# 2014 Jan 08
#
# 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.
#
#***********************************************************************
#
# Tests focused on the NEAR operator.
#

source [file join [file dirname [info script]] fts5_common.tcl]
set testprefix fts5near

# If SQLITE_ENABLE_FTS5 is not defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

proc do_near_test {tn doc near res} {
  uplevel [list do_execsql_test $tn "
    DELETE FROM t1;
    INSERT INTO t1 VALUES('$doc');
    SELECT count(*) FROM t1 WHERE t1 MATCH '$near';
  " $res]
}

execsql { 
  CREATE VIRTUAL TABLE t1 USING fts5(x, tokenize = "ascii tokenchars '.'") 
}

do_near_test 1.1 ". . a . . . b . ." { NEAR(a b, 5) } 1
do_near_test 1.2 ". . a . . . b . ." { NEAR(a b, 4) } 1
do_near_test 1.3 ". . a . . . b . ." { NEAR(a b, 3) } 1
do_near_test 1.4 ". . a . . . b . ." { NEAR(a b, 2) } 0

do_near_test 1.5 ". . a . . . b . ." { NEAR(b a, 5) } 1
do_near_test 1.6 ". . a . . . b . ." { NEAR(b a, 4) } 1
do_near_test 1.7 ". . a . . . b . ." { NEAR(b a, 3) } 1
do_near_test 1.8 ". . a . . . b . ." { NEAR(b a, 2) } 0

do_near_test 1.9  ". a b . . . c . ." { NEAR("a b" c, 3) } 1
do_near_test 1.10 ". a b . . . c . ." { NEAR("a b" c, 2) } 0
do_near_test 1.11 ". a b . . . c . ." { NEAR(c "a b", 3) } 1
do_near_test 1.12 ". a b . . . c . ." { NEAR(c "a b", 2) } 0

do_near_test 1.13 ". a b . . . c d ." { NEAR(a+b c+d, 3) } 1
do_near_test 1.14 ". a b . . . c d ." { NEAR(a+b c+d, 2) } 0
do_near_test 1.15 ". a b . . . c d ." { NEAR(c+d a+b, 3) } 1
do_near_test 1.16 ". a b . . . c d ." { NEAR(c+d a+b, 2) } 0

do_near_test 1.17 ". a b . . . c d ." { NEAR(a b c d, 5) } 1
do_near_test 1.18 ". a b . . . c d ." { NEAR(a b c d, 4) } 0
do_near_test 1.19 ". a b . . . c d ." { NEAR(a+b c d, 4) } 1

do_near_test 1.20 "a b c d e f g h i" { NEAR(b+c a+b+c+d i, 5) } 1
do_near_test 1.21 "a b c d e f g h i" { NEAR(b+c a+b+c+d i, 4) } 0

do_near_test 1.22 "a b c d e f g h i" { NEAR(a+b+c+d i b+c, 5) } 1
do_near_test 1.23 "a b c d e f g h i" { NEAR(a+b+c+d i b+c, 4) } 0

do_near_test 1.24 "a b c d e f g h i" { NEAR(i a+b+c+d b+c, 5) } 1
do_near_test 1.25 "a b c d e f g h i" { NEAR(i a+b+c+d b+c, 4) } 0


finish_test