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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package markdown
import (
"strings"
)
type FencedCodeLine struct {
Indentation int
Range Range
}
type FencedCode struct {
blockBase
markdown string
didSeeClosingFence bool
Indentation int
OpeningFence Range
RawInfo Range
RawCode []FencedCodeLine
}
func (b *FencedCode) Code() (result string) {
for _, code := range b.RawCode {
result += strings.Repeat(" ", code.Indentation) + b.markdown[code.Range.Position:code.Range.End]
}
return
}
func (b *FencedCode) Info() string {
return Unescape(b.markdown[b.RawInfo.Position:b.RawInfo.End])
}
func (b *FencedCode) Continuation(indentation int, r Range) *continuation {
if b.didSeeClosingFence {
return nil
}
return &continuation{
Indentation: indentation,
Remaining: r,
}
}
func (b *FencedCode) AddLine(indentation int, r Range) bool {
s := b.markdown[r.Position:r.End]
if indentation <= 3 && strings.HasPrefix(s, b.markdown[b.OpeningFence.Position:b.OpeningFence.End]) {
suffix := strings.TrimSpace(s[b.OpeningFence.End-b.OpeningFence.Position:])
isClosingFence := true
for _, c := range suffix {
if c != rune(s[0]) {
isClosingFence = false
break
}
}
if isClosingFence {
b.didSeeClosingFence = true
return true
}
}
if indentation >= b.Indentation {
indentation -= b.Indentation
} else {
indentation = 0
}
b.RawCode = append(b.RawCode, FencedCodeLine{
Indentation: indentation,
Range: r,
})
return true
}
func (b *FencedCode) AllowsBlockStarts() bool {
return false
}
func fencedCodeStart(markdown string, indentation int, r Range, matchedBlocks, unmatchedBlocks []Block) []Block {
s := markdown[r.Position:r.End]
if !strings.HasPrefix(s, "```") && !strings.HasPrefix(s, "~~~") {
return nil
}
fenceCharacter := rune(s[0])
fenceLength := 3
for _, c := range s[3:] {
if c == fenceCharacter {
fenceLength++
} else {
break
}
}
for i := r.Position + fenceLength; i < r.End; i++ {
if markdown[i] == '`' {
return nil
}
}
return []Block{
&FencedCode{
markdown: markdown,
Indentation: indentation,
RawInfo: trimRightSpace(markdown, Range{r.Position + fenceLength, r.End}),
OpeningFence: Range{r.Position, r.Position + fenceLength},
},
}
}
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