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third_party/sqlite/src/test/fts3_common.tcl

Index: third_party/sqlite/src/test/fts3_common.tcl
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+# 2009 November 04
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# This file contains common code used the fts3 tests. At one point
+# equivalent functionality was implemented in C code. But it is easier
+# to use Tcl.
+#
+
+#-------------------------------------------------------------------------
+# USAGE: fts3_integrity_check TBL
+#
+# This proc is used to verify that the full-text index is consistent with
+# the contents of the fts3 table. In other words, it checks that the
+# data in the %_contents table matches that in the %_segdir and %_segments 
+# tables.
+#
+# This is not an efficient procedure. It uses a lot of memory and a lot
+# of CPU. But it is better than not checking at all.
+#
+# The procedure is:
+#
+#   1) Read the entire full-text index from the %_segdir and %_segments
+#      tables into memory. For each entry in the index, the following is
+#      done:
+#
+#          set C($iDocid,$iCol,$iPosition) $zTerm
+#
+#   2) Iterate through each column of each row of the %_content table. 
+#      Tokenize all documents, and check that for each token there is
+#      a corresponding entry in the $C array. After checking a token,
+#      [unset] the $C array entry.
+#
+#   3) Check that array $C is now empty.
+#      
+#
+proc fts3_integrity_check {tbl} {
+
+  fts3_read2 $tbl 1 A
+
+  foreach zTerm [array names A] {
+    foreach doclist $A($zTerm) {
+      set docid 0
+      while {[string length $doclist]>0} {
+        set iCol 0
+        set iPos 0
+        set lPos [list]
+        set lCol [list]
+
+        # First varint of a doclist-entry is the docid. Delta-compressed
+        # with respect to the docid of the previous entry.
+        #
+        incr docid [gobble_varint doclist]
+        if {[info exists D($zTerm,$docid)]} {
+          while {[set iDelta [gobble_varint doclist]] != 0} {}
+          continue
+        }
+        set D($zTerm,$docid) 1
+
+        # Gobble varints until the 0x00 that terminates the doclist-entry
+        # is found.
+        while {[set iDelta [gobble_varint doclist]] > 0} {
+          if {$iDelta == 1} {
+            set iCol [gobble_varint doclist]
+            set iPos 0
+          } else {
+            incr iPos $iDelta
+            incr iPos -2
+            set C($docid,$iCol,$iPos) $zTerm
+          }
+        }
+      }
+    }
+  }
+
+  foreach key [array names C] {
+    #puts "$key -> $C($key)"
+  }
+
+
+  db eval "SELECT * FROM ${tbl}_content" E {
+    set iCol 0
+    set iDoc $E(docid)
+    foreach col [lrange $E(*) 1 end] {
+      set c $E($col)
+      set sql {SELECT fts3_tokenizer_test('simple', $c)}
+
+      foreach {pos term dummy} [db one $sql] {
+        if {![info exists C($iDoc,$iCol,$pos)]} {
+          set es "Error at docid=$iDoc col=$iCol pos=$pos. Index is missing"
+          lappend errors $es
+        } else {
+          if {$C($iDoc,$iCol,$pos) != "$term"} {
+            set    es "Error at docid=$iDoc col=$iCol pos=$pos. Index "
+            append es "has \"$C($iDoc,$iCol,$pos)\", document has \"$term\""
+            lappend errors $es
+          }
+          unset C($iDoc,$iCol,$pos)
+        }
+      }
+      incr iCol
+    }
+  }
+
+  foreach c [array names C] {
+    lappend errors "Bad index entry: $c -> $C($c)"
+  }
+
+  if {[info exists errors]} { return [join $errors "\n"] }
+  return "ok"
+}
+
+# USAGE: fts3_terms TBL WHERE
+#
+# Argument TBL must be the name of an FTS3 table. Argument WHERE is an
+# SQL expression that will be used as the WHERE clause when scanning
+# the %_segdir table. As in the following query:
+#
+#   "SELECT * FROM ${TBL}_segdir WHERE ${WHERE}"
+#
+# This function returns a list of all terms present in the segments
+# selected by the statement above.
+#
+proc fts3_terms {tbl where} {
+  fts3_read $tbl $where a
+  return [lsort [array names a]]
+}
+
+
+# USAGE: fts3_doclist TBL TERM WHERE
+#
+# Argument TBL must be the name of an FTS3 table. TERM is a term that may
+# or may not be present in the table. Argument WHERE is used to select a 
+# subset of the b-tree segments in the associated full-text index as 
+# described above for [fts3_terms].
+#
+# This function returns the results of merging the doclists associated
+# with TERM in the selected segments. Each doclist is an element of the
+# returned list. Each doclist is formatted as follows:
+#
+#   [$docid ?$col[$off1 $off2...]?...]
+#
+# The formatting is odd for a Tcl command in order to be compatible with
+# the original C-language implementation. If argument WHERE is "1", then 
+# any empty doclists are omitted from the returned list.
+#
+proc fts3_doclist {tbl term where} {
+  fts3_read $tbl $where a
+
+
+  foreach doclist $a($term) {
+    set docid 0
+
+    while {[string length $doclist]>0} {
+      set iCol 0
+      set iPos 0
+      set lPos [list]
+      set lCol [list]
+      incr docid [gobble_varint doclist]
+  
+      while {[set iDelta [gobble_varint doclist]] > 0} {
+        if {$iDelta == 1} {
+          lappend lCol [list $iCol $lPos]
+          set iPos 0
+          set lPos [list]
+          set iCol [gobble_varint doclist]
+        } else {
+          incr iPos $iDelta
+          incr iPos -2
+          lappend lPos $iPos
+        }
+      }
+  
+      if {[llength $lPos]>0} {
+        lappend lCol [list $iCol $lPos]
+      }
+  
+      if {$where != "1" || [llength $lCol]>0} {
+        set ret($docid) $lCol
+      } else {
+        unset -nocomplain ret($docid)
+      }
+    }
+  }
+
+  set lDoc [list]
+  foreach docid [lsort -integer [array names ret]] {
+    set lCol [list]
+    set cols ""
+    foreach col $ret($docid) {
+      foreach {iCol lPos} $col {}
+      append cols " $iCol\[[join $lPos { }]\]"
+    }
+    lappend lDoc "\[${docid}${cols}\]"
+  }
+
+  join $lDoc " "
+}
+
+###########################################################################
+
+proc gobble_varint {varname} {
+  upvar $varname blob
+  set n [read_fts3varint $blob ret]
+  set blob [string range $blob $n end]
+  return $ret
+}
+proc gobble_string {varname nLength} {
+  upvar $varname blob
+  set ret [string range $blob 0 [expr $nLength-1]]
+  set blob [string range $blob $nLength end]
+  return $ret
+}
+
+# The argument is a blob of data representing an FTS3 segment leaf. 
+# Return a list consisting of alternating terms (strings) and doclists
+# (blobs of data).
+#
+proc fts3_readleaf {blob} {
+  set zPrev ""
+  set terms [list]
+
+  while {[string length $blob] > 0} {
+    set nPrefix [gobble_varint blob]
+    set nSuffix [gobble_varint blob]
+
+    set zTerm [string range $zPrev 0 [expr $nPrefix-1]]
+    append zTerm [gobble_string blob $nSuffix]
+    set doclist [gobble_string blob [gobble_varint blob]]
+
+    lappend terms $zTerm $doclist
+    set zPrev $zTerm
+  }
+
+  return $terms
+}
+
+proc fts3_read2 {tbl where varname} {
+  upvar $varname a
+  array unset a
+  db eval " SELECT start_block, leaves_end_block, root 
+            FROM ${tbl}_segdir WHERE $where
+            ORDER BY level ASC, idx DESC
+  " {
+    if {$start_block == 0} {
+      foreach {t d} [fts3_readleaf $root] { lappend a($t) $d }
+    } else {
+      db eval " SELECT block 
+                FROM ${tbl}_segments 
+                WHERE blockid>=$start_block AND blockid<=$leaves_end_block
+                ORDER BY blockid
+      " {
+        foreach {t d} [fts3_readleaf $block] { lappend a($t) $d }
+
+      }
+    }
+  }
+}
+
+proc fts3_read {tbl where varname} {
+  upvar $varname a
+  array unset a
+  db eval " SELECT start_block, leaves_end_block, root 
+            FROM ${tbl}_segdir WHERE $where
+            ORDER BY level DESC, idx ASC
+  " {
+    if {$start_block == 0} {
+      foreach {t d} [fts3_readleaf $root] { lappend a($t) $d }
+    } else {
+      db eval " SELECT block 
+                FROM ${tbl}_segments 
+                WHERE blockid>=$start_block AND blockid<$leaves_end_block
+                ORDER BY blockid
+      " {
+        foreach {t d} [fts3_readleaf $block] { lappend a($t) $d }
+
+      }
+    }
+  }
+}
+
+##########################################################################
+