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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package testing
import (
"fmt"
"os"
"strconv"
"strings"
"sync"
)
// matcher sanitizes, uniques, and filters names of subtests and subbenchmarks.
type matcher struct {
filter filterMatch
matchFunc func(pat, str string) (bool, error)
mu sync.Mutex
subNames map[string]int64
}
type filterMatch interface {
// matches checks the name against the receiver's pattern strings using the
// given match function.
matches(name []string, matchString func(pat, str string) (bool, error)) (ok, partial bool)
// verify checks that the receiver's pattern strings are valid filters by
// calling the given match function.
verify(name string, matchString func(pat, str string) (bool, error)) error
}
// simpleMatch matches a test name if all of the pattern strings match in
// sequence.
type simpleMatch []string
// alternationMatch matches a test name if one of the alternations match.
type alternationMatch []filterMatch
// TODO: fix test_main to avoid race and improve caching, also allowing to
// eliminate this Mutex.
var matchMutex sync.Mutex
func newMatcher(matchString func(pat, str string) (bool, error), patterns, name string) *matcher {
var impl filterMatch
if patterns != "" {
impl = splitRegexp(patterns)
if err := impl.verify(name, matchString); err != nil {
fmt.Fprintf(os.Stderr, "testing: invalid regexp for %s\n", err)
os.Exit(1)
}
}
return &matcher{
filter: impl,
matchFunc: matchString,
subNames: map[string]int64{},
}
}
func (m *matcher) fullName(c *common, subname string) (name string, ok, partial bool) {
name = subname
m.mu.Lock()
defer m.mu.Unlock()
if c != nil && c.level > 0 {
name = m.unique(c.name, rewrite(subname))
}
matchMutex.Lock()
defer matchMutex.Unlock()
if m.filter == nil {
return name, true, false
}
// We check the full array of paths each time to allow for the case that
// a pattern contains a '/'.
elem := strings.Split(name, "/")
ok, partial = m.filter.matches(elem, m.matchFunc)
return name, ok, partial
}
func (m simpleMatch) matches(name []string, matchString func(pat, str string) (bool, error)) (ok, partial bool) {
for i, s := range name {
if i >= len(m) {
break
}
if ok, _ := matchString(m[i], s); !ok {
return false, false
}
}
return true, len(name) < len(m)
}
func (m simpleMatch) verify(name string, matchString func(pat, str string) (bool, error)) error {
for i, s := range m {
m[i] = rewrite(s)
}
// Verify filters before doing any processing.
for i, s := range m {
if _, err := matchString(s, "non-empty"); err != nil {
return fmt.Errorf("element %d of %s (%q): %s", i, name, s, err)
}
}
return nil
}
func (m alternationMatch) matches(name []string, matchString func(pat, str string) (bool, error)) (ok, partial bool) {
for _, m := range m {
if ok, partial = m.matches(name, matchString); ok {
return ok, partial
}
}
return false, false
}
func (m alternationMatch) verify(name string, matchString func(pat, str string) (bool, error)) error {
for i, m := range m {
if err := m.verify(name, matchString); err != nil {
return fmt.Errorf("alternation %d of %s", i, err)
}
}
return nil
}
func splitRegexp(s string) filterMatch {
a := make(simpleMatch, 0, strings.Count(s, "/"))
b := make(alternationMatch, 0, strings.Count(s, "|"))
cs := 0
cp := 0
for i := 0; i < len(s); {
switch s[i] {
case '[':
cs++
case ']':
if cs--; cs < 0 { // An unmatched ']' is legal.
cs = 0
}
case '(':
if cs == 0 {
cp++
}
case ')':
if cs == 0 {
cp--
}
case '\\':
i++
case '/':
if cs == 0 && cp == 0 {
a = append(a, s[:i])
s = s[i+1:]
i = 0
continue
}
case '|':
if cs == 0 && cp == 0 {
a = append(a, s[:i])
s = s[i+1:]
i = 0
b = append(b, a)
a = make(simpleMatch, 0, len(a))
continue
}
}
i++
}
a = append(a, s)
if len(b) == 0 {
return a
}
return append(b, a)
}
// unique creates a unique name for the given parent and subname by affixing it
// with one or more counts, if necessary.
func (m *matcher) unique(parent, subname string) string {
name := fmt.Sprintf("%s/%s", parent, subname)
empty := subname == ""
for {
next, exists := m.subNames[name]
if !empty && !exists {
m.subNames[name] = 1 // next count is 1
return name
}
// Name was already used. We increment with the count and append a
// string with the count.
m.subNames[name] = next + 1
// Add a count to guarantee uniqueness.
name = fmt.Sprintf("%s#%02d", name, next)
empty = false
}
}
// rewrite rewrites a subname to having only printable characters and no white
// space.
func rewrite(s string) string {
b := []byte{}
for _, r := range s {
switch {
case isSpace(r):
b = append(b, '_')
case !strconv.IsPrint(r):
s := strconv.QuoteRune(r)
b = append(b, s[1:len(s)-1]...)
default:
b = append(b, string(r)...)
}
}
return string(b)
}
func isSpace(r rune) bool {
if r < 0x2000 {
switch r {
// Note: not the same as Unicode Z class.
case '\t', '\n', '\v', '\f', '\r', ' ', 0x85, 0xA0, 0x1680:
return true
}
} else {
if r <= 0x200a {
return true
}
switch r {
case 0x2028, 0x2029, 0x202f, 0x205f, 0x3000:
return true
}
}
return false
}
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