extract-text-from-table.c

#include <lexbor/html/html.h>
#include <lexbor/css/css.h>
#include <lexbor/selectors/selectors.h>


lxb_status_t
callback(const lxb_char_t *data, size_t len, void *ctx)
{
    printf("%.*s", (int) len, (const char *) data);

    return LXB_STATUS_OK;
}

lxb_status_t
find_callback(lxb_dom_node_t *node, lxb_css_selector_specificity_t *spec,
              void *ctx)
{
    return lxb_html_serialize_deep_cb(node, callback, NULL);
}

int main(void) {
    lxb_status_t status;
    lxb_dom_node_t *body;
    lxb_html_document_t *document;
    lxb_css_parser_t *parser;
    lxb_selectors_t *selectors;
    lxb_css_selector_list_t *list;

    static const lxb_char_t html[] = "<table><tr>\n"
    "<th headers=\"1.h.1.1\" id=\"press1.r.1.1.1\"><p class=\"sub2\">Food at home</p></th>\n"
    "<td headers=\"1.h.1.2\"><span class=\"datavalue\">7.652</span></td>\n"
    "<td headers=\"1.h.1.3 press1.h.2.3\"><span class=\"datavalue\">251.369</span></td>\n"
    "<td headers=\"1.h.1.3 press1.h.2.4\"><span class=\"datavalue\">259.825</span></td>\n"
    "<td headers=\"1.h.1.3 press1.h.2.5\"><span class=\"datavalue\">262.695</span></td>\n"
    "<td headers=\"1.h.1.6 press1.h.2.6\"><span class=\"datavalue\">4.5</span></td>\n"
    "<td headers=\"1.h.1.6 press1.h.2.7\"><span class=\"datavalue\">1.1</span></td>\n"
    "<td headers=\"1.h.1.8 press1.h.2.8\"><span class=\"datavalue\">0.7</span></td>\n"
    "<td headers=\"1.h.1.8 press1.h.2.9\"><span class=\"datavalue\">0.4</span></td>\n"
    "<td headers=\"1.h.1.8 press1.h.2.10\"><span class=\"datavalue\">1.2</span></td>\n"
    "</tr></table>";

    static const lxb_char_t slctrs[] = "tr > td[headers = '1.h.1.8 press1.h.2.10'] > .datavalue";
    /*
     * OR
     * static const lxb_char_t slctrs[] = "tr > td:last-child .datavalue";
     * OR
     * static const lxb_char_t slctrs[] = "tr td[headers *= 'press1.h.2.10'] span.datavalue";
     * OR
     * ...
     */

    document = lxb_html_document_create();
    if (document == NULL) {
        return EXIT_FAILURE;
    }

    status = lxb_html_document_parse(document, html, sizeof(html) - 1);
    if (status != LXB_STATUS_OK) {
        return EXIT_FAILURE;
    }

    /* Create CSS parser. */

    parser = lxb_css_parser_create();
    status = lxb_css_parser_init(parser, NULL, NULL);
    if (status != LXB_STATUS_OK) {
        return EXIT_FAILURE;
    }

    /* Selectors. */

    selectors = lxb_selectors_create();
    status = lxb_selectors_init(selectors);
    if (status != LXB_STATUS_OK) {
        return EXIT_FAILURE;
    }

    list = lxb_css_selectors_parse(parser, slctrs, sizeof(slctrs) - 1);
    if (parser->status != LXB_STATUS_OK) {
        return EXIT_FAILURE;
    }

    /* Find DOM/HTML nodes by selectors. */

    body = lxb_dom_interface_node(lxb_html_document_body_element(document));
    if (body == NULL) {
        return EXIT_FAILURE;
    }

//    lxb_html_serialize_deep_cb(body, callback, NULL);

    status = lxb_selectors_find(selectors, body, list, find_callback, NULL);
    if (status != LXB_STATUS_OK) {
        return EXIT_FAILURE;
    }

    printf("\n");

    /* Destroy Selectors object. */
    (void) lxb_selectors_destroy(selectors, true);

    /* Destroy resources for CSS Parser. */
    (void) lxb_css_parser_destroy(parser, true);

    /* Destroy all Selector List memory. */
    lxb_css_selector_list_destroy_memory(list);

    /* Destroy HTML Document. */
    lxb_html_document_destroy(document);

    return 0;
}