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MathJax support and bug fix #15

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MathJax support and bug fix #15

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69ac6d0
MathJax support and bug fix
clark800 Oct 29, 2023
5588679
Add math build mode
clark800 Nov 8, 2023
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5 changes: 4 additions & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -17,14 +17,17 @@ options:

.c.o:
@echo CC $<
@${CC} -c ${CFLAGS} $<
@${CC} -c ${CPPFLAGS} ${CFLAGS} $<

${OBJ}: config.mk

smu: ${OBJ}
@echo LD $@
@${CC} -o $@ ${OBJ} ${LDFLAGS}

math: CPPFLAGS += -DDISPLAY_MATH_DELIMITER='$$$$' -DINLINE_MATH_DELIMITER='$$'
math: options smu

clean:
@echo cleaning
@rm -f smu ${OBJ} ${LIBOBJ} smu-${VERSION}.tar.gz
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3 changes: 3 additions & 0 deletions README
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Expand Up @@ -248,6 +248,9 @@ Other interesting stuff
But here is
one.

* If built with `make math`, text wrapped in `$` or `$$` is not processed
so it can be used with MathJax

embed HTML
----------

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16 changes: 14 additions & 2 deletions smu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,11 @@
#define LENGTH(x) sizeof(x)/sizeof(x[0])
#define ADDC(b,i) if (i % BUFSIZ == 0) { b = realloc(b, (i + BUFSIZ) * sizeof(char)); if (!b) eprint("Malloc failed."); } b[i]

#define QUOTE(x) #x
#define EXPAND_AND_QUOTE(x) QUOTE(x)
#define DISPLAY_MATH EXPAND_AND_QUOTE(DISPLAY_MATH_DELIMITER)
#define INLINE_MATH EXPAND_AND_QUOTE(INLINE_MATH_DELIMITER)

typedef int (*Parser)(const char *, const char *, int);
typedef struct {
char *search;
Expand Down Expand Up @@ -70,6 +75,8 @@ static Tag surround[] = {
{ "```", 0, "<code>", "</code>" },
{ "``", 0, "<code>", "</code>" },
{ "`", 0, "<code>", "</code>" },
{ DISPLAY_MATH, 0, "\\[", "\\]" },
{ INLINE_MATH, 0, "\\(", "\\)" },
{ "___", 1, "<strong><em>", "</em></strong>" },
{ "***", 1, "<strong><em>", "</em></strong>" },
{ "__", 1, "<strong>", "</strong>" },
Expand Down Expand Up @@ -645,7 +652,7 @@ dosurround(const char *begin, const char *end, int newblock) {

for (i = 0; i < LENGTH(surround); i++) {
l = strlen(surround[i].search);
if (end - begin < 2*l || strncmp(begin, surround[i].search, l) != 0)
if (l == 0 || end - begin < 2*l || strncmp(begin, surround[i].search, l) != 0)
continue;
start = begin + l;
p = start;
Expand All @@ -655,8 +662,13 @@ dosurround(const char *begin, const char *end, int newblock) {
} while (p && p[-1] == '\\');
if (p && p[-1] != '\\')
stop = p;
if (!stop || stop < start || stop >= end)
if (!stop || stop <= start || stop >= end)
continue;
if (strcmp(surround[i].search, INLINE_MATH) == 0) {
/* not inline math if span starts or ends with space or contains newline */
if (isspace(start[0]) || isspace(stop[-1]) || strchr(start, '\n') < stop)
continue;
}
fputs(surround[i].before, stdout);

/* Single space at start and end are ignored */
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