mirror of https://github.com/gohugoio/hugo.git
113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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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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//
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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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package metadecoders
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import (
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"path/filepath"
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"strings"
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"github.com/gohugoio/hugo/media"
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)
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type Format string
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const (
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// These are the supported metdata formats in Hugo. Most of these are also
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// supported as /data formats.
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ORG Format = "org"
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JSON Format = "json"
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TOML Format = "toml"
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YAML Format = "yaml"
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CSV Format = "csv"
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)
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// FormatFromString turns formatStr, typically a file extension without any ".",
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// into a Format. It returns an empty string for unknown formats.
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func FormatFromString(formatStr string) Format {
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formatStr = strings.ToLower(formatStr)
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if strings.Contains(formatStr, ".") {
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// Assume a filename
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formatStr = strings.TrimPrefix(filepath.Ext(formatStr), ".")
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}
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switch formatStr {
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case "yaml", "yml":
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return YAML
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case "json":
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return JSON
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case "toml":
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return TOML
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case "org":
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return ORG
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case "csv":
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return CSV
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}
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return ""
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}
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// FormatFromMediaType gets the Format given a MIME type, empty string
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// if unknown.
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func FormatFromMediaType(m media.Type) Format {
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for _, suffix := range m.Suffixes {
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if f := FormatFromString(suffix); f != "" {
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return f
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}
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}
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return ""
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}
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// FormatFromContentString tries to detect the format (JSON, YAML or TOML)
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// in the given string.
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// It return an empty string if no format could be detected.
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func (d Decoder) FormatFromContentString(data string) Format {
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csvIdx := strings.IndexRune(data, d.Delimiter)
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jsonIdx := strings.Index(data, "{")
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yamlIdx := strings.Index(data, ":")
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tomlIdx := strings.Index(data, "=")
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if isLowerIndexThan(csvIdx, jsonIdx, yamlIdx, tomlIdx) {
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return CSV
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}
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if isLowerIndexThan(jsonIdx, yamlIdx, tomlIdx) {
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return JSON
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}
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if isLowerIndexThan(yamlIdx, tomlIdx) {
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return YAML
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}
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if tomlIdx != -1 {
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return TOML
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}
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return ""
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}
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func isLowerIndexThan(first int, others ...int) bool {
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if first == -1 {
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return false
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}
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for _, other := range others {
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if other != -1 && other < first {
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return false
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}
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}
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return true
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}
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