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package escape
func IsAtxHeader(chars []byte, index int) int {
if chars[index] != '#' {
return -1
}
for i := index - 1; i >= 0; i-- {
if chars[i] == '\n' {
break
}
if chars[i] == placeholderByte {
continue
}
if chars[i] == ' ' {
continue
}
return -1
}
nPoundSigns := 1
for i := index + 1; i < len(chars); i++ {
if chars[i] == '#' {
nPoundSigns++
if nPoundSigns > 6 {
return -1
}
continue
}
if chars[i] == placeholderByte {
continue
}
if chars[i] == ' ' || chars[i] == '\t' || chars[i] == '\n' || chars[i] == '\r' {
// TODO: fix calculation with placeholder (maybe own for loop construct?)
// Returns the count of # that we encountered
return i - index
}
return -1
}
return 1
}
func IsSetextHeader(chars []byte, index int) int {
if chars[index] != '=' && chars[index] != '-' {
return -1
}
var newlineCount int
for i := index - 1; i >= 0; i-- {
if chars[i] == placeholderByte || chars[i] == ' ' {
continue
}
if chars[i] == '\n' {
newlineCount++
continue
}
if newlineCount == 0 {
// Without any newlines, this character is on the same line
// as the delimiter. So the delimiter is inside a normal text...
return -1
} else if newlineCount == 1 {
// The heading content is on the line above the delimiter
// which qualifies for a setext heading...
return 1
} else {
return -1
}
}
return -1
}
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