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Fixes #27605: inline math blocks can't be preceeded/followed by alphanumerical characters (#30175) (#30250)
Backport #30175 by @jmlt2002 - Inline math blocks couldn't be preceeded or succeeded by alphanumerical characters due to changes introduced in PR #21171. Removed the condition that caused this (precedingCharacter condition) and added a new exit condition of the for-loop that checks if a specific '$' was escaped using '\' so that the math expression can be rendered as intended. - Additionally this PR fixes another bug where math blocks of the type '$xyz$abc$' where the dollar sign was not escaped by the user, generated an error (shown in the screenshots below) - Altered the tests to accomodate for the changes Former behaviour (from try.gitea.io): ![image](https://github.com/go-gitea/gitea/assets/114936010/8f0cbb21-321d-451c-b871-c67a8e1e9235) Fixed behaviour (from my local build): ![image](https://github.com/go-gitea/gitea/assets/114936010/5c22687c-6f11-4407-b5e7-c14b838bc20d) (Edit) Source code for the README.md file: ``` $x$ -$x$ $x$- a$xa$ $xa$a 1$xb$ $xb$1 $a a$b b$ a$b $a a$b b$ $a a\$b b$ ``` Signed-off-by: João Tiago <joao.leal.tintas@tecnico.ulisboa.pt> Co-authored-by: João Tiago <114936010+jmlt2002@users.noreply.github.com> (cherry picked from commit 5123ed31914f704348c0660468a3707011f5a160)
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4ed431531b
commit
0d3f446460
2 changed files with 31 additions and 7 deletions
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@ -509,9 +509,17 @@ func TestMathBlock(t *testing.T) {
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`\(a\) \(b\)`,
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`<p><code class="language-math is-loading">a</code> <code class="language-math is-loading">b</code></p>` + nl,
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},
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{
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`$a$.`,
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`<p><code class="language-math is-loading">a</code>.</p>` + nl,
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},
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{
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`.$a$`,
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`<p>.$a$</p>` + nl,
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},
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{
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`$a a$b b$`,
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`<p><code class="language-math is-loading">a a$b b</code></p>` + nl,
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`<p>$a a$b b$</p>` + nl,
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},
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{
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`a a$b b`,
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@ -519,7 +527,15 @@ func TestMathBlock(t *testing.T) {
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},
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{
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`a$b $a a$b b$`,
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`<p>a$b <code class="language-math is-loading">a a$b b</code></p>` + nl,
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`<p>a$b $a a$b b$</p>` + nl,
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},
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{
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"a$x$",
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`<p>a$x$</p>` + nl,
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},
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{
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"$x$a",
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`<p>$x$a</p>` + nl,
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},
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{
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"$$a$$",
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@ -41,9 +41,12 @@ func (parser *inlineParser) Trigger() []byte {
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return parser.start[0:1]
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}
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func isPunctuation(b byte) bool {
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return b == '.' || b == '!' || b == '?' || b == ',' || b == ';' || b == ':'
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}
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func isAlphanumeric(b byte) bool {
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// Github only cares about 0-9A-Za-z
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return (b >= '0' && b <= '9') || (b >= 'A' && b <= 'Z') || (b >= 'a' && b <= 'z')
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return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || (b >= '0' && b <= '9')
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}
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// Parse parses the current line and returns a result of parsing.
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@ -56,7 +59,7 @@ func (parser *inlineParser) Parse(parent ast.Node, block text.Reader, pc parser.
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}
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precedingCharacter := block.PrecendingCharacter()
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if precedingCharacter < 256 && isAlphanumeric(byte(precedingCharacter)) {
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if precedingCharacter < 256 && (isAlphanumeric(byte(precedingCharacter)) || isPunctuation(byte(precedingCharacter))) {
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// need to exclude things like `a$` from being considered a start
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return nil
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}
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@ -75,14 +78,19 @@ func (parser *inlineParser) Parse(parent ast.Node, block text.Reader, pc parser.
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ender += pos
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// Now we want to check the character at the end of our parser section
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// that is ender + len(parser.end)
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// that is ender + len(parser.end) and check if char before ender is '\'
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pos = ender + len(parser.end)
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if len(line) <= pos {
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break
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}
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if !isAlphanumeric(line[pos]) {
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suceedingCharacter := line[pos]
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if !isPunctuation(suceedingCharacter) && !(suceedingCharacter == ' ') {
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return nil
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}
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if line[ender-1] != '\\' {
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break
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}
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// move the pointer onwards
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ender += len(parser.end)
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}
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