->buffer.buf, parser->buffer.len - 1);
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if (buf == NULL) return errno;
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parser->linkUrl = buf;
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parser->state = linkDisplayStart;
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lineBufferReset(&parser->buffer);
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} else if (c == '\n') {
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buf = strndup(parser->buffer.buf, parser->buffer.len);
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if (buf == NULL) return errno;
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ret = gemtextParserSendLink(parser, lq);
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}
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break;
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case linkDisplayStart:
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if (c == ' ' || c == '\t') {
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lineBufferRewind(&parser->buffer);
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} else if (c == '\n') {
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ret = gemtextParserSendLink(parser, lq);
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} else {
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parser->state = linkDisplay;
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}
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break;
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case linkDisplay:
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if (c == '\n') {
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ret = gemtextParserSendLink(parser, lq);
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}
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break;
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default:
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ret = 1;
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break;
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}
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return ret;
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}
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int parsePreformatted(gemtextParser *parser, gemtextLineQueue *lq, char c) {
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char *buf = NULL;
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assert(parser->mode == preformattedMode);
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switch (parser->state) {
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case trimStart:
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if (c == '\n') {
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parser->state = lineStart;
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parser->altText = NULL;
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} else if (c == ' ' || c == '\t') {
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lineBufferRewind(&parser->buffer);
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} else {
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parser->state = preformattedAlt;
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}
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break;
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case preformattedAlt:
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if (c == '\n') {
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parser->state = lineStart;
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if (parser->buffer.len > 0) {
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buf = strndup(parser->buffer.buf, parser->buffer.len - 1);
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if (buf == NULL) return errno;
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parser->altText = buf;
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lineBufferReset(&parser->buffer);
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}
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}
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break;
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case normalState:
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if (c == '\n') {
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parser->state = lineStart;
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}
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break;
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case lineStart:
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if (c == '\n') {
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parser->state = lineStart;
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} else if (c == '`') {
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parser->state = firstBacktickChar;
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} else {
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parser->state = normalState;
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}
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break;
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case firstBacktickChar:
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if (c == '`') {
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parser->state = secondBacktickChar;
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} else {
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parser->state = normalState;
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}
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break;
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case secondBacktickChar:
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if (c == '`') {
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parser->state = thirdBacktickChar;
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} else {
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parser->state = normalState;
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}
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break;
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case thirdBacktickChar:
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if (c == '\n') {
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gemtextParserSendPreformatted(parser, lq);
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} else {
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// We discard anything past the third backtick
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parser->buffer.cursor--;
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parser->buffer.len--;
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}
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break;
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default:
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return 1;
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}
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return 0;
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}
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int parseQuote(gemtextParser *parser, gemtextLineQueue *lq, char c) {
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int ret = 0;
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switch (parser->state) {
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case lineStart:
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if (c == '>') {
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parser->state = trimStart;
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lineBufferRewind(&parser->buffer);
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} else {
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lineBufferRewind(&parser->buffer);
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ret = gemtextParserSend(parser, quoteLine, lq);
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if (ret) return ret;
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ret = fseek(parser->stream, -1, SEEK_CUR);
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if (ret) return ret;
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parser->state = lineStart;
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parser->mode = normalMode;
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}
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break;
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case normalState:
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if (c == '\n') {
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parser->state = lineStart;
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}
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break;
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case trimStart:
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if (c == ' ' || c == '\t') {
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// rewind and trim the whitespace
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parser->buffer.len--;
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parser->buffer.cursor--;
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} else if (c == '\n') {
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ret = gemtextParserSend(parser, normalLine, lq);
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} else {
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parser->state = normalState;
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}
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break;
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default:
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// Should be unreachable
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ret = 1;
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break;
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}
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return ret;
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}
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int parseGeneric(gemtextParser *parser, gemtextLineQueue *lq, gemtextLineType lt, char c) {
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int ret = 0;
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switch (parser->state) {
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case lineStart:
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case trimStart:
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if (c == ' ' || c == '\t') {
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// rewind the cursor to trim the line start
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parser->buffer.len--;
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parser->buffer.cursor--;
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} else if (c == '\n') {
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ret = gemtextParserSend(parser, lt, lq);
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} else {
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parser->state = normalState;
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}
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break;
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case normalState:
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if (c == '\n') {
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ret = gemtextParserSend(parser, lt, lq);
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}
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break;
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default:
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// Should be unreachable
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ret = 1;
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break;
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}
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return ret;
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}
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int parseNormal(gemtextParser *parser, gemtextLineQueue *lq, char c) {
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int ret;
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switch (parser->state) {
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case lineStart:
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switch (c) {
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case '=':
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parser->state = firstLinkChar;
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break;
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case '>':
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parser->mode = quoteMode;
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parser->state = trimStart;
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lineBufferRewind(&parser->buffer);
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break;
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case '*':
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parser->mode = listMode;
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parser->state = trimStart;
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lineBufferRewind(&parser->buffer);
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break;
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case '#':
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parser->state = firstHashChar;
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break;
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case '`':
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parser->state = firstBacktickChar;
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break;
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case '\n':
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ret = gemtextParserSend(parser, normalLine, lq);
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if (ret) return ret;
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break;
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default:
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break;
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}
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break;
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case firstLinkChar:
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if (c == '>') {
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parser->mode = linkMode;
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parser->state = lineStart;
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} else if (c == '\n') {
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ret = gemtextParserSend(parser, normalLine, lq);
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if (ret) return ret;
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} else {
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parser->state = normalState;
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}
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break;
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case firstHashChar:
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if (c == '#') {
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parser->state = secondHashChar;
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} else if (c == '\n') {
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ret = gemtextParserSend(parser, normalLine, lq);
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if (ret) return ret;
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} else {
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switchMode(parser, h1Mode, c);
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}
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break;
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case secondHashChar:
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if (c == '#') {
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parser->mode = h3Mode;
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parser->state = trimStart;
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lineBufferReset(&parser->buffer);
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} else if (c == '\n') {
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ret = gemtextParserSend(parser, normalLine, lq);
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if (ret) return ret;
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} else {
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switchMode(parser, h2Mode, c);
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}
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break;
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case thirdHashChar:
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if (c == '\n') {
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ret = gemtextParserSend(parser, normalLine, lq);
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if (ret) return ret;
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} else {
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switchMode(parser, h3Mode, c);
|
|
}
|
|
break;
|
|
case firstBacktickChar:
|
|
if (c == '\n') {
|
|
ret = gemtextParserSend(parser, normalLine, lq);
|
|
if (ret) return ret;
|
|
} else if (c == '`') {
|
|
parser->state = secondBacktickChar;
|
|
} else {
|
|
parser->state = normalState;
|
|
parser->mode = normalMode;
|
|
}
|
|
break;
|
|
case secondBacktickChar:
|
|
if (c == '`') {
|
|
enterPreformattedMode(parser);
|
|
} else if (c == '\n') {
|
|
ret = gemtextParserSend(parser, normalLine, lq);
|
|
if (ret) return ret;
|
|
} else {
|
|
parser->state = normalState;
|
|
parser->mode = normalMode;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int parseGemtext(gemtextParser *parser, gemtextLineQueue *lq) {
|
|
char c;
|
|
int ret;
|
|
gemtextLine *line;
|
|
|
|
for (;;) {
|
|
ret = fread(&c, 1, 1, parser->stream);
|
|
if (ret == 1) {
|
|
ret = lineBufferAppendChar(&parser->buffer, c);
|
|
if (ret) {
|
|
logParseError(ret);
|
|
return ret;
|
|
}
|
|
} else {
|
|
switch (parser->mode) {
|
|
case normalMode:
|
|
ret = gemtextParserSend(parser, normalLine, lq);
|
|
break;
|
|
case preformattedMode:
|
|
ret = gemtextParserSendPreformatted(parser, lq);
|
|
break;
|
|
case quoteMode:
|
|
ret = gemtextParserSend(parser, quoteLine, lq);
|
|
break;
|
|
case linkMode:
|
|
ret = gemtextParserSendLink(parser, lq);
|
|
break;
|
|
case h1Mode:
|
|
ret = gemtextParserSend(parser, h1Line, lq);
|
|
break;
|
|
case h2Mode:
|
|
ret = gemtextParserSend(parser, h2Line, lq);
|
|
break;
|
|
case h3Mode:
|
|
ret = gemtextParserSend(parser, h3Line, lq);
|
|
break;
|
|
case listMode:
|
|
ret = gemtextParserSend(parser, listLine, lq);
|
|
break;
|
|
}
|
|
if (ret) return ret;
|
|
line = calloc(1, sizeof(gemtextLine));
|
|
if (line == NULL) return errno;
|
|
line->lineType = endOfStream;
|
|
line->prev = line->next = NULL;
|
|
line->str = NULL;
|
|
gemtextLineQueuePush(lq, line);
|
|
break;
|
|
}
|
|
switch (parser->mode) {
|
|
case normalMode:
|
|
ret = parseNormal(parser, lq, c);
|
|
break;
|
|
case preformattedMode:
|
|
ret = parsePreformatted(parser, lq, c);
|
|
break;
|
|
case quoteMode:
|
|
ret = parseQuote(parser, lq, c);
|
|
break;
|
|
case linkMode:
|
|
ret = parseLink(parser, lq, c);
|
|
break;
|
|
case h1Mode:
|
|
ret = parseGeneric(parser, lq, h1Line, c);
|
|
break;
|
|
case h2Mode:
|
|
ret = parseGeneric(parser, lq, h2Line, c);
|
|
break;
|
|
case h3Mode:
|
|
ret = parseGeneric(parser, lq, h3Line, c);
|
|
break;
|
|
case listMode:
|
|
ret = parseGeneric(parser, lq, listLine, c);
|
|
break;
|
|
}
|
|
if (ret) {
|
|
logParseError(ret);
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|