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Commit6a5f9a0

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1 parent7581dc1 commit6a5f9a0

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561 files changed

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561 files changed

+1317112
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lines changed

‎.gitignore‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,3 @@
11
.vs/
22
obj/
3-
bin/
3+

‎ebOS/Calc.cs‎

Lines changed: 150 additions & 87 deletions
Original file line numberDiff line numberDiff line change
@@ -3,124 +3,187 @@
33
usingSystem.Text;
44
//using System.IO;
55
usingSys=Cosmos.System;
6+
// C# program to evaluate a given expression
7+
68
namespaceebOS
79
{
8-
publicclassCalc
10+
publicclassEvaluateString
911
{
10-
stringexpr;
11-
intpos;
12-
boolIsError=true;
13-
publicintRun()
12+
publicstaticstringEvaluate(stringexpression)
1413
{
15-
if(IsError){
16-
intans;
17-
do
14+
char[]tokens=expression.ToCharArray();
15+
16+
// Stack for numbers: 'values'
17+
Stack<float>values=newStack<float>();
18+
19+
// Stack for Operators: 'ops'
20+
Stack<char>ops=newStack<char>();
21+
22+
for(inti=0;i<tokens.Length;i++)
23+
{
24+
// Current token is a whitespace, skip it
25+
if(tokens[i]==' ')
26+
{
27+
continue;
28+
}
29+
30+
// Current token is a number,
31+
// push it to stack for numbers
32+
if(tokens[i]>='0'&&tokens[i]<='9')
1833
{
19-
pos=0;
20-
Console.Write("Enter expression (0 to quit): ");
21-
expr=Console.ReadLine();
22-
ans=addsubt();
23-
if(expr[index:pos]!='0')
34+
StringBuildersbuf=newStringBuilder();
35+
36+
// There may be more than
37+
// one digits in number
38+
while(i<tokens.Length&&
39+
tokens[i]>='0'&&
40+
tokens[i]<='9')
2441
{
25-
error();
42+
sbuf.Append(tokens[i++]);
2643
}
27-
if(ans!=0)
44+
values.Push(int.Parse(sbuf.ToString()));
45+
46+
// Right now the i points to
47+
// the character next to the digit,
48+
// since the for loop also increases
49+
// the i, we would skip one
50+
// token position; we need to
51+
// decrease the value of i by 1 to
52+
// correct the offset.
53+
i--;
54+
}
55+
56+
// Current token is an opening
57+
// brace, push it to 'ops'
58+
elseif(tokens[i]=='(')
59+
{
60+
ops.Push(tokens[i]);
61+
}
62+
63+
// Closing brace encountered,
64+
// solve entire brace
65+
elseif(tokens[i]==')')
66+
{
67+
while(ops.Peek()!='(')
68+
{
69+
values.Push(applyOp(ops.Pop(),
70+
values.Pop(),
71+
values.Pop()));
72+
}
73+
ops.Pop();
74+
}
75+
76+
// Current token is an operator.
77+
elseif(tokens[i]=='+'||
78+
tokens[i]=='-'||
79+
tokens[i]=='*'||
80+
tokens[i]=='/')
81+
{
82+
83+
// While top of 'ops' has same
84+
// or greater precedence to current
85+
// token, which is an operator.
86+
// Apply operator on top of 'ops'
87+
// to top two elements in values stack
88+
while(ops.Count>0&&
89+
hasPrecedence(tokens[i],
90+
ops.Peek()))
2891
{
29-
Console.WriteLine(ans.ToString());
92+
values.Push(applyOp(ops.Pop(),
93+
values.Pop(),
94+
values.Pop()));
3095
}
96+
97+
// Push current token to 'ops'.
98+
ops.Push(tokens[i]);
3199
}
32-
while(ans!=0);
33-
return0;
34100
}
35-
else
101+
102+
// Entire expression has been
103+
// parsed at this point, apply remaining
104+
// ops to remaining values
105+
while(ops.Count>0)
36106
{
37-
return15;
107+
values.Push(applyOp(ops.Pop(),
108+
values.Pop(),
109+
values.Pop()));
38110
}
111+
112+
// Top of 'values' contains
113+
// result, return it
114+
returnexpression+" = "+values.Pop().ToString();
39115
}
40-
intaddsubt()
116+
117+
// Returns true if 'op2' has
118+
// higher or same precedence as 'op1',
119+
// otherwise returns false.
120+
publicstaticboolhasPrecedence(charop1,
121+
charop2)
41122
{
42-
if(IsError)
43-
{
44-
intrtn=Multdiv();
45-
while(expr[index:pos]=='+'&&expr[index:pos]=='-')
123+
if(op2=='('||op2==')')
46124
{
47-
intop=expr[index:pos++];
48-
intopr2=Multdiv();
49-
if(op=='+')
50-
{
51-
rtn+=opr2;
52-
}
53-
else
54-
{
55-
rtn-=opr2;
56-
}
125+
returnfalse;
57126
}
58-
returnrtn;
127+
if((op1=='*'||op1=='/')&&
128+
(op2=='+'||op2=='-'))
129+
{
130+
returnfalse;
59131
}
60132
else
61133
{
62-
return0;
134+
returntrue;
63135
}
64136
}
65-
intMultdiv()
137+
138+
// A utility method to apply an
139+
// operator 'op' on operands 'a'
140+
// and 'b'. Return the result.
141+
publicstaticfloatapplyOp(charop,
142+
floatb,floata)
66143
{
67-
if(IsError)
68-
{
69-
intrtn=number();
70-
while(expr[index:pos]=='*'&&expr[index:pos]=='/')
144+
switch(op)
71145
{
72-
intop=expr[index:pos++];
73-
intopr2=number();
74-
if(op=='*')
75-
{
76-
rtn*=opr2;
77-
}
78-
else
79-
{
80-
rtn/=opr2;
81-
}
82-
}
83-
returnrtn;
84-
}
85-
else
86-
{
87-
return0;
146+
case'+':
147+
returna+b;
148+
case'-':
149+
returna-b;
150+
case'*':
151+
returna*b;
152+
case'/':
153+
if(b==0)
154+
{
155+
thrownew
156+
System.NotSupportedException(
157+
"Cannot divide by zero");
158+
}
159+
returna/b;
88160
}
161+
return0;
89162
}
90-
intnumber()
163+
164+
// Driver method to test above methods
165+
publicstaticvoidRun()
91166
{
92-
if(IsError)
93-
{
94-
intrtn;
95-
if(expr[index:pos]=='(')
167+
stringi;
168+
stringans;
169+
boolKeepRunning=true;
170+
while(KeepRunning)
96171
{
97-
pos++;
98-
rtn=addsubt();
99-
if(expr[index:pos]!=')')
172+
Console.Write("> ");
173+
i=Console.ReadLine();
174+
try
175+
{
176+
ans=Evaluate(i).ToString();
177+
Console.WriteLine(ans);
178+
}
179+
catch(Exception)
100180
{
101-
error();
102-
returnrtn;
181+
KeepRunning=false;
182+
Console.WriteLine("Error: syntax error");
103183
}
184+
185+
104186
}
105-
if(!char.IsDigit(expr[index:pos]))
106-
{
107-
error();
108-
}
109-
rtn=int.Parse(expr+pos);
110-
while(char.IsDigit(expr[index:pos]))
111-
{
112-
pos++;
113-
}
114-
returnrtn;
115-
}
116-
else
117-
{
118-
return0;
119-
}
120-
}
121-
voiderror()
122-
{
123-
IsError=false;
124187
}
125188
}
126189
}

‎ebOS/Kernel.cs‎

Lines changed: 9 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -28,7 +28,7 @@ void about()
2828
voidhelp()
2929
{
3030
Console.WriteLine("ebOS "+ver);
31-
Console.WriteLine(@"system commands:
31+
Console.WriteLine(@"system commands:
3232
shutdown - shut down
3333
reboot/restart - reboot the system
3434
@@ -38,6 +38,9 @@ void help()
3838
3939
other:
4040
zen - show the zen of python
41+
42+
apps:
43+
calc - calculator
4144
");
4245
//"hello - display greeting\n" +
4346
//"zen - display zen of python\n");
@@ -105,10 +108,13 @@ void help()
105108
about();
106109
break;
107110
*/
111+
//terminal
112+
case"cls":
113+
Console.Clear();
114+
break;
108115
//apps
109116
case"calc":
110-
Calccalc=newCalc();
111-
calc.Run();
117+
EvaluateString.Run();
112118
break;
113119
//no reason
114120
case"hello":
22.7 MB
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Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
1+
set timeout=0
2+
3+
menuentry 'ebOS' {
4+
multiboot2 /boot/ebOS.bin
5+
boot
6+
}
7.79 KB
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1.28 KB
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5.63 KB
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6.51 KB
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