e3.testsuite.optfileparser: restrict syntax for discriminants

Restrict the set of characters that can appear in discriminant lists in
opt files to alphanumerics, '+', '.', '_' and '-'.

NEWS.md

@@ -1,6 +1,7 @@
 27.0 (Not released yet)
 =======================
 
+* `e3.testsuite.optfileparser`: restrict syntax for discriminants.
 * Fix test filtering when not all test finders have dedicated directories.
 * `PatternSubstitute`: update annotations to accept replacement callbacks.
 * `e3.testsuite.report.xunit`: add a `XUnitImportApp` class to make it possible

src/e3/testsuite/optfileparser.py

@@ -22,7 +22,17 @@
 
 
 # Regexp that matches valid lines in test.opt files
-OPTLINE_REGEXPS = re.compile(r"^([^\s]+)(\s+([a-zA-Z0-9_-]+)(\s+(.*))?)?$")
+OPTLINE_REGEXPS = re.compile(
+    # Comma-separated list of discriminants
+    r"^([a-zA-Z0-9!+,._-]+)"
+    # The rest is optional...
+    "("
+    # Command
+    r"\s+([a-zA-Z0-9_-]+)"
+    # Optional command argument
+    r"(\s+(.*))?"
+    ")?$"
+)
 
 
 class BadFormattingError(Exception):

tests/tests/optfiles/sharp_in_comment.opt

@@ -0,0 +1 @@
+ALL DEAD # This # can # contain # sharps

tests/tests/optfiles/syntax_error_3.opt

@@ -0,0 +1 @@
+# This is not a comment and should be rejected

tests/tests/test_optfileparser.py

@@ -220,3 +220,19 @@ def test_check_syntax_main():
     p = Run(["e3-opt-check", "dead.opt", "tags.opt"], cwd=optfiles_dir)
     assert p.status == 0
     assert p.out == ""
+
+
+def test_sharp():
+    """Check the handling for lines that contain '#'."""
+    of = parse_file("sharp_in_comment.opt")
+    assert of.get_value("dead") == "# This # can # contain # sharps"
+
+    try:
+        parse_file("syntax_error_3.opt")
+    except BadFormattingError as exc:
+        assert str(exc) == (
+            "Can not parse line 1:"
+            " # This is not a comment and should be rejected"
+        )
+    else:
+        raise AssertionError()