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Inline image support

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This commit is contained in:
Nate Choe
2022-05-01 04:03:18 -05:00
parent 0b134cabb2
commit 4e70c61ae5
1 changed files with 68 additions and 27 deletions
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95
src/inlines.c
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@@ -17,6 +17,11 @@ struct escape escapes[] = {
static int writecodespan(char *data, int i, size_t len, FILE *out);
static int writelink(char *data, int i, size_t len, FILE *out);
static int writeimage(char *data, int i, size_t len, FILE *out);
static int getlinkinfo(char *data, int i, size_t len,
int *textstart, int *textend,
int *titlestart, int *titleend,
int *linkstart, int *linkend);
static void writeescaped(char *data, size_t len, FILE *out);
static void writechescape(char c, FILE *out);
@@ -32,6 +37,8 @@ void writedata(char *data, size_t len, FILE *out) {
goto special;
if ((newi = writelink(data, i, len, out)) >= 0)
goto special;
if ((newi = writeimage(data, i, len, out)) >= 0)
goto special;
if (data[i] == '\\') {
if (strchr(punctuation, data[i + 1]) == NULL)
writechescape('\\', out);
@@ -76,6 +83,52 @@ static int writecodespan(char *data, int i, size_t len, FILE *out) {
static int writelink(char *data, int i, size_t len, FILE *out) {
int textstart, textend, titlestart, titleend, linkstart, linkend;
i = getlinkinfo(data, i, len, &textstart, &textend,
&titlestart, &titleend,
&linkstart, &linkend);
if (i < 0)
return -1;
fputs("<a href='", out);
writeescaped(data + linkstart, linkend - linkstart, out);
fputc('\'', out);
if (titlestart >= 0) {
fputs(" title='", out);
writeescaped(data + titlestart, titleend - titlestart, out);
fputc('\'', out);
}
fputc('>', out);
writeescaped(data + textstart, textend - textstart, out);
fputs("</a>", out);
return i;
}
static int writeimage(char *data, int i, size_t len, FILE *out) {
int textstart, textend, titlestart, titleend, linkstart, linkend;
if (data[i++] != '!')
return -1;
i = getlinkinfo(data, i, len, &textstart, &textend,
&titlestart, &titleend,
&linkstart, &linkend);
if (i < 0)
return -1;
fputs("<img src='", out);
writeescaped(data + linkstart, linkend - linkstart, out);
fputc('\'', out);
if (titlestart >= 0) {
fputs(" title='", out);
writeescaped(data + titlestart, titleend - titlestart, out);
fputc('\'', out);
}
fputs(" alt='", out);
writeescaped(data + textstart, textend - textstart, out);
fputs("'>", out);
return i;
}
static int getlinkinfo(char *data, int i, size_t len,
int *textstart, int *textend,
int *titlestart, int *titleend,
int *linkstart, int *linkend) {
int count;
enum {
INITIAL,
@@ -99,7 +152,7 @@ static int writelink(char *data, int i, size_t len, FILE *out) {
return -1;
state = GETTEXT;
count = 1;
textstart = i + 1;
*textstart = i + 1;
break;
case GETTEXT:
if (data[i] == '[')
@@ -107,8 +160,8 @@ static int writelink(char *data, int i, size_t len, FILE *out) {
if (data[i] == ']')
--count;
if (count == 0) {
textend = i;
linkstart = i;
*textend = i;
*linkstart = i;
state = GETDESTSTART;
}
break;
@@ -120,11 +173,11 @@ static int writelink(char *data, int i, size_t len, FILE *out) {
case GETDESTDETERMINE:
if (data[i] == '<') {
state = GETDESTPOINTY;
linkstart = i + 1;
*linkstart = i + 1;
}
else {
state = GETDESTNORMAL;
linkstart = i--;
*linkstart = i--;
count = 0;
}
break;
@@ -132,7 +185,7 @@ static int writelink(char *data, int i, size_t len, FILE *out) {
if (data[i] == '<' && data[i - 1] != '\\')
return -1;
if (data[i] == '>' && data[i - 1] != '\\') {
linkend = i;
*linkend = i;
state = GETTITLEDETERMINE;
}
break;
@@ -143,53 +196,53 @@ static int writelink(char *data, int i, size_t len, FILE *out) {
--count;
if (count < 0) {
state = GETTITLEDETERMINE;
linkend = i--;
*linkend = i--;
break;
}
if (count != 0)
break;
if (isctrl(data[i]) || data[i] == ' ') {
state = GETTITLEDETERMINE;
linkend = i;
*linkend = i;
}
break;
case GETTITLEDETERMINE:
switch (data[i]) {
case '"':
state = GETTITLEDOUBLEQUOTE;
titlestart = i + 1;
*titlestart = i + 1;
break;
case '\'':
state = GETTITLESINGLEQUOTE;
titlestart = i + 1;
*titlestart = i + 1;
break;
case '(':
state = GETTITLEPAREN;
count = 1;
titlestart = i + 1;
*titlestart = i + 1;
break;
default:
--i;
titlestart = titleend = -1;
*titlestart = *titleend = -1;
state = NEARLYTHERE;
}
break;
case GETTITLEDOUBLEQUOTE:
if (data[i] == '"' && data[i - 1] != '\\') {
titleend = i;
*titleend = i;
state = NEARLYTHERE;
}
break;
case GETTITLESINGLEQUOTE:
if (data[i] == '\'' && data[i - 1] != '\\') {
titleend = i;
*titleend = i;
state = NEARLYTHERE;
}
break;
case GETTITLEPAREN:
if (data[i] == '(' || data[i] == ')') {
if (data[i - 1] != '\\') {
titleend = i;
*titleend = i;
state = NEARLYTHERE;
}
}
@@ -206,18 +259,6 @@ static int writelink(char *data, int i, size_t len, FILE *out) {
done:
if (state != DONE)
return -1;
fputs("<a", out);
fputs(" href='", out);
writeescaped(data + linkstart, linkend - linkstart, out);
fputc('\'', out);
if (titlestart >= 0) {
fputs(" title='", out);
writeescaped(data + titlestart, titleend - titlestart, out);
fputc('\'', out);
}
fputc('>', out);
writeescaped(data + textstart, textend - textstart, out);
fputs("</a>", out);
return i;
}