# Word creation functions
-F_IMMED = 128
-F_HIDDEN = 256
-F_LENMASK = 127
+F_LENMASK = 31
+F_IMMED = 32
+F_HIDDEN = 64
+NFA_MARK = 128
function createHeader(name::AbstractString, flags::Int64)
mem[mem[H]] = mem[LATEST]
mem[LATEST] = mem[H]
mem[H] += 1
- mem[mem[H]] = length(name) | flags; mem[H] += 1
+ mem[mem[H]] = length(name) | flags | NFA_MARK; mem[H] += 1
putString(name, mem[H]); mem[H] += length(name)
end
F_IMMED_CFA = defConst("F_IMMED", F_IMMED)
F_HIDDEN_CFA = defConst("F_HIDDEN", F_HIDDEN)
F_LENMASK_CFA = defConst("F_LENMASK", F_LENMASK)
+NFA_MARK_CFA = defConst("NFA_MARK", NFA_MARK)
# Basic forth primitives
currentSource() = sources[length(sources)]
EOF = defPrimWord("\x04", () -> begin
- close(pop!(sources))
- if !isempty(sources)
+ if currentSource() != STDIN
+ close(pop!(sources))
return NEXT
else
return 0
return NEXT
end)
+function raw_mode!(mode::Bool)
+ if ccall(:jl_tty_set_mode, Int32, (Ptr{Void}, Int32), STDIN.handle, mode) != 0
+ throw("FATAL: Terminal unable to enter raw mode.")
+ end
+end
+
+function getKey()
+ raw_mode!(true)
+ byte = readbytes(STDIN, 1)[1]
+ raw_mode!(false)
+
+ if byte == 0x0d
+ return 0x0a
+ elseif byte == 127
+ return 0x08
+ else
+ return byte
+ end
+end
+
+KEY = defPrimWord("KEY", () -> begin
+ pushPS(Int(getKey()))
+ return NEXT
+end)
+
+function getLineFromSTDIN()
+ line = ""
+ while true
+ key = Char(getKey())
+
+ if key == '\n'
+ print(" ")
+ return ASCIIString(line)
+
+ elseif key == '\x04'
+ if isempty(line)
+ return string("\x04")
+ end
+
+ elseif key == '\b'
+ if !isempty(line)
+ line = line[1:length(line)-1]
+ print("\b \b")
+ end
+
+ elseif key == '\e'
+ # Strip ANSI escape sequence
+ nextKey = Char(getKey())
+ if nextKey == '['
+ while true
+ nextKey = Char(getKey())
+ if nextKey >= '@' || nextKey <= '~'
+ break
+ end
+ end
+ end
+
+ else
+ print(key)
+ line = string(line, key)
+ end
+ end
+end
+
SPAN, SPAN_CFA = defNewVar("SPAN", 0)
EXPECT = defPrimWord("EXPECT", () -> begin
maxLen = popPS()
addr = popPS()
- if !eof(currentSource())
- line = chomp(readline(currentSource()))
- mem[SPAN] = min(length(line), maxLen)
- putString(line[1:mem[SPAN]], addr)
+ if currentSource() == STDIN
+ line = getLineFromSTDIN()
else
- mem[SPAN] = 1
- mem[addr] = 4 # eof
+ if !eof(currentSource())
+ line = chomp(readline(currentSource()))
+ else
+ line = "\x04" # eof
+ end
end
+ mem[SPAN] = min(length(line), maxLen)
+ putString(line[1:mem[SPAN]], addr)
+
return NEXT
end)
# Dictionary searches
+TOCFA = defPrimWord(">CFA", () -> begin
+
+ addr = popPS()
+ lenAndFlags = mem[addr+1]
+ len = lenAndFlags & F_LENMASK
+
+ pushPS(addr + 2 + len)
+
+ return NEXT
+end)
+
+TOBODY = defWord(">BODY", [INCR, EXIT])
+
FIND = defPrimWord("FIND", () -> begin
countedAddr = popPS()
word = lowercase(getString(wordAddr, wordLen))
latest = LATEST
+ lenAndFlags = 0
i = 0
while (latest = mem[latest]) > 0
end
end
- pushPS(latest)
-
- return NEXT
-end)
-
-TOCFA = defPrimWord(">CFA", () -> begin
-
- addr = popPS()
- lenAndFlags = mem[addr+1]
- len = lenAndFlags & F_LENMASK
-
- pushPS(addr + 2 + len)
+ if latest > 0
+ pushPS(latest)
+ callPrim(mem[TOCFA])
+ if (lenAndFlags & F_IMMED) == F_IMMED
+ pushPS(1)
+ else
+ pushPS(-1)
+ end
+ else
+ pushPS(countedAddr)
+ pushPS(0)
+ end
return NEXT
end)
-TOPFA = defWord(">PFA", [TOCFA, INCR, EXIT])
# Branching
end)
BYE = defPrimWord("BYE", () -> begin
- println("Bye!")
+ println("\nBye!")
return 0
end)
DUP, FETCH, ZE, ZBRANCH, 3,
DROP, EXIT, # Exit if TIB is exhausted
- STATE_CFA, FETCH, ZBRANCH, 31,
+ STATE_CFA, FETCH, ZBRANCH, 24,
# Compiling
- DUP, FIND, QDUP, ZBRANCH, 19,
+ FIND, QDUP, ZBRANCH, 13,
# Found word.
- SWAP, DROP,
- DUP, TOCFA, SWAP, INCR, FETCH, LIT, F_IMMED, AND, ZBRANCH, 4,
+ LIT, -1, EQ, INVERT, ZBRANCH, 4,
+
# Immediate: Execute!
- EXECUTE, BRANCH, -33,
+ EXECUTE, BRANCH, -26,
# Not immediate: Compile!
- COMMA, BRANCH, -36,
+ COMMA, BRANCH, -29,
# No word found, parse number
- NUMBER, BTICK, LIT, COMMA, COMMA, BRANCH, -43,
+ NUMBER, BTICK, LIT, COMMA, COMMA, BRANCH, -36,
# Interpreting
- DUP, FIND, QDUP, ZBRANCH, 7,
+ FIND, QDUP, ZBRANCH, 5,
# Found word. Execute!
- SWAP, DROP, TOCFA, EXECUTE, BRANCH, -54,
+ DROP, EXECUTE, BRANCH, -44,
# No word found, parse number and leave on stack
- NUMBER, BRANCH, -57,
+ NUMBER, BRANCH, -47,
EXIT]
)
# Compilation
+HERE = defWord("HERE",
+ [H_CFA, FETCH, EXIT])
+
HEADER = defPrimWord("HEADER", () -> begin
wordAddr = popPS()+1
wordLen = mem[wordAddr-1]
return NEXT
end)
+CREATE = defWord("CREATE",
+ [LIT, 32, WORD, HEADER,
+ LIT, DOVAR, COMMA,
+ EXIT])
+
+DODOES = defPrim(() -> begin
+ pushRS(reg.IP)
+ reg.IP = popPS()
+ pushPS(reg.W + 1)
+ return NEXT
+end, name="DODOES")
+
+DOES_HELPER = defPrimWord("(DOES>)", () -> begin
+
+ pushPS(mem[LATEST])
+ callPrim(mem[TOCFA])
+ cfa = popPS()
+
+ runtimeAddr = popPS()
+
+ mem[cfa] = defPrim(eval(:(() -> begin
+ pushPS($(runtimeAddr))
+ return DODOES
+ end)), name="doesPrim")
+
+ return NEXT
+end, flags=F_IMMED)
+
+DOES = defWord("DOES>",
+ [BTICK, LIT, COMMA, HERE, LIT, 3, ADD, COMMA,
+ BTICK, DOES_HELPER, COMMA, BTICK, EXIT, COMMA, EXIT],
+ flags=F_IMMED)
+
LBRAC = defPrimWord("[", () -> begin
mem[STATE] = 0
return NEXT
end, flags=F_IMMED)
HIDDEN = defPrimWord("HIDDEN", () -> begin
- addr = popPS() + 1
- mem[addr] = mem[addr] $ F_HIDDEN
+ lenAndFlagsAddr = mem[LATEST] + 1
+ mem[lenAndFlagsAddr] = mem[lenAndFlagsAddr] $ F_HIDDEN
return NEXT
end)
-HIDE = defWord("HIDE",
- [LIT, 32, WORD,
- FIND,
- HIDDEN,
- EXIT])
-
COLON = defWord(":",
[LIT, 32, WORD,
HEADER,
LIT, DOCOL, COMMA,
- LATEST_CFA, FETCH, HIDDEN,
+ HIDDEN,
RBRAC,
EXIT])
SEMICOLON = defWord(";",
[LIT, EXIT, COMMA,
- LATEST_CFA, FETCH, HIDDEN,
+ HIDDEN,
LBRAC,
EXIT], flags=F_IMMED)
count = popPS()
addr = popPS()
+ println()
dump(addr, count=count)
return NEXT
The Lambda Lab / projects / forth.jl.git / blobdiff