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commander_parse.bas
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commander_parse.bas
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' Copyright (c) 2013, William Breathitt Gray
' All rights reserved.
'
' Redistribution and use in source and binary forms, with or without modification,
' are permitted provided that the following conditions are met:
'
' Redistributions of source code must retain the above copyright notice, this
' list of conditions and the following disclaimer.
'
' Redistributions in binary form must reproduce the above copyright notice, this
' list of conditions and the following disclaimer in the documentation and/or
' other materials provided with the distribution.
'
' THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
' ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
' WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
' DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
' ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
' (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
' LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
' ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
' (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
' SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
DIM xPos AS INTEGER = 1
DIM yPos AS INTEGER = 1
' MAP LEGEND:
' 0 = empty space
' 1 = a stone wall
' 2 = a locked door
' 3 = an old KEY
DIM legend(4) AS STRING = { "empty space", _
"a stone wall", _
"a locked door", _
"an old KEY" }
DIM map(9, 9) AS INTEGER = { { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, _
{ 1, 0, 1, 0, 0, 0, 0, 0, 0, 1 }, _
{ 1, 0, 1, 1, 0, 1, 1, 1, 0, 1 }, _
{ 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 }, _
{ 1, 0, 0, 0, 0, 0, 0, 0, 0, 2 }, _
{ 1, 0, 1, 1, 1, 1, 1, 0, 1, 1 }, _
{ 1, 0, 1, 0, 0, 0, 1, 0, 1, 1 }, _
{ 1, 0, 1, 0, 3, 0, 0, 0, 0, 1 }, _
{ 1, 0, 1, 0, 0, 0, 1, 1, 0, 1 }, _
{ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 } }
' item in player's hand
DIM hand AS INTEGER = 0
PRINT "THE MUNDANE ADVENTURE OF COMMANDER PARSE"
PRINT "========================================"
WHILE 1=1
' Get command from player
DIM cmd AS STRING
INPUT "> ", cmd
' Capitalize all letters to make it easier to parse
cmd = UCase(cmd)
' Parse command
IF Left(cmd, 2) = "GO" THEN
' Get direction and trim off leading spaces
DIM direction AS STRING = LTrim(Mid(cmd, 3))
' Parse direction
IF Left(direction, 5) = "NORTH" THEN
IF map(yPos-1, xPos) = 0 THEN
yPos = yPos - 1
ELSE
PRINT "Your path is blocked by "; legend(map(yPos-1, xPos)); "."
END IF
ELSEIF Left(direction, 4) = "EAST" THEN
IF map(yPos, xPos+1) = 0 THEN
xPos = xPos + 1
ELSE
PRINT "Your path is blocked by "; legend(map(yPos, xPos+1)); "."
END IF
ELSEIF Left(direction, 5) = "SOUTH" THEN
IF map(yPos+1, xPos) = 0 THEN
yPos = yPos + 1
ELSE
PRINT "Your path is blocked by "; legend(map(yPos+1, xPos)); "."
END IF
ELSEIF Left(direction, 4) = "WEST" THEN
IF map(yPos, xPos-1) = 0 THEN
xPos = xPos - 1
ELSE
PRINT "Your path is blocked by "; legend(map(yPos, xPos-1)); "."
END IF
ELSE
PRINT "GO where?"
END IF
ELSEIF Left(cmd, 4) = "GRAB" THEN
' Get item name and trim off leading spaces
DIM item AS STRING = LTrim(Mid(cmd, 5))
' Parse item
IF Left(item, 3) = "KEY" THEN
' Look around for a key
IF map(yPos-1, xPos) = 3 THEN
hand = 3
map(yPos-1, xPos) = 0
PRINT "You pick up "; legend(hand); "."
ELSEIF map(yPos, xPos+1) = 3 THEN
hand = 3
map(yPos, xPos+1) = 0
PRINT "You pick up "; legend(hand); "."
ELSEIF map(yPos+1, xPos) = 3 THEN
hand = 3
map(yPos+1, xPos) = 0
PRINT "You pick up "; legend(hand); "."
ELSEIF map(yPos, xPos-1) = 3 THEN
hand = 3
map(yPos, xPos-1) = 0
PRINT "You pick up "; legend(hand); "."
ELSE
PRINT "What KEY?"
END IF
ELSE
PRINT "GRAB what?"
END IF
ELSEIF Left(cmd, 4) = "HELP" THEN
PRINT "The following commands are available:"
PRINT " GO - Move in a specified direction"
PRINT " GRAB - Grab a specified item"
PRINT " HELP - Display this help"
PRINT " LOOK - Look around current position"
PRINT " QUIT - Quit from the game"
PRINT " USE - Use the current item in your hand"
ELSEIF Left(cmd, 4) = "LOOK" THEN
PRINT "You see "; legend(map(yPos-1, xPos)); " to the NORTH."
PRINT "You see "; legend(map(yPos, xPos+1)); " to the EAST."
PRINT "You see "; legend(map(yPos+1, xPos)); " to the SOUTH."
PRINT "You see "; legend(map(yPos, xPos-1)); " to the WEST."
ELSEIF Left(cmd, 4) = "QUIT" THEN
PRINT "Bye!"
EXIT WHILE
ELSEIF Left(cmd, 3) = "USE" THEN
PRINT "You try to USE "; legend(hand); "."
' Determine item in hand
IF hand = 3 THEN
' Look around for a locked door
IF map(yPos-1, xPos) = 2 THEN
PRINT "You unlock the door."
PRINT "You won the game!"
EXIT WHILE
ELSEIF map(yPos, xPos+1) = 2 THEN
PRINT "You unlock the door."
PRINT "You won the game!"
EXIT WHILE
ELSEIF map(yPos+1, xPos) = 2 THEN
PRINT "You unlock the door."
PRINT "You won the game!"
EXIT WHILE
ELSEIF map(yPos, xPos-1) = 2 THEN
PRINT "You unlock the door."
PRINT "You won the game!"
EXIT WHILE
ELSE
PRINT "There are no locked doors near you."
END IF
ELSE
PRINT "Nothing happens."
END IF
ELSE
PRINT "You cannot "; cmd; "."
END IF
WEND