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Add comparison operators ‘<’, ‘<=’, ‘>’ and ‘>=’

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This commit is contained in:
Eelco Dolstra 2013-08-02 18:39:40 +02:00
parent 47701677e8
commit 3d77b28eac
4 changed files with 31 additions and 1 deletions
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2
src/libexpr/lexer.l
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@ -101,6 +101,8 @@ or { return OR_KW; }
\=\= { return EQ; }
\!\= { return NEQ; }
\<\= { return LEQ; }
\>\= { return GEQ; }
\&\& { return AND; }
\|\| { return OR; }
\-\> { return IMPL; }

5
src/libexpr/parser.y
View file

@ -269,6 +269,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
%left OR
%left AND
%nonassoc EQ NEQ
%left '<' '>' LEQ GEQ
%right UPDATE
%left NOT
%left '+' '-'
@ -312,6 +313,10 @@ expr_op
| '-' expr_op %prec NEGATE { $$ = new ExprApp(new ExprApp(new ExprVar(data->symbols.create("__sub")), new ExprInt(0)), $2); }
| expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
| expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
| expr_op '<' expr_op { $$ = new ExprApp(new ExprApp(new ExprVar(data->symbols.create("__lessThan")), $1), $3); }
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprApp(new ExprApp(new ExprVar(data->symbols.create("__lessThan")), $3), $1)); }
| expr_op '>' expr_op { $$ = new ExprApp(new ExprApp(new ExprVar(data->symbols.create("__lessThan")), $3), $1); }
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprApp(new ExprApp(new ExprVar(data->symbols.create("__lessThan")), $1), $3)); }
| expr_op AND expr_op { $$ = new ExprOpAnd($1, $3); }
| expr_op OR expr_op { $$ = new ExprOpOr($1, $3); }
| expr_op IMPL expr_op { $$ = new ExprOpImpl($1, $3); }

2
tests/lang/eval-okay-arithmetic.exp
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@ -1 +1 @@
2170
2185

23
tests/lang/eval-okay-arithmetic.nix
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@ -18,6 +18,8 @@ let {
x = 12;
err = abort "urgh";
body = sum
[ (sum (range 1 50))
(123 + 456)
@ -28,5 +30,26 @@ let {
(3 * 4 * 5)
(56088 / 123 / 2)
(3 + 4 * const 5 0 - 6 / id 2)
(if 3 < 7 then 1 else err)
(if 7 < 3 then err else 1)
(if 3 < 3 then err else 1)
(if 3 <= 7 then 1 else err)
(if 7 <= 3 then err else 1)
(if 3 <= 3 then 1 else err)
(if 3 > 7 then err else 1)
(if 7 > 3 then 1 else err)
(if 3 > 3 then err else 1)
(if 3 >= 7 then err else 1)
(if 7 >= 3 then 1 else err)
(if 3 >= 3 then 1 else err)
(if 2 > 1 == 1 < 2 then 1 else err)
(if 1 + 2 * 3 >= 7 then 1 else err)
(if 1 + 2 * 3 < 7 then err else 1)
];
}