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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package highlight provides code highlighting.
package highlight
import (
"fmt"
"strconv"
"strings"
"github.com/alecthomas/chroma/formatters/html"
"github.com/gohugoio/hugo/config"
"github.com/mitchellh/mapstructure"
)
var DefaultConfig = Config{
// The highlighter style to use.
// See https://xyproto.github.io/splash/docs/all.html
Style: "monokai",
LineNoStart: 1,
CodeFences: true,
NoClasses: true,
LineNumbersInTable: true,
TabWidth: 4,
}
//
type Config struct {
Style string
CodeFences bool
// Use inline CSS styles.
NoClasses bool
// When set, line numbers will be printed.
LineNos bool
LineNumbersInTable bool
// When set, add links to line numbers
AnchorLineNos bool
LineAnchors string
// Start the line numbers from this value (default is 1).
LineNoStart int
// A space separated list of line numbers, e.g. “3-8 10-20”.
Hl_Lines string
// TabWidth sets the number of characters for a tab. Defaults to 4.
TabWidth int
GuessSyntax bool
}
func (cfg Config) ToHTMLOptions() []html.Option {
var lineAnchors string
if cfg.LineAnchors != "" {
lineAnchors = cfg.LineAnchors + "-"
}
options := []html.Option{
html.TabWidth(cfg.TabWidth),
html.WithLineNumbers(cfg.LineNos),
html.BaseLineNumber(cfg.LineNoStart),
html.LineNumbersInTable(cfg.LineNumbersInTable),
html.WithClasses(!cfg.NoClasses),
html.LinkableLineNumbers(cfg.AnchorLineNos, lineAnchors),
}
if cfg.Hl_Lines != "" {
ranges, err := hlLinesToRanges(cfg.LineNoStart, cfg.Hl_Lines)
if err == nil {
options = append(options, html.HighlightLines(ranges))
}
}
return options
}
func applyOptionsFromString(opts string, cfg *Config) error {
optsm, err := parseOptions(opts)
if err != nil {
return err
}
return mapstructure.WeakDecode(optsm, cfg)
}
// ApplyLegacyConfig applies legacy config from back when we had
// Pygments.
func ApplyLegacyConfig(cfg config.Provider, conf *Config) error {
if conf.Style == DefaultConfig.Style {
if s := cfg.GetString("pygmentsStyle"); s != "" {
conf.Style = s
}
}
if conf.NoClasses == DefaultConfig.NoClasses && cfg.IsSet("pygmentsUseClasses") {
conf.NoClasses = !cfg.GetBool("pygmentsUseClasses")
}
if conf.CodeFences == DefaultConfig.CodeFences && cfg.IsSet("pygmentsCodeFences") {
conf.CodeFences = cfg.GetBool("pygmentsCodeFences")
}
if conf.GuessSyntax == DefaultConfig.GuessSyntax && cfg.IsSet("pygmentsCodefencesGuessSyntax") {
conf.GuessSyntax = cfg.GetBool("pygmentsCodefencesGuessSyntax")
}
if cfg.IsSet("pygmentsOptions") {
if err := applyOptionsFromString(cfg.GetString("pygmentsOptions"), conf); err != nil {
return err
}
}
return nil
}
func parseOptions(in string) (map[string]interface{}, error) {
in = strings.Trim(in, " ")
opts := make(map[string]interface{})
if in == "" {
return opts, nil
}
for _, v := range strings.Split(in, ",") {
keyVal := strings.Split(v, "=")
key := strings.ToLower(strings.Trim(keyVal[0], " "))
if len(keyVal) != 2 {
return opts, fmt.Errorf("invalid Highlight option: %s", key)
}
if key == "linenos" {
opts[key] = keyVal[1] != "false"
if keyVal[1] == "table" || keyVal[1] == "inline" {
opts["lineNumbersInTable"] = keyVal[1] == "table"
}
} else {
opts[key] = keyVal[1]
}
}
return opts, nil
}
// startLine compansates for https://github.com/alecthomas/chroma/issues/30
func hlLinesToRanges(startLine int, s string) ([][2]int, error) {
var ranges [][2]int
s = strings.TrimSpace(s)
if s == "" {
return ranges, nil
}
// Variants:
// 1 2 3 4
// 1-2 3-4
// 1-2 3
// 1 3-4
// 1 3-4
fields := strings.Split(s, " ")
for _, field := range fields {
field = strings.TrimSpace(field)
if field == "" {
continue
}
numbers := strings.Split(field, "-")
var r [2]int
first, err := strconv.Atoi(numbers[0])
if err != nil {
return ranges, err
}
first = first + startLine - 1
r[0] = first
if len(numbers) > 1 {
second, err := strconv.Atoi(numbers[1])
if err != nil {
return ranges, err
}
second = second + startLine - 1
r[1] = second
} else {
r[1] = first
}
ranges = append(ranges, r)
}
return ranges, nil
}
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