This is a pretty bloated Forth interpreter that supports also loops and various data types.
The original code is from: http:https://linuxenvy.com/bprentice/JForth/
Sorry, there's no documentation. In order to see how things work, please take a look at the test cases in ForthTestCases.java
Have fun.
As of JForth, Build: 2734, Input can be typed using the following notations:
Long
Ex: 1234
0xffd2 ( hex input)
0b1100101 ( binary input)
01:00:00 ( equals 3600, timer value hh:mm:ss)
12M (equals to 12000000, aka 12 Million)
4K (equals to 4000, aka 4 Thousand)
Double
Ex: 123.456
BigInt
Ex: 123456789012345678901234567890L
DoubleSequence
Ex: {1,2,4.456,7}
BigSequence
Ex: {1L,2L,4L.456L,7L}
DoubeMatrix
Ex: {{1,2,4}{5,8,9}}
StringSequence
Ex: {a,b,hello,666}
FracSequence
Ex: {1/2,22,7}
MixedSequence
Ex: {"hello";{1,2,3};0.123;7;3x-8} note the ';' as delimiter.
PolynomialFunction
Ex: 2x^3-x^2+7x-9
Complex
12+6i
Fraction
3/4
String
"hello"
or hello (without quotes) if not defined as forthword)
Comment (not a real data type)
( a comment: open bracket, space, text, close bracket)
( another comment: open bracket, space, text, space, close bracket )
\ comment out everything until line end
JFORTH> wordsd . ! -- Store value into variable or array ' -- Push word from dictionary onto stack ( -- Begin comment * -- Multiply TOS and TOS-1 + -- Add 2 values on stack +! -- Add value to variable +LOOP -- adds value to loop counter i - -- Substract values . -- Pop TOS and print it ." -- String output .S -- Show whole data stack .V -- Show whole variable stack / -- Divide TOS-1 by TOS /MOD -- Dividend and Remainder 0< -- Gives 1 if TOS smaller than 0 0= -- Gives 1 if TOS is zero 0> -- Gives 1 if TOS greater than zero 1+ -- Add 1 to TOS 1- -- Substract 1 from TOS 1/ -- calculate inverse 2* -- Multiply TOS by 2 2+ -- Add 2 to TOS 2- -- Substract 2 from TOS 2/ -- Divide TOS by 2 2DUP -- Duplicate upper 2 elements 2OVER -- Copy TOS-2 & TOS-3 to TOS & TOS-1 2ROT -- Rotates first 3 pairs of elements 2SWAP -- Swaps first 2 pairs of elements : -- Begin word definition ; -- End word definition < -- gives 1 of TOS-1 smaller than TOS <. -- Restore last stack object << -- Rotate left <> -- 1 if TOS is not equal to TOS-1 = -- 1 if TOS is equal to TOS-1 > -- 1 if TOS-1 is bigger than TOS >> -- Rotate right >R -- Put TOS to variable stack ? -- immediately print variable content ?DUP -- Duplicate TOS if not zero @ -- Put variable value on stack ABS -- Absolute value ACCEPT -- Read string from keyboard ACOS -- Inverse cosine AGAIN -- Go back to BEGIN (infinite loop) ALTSUM -- Add all elements together but alternates sign AND -- Binary and of 2 values APPLY -- Apply polynomial to sequence ARAB -- make arab number from roman ARRAY -- Create array ASIN -- Inverse sine ASK -- Show yes/no box ASYNCMSG -- Show asynchronous message box ATAN -- Inverse tangent ATAN2 -- Second arctan, see: https://de.wikipedia.org/wiki/Arctan2 B64 -- make Base64 from String BEEP -- play single tone BEGIN -- Marks the start of an indefinite loop. BF -- execute brainfuck code BIG -- BigPrint BIN -- Set number base to 2 BINOMIAL -- n choose k BINSTR -- Make binary String BKG -- set background color BLOBNAME -- puts blob's path name on stack BREAK -- Breaks out of the forth word BYE -- End the Forth interpreter C -- Speed of light in m/s CGROUP -- Make cyclic group from generator and mod value CLEAR -- Clear the stack CLLTZ -- Get collatz sequence CLOSEBYTEREADER -- Close file CLOSEREADER -- Close file CLOSEWRITER -- Close file CLS -- clear screen COLLECT -- collects all numbers or strings from stack into sequence COMPLEX -- Create a complex from 2 numbers CONJ -- Conjugate of complex or MyFraction CONSTANT -- create new Constant COS -- Cosine COSH -- Cosinus hyperbolicus CR -- Emit carriage return CROSSP -- Cross product of 3D vectors CTAB -- Makes multiplicative group Cayley table matrix of order n DEC -- Set number base to 10 DEPTH -- number of elements currently on the stack DETM -- Determinant of a Matrix DIAGM -- Create diagonal Matrix from List DIR -- Get directory DO -- Sets up a finite loop, given index and limit. DOTP -- Dot product of 3D vectors DROP -- remove TOS DTMF -- create DTMF sound DUP -- Duplicate TOS E -- Natural logarithm base EDITOR -- Enter line editor ELSE EMIT -- Emit single char to console ERR -- Put last error message onto stack EXECUTE -- executes word from stack EXP -- E^x F'= -- Derive a polynomial F2= -- evaluate term with 2 arguments F2L -- frequency to wave length & vice versa F= -- evaluate term FACT -- Factorial FACTOR -- Prime factorisation FALSE -- Gives 0 FIB -- Fibonacci number FITPOLY -- Make polynomial sequence of Points FLUSH -- pops and shows whole stack FONT -- set font FORGET -- Delete word from dictionary FORTH -- execute forth line asynchronously FRACTRAN -- Run Fractran language FREE -- Get anount of free heap mmeory GAMMA -- Gamma funcction GAUSSIAN -- Gaussian random number GBOX -- (Graphics) draw box GCD -- Greates common divisor GCIRCLE -- (Graphics) draw circle GCLEAR -- (Graphics) clear canvas GCOLOR -- (Graphics) set drawing color GDISC -- (Graphics) draw disc GDRAWTO -- (Graphics) draw line from prev x/y to new x/y GETBLOB -- read blob into memory GF* -- Galois multiplication of TOS and TOS-1 GF+ -- Galois addition TOS-1 + TOS GF- -- Galois subtraction TOS-1 - TOS GF/ -- Galois division TOS-1 by TOS GLINE -- (Graphics) draw line GMEAN -- Geometric mean GOUT -- (Graphics) put canvas onto stack GPLOT -- (Graphics) plot x/y GRAY -- make gray code GRECT -- (Graphics) draw rectangle GSTAMP -- (Graphics) draw image to canvas HASH -- generate hash string HEX -- Set number base to 16 HEXSTR -- Make hex string HTTP -- run web server HUMBIN -- Shows large byte amaounts human readable based on 1024 HUMSI -- Shows large byte amounts human readable based on 1000 I -- put loop variable i on stack IDM -- Create Identity Matrix IF IGROUP -- calculate inverses of a group IMGSCALE -- set Image Scale INTERSECT -- Make intersection of 2 sequences INVM -- Inverse of a Matrix IROT -- Rotate image by 90 degrees ISPRIME -- Primality test ISWAP -- mirrors an image J -- put loop variable j on stack JAVA -- compile and run java class JS -- evaluate js expression string JSON -- Convert to JSON JSON2 -- Convert to JSON KEY -- Get key from keyboard LAGPOLY -- Make lagrange polynomial sequence of Points LCM -- Least common multiple LEAVE -- Terminate the loop immediately LENGTH -- Get length of what is on the stack LFONTS -- Show all system fonts LIST -- Put program in editor on stack LN -- Natural logarithm LOADIMG -- load Image from Disk LOG10 -- Logarithm to base 10 LOOP -- repeat loop LPICK -- Get one Element from sequence LSCLR -- Remove all rules LSGET -- get LSystem result LSINFO -- Get complete LSystem as String LSPUT -- Set Matrial for LSystem LSREP -- run LSystem on previous result LSRULE -- Set Rule for LSystem LSWAP -- swap 2 list or string members LUPM -- l/u decomposition of a Matrix M+ -- put any obj into global array M- -- get obj from global array MAX -- Biggest value MCLR -- empties the global array MEAN -- Mean value of sequence MIN -- Smallest value MIX -- Mix two Lists MKBLOB -- make blob from String MLIST -- list elements of global array MLOAD -- load global array from file MOD -- Division remainder MORSE -- play Morse code MORSETXT -- translate to Morse alphabet MSAVE -- save global array to file MSG -- Show message box MYFRACTION -- Create a MyFraction from 2 Numbers NAMEBLOB -- rename existing blob NIP -- same as swap+drop NOT -- Gives 0 if TOS is not 0, otherwise 1 OPENBYTEREADER -- Open file for reading OPENREADER -- Open file OPENWRITER -- Open file for Writing OR -- Binary or of 2 values OVER -- Copy TOS-1 to TOS PDIFF -- calculate percentual difference PERCENT -- calculate x percent of y PERMUTE -- Generate permutation PHI -- Phi of complex number PI -- Circle constant PI PICK -- Get value from arbitrary Positon and place it on TOS PING -- Check a host PLAYWAV -- play Wave file PLOT -- Plot x/y data POW -- Exponentation PROD -- Product of all values PSP -- Push space on stack PUTBLOB -- write blob to disk PWD -- get working directory QMEAN -- Quadratic Mean of sequence QR -- Print QR code R> -- Move variable to data stack R@ -- Copy variable to data stack RANDOM -- Pseudo random number READBYTE -- Read byte from file READLINE -- Read line from file RECURSE -- Re-run current word RECURSIVE -- Re-run current word REPLACE -- regex transform a string REV -- Reverse a sequence REVS -- reverse whole stack ROLL -- Remove nth element and put it on TOS ROMAN -- make roman number from integer ROT -- Rotate first 3 elements on stack ROUND -- Rounding double value RUN -- Runs program in editor RUNFILE -- run program file SAM -- speak with SAM voice SAVEIMG -- save Image to Disk SAY -- speak a string SBEEP -- put single tone on stack SCAT -- desintegrate sequence onto stack SEQ -- generate sequence SETBASE -- Set a new number base SF= -- Antiderive of a polynomial SHUFFLE -- Random shuffle a sequence SIN -- Sine SINH -- Sinus hyperbolicus SLEEP -- Sleep some milliseconds SOON -- run deferred word SORT -- Sort a Sequence SP -- Emit single space SPACES -- Emit multiple spaces SPLIT -- Split object into partitions SQRT -- Square root SQU -- Calculate a*a STDDEV -- Standard Deviation of sequence STOPWAV -- stop playing wave clip SUBSEQ -- Subsequence of string or list SUM -- Add all elements together SUMQ -- Make sum of squares SWAP -- Swap TOS and TOS-1 TAN -- Tangent TANH -- Tangent hyperbolicus THEN TIME -- Get time TOBIG -- Make BigInt values of what is on the stack TOBITS -- Make bit sequence from number TOCHAR -- make character from numeric value TOCOMPLEX -- convert to Complex TODLIST -- Create List of digits TODOUBLE -- Make double value of what is on the stack TOFRACTION -- Make Fraction from value on the stack TOLONG -- Make long values of what is on the stack TOM -- Make Matrix from Sequences TONUMLIST -- Make number list of what is on the stack TOPOLY -- Make polynomial from doubleSequence TOSLIST -- Create String List from Double List TOSTR -- Make string of TOS TOTIME -- make HH:MM:SS from TOS TRANSM -- Transpose a Matrix TRUE -- Gives 1 TUCK -- Copy TOS to TOS-2 TUNE -- create music TYPE -- Get type of TOS as string UDPGET -- Receive udp packet UDPPUT -- Send udp packet UNB64 -- make String from Base64 UNGRAY -- reverse gray code UNHEXSTR -- Make Hexstr to Bytes UNHTTP -- stop web server UNIQUE -- Only keep unique elements of sequence UNLINK -- Delete file UNTIL -- If false, go back to BEGIN. If true, terminate the loop UPTIME -- Get uptime URLDEC -- Decode URL encoded string URLENC -- URL encode a string VAR -- Variance of sequence VARIABLE -- Create new variable VER -- Get version information WDAT -- put window position data onto stack WFULL -- set window to fullscreen WHAT -- Show description about a word WHATPERC -- calculate x is what percent of y WORDS -- Show all words WORDSD -- Show words and description WPIN -- pin window to top WPOS -- set console position WRITEBYTE -- Write byte into file WRITEEOL -- Write string end into file WRITESTRING -- Write string to file WSHOW -- show or hide the console WSIZE -- set console size XOR -- Xors two values ZETA -- Riemann Zeta function
You need 2 sequences of same size on the stack. One for the x and another for the y coordinates. Both together give a list of points that can be plotted using the 'plot' command.
Here's an example:
0 1024 0.01 seq dup cos(x)+sin(2*x) swap f= swap plot .
The first part '0 1024 0.01 seq' generates a squence of 1024 values starting at 0 and growing with a step size of 0.01. These are the x-parts of the points to be plotted.
the following 'dup' saves it for later use. Next we apply a function to every value to complete our points. This is done by 'cos(x)+sin(2*x) swap f='
Now we have two sequences on the stack representing 1024 points. A 'swap' puts them into right order and 'plot .' create and show the graphic.
This is how it looks:
This Forth has an internal 1024 * 1024 canvas where you can draw on.
GBOX -- (Graphics) draw box GCIRCLE -- (Graphics) draw circle GCLEAR -- (Graphics) clear canvas GCOLOR -- (Graphics) set drawing color GDISC -- (Graphics) draw disc GDRAWTO -- (Graphics) draw line from prev x/y to new x/y GLINE -- (Graphics) draw line GOUT -- (Graphics) put canvas onto stack GPLOT -- (Graphics) plot x/y GRECT -- (Graphics) draw rectangle GSTAMP -- (Graphics) draw image to canvas
{100,200,30,70} GBOX
Draws a solid box at 100/200, width=30, height=70 using the current drawing color.
{100,200,30,70} GCIRCLE
Draw an elipse at 100/200, width=30, height=70 using the current drawing color.
{100,200,30} GCOLOR
Set current drawing color to RGB=100/200/30
{100,200,30} GCLEAR
Overwrite the canvas with a specific color (Here R=100, G=200, B=30)
{100,200,30,70} GDISC
Draw a solid disc at 100/200, width=30, height=70 using the current drawing color.
{100,200} GDRAWTO
Draw a line from the last plot point to 100/200
GOUT
Put the Canvas on stack (so it can be viewed by using the dot)
{100,200} GPLOT
Plot a point at 100/200 using the current drawing color
{100,200,30,70} GRECT
Draw a rectangle at 100/200, width=30, height=70 using the current drawing color.
{100,200,30,70} GSTAMP
Draw another image (which must be on the stack) at position 100/200 and resize it to width/height=30/70
JForth can be used with a web browser as shell. First start the internal web server:
80 http
Then open a browser on localhost:80. You'll see a black web page with a blue headline containing an input box, where you can type Forth commands. On hitting the enter key, the commands are sent to JForth for execution. The result is sent back to the browser and appears in the black area. Also images wil be shown, for example:
HelloWorld qr .
... will result in an QR code shown in the black area.
DTMF and Morse tones can also be played in the browser