83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package types contains go type information, packaged in a way that makes
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// auto-generation convenient, whether by template or straight go functions.
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package types
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import (
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"fmt"
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"strings"
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)
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// ExtractCommentTags parses comments for lines of the form:
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//
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// 'marker' + "key=value".
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//
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// Values are optional; "" is the default. A tag can be specified more than
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// one time and all values are returned. If the resulting map has an entry for
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// a key, the value (a slice) is guaranteed to have at least 1 element.
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//
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// Example: if you pass "+" for 'marker', and the following lines are in
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// the comments:
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// +foo=value1
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// +bar
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// +foo=value2
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// +baz="qux"
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// Then this function will return:
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// map[string][]string{"foo":{"value1, "value2"}, "bar": {""}, "baz": {"qux"}}
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func ExtractCommentTags(marker string, lines []string) map[string][]string {
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out := map[string][]string{}
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for _, line := range lines {
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line = strings.Trim(line, " ")
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if len(line) == 0 {
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continue
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}
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if !strings.HasPrefix(line, marker) {
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continue
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}
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// TODO: we could support multiple values per key if we split on spaces
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kv := strings.SplitN(line[len(marker):], "=", 2)
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if len(kv) == 2 {
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out[kv[0]] = append(out[kv[0]], kv[1])
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} else if len(kv) == 1 {
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out[kv[0]] = append(out[kv[0]], "")
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}
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}
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return out
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}
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// ExtractSingleBoolCommentTag parses comments for lines of the form:
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//
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// 'marker' + "key=value1"
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//
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// If the tag is not found, the default value is returned. Values are asserted
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// to be boolean ("true" or "false"), and any other value will cause an error
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// to be returned. If the key has multiple values, the first one will be used.
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func ExtractSingleBoolCommentTag(marker string, key string, defaultVal bool, lines []string) (bool, error) {
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values := ExtractCommentTags(marker, lines)[key]
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if values == nil {
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return defaultVal, nil
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}
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if values[0] == "true" {
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return true, nil
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}
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if values[0] == "false" {
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return false, nil
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}
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return false, fmt.Errorf("tag value for %q is not boolean: %q", key, values[0])
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}
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