Function xmlXPathNormalizeFunction

ThirdParty/libxml2/vtklibxml2/xpath.c:8230–8272

* xmlXPathNormalizeFunction: * @ctxt: the XPath Parser context * @nargs: the number of arguments * * Implement the normalize-space() XPath function * string normalize-space(string?) * The normalize-space function returns the argument string with white * space normalized by stripping leading and trailing whitespace * and replacing sequences of whitespace characters by a single * space

 * node converted to a string, in other words the value of the context node.
 */
void
xmlXPathNormalizeFunction(xmlXPathParserContextPtr ctxt, int nargs) {
    xmlChar *source, *target;
    int blank;

    if (ctxt == NULL) return;
    if (nargs == 0) {
        /* Use current context node */
        source = xmlXPathCastNodeToString(ctxt->context->node);
        if (source == NULL)
            xmlXPathPErrMemory(ctxt);
        valuePush(ctxt, xmlXPathCacheWrapString(ctxt, source));
        nargs = 1;
    }

    CHECK_ARITY(1);
    CAST_TO_STRING;
    CHECK_TYPE(XPATH_STRING);
    source = ctxt->value->stringval;
    if (source == NULL)
        return;
    target = source;

    /* Skip leading whitespaces */
    while (IS_BLANK_CH(*source))
        source++;

    /* Collapse intermediate whitespaces, and skip trailing whitespaces */
    blank = 0;
    while (*source) {
        if (IS_BLANK_CH(*source)) {
	    blank = 1;
        } else {
            if (blank) {
                *target++ = 0x20;
                blank = 0;
            }
            *target++ = *source;
        }
        source++;
    }
    *target = 0;
}

/**
 * xmlXPathTranslateFunction: