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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package math
import (
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/util"
)
// Extension is a math extension
type Extension struct {
enabled bool
parseDollarInline bool
parseDollarBlock bool
}
// Option is the interface Options should implement
type Option interface {
SetOption(e *Extension)
}
type extensionFunc func(e *Extension)
func (fn extensionFunc) SetOption(e *Extension) {
fn(e)
}
// Enabled enables or disables this extension
func Enabled(enable ...bool) Option {
value := true
if len(enable) > 0 {
value = enable[0]
}
return extensionFunc(func(e *Extension) {
e.enabled = value
})
}
// WithInlineDollarParser enables or disables the parsing of $...$
func WithInlineDollarParser(enable ...bool) Option {
value := true
if len(enable) > 0 {
value = enable[0]
}
return extensionFunc(func(e *Extension) {
e.parseDollarInline = value
})
}
// WithBlockDollarParser enables or disables the parsing of $$...$$
func WithBlockDollarParser(enable ...bool) Option {
value := true
if len(enable) > 0 {
value = enable[0]
}
return extensionFunc(func(e *Extension) {
e.parseDollarBlock = value
})
}
// Math represents a math extension with default rendered delimiters
var Math = &Extension{
enabled: true,
parseDollarBlock: true,
parseDollarInline: true,
}
// NewExtension creates a new math extension with the provided options
func NewExtension(opts ...Option) *Extension {
r := &Extension{
enabled: true,
parseDollarBlock: true,
parseDollarInline: true,
}
for _, o := range opts {
o.SetOption(r)
}
return r
}
// Extend extends goldmark with our parsers and renderers
func (e *Extension) Extend(m goldmark.Markdown) {
if !e.enabled {
return
}
m.Parser().AddOptions(parser.WithBlockParsers(
util.Prioritized(NewBlockParser(e.parseDollarBlock), 701),
))
inlines := []util.PrioritizedValue{
util.Prioritized(NewInlineBracketParser(), 501),
}
if e.parseDollarInline {
inlines = append(inlines, util.Prioritized(NewInlineDollarParser(), 503),
util.Prioritized(NewInlineDualDollarParser(), 502))
}
m.Parser().AddOptions(parser.WithInlineParsers(inlines...))
m.Renderer().AddOptions(renderer.WithNodeRenderers(
util.Prioritized(NewBlockRenderer(), 501),
util.Prioritized(NewInlineRenderer(), 502),
))
}
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