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If/then/else clauses

This commit is contained in:
Yohann D'ANELLO 2020-05-16 02:59:03 +02:00
parent c78a047ec3
commit d64ba3eaac
3 changed files with 39 additions and 6 deletions
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12
syntaxique/lang.y
View File

@ -122,7 +122,7 @@ stmt* make_stmt (int type, var *var, expr *expr,
%type <e> expr
%type <s> stmt assign
%token BOOL WHILE DO OD ASSIGN PRINT OR AND XOR NOT TRUE FALSE
%token BOOL WHILE DO OD IF THEN ELSE FI ASSIGN PRINT OR AND XOR NOT TRUE FALSE
%token <i> IDENT
%left ';'
@ -146,6 +146,10 @@ stmt : assign
{ $$ = make_stmt(';',NULL,NULL,$1,$3,NULL); }
| WHILE expr DO stmt OD
{ $$ = make_stmt(WHILE,NULL,$2,$4,NULL,NULL); }
| IF expr THEN stmt ELSE stmt FI
{ $$ = make_stmt(IF,NULL,$2,$4,$6,NULL); }
| IF expr THEN stmt FI
{ $$ = make_stmt(IF,NULL,$2,$4,NULL,NULL); }
| PRINT varlist
{ $$ = make_stmt(PRINT,NULL,NULL,NULL,NULL,$2); }
@ -216,6 +220,12 @@ void execute (stmt *s)
case WHILE:
while (eval(s->expr)) execute(s->left);
break;
case IF:
if (eval(s->expr))
execute(s->left);
else if (s->right != NULL)
execute(s->right);
break;
case PRINT:
print_vars(s->list);
puts("");

4
syntaxique/langlex.l
View File

@ -8,6 +8,10 @@ DIG [0-9]
"while" { return WHILE; }
"do" { return DO; }
"od" { return OD; }
"if" { return IF; }
"then" { return THEN; }
"fi" { return FI; }
"else" { return ELSE; }
"print" { return PRINT; }
"true" { return TRUE; }
"false" { return FALSE; }

29
syntaxique/test.my
View File

@ -2,20 +2,39 @@ bool x,y,z;
x := true;
y := true;
z := x <=> y;
print x,y,z;
if x <=> y then
z := x && y;
print x,y,z
else
print y,x,z
fi;
x := true;
y := false;
z := x <=> y;
print x,y,z;
if x <=> y then
z := x && y;
print x,y,z
else
print y,x,z
fi;
x := false;
y := true;
z := x <=> y;
print x,y,z;
if x <=> y then
z := x && y;
print x,y,z
else
print y,x,z
fi;
x := false;
y := false;
z := x <=> y;
print x,y,z
if x <=> y then
z := x && y;
print x,y,z
else
print y,x,z
fi