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authorNick Wellnhofer <wellnhofer@aevum.de>2014-11-29 20:42:10 +0100
committerNick Wellnhofer <wellnhofer@aevum.de>2014-11-30 16:05:34 +0100
commit7cff0f390703306060d1db9852063b67d6707303 (patch)
treee644bddb62405edfb56331e6f84ad65166dcb172
parenta17f54ca246ed607f02c165b916b17aa0be03492 (diff)
Rename delimiter_stack to delimiter
The struct actually describes a delimiter. I also find it conceptually much clearer to think of a doubly linked list of delimiters than a stack.
-rw-r--r--src/inlines.c158
1 files changed, 79 insertions, 79 deletions
diff --git a/src/inlines.c b/src/inlines.c
index 0dcfd72..7688758 100644
--- a/src/inlines.c
+++ b/src/inlines.c
@@ -23,26 +23,26 @@
#define make_emph() make_simple(CMARK_NODE_EMPH)
#define make_strong() make_simple(CMARK_NODE_STRONG)
-typedef struct DelimiterStack {
- struct DelimiterStack *previous;
- struct DelimiterStack *next;
+typedef struct delimiter {
+ struct delimiter *previous;
+ struct delimiter *next;
cmark_node *first_inline;
int delim_count;
unsigned char delim_char;
int position;
bool can_open;
bool can_close;
-} delimiter_stack;
+} delimiter;
-typedef struct Subject {
+typedef struct {
chunk input;
int pos;
cmark_reference_map *refmap;
- delimiter_stack *delimiters;
+ delimiter *last_delim;
} subject;
-static delimiter_stack*
-S_insert_emph(subject *subj, delimiter_stack *opener, delimiter_stack *closer);
+static delimiter*
+S_insert_emph(subject *subj, delimiter *opener, delimiter *closer);
static int parse_inline(subject* subj, cmark_node * parent);
@@ -148,7 +148,7 @@ static void subject_from_buf(subject *e, strbuf *buffer,
e->input.alloc = 0;
e->pos = 0;
e->refmap = refmap;
- e->delimiters = NULL;
+ e->last_delim = NULL;
chunk_rtrim(&e->input);
}
@@ -265,62 +265,62 @@ static int scan_delims(subject* subj, unsigned char c, bool * can_open, bool * c
/*
static void print_delimiters(subject *subj)
{
- delimiter_stack *tempstack;
- tempstack = subj->delimiters;
- while (tempstack != NULL) {
+ delimiter *delim;
+ delim = subj->last_delim;
+ while (delim != NULL) {
printf("Item at %p: %d %d %d %d next(%p) prev(%p)\n",
- tempstack, tempstack->delim_count, tempstack->delim_char,
- tempstack->can_open, tempstack->can_close,
- tempstack->next, tempstack->previous);
- tempstack = tempstack->previous;
+ delim, delim->delim_count, delim->delim_char,
+ delim->can_open, delim->can_close,
+ delim->next, delim->previous);
+ delim = delim->previous;
}
}
*/
-static void remove_delimiter(subject *subj, delimiter_stack *stack)
+static void remove_delimiter(subject *subj, delimiter *delim)
{
- if (stack == NULL) return;
- if (stack->next == NULL) {
- // top of stack:
- assert(stack == subj->delimiters);
- if (stack->previous != NULL) {
- stack->previous->next = NULL;
+ if (delim == NULL) return;
+ if (delim->next == NULL) {
+ // end of list:
+ assert(delim == subj->last_delim);
+ if (delim->previous != NULL) {
+ delim->previous->next = NULL;
}
- subj->delimiters = stack->previous;
- } else if (stack->previous == NULL) {
- // bottom of stack, with something above it
- stack->next->previous = NULL;
- } else { // neither top nor bottom:
- stack->previous->next = stack->next;
- stack->next->previous = stack->previous;
+ subj->last_delim = delim->previous;
+ } else if (delim->previous == NULL) {
+ // start of list, with something after it
+ delim->next->previous = NULL;
+ } else { // neither start nor end:
+ delim->previous->next = delim->next;
+ delim->next->previous = delim->previous;
}
- free(stack);
+ free(delim);
}
-static delimiter_stack * push_delimiter(subject *subj,
+static delimiter * push_delimiter(subject *subj,
int numdelims,
unsigned char c,
bool can_open,
bool can_close,
cmark_node *inl_text)
{
- delimiter_stack *istack =
- (delimiter_stack*)malloc(sizeof(delimiter_stack));
- if (istack == NULL) {
+ delimiter *delim =
+ (delimiter*)malloc(sizeof(delimiter));
+ if (delim == NULL) {
return NULL;
}
- istack->delim_count = numdelims;
- istack->delim_char = c;
- istack->can_open = can_open;
- istack->can_close = can_close;
- istack->first_inline = inl_text;
- istack->previous = subj->delimiters;
- istack->next = NULL;
- if (istack->previous != NULL) {
- istack->previous->next = istack;
+ delim->delim_count = numdelims;
+ delim->delim_char = c;
+ delim->can_open = can_open;
+ delim->can_close = can_close;
+ delim->first_inline = inl_text;
+ delim->previous = subj->last_delim;
+ delim->next = NULL;
+ if (delim->previous != NULL) {
+ delim->previous->next = delim;
}
- istack->position = subj->pos;
- return istack;
+ delim->position = subj->pos;
+ return delim;
}
// Parse strong/emph or a fallback.
@@ -336,20 +336,20 @@ static cmark_node* handle_strong_emph(subject* subj, unsigned char c)
inl_text = make_str(chunk_dup(&subj->input, subj->pos - numdelims, numdelims));
if (can_open || can_close) {
- subj->delimiters = push_delimiter(subj, numdelims, c, can_open, can_close,
+ subj->last_delim = push_delimiter(subj, numdelims, c, can_open, can_close,
inl_text);
}
return inl_text;
}
-static void process_emphasis(subject *subj, delimiter_stack *stack_bottom)
+static void process_emphasis(subject *subj, delimiter *start_delim)
{
- delimiter_stack *closer = subj->delimiters;
- delimiter_stack *opener;
+ delimiter *closer = subj->last_delim;
+ delimiter *opener;
// move back to first relevant delim.
- while (closer != NULL && closer->previous != stack_bottom) {
+ while (closer != NULL && closer->previous != start_delim) {
closer = closer->previous;
}
@@ -359,14 +359,14 @@ static void process_emphasis(subject *subj, delimiter_stack *stack_bottom)
(closer->delim_char == '*' || closer->delim_char == '_')) {
// Now look backwards for first matching opener:
opener = closer->previous;
- while (opener != NULL && opener != stack_bottom) {
+ while (opener != NULL && opener != start_delim) {
if (opener->delim_char == closer->delim_char &&
opener->can_open) {
break;
}
opener = opener->previous;
}
- if (opener != NULL && opener != stack_bottom) {
+ if (opener != NULL && opener != start_delim) {
closer = S_insert_emph(subj, opener, closer);
} else {
closer = closer->next;
@@ -375,16 +375,16 @@ static void process_emphasis(subject *subj, delimiter_stack *stack_bottom)
closer = closer->next;
}
}
- // free all delimiters in stack down to stack_bottom:
- while (subj->delimiters != stack_bottom) {
- remove_delimiter(subj, subj->delimiters);
+ // free all delimiters in list until start_delim:
+ while (subj->last_delim != start_delim) {
+ remove_delimiter(subj, subj->last_delim);
}
}
-static delimiter_stack*
-S_insert_emph(subject *subj, delimiter_stack *opener, delimiter_stack *closer)
+static delimiter*
+S_insert_emph(subject *subj, delimiter *opener, delimiter *closer)
{
- delimiter_stack *tempstack, *nextstack;
+ delimiter *delim, *tmp_delim;
int use_delims;
cmark_node *opener_inl = opener->first_inline;
cmark_node *closer_inl = closer->first_inline;
@@ -398,18 +398,18 @@ S_insert_emph(subject *subj, delimiter_stack *opener, delimiter_stack *closer)
use_delims = closer->delim_count % 2 == 0 ? 2 : 1;
}
- // remove used delimiters from stack elements and associated inlines.
+ // remove used characters from delimiters and associated inlines.
opener->delim_count -= use_delims;
closer->delim_count -= use_delims;
opener_inl->as.literal.len = opener->delim_count;
closer_inl->as.literal.len = closer->delim_count;
// free delimiters between opener and closer
- tempstack = closer->previous;
- while (tempstack != NULL && tempstack != opener) {
- nextstack = tempstack->previous;
- remove_delimiter(subj, tempstack);
- tempstack = nextstack;
+ delim = closer->previous;
+ while (delim != NULL && delim != opener) {
+ tmp_delim = delim->previous;
+ remove_delimiter(subj, delim);
+ delim = tmp_delim;
}
first_child = opener_inl->next;
@@ -421,7 +421,7 @@ S_insert_emph(subject *subj, delimiter_stack *opener, delimiter_stack *closer)
chunk_free(&(opener_inl->as.literal));
emph = opener_inl;
emph->type = use_delims == 1 ? NODE_EMPH : NODE_STRONG;
- // remove opener from stack
+ // remove opener from list
remove_delimiter(subj, opener);
}
else {
@@ -450,10 +450,10 @@ S_insert_emph(subject *subj, delimiter_stack *opener, delimiter_stack *closer)
if (closer->delim_count == 0) {
// remove empty closer inline
cmark_node_free(closer_inl);
- // remove closer from stack
- tempstack = closer->next;
+ // remove closer from list
+ tmp_delim = closer->next;
remove_delimiter(subj, closer);
- closer = tempstack;
+ closer = tmp_delim;
}
return closer;
@@ -656,8 +656,8 @@ static cmark_node* handle_close_bracket(subject* subj, cmark_node *parent)
bool is_image = false;
chunk urlchunk, titlechunk;
unsigned char *url, *title;
- delimiter_stack *opener;
- delimiter_stack *tempstack;
+ delimiter *opener;
+ delimiter *tmp_delim;
cmark_node *link_text;
cmark_node *inl;
chunk raw_label;
@@ -666,8 +666,8 @@ static cmark_node* handle_close_bracket(subject* subj, cmark_node *parent)
advance(subj); // advance past ]
initial_pos = subj->pos;
- // look through stack of delimiters for a [ or !
- opener = subj->delimiters;
+ // look through list of delimiters for a [ or !
+ opener = subj->last_delim;
while (opener) {
if (opener->delim_char == '[' || opener->delim_char == '!') {
break;
@@ -747,7 +747,7 @@ static cmark_node* handle_close_bracket(subject* subj, cmark_node *parent)
noMatch:
// If we fall through to here, it means we didn't match a link:
- remove_delimiter(subj, opener); // remove this opener from delimiter stack
+ remove_delimiter(subj, opener); // remove this opener from delimiter list
subj->pos = initial_pos;
return make_str(chunk_literal("]"));
@@ -776,13 +776,13 @@ match:
// delimiters. (This code can be removed if we decide to allow links
// inside links.)
if (!is_image) {
- opener = subj->delimiters;
+ opener = subj->last_delim;
while (opener != NULL) {
- tempstack = opener->previous;
+ tmp_delim = opener->previous;
if (opener->delim_char == '[') {
remove_delimiter(subj, opener);
}
- opener = tempstack;
+ opener = tmp_delim;
}
}
@@ -876,7 +876,7 @@ static int parse_inline(subject* subj, cmark_node * parent)
case '[':
advance(subj);
new_inl = make_str(chunk_literal("["));
- subj->delimiters = push_delimiter(subj, 1, '[', true, false, new_inl);
+ subj->last_delim = push_delimiter(subj, 1, '[', true, false, new_inl);
break;
case ']':
new_inl = handle_close_bracket(subj, parent);
@@ -886,7 +886,7 @@ static int parse_inline(subject* subj, cmark_node * parent)
if (peek_char(subj) == '[') {
advance(subj);
new_inl = make_str(chunk_literal("!["));
- subj->delimiters = push_delimiter(subj, 1, '!', false, true, new_inl);
+ subj->last_delim = push_delimiter(subj, 1, '!', false, true, new_inl);
} else {
new_inl = make_str(chunk_literal("!"));
}