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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
199087 changed files with 3378941 additions and 0 deletions
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63
Task/Parsing-Shunting-yard-algorithm/XPL0/parsing-shunting-yard-algorithm.xpl0 Normal file
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int Stack(10);
int SP; \stack pointer
proc Push(N);
int N;
[Stack(SP):= N; SP:= SP+1];
func Pop;
[SP:= SP-1; return Stack(SP)];
func Precedence(Op);
int Op;
case Op of
^+, ^-: return 2;
^*, ^/: return 3;
^^: return 4
other [];
proc ShowStack;
int I;
[ChOut(0, 9\tab\);
for I:= 0 to SP-1 do
[ChOut(0, Stack(I)); ChOut(0, ^ )];
CrLf(0);
];
char Str;
int Token, Op1, Op2;
[Str:= "3 + 4 * 2 / ( 1 - 5 ) ^^ 2 ^^ 3 ";
SP:= 0;
Text(0, "Input Output Stack^m^j");
loop [repeat Token:= Str(0); Str:= Str+1;
until Token # ^ ; \skip space characters
if Token # $A0 \terminating space\ then
[ChOut(0, Token); ChOut(0, 9\tab\)];
case Token of
^+, ^-, ^*, ^/, ^^:
[Op1:= Token;
loop [if SP <= 0 then quit; \empty
Op2:= Stack(SP-1);
if Op2 = ^( then quit;
if Precedence(Op2) < Precedence(Op1) then quit;
if Precedence(Op2) = Precedence(Op1) then
if Op1 = ^^ then quit;
ChOut(0, Pop);
];
Push(Op1);
];
^(: Push(Token);
^): [while SP > 0 and Stack(SP-1) # ^( do
ChOut(0, Pop);
Pop; \discard left parenthesis
];
$A0: quit \terminating space with MSB set
other ChOut(0, Token); \print single digit number
ShowStack;
];
while SP > 0 do \print any remaining operators
[ChOut(0, 9\tab\);
ChOut(0, Pop);
ShowStack;
];
]