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Copy pathregexp_codegen_test.go
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263 lines (242 loc) · 6.36 KB
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package regexp2
import (
"testing"
)
type emptyEngine struct {
findFirstChar func(r *Runner) bool
execute func(r *Runner) error
}
func (t *emptyEngine) FindFirstChar(r *Runner) bool {
return t.findFirstChar(r)
}
func (t *emptyEngine) Execute(r *Runner) error {
return t.execute(r)
}
func TestRegisterEngine_CacheHit(t *testing.T) {
didFindFirst := false
didExecute := false
engine := emptyEngine{
findFirstChar: func(r *Runner) bool {
didFindFirst = true
return true
},
execute: func(r *Runner) error {
didExecute = true
return nil
},
}
RegisterEngine("This is a regexp", RuntimeEngineData{
CapSize: 1,
FindFirstChar: engine.FindFirstChar,
Execute: engine.Execute,
}, RE2)
re := MustCompile("This is a regexp", RE2)
val, err := re.MatchString("This is a regexp")
if !didFindFirst {
t.Fatal("Expected find first char to be called, but it wasn't")
}
if !didExecute {
t.Fatal("Expected execute to be called, but it wasn't")
}
if err != nil {
t.Fatal("Unexpected error", err)
}
if val {
t.Fatal("Expected no match")
}
}
func TestRegisterEngine_QuickExecute(t *testing.T) {
const pattern = "quick-execute"
fullCalls := 0
quickCalls := 0
RegisterEngine(pattern, RuntimeEngineData{
CapSize: 1,
FindFirstChar: func(r *Runner) bool {
return r.Runtextpos == 0
},
Execute: func(r *Runner) error {
fullCalls++
r.Capture(0, 0, 1)
return nil
},
ExecuteQuick: func(r *Runner) error {
quickCalls++
r.Capture(0, 0, 1)
return nil
},
})
re := MustCompile(pattern)
if matched, err := re.MatchString("x"); err != nil || !matched {
t.Fatalf("MatchString = %v, %v; want true, nil", matched, err)
}
if fullCalls != 0 || quickCalls != 1 {
t.Fatalf("after MatchString: full calls = %d, quick calls = %d; want 0, 1", fullCalls, quickCalls)
}
if match, err := re.FindStringMatch("x"); err != nil || match == nil {
t.Fatalf("FindStringMatch = %v, %v; want match, nil", match, err)
}
if fullCalls != 1 || quickCalls != 1 {
t.Fatalf("after FindStringMatch: full calls = %d, quick calls = %d; want 1, 1", fullCalls, quickCalls)
}
}
func TestRegisterEngine_CacheKeyIncludesBacktrackingStackLimit(t *testing.T) {
const pattern = "stack-limit-cache-key"
register := func(limit, marker int) {
RegisterEngine(pattern, RuntimeEngineData{
CapSize: 1,
FindFirstChar: func(r *Runner) bool {
return r.Runtextpos == 0
},
Execute: func(r *Runner) error {
r.Runtextpos = marker
r.Capture(0, 0, marker)
return nil
},
}, OptionMaxBacktrackingStackSize(limit))
}
register(10, 1)
register(20, 2)
for _, tt := range []struct {
limit, wantLength int
}{
{limit: 10, wantLength: 1},
{limit: 20, wantLength: 2},
} {
re := MustCompile(pattern, OptionMaxBacktrackingStackSize(tt.limit))
match, err := re.FindStringMatch("xx")
if err != nil || match == nil {
t.Fatalf("limit %d: FindStringMatch = %v, %v; want match, nil", tt.limit, match, err)
}
if match.RuneLength != tt.wantLength {
t.Fatalf("limit %d: match length = %d, want %d", tt.limit, match.RuneLength, tt.wantLength)
}
}
}
func TestRegisterEngine_CacheMiss(t *testing.T) {
didFindFirst := false
didExecute := false
engine := emptyEngine{
findFirstChar: func(r *Runner) bool {
didFindFirst = true
return true
},
execute: func(r *Runner) error {
didExecute = true
return nil
},
}
RegisterEngine("This is a regexp", RuntimeEngineData{
CapSize: 1,
FindFirstChar: engine.FindFirstChar,
Execute: engine.Execute,
}, IgnoreCase)
// only difference in our cache is our options
re := MustCompile("This is a regexp")
val, err := re.MatchString("This is a regexp")
if didFindFirst {
t.Fatal("Expected find first to not be called, but it was")
}
if didExecute {
t.Fatal("Expected execute to not be called, but it was")
}
if err != nil {
t.Fatal("Unexpected error", err)
}
if !val {
t.Fatal("Expected match")
}
}
func TestRegisterEngine_CacheMissMaintainCaptureOrder(t *testing.T) {
didFindFirst := false
didExecute := false
engine := emptyEngine{
findFirstChar: func(r *Runner) bool {
didFindFirst = true
return true
},
execute: func(r *Runner) error {
didExecute = true
return nil
},
}
RegisterEngine("(?<first>This) (is)", RuntimeEngineData{
CapSize: 3,
FindFirstChar: engine.FindFirstChar,
Execute: engine.Execute,
})
re := MustCompile("(?<first>This) (is)", OptionMaintainCaptureOrder())
val, err := re.MatchString("This is")
if didFindFirst {
t.Fatal("Expected find first to not be called, but it was")
}
if didExecute {
t.Fatal("Expected execute to not be called, but it was")
}
if err != nil {
t.Fatal("Unexpected error", err)
}
if !val {
t.Fatal("Expected match")
}
}
func TestRegisterEngine_CacheHitMaintainCaptureOrder(t *testing.T) {
didFindFirst := false
didExecute := false
engine := emptyEngine{
findFirstChar: func(r *Runner) bool {
didFindFirst = true
return true
},
execute: func(r *Runner) error {
didExecute = true
return nil
},
}
RegisterEngine("(?<first>This) (is)", RuntimeEngineData{
CapSize: 3,
FindFirstChar: engine.FindFirstChar,
Execute: engine.Execute,
}, OptionMaintainCaptureOrder())
re := MustCompile("(?<first>This) (is)", OptionMaintainCaptureOrder())
val, err := re.MatchString("This is")
if !didFindFirst {
t.Fatal("Expected find first char to be called, but it wasn't")
}
if !didExecute {
t.Fatal("Expected execute to be called, but it wasn't")
}
if err != nil {
t.Fatal("Unexpected error", err)
}
if val {
t.Fatal("Expected no match")
}
}
func TestStringPrefixFilterSkipsDecodeOnMiss(t *testing.T) {
const pattern = `string-prefix-filter-miss-only`
RegisterEngine(pattern, RuntimeEngineData{
CapSize: 1,
StringPrefixFilter: func(input string, startAt int) (candidateByteIndex int, ok bool) {
if input != "missing" || startAt != 0 {
t.Fatalf("filter got input=%q startAt=%d", input, startAt)
}
return 0, false
},
FindFirstChar: func(r *Runner) bool {
t.Fatal("FindFirstChar should not run after a string prefix filter miss")
return false
},
Execute: func(r *Runner) error {
t.Fatal("Execute should not run after a string prefix filter miss")
return nil
},
})
re := MustCompile(pattern)
matched, err := re.MatchString("missing")
if err != nil {
t.Fatalf("MatchString failed: %v", err)
}
if matched {
t.Fatal("unexpected match")
}
}