70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
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// Copyright 2018 Twitch Interactive, Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"). You may not
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// use this file except in compliance with the License. A copy of the License is
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// located at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// or in the "license" file accompanying this file. This file is distributed on
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// an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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// express or implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package main
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import (
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"fmt"
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"strings"
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)
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type commandLineParams struct {
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importPrefix string // String to prefix to imported package file names.
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importMap map[string]string // Mapping from .proto file name to import path.
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tpl bool // generate grpc compatible interface
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}
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// parseCommandLineParams breaks the comma-separated list of key=value pairs
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// in the parameter (a member of the request protobuf) into a key/value map.
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// It then sets command line parameter mappings defined by those entries.
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func parseCommandLineParams(parameter string) (*commandLineParams, error) {
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ps := make(map[string]string)
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for _, p := range strings.Split(parameter, ",") {
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if p == "" {
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continue
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}
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i := strings.Index(p, "=")
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if i < 0 {
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return nil, fmt.Errorf("invalid parameter %q: expected format of parameter to be k=v", p)
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}
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k := p[0:i]
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v := p[i+1:]
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if v == "" {
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return nil, fmt.Errorf("invalid parameter %q: expected format of parameter to be k=v", k)
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}
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ps[k] = v
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}
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clp := &commandLineParams{
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importMap: make(map[string]string),
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}
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for k, v := range ps {
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switch {
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case k == "tpl":
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if v == "true" || v == "1" {
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clp.tpl = true
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}
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case k == "import_prefix":
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clp.importPrefix = v
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// Support import map 'M' prefix per https://github.com/golang/protobuf/blob/6fb5325/protoc-gen-go/generator/generator.go#L497.
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case len(k) > 0 && k[0] == 'M':
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clp.importMap[k[1:]] = v // 1 is the length of 'M'.
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case len(k) > 0 && strings.HasPrefix(k, "go_import_mapping@"):
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clp.importMap[k[18:]] = v // 18 is the length of 'go_import_mapping@'.
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default:
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return nil, fmt.Errorf("unknown parameter %q", k)
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}
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}
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return clp, nil
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}
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