module forth
+import Base.REPLCompletions, Base.invokelatest
+
# VM mem size
size_mem = 1000000 # 1 mega-int
size_RS = 1000 # Return stack size
size_PS = 1000 # Parameter stack size
size_TIB = 1000 # Terminal input buffer size
+size_FIB = 1000 # File input buffer size
# Memory arrays
mem = Array{Int64,1}(size_mem)
primitives = Array{Function,1}()
-primNames = Array{ASCIIString,1}()
+primNames = Array{AbstractString,1}()
-# Built-in variables
+# Memory geography and built-in variables
nextVarAddr = 1
-H = nextVarAddr; nextVarAddr += 1 # Next free memory address
-FORTH = nextVarAddr; nextVarAddr += 1 # LFA of latest word in system dict
-CURRENT = nextVarAddr; nextVarAddr += 1 # Current compilation dict
+H = nextVarAddr; nextVarAddr += 1 # Next free memory address
+FORTH_LATEST = nextVarAddr; nextVarAddr += 1 # FORTH dict latest
+CURRENT = nextVarAddr; nextVarAddr += 1 # Current compilation dict
RSP0 = nextVarAddr # bottom of RS
PSP0 = RSP0 + size_RS # bottom of PS
TIB = PSP0 + size_PS # address of terminal input buffer
-mem[H] = TIB + size_TIB # location of bottom of dictionary
-mem[FORTH] = 0 # no previous definition
-mem[CURRENT] = FORTH # Compile words to system dict initially
+FIB = TIB + size_TIB # address of terminal input buffer
+mem[H] = FIB + size_FIB # location of bottom of dictionary
+mem[FORTH_LATEST] = 0 # zero FORTH dict latest (no previous def)
+mem[CURRENT] = FORTH_LATEST-1 # Compile words to system dict initially
DICT = mem[H] # Save bottom of dictionary as constant
end
end
+function ensurePSCapacity(toAdd::Int64)
+ if reg.PSP + toAdd >= PSP0 + size_PS
+ error("Parameter stack overflow.")
+ end
+end
+
function ensureRSDepth(depth::Int64)
if reg.RSP - RSP0 < depth
error("Return stack underflow.")
end
end
+function ensureRSCapacity(toAdd::Int64)
+ if reg.RSP + toAdd >= RSP0 + size_RS
+ error("Return stack overflow.")
+ end
+end
+
function pushRS(val::Int64)
+ ensureRSCapacity(1)
mem[reg.RSP+=1] = val
end
end
function pushPS(val::Int64)
+ ensurePSCapacity(1)
+
mem[reg.PSP += 1] = val
end
# Handy functions for adding/retrieving strings to/from memory.
-getString(addr::Int64, len::Int64) = ASCIIString([Char(c) for c in mem[addr:(addr+len-1)]])
+getString(addr::Int64, len::Int64) = String([Char(c) for c in mem[addr:(addr+len-1)]])
-function putString(str::ASCIIString, addr::Int64)
+function putString(str::AbstractString, addr::Int64)
mem[addr:(addr+length(str)-1)] = [Int64(c) for c in str]
end
+function putString(str::AbstractString, addr::Int64, maxLen::Int64)
+ len = min(length(str), maxLen)
+ mem[addr:(addr+len-1)] = [Int64(c) for c in str]
+end
+
+stringAsInts(str::AbstractString) = [Int(c) for c in collect(str)]
+
# Primitive creation and calling functions
function defPrim(f::Function; name="nameless")
if addr >=0 || -addr>length(primitives)
error("Attempted to execute non-existent primitive at address $addr.")
else
- primitives[-addr]()
+ invokelatest(primitives[-addr])
end
end
getPrimName(addr::Int64) = primNames[-addr]
F_HIDDEN = 64
NFA_MARK = 128
+function dictWrite(ints::Array{Int64,1})
+ mem[mem[H]:(mem[H]+length(ints)-1)] = ints
+ mem[H] += length(ints)
+end
+dictWrite(int::Int64) = dictWrite([int])
+dictWriteString(string::AbstractString) = dictWrite([Int64(c) for c in string])
+
function createHeader(name::AbstractString, flags::Int64)
- mem[mem[H]] = mem[mem[CURRENT]]
- mem[mem[CURRENT]] = mem[H]
+ mem[mem[H]] = mem[mem[CURRENT]+1]
+ mem[mem[CURRENT]+1] = mem[H]
mem[H] += 1
- mem[mem[H]] = length(name) | flags | NFA_MARK; mem[H] += 1
- putString(name, mem[H]); mem[H] += length(name)
+ dictWrite(length(name) | flags | NFA_MARK)
+ dictWriteString(name)
end
function defPrimWord(name::AbstractString, f::Function; flags::Int64=0)
createHeader(name, flags)
codeWordAddr = mem[H]
- mem[codeWordAddr] = defPrim(f, name=name)
- mem[H] += 1
+ dictWrite(defPrim(f, name=name))
return codeWordAddr
end
createHeader(name, flags)
addr = mem[H]
- mem[mem[H]] = DOCOL
- mem[H] += 1
+ dictWrite(DOCOL)
- for wordAddr in wordAddrs
- mem[mem[H]] = wordAddr
- mem[H] += 1
- end
+ dictWrite(wordAddrs)
return addr
end
codeWordAddr = mem[H]
varAddr = mem[H] + 1
- mem[mem[H]] = DOVAR; mem[H] += 1
- mem[mem[H]:(mem[H]+length(initial)-1)] = initial; mem[H] += length(initial)
+ dictWrite(DOVAR)
+ dictWrite(initial)
return varAddr, codeWordAddr
end
codeWordAddr = mem[H]
- mem[mem[H]] = DOCON; mem[H] += 1
- mem[mem[H]] = val; mem[H] += 1
+ dictWrite(DOCON)
+ dictWrite(val)
return codeWordAddr
end
# Dictionary entries for core built-in variables, constants
H_CFA = defExistingVar("H", H)
-#LATEST_CFA = defExistingVar("LATEST", LATEST)
PSP0_CFA = defConst("PSP0", PSP0)
RSP0_CFA = defConst("RSP0", RSP0)
XOR_CFA = defPrimWord("XOR", () -> begin
b = popPS()
a = popPS()
- pushPS(a $ b)
+ pushPS(xor(a, b))
return NEXT
end)
# I/O
-sources = Array{Any,1}()
-currentSource() = sources[length(sources)]
+openFiles = Dict{Int64,IOStream}()
+nextFileID = 1
-EOF_CFA = defPrimWord("\x04", () -> begin
- if currentSource() != STDIN
- close(pop!(sources))
+
+## File access modes
+FAM_RO = 0
+FAM_WO = 1
+FAM_RO_CFA = defConst("R/O", FAM_RO)
+FAM_WO_CFA = defConst("W/O", FAM_WO)
+
+function fileOpener(create::Bool)
+ fam = popPS()
+ fnameLen = popPS()
+ fnameAddr = popPS()
+
+ fname = getString(fnameAddr, fnameLen)
+
+ if create && !isfile(fname)
+ pushPS(0)
+ pushPS(-1) # error
return NEXT
+ end
+
+ if (fam == FAM_RO)
+ mode = "r"
else
- return 0
+ mode = "w"
+ end
+
+ global nextFileID
+ openFiles[nextFileID] = open(fname, mode)
+ pushPS(nextFileID)
+ pushPS(0)
+
+ nextFileID += 1
+end
+
+OPEN_FILE_CFA = defPrimWord("OPEN-FILE", () -> begin
+ fileOpener(false)
+ return NEXT
+end);
+
+CREATE_FILE_CFA = defPrimWord("CREATE-FILE", () -> begin
+ fileOpener(true)
+ return NEXT
+end);
+
+CLOSE_FILE_CFA = defPrimWord("CLOSE-FILE", () -> begin
+ fid = popPS()
+ close(openFiles[fid])
+ delete!(openFiles, fid)
+
+ pushPS(0) # Result code 0
+ return NEXT
+end)
+
+CLOSE_FILES_CFA = defPrimWord("CLOSE-FILES", () -> begin
+ for fh in values(openFiles)
+ close(fh)
end
+ empty!(openFiles)
+
+ pushPS(0) # Result code 0
+ return NEXT
+end)
+
+READ_LINE_CFA = defPrimWord("READ-LINE", () -> begin
+ fid = popPS()
+ maxSize = popPS()
+ addr = popPS()
+
+ fh = openFiles[fid]
+ line = readline(fh, chomp=false)
+
+ eofFlag = endswith(line, '\n') ? 0 : -1
+ line = chomp(line)
+
+ putString(line, addr, maxSize)
+
+ pushPS(length(line))
+ pushPS(eofFlag)
+ pushPS(0)
+
+ return NEXT
+end)
+
+READ_FILE_CFA = defPrimWord("READ-FILE", () -> begin
+ fid = popPS()
+ size = popPS()
+ addr = popPS()
+
+ fh = openFiles[fid]
+
+ string = join(map(x -> Char(x), read(fh, size)), "")
+
+ eofFlag = length(string) == size ? 0 : -1 ;
+
+ putString(string, addr, length(string))
+
+ pushPS(length(string))
+ pushPS(eofFlag)
+
+ return NEXT
end)
+
EMIT_CFA = defPrimWord("EMIT", () -> begin
print(Char(popPS()))
return NEXT
function getKey()
raw_mode!(true)
- byte = readbytes(STDIN, 1)[1]
+ byte = read(STDIN, 1)[1]
raw_mode!(false)
if byte == 0x0d
end)
function getLineFromSTDIN()
+
+ function getFrag(s)
+ chars = collect(s)
+ slashIdx = findlast(chars, '\\')
+
+ if slashIdx > 0
+ return join(chars[slashIdx:length(chars)])
+ else
+ return nothing
+ end
+ end
+
+ function backspaceStr(s, bsCount)
+ oldLen = length(s)
+ newLen = max(0, oldLen - bsCount)
+ return join(collect(s)[1:newLen])
+ end
+
line = ""
while true
key = Char(getKey())
if key == '\n'
print(" ")
- return ASCIIString(line)
+ return String(line)
elseif key == '\x04'
if isempty(line)
elseif key == '\b'
if !isempty(line)
- line = line[1:length(line)-1]
- print("\b \b")
+ print("\b\033[K")
+ line = backspaceStr(line, 1)
end
elseif key == '\e'
end
end
+ elseif key == '\t'
+ # Currently do nothing
+
+ frag = getFrag(line)
+ if frag != nothing
+ if haskey(REPLCompletions.latex_symbols, frag)
+ print(repeat("\b", length(frag)))
+ print("\033[K")
+ comp = REPLCompletions.latex_symbols[frag]
+ line = string(backspaceStr(line, length(frag)), comp)
+ print(comp)
+ end
+ end
+
else
print(key)
line = string(line, key)
maxLen = popPS()
addr = popPS()
- if currentSource() == STDIN
- line = getLineFromSTDIN()
- else
- if !eof(currentSource())
- line = chomp(readline(currentSource()))
- else
- line = "\x04" # eof
- end
- end
+ line = getLineFromSTDIN()
mem[SPAN] = min(length(line), maxLen)
- putString(line[1:mem[SPAN]], addr)
+ putString(line, addr, maxLen)
return NEXT
end)
# Dictionary searches
-LFATOCFA_CFA = defPrimWord("LFA>CFA", () -> begin
+FROMLINK_CFA = defPrimWord("LINK>", () -> begin
addr = popPS()
lenAndFlags = mem[addr+1]
return NEXT
end)
-TOBODY_CFA = defWord(">BODY", [INCR_CFA, EXIT_CFA])
-
-FORTH_CFA = defExistingVar("FORTH", FORTH)
-CONTEXT, CONTEXT_CFA = defNewVar("CONTEXT", zeros(Int64, 100))
-mem[CONTEXT] = FORTH_CFA
NUMCONTEXT, NUMCONTEXT_CFA = defNewVar("#CONTEXT", 1)
-FIND_CFA = defPrimWord("FIND", () -> begin
+createHeader("FORTH", 0)
+FORTH_CFA = mem[H]
+dictWrite(defPrim(() -> begin
+ mem[CONTEXT + mem[NUMCONTEXT] - 1] = reg.W
+ return NEXT
+end, name="FORTH"))
+dictWrite(0) # cell for latest
+
+CURRENT_CFA = defExistingVar("CURRENT", CURRENT)
+
+# Switch to new FORTH vocabulary cfa
+mem[FORTH_CFA+1] = mem[mem[CURRENT]+1]
+mem[CURRENT] = FORTH_CFA
+CONTEXT, CONTEXT_CFA = defNewVar("CONTEXT", zeros(Int64, 10))
+mem[CONTEXT] = FORTH_CFA
+
+FINDVOCAB_CFA = defPrimWord("FINDVOCAB", () -> begin
+ vocabCFA = popPS()
countedAddr = popPS()
+
wordAddr = countedAddr + 1
wordLen = mem[countedAddr]
word = lowercase(getString(wordAddr, wordLen))
- context = mem[CONTEXT:(CONTEXT+mem[NUMCONTEXT])]
-
+ lfa = vocabCFA+1
lenAndFlags = 0
- lfa = 0
-
- for vocabCFA in reverse(context)
- callPrim(mem[vocabCFA])
- lfa = popPS()
-
- while lfa > 0
- lenAndFlags = mem[lfa+1]
- len = lenAndFlags & F_LENMASK
- hidden = (lenAndFlags & F_HIDDEN) == F_HIDDEN
- if hidden || len != wordLen
- continue
- end
+ while (lfa = mem[lfa]) > 0
- thisAddr = latest+2
- thisWord = lowercase(getString(thisAddr, len))
-
- if lowercase(thisWord) == lowercase(word)
- break
- end
+ lenAndFlags = mem[lfa+1]
+ len = lenAndFlags & F_LENMASK
+ hidden = (lenAndFlags & F_HIDDEN) == F_HIDDEN
- lfa = mem[lfa]
+ if hidden || len != wordLen
+ continue
end
- if lfa>0
+ thisWord = lowercase(getString(lfa+2, len))
+
+ if thisWord == word
break
end
end
if lfa > 0
pushPS(lfa)
- callPrim(mem[LFATOCFA_CFA])
+ callPrim(mem[FROMLINK_CFA])
if (lenAndFlags & F_IMMED) == F_IMMED
pushPS(1)
else
return NEXT
end)
+FIND_CFA = defPrimWord("FIND", () -> begin
+
+ countedAddr = popPS()
+ context = mem[CONTEXT:(CONTEXT+mem[NUMCONTEXT]-1)]
+
+ for vocabCFA in reverse(context)
+ pushPS(countedAddr)
+ pushPS(vocabCFA)
+ callPrim(mem[FINDVOCAB_CFA])
+
+ callPrim(mem[DUP_CFA])
+ if popPS() != 0
+ return NEXT
+ else
+ popPS()
+ popPS()
+ end
+ end
+
+ pushPS(countedAddr)
+ pushPS(0)
+
+ return NEXT
+end)
+
# Branching
TIB_CFA = defConst("TIB", TIB)
NUMTIB, NUMTIB_CFA = defNewVar("#TIB", 0)
+
+FIB_CFA = defConst("FIB", FIB)
+NUMFIB, NUMFIB_CFA = defNewVar("#FIB", 0)
+
+IB_CFA = defPrimWord("IB", () -> begin
+ pushPS(mem[SOURCE_ID_VAR] == 0 ? TIB : FIB)
+ return NEXT
+end)
+
+NUMIB_CFA = defPrimWord("#IB", () -> begin
+ pushPS(mem[SOURCE_ID_VAR] == 0 ? NUMTIB : NUMFIB)
+ return NEXT
+end)
+
TOIN, TOIN_CFA = defNewVar(">IN", 0)
+SOURCE_ID_VAR, SOURCE_ID_VAR_CFA = defNewVar("SOURCE-ID-VAR", 0)
+
QUERY_CFA = defWord("QUERY",
[TIB_CFA, LIT_CFA, 160, EXPECT_CFA,
SPAN_CFA, FETCH_CFA, NUMTIB_CFA, STORE_CFA,
LIT_CFA, 0, TOIN_CFA, STORE_CFA,
EXIT_CFA])
+EOF_FLAG, EOF_FLAG_CFA = defNewVar("EOF-FLAG", 0)
+
+# ( fid -- )
+# EOF-FLAG set to true if EOF is reached
+QUERY_FILE_CFA = defWord("QUERY-FILE",
+ [FIB_CFA, LIT_CFA, 160, ROT_CFA, READ_LINE_CFA,
+ DROP_CFA, EOF_FLAG_CFA, STORE_CFA,
+ NUMFIB_CFA, STORE_CFA,
+ LIT_CFA, 0, TOIN_CFA, STORE_CFA,
+ EXIT_CFA])
+
WORD_CFA = defPrimWord("WORD", () -> begin
delim = popPS()
+ if mem[SOURCE_ID_VAR] == 0
+ bufferAddr = TIB
+ sizeAddr = NUMTIB
+ else
+ bufferAddr = FIB
+ sizeAddr = NUMFIB
+ end
+
# Chew up initial occurrences of delim
- while (mem[TOIN]<mem[NUMTIB] && mem[TIB+mem[TOIN]] == delim)
+ while (mem[TOIN]<mem[sizeAddr] && mem[bufferAddr+mem[TOIN]] == delim)
mem[TOIN] += 1
end
# Start reading in word
count = 0
- while (mem[TOIN]<mem[NUMTIB])
- mem[addr] = mem[TIB+mem[TOIN]]
+ while (mem[TOIN]<mem[sizeAddr])
+ mem[addr] = mem[bufferAddr+mem[TOIN]]
mem[TOIN] += 1
if (mem[addr] == delim)
mem[countAddr] = count
pushPS(countAddr)
+ #println("Processing word: '$(getString(countAddr+1,mem[countAddr]))' (state $(mem[STATE]))")
+
return NEXT
end)
DOES_HELPER_CFA = defPrimWord("(DOES>)", () -> begin
- pushPS(mem[mem[CURRENT]])
- callPrim(mem[LFATOCFA_CFA])
+ pushPS(mem[mem[CURRENT]+1])
+ callPrim(mem[FROMLINK_CFA])
cfa = popPS()
runtimeAddr = popPS()
end)), name="doesPrim")
return NEXT
-end, flags=F_IMMED)
+end, flags=F_IMMED | F_HIDDEN)
DOES_CFA = defWord("DOES>",
[LIT_CFA, LIT_CFA, COMMA_CFA, HERE_CFA, LIT_CFA, 3, ADD_CFA, COMMA_CFA,
end, flags=F_IMMED)
HIDDEN_CFA = defPrimWord("HIDDEN", () -> begin
- lenAndFlagsAddr = mem[mem[CURRENT]] + 1
- mem[lenAndFlagsAddr] = mem[lenAndFlagsAddr] $ F_HIDDEN
+ lenAndFlagsAddr = mem[mem[CURRENT]+1] + 1
+ mem[lenAndFlagsAddr] = xor(mem[lenAndFlagsAddr], F_HIDDEN)
return NEXT
end)
EXIT_CFA], flags=F_IMMED)
IMMEDIATE_CFA = defPrimWord("IMMEDIATE", () -> begin
- lenAndFlagsAddr = mem[mem[CURRENT]] + 1
- mem[lenAndFlagsAddr] = mem[lenAndFlagsAddr] $ F_IMMED
+ lenAndFlagsAddr = mem[mem[CURRENT]+1] + 1
+ mem[lenAndFlagsAddr] = xor(mem[lenAndFlagsAddr], F_IMMED)
return NEXT
end, flags=F_IMMED)
+# ( addr n -- primAddr )
+CREATE_PRIM_CFA = defPrimWord("CREATE-PRIM", () -> begin
+ len = popPS()
+ addr = popPS()
+
+ exprString = string("() -> begin\n",
+ getString(addr, len), "\n",
+ "return NEXT\n",
+ "end")
+ func = eval(parse(exprString))
+
+ pushPS(defPrim(func))
+ return NEXT
+end)
+
# Outer Interpreter
EXECUTE_CFA = defPrimWord("EXECUTE", () -> begin
[LIT_CFA, 32, WORD_CFA, # Read next space-delimited word
DUP_CFA, FETCH_CFA, ZE_CFA, ZBRANCH_CFA, 3,
- DROP_CFA, EXIT_CFA, # Exit if TIB is exhausted
+ DROP_CFA, EXIT_CFA, # Exit if input buffer is exhausted
STATE_CFA, FETCH_CFA, ZBRANCH_CFA, 24,
# Compiling
EXIT_CFA])
PROMPT_CFA = defPrimWord("PROMPT", () -> begin
- if (mem[STATE] == 0 && currentSource() == STDIN)
- println(" ok")
+ if mem[STATE] == 0
+ print(" ok")
end
+ println()
return NEXT
end)
QUIT_CFA = defWord("QUIT",
- [LIT_CFA, 0, STATE_CFA, STORE_CFA,
- LIT_CFA, 0, NUMTIB_CFA, STORE_CFA,
- RSP0_CFA, RSPSTORE_CFA,
- QUERY_CFA,
- INTERPRET_CFA, PROMPT_CFA,
- BRANCH_CFA,-4])
+ [LIT_CFA, 0, STATE_CFA, STORE_CFA, # Set mode to interpret
+ LIT_CFA, 0, SOURCE_ID_VAR_CFA, STORE_CFA, # Set terminal as input stream
+ LIT_CFA, 0, NUMTIB_CFA, STORE_CFA, # Clear the input buffer
+ RSP0_CFA, RSPSTORE_CFA, # Clear the return stack
+ QUERY_CFA, # Read line of input
+ INTERPRET_CFA, PROMPT_CFA, # Interpret line
+ BRANCH_CFA,-4]) # Loop
+
+INCLUDED_CFA = defWord("INCLUDED",
+ [LIT_CFA, 0, STATE_CFA, STORE_CFA, # Set mode to interpret
+ FAM_RO_CFA, OPEN_FILE_CFA, DROP_CFA, # Open the file
+ SOURCE_ID_VAR_CFA, FETCH_CFA, SWAP_CFA, # Store current source on stack
+ SOURCE_ID_VAR_CFA, STORE_CFA, # Mark this as the current source
+ SOURCE_ID_VAR_CFA, FETCH_CFA, QUERY_FILE_CFA, # Read line from file
+ EOF_FLAG_CFA, FETCH_CFA,
+ NUMFIB_CFA, FETCH_CFA, ZE_CFA, AND_CFA, # Test for EOF and empty line
+ INVERT_CFA, ZBRANCH_CFA, 4, # Break out if EOF
+ INTERPRET_CFA, # Interpret line
+ BRANCH_CFA, -14, # Loop
+ SOURCE_ID_VAR_CFA, FETCH_CFA,
+ CLOSE_FILE_CFA, DROP_CFA, # Close file
+ SOURCE_ID_VAR_CFA, STORE_CFA, # Restore input source
+ LIT_CFA, 0, NUMIB_CFA, STORE_CFA, # Zero #IB
+ LIT_CFA, 0, TOIN_CFA, STORE_CFA, # Zero >IN
+ EXIT_CFA])
+
+INCLUDE_CFA = defWord("INCLUDE", [LIT_CFA, 32, WORD_CFA,
+ DUP_CFA, INCR_CFA,
+ SWAP_CFA, FETCH_CFA,
+ INCLUDED_CFA, EXIT_CFA]);
ABORT_CFA = defWord("ABORT",
- [PSP0_CFA, PSPSTORE_CFA, QUIT_CFA])
+ [CLOSE_FILES_CFA, DROP_CFA, PSP0_CFA, PSPSTORE_CFA, QUIT_CFA])
BYE_CFA = defPrimWord("BYE", () -> begin
- println("\nBye!")
+ if mem[SOURCE_ID_VAR] == 0
+ println("\nBye!")
+ end
return 0
end)
-# File I/O
+EOF_CFA = defPrimWord("\x04", () -> begin
+ return 0
+end)
-INCLUDE_CFA = defPrimWord("INCLUDE", () -> begin
- pushPS(32)
- callPrim(mem[WORD_CFA])
- wordAddr = popPS()+1
- wordLen = mem[wordAddr-1]
- word = getString(wordAddr, wordLen)
+### Library loading ###
- fname = word
- if !isfile(fname)
- fname = Pkg.dir("forth","src",word)
- if !isfile(fname)
- error("No file named $word found in current directory or package source directory.")
- end
+oldCWD = ""
+SETLIBCWD_CFA = defPrimWord("SETLIBCWD", () -> begin
+ global oldCWD = pwd()
+ if !isfile("lib.4th") # Exception for debugging.
+ cd(Pkg.dir("forth","src"))
end
- push!(sources, open(fname, "r"))
-
- # Clear input buffer
- mem[NUMTIB] = 0
+ return NEXT
+end)
+RESTORECWD_CFA = defPrimWord("RESTORECWD", () -> begin
+ cd(oldCWD)
return NEXT
end)
+INCLUDED_LIB_CFA = defWord("INCLUDED-LIB",
+ [SETLIBCWD_CFA, INCLUDED_CFA, RESTORECWD_CFA, EXIT_CFA])
+
+INCLUDE_LIB_CFA = defWord("INCLUDE-LIB", [LIT_CFA, 32, WORD_CFA,
+ DUP_CFA, INCR_CFA,
+ SWAP_CFA, FETCH_CFA,
+ INCLUDED_LIB_CFA, EXIT_CFA]);
+
+SKIP_WELCOME, SKIP_WELCOME_CFA = defNewVar("SKIP-WELCOME", 0)
#### VM loop ####
initialized = false
-initFileName = nothing
-if isfile("lib.4th")
- initFileName = "lib.4th"
-elseif isfile(Pkg.dir("forth","src", "lib.4th"))
- initFileName = Pkg.dir("forth","src","lib.4th")
-end
+libFileName = "lib.4th"
-function run(;initialize=true)
- # Begin with STDIN as source
- push!(sources, STDIN)
+function run(fileName=nothing; initialize=true)
+
+ # Start with IP pointing to first instruction of outer interpreter
+ pushRS(QUIT_CFA+1)
- global initialized, initFileName
+ # Include optional file
+ if fileName != nothing
+ putString(fileName, mem[H])
+ pushPS(mem[H])
+ mem[H] += length(fileName)
+ pushPS(length(fileName))
+ pushRS(INCLUDED_CFA+1)
+
+ mem[SKIP_WELCOME] = -1
+ end
+
+ # Load library files
+ global initialized, libFileName
if !initialized && initialize
- if initFileName != nothing
- print("Including definitions from $initFileName...")
- push!(sources, open(initFileName, "r"))
+ if libFileName != nothing
+ #print("Including definitions from $libFileName...")
+
+ putString(libFileName, mem[H])
+ pushPS(mem[H])
+ pushPS(length(libFileName))
+ pushRS(INCLUDED_LIB_CFA+1)
+
initialized = true
else
println("No library file found. Only primitive words available.")
end
end
- # Start with IP pointing to first instruction of outer interpreter
- reg.IP = QUIT_CFA + 1
# Primitive processing loop.
# Everyting else is simply a consequence of this loop!
- jmp = NEXT
+ jmp = mem[EXIT_CFA]
while jmp != 0
try
- #println("Entering prim $(getPrimName(jmp))")
+ #print("Entering prim $(getPrimName(jmp)), PS: ")
+ #printPS()
+
jmp = callPrim(jmp)
catch ex
showerror(STDOUT, ex)
println()
- while !isempty(sources) && currentSource() != STDIN
- close(pop!(sources))
- end
-
# QUIT
reg.IP = ABORT_CFA + 1
jmp = NEXT
i += 1
end
- println("\t", ASCIIString(chars))
+ println("\t", String(chars))
end
end
The Lambda Lab / projects / forth.jl.git / blobdiff