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Key.cpp
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258 lines (224 loc) · 6.03 KB
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#include "Key.h"
#include "UnicodeUtil.h"
#if _WIN32 || _WIN64
#define WINDOWS 1
#include <conio.h>
#else
#include <termios.h>
#include <unistd.h>
#include <sys/select.h>
#endif
namespace MiniScript {
SimpleVector<struct InputBufferEntry> inputBuffer;
ValueDict& KeyDefaultScanMap() {
static ValueDict scanMap;
if (scanMap.Count() == 0) {
#if WINDOWS
scanMap.SetValue(83, "\x7F"); // delete
scanMap.SetValue(72, "\x13"); // up
scanMap.SetValue(80, "\x14"); // down
scanMap.SetValue(77, "\x12"); // right
scanMap.SetValue(75, "\x11"); // left
scanMap.SetValue(71, "\x01"); // home
scanMap.SetValue(79, "\x05"); // end
#else
scanMap.SetValue("\x7F", "\x08"); // backspace
scanMap.SetValue("\x1B[3~", "\x7F"); // delete
scanMap.SetValue("\x1B[A", "\x13"); // up
scanMap.SetValue("\x1B[B", "\x14"); // down
scanMap.SetValue("\x1B[C", "\x12"); // right
scanMap.SetValue("\x1B[D", "\x11"); // left
scanMap.SetValue("\x1B[H", "\x01"); // home
scanMap.SetValue("\x1B[F", "\x05"); // end
#endif
}
return scanMap;
}
void KeyOptimizeScanMap(ValueDict& scanMap) {
for (ValueDictIterator kv = scanMap.GetIterator(); !kv.Done(); kv.Next()) {
Value k = kv.Key();
Value v = kv.Value();
if (k.type == ValueType::Number) {
ValueList optimizedKey;
optimizedKey.Add(Value::zero);
optimizedKey.Add(k);
scanMap.SetValue(optimizedKey, v);
} else if (k.type == ValueType::String) {
String kStr(k.ToString());
if (kStr.Length() == 0) continue;
String first(kStr.Substring(0, 1));
String rest(kStr.Substring(1));
ValueList optimizedKey;
optimizedKey.Add(UTF8Decode((unsigned char *)first.c_str()));
optimizedKey.Add(Value::zero);
if (rest.Length() == 0) {
scanMap.SetValue(optimizedKey, v);
} else {
Value subV = scanMap.Lookup(optimizedKey, Value::null);
if (subV.IsNull() || subV.type != ValueType::Map) {
ValueDict d;
scanMap.SetValue(optimizedKey, d);
}
ValueDict sub = scanMap.Lookup(optimizedKey, Value::null).GetDict();
sub.SetValue(rest, v);
KeyOptimizeScanMap(sub);
}
}
}
}
// Helper function to read all available characters from STDIN into the global input buffer.
void slurpStdin() {
#if WINDOWS
while (_kbhit()) {
struct InputBufferEntry e = {0, 0};
e.c = _getwch();
if (e.c == 0 || e.c == 0xE0) {
e.c = 0;
e.scanCode = _getwch();
}
inputBuffer.push_back(e);
}
#else
// Make terminal reads non-blocking
struct termios ttystate, backUp;
if (tcgetattr(STDIN_FILENO, &ttystate) < 0) return;
memcpy(&backUp, &ttystate, sizeof(ttystate));
ttystate.c_lflag &= ~ICANON;
ttystate.c_cc[VMIN] = 0;
ttystate.c_cc[VTIME] = 0;
if (tcsetattr(STDIN_FILENO, TCSANOW, &ttystate) < 0) return;
unsigned char buf[5] = {0, 0, 0, 0, 0};
unsigned char *p = buf;
while (true) {
// Check if there are some key presses
fd_set fds;
FD_ZERO(&fds);
FD_SET(STDIN_FILENO, &fds);
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
if (select(STDIN_FILENO + 1, &fds, nullptr, nullptr, &tv) < 0) break;
if (!FD_ISSET(STDIN_FILENO, &fds)) {
// Nothing's left to slurp ; save to the input buffer a current unsaved character
if (p > buf) {
struct InputBufferEntry e = {0, 0};
e.c = UTF8Decode(buf);
inputBuffer.push_back(e);
}
break;
}
// Read one byte from STDIN
if (read(STDIN_FILENO, p, 1) < 1) break;
if (p > buf && !IsUTF8IntraChar(*p)) {
// A new character has begun under `p`, save the previous one to the input buffer and continue slurping
struct InputBufferEntry e = {0, 0};
e.c = UTF8Decode(buf);
inputBuffer.push_back(e);
buf[0] = *p;
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
buf[4] = 0;
p = buf;
}
p++;
}
// Restore terminal
tcsetattr(STDIN_FILENO, TCSANOW, &backUp);
#endif
}
Value KeyAvailable() {
slurpStdin();
return Value::Truth(inputBuffer.size() > 0);
}
Value KeyGet(ValueDict& scanMap) {
slurpStdin();
if (inputBuffer.size() == 0) return Value::null;
struct InputBufferEntry e = inputBuffer[0];
struct InputBufferEntry initialE = e;
inputBuffer.deleteIdx(0);
int nScanned = 0;
while (true) {
ValueList optimizedKey;
optimizedKey.Add(e.c);
optimizedKey.Add(e.scanCode);
Value foundVal = scanMap.Lookup(optimizedKey, Value::null);
if (foundVal.IsNull()) break;
if (foundVal.type == ValueType::String) {
for (int i=0; i<nScanned; i++) {
inputBuffer.deleteIdx(0);
}
return foundVal;
} else if (foundVal.type == ValueType::Map) {
scanMap = foundVal.GetDict();
e = inputBuffer[nScanned++];
continue;
} else {
break; // malformed scan map
}
}
String s;
if (initialE.c == 0) {
s = "<" + String::Format((int)initialE.scanCode, "%d") + ">";
} else {
unsigned char buf[5] = {0, 0, 0, 0, 0};
long nBytes = UTF8Encode(initialE.c, buf);
s = String((char *)buf, nBytes);
}
Value v(s);
return v;
}
void KeyPutCodepoint(long codepoint, bool inFront) {
struct InputBufferEntry e = {0, 0};
e.c = codepoint;
if (inFront) {
inputBuffer.insert(e, 0);
} else {
inputBuffer.push_back(e);
}
}
void KeyPutString(String s, bool inFront) {
if (inFront) {
for (int i=s.Length()-1; i>=0; i--) {
struct InputBufferEntry e = {0, 0};
String character = s.Substring(i, 1);
e.c = UTF8Decode((unsigned char *)character.c_str());
inputBuffer.insert(e, 0);
}
} else {
for (int i=0; i<s.Length(); i++) {
struct InputBufferEntry e = {0, 0};
String character = s.Substring(i, 1);
e.c = UTF8Decode((unsigned char *)character.c_str());
inputBuffer.push_back(e);
}
}
}
void KeyClear() {
slurpStdin();
inputBuffer.deleteAll();
}
bool KeyGetEcho() {
#if WINDOWS
return false;
#else
struct termios ttystate;
if (tcgetattr(STDIN_FILENO, &ttystate) < 0) return false;
return ttystate.c_lflag & ECHO;
#endif
}
void KeySetEcho(bool on) {
#if WINDOWS
// no op
#else
struct termios ttystate;
if (tcgetattr(STDIN_FILENO, &ttystate) < 0) return;
if (on) {
ttystate.c_lflag |= ECHO;
} else {
ttystate.c_lflag &= ~ECHO;
}
tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
#endif
}
}