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dos: text substitution using dollar sign

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minjaesong
2021-01-29 10:28:56 +09:00
parent b73c000d43
commit 91fdc7ec99
15 changed files with 1050 additions and 550 deletions
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47
assets/disk0/tvdos/bin/command.js
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@@ -9,7 +9,12 @@ let DEBUG_PRINT = true;
let errorlevel = 0;
const termWidth = con.getmaxyx()[1];
const termHeight = con.getmaxyx()[0];
const welcome_text = "TSVM Disk Operating System, version " + _TVDOS.VERSION;
const greetLeftPad = (termWidth - welcome_text.length - 6) >> 1;
const greetRightPad = termWidth - greetLeftPad - welcome_text.length - 6;
function print_prompt_text() {
if (goFancy) {
@@ -38,11 +43,15 @@ function print_prompt_text() {
function greet() {
if (goFancy) {
con.color_pair(0,253);
//print(welcome_text + " ".repeat(_fsh.scrwidth - welcome_text.length));
print(welcome_text + " ".repeat(80 - welcome_text.length));
con.color_pair(239,255);
println();
con.clear();
con.color_pair(253,255);
print(' ');con.addch(17);
con.color_pair(0,253);
print(" ".repeat(greetLeftPad)+welcome_text+" ".repeat(greetRightPad));
con.color_pair(253,255);
con.addch(16);
con.move(3,1);
}
else
println(welcome_text);
@@ -62,6 +71,31 @@ function trimStartRevSlash(s) {
}
let shell = {};
shell.replaceVarCall = function(value) {
// syntax:
// line = literal [varcall] [literal] ;
// varcall = "$" ident ;
// ident = ? regex: [A-Za-z_]+ ? ;
// literal = ? you know what it is ? ;
let replaceMap = [];
let varMode = false;
let sb = '';
for (let i=0; i<value.length; i++) {
let char = value.charAt(i);
let cp = value.charCodeAt(i);
if (!varMode && char == '$') {
replaceMap.push({s:sb,r:false});
sb = ''; varMode = true;
}
else if (varMode && !(cp >= 48 && cp <= 57 || cp >= 65 && cp <= 90 || cp == 95 || cp >= 97 && cp <= 122)) {
replaceMap.push({s:sb,r:true});
sb = ''+char; varMode = false;
}
else sb += char;
}; replaceMap.push({s:sb,r:(varMode)});
return replaceMap.map(it => (it.r) ? _TVDOS.variables[it.s] : it.s).join('');
}
shell.getPwd = function() { return shell_pwd; }
shell.getCurrentDrive = function() { return CURRENT_DRIVE; }
// example input: echo "the string" > subdir\test.txt
@@ -211,7 +245,7 @@ shell.coreutils = {
},
echo: function(args) {
if (args[1] !== undefined) {
args.forEach(function(it,i) { if (i > 0) print(it+" ") });
args.forEach(function(it,i) { if (i > 0) print(shell.replaceVarCall(it)+" ") });
}
println();
},
@@ -245,8 +279,7 @@ shell.coreutils = {
println(_TVDOS.variables[key])
}
else {
// TODO parse %var_name% line
_TVDOS.variables[key] = value;
_TVDOS.variables[key] = shell.replaceVarCall(value);
}
}
},