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-rw-r--r--src/inlines.c249
1 files changed, 112 insertions, 137 deletions
diff --git a/src/inlines.c b/src/inlines.c
index 71d75e9..e0c1441 100644
--- a/src/inlines.c
+++ b/src/inlines.c
@@ -10,16 +10,24 @@
#include "scanners.h"
#include "inlines.h"
+typedef struct InlineStack {
+ struct InlineStack *previous;
+ node_inl *first_inline;
+ int delim_count;
+ char delim_char;
+} inline_stack;
+
typedef struct Subject {
chunk input;
int pos;
int label_nestlevel;
reference_map *refmap;
+ inline_stack *last_emphasis;
} subject;
static node_inl *parse_chunk_inlines(chunk *chunk, reference_map *refmap);
static node_inl *parse_inlines_while(subject* subj, int (*f)(subject*));
-static int parse_inline(subject* subj, node_inl ** last);
+static int parse_inline(subject* subj, node_inl ** first, node_inl ** last);
static void subject_from_chunk(subject *e, chunk *chunk, reference_map *refmap);
static void subject_from_buf(subject *e, strbuf *buffer, reference_map *refmap);
@@ -158,6 +166,7 @@ static void subject_from_buf(subject *e, strbuf *buffer, reference_map *refmap)
e->pos = 0;
e->label_nestlevel = 0;
e->refmap = refmap;
+ e->last_emphasis = NULL;
chunk_rtrim(&e->input);
}
@@ -170,6 +179,7 @@ static void subject_from_chunk(subject *e, chunk *chunk, reference_map *refmap)
e->pos = 0;
e->label_nestlevel = 0;
e->refmap = refmap;
+ e->last_emphasis = NULL;
chunk_rtrim(&e->input);
}
@@ -262,12 +272,11 @@ static node_inl* handle_backticks(subject *subj)
}
// Scan ***, **, or * and return number scanned, or 0.
-// Don't advance position.
+// Advances position.
static int scan_delims(subject* subj, char c, bool * can_open, bool * can_close)
{
int numdelims = 0;
char char_before, char_after;
- int startpos = subj->pos;
char_before = subj->pos == 0 ? '\n' : peek_at(subj, subj->pos - 1);
while (peek_char(subj) == c) {
@@ -281,135 +290,93 @@ static int scan_delims(subject* subj, char c, bool * can_open, bool * can_close)
*can_open = *can_open && !isalnum(char_before);
*can_close = *can_close && !isalnum(char_after);
}
- subj->pos = startpos;
return numdelims;
}
// Parse strong/emph or a fallback.
// Assumes the subject has '_' or '*' at the current position.
-static node_inl* handle_strong_emph(subject* subj, char c)
+static node_inl* handle_strong_emph(subject* subj, char c, node_inl **last)
{
bool can_open, can_close;
- node_inl * result = NULL;
- node_inl ** last = malloc(sizeof(node_inl *));
- node_inl * new;
- node_inl * il;
- node_inl * first_head = NULL;
- node_inl * first_close = NULL;
- int first_close_delims = 0;
int numdelims;
+ int useDelims;
+ inline_stack * istack;
+ node_inl * inl;
+ node_inl * emph;
+ node_inl * inl_text;
+
+ numdelims = scan_delims(subj, c, &can_open, &can_close);
- *last = NULL;
+ if (can_close)
+ {
+ // walk the stack and find a matching opener, if there is one
+ istack = subj->last_emphasis;
+ while (true)
+ {
+ if (istack == NULL)
+ goto cannotClose;
- numdelims = scan_delims(subj, c, &can_open, &can_close);
- subj->pos += numdelims;
-
- new = make_str(chunk_dup(&subj->input, subj->pos - numdelims, numdelims));
- *last = new;
- first_head = new;
- result = new;
-
- if (!can_open || numdelims == 0) {
- goto done;
- }
-
- switch (numdelims) {
- case 1:
- while (true) {
- numdelims = scan_delims(subj, c, &can_open, &can_close);
- if (numdelims >= 1 && can_close) {
- subj->pos += 1;
- first_head->tag = INL_EMPH;
- chunk_free(&first_head->content.literal);
- first_head->content.inlines = first_head->next;
- first_head->next = NULL;
- goto done;
- } else {
- if (!parse_inline(subj, last)) {
- goto done;
- }
- }
- }
- break;
- case 2:
- while (true) {
- numdelims = scan_delims(subj, c, &can_open, &can_close);
- if (numdelims >= 2 && can_close) {
- subj->pos += 2;
- first_head->tag = INL_STRONG;
- chunk_free(&first_head->content.literal);
- first_head->content.inlines = first_head->next;
- first_head->next = NULL;
- goto done;
- } else {
- if (!parse_inline(subj, last)) {
- goto done;
- }
- }
- }
- break;
- case 3:
- while (true) {
- numdelims = scan_delims(subj, c, &can_open, &can_close);
- if (can_close && numdelims >= 1 && numdelims <= 3 &&
- numdelims != first_close_delims) {
- new = make_str(chunk_dup(&subj->input, subj->pos, numdelims));
- append_inlines(*last, new);
- *last = new;
- if (first_close_delims == 1 && numdelims > 2) {
- numdelims = 2;
- } else if (first_close_delims == 2) {
- numdelims = 1;
- } else if (numdelims == 3) {
- // If we opened with ***, we interpret it as ** followed by *
- // giving us <strong><em>
- numdelims = 1;
- }
- subj->pos += numdelims;
- if (first_close) {
- first_head->tag = first_close_delims == 1 ? INL_STRONG : INL_EMPH;
- chunk_free(&first_head->content.literal);
- first_head->content.inlines =
- make_inlines(first_close_delims == 1 ? INL_EMPH : INL_STRONG,
- first_head->next);
-
- il = first_head->next;
- while (il->next && il->next != first_close) {
- il = il->next;
- }
- il->next = NULL;
-
- first_head->content.inlines->next = first_close->next;
-
- il = first_head->content.inlines;
- while (il->next && il->next != *last) {
- il = il->next;
- }
- il->next = NULL;
- free_inlines(*last);
-
- first_close->next = NULL;
- free_inlines(first_close);
- first_head->next = NULL;
- goto done;
- } else {
- first_close = *last;
- first_close_delims = numdelims;
- }
- } else {
- if (!parse_inline(subj, last)) {
- goto done;
- }
- }
- }
- break;
- default:
- goto done;
+ if (istack->delim_char == c)
+ break;
+
+ istack = istack->previous;
+ }
+
+ // calculate the actual number of delimeters used from this closer
+ useDelims = istack->delim_count;
+ if (useDelims == 3) useDelims = numdelims == 3 ? 1 : numdelims;
+ else if (useDelims > numdelims) useDelims = 1;
+
+ if (istack->delim_count == useDelims)
+ {
+ // the opener is completely used up - remove the stack entry and reuse the inline element
+ inl = istack->first_inline;
+ inl->tag = useDelims == 1 ? INL_EMPH : INL_STRONG;
+ chunk_free(&inl->content.literal);
+ inl->content.inlines = inl->next;
+ inl->next = NULL;
+
+ subj->last_emphasis = istack->previous;
+ istack->previous = NULL;
+ *last = inl;
+ free(istack);
+ }
+ else
+ {
+ // the opener will only partially be used - stack entry remains (truncated) and a new inline is added.
+ inl = istack->first_inline;
+ istack->delim_count -= useDelims;
+ inl->content.literal.len = istack->delim_count;
+
+ emph = useDelims == 1 ? make_emph(inl->next) : make_strong(inl->next);
+ inl->next = emph;
+ *last = emph;
+ }
+
+ // if the closer was not fully used, move back a char or two and try again.
+ if (useDelims < numdelims)
+ {
+ subj->pos = subj->pos - numdelims + useDelims;
+ return handle_strong_emph(subj, c, last);
+ }
+
+ return make_str(chunk_literal(""));
}
-done:
- free(last);
- return result;
+cannotClose:
+ inl_text = make_str(chunk_dup(&subj->input, subj->pos - numdelims, numdelims));
+
+ if (can_open)
+ {
+ istack = (inline_stack*)malloc(sizeof(inline_stack));
+ istack->delim_count = numdelims;
+ istack->delim_char = c;
+ istack->first_inline = inl_text;
+ istack->previous = subj->last_emphasis;
+ subj->last_emphasis = istack;
+ }
+
+ return inl_text;
}
// Parse backslash-escape or just a backslash, returning an inline.
@@ -753,9 +720,19 @@ inline static int not_eof(subject* subj)
extern node_inl* parse_inlines_while(subject* subj, int (*f)(subject*))
{
node_inl* result = NULL;
- node_inl** last = &result;
- while ((*f)(subj) && parse_inline(subj, last)) {
- }
+ node_inl** first = &result;
+ node_inl* last = NULL;
+ while ((*f)(subj) && parse_inline(subj, first, &last)) {
+ }
+
+ inline_stack* istack = subj->last_emphasis;
+ inline_stack* temp;
+ while (istack != NULL) {
+ temp = istack->previous;
+ free(istack);
+ istack = temp;
+ }
+
return result;
}
@@ -801,7 +778,7 @@ static int subject_find_special_char(subject *subj)
// Parse an inline, advancing subject, and add it to last element.
// Adjust tail to point to new last element of list.
// Return 0 if no inline can be parsed, 1 otherwise.
-static int parse_inline(subject* subj, node_inl ** last)
+static int parse_inline(subject* subj, node_inl ** first, node_inl ** last)
{
node_inl* new = NULL;
chunk contents;
@@ -828,19 +805,10 @@ static int parse_inline(subject* subj, node_inl ** last)
new = handle_pointy_brace(subj);
break;
case '_':
- if (subj->pos > 0) {
- unsigned char prev = peek_at(subj, subj->pos - 1);
- if (isalnum(prev) || prev == '_') {
- new = make_str(chunk_literal("_"));
- advance(subj);
- break;
- }
- }
-
- new = handle_strong_emph(subj, '_');
+ new = handle_strong_emph(subj, '_', last);
break;
case '*':
- new = handle_strong_emph(subj, '*');
+ new = handle_strong_emph(subj, '*', last);
break;
case '[':
new = handle_left_bracket(subj);
@@ -870,11 +838,18 @@ static int parse_inline(subject* subj, node_inl ** last)
new = make_str(contents);
}
- if (*last == NULL) {
+ if (*first == NULL) {
+ *first = new;
*last = new;
} else {
- append_inlines(*last, new);
+ append_inlines(*first, new);
+ }
+
+ while (new->next) {
+ new = new->next;
}
+ *last = new;
+
return 1;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 10:29:20 +0000