primitives = Array{Function,1}()
primNames = Array{ASCIIString,1}()
-# Built-in variables
+# Memory geography and built-in variables
nextVarAddr = 1
H = nextVarAddr; nextVarAddr += 1 # Next free memory address
mem[addr:(addr+length(str)-1)] = [Int64(c) for c in str]
end
+stringAsInts(str::ASCIIString) = [Int(c) for c in collect(str)]
+
# Primitive creation and calling functions
function defPrim(f::Function; name="nameless")
sources = Array{Any,1}()
currentSource() = sources[length(sources)]
+CLOSEFILES_CFA = defPrimWord("CLOSEFILES", () -> begin
+ while currentSource() != STDIN
+ close(pop!(sources))
+ end
+
+ return NEXT
+end)
+
EOF_CFA = defPrimWord("\x04", () -> begin
if currentSource() != STDIN
close(pop!(sources))
elseif key == '\b'
if !isempty(line)
+ if line[length(line)] == '\t'
+ print(string("\r\033[K",line[1:length(line)-1]))
+ else
+ print("\b\033[K")
+ end
+
line = line[1:length(line)-1]
- print("\b \b")
end
elseif key == '\e'
return NEXT
end)
+NUMCONTEXT, NUMCONTEXT_CFA = defNewVar("#CONTEXT", 1)
+
createHeader("FORTH", 0)
FORTH_CFA = mem[H]
dictWrite(defPrim(() -> begin
- mem[CONTEXT] = reg.W
+ mem[CONTEXT + mem[NUMCONTEXT] - 1] = reg.W
return NEXT
end, name="FORTH"))
dictWrite(0) # cell for latest
CONTEXT, CONTEXT_CFA = defNewVar("CONTEXT", zeros(Int64, 10))
mem[CONTEXT] = FORTH_CFA
-NUMCONTEXT, NUMCONTEXT_CFA = defNewVar("#CONTEXT", 1)
-
-FIND_CFA = defPrimWord("FIND", () -> begin
+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]-1)]
-
+ lfa = vocabCFA+1
lenAndFlags = 0
- lfa = 0
-
- for vocabCFA in reverse(context)
- lfa = vocabCFA+1
-
- while (lfa = mem[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
- thisWord = lowercase(getString(lfa+2, len))
+ lenAndFlags = mem[lfa+1]
+ len = lenAndFlags & F_LENMASK
+ hidden = (lenAndFlags & F_HIDDEN) == F_HIDDEN
- if thisWord == word
- break
- end
+ if hidden || len != wordLen
+ continue
end
- if lfa>0
+ thisWord = lowercase(getString(lfa+2, len))
+
+ if thisWord == word
break
end
end
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
EXIT_CFA])
PROMPT_CFA = defPrimWord("PROMPT", () -> begin
- if (mem[STATE] == 0 && currentSource() == STDIN)
- println(" ok")
+ if currentSource() == STDIN
+ if mem[STATE] == 0
+ print(" ok")
+ end
+ println()
end
return NEXT
BRANCH_CFA,-4])
ABORT_CFA = defWord("ABORT",
- [PSP0_CFA, PSPSTORE_CFA, QUIT_CFA])
+ [CLOSEFILES_CFA, PSP0_CFA, PSPSTORE_CFA, QUIT_CFA])
BYE_CFA = defPrimWord("BYE", () -> begin
println("\nBye!")