mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-09-07 01:26:43 +00:00
177 lines
5.2 KiB
Go
177 lines
5.2 KiB
Go
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// Copyright 2016, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package gax
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import (
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"errors"
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"fmt"
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"strings"
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)
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type matcher interface {
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match([]string) (int, error)
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String() string
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}
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type segment struct {
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matcher
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name string
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}
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type labelMatcher string
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func (ls labelMatcher) match(segments []string) (int, error) {
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if len(segments) == 0 {
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return 0, fmt.Errorf("expected %s but no more segments found", ls)
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}
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if segments[0] != string(ls) {
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return 0, fmt.Errorf("expected %s but got %s", ls, segments[0])
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}
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return 1, nil
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}
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func (ls labelMatcher) String() string {
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return string(ls)
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}
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type wildcardMatcher int
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func (wm wildcardMatcher) match(segments []string) (int, error) {
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if len(segments) == 0 {
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return 0, errors.New("no more segments found")
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}
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return 1, nil
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}
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func (wm wildcardMatcher) String() string {
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return "*"
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}
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type pathWildcardMatcher int
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func (pwm pathWildcardMatcher) match(segments []string) (int, error) {
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length := len(segments) - int(pwm)
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if length <= 0 {
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return 0, errors.New("not sufficient segments are supplied for path wildcard")
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}
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return length, nil
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}
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func (pwm pathWildcardMatcher) String() string {
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return "**"
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}
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type ParseError struct {
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Pos int
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Template string
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Message string
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}
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func (pe ParseError) Error() string {
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return fmt.Sprintf("at %d of template '%s', %s", pe.Pos, pe.Template, pe.Message)
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}
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// PathTemplate manages the template to build and match with paths used
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// by API services. It holds a template and variable names in it, and
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// it can extract matched patterns from a path string or build a path
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// string from a binding.
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//
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// See http.proto in github.com/googleapis/googleapis/ for the details of
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// the template syntax.
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type PathTemplate struct {
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segments []segment
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}
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// NewPathTemplate parses a path template, and returns a PathTemplate
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// instance if successful.
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func NewPathTemplate(template string) (*PathTemplate, error) {
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return parsePathTemplate(template)
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}
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// MustCompilePathTemplate is like NewPathTemplate but panics if the
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// expression cannot be parsed. It simplifies safe initialization of
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// global variables holding compiled regular expressions.
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func MustCompilePathTemplate(template string) *PathTemplate {
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pt, err := NewPathTemplate(template)
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if err != nil {
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panic(err)
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}
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return pt
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}
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// Match attempts to match the given path with the template, and returns
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// the mapping of the variable name to the matched pattern string.
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func (pt *PathTemplate) Match(path string) (map[string]string, error) {
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paths := strings.Split(path, "/")
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values := map[string]string{}
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for _, segment := range pt.segments {
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length, err := segment.match(paths)
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if err != nil {
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return nil, err
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}
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if segment.name != "" {
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value := strings.Join(paths[:length], "/")
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if oldValue, ok := values[segment.name]; ok {
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values[segment.name] = oldValue + "/" + value
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} else {
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values[segment.name] = value
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}
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}
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paths = paths[length:]
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}
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if len(paths) != 0 {
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return nil, fmt.Errorf("Trailing path %s remains after the matching", strings.Join(paths, "/"))
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}
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return values, nil
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}
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// Render creates a path string from its template and the binding from
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// the variable name to the value.
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func (pt *PathTemplate) Render(binding map[string]string) (string, error) {
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result := make([]string, 0, len(pt.segments))
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var lastVariableName string
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for _, segment := range pt.segments {
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name := segment.name
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if lastVariableName != "" && name == lastVariableName {
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continue
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}
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lastVariableName = name
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if name == "" {
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result = append(result, segment.String())
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} else if value, ok := binding[name]; ok {
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result = append(result, value)
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} else {
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return "", fmt.Errorf("%s is not found", name)
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}
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}
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built := strings.Join(result, "/")
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return built, nil
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}
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