# 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