69 lines
2.2 KiB
Go
69 lines
2.2 KiB
Go
package restful
|
|
|
|
// Copyright 2013 Ernest Micklei. All rights reserved.
|
|
// Use of this source code is governed by a license
|
|
// that can be found in the LICENSE file.
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"regexp"
|
|
"strings"
|
|
)
|
|
|
|
// PathExpression holds a compiled path expression (RegExp) needed to match against
|
|
// Http request paths and to extract path parameter values.
|
|
type pathExpression struct {
|
|
LiteralCount int // the number of literal characters (means those not resulting from template variable substitution)
|
|
VarCount int // the number of named parameters (enclosed by {}) in the path
|
|
Matcher *regexp.Regexp
|
|
Source string // Path as defined by the RouteBuilder
|
|
tokens []string
|
|
}
|
|
|
|
// NewPathExpression creates a PathExpression from the input URL path.
|
|
// Returns an error if the path is invalid.
|
|
func newPathExpression(path string) (*pathExpression, error) {
|
|
expression, literalCount, varCount, tokens := templateToRegularExpression(path)
|
|
compiled, err := regexp.Compile(expression)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &pathExpression{literalCount, varCount, compiled, expression, tokens}, nil
|
|
}
|
|
|
|
// http://jsr311.java.net/nonav/releases/1.1/spec/spec3.html#x3-370003.7.3
|
|
func templateToRegularExpression(template string) (expression string, literalCount int, varCount int, tokens []string) {
|
|
var buffer bytes.Buffer
|
|
buffer.WriteString("^")
|
|
//tokens = strings.Split(template, "/")
|
|
tokens = tokenizePath(template)
|
|
for _, each := range tokens {
|
|
if each == "" {
|
|
continue
|
|
}
|
|
buffer.WriteString("/")
|
|
if strings.HasPrefix(each, "{") {
|
|
// check for regular expression in variable
|
|
colon := strings.Index(each, ":")
|
|
if colon != -1 {
|
|
// extract expression
|
|
paramExpr := strings.TrimSpace(each[colon+1 : len(each)-1])
|
|
if paramExpr == "*" { // special case
|
|
buffer.WriteString("(.*)")
|
|
} else {
|
|
buffer.WriteString(fmt.Sprintf("(%s)", paramExpr)) // between colon and closing moustache
|
|
}
|
|
} else {
|
|
// plain var
|
|
buffer.WriteString("([^/]+?)")
|
|
}
|
|
varCount += 1
|
|
} else {
|
|
literalCount += len(each)
|
|
encoded := each // TODO URI encode
|
|
buffer.WriteString(regexp.QuoteMeta(encoded))
|
|
}
|
|
}
|
|
return strings.TrimRight(buffer.String(), "/") + "(/.*)?$", literalCount, varCount, tokens
|
|
}
|