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| author | Andy Chu <andychu@google.com> | 2016-03-15 13:42:30 -0700 |
|---|---|---|
| committer | Rob Landley <rob@landley.net> | 2016-03-16 11:59:56 -0500 |
| commit | 14c91c1ebd68daacce9794cf8894dcfea68efd7b (patch) | |
| tree | 052b6e72b9e3fa926e70a5f01690863836a8d2c6 /tests/expr.test | |
| parent | 2665cd0cf0d1116fae397d5b598a5ae1bd055afa (diff) | |
| download | toybox-14c91c1ebd68daacce9794cf8894dcfea68efd7b.tar.gz | |
Fix the operator precedence in expr.
expr now uses the precedence table specified by POSIX, implemented using
the "precedence climbing" algorithm. See the references at the top of
eval_expr().
This fixes 3 of 4 failing tests.
I also added more tests for correct behavior and for syntax errors.
This includes a new test exposing a segfault, related to type coercion.
Diffstat (limited to 'tests/expr.test')
| -rwxr-xr-x | tests/expr.test | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/tests/expr.test b/tests/expr.test index c95d0301..69e4bc4d 100755 --- a/tests/expr.test +++ b/tests/expr.test @@ -17,5 +17,38 @@ testing "% * same priority" "expr 3 % 2 \* 4" "4\n" "" "" testing "* % same priority" "expr 3 \* 2 % 4" "2\n" "" "" testing "= > same priority" "expr 0 = 2 \> 3" "0\n" "" "" testing "> = same priority" "expr 3 \> 2 = 1" "1\n" "" "" + +testing "/ by zero" "expr 1 / 0; echo \$?" "2\n" "" "" +testing "% by zero" "expr 1 % 0; echo \$?" "2\n" "" "" + +testing "regex position" "expr ab21xx : '[^0-9]*[0-9]*'" "4\n" "" "" +testing "regex extraction" "expr ab21xx : '[^0-9]*\([0-9]*\).*'" "21\n" "" "" +testing "regex no match" "expr ab21xx : x" "0\n" "" "" + +# result of ':' regex match can subsequently be used for arithmetic testing "string becomes integer" "expr ab21xx : '[^0-9]*\([0-9]*\)' + 3" \ "24\n" "" "" + +testing "integer comparison" "expr -3 \< -2" "1\n" "" "" +testing "string comparison" "expr -3 \< -2s" "0\n" "" "" +testing "integer expr comparison" "expr 2 - 5 \< -2" "1\n" "" "" +# result of arithmetic can subsequently be compared as a string +testing "string expr comparison" "expr 2 - 5 \< -2s" "0\n" "" "" + +testing "parens around literal" "expr \( a \)" "a\n" "" "" + +testing "exit code when true" "expr a; echo \$?" "a\n0\n" "" "" +testing "exit code when false" "expr 0; echo \$?" "0\n1\n" "" "" +testing "exit code with syntax error" "expr \(; echo \$?" "2\n" "" "" +testing "exit code when evaluating to 0" "expr -1 + 1; echo \$?" "0\n1\n" "" "" + +# BUG: segfaults because '3' is coerced to integer and regexc gets NULL +testing "regex segfault" "expr 3 : '\(.\)'" "3\n" "" "" + +# syntax errors +testing "no expression" "expr; echo \$?" "2\n" "" "" +testing "empty ()" "expr \( \); echo \$?" "2\n" "" "" +testing "missing )" "expr \( 1; echo \$?" "2\n" "" "" +testing "missing outer )" "expr \( 1 + \( 2 \* 3 \); echo \$?" "2\n" "" "" +testing "bad operator" "expr 1 @ 2; echo \$?" "2\n" "" "" +testing "adjacent literals" "expr 1 2; echo \$?" "2\n" "" "" |