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parser.go
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parser.go
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// Copyright (c) 2021 Terminus, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package runtime
import (
"strings"
"github.com/erda-project/erda-infra/pkg/transport/http/httprule"
)
// Matcher .
type Matcher interface {
Match(path string) (map[string]string, error)
IsStatic() bool
Fields() []string
Pattern() string
}
// Compile .
func Compile(path string) (Matcher, error) {
if len(path) <= 1 {
return &staticMacher{path}, nil
}
compiler, err := httprule.Parse(path)
if err != nil {
return nil, ErrInvalidPattern
}
temp := compiler.Compile()
if len(temp.Fields) <= 0 {
return &staticMacher{path}, nil
}
pattern, err := NewPattern(httprule.SupportPackageIsVersion1, temp.OpCodes, temp.Pool, temp.Verb)
if err != nil {
return nil, ErrInvalidPattern
}
return ¶msMatcher{&pattern, path, temp.Fields}, nil
}
type staticMacher struct {
path string
}
func (m *staticMacher) Match(path string) (map[string]string, error) {
if m.path == path {
return nil, nil
}
return nil, ErrNotMatch
}
func (m *staticMacher) IsStatic() bool { return true }
func (m *staticMacher) Fields() []string { return nil }
func (m *staticMacher) Pattern() string { return m.path }
type paramsMatcher struct {
p *Pattern
path string
fields []string
}
func (m *paramsMatcher) Match(path string) (map[string]string, error) {
if len(path) > 0 {
components := strings.Split(path[1:], "/")
last := len(components) - 1
var verb string
if idx := strings.LastIndex(components[last], ":"); idx >= 0 {
c := components[last]
components[last], verb = c[:idx], c[idx+1:]
}
return m.p.Match(components, verb)
}
return nil, ErrNotMatch
}
func (m *paramsMatcher) IsStatic() bool { return false }
func (m *paramsMatcher) Fields() []string { return m.fields }
func (m *paramsMatcher) Pattern() string { return m.path }