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Fix latex fragment parsing

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delimiters are not always 2 in length - $ being the exception. Also we have to
make sure to handle both $ and $$ delimiters.

Not proud of this solution but can't think of anything simpler right now - will
come back to this later hopefully.
This commit is contained in:
Niklas Fasching 2020-01-17 00:55:11 +01:00
parent f1361615ed
commit 115a8b9c1b
4 changed files with 18 additions and 7 deletions
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18
org/inline.go
View file

@ -66,6 +66,7 @@ var latexFragmentPairs = map[string]string{
`\(`: `\)`,
`\[`: `\]`,
`$$`: `$$`,
`$`: `$`,
}
func (d *Document) parseInline(input string) (nodes []Node) {
@ -88,7 +89,7 @@ func (d *Document) parseInline(input string) (nodes []Node) {
case '\\':
consumed, node = d.parseExplicitLineBreakOrLatexFragment(input, current)
case '$':
consumed, node = d.parseLatexFragment(input, current)
consumed, node = d.parseLatexFragment(input, current, 1)
case '\n':
consumed, node = d.parseLineBreak(input, current)
case ':':
@ -153,7 +154,7 @@ func (d *Document) parseExplicitLineBreakOrLatexFragment(input string, start int
}
}
case input[start+1] == '(' || input[start+1] == '[':
return d.parseLatexFragment(input, start)
return d.parseLatexFragment(input, start, 2)
case strings.Index(input[start:], `\begin{`) == 0:
if m := latexFragmentRegexp.FindStringSubmatch(input[start:]); m != nil {
if open, content, close := m[1], m[2], m[3]; open == close {
@ -166,15 +167,18 @@ func (d *Document) parseExplicitLineBreakOrLatexFragment(input string, start int
return 0, nil
}
func (d *Document) parseLatexFragment(input string, start int) (int, Node) {
func (d *Document) parseLatexFragment(input string, start int, pairLength int) (int, Node) {
if start+2 >= len(input) {
return 0, nil
}
openingPair := input[start : start+2]
if pairLength == 1 && input[start:start+2] == "$$" {
pairLength = 2
}
openingPair := input[start : start+pairLength]
closingPair := latexFragmentPairs[openingPair]
if i := strings.Index(input[start+2:], closingPair); i != -1 {
content := d.parseRawInline(input[start+2 : start+2+i])
return i + 2 + 2, LatexFragment{openingPair, closingPair, content}
if i := strings.Index(input[start+pairLength:], closingPair); i != -1 {
content := d.parseRawInline(input[start+pairLength : start+pairLength+i])
return i + pairLength + pairLength, LatexFragment{openingPair, closingPair, content}
}
return 0, nil
}