Description
bool
yaz_ccl_parse ( resource id, string query, array &result )
This function invokes a CCL parser. It converts a given
CCL FIND query to an RPN query which may be passed to the
yaz_search() function to perform a search.
To define a set of valid CCL fields call
yaz_ccl_conf() prior to this function.
If the supplied query was successfully
converted to RPN, this function returns TRUE, and the index
rpn of the supplied array
result holds a valid RPN query.
If the query could not be converted (because of invalid syntax,
unknown field, etc.) this function returns FALSE and three
indexes are set in the resulting array to indicate the cause
of failure: errorcode CCL error code (integer),
errorstring CCL error string, and
errorpos approximate position in query of failure
(integer is character position).
Example 1. CCL Parsing We will try to search using CCL. In the example below,
$ccl is a CCL query.
<?php
yaz_ccl_conf($id, $fields); // see example for yaz_ccl_conf
if (!yaz_ccl_parse($id, $ccl, &$cclresult)) {
echo 'Error: ' . $cclresult["errorstring"];
} else {
$rpn = $cclresult["rpn"];
yaz_search($id, "rpn", $rpn);
}
?>
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