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matchers.go
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/
matchers.go
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package match
import (
"bytes"
"fmt"
"reflect"
"strings"
"unsafe"
)
type equalsMatcher struct {
s string
bs []byte
}
type substringMatcher struct {
s string
bs []byte
}
type altSubstringMatcher struct {
literals [][]byte
}
type oneOfMatcher struct {
literals [][]byte
}
type prefixMatcher struct {
s []byte
}
type altPrefixMatcher struct {
literals [][]byte
}
type prefixNumDate struct {
minLen int
prefix []byte
digits []int
seps [][]byte
suffix []byte
}
type emptyStringMatcher struct{}
type emptyWhiteStringMatcher struct{}
type matchAny struct{}
func (m *equalsMatcher) MatchString(s string) bool {
return m.s == s
}
func (m *equalsMatcher) Match(bs []byte) bool {
return bytes.Equal(bs, m.bs)
}
func (m *equalsMatcher) String() string {
return fmt.Sprintf("<string '%v'>", m.s)
}
func (m *substringMatcher) MatchString(s string) bool {
return strings.Contains(s, m.s)
}
func (m *substringMatcher) Match(bs []byte) bool {
return bytes.Contains(bs, m.bs)
}
func (m *substringMatcher) String() string {
return fmt.Sprintf("<substring '%v'>", m.s)
}
func (m *altSubstringMatcher) MatchString(s string) bool {
return m.Match(stringToBytes(s))
}
func (m *altSubstringMatcher) Match(in []byte) bool {
for _, literal := range m.literals {
if bytes.Contains(in, literal) {
return true
}
}
return false
}
func (m *altSubstringMatcher) String() string {
return fmt.Sprintf("<alt substring '%s'>", bytes.Join(m.literals, []byte(",")))
}
func (m *oneOfMatcher) MatchString(s string) bool {
return m.Match(stringToBytes(s))
}
func (m *oneOfMatcher) Match(in []byte) bool {
for _, literal := range m.literals {
if bytes.Equal(in, literal) {
return true
}
}
return false
}
func (m *oneOfMatcher) String() string {
return fmt.Sprintf("<one of '%s'>", bytes.Join(m.literals, []byte(",")))
}
func (m *prefixMatcher) MatchString(s string) bool {
return len(s) >= len(m.s) && s[0:len(m.s)] == string(m.s)
}
func (m *prefixMatcher) Match(bs []byte) bool {
return len(bs) >= len(m.s) && bytes.Equal(bs[0:len(m.s)], m.s)
}
func (m *prefixMatcher) String() string {
return fmt.Sprintf("<prefix string '%v'>", string(m.s))
}
func (m *altPrefixMatcher) MatchString(in string) bool {
for _, s := range m.literals {
if len(in) >= len(s) && in[0:len(s)] == string(s) {
return true
}
}
return false
}
func (m *altPrefixMatcher) Match(bs []byte) bool {
for _, s := range m.literals {
if len(bs) >= len(s) && bytes.Equal(bs[0:len(s)], s) {
return true
}
}
return false
}
func (m *altPrefixMatcher) String() string {
return fmt.Sprintf("<alt prefix string '%s'>", bytes.Join(m.literals, []byte(",")))
}
func (m *prefixNumDate) MatchString(in string) bool {
return m.Match(stringToBytes(in))
}
func (m *prefixNumDate) Match(in []byte) bool {
if len(in) < m.minLen {
return false
}
pos := 0
if m.prefix != nil {
end := len(m.prefix)
if !bytes.Equal(in[0:end], m.prefix) {
return false
}
pos += end
}
for cnt := m.digits[0]; cnt > 0; cnt-- {
v := in[pos]
pos++
if !('0' <= v && v <= '9') {
return false
}
}
for i := 1; i < len(m.digits); i++ {
sep := m.seps[i-1]
if !bytes.Equal(in[pos:pos+len(sep)], sep) {
return false
}
pos += len(sep)
for cnt := m.digits[i]; cnt > 0; cnt-- {
v := in[pos]
pos++
if !('0' <= v && v <= '9') {
return false
}
}
}
if sfx := m.suffix; len(sfx) > 0 {
if !bytes.HasPrefix(in[pos:], sfx) {
return false
}
}
return true
}
func (m *prefixNumDate) String() string {
return "<prefix num date>"
}
func (m *emptyStringMatcher) MatchString(s string) bool {
return len(s) == 0
}
func (m *emptyStringMatcher) Match(bs []byte) bool {
return len(bs) == 0
}
func (m *emptyStringMatcher) String() string {
return "<empty>"
}
func (m *emptyWhiteStringMatcher) MatchString(s string) bool {
for _, r := range s {
if !(r == 0x9 || r == 0xa || r == 0xc || r == 0xd || r == 0x20 || r == '\t') {
return false
}
}
return true
}
func (m *emptyWhiteStringMatcher) Match(bs []byte) bool {
for _, r := range bytesToString(bs) {
if !(r == 0x9 || r == 0xa || r == 0xc || r == 0xd || r == 0x20 || r == '\t') {
return false
}
}
return true
}
func (m *emptyWhiteStringMatcher) String() string {
return "<empty whitespace>"
}
func (m *matchAny) Match(_ []byte) bool { return true }
func (m *matchAny) MatchString(_ string) bool { return true }
func (m *matchAny) String() string { return "<any>" }
func bytesToString(b []byte) string {
bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
sh := reflect.StringHeader{Data: bh.Data, Len: bh.Len}
return *(*string)(unsafe.Pointer(&sh))
}
func stringToBytes(s string) []byte {
sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
bh := reflect.SliceHeader{Data: sh.Data, Len: sh.Len, Cap: sh.Len}
return *(*[]byte)(unsafe.Pointer(&bh))
}