// Check that one-pass cutoff does trigger.
func TestOnePassCutoff(t *testing.T) {
re, err := syntax.Parse(`^x{1,1000}y{1,1000}$`, syntax.Perl)
if err != nil {
t.Fatalf("parse: %v", err)
}
p, err := syntax.Compile(re.Simplify())
if err != nil {
t.Fatalf("compile: %v", err)
}
if compileOnePass(p) != notOnePass {
t.Fatalf("makeOnePass succeeded; wanted notOnePass")
}
}
func compile(expr string, mode syntax.Flags, longest bool) (*Regexp, error) {
re, err := syntax.Parse(expr, mode)
if err != nil {
return nil, err
}
maxCap := re.MaxCap()
capNames := re.CapNames()
re = re.Simplify()
prog, err := syntax.Compile(re)
if err != nil {
return nil, err
}
regexp := &Regexp{
expr: expr,
prog: prog,
onepass: compileOnePass(prog),
numSubexp: maxCap,
subexpNames: capNames,
namedSubexp: make(map[string]int, len(capNames)),
cond: prog.StartCond(),
longest: longest,
}
for i, name := range capNames {
regexp.namedSubexp[name] = 2 * i
}
regexp.namedSubexp[""] = 0
if regexp.onepass == notOnePass {
regexp.prefix, regexp.prefixComplete = prog.Prefix()
} else {
regexp.prefix, regexp.prefixComplete, regexp.prefixEnd = onePassPrefix(prog)
}
if regexp.prefix != "" {
// TODO(rsc): Remove this allocation by adding
// IndexString to package bytes.
regexp.prefixBytes = []byte(regexp.prefix)
regexp.prefixRune, _ = utf8.DecodeRuneInString(regexp.prefix)
}
return regexp, nil
}
func TestCompileOnePass(t *testing.T) {
var (
p *syntax.Prog
re *syntax.Regexp
err error
)
for _, test := range onePassTests {
if re, err = syntax.Parse(test.re, syntax.Perl); err != nil {
t.Errorf("Parse(%q) got err:%s, want success", test.re, err)
continue
}
// needs to be done before compile...
re = re.Simplify()
if p, err = syntax.Compile(re); err != nil {
t.Errorf("Compile(%q) got err:%s, want success", test.re, err)
continue
}
onePass = compileOnePass(p)
if (onePass == notOnePass) != (test.onePass == notOnePass) {
t.Errorf("CompileOnePass(%q) got %v, expected %v", test.re, onePass, test.onePass)
}
}
}