[bb] String/Int/Float evaluator for withing Blitz by skn3 [ 1+ years ago ]

[BlitzBot]

Title : String/Int/Float evaluator for withing Blitz
Author : skn3
Posted : 1+ years ago

Description : Give the function a string containing an expression. This could be something like..

calculate$("20+5")

calculate$("5*(500^3+(-4+55)/2)+1")

calculate$(" "age" + 18 ")

i have tried to emulate the way blitz operated perfectly.  

Code :

Code (blitzbasic) Select Expand

;To use this function everything is required apart from
;the part in the ----test---- section.

;To call it all you have to do is calculate$("expression")

;The function returns a string, but can work with floats / ints and strings.
;I am sure it 100% replicates blitz's expression system without of course the
;LOGIC gates.

;have fun :)


;---[ Operators ]------------------
Const OpTotal=5
Dim op$(OpTotal)
op$(1)="^";POW
op$(2)="*";MUL
op$(3)="/";DIV
op$(4)="+";ADD
op$(5)="-";SUB

;---[ Reserverd ]------------------
Const ResTotal=11
Dim res$(ResTotal)
res$(1)="0"
res$(2)="1"
res$(3)="2"
res$(4)="3"
res$(5)="4"
res$(6)="5"
res$(7)="6"
res$(8)="7"
res$(9)="8"
   res$(10)="9"
   res$(11)="."

;---[  Special  ]------------------
Global SPEC_quote$=Chr$(34)

;---[  Error's  ]------------------
Dim ers$(8)
ers$(1)="Unexpected ')'"
ers$(2)="Expecting expression"
ers$(3)="Expecting operator"
ers$(4)="Ilegal character"
ers$(5)="Missing ')'"
ers$(6)="Missing " + SPEC_quote$ + " end quote"
ers$(7)="Value types incorrect"
ers$(8)="Result of expression out of range"



;---Test---
;---Test---
;---Test---
.restart
Print "Type an expression"
Print "(strings work aswell EG "+Chr$(34)+"hel"+Chr$(34)+"+"+Chr$(34)+"lo"+Chr$(34)+")
Print ""
ask$=Input$(">")
Write ask$ + " = "
Color 255,0,0

Print calculate$(ask$)
Color 255,255,255
Print ""
Goto restart
;-----------
;-----------
;-----------



Function error(message$)
;temp error message
RuntimeError message$ + "  AT:line " + GLOBAL_line
End Function

Function calculate$(sum$)
BRAK_x=1
BRAK_found=0
BRAK_getchar$=""
BRAK_mode=False
BRAK_marker=1

;--[ Info ] ----
;This loop cycles through the string 'sum$' finding the
;highest bracket. Once it finds it will calculate within the bracket.
;With the result from that calculation, it replaces the (x) bracket
;and its contense wit hthe result of the calculation.
Repeat
;Get character from 'sum$' using the offset of 'BRAK_x'
BRAK_getchar$=Mid$(sum$,BRAK_x,1)
;Test character's properties
If BRAK_mode=False Then
If BRAK_getchar$=SPEC_quote$ Then
BRAK_mode=True
BRAK_x=BRAK_x+1
ElseIf BRAK_getchar$="("
BRAK_found=BRAK_found+1
BRAK_marker=BRAK_x
BRAK_x=BRAK_x+1
ElseIf BRAK_getchar$=")"
;--< ERROR >--"Unexpected ')'"
If BRAK_found=0 Then
error ers$(1)
Else
If BRAK_x=BRAK_marker+1 Then
;--< ERROR >--"Expecting statement"
error ers$(2)
Else
;--[ Found suitable bracket ]----
;Calculate bracket contents
GET_left$=Left$(sum$,BRAK_marker-1)
GET_sum$=Mid$(sum$,BRAK_marker+1,BRAK_x-BRAK_marker-1)
GET_right$=Right$(sum$,Len(sum$)-BRAK_x)
sum$=GET_left$ + calculateSUB$(GET_sum$) + GET_right$
;reset values
BRAK_x=1
BRAK_found=BRAK_found-2
BRAK_marker=1
End If
End If
Else
If BRAK_x>Len(sum$) Then
If BRAK_found>0 Then
error ers$(5)
Else
;--[ Found end of sum sucessfully ]----
;check not end
;Calculate sum$
If Len(sum$)>2 Then
sum$=calculateSUB$(sum$)
End If
;END
Return sum$
End If
Else
BRAK_x=BRAK_x+1
End If
End If
Else
;--[ Info ] ----
;This section is to make sure quotes are read properly.
If BRAK_getchar$=SPEC_quote$ Then
BRAK_x=BRAK_x+1
BRAK_mode=False
Else
;--< ERROR >--"Unexpected End to statement"
If BRAK_x>=Len(sum$) Then
error ers$(6)
Else
BRAK_x=BRAK_x+1
End If
End If
End If

Forever
End Function






Function calculateSUB$(sum$)
CALC_x=1
CALC_mode=1
CALC_start=False
CALC_getchar$=""
CALC_makeTok$=""
CALC_marker=1

CALC_op$=""

CALC_val1$=""
CALC_readtype1$=""

CALC_val2$=""
CALC_readtype2$=""

CALC_type$=""
;---LOOP---
;This loop checks the entire sum in order of OP preferance
For TEST_loop=1 To optotal
Repeat
CALC_getchar$=Mid$(sum$,CALC_x,1)

If CALC_mode=1 Then
;expected end of statement
If CALC_x>Len(sum$) Then
CALC_x=1
CALC_start=False
Exit
End If
;Find start of first value
If CALC_Start=False Then
If CALC_getchar$=" " Then
CALC_x=CALC_x+1
Else
CALC_marker=CALC_x
;Detect type of value to read in
If CALC_getchar$=SPEC_quote$ Then
;IS a string
CALC_readtype1$="string"
CALC_start=True
CALC_maketok$=""
CALC_x=CALC_x+1
Else
;IS a value
CALC_readtype1$="value"
CALC_start=True
CALC_maketok$=""
End If
End If
Else
;---[ Parse value until operater is met ]------
If CALC_readtype1$="string" Then
;Looking for string
If CALC_getchar$=SPEC_quote$ Then
If CALC_x=Len(sum$) Then
CALC_x=1
CALC_start=False
Exit
Else
;Find operator after quote
GETSUB$=""
Repeat
CALC_x=CALC_x+1
If CALC_x=Len(sum$) Then
CALC_x=1
CALC_start=False
Exit
End If
GETSUB$=Mid$(sum$,CALC_x,1)
Until GETSUB$<>" "
;Character after quote has been found
;
;If character = add and test loop then continue
If op$(TEST_loop)=GETSUB$ Then
;Everything matches and is ready

;Check needs expression error
If CALC_x=Len(sum$) Then
error ers$(2)
Else
;SWITCH TO MODE 2
CALC_val1$=CALC_maketok$
CALC_op$=op$(4)
CALC_mode=2
CALC_x=CALC_x+1
CALC_maketok$=""
CALC_start=False
;Stop
End If
Else
;Character was not ADD
;(only OP that can follow a String)
;so check OP is valid
TEST_skip=False
For TEST_array=1 To optotal
If op$(TEST_array)=GETSUB$ Then
TEST_skip=True
Exit
End If
Next
If TEST_skip=True Then
CALC_start=False
CALC_x=CALC_x+1
Else
error ers$(4)
End If
End If
End If
Else
If CALC_x=Len(sum$) Then
error ers$(6)
Else
CALC_maketok$=CALC_maketok$+CALC_getchar$
CALC_x=CALC_x+1
End If
End If
Else
;Looking for int / float
;--[info]--
;Look For negative value symol First
If CALC_getchar$="-" And Len(CALC_maketok$)=0 Then
CALC_maketok$=CALC_maketok$+CALC_getchar$
If CALC_x=Len(sum$) Then
error ers$(2)
Else
CALC_x=CALC_x+1
End If
Else
;CALC_getchar$ is not a negative symbol
;of the number so detect reserved chars
TEST_found=False
For TEST_array=1 To restotal
If res$(TEST_array)=CALC_getchar$ Then
;Test to see if it turns INT into FLOAT
If TEST_Array=11 Then
If CALC_readtype1$="float" Then
;--< ERROR >--Float type already set extra '.'
error ers$(4)
Else
CALC_readtype1$="float"
End If
End If
TEST_found=True
Exit
End If
Next
;If Reserved character was met then add it to the token
If TEST_found=True Then
CALC_maketok$=CALC_maketok$+CALC_getchar$
CALC_x=CALC_x+1
Else
If op$(TEST_loop)=CALC_getchar$ Then
If Len(CALC_maketok$)=0 Then
error ers$(4)
Else


If CALC_x=Len(sum$) Then
error ers$(2)
Else
;set values
CALC_val1$=CALC_maketok$
CALC_op$=CALC_getchar$
CALC_mode=2
;reset values
CALC_start=False
CALC_x=CALC_x+1
CALC_maketok$=""
End If

End If
Else
;Make sure is proper character
TEST_found=False
For TEST_array=1 To optotal
If op$(TEST_array)=CALC_getchar$ Then
TEST_found=True
Exit
End If
Next

If TEST_found=True Then
;reset values
CALC_start=False
CALC_x=CALC_x+1
CALC_maketok$=""
CALC_readtype1$=""
Else
error ers$(4)
End If
End If
End If
End If
End If
End If

;---[ INFO ]--------------
;The all important condition.
;This will compare the two values and effect them with the
;VAL1 and the OP that was got in MODE1

ElseIf CALC_mode=2
If CALC_start=False Then
If CALC_getchar$=" " Then
CALC_x=CALC_x+1
Else
;Value 3=string
If CALC_getchar$=SPEC_quote$ Then
;set
CALC_readtype2$="string"
CALC_x=CALC_x+1
CALC_start=True
CALC_maketok$=""
Else
CALC_readtype2$="value"
CALC_start=True
CALC_maketok$=""
End If
End If
Else
;Parse until end
If CALC_readtype2$="string" Then
If CALC_getchar$=SPEC_quote$ Then
;----------------------
;VALUE found finish off
;----------------------
;End quote found so do sum and update
MAKE_left$=Left$(sum$,CALC_marker-1)
MAKE_right$=Right$(sum$,Len(sum$)-CALC_x)
MAKE_sum$=CALC_val1$+CALC_maketok$
sum$=MAKE_left$+SPEC_quote$+MAKE_sum$+SPEC_quote$+MAKE_right$
;reset
CALC_x=1
CALC_mode=1
CALC_start=False
CALC_type$=""
CALC_val1$=""
CALC_val2$=""
CALC_op$=""
CALC_readtype1$=""
CALC_readtype2$=""
CALC_maketok$=""
CALC_marker=1
Else
If CALC_x=Len(sum$) Then
CALC_x=1
CALC_start=False
End If
CALC_maketok$=CALC_maketok$+CALC_getchar$
CALC_x=CALC_x+1
End If
Else
;Look to make value negative ?
If CALC_getchar$="-" And Len(CALC_maketok$)=0 Then
CALC_maketok$=CALC_maketok$+CALC_getchar$
If CALC_x=Len(sum$) Then
error ers$(2)
Else
CALC_x=CALC_x+1
End If
Else
;Is character a reserved character
TEST_found=False
For TEST_array=1 To restotal
If res$(TEST_array)=CALC_getchar$ Then
TEST_found=True
If TEST_Array=11 Then
CALC_readtype2$="float"
End If
Exit
End If
Next
;Character matches reserved character
If TEST_found=True Then
If CALC_x=Len(sum$) Then
CALC_maketok$=CALC_maketok$+CALC_getchar$
;----------------------
;VALUE found finish off
;----------------------
MAKE_left$=Left$(sum$,CALC_marker-1)
MAKE_right$=Right$(sum$,Len(sum$)-CALC_x)
CALC_val2$=CALC_maketok$

If CALC_readtype1$="string" Then
MAKE_sum$=CALC_val1$+CALC_val2$
sum$=MAKE_left$+SPEC_quote$+MAKE_sum$+SPEC_quote$+MAKE_right$
Else
If CALC_readtype1$="value" Then
Select CALC_op$
Case op$(1);POW
MAKE_sum$=(Int(CALC_val1$)^Int(CALC_val2$))
Case op$(2);MUL
MAKE_sum$=(Int(CALC_val1$)*Int(CALC_val2$))
Case op$(3);DIV
MAKE_sum$=(Int(CALC_val1$)/Int(CALC_val2$))
Case op$(4);ADD
MAKE_sum$=(Int(CALC_val1$)+Int(CALC_val2$))
Case op$(5);SUB
MAKE_sum$=(Int(CALC_val1$)-Int(CALC_val2$))
End Select
Else
Select CALC_op$
Case op$(1);POW
MAKE_sum$=(Float#(CALC_val1$)^Float#(CALC_val2$))
Case op$(2);MUL
MAKE_sum$=(Float#(CALC_val1$)*Float#(CALC_val2$))
Case op$(3);DIV
MAKE_sum$=(Float#(CALC_val1$)/Float#(CALC_val2$))
Case op$(4);ADD
MAKE_sum$=(Float#(CALC_val1$)+Float#(CALC_val2$))
Case op$(5);SUB
MAKE_sum$=(Float#(CALC_val1$)-Float#(CALC_val2$))
End Select
End If
;NUMBEr OUT OF RANGE
If MAKE_sum$="Infinity" Then
error ers$(8)
Else
sum$=MAKE_left$+MAKE_sum$+MAKE_right$
End If
End If
;RESET VALUES
CALC_x=1
CALC_mode=1
CALC_start=False
CALC_type$=""
CALC_val1$=""
CALC_val2$=""
CALC_op$=""
CALC_readtype1$=""
CALC_readtype2$=""
CALC_maketok$=""
CALC_marker=1
;///////////FINISH END/////////////

Else
CALC_maketok$=CALC_maketok$+CALC_getchar$
CALC_x=CALC_x+1
End If
Else
;is not reserved character
If CALC_x>Len(sum$) Then
error ers$(2)
Else
;Check it is a valid character
TEST_found=False
For TEST_array=1 To optotal
If op$(TEST_array)=CALC_getchar$ Then
TEST_found=True
Exit
End If
Next
If TEST_found=True Then
;----------------------
;VALUE found finish off
;----------------------
MAKE_left$=Left$(sum$,CALC_marker-1)
MAKE_right$=Right$(sum$,Len(sum$)-CALC_x+1)
CALC_val2$=CALC_maketok$

If CALC_readtype1$="string" Then
MAKE_sum$=CALC_val1$+CALC_val2$
sum$=MAKE_left$+SPEC_quote$+MAKE_sum$+SPEC_quote$+MAKE_right$
Else
If CALC_readtype1$="value" Then
Select CALC_op$
Case op$(1);POW
MAKE_sum$=(Int(CALC_val1$)^Int(CALC_val2$))
Case op$(2);MUL
MAKE_sum$=(Int(CALC_val1$)*Int(CALC_val2$))
Case op$(3);DIV
MAKE_sum$=(Int(CALC_val1$)/Int(CALC_val2$))
Case op$(4);ADD
MAKE_sum$=(Int(CALC_val1$)+Int(CALC_val2$))
Case op$(5);SUB
MAKE_sum$=(Int(CALC_val1$)-Int(CALC_val2$))
End Select
Else
Select CALC_op$
Case op$(1);POW
MAKE_sum$=(Float#(CALC_val1$)^Float#(CALC_val2$))
Case op$(2);MUL
MAKE_sum$=(Float#(CALC_val1$)*Float#(CALC_val2$))
Case op$(3);DIV
MAKE_sum$=(Float#(CALC_val1$)/Float#(CALC_val2$))
Case op$(4);ADD
MAKE_sum$=(Float#(CALC_val1$)+Float#(CALC_val2$))
Case op$(5);SUB
MAKE_sum$=(Float#(CALC_val1$)-Float#(CALC_val2$))
End Select
End If
;NUMBEr OUT OF RANGE
If MAKE_sum$="Infinity" Then
error ers$(8)
Else
sum$=MAKE_left$+MAKE_sum$+MAKE_right$
End If
End If
;RESET VALUES
CALC_x=1
CALC_mode=1
CALC_start=False
CALC_type$=""
CALC_val1$=""
CALC_val2$=""
CALC_op$=""
CALC_readtype1$=""
CALC_readtype2$=""
CALC_maketok$=""
CALC_marker=1
;///////////FINISH END/////////////
Else
error ers$(4)
End If
End If

End If
End If
End If

End If
End If

Forever
Next
If Left$(sum$,1)=SPEC_quote$ Then
Return Mid$(sum,2,Len(sum$)-2)
Else
Return sum$
End If
End Function

Comments :


hed(Posted 1+ years ago)

 hey skn3[ac],woks perfect!thanks a ton for that! this saved me weeks of work!


Bobysait(Posted 1+ years ago)

 I think there 's an issue ...i wrote :(2*5)+10*(1+3)I get the error :

Code Select Expand

Unexpected ")" At:line 0
I don't understand why it should not run[EDIT]I think it does not support brackets around X*X ...for sure, they are no relevant, but it's not a mistake to put brackets... it's just not needed, so it shoudl not return an error


Streaksy(Posted 1+ years ago)

 (1)+(1)  = crashTwo sets of brackets seems to crash it every time...  Can you fix this?  I love this evaluator... [/i]