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pgets0.ew
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pgets0.ew
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--
-- pgets0.ew
--
-- Alternative hll implementation of gets(0), aka console string input.
-- **NB** does not work with console redirection.
-- Used in the compiler by processCommandLine() in p.exw and is planned
-- to be used by pdebug.e, when I get round to it.
-- Usage: r = gets0(r_keyHander, default_result).
-- See additional notes in function gets0() below (especially the list
-- of benefits to using it in processCommandLine).
--
--!!/**/with console
--with trace
constant STD_INPUT_HANDLE = -10,
--/*
STD_OUTPUT_HANDLE = -11,
--*/
ENABLE_PROCESSED_INPUT = 1,
-- C_PTR = C_POINTER,
KEY_EVENT = 1
--/* not rqd for Phix:
include builtins\dll.e
include builtins\machine.e
atom xWriteConsole, stdout, backspace3, bytes_count
--*/
object void
atom kernel32, xAllocConsole, xGetStdHandle, xSetConsoleMode, xReadConsoleInput,
lpBuffer,
lpEventsRead, stdin
constant lpEventType = 0, -- WORD EventType
lpKeyDown = 4, -- BOOL bKeyDown
-- lpRptCount = 8, -- WORD wRepeatCount
lpVirtKey = 10, -- WORD wVirtualKeyCode
-- lpScanCode = 12, -- WORD wVirtualScanCode
lpKeyChar = 14 -- union WCHAR/CHAR AsciiChar
-- lpKeyState = 16 -- DWORD dwControlKeyState
-- clipboard support:
atom xGlobalLock, xGlobalUnlock, xGlobalSize, xGlobalAlloc, xGlobalFree,
user32, xCloseClipboard, xEmptyClipboard, xGetClipboardData,
xIsClipboardFormatAvailable, xOpenClipboard, xSetClipboardData,
xGetActiveWindow
constant CF_TEXT = 1,
GMEM_CLIPBOARD = #2002 --GMEM_MOVEABLE(#2) + GMEM_DDESHARE(#2000)
integer cinit=0 -- 0=totally uninitialised, 1=clipboard done,
-- 2=console done, 3=clip+console done
procedure Cinit(integer iflags)
if cinit=0 then
kernel32 = open_dll("kernel32.dll")
end if
if and_bits(iflags,2) and not and_bits(cinit,2) then
-- console support:
xAllocConsole = define_c_func(kernel32,"AllocConsole",
{}, -- no parameters
C_INT) -- BOOL
xGetStdHandle = define_c_func(kernel32,"GetStdHandle",
{C_LONG}, -- DWORD nStdHandle // input, output, or error device
C_PTR) -- HANDLE
xSetConsoleMode = define_c_func(kernel32,"SetConsoleMode",
{C_PTR, -- HANDLE hConsole, // handle of console input or screen buffer
C_LONG}, -- DWORD fdwMode // input or output mode to set
C_INT) -- BOOL
xReadConsoleInput = define_c_func(kernel32,"ReadConsoleInputA",
{C_PTR, -- HANDLE hConsoleInput, // handle of a console input buffer
C_PTR, -- PINPUT_RECORD pirBuffer, // address of the buffer for read data
C_INT, -- DWORD cInRecords, // number of records to read
C_PTR}, -- LPDWORD lpcRead // address of number of records read
C_LONG) -- BOOL
--/*
xWriteConsole = define_c_func(kernel32,"WriteConsoleA",
{C_PTR, -- HANDLE hConsoleOutput, // handle of a console screen buffer
C_PTR, -- CONST VOID *lpvBuffer, // address of buffer to write from
C_INT, -- DWORD cchToWrite, // number of characters to write
C_PTR, -- LPDWORD lpcchWritten, // address of number of characters written
C_PTR}, -- LPVOID lpvReserved // reserved
C_LONG) -- BOOL
--*/
lpBuffer = allocate(20)
lpEventsRead = allocate(4)
void = c_func(xAllocConsole,{})
stdin = c_func(xGetStdHandle,{STD_INPUT_HANDLE})
--/*
stdout = c_func(xGetStdHandle,{STD_OUTPUT_HANDLE})
bytes_count = allocate(4)
backspace3 = allocate(4)
poke(backspace3,{8,32,8,0})
--*/
end if
if and_bits(iflags,1) and not and_bits(cinit,1) then
-- clipboard support:
xGlobalLock = define_c_func(kernel32,"GlobalLock",{C_PTR},C_PTR)
xGlobalUnlock = define_c_func(kernel32,"GlobalUnlock",{C_PTR},C_INT)
xGlobalSize = define_c_func(kernel32,"GlobalSize",{C_PTR},C_INT)
xGlobalAlloc = define_c_func(kernel32,"GlobalAlloc",{C_UINT,C_LONG},C_PTR)
xGlobalFree = define_c_func(kernel32,"GlobalFree",{C_PTR},C_PTR)
user32 = open_dll("user32.dll")
xCloseClipboard = define_c_proc(user32,"CloseClipboard",{})
xEmptyClipboard = define_c_func(user32,"EmptyClipboard",{},C_INT)
xGetClipboardData = define_c_func(user32,"GetClipboardData",{C_UINT},C_UINT)
xIsClipboardFormatAvailable = define_c_func(user32,"IsClipboardFormatAvailable",{C_UINT},C_INT)
xOpenClipboard = define_c_func(user32,"OpenClipboard",{C_UINT},C_INT)
xSetClipboardData = define_c_func(user32,"SetClipboardData",{C_UINT,C_UINT},C_UINT)
xGetActiveWindow = define_c_func(user32,"GetActiveWindow", {}, C_PTR )
end if
cinit = or_bits(cinit,iflags)
end procedure
global string clip
global integer size = -1
global constant COPY=1, -- store size bytes from clip to the clipboard
-- (note length(clip) is allowed to be >= size)
PASTE=2 -- retrieve clip and set size
global procedure clipBoard(integer mode)
atom hClip, pData
atom cHwnd
integer wassize
wassize = size
size = -1
if not and_bits(cinit,1) then Cinit(1) end if
cHwnd = c_func(xGetActiveWindow, {})
if c_func(xOpenClipboard,{cHwnd}) then
if mode=COPY then
if c_func(xEmptyClipboard,{}) then
-- hClip = c_func(xGlobalAlloc,{GMEM_CLIPBOARD,size+1})
hClip = c_func(xGlobalAlloc,{GMEM_CLIPBOARD,wassize+1})
if hClip then
pData = c_func(xGlobalLock,{hClip})
if pData then
-- khres = 0
poke(pData,clip)
size = wassize
poke(pData+size,0)
void = c_func(xGlobalUnlock,{hClip})
void = c_func(xSetClipboardData,{CF_TEXT,hClip})
else
void = c_func(xGlobalFree,{hClip})
end if
end if
end if
elsif mode=PASTE then
size = -1
if c_func(xIsClipboardFormatAvailable,{CF_TEXT}) then
hClip = c_func(xGetClipboardData,{CF_TEXT})
pData = c_func(xGlobalLock,{hClip})
if pData then
size = c_func(xGlobalSize,{hClip})
clip = peek({pData,size})
void = c_func(xGlobalUnlock,{hClip})
size = find(0,clip)
if size then
size -= 1
clip = clip[1..size]
else
size = length(clip)
end if
end if
end if
else
?9/0 -- unknown mode parameter
end if
c_proc(xCloseClipboard,{})
end if
end procedure
-- /clipboard support
--object o
--o=0
--o=C_PTR
--?C_PTR
global constant G0_BACK = 8,
G0_TAB = 9,
G0_LF = 10, -- aka '\r'
G0_CLEAR = 12, -- Ctrl L
G0_CR = 13 -- aka '\n'
constant G__SHIFT = 16,
G__CONTROL = 17,
G__MENU = 18,
G__CAPSLOCK = 20
global constant G0_CTRLZ = 26,
G0_ESCAPE = 27,
G0_PGUP = 33,
G0_PGDN = 34
constant G__END = 35,
G__HOME = 36,
G__LEFT = 37
global constant G0_UP = 38
constant G__RIGHT = 39
global constant G0_DOWN = 40
constant G__INSERT = 45,
G__DELETE = 46
global constant G0_F1 = 112,
G0_F2 = 113,
-- G0_F3 = 114,
-- G0_F4 = 115,
-- G0_F5 = 116,
-- G0_F6 = 117,
G0_F7 = 118,
G0_F8 = 119
constant G__NUMLOCK = 144
constant G__SKIP = {G__SHIFT,G__CONTROL,G__MENU,G__CAPSLOCK,G__NUMLOCK,
G__HOME,G__END,G__LEFT,G__RIGHT,G__INSERT,G__DELETE}
--DEV now builtin:
function peek2u(atom addr)
return peek(addr) + peek(addr+1)*#100
end function
-- The RDS Eu console puts() routine does not seem to cope with displaying backspaces:
procedure back(integer n)
for i=1 to n do
--/**/ puts(1,G0_BACK)
--/*
poke(lpBuffer+lpKeyChar,G0_BACK)
void = c_func(xWriteConsole,{stdout,lpBuffer+lpKeyChar, 1, bytes_count, 0})
--*/
end for
end procedure
procedure kill(integer i)
for j=1 to i do
--/**/ puts(1,{8,32,8})
--/*
void = c_func(xWriteConsole,{stdout, backspace3, 3, bytes_count, 0})
--*/
end for
end procedure
global integer cpos, lr, overstrike, firstch, g0_addcr
g0_addcr = 1
global function gets0(integer r_keyhandler, string default_result, integer epos)
--global function gets0(integer r_keyhandler=-1, string default_result="", integer epos=-1) --DEV/SUG
--
-- Alternative hll implementation of gets(0), aka console string input.
-- **NB** does not work with console redirection.
-- Allows individual keystrokes to be intercepted and acted on.
-- Used by processCommandLine() in p.exw and (planned) by pdebug.e.
--
-- Usage:
-- r = gets0(r_keyHander, default_result).
--
-- where r_keyHander is a function_id which accepts three parameters:
-- ch: if zero see virtKey, else a normal ascii character or one of:
-- G0_BACK, TAB, LF, CLEAR, CR, CTRLZ, or ESCAPE.
-- virtKey: only used if ch is zero, can be tested for one of:
-- G0_PGUP, PGDN, UP, DOWN, F1, F2, F7, or F8, possibly others.
-- (for both the above you should note that the G__XXX constants
-- are local constants, and are not passed on to r_keyHander.)
-- r is a copy of the current input, for partial matching etc.
-- cpos, lr, and overstrike are also global for reference/update.
-- cpos is the cursor position, 0 for 1st, lr for after last.
-- lr is the length of r, overstrike if toggled by G__INSERT.
--
-- The return value of r_keyHandler can be:
-- 0: ignore this keystroke,
-- a normal ascii char or BACK..ESCAPE as above (process normally),
-- a sequence of length 3, containing in order:
-- 1) a replacement string.
-- 2) a new cpos, or -1 for "at end".
-- 3) an updated ch. If this is zero, no more processing occurs
-- on that character, if it is G0_CTRLZ(26) then input is
-- terminated, otherwise process the character normally -
-- typically this is used to advance cpos etc.
--
-- The return value of gets0() is always a sequence:
-- "" for escape/ctrl z at empty prompt,
-- "\n" for return
-- "xxx" if user terminated input using ctrl z
-- "xxx\n" if user terminated input using return
-- unless you have manually set g0_addcr to 0 (and it is your
-- responsibility to set it back to 1 if needed), in which case
-- the \n do not get appended.
--
-- processCommandLine() uses this to achieve the following aims:
-- F7 lists the prompt history (kept in p.ini).
-- F8 selects previous entry, wrapping around at the top.
-- up/down select previous/next entries.
-- page up/down select first/last entries.
-- a partial match can be auto-completed.
-- the previous entries can be edited:
-- Left/Right/Home/End move the cursor as expected.
-- Insert (invisibly) toggles insert(default)/overstrike mode.
-- Delete/Backspace work as expected.
-- Ctrl L performs a clear to end of field.
-- Ctrl C/V can be used (entire prompt only, since we have no
-- means of establishing a partial block selection, though) to
-- copy to or paste from the windows clipboard.
-- entries longer than (78-length_of_prompt) can be input. (only applies
-- when running RDS Eu; Phix builtin gets(0) never had this problem)
-- an escape kills the default_result, or if none quits the program.
-- F1 shows the help (by pretending "?\n" was input).
--
-- I will have a similar list for pdebug.e, when I get round to it.
--
-- Known buglette:
-- Some display hiccups occur on RDS Eu which are not evident on Phix.
-- (Occurs when holding down the up/down keys, amongst other things.)
--
-- See also:
-- demo/g0th.exw, a simple test harness for this routine.
--
-- Warning: this can be tough to debug, as trace(1) interferes with it,
-- quite inevitably, as to be expected, and quite madly/badly.
--
string r, s
object khres
integer ch, keyDown, virtKey
integer check_k3
if and_bits(cinit,3)!=3 then Cinit(3) end if
puts(1,default_result)
r = default_result
lr = length(r)
if epos=-1 then
epos = lr
end if
cpos = epos -- 0 is on 1st char, lr is after last char
back(lr-cpos)
ch = 0
overstrike = 0
firstch = 1
void = c_func(xSetConsoleMode,{stdin,0}) -- disable ENABLE_PROCESSED_INPUT
-- trace(1) -- NB: ** BAD IDEA! **
while 1 do
void = c_func(xReadConsoleInput,{stdin,lpBuffer,1,lpEventsRead}) -- one char at a time
if peek2u(lpBuffer+lpEventType)=KEY_EVENT then
keyDown = peek4s(lpBuffer+lpKeyDown)
if keyDown then
ch = peek(lpBuffer+lpKeyChar)
virtKey = 0
khres = ch
check_k3 = 0
if ch=0 then
virtKey = peek2u(lpBuffer+lpVirtKey)
if not find(virtKey,G__SKIP) then
khres = call_func(r_keyhandler,{ch,virtKey,r})
check_k3 = 1
end if
elsif ch=3 then -- Ctrl C (copy)
-- khres = 1
size = lr
clip = r
clipBoard(COPY)
-- if khres then
-- puts(1,"Ctrl C failed \n")
-- end if
khres = 0
elsif ch=22 then -- Ctrl V (paste)
-- puts(1,"Ctrl V\n")
size = 0
clipBoard(PASTE)
khres = 0
if size then
if clip[size]='\n' then
clip = clip[1..size-1]
end if
khres = {clip,-1,0}
end if
elsif ch!=G0_CLEAR then
khres = call_func(r_keyhandler,{ch,0,r})
check_k3 = 1
end if
if sequence(khres) then
lr = length(r) -- "old" length
if lr then
if cpos>lr then
kill(cpos-lr)
cpos = lr
else
puts(1,repeat(' ',lr-cpos))
kill(lr)
end if
end if
lr = length(khres) -- "new" length
if lr=3 then
void = khres[1]
if sequence(void) then
cpos = khres[2]
ch = khres[3]
khres = void
lr = length(khres)
if cpos=-1 then
cpos = lr
end if
firstch = -1 -- (prevent that firstch=1 below)
end if
elsif check_k3 then
?9/0
end if
r = khres
if ch!=G0_CTRLZ then
puts(1,r)
if virtKey=G0_F8 then
back(lr)
cpos = 0
else
if cpos<lr then
back(lr-cpos)
overstrike = 1
end if
end if
end if
if firstch=-1 then
firstch=0
elsif cpos=0 then
firstch = 1
end if
else
ch = khres
end if
if ch=0 then -- virtual keys (mostly ignored)
if virtKey=G__LEFT then
if cpos>0 then
cpos -= 1
back(1)
end if
elsif virtKey=G__RIGHT then
if cpos<lr then
cpos += 1
ch = r[cpos]
puts(1,ch)
end if
elsif virtKey=G__HOME then
if cpos then
back(cpos)
cpos = 0
end if
elsif virtKey=G__END then
if cpos<lr then
s = r[cpos+1..lr]
puts(1,s)
cpos = lr
end if
elsif virtKey=G__INSERT then
overstrike = not overstrike
elsif virtKey=G__DELETE then
if lr then
if cpos<lr then
s = r[cpos+2..lr]
r = r[1..cpos]
r &= s
puts(1,s)
puts(1,' ')
back(length(s)+1)
lr -= 1
else
kill(1)
lr -= 1
r = r[1..lr]
cpos -= 1
end if
end if
end if
elsif ch=G0_BACK then
-- if lr then
if cpos then -- 10/01/10
kill(1)
if cpos<lr then
s = r[cpos+1..lr]
cpos -= 1
r = r[1..cpos]
r &= s
puts(1,s)
puts(1,' ')
back(length(s)+1)
lr -= 1
else
lr -= 1
r = r[1..lr]
cpos -= 1
end if
end if
elsif ch=G0_TAB then -- ignore tab
elsif ch=G0_CLEAR -- Ctrl L
or ch=G0_ESCAPE then
if cpos<lr then
puts(1,repeat(' ',lr-cpos))
kill(lr-cpos)
r = r[1..cpos]
end if
if ch=G0_ESCAPE then
if lr then
if cpos then
kill(cpos)
r = ""
cpos = 0
end if
else
ch = G0_CTRLZ -- terminate input (on key up)
end if
end if
lr = cpos
elsif ch!=G0_CTRLZ then -- Ctrl Z (terminates input on key up)
if ch='\r'
or ch='\n' then
if g0_addcr then
r &= '\n'
end if
exit
end if
if firstch then
if lr then
if cpos<lr then
puts(1,repeat(' ',lr-cpos))
-- kill(lr-cpos)
-- r = r[1..cpos]
end if
-- if cpos then
-- kill(cpos)
cpos = 0
-- end if
kill(lr)
r = ""
lr = 0
end if
-- firstch = 0
end if
puts(1,ch)
if cpos<lr then
s = r[cpos+1+overstrike..lr]
r = r[1..cpos]
r &= ch
if length(s) then
r &= s
puts(1,s)
puts(1,' ')
back(length(s)+1)
end if
lr += 1-overstrike
else
r &= ch
lr += 1
end if
cpos += 1
firstch = 0
end if
elsif ch=G0_CTRLZ then
exit
end if
end if
end while
void = c_func(xSetConsoleMode,{stdin,ENABLE_PROCESSED_INPUT})
if cpos<lr then
if r[lr]='\n' then
lr -= 1
end if
s = r[cpos+1..lr]
puts(1,s)
end if
return r
end function
global procedure g0close()
if and_bits(cinit,2) then
free(lpBuffer)
free(lpEventsRead)
end if
end procedure