# 2007 May 14

 #

 # 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 implements regression tests for SQLite library.  The

 # focus of this file is testing the built-in SUBSTR() functions.

 #

 # $Id: substr.test,v 1.3 2007/10/12 19:11:55 drh Exp $

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 ifcapable !tclvar {

   finish_test

   return

 }

 # Create a table to work with.

 #

 execsql { 

   CREATE TABLE t1(t text, b blob)

 }

 proc substr-test {id string i1 i2 result} {

   db eval {

     DELETE FROM t1;

     INSERT INTO t1(t) VALUES($string)

   }

   do_test substr-$id.1 [subst {

     execsql {

       SELECT substr(t, $i1, $i2) FROM t1

     }

   }] [list $result]

   set qstr '[string map {' ''} $string]'

   do_test substr-$id.2 [subst {

     execsql {

       SELECT substr($qstr, $i1, $i2)

     }

   }] [list $result]

 }

 proc subblob-test {id hex i1 i2 hexresult} {

   db eval "

     DELETE FROM t1;

     INSERT INTO t1(b) VALUES(x'$hex')

   "

   do_test substr-$id.1 [subst {

     execsql {

       SELECT hex(substr(b, $i1, $i2)) FROM t1

     }

   }] [list $hexresult]

   do_test substr-$id.2 [subst {

     execsql {

       SELECT hex(substr(x'$hex', $i1, $i2))

     }

   }] [list $hexresult]

 }

 # Basic SUBSTR functionality

 #

 substr-test 1.1 abcdefg 1 1 a

 substr-test 1.2 abcdefg 2 1 b

 substr-test 1.3 abcdefg 1 2 ab

 substr-test 1.4 abcdefg 1 100 abcdefg

 substr-test 1.5 abcdefg 0 1 a

 substr-test 1.6 abcdefg -1 1 g

 substr-test 1.7 abcdefg -1 10 g

 substr-test 1.8 abcdefg -5 3 cde

 substr-test 1.9 abcdefg -7 3 abc

 substr-test 1.10 abcdefg -100 98 abcde

 # Make sure everything works with long unicode characters

 #

 substr-test 2.1 \u1234\u2345\u3456 1 1 \u1234

 substr-test 2.2 \u1234\u2345\u3456 2 1 \u2345

 substr-test 2.3 \u1234\u2345\u3456 1 2 \u1234\u2345

 substr-test 2.4 \u1234\u2345\u3456 -1 1 \u3456

 substr-test 2.5 a\u1234b\u2345c\u3456c -5 3 b\u2345c

 # Basic functionality for BLOBs

 #

 subblob-test 3.1 61626364656667 1 1 61

 subblob-test 3.2 61626364656667 2 1 62

 subblob-test 3.3 61626364656667 1 2 6162

 subblob-test 3.4 61626364656667 1 100 61626364656667

 subblob-test 3.5 61626364656667 0 1 61

 subblob-test 3.6 61626364656667 -1 1 67

 subblob-test 3.7 61626364656667 -1 10 67

 subblob-test 3.8 61626364656667 -5 3 636465

 subblob-test 3.9 61626364656667 -7 3 616263

 subblob-test 3.10 61626364656667 -100 98 6162636465

 # If these blobs were strings, then they would contain multi-byte

 # characters.  But since they are blobs, the substr indices refer

 # to bytes.

 #

 subblob-test 4.1 61E188B462E28D8563E3919663 1 1 61

 subblob-test 4.2 61E188B462E28D8563E3919663 2 1 E1

 subblob-test 4.3 61E188B462E28D8563E3919663 1 2 61E1

 subblob-test 4.4 61E188B462E28D8563E3919663 -2 1 96

 subblob-test 4.5 61E188B462E28D8563E3919663 -5 4 63E39196

 subblob-test 4.6 61E188B462E28D8563E3919663 -100 98 61E188B462E28D8563E391 

 # Two-argument SUBSTR

 #

 proc substr-2-test {id string idx result} {

   db eval {

     DELETE FROM t1;

     INSERT INTO t1(t) VALUES($string)

   }

   do_test substr-$id.1 [subst {

     execsql {

       SELECT substr(t, $idx) FROM t1

     }

   }] [list $result]

   set qstr '[string map {' ''} $string]'

   do_test substr-$id.2 [subst {

     execsql {

       SELECT substr($qstr, $idx)

     }

   }] [list $result]

 }

 substr-2-test 5.1 abcdefghijklmnop 5 efghijklmnop

 substr-2-test 5.2 abcdef -5 bcdef

 finish_test