tsearch2::separate_query_and_operators (private)

 tsearch2::separate_query_and_operators [ -query query ]

Defined in packages/tsearch2-driver/tcl/tsearch2-driver-procs.tcl

Separates special operators from full text query

Switches:

-query

(optional)

Returns:

list of query and operators

Error:

Author:

Dave Bauer <dave@thedesignexperience.org>

Created:

2004-07-10

Partial Call Graph (max 5 caller/called nodes):

Testcases:

No testcase defined.

Source code:

    # remove evil characters
    regsub {\[|\]|\{|\}} $query {} query

    # match quotes
    set quote_count [regexp -all {\"} $query]
    # if quotes don't match, just remove all of them
    if {$quote_count % 2 == 1} {
        regsub -all {\"} $query {} query
    }

    set main_query ""
    set operators ""
    set last_operator ""
    set start_q 0
    set end_q 0
    set valid_operators [tsearch2_driver::valid_operators]
    foreach e [split $query] {
        if {[regexp {(^\w*):} $e discard operator]
            && $operator in $valid_operators
        } {
            # query element contains an operator, split operator from
            # query fragment
            set e [split $e ":"]
            set e [list $operator [lindex $e 1]]
        }
        # count quotes to see if this element
        # is part of a phrase
        if {$start_q ne 1} {
            set start_q [regexp {^\"} $e]
        }
        set end_q [regexp {\"$} $e]

        if {$start_q} {
            set sq {"}
        } else {
            set sq {}
        }
        if {$end_q} {
            set start_q 0
            set eq {"}
        } else {
            set eq {}
        }

        # now that we know if its parts of a phrase, get rid of the
        # quotes
        regsub -all {\"} $e {} e

        if {[llength $e] > 1} {
            # query element contains a valid operator
            lassign $e last_operator e
        } else {
            set last_operator ""
        }
        # regular search term
        ns_log debug "operator(e)='${e}' start_q=$start_q end_q=$end_q"
        if {$last_operator ne ""} {
            # FIXME need introspection for operator phrase support
            if {
                ($last_operator eq "title:" || $last_operator eq "description:")
                && ($start_q || $end_q)
            } {
                lappend ${last_operator}_phrase [regsub -all {\"} $e {}]
            } else {
                lappend $last_operator [regsub -all {\"} ${e} {}]
            }
        } else {
            if {$start_q || $end_q} {
                lappend phrase $e
            } else {
                lappend main_query $e
            }
        }
    }

    foreach op $valid_operators {
        if {[info exists $op] && [set $op] ne ""} {
            lappend operators $op $title
        }
    }
    lappend result $main_query
    if {$operators ne ""} {
        lappend result $operators
    }
    return $result

XQL Not present:

Generic, Oracle

PostgreSQL XQL file:

packages/tsearch2-driver/tcl/tsearch2-driver-procs-postgresql.xql