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basic interpreter wip

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This commit is contained in:
minjaesong
2020-05-20 05:37:36 +09:00
parent a1e053c53e
commit 904c080731
10 changed files with 205 additions and 46 deletions
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52
assets/jscon.js
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@@ -1,68 +1,70 @@
println("JS Console");
var cmdHistory = []; // zeroth element is the oldest
var cmdHistoryScroll = 0; // 0 for outside-of-buffer, 1 for most recent
var _cmdHistory = []; // zeroth element is the oldest
var _cmdHistoryScroll = 0; // 0 for outside-of-buffer, 1 for most recent
while (true) {
print("JS> ");
var cmdbuf = "";
var _cmdbuf = "";
while (true) {
var key = vm.readKey();
var key = con.getch();
// printable chars
if (key >= 32 && key <= 126) {
var s = String.fromCharCode(key);
cmdbuf += s;
print(s);
var __sss = String.fromCharCode(key);
_cmdbuf += __sss;
print(__sss);
}
// backspace
else if (key === 8 && cmdbuf.length > 0) {
cmdbuf = cmdbuf.substring(0, cmdbuf.length - 1);
else if (key === 8 && _cmdbuf.length > 0) {
_cmdbuf = _cmdbuf.substring(0, _cmdbuf.length - 1);
print(String.fromCharCode(key));
}
// enter
else if (key === 10 || key === 13) {
println();
try {
println(eval(cmdbuf));
println(eval(_cmdbuf));
}
catch (e) {
println(e);
}
finally {
if (cmdbuf.trim().length > 0)
cmdHistory.push(cmdbuf);
if (_cmdbuf.trim().length > 0)
_cmdHistory.push(_cmdbuf);
cmdHistoryScroll = 0;
_cmdHistoryScroll = 0;
break;
}
}
// up arrow
else if (key === 19 && cmdHistory.length > 0 && cmdHistoryScroll < cmdHistory.length) {
cmdHistoryScroll += 1;
else if (key === 19 && _cmdHistory.length > 0 && _cmdHistoryScroll < _cmdHistory.length) {
_cmdHistoryScroll += 1;
// back the cursor in order to type new cmd
for (xx = 0; xx < cmdbuf.length; xx++) print(String.fromCharCode(8));
cmdbuf = cmdHistory[cmdHistory.length - cmdHistoryScroll];
var __xx = 0;
for (__xx = 0; __xx < _cmdbuf.length; __xx++) print(String.fromCharCode(8));
_cmdbuf = _cmdHistory[_cmdHistory.length - _cmdHistoryScroll];
// re-type the new command
print(cmdbuf);
print(_cmdbuf);
}
// down arrow
else if (key === 20) {
if (cmdHistoryScroll > 0) {
if (_cmdHistoryScroll > 0) {
// back the cursor in order to type new cmd
for (xx = 0; xx < cmdbuf.length; xx++) print(String.fromCharCode(8));
cmdbuf = cmdHistory[cmdHistory.length - cmdHistoryScroll];
var __xx = 0;
for (__xx = 0; __xx < _cmdbuf.length; __xx++) print(String.fromCharCode(8));
_cmdbuf = _cmdHistory[_cmdHistory.length - _cmdHistoryScroll];
// re-type the new command
print(cmdbuf);
print(_cmdbuf);
cmdHistoryScroll -= 1;
_cmdHistoryScroll -= 1;
}
else {
// back the cursor in order to type new cmd
for (xx = 0; xx < cmdbuf.length; xx++) print(String.fromCharCode(8));
cmdbuf = "";
for (__xx = 0; __xx < _cmdbuf.length; __xx++) print(String.fromCharCode(8));
_cmdbuf = "";
}
}
}