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-rw-r--r--src/inlines.c1711
1 files changed, 908 insertions, 803 deletions
diff --git a/src/inlines.c b/src/inlines.c
index f75c846..4ff45ad 100644
--- a/src/inlines.c
+++ b/src/inlines.c
@@ -2,133 +2,154 @@
#include <stdio.h>
#include <stdbool.h>
#include <ctype.h>
-#include "bstrlib.h"
+#include <string.h>
+
#include "stmd.h"
#include "uthash.h"
#include "debug.h"
#include "scanners.h"
#include "utf8.h"
+typedef struct Subject {
+ const gh_buf *buffer;
+ int pos;
+ reference** reference_map;
+ int label_nestlevel;
+} subject;
+
+reference* lookup_reference(reference** refmap, chunk *label);
+reference* make_reference(chunk *label, chunk *url, chunk *title);
+
+static unsigned char *clean_url(chunk *url);
+static unsigned char *clean_title(chunk *title);
+
+inline static unsigned char *chunk_to_cstr(chunk *c);
+inline static void chunk_free(chunk *c);
+inline static void chunk_trim(chunk *c);
+
+inline static chunk chunk_literal(const char *data);
+inline static chunk chunk_buf_detach(gh_buf *buf);
+inline static chunk chunk_buf(const gh_buf *buf, int pos, int len);
+
+static inl *parse_chunk_inlines(chunk *chunk, reference** refmap);
+static inl *parse_inlines_while(subject* subj, int (*f)(subject*));
+static int parse_inline(subject* subj, inl ** last);
+
extern void free_reference(reference *ref) {
- bdestroy(ref->label);
- bdestroy(ref->url);
- bdestroy(ref->title);
- free(ref);
+ free(ref->label);
+ free(ref->url);
+ free(ref->title);
+ free(ref);
}
extern void free_reference_map(reference **refmap) {
- /* free the hash table contents */
- reference *s;
- reference *tmp;
- if (refmap != NULL) {
- HASH_ITER(hh, *refmap, s, tmp) {
- HASH_DEL(*refmap, s);
- free_reference(s);
- }
- free(refmap);
- }
+ /* free the hash table contents */
+ reference *s;
+ reference *tmp;
+ if (refmap != NULL) {
+ HASH_ITER(hh, *refmap, s, tmp) {
+ HASH_DEL(*refmap, s);
+ free_reference(s);
+ }
+ free(refmap);
+ }
}
// normalize reference: collapse internal whitespace to single space,
// remove leading/trailing whitespace, case fold
-static bstring normalize_reference(bstring s)
-{
- bstring normalized = case_fold(s);
- int pos = 0;
- int startpos;
- char c;
- while ((c = bchar(normalized, pos))) {
- if (isspace(c)) {
- startpos = pos;
- // skip til next non-space
- pos++;
- while (isspace(bchar(s, pos))) {
- pos++;
- }
- bdelete(normalized, startpos, pos - startpos);
- binsertch(normalized, startpos, 1, ' ');
- pos = startpos + 1;
- }
- pos++;
- }
- btrimws(normalized);
- return normalized;
+static unsigned char *normalize_reference(chunk *ref)
+{
+ gh_buf normalized = GH_BUF_INIT;
+ int r, w;
+
+ utf8proc_case_fold(&normalized, ref->data, ref->len);
+ gh_buf_trim(&normalized);
+
+ for (r = 0, w = 0; r < normalized.size; ++r) {
+ if (r && gh_buf_at(&normalized, r - 1) == ' ') {
+ while (gh_buf_at(&normalized, r) == ' ')
+ r++;
+ }
+
+ normalized.ptr[w++] = normalized.ptr[r];
+ }
+
+ return gh_buf_detach(&normalized);
}
// Returns reference if refmap contains a reference with matching
// label, otherwise NULL.
-extern reference* lookup_reference(reference** refmap, bstring lab)
+extern reference* lookup_reference(reference** refmap, chunk *label)
{
- reference * ref = NULL;
- bstring label = normalize_reference(lab);
- if (refmap != NULL) {
- HASH_FIND_STR(*refmap, (char*) label->data, ref);
- }
- bdestroy(label);
- return ref;
+ reference *ref = NULL;
+ unsigned char *norm = normalize_reference(label);
+ if (refmap != NULL) {
+ HASH_FIND_STR(*refmap, (char*)norm, ref);
+ }
+ free(label);
+ return ref;
}
-extern reference* make_reference(bstring label, bstring url, bstring title)
+extern reference* make_reference(chunk *label, chunk *url, chunk *title)
{
- reference * ref;
- ref = malloc(sizeof(reference));
- ref->label = normalize_reference(label);
- ref->url = bstrcpy(url);
- ref->title = bstrcpy(title);
- return ref;
+ reference *ref;
+ ref = malloc(sizeof(reference));
+ ref->label = normalize_reference(label);
+ ref->url = clean_url(url);
+ ref->title = clean_title(title);
+ return ref;
}
extern void add_reference(reference** refmap, reference* ref)
{
- reference * t = NULL;
- HASH_FIND(hh, *refmap, (char*) ref->label->data,
- (unsigned) blength(ref->label), t);
- if (t == NULL) {
- HASH_ADD_KEYPTR(hh, *refmap, (char*) ref->label->data,
- (unsigned) blength(ref->label), ref);
- } else {
- free_reference(ref); // we free this now since it won't be in the refmap
- }
+ reference * t = NULL;
+ HASH_FIND(hh, *refmap, (char*)ref->label, (unsigned)strlen(ref->label), t);
+
+ if (t == NULL) {
+ HASH_ADD_KEYPTR(hh, *refmap, (char*)ref->label, (unsigned)strlen(ref->label), ref);
+ } else {
+ free_reference(ref); // we free this now since it won't be in the refmap
+ }
}
// Create an inline with a linkable string value.
-inline static inl* make_linkable(int t, inl* label, bstring url, bstring title)
+inline static inl* make_linkable(int t, inl* label, chunk url, chunk title)
{
- inl* e = (inl*) malloc(sizeof(inl));
- e->tag = t;
- e->content.linkable.label = label;
- e->content.linkable.url = url;
- e->content.linkable.title = title;
- e->next = NULL;
- return e;
+ inl* e = (inl*) malloc(sizeof(inl));
+ e->tag = t;
+ e->content.linkable.label = label;
+ e->content.linkable.url = chunk_to_cstr(&url);
+ e->content.linkable.title = chunk_to_cstr(&title);
+ e->next = NULL;
+ return e;
}
inline static inl* make_inlines(int t, inl* contents)
{
- inl* e = (inl*) malloc(sizeof(inl));
- e->tag = t;
- e->content.inlines = contents;
- e->next = NULL;
- return e;
+ inl* e = (inl*) malloc(sizeof(inl));
+ e->tag = t;
+ e->content.inlines = contents;
+ e->next = NULL;
+ return e;
}
// Create an inline with a literal string value.
-inline static inl* make_literal(int t, bstring s)
+inline static inl* make_literal(int t, chunk s)
{
- inl* e = (inl*) malloc(sizeof(inl));
- e->tag = t;
- e->content.literal = s;
- e->next = NULL;
- return e;
+ inl* e = (inl*) malloc(sizeof(inl));
+ e->tag = t;
+ e->content.literal = s;
+ e->next = NULL;
+ return e;
}
// Create an inline with no value.
inline static inl* make_simple(int t)
{
- inl* e = (inl*) malloc(sizeof(inl));
- e->tag = t;
- e->next = NULL;
- return e;
+ inl* e = (inl*) malloc(sizeof(inl));
+ e->tag = t;
+ e->next = NULL;
+ return e;
}
// Macros for creating various kinds of inlines.
@@ -139,113 +160,157 @@ inline static inl* make_simple(int t)
#define make_linebreak() make_simple(linebreak)
#define make_softbreak() make_simple(softbreak)
#define make_link(label, url, title) make_linkable(link, label, url, title)
-#define make_image(alt, url, title) make_linkable(image, alt, url, title)
#define make_emph(contents) make_inlines(emph, contents)
#define make_strong(contents) make_inlines(strong, contents)
// Free an inline list.
extern void free_inlines(inl* e)
{
- inl * next;
- while (e != NULL) {
- switch (e->tag){
- case str:
- case raw_html:
- case code:
- case entity:
- bdestroy(e->content.literal);
- break;
- case linebreak:
- case softbreak:
- break;
- case link:
- case image:
- bdestroy(e->content.linkable.url);
- bdestroy(e->content.linkable.title);
- free_inlines(e->content.linkable.label);
- break;
- case emph:
- case strong:
- free_inlines(e->content.inlines);
- break;
- default:
- break;
- }
- next = e->next;
- free(e);
- e = next;
- }
+ inl * next;
+ while (e != NULL) {
+ switch (e->tag){
+ case str:
+ case raw_html:
+ case code:
+ case entity:
+ chunk_free(&e->content.literal);
+ break;
+ case linebreak:
+ case softbreak:
+ break;
+ case link:
+ case image:
+ free(e->content.linkable.url);
+ free(e->content.linkable.title);
+ free_inlines(e->content.linkable.label);
+ break;
+ case emph:
+ case strong:
+ free_inlines(e->content.inlines);
+ break;
+ default:
+ break;
+ }
+ next = e->next;
+ free(e);
+ e = next;
+ }
}
// Append inline list b to the end of inline list a.
// Return pointer to head of new list.
inline static inl* append_inlines(inl* a, inl* b)
{
- if (a == NULL) { // NULL acts like an empty list
- return b;
- }
- inl* cur = a;
- while (cur->next) {
- cur = cur->next;
- }
- cur->next = b;
- return a;
+ if (a == NULL) { // NULL acts like an empty list
+ return b;
+ }
+ inl* cur = a;
+ while (cur->next) {
+ cur = cur->next;
+ }
+ cur->next = b;
+ return a;
}
// Make a 'subject' from an input string.
-static subject* make_subject(bstring s, reference** refmap)
+static void init_subject(subject *e, gh_buf *buffer, int input_pos, reference** refmap)
{
- subject* e = (subject*) malloc(sizeof(subject));
- // remove final whitespace
- brtrimws(s);
- e->buffer = s;
- e->pos = 0;
- e->label_nestlevel = 0;
- e->reference_map = refmap;
- return e;
+ e->buffer = buffer;
+ e->pos = input_pos;
+ e->label_nestlevel = 0;
+ e->reference_map = refmap;
}
inline static int isbacktick(int c)
{
- return (c == '`');
+ return (c == '`');
+}
+
+inline static void chunk_free(chunk *c)
+{
+ if (c->alloc)
+ free((char *)c->data);
+
+ c->data = NULL;
+ c->alloc = 0;
+ c->len = 0;
+}
+
+inline static void chunk_trim(chunk *c)
+{
+ while (c->len && isspace(c->data[0])) {
+ c->data++;
+ c->len--;
+ }
+
+ while (c->len > 0) {
+ if (!isspace(c->data[c->len - 1]))
+ break;
+
+ c->len--;
+ }
+}
+
+inline static unsigned char *chunk_to_cstr(chunk *c)
+{
+ unsigned char *str;
+
+ str = malloc(c->len + 1);
+ memcpy(str, c->data, c->len);
+ str[c->len] = 0;
+
+ return str;
+}
+
+inline static chunk chunk_literal(const char *data)
+{
+ chunk c = {data, strlen(data), 0};
+ return c;
+}
+
+inline static chunk chunk_buf(const gh_buf *buf, int pos, int len)
+{
+ chunk c = {buf->ptr + pos, len, 0};
+ return c;
+}
+
+inline static chunk chunk_buf_detach(gh_buf *buf)
+{
+ chunk c;
+
+ c.len = buf->size;
+ c.data = gh_buf_detach(buf);
+ c.alloc = 1;
+
+ return c;
}
// Return the next character in the subject, without advancing.
// Return 0 if at the end of the subject.
-#define peek_char(subj) bchar(subj->buffer, subj->pos)
+#define peek_char(subj) gh_buf_at((subj)->buffer, (subj)->pos)
// Return true if there are more characters in the subject.
inline static int is_eof(subject* subj)
{
- return (subj->pos >= blength(subj->buffer));
+ return (subj->pos >= gh_buf_len(subj->buffer));
}
// Advance the subject. Doesn't check for eof.
-#define advance(subj) subj->pos += 1
+#define advance(subj) (subj)->pos += 1
// Take characters while a predicate holds, and return a string.
-inline static bstring take_while(subject* subj, int (*f)(int))
+inline static chunk take_while(subject* subj, int (*f)(int))
{
- unsigned char c;
- int startpos = subj->pos;
- int len = 0;
- while ((c = peek_char(subj)) && (*f)(c)) {
- advance(subj);
- len++;
- }
- return bmidstr(subj->buffer, startpos, len);
-}
+ unsigned char c;
+ int startpos = subj->pos;
+ int len = 0;
-// Take one character and return a string, or NULL if eof.
-inline static bstring take_one(subject* subj)
-{
- int startpos = subj->pos;
- if (is_eof(subj)){
- return NULL;
- } else {
- advance(subj);
- return bmidstr(subj->buffer, startpos, 1);
- }
+ while ((c = peek_char(subj)) && (*f)(c)) {
+ advance(subj);
+ len++;
+ }
+
+ return chunk_buf(subj->buffer, startpos, len);
}
// Try to process a backtick code span that began with a
@@ -255,381 +320,406 @@ inline static bstring take_one(subject* subj)
// after the closing backticks.
static int scan_to_closing_backticks(subject* subj, int openticklength)
{
- // read non backticks
- char c;
- while ((c = peek_char(subj)) && c != '`') {
- advance(subj);
- }
- if (is_eof(subj)) {
- return 0; // did not find closing ticks, return 0
- }
- int numticks = 0;
- while (peek_char(subj) == '`') {
- advance(subj);
- numticks++;
- }
- if (numticks != openticklength){
- return(scan_to_closing_backticks(subj, openticklength));
- }
- return (subj->pos);
-}
-
-// Destructively modify bstring, collapsing consecutive
+ // read non backticks
+ char c;
+ while ((c = peek_char(subj)) && c != '`') {
+ advance(subj);
+ }
+ if (is_eof(subj)) {
+ return 0; // did not find closing ticks, return 0
+ }
+ int numticks = 0;
+ while (peek_char(subj) == '`') {
+ advance(subj);
+ numticks++;
+ }
+ if (numticks != openticklength){
+ return(scan_to_closing_backticks(subj, openticklength));
+ }
+ return (subj->pos);
+}
+
+// Destructively modify string, collapsing consecutive
// space and newline characters into a single space.
-static int normalize_whitespace(bstring s)
-{
- bool last_char_was_space = false;
- int pos = 0;
- char c;
- while ((c = bchar(s, pos))) {
- switch (c) {
- case ' ':
- if (last_char_was_space) {
- bdelete(s, pos, 1);
- } else {
- pos++;
- }
- last_char_was_space = true;
- break;
- case '\n':
- if (last_char_was_space) {
- bdelete(s, pos, 1);
- } else {
- bdelete(s, pos, 1);
- binsertch(s, pos, 1, ' ');
- pos++;
- }
- last_char_was_space = true;
- break;
- default:
- pos++;
- last_char_was_space = false;
- }
- }
- return 0;
+static void normalize_whitespace(gh_buf *s)
+{
+ /* TODO */
+#if 0
+ bool last_char_was_space = false;
+ int pos = 0;
+ char c;
+ while ((c = gh_buf_at(s, pos))) {
+ switch (c) {
+ case ' ':
+ if (last_char_was_space) {
+ bdelete(s, pos, 1);
+ } else {
+ pos++;
+ }
+ last_char_was_space = true;
+ break;
+ case '\n':
+ if (last_char_was_space) {
+ bdelete(s, pos, 1);
+ } else {
+ bdelete(s, pos, 1);
+ binsertch(s, pos, 1, ' ');
+ pos++;
+ }
+ last_char_was_space = true;
+ break;
+ default:
+ pos++;
+ last_char_was_space = false;
+ }
+ }
+#endif
}
// Parse backtick code section or raw backticks, return an inline.
// Assumes that the subject has a backtick at the current position.
static inl* handle_backticks(subject *subj)
{
- bstring openticks = take_while(subj, isbacktick);
- bstring result;
- int ticklength = blength(openticks);
- int startpos = subj->pos;
- int endpos = scan_to_closing_backticks(subj, ticklength);
- if (endpos == 0) { // not found
- subj->pos = startpos; // rewind
- return make_str(openticks);
- } else {
- bdestroy(openticks);
- result = bmidstr(subj->buffer, startpos, endpos - startpos - ticklength);
- btrimws(result);
- normalize_whitespace(result);
- return make_code(result);
- }
+ chunk openticks = take_while(subj, isbacktick);
+ int startpos = subj->pos;
+ int endpos = scan_to_closing_backticks(subj, openticks.len);
+
+ if (endpos == 0) { // not found
+ subj->pos = startpos; // rewind
+ return make_str(openticks);
+ } else {
+ gh_buf buf = GH_BUF_INIT;
+
+ gh_buf_set(&buf, subj->buffer->ptr + startpos, endpos - startpos - openticks.len);
+ gh_buf_trim(&buf);
+ normalize_whitespace(&buf);
+
+ return make_code(chunk_buf_detach(&buf));
+ }
}
// Scan ***, **, or * and return number scanned, or 0.
// Don't advance 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' : bchar(subj->buffer, subj->pos - 1);
- while (peek_char(subj) == c) {
- numdelims++;
- advance(subj);
- }
- char_after = peek_char(subj);
- *can_open = numdelims > 0 && numdelims <= 3 && !isspace(char_after);
- *can_close = numdelims > 0 && numdelims <= 3 && !isspace(char_before);
- if (c == '_') {
- *can_open = *can_open && !isalnum(char_before);
- *can_close = *can_close && !isalnum(char_after);
- }
- subj->pos = startpos;
- return numdelims;
+ int numdelims = 0;
+ char char_before, char_after;
+ int startpos = subj->pos;
+
+ char_before = subj->pos == 0 ? '\n' : gh_buf_at(subj->buffer, subj->pos - 1);
+ while (peek_char(subj) == c) {
+ numdelims++;
+ advance(subj);
+ }
+ char_after = peek_char(subj);
+ *can_open = numdelims > 0 && numdelims <= 3 && !isspace(char_after);
+ *can_close = numdelims > 0 && numdelims <= 3 && !isspace(char_before);
+ if (c == '_') {
+ *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 inl* handle_strong_emph(subject* subj, char c)
{
- bool can_open, can_close;
- inl * result = NULL;
- inl ** last = malloc(sizeof(inl *));
- inl * new;
- inl * il;
- inl * first_head = NULL;
- inl * first_close = NULL;
- int first_close_delims = 0;
- int numdelims;
-
- *last = NULL;
-
- numdelims = scan_delims(subj, c, &can_open, &can_close);
- subj->pos += numdelims;
-
- new = make_str(bmidstr(subj->buffer, 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 = emph;
- bdestroy(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 = strong;
- bdestroy(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(bmidstr(subj->buffer, 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 ? strong : emph;
- bdestroy(first_head->content.literal);
- first_head->content.inlines =
- make_inlines(first_close_delims == 1 ? emph : 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;
- }
-
- done:
- free(last);
- return result;
+ bool can_open, can_close;
+ inl * result = NULL;
+ inl ** last = malloc(sizeof(inl *));
+ inl * new;
+ inl * il;
+ inl * first_head = NULL;
+ inl * first_close = NULL;
+ int first_close_delims = 0;
+ int numdelims;
+
+ *last = NULL;
+
+ numdelims = scan_delims(subj, c, &can_open, &can_close);
+ subj->pos += numdelims;
+
+ new = make_str(chunk_buf(subj->buffer, 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 = 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 = 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_buf(subj->buffer, 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 ? strong : emph;
+ chunk_free(&first_head->content.literal);
+ first_head->content.inlines =
+ make_inlines(first_close_delims == 1 ? emph : 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;
+ }
+
+done:
+ free(last);
+ return result;
}
// Parse backslash-escape or just a backslash, returning an inline.
static inl* handle_backslash(subject *subj)
{
- advance(subj);
- unsigned char nextchar = peek_char(subj);
- if (ispunct(nextchar)) { // only ascii symbols and newline can be escaped
- advance(subj);
- return make_str(bformat("%c", nextchar));
- } else if (nextchar == '\n') {
- advance(subj);
- return make_linebreak();
- } else {
- return make_str(bfromcstr("\\"));
- }
+ advance(subj);
+ unsigned char nextchar = peek_char(subj);
+ if (ispunct(nextchar)) { // only ascii symbols and newline can be escaped
+ advance(subj);
+ return make_str(chunk_buf(subj->buffer, subj->pos - 1, 1));
+ } else if (nextchar == '\n') {
+ advance(subj);
+ return make_linebreak();
+ } else {
+ return make_str(chunk_literal("\\"));
+ }
}
// Parse an entity or a regular "&" string.
// Assumes the subject has an '&' character at the current position.
static inl* handle_entity(subject* subj)
{
- int match;
- inl * result;
- match = scan_entity(subj->buffer, subj->pos);
- if (match) {
- result = make_entity(bmidstr(subj->buffer, subj->pos, match));
- subj->pos += match;
- } else {
- advance(subj);
- result = make_str(bfromcstr("&"));
- }
- return result;
+ int match;
+ inl *result;
+ match = scan_entity(subj->buffer, subj->pos);
+ if (match) {
+ result = make_entity(chunk_buf(subj->buffer, subj->pos, match));
+ subj->pos += match;
+ } else {
+ advance(subj);
+ result = make_str(chunk_literal("&"));
+ }
+ return result;
}
// Like make_str, but parses entities.
// Returns an inline sequence consisting of str and entity elements.
-static inl * make_str_with_entities(bstring s)
-{
- inl * result = NULL;
- inl * new;
- int searchpos;
- char c;
- subject * subj = make_subject(s, NULL);
-
- while ((c = peek_char(subj))) {
- switch (c) {
- case '&':
- new = handle_entity(subj);
- break;
- default:
- searchpos = bstrchrp(subj->buffer, '&', subj->pos);
- if (searchpos == BSTR_ERR) {
- searchpos = blength(subj->buffer);
- }
- new = make_str(bmidstr(subj->buffer, subj->pos, searchpos - subj->pos));
- subj->pos = searchpos;
- }
- result = append_inlines(result, new);
- }
- free(subj);
- return result;
+static inl *make_str_with_entities(chunk *content)
+{
+ inl * result = NULL;
+ inl * new;
+ int searchpos;
+ char c;
+ subject subj;
+ gh_buf content_buf = GH_BUF_INIT;
+
+ gh_buf_set(&content_buf, content->data, content->len);
+ init_subject(&subj, &content_buf, 0, NULL);
+
+ while ((c = peek_char(&subj))) {
+ switch (c) {
+ case '&':
+ new = handle_entity(&subj);
+ break;
+ default:
+ searchpos = gh_buf_strchr(subj.buffer, '&', subj.pos);
+ if (searchpos < 0) {
+ searchpos = gh_buf_len(subj.buffer);
+ }
+
+ new = make_str(chunk_buf(subj.buffer, subj.pos, searchpos - subj.pos));
+ subj.pos = searchpos;
+ }
+ result = append_inlines(result, new);
+ }
+
+ gh_buf_free(&content_buf);
+ return result;
}
// Destructively unescape a string: remove backslashes before punctuation chars.
-extern int unescape(bstring url)
+extern void unescape_buffer(gh_buf *buf)
{
- // remove backslashes before punctuation chars:
- int searchpos = 0;
- while ((searchpos = bstrchrp(url, '\\', searchpos)) != BSTR_ERR) {
- if (ispunct(bchar(url, searchpos + 1))) {
- bdelete(url, searchpos, 1);
- } else {
- searchpos++;
- }
- }
- return 0;
+ int r, w;
+
+ for (r = 0, w = 0; r < buf->size; ++r) {
+ if (buf->ptr[r] == '\\' && ispunct(buf->ptr[r + 1]))
+ continue;
+
+ buf->ptr[w++] = buf->ptr[r];
+ }
+
+ gh_buf_truncate(buf, w);
}
// Clean a URL: remove surrounding whitespace and surrounding <>,
// and remove \ that escape punctuation.
-static int clean_url(bstring url)
+static unsigned char *clean_url(chunk *url)
{
- // remove surrounding <> if any:
- int urllength = blength(url);
- btrimws(url);
- if (bchar(url, 0) == '<' && bchar(url, urllength - 1) == '>') {
- bdelete(url, 0, 1);
- bdelete(url, urllength - 2, 1);
- }
- unescape(url);
- return 0;
+ gh_buf buf = GH_BUF_INIT;
+
+ chunk_trim(url);
+
+ if (url->data[0] == '<' && url->data[url->len - 1] == '>') {
+ gh_buf_set(&buf, url->data + 1, url->len - 2);
+ } else {
+ gh_buf_set(&buf, url->data, url->len);
+ }
+
+ unescape_buffer(&buf);
+ return gh_buf_detach(&buf);
}
// Clean a title: remove surrounding quotes and remove \ that escape punctuation.
-static int clean_title(bstring title)
+static unsigned char *clean_title(chunk *title)
{
- // remove surrounding quotes if any:
- int titlelength = blength(title);
- if ((bchar(title, 0) == '\'' && bchar(title, titlelength - 1) == '\'') ||
- (bchar(title, 0) == '(' && bchar(title, titlelength - 1) == ')') ||
- (bchar(title, 0) == '"' && bchar(title, titlelength - 1) == '"')) {
- bdelete(title, 0, 1);
- bdelete(title, titlelength - 2, 1);
- }
- unescape(title);
- return 0;
+ gh_buf buf = GH_BUF_INIT;
+ unsigned char first = title->data[0];
+ unsigned char last = title->data[title->len - 1];
+
+ // remove surrounding quotes if any:
+ if ((first == '\'' && last == '\'') ||
+ (first == '(' && last == ')') ||
+ (first == '"' && last == '"')) {
+ gh_buf_set(&buf, title->data + 1, title->len - 2);
+ } else {
+ gh_buf_set(&buf, title->data, title->len);
+ }
+
+ unescape_buffer(&buf);
+ return gh_buf_detach(&buf);
}
// Parse an autolink or HTML tag.
// Assumes the subject has a '<' character at the current position.
static inl* handle_pointy_brace(subject* subj)
{
- int matchlen = 0;
- bstring contents;
- inl* result;
-
- advance(subj); // advance past first <
- // first try to match a URL autolink
- matchlen = scan_autolink_uri(subj->buffer, subj->pos);
- if (matchlen > 0) {
- contents = bmidstr(subj->buffer, subj->pos, matchlen - 1);
- subj->pos += matchlen;
- result = make_link(make_str_with_entities(contents),
- bstrcpy(contents), bfromcstr(""));
- bdestroy(contents);
- return result;
- }
- // next try to match an email autolink
- matchlen = scan_autolink_email(subj->buffer, subj->pos);
- if (matchlen > 0) {
- contents = bmidstr(subj->buffer, subj->pos, matchlen - 1);
- subj->pos += matchlen;
- result = make_link(make_str_with_entities(contents),
- bformat("mailto:%s", contents->data),
- bfromcstr(""));
- bdestroy(contents);
- return result;
- }
- // finally, try to match an html tag
- matchlen = scan_html_tag(subj->buffer, subj->pos);
- if (matchlen > 0) {
- contents = bmidstr(subj->buffer, subj->pos, matchlen);
- binsertch(contents, 0, 1, '<');
- subj->pos += matchlen;
- return make_raw_html(contents);
- } else {// if nothing matches, just return the opening <:
- return make_str(bfromcstr("<"));
- }
+ int matchlen = 0;
+ chunk contents;
+
+ advance(subj); // advance past first <
+
+ // first try to match a URL autolink
+ matchlen = scan_autolink_uri(subj->buffer, subj->pos);
+ if (matchlen > 0) {
+ contents = chunk_buf(subj->buffer, subj->pos, matchlen - 1);
+ subj->pos += matchlen;
+
+ return make_link(
+ make_str_with_entities(&contents),
+ contents,
+ chunk_literal("")
+ );
+ }
+
+ // next try to match an email autolink
+ matchlen = scan_autolink_email(subj->buffer, subj->pos);
+ if (matchlen > 0) {
+ gh_buf mail_url = GH_BUF_INIT;
+
+ contents = chunk_buf(subj->buffer, subj->pos, matchlen - 1);
+ subj->pos += matchlen;
+
+ gh_buf_puts(&mail_url, "mailto:");
+ gh_buf_put(&mail_url, contents.data, contents.len);
+
+ return make_link(
+ make_str_with_entities(&contents),
+ chunk_buf_detach(&mail_url),
+ chunk_literal("")
+ );
+ }
+
+ // finally, try to match an html tag
+ matchlen = scan_html_tag(subj->buffer, subj->pos);
+ if (matchlen > 0) {
+ contents = chunk_buf(subj->buffer, subj->pos - 1, matchlen + 1);
+ subj->pos += matchlen;
+ return make_raw_html(contents);
+ }
+
+ // if nothing matches, just return the opening <:
+ return make_str(chunk_literal("<"));
}
// Parse a link label. Returns 1 if successful.
@@ -641,366 +731,381 @@ static inl* handle_pointy_brace(subject* subj)
// markers. So, 2 below contains a link while 1 does not:
// 1. [a link `with a ](/url)` character
// 2. [a link *with emphasized ](/url) text*
-static int link_label(subject* subj, bstring* raw_label)
-{
- int nestlevel = 0;
- inl* tmp = NULL;
- bstring raw;
- int startpos = subj->pos;
- if (subj->label_nestlevel) {
- // if we've already checked to the end of the subject
- // for a label, even with a different starting [, we
- // know we won't find one here and we can just return.
- // Note: nestlevel 1 would be: [foo [bar]
- // nestlevel 2 would be: [foo [bar [baz]
- subj->label_nestlevel--;
- return 0;
- }
- advance(subj); // advance past [
- char c;
- while ((c = peek_char(subj)) && (c != ']' || nestlevel > 0)) {
- switch (c) {
- case '`':
- tmp = handle_backticks(subj);
- free_inlines(tmp);
- break;
- case '<':
- tmp = handle_pointy_brace(subj);
- free_inlines(tmp);
- break;
- case '[': // nested []
- nestlevel++;
- advance(subj);
- break;
- case ']': // nested []
- nestlevel--;
- advance(subj);
- break;
- case '\\':
- advance(subj);
- if (ispunct(peek_char(subj))) {
- advance(subj);
- }
- break;
- default:
- advance(subj);
- }
- }
- if (c == ']') {
- if (raw_label != NULL) {
- raw = bmidstr(subj->buffer, startpos + 1, subj->pos - (startpos + 1));
- *raw_label = raw;
- }
- subj->label_nestlevel = 0;
- advance(subj); // advance past ]
- return 1;
- } else {
- if (c == 0) {
- subj->label_nestlevel = nestlevel;
- }
- subj->pos = startpos; // rewind
- return 0;
- }
+static int link_label(subject* subj, chunk *raw_label)
+{
+ int nestlevel = 0;
+ inl* tmp = NULL;
+ int startpos = subj->pos;
+
+ if (subj->label_nestlevel) {
+ // if we've already checked to the end of the subject
+ // for a label, even with a different starting [, we
+ // know we won't find one here and we can just return.
+ // Note: nestlevel 1 would be: [foo [bar]
+ // nestlevel 2 would be: [foo [bar [baz]
+ subj->label_nestlevel--;
+ return 0;
+ }
+
+ advance(subj); // advance past [
+ char c;
+ while ((c = peek_char(subj)) && (c != ']' || nestlevel > 0)) {
+ switch (c) {
+ case '`':
+ tmp = handle_backticks(subj);
+ free_inlines(tmp);
+ break;
+ case '<':
+ tmp = handle_pointy_brace(subj);
+ free_inlines(tmp);
+ break;
+ case '[': // nested []
+ nestlevel++;
+ advance(subj);
+ break;
+ case ']': // nested []
+ nestlevel--;
+ advance(subj);
+ break;
+ case '\\':
+ advance(subj);
+ if (ispunct(peek_char(subj))) {
+ advance(subj);
+ }
+ break;
+ default:
+ advance(subj);
+ }
+ }
+ if (c == ']') {
+ *raw_label = chunk_buf(
+ subj->buffer,
+ startpos + 1,
+ subj->pos - (startpos + 1)
+ );
+
+ subj->label_nestlevel = 0;
+ advance(subj); // advance past ]
+ return 1;
+ } else {
+ if (c == 0) {
+ subj->label_nestlevel = nestlevel;
+ }
+ subj->pos = startpos; // rewind
+ return 0;
+ }
}
// Parse a link or the link portion of an image, or return a fallback.
static inl* handle_left_bracket(subject* subj)
{
- inl* lab = NULL;
- inl* result = NULL;
- reference* ref;
- int n;
- int sps;
- int found_label;
- int endlabel, starturl, endurl, starttitle, endtitle, endall;
- bstring url, title, rawlabel, reflabel;
- bstring rawlabel2 = NULL;
- found_label = link_label(subj, &rawlabel);
- endlabel = subj->pos;
- if (found_label) {
- if (peek_char(subj) == '(' &&
- ((sps = scan_spacechars(subj->buffer, subj->pos + 1)) > -1) &&
- ((n = scan_link_url(subj->buffer, subj->pos + 1 + sps)) > -1)) {
- // try to parse an explicit link:
- starturl = subj->pos + 1 + sps; // after (
- endurl = starturl + n;
- starttitle = endurl + scan_spacechars(subj->buffer, endurl);
- // ensure there are spaces btw url and title
- endtitle = (starttitle == endurl) ? starttitle :
- starttitle + scan_link_title(subj->buffer, starttitle);
- endall = endtitle + scan_spacechars(subj->buffer, endtitle);
- if (bchar(subj->buffer, endall) == ')') {
- subj->pos = endall + 1;
- url = bmidstr(subj->buffer, starturl, endurl - starturl);
- clean_url(url);
- title = bmidstr(subj->buffer, starttitle, endtitle - starttitle);
- clean_title(title);
- lab = parse_inlines(rawlabel, NULL);
- bdestroy(rawlabel);
- return make_link(lab, url, title);
- } else {
- // if we get here, we matched a label but didn't get further:
- subj->pos = endlabel;
- lab = parse_inlines(rawlabel, subj->reference_map);
- bdestroy(rawlabel);
- result = append_inlines(make_str(bfromcstr("[")),
- append_inlines(lab,
- make_str(bfromcstr("]"))));
- return result;
- }
- } else {
- // Check for reference link.
- // First, see if there's another label:
- subj->pos = subj->pos + scan_spacechars(subj->buffer, endlabel);
- reflabel = rawlabel;
- // if followed by a nonempty link label, we change reflabel to it:
- if (peek_char(subj) == '[' &&
- link_label(subj, &rawlabel2)) {
- if (blength(rawlabel2) > 0) {
- reflabel = rawlabel2;
- }
- } else {
- subj->pos = endlabel;
- }
- // lookup rawlabel in subject->reference_map:
- ref = lookup_reference(subj->reference_map, reflabel);
- if (ref != NULL) { // found
- lab = parse_inlines(rawlabel, NULL);
- result = make_link(lab, bstrcpy(ref->url), bstrcpy(ref->title));
- } else {
- subj->pos = endlabel;
- lab = parse_inlines(rawlabel, subj->reference_map);
- result = append_inlines(make_str(bfromcstr("[")),
- append_inlines(lab, make_str(bfromcstr("]"))));
- }
- bdestroy(rawlabel);
- bdestroy(rawlabel2);
- return result;
- }
- }
- // If we fall through to here, it means we didn't match a link:
- advance(subj); // advance past [
- return make_str(bfromcstr("["));
+ inl *lab = NULL;
+ inl *result = NULL;
+ reference *ref;
+ int n;
+ int sps;
+ int found_label;
+ int endlabel, starturl, endurl, starttitle, endtitle, endall;
+
+ chunk rawlabel;
+ chunk url, title;
+
+ found_label = link_label(subj, &rawlabel);
+ endlabel = subj->pos;
+
+ if (found_label) {
+ if (peek_char(subj) == '(' &&
+ ((sps = scan_spacechars(subj->buffer, subj->pos + 1)) > -1) &&
+ ((n = scan_link_url(subj->buffer, subj->pos + 1 + sps)) > -1)) {
+
+ // try to parse an explicit link:
+ starturl = subj->pos + 1 + sps; // after (
+ endurl = starturl + n;
+ starttitle = endurl + scan_spacechars(subj->buffer, endurl);
+
+ // ensure there are spaces btw url and title
+ endtitle = (starttitle == endurl) ? starttitle :
+ starttitle + scan_link_title(subj->buffer, starttitle);
+
+ endall = endtitle + scan_spacechars(subj->buffer, endtitle);
+
+ if (gh_buf_at(subj->buffer, endall) == ')') {
+ subj->pos = endall + 1;
+
+ url = chunk_buf(subj->buffer, starturl, endurl - starturl);
+ title = chunk_buf(subj->buffer, starttitle, endtitle - starttitle);
+ lab = parse_chunk_inlines(&rawlabel, NULL);
+
+ return make_link(lab, url, title);
+ } else {
+ // if we get here, we matched a label but didn't get further:
+ subj->pos = endlabel;
+ lab = parse_chunk_inlines(&rawlabel, subj->reference_map);
+ result = append_inlines(make_str(chunk_literal("[")),
+ append_inlines(lab,
+ make_str(chunk_literal("]"))));
+ return result;
+ }
+ } else {
+ chunk rawlabel_tmp;
+ chunk reflabel;
+
+ // Check for reference link.
+ // First, see if there's another label:
+ subj->pos = subj->pos + scan_spacechars(subj->buffer, endlabel);
+ reflabel = rawlabel;
+
+ // if followed by a nonempty link label, we change reflabel to it:
+ if (peek_char(subj) == '[' && link_label(subj, &rawlabel_tmp)) {
+ if (rawlabel_tmp.len > 0)
+ reflabel = rawlabel_tmp;
+ } else {
+ subj->pos = endlabel;
+ }
+
+ // lookup rawlabel in subject->reference_map:
+ ref = lookup_reference(subj->reference_map, &reflabel);
+ if (ref != NULL) { // found
+ lab = parse_chunk_inlines(&rawlabel, NULL);
+ result = make_link(lab, chunk_literal(ref->url), chunk_literal(ref->title));
+ } else {
+ subj->pos = endlabel;
+ lab = parse_chunk_inlines(&rawlabel, subj->reference_map);
+ result = append_inlines(make_str(chunk_literal("[")),
+ append_inlines(lab, make_str(chunk_literal("]"))));
+ }
+ return result;
+ }
+ }
+ // If we fall through to here, it means we didn't match a link:
+ advance(subj); // advance past [
+ return make_str(chunk_literal("["));
}
// Parse a hard or soft linebreak, returning an inline.
// Assumes the subject has a newline at the current position.
static inl* handle_newline(subject *subj)
{
- int nlpos = subj->pos;
- // skip over newline
- advance(subj);
- // skip spaces at beginning of line
- while (peek_char(subj) == ' ') {
- advance(subj);
- }
- if (nlpos > 1 &&
- bchar(subj->buffer, nlpos - 1) == ' ' &&
- bchar(subj->buffer, nlpos - 2) == ' ') {
- return make_linebreak();
- } else {
- return make_softbreak();
- }
+ int nlpos = subj->pos;
+ // skip over newline
+ advance(subj);
+ // skip spaces at beginning of line
+ while (peek_char(subj) == ' ') {
+ advance(subj);
+ }
+ if (nlpos > 1 &&
+ gh_buf_at(subj->buffer, nlpos - 1) == ' ' &&
+ gh_buf_at(subj->buffer, nlpos - 2) == ' ') {
+ return make_linebreak();
+ } else {
+ return make_softbreak();
+ }
}
inline static int not_eof(subject* subj)
{
- return !is_eof(subj);
+ return !is_eof(subj);
}
// Parse inlines while a predicate is satisfied. Return inlines.
extern inl* parse_inlines_while(subject* subj, int (*f)(subject*))
{
- inl* result = NULL;
- inl** last = &result;
- while ((*f)(subj) && parse_inline(subj, last)) {
- }
- return result;
+ inl* result = NULL;
+ inl** last = &result;
+ while ((*f)(subj) && parse_inline(subj, last)) {
+ }
+ return result;
+}
+
+inl *parse_chunk_inlines(chunk *chunk, reference** refmap)
+{
+ inl *result;
+ subject subj;
+ gh_buf full_chunk = GH_BUF_INIT;
+
+ gh_buf_set(&full_chunk, chunk->data, chunk->len);
+ init_subject(&subj, &full_chunk, 0, refmap);
+ result = parse_inlines_while(&subj, not_eof);
+
+ gh_buf_free(&full_chunk);
+ return result;
+}
+
+static int find_special_char(subject *subj)
+{
+ int n = subj->pos + 1;
+ int size = (int)gh_buf_len(subj->buffer);
+
+ while (n < size) {
+ if (strchr("\n\\`&_*[]<!", gh_buf_at(subj->buffer, n)))
+ return n;
+ }
+
+ return -1;
}
// 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.
-extern int parse_inline(subject* subj, inl ** last)
-{
- inl* new = NULL;
- bstring contents;
- bstring special_chars;
- unsigned char c;
- int endpos;
- c = peek_char(subj);
- if (c == 0) {
- return 0;
- }
- switch(c){
- case '\n':
- new = handle_newline(subj);
- break;
- case '`':
- new = handle_backticks(subj);
- break;
- case '\\':
- new = handle_backslash(subj);
- break;
- case '&':
- new = handle_entity(subj);
- break;
- case '<':
- new = handle_pointy_brace(subj);
- break;
- case '_':
- if (subj->pos > 0 && (isalnum(bchar(subj->buffer, subj->pos - 1)) ||
- bchar(subj->buffer, subj->pos - 1) == '_')) {
- new = make_str(take_one(subj));
- } else {
- new = handle_strong_emph(subj, '_');
- }
- break;
- case '*':
- new = handle_strong_emph(subj, '*');
- break;
- case '[':
- new = handle_left_bracket(subj);
- break;
- case '!':
- advance(subj);
- if (peek_char(subj) == '[') {
- new = handle_left_bracket(subj);
- if (new != NULL && new->tag == link) {
- new->tag = image;
- } else {
- new = append_inlines(make_str(bfromcstr("!")), new);
- }
- } else {
- new = make_str(bfromcstr("!"));
- }
- break;
- default:
- // we read until we hit a special character
- special_chars = bfromcstr("\n\\`&_*[]<!");
- endpos = binchr(subj->buffer, subj->pos, special_chars);
- bdestroy(special_chars);
- if (endpos == subj->pos) {
- // current char is special: read a 1-character str
- contents = take_one(subj);
- } else if (endpos == BSTR_ERR) {
- // special char not found, take whole rest of buffer:
- endpos = subj->buffer->slen;
- contents = bmidstr(subj->buffer, subj->pos, endpos - subj->pos);
- subj->pos = endpos;
- } else {
- // take buffer from subj->pos to endpos to str.
- contents = bmidstr(subj->buffer, subj->pos, endpos - subj->pos);
- subj->pos = endpos;
- // if we're at a newline, strip trailing spaces.
- if (peek_char(subj) == '\n') {
- brtrimws(contents);
- }
- }
- new = make_str(contents);
- }
- if (*last == NULL) {
- *last = new;
- } else {
- append_inlines(*last, new);
- }
- return 1;
-}
-
-extern inl* parse_inlines(bstring input, reference** refmap)
-{
- subject * subj = make_subject(input, refmap);
- inl * result = parse_inlines_while(subj, not_eof);
- free(subj);
- return result;
+static int parse_inline(subject* subj, inl ** last)
+{
+ inl* new = NULL;
+ chunk contents;
+ unsigned char c;
+ int endpos;
+ c = peek_char(subj);
+ if (c == 0) {
+ return 0;
+ }
+ switch(c){
+ case '\n':
+ new = handle_newline(subj);
+ break;
+ case '`':
+ new = handle_backticks(subj);
+ break;
+ case '\\':
+ new = handle_backslash(subj);
+ break;
+ case '&':
+ new = handle_entity(subj);
+ break;
+ case '<':
+ new = handle_pointy_brace(subj);
+ break;
+ case '_':
+ if (subj->pos > 0 && (isalnum(gh_buf_at(subj->buffer, subj->pos - 1)) ||
+ gh_buf_at(subj->buffer, subj->pos - 1) == '_')) {
+ goto text_literal;
+ }
+
+ new = handle_strong_emph(subj, '_');
+ break;
+ case '*':
+ new = handle_strong_emph(subj, '*');
+ break;
+ case '[':
+ new = handle_left_bracket(subj);
+ break;
+ case '!':
+ advance(subj);
+ if (peek_char(subj) == '[') {
+ new = handle_left_bracket(subj);
+ if (new != NULL && new->tag == link) {
+ new->tag = image;
+ } else {
+ new = append_inlines(make_str(chunk_literal("!")), new);
+ }
+ } else {
+ new = make_str(chunk_literal("!"));
+ }
+ break;
+ default:
+ text_literal:
+ endpos = find_special_char(subj);
+ if (endpos < 0) {
+ endpos = gh_buf_len(subj->buffer);
+ }
+
+ contents = chunk_buf(subj->buffer, subj->pos, endpos - subj->pos);
+ subj->pos = endpos;
+
+ // if we're at a newline, strip trailing spaces.
+ if (peek_char(subj) == '\n') {
+ chunk_trim(&contents);
+ }
+
+ new = make_str(contents);
+ }
+ if (*last == NULL) {
+ *last = new;
+ } else {
+ append_inlines(*last, new);
+ }
+ return 1;
+}
+
+extern inl* parse_inlines(gh_buf *input, int input_pos, reference** refmap)
+{
+ subject subj;
+ init_subject(&subj, input, input_pos, refmap);
+ return parse_inlines_while(&subj, not_eof);
}
// Parse zero or more space characters, including at most one newline.
void spnl(subject* subj)
{
- bool seen_newline = false;
- while (peek_char(subj) == ' ' ||
- (!seen_newline &&
- (seen_newline = peek_char(subj) == '\n'))) {
- advance(subj);
- }
+ bool seen_newline = false;
+ while (peek_char(subj) == ' ' ||
+ (!seen_newline &&
+ (seen_newline = peek_char(subj) == '\n'))) {
+ advance(subj);
+ }
}
// Parse reference. Assumes string begins with '[' character.
// Modify refmap if a reference is encountered.
// Return 0 if no reference found, otherwise position of subject
// after reference is parsed.
-extern int parse_reference(bstring input, reference** refmap)
-{
- subject * subj = make_subject(input, NULL);
- bstring lab = NULL;
- bstring url = NULL;
- bstring title = NULL;
- int matchlen = 0;
- int beforetitle;
- reference * new = NULL;
- int newpos;
-
- // parse label:
- if (!link_label(subj, &lab)) {
- free(subj);
- return 0;
- }
- // colon:
- if (peek_char(subj) == ':') {
- advance(subj);
- } else {
- free(subj);
- bdestroy(lab);
- return 0;
- }
- // parse link url:
- spnl(subj);
- matchlen = scan_link_url(subj->buffer, subj->pos);
- if (matchlen) {
- url = bmidstr(subj->buffer, subj->pos, matchlen);
- clean_url(url);
- subj->pos += matchlen;
- } else {
- free(subj);
- bdestroy(lab);
- bdestroy(url);
- return 0;
- }
- // parse optional link_title
- beforetitle = subj->pos;
- spnl(subj);
- matchlen = scan_link_title(subj->buffer, subj->pos);
- if (matchlen) {
- title = bmidstr(subj->buffer, subj->pos, matchlen);
- clean_title(title);
- subj->pos += matchlen;
- } else {
- subj->pos = beforetitle;
- title = bfromcstr("");
- }
- // parse final spaces and newline:
- while (peek_char(subj) == ' ') {
- advance(subj);
- }
- if (peek_char(subj) == '\n') {
- advance(subj);
- } else if (peek_char(subj) != 0) {
- free(subj);
- bdestroy(lab);
- bdestroy(url);
- bdestroy(title);
- return 0;
- }
- // insert reference into refmap
- new = make_reference(lab, url, title);
- add_reference(refmap, new);
-
- newpos = subj->pos;
- free(subj);
- bdestroy(lab);
- bdestroy(url);
- bdestroy(title);
- return newpos;
+extern int parse_reference(gh_buf *input, int input_pos, reference** refmap)
+{
+ subject subj;
+
+ chunk lab;
+ chunk url;
+ chunk title;
+
+ int matchlen = 0;
+ int beforetitle;
+ reference * new = NULL;
+
+ init_subject(&subj, input, input_pos, NULL);
+
+ // parse label:
+ if (!link_label(&subj, &lab))
+ return 0;
+
+ // colon:
+ if (peek_char(&subj) == ':') {
+ advance(&subj);
+ } else {
+ return 0;
+ }
+
+ // parse link url:
+ spnl(&subj);
+ matchlen = scan_link_url(subj.buffer, subj.pos);
+ if (matchlen) {
+ url = chunk_buf(subj.buffer, subj.pos, matchlen);
+ subj.pos += matchlen;
+ } else {
+ return 0;
+ }
+
+ // parse optional link_title
+ beforetitle = subj.pos;
+ spnl(&subj);
+ matchlen = scan_link_title(subj.buffer, subj.pos);
+ if (matchlen) {
+ title = chunk_buf(subj.buffer, subj.pos, matchlen);
+ subj.pos += matchlen;
+ } else {
+ subj.pos = beforetitle;
+ title = chunk_literal("");
+ }
+ // parse final spaces and newline:
+ while (peek_char(&subj) == ' ') {
+ advance(&subj);
+ }
+ if (peek_char(&subj) == '\n') {
+ advance(&subj);
+ } else if (peek_char(&subj) != 0) {
+ return 0;
+ }
+ // insert reference into refmap
+ new = make_reference(&lab, &url, &title);
+ add_reference(refmap, new);
+
+ return subj.pos;
}
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-23 00:04:18 +0000