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Copy pathnode.c
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888 lines (744 loc) · 17.4 KB
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#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include "node.h"
static void S_node_unlink(cmark_node *node);
bool cmark_node_is_block(cmark_node *node) {
if (node == NULL) {
return false;
}
return node->type >= CMARK_NODE_FIRST_BLOCK &&
node->type <= CMARK_NODE_LAST_BLOCK;
}
bool cmark_node_is_inline(cmark_node *node) {
if (node == NULL) {
return false;
}
return node->type >= CMARK_NODE_FIRST_INLINE &&
node->type <= CMARK_NODE_LAST_INLINE;
}
bool cmark_node_is_leaf(cmark_node *node) {
if (node == NULL) {
return false;
}
switch (node->type) {
case CMARK_NODE_THEMATIC_BREAK: return true;
case CMARK_NODE_CODE_BLOCK : return true;
case CMARK_NODE_TEXT : return true;
case CMARK_NODE_SOFTBREAK : return true;
case CMARK_NODE_LINEBREAK : return true;
case CMARK_NODE_CODE : return true;
case CMARK_NODE_HTML_INLINE: return true;
}
return false;
}
static bool S_can_contain(cmark_node *node, cmark_node *child) {
if (node == NULL || child == NULL || node == child) {
return false;
}
// Verify that child is not an ancestor of node.
if (child->first_child != NULL) {
cmark_node *cur = node->parent;
while (cur != NULL) {
if (cur == child) {
return false;
}
cur = cur->parent;
}
}
if (child->type == CMARK_NODE_DOCUMENT) {
return false;
}
switch (node->type) {
case CMARK_NODE_DOCUMENT:
case CMARK_NODE_BLOCK_QUOTE:
case CMARK_NODE_ITEM:
return cmark_node_is_block(child) && child->type != CMARK_NODE_ITEM;
case CMARK_NODE_LIST:
return child->type == CMARK_NODE_ITEM;
case CMARK_NODE_CUSTOM_BLOCK:
return true;
case CMARK_NODE_PARAGRAPH:
case CMARK_NODE_HEADING:
case CMARK_NODE_EMPH:
case CMARK_NODE_STRONG:
case CMARK_NODE_LINK:
case CMARK_NODE_IMAGE:
case CMARK_NODE_CUSTOM_INLINE:
return cmark_node_is_inline(child);
default:
break;
}
return false;
}
cmark_node *cmark_node_new_with_mem(cmark_node_type type, cmark_mem *mem) {
cmark_node *node = (cmark_node *)mem->calloc(1, sizeof(*node));
node->mem = mem;
node->type = (uint16_t)type;
switch (node->type) {
case CMARK_NODE_HEADING:
node->as.heading.level = 1;
break;
case CMARK_NODE_LIST: {
cmark_list *list = &node->as.list;
list->list_type = CMARK_BULLET_LIST;
list->start = 0;
list->tight = false;
break;
}
default:
break;
}
return node;
}
cmark_node *cmark_node_new(cmark_node_type type) {
extern cmark_mem DEFAULT_MEM_ALLOCATOR;
return cmark_node_new_with_mem(type, &DEFAULT_MEM_ALLOCATOR);
}
// Free a cmark_node list and any children.
static void S_free_nodes(cmark_node *e) {
cmark_mem *mem = e->mem;
cmark_node *next;
while (e != NULL) {
switch (e->type) {
case CMARK_NODE_CODE_BLOCK:
mem->free(e->data);
mem->free(e->as.code.info);
break;
case CMARK_NODE_TEXT:
case CMARK_NODE_HTML_INLINE:
case CMARK_NODE_CODE:
case CMARK_NODE_HTML_BLOCK:
mem->free(e->data);
break;
case CMARK_NODE_LINK:
case CMARK_NODE_IMAGE:
mem->free(e->as.link.url);
mem->free(e->as.link.title);
break;
case CMARK_NODE_CUSTOM_BLOCK:
case CMARK_NODE_CUSTOM_INLINE:
mem->free(e->as.custom.on_enter);
mem->free(e->as.custom.on_exit);
break;
default:
break;
}
if (e->last_child) {
// Splice children into list
e->last_child->next = e->next;
e->next = e->first_child;
}
next = e->next;
mem->free(e);
e = next;
}
}
void cmark_node_free(cmark_node *node) {
S_node_unlink(node);
node->next = NULL;
S_free_nodes(node);
}
cmark_node_type cmark_node_get_type(cmark_node *node) {
if (node == NULL) {
return CMARK_NODE_NONE;
} else {
return (cmark_node_type)node->type;
}
}
const char *cmark_node_get_type_string(cmark_node *node) {
if (node == NULL) {
return "NONE";
}
switch (node->type) {
case CMARK_NODE_NONE:
return "none";
case CMARK_NODE_DOCUMENT:
return "document";
case CMARK_NODE_BLOCK_QUOTE:
return "block_quote";
case CMARK_NODE_LIST:
return "list";
case CMARK_NODE_ITEM:
return "item";
case CMARK_NODE_CODE_BLOCK:
return "code_block";
case CMARK_NODE_HTML_BLOCK:
return "html_block";
case CMARK_NODE_CUSTOM_BLOCK:
return "custom_block";
case CMARK_NODE_PARAGRAPH:
return "paragraph";
case CMARK_NODE_HEADING:
return "heading";
case CMARK_NODE_THEMATIC_BREAK:
return "thematic_break";
case CMARK_NODE_TEXT:
return "text";
case CMARK_NODE_SOFTBREAK:
return "softbreak";
case CMARK_NODE_LINEBREAK:
return "linebreak";
case CMARK_NODE_CODE:
return "code";
case CMARK_NODE_HTML_INLINE:
return "html_inline";
case CMARK_NODE_CUSTOM_INLINE:
return "custom_inline";
case CMARK_NODE_EMPH:
return "emph";
case CMARK_NODE_STRONG:
return "strong";
case CMARK_NODE_LINK:
return "link";
case CMARK_NODE_IMAGE:
return "image";
}
return "<unknown>";
}
cmark_node *cmark_node_next(cmark_node *node) {
if (node == NULL) {
return NULL;
} else {
return node->next;
}
}
cmark_node *cmark_node_previous(cmark_node *node) {
if (node == NULL) {
return NULL;
} else {
return node->prev;
}
}
cmark_node *cmark_node_parent(cmark_node *node) {
if (node == NULL) {
return NULL;
} else {
return node->parent;
}
}
cmark_node *cmark_node_first_child(cmark_node *node) {
if (node == NULL) {
return NULL;
} else {
return node->first_child;
}
}
cmark_node *cmark_node_last_child(cmark_node *node) {
if (node == NULL) {
return NULL;
} else {
return node->last_child;
}
}
static bufsize_t cmark_set_cstr(cmark_mem *mem, unsigned char **dst,
const char *src) {
unsigned char *old = *dst;
bufsize_t len;
if (src && src[0]) {
len = (bufsize_t)strlen(src);
*dst = (unsigned char *)mem->realloc(NULL, len + 1);
memcpy(*dst, src, len + 1);
} else {
len = 0;
*dst = NULL;
}
if (old) {
mem->free(old);
}
return len;
}
void *cmark_node_get_user_data(cmark_node *node) {
if (node == NULL) {
return NULL;
} else {
return node->user_data;
}
}
int cmark_node_set_user_data(cmark_node *node, void *user_data) {
if (node == NULL) {
return 0;
}
node->user_data = user_data;
return 1;
}
const char *cmark_node_get_literal(cmark_node *node) {
if (node == NULL) {
return NULL;
}
switch (node->type) {
case CMARK_NODE_HTML_BLOCK:
case CMARK_NODE_TEXT:
case CMARK_NODE_HTML_INLINE:
case CMARK_NODE_CODE:
case CMARK_NODE_CODE_BLOCK:
return node->data ? (char *)node->data : "";
default:
break;
}
return NULL;
}
int cmark_node_set_literal(cmark_node *node, const char *content) {
if (node == NULL) {
return 0;
}
switch (node->type) {
case CMARK_NODE_HTML_BLOCK:
case CMARK_NODE_TEXT:
case CMARK_NODE_HTML_INLINE:
case CMARK_NODE_CODE:
case CMARK_NODE_CODE_BLOCK:
node->len = cmark_set_cstr(node->mem, &node->data, content);
return 1;
default:
break;
}
return 0;
}
int cmark_node_get_heading_level(cmark_node *node) {
if (node == NULL) {
return 0;
}
switch (node->type) {
case CMARK_NODE_HEADING:
return node->as.heading.level;
default:
break;
}
return 0;
}
int cmark_node_set_heading_level(cmark_node *node, int level) {
if (node == NULL || level < 1 || level > 6) {
return 0;
}
switch (node->type) {
case CMARK_NODE_HEADING:
node->as.heading.level = level;
return 1;
default:
break;
}
return 0;
}
cmark_list_type cmark_node_get_list_type(cmark_node *node) {
if (node == NULL) {
return CMARK_NO_LIST;
}
if (node->type == CMARK_NODE_LIST) {
return (cmark_list_type)node->as.list.list_type;
} else {
return CMARK_NO_LIST;
}
}
int cmark_node_set_list_type(cmark_node *node, cmark_list_type type) {
if (!(type == CMARK_BULLET_LIST || type == CMARK_ORDERED_LIST)) {
return 0;
}
if (node == NULL) {
return 0;
}
if (node->type == CMARK_NODE_LIST) {
node->as.list.list_type = (unsigned char)type;
return 1;
} else {
return 0;
}
}
cmark_delim_type cmark_node_get_list_delim(cmark_node *node) {
if (node == NULL) {
return CMARK_NO_DELIM;
}
if (node->type == CMARK_NODE_LIST) {
return (cmark_delim_type)node->as.list.delimiter;
} else {
return CMARK_NO_DELIM;
}
}
int cmark_node_set_list_delim(cmark_node *node, cmark_delim_type delim) {
if (!(delim == CMARK_PERIOD_DELIM || delim == CMARK_PAREN_DELIM)) {
return 0;
}
if (node == NULL) {
return 0;
}
if (node->type == CMARK_NODE_LIST) {
node->as.list.delimiter = (unsigned char)delim;
return 1;
} else {
return 0;
}
}
int cmark_node_get_list_start(cmark_node *node) {
if (node == NULL) {
return 0;
}
if (node->type == CMARK_NODE_LIST) {
return node->as.list.start;
} else {
return 0;
}
}
int cmark_node_set_list_start(cmark_node *node, int start) {
if (node == NULL || start < 0) {
return 0;
}
if (node->type == CMARK_NODE_LIST) {
node->as.list.start = start;
return 1;
} else {
return 0;
}
}
int cmark_node_get_list_tight(cmark_node *node) {
if (node == NULL) {
return 0;
}
if (node->type == CMARK_NODE_LIST) {
return node->as.list.tight;
} else {
return 0;
}
}
int cmark_node_set_list_tight(cmark_node *node, int tight) {
if (node == NULL) {
return 0;
}
if (node->type == CMARK_NODE_LIST) {
node->as.list.tight = tight == 1;
return 1;
} else {
return 0;
}
}
const char *cmark_node_get_fence_info(cmark_node *node) {
if (node == NULL) {
return NULL;
}
if (node->type == CMARK_NODE_CODE_BLOCK) {
return node->as.code.info ? (char *)node->as.code.info : "";
} else {
return NULL;
}
}
int cmark_node_set_fence_info(cmark_node *node, const char *info) {
if (node == NULL) {
return 0;
}
if (node->type == CMARK_NODE_CODE_BLOCK) {
cmark_set_cstr(node->mem, &node->as.code.info, info);
return 1;
} else {
return 0;
}
}
const char *cmark_node_get_url(cmark_node *node) {
if (node == NULL) {
return NULL;
}
switch (node->type) {
case CMARK_NODE_LINK:
case CMARK_NODE_IMAGE:
return node->as.link.url ? (char *)node->as.link.url : "";
default:
break;
}
return NULL;
}
int cmark_node_set_url(cmark_node *node, const char *url) {
if (node == NULL) {
return 0;
}
switch (node->type) {
case CMARK_NODE_LINK:
case CMARK_NODE_IMAGE:
cmark_set_cstr(node->mem, &node->as.link.url, url);
return 1;
default:
break;
}
return 0;
}
const char *cmark_node_get_title(cmark_node *node) {
if (node == NULL) {
return NULL;
}
switch (node->type) {
case CMARK_NODE_LINK:
case CMARK_NODE_IMAGE:
return node->as.link.title ? (char *)node->as.link.title : "";
default:
break;
}
return NULL;
}
int cmark_node_set_title(cmark_node *node, const char *title) {
if (node == NULL) {
return 0;
}
switch (node->type) {
case CMARK_NODE_LINK:
case CMARK_NODE_IMAGE:
cmark_set_cstr(node->mem, &node->as.link.title, title);
return 1;
default:
break;
}
return 0;
}
const char *cmark_node_get_on_enter(cmark_node *node) {
if (node == NULL) {
return NULL;
}
switch (node->type) {
case CMARK_NODE_CUSTOM_INLINE:
case CMARK_NODE_CUSTOM_BLOCK:
return node->as.custom.on_enter ? (char *)node->as.custom.on_enter : "";
default:
break;
}
return NULL;
}
int cmark_node_set_on_enter(cmark_node *node, const char *on_enter) {
if (node == NULL) {
return 0;
}
switch (node->type) {
case CMARK_NODE_CUSTOM_INLINE:
case CMARK_NODE_CUSTOM_BLOCK:
cmark_set_cstr(node->mem, &node->as.custom.on_enter, on_enter);
return 1;
default:
break;
}
return 0;
}
const char *cmark_node_get_on_exit(cmark_node *node) {
if (node == NULL) {
return NULL;
}
switch (node->type) {
case CMARK_NODE_CUSTOM_INLINE:
case CMARK_NODE_CUSTOM_BLOCK:
return node->as.custom.on_exit ? (char *)node->as.custom.on_exit : "";
default:
break;
}
return NULL;
}
int cmark_node_set_on_exit(cmark_node *node, const char *on_exit) {
if (node == NULL) {
return 0;
}
switch (node->type) {
case CMARK_NODE_CUSTOM_INLINE:
case CMARK_NODE_CUSTOM_BLOCK:
cmark_set_cstr(node->mem, &node->as.custom.on_exit, on_exit);
return 1;
default:
break;
}
return 0;
}
int cmark_node_get_start_line(cmark_node *node) {
if (node == NULL) {
return 0;
}
return node->start_line;
}
int cmark_node_get_start_column(cmark_node *node) {
if (node == NULL) {
return 0;
}
return node->start_column;
}
int cmark_node_get_end_line(cmark_node *node) {
if (node == NULL) {
return 0;
}
return node->end_line;
}
int cmark_node_get_end_column(cmark_node *node) {
if (node == NULL) {
return 0;
}
return node->end_column;
}
// Unlink a node without adjusting its next, prev, and parent pointers.
static void S_node_unlink(cmark_node *node) {
if (node == NULL) {
return;
}
if (node->prev) {
node->prev->next = node->next;
}
if (node->next) {
node->next->prev = node->prev;
}
// Adjust first_child and last_child of parent.
cmark_node *parent = node->parent;
if (parent) {
if (parent->first_child == node) {
parent->first_child = node->next;
}
if (parent->last_child == node) {
parent->last_child = node->prev;
}
}
}
void cmark_node_unlink(cmark_node *node) {
S_node_unlink(node);
node->next = NULL;
node->prev = NULL;
node->parent = NULL;
}
int cmark_node_insert_before(cmark_node *node, cmark_node *sibling) {
if (node == NULL || sibling == NULL) {
return 0;
}
if (!node->parent || !S_can_contain(node->parent, sibling)) {
return 0;
}
S_node_unlink(sibling);
cmark_node *old_prev = node->prev;
// Insert 'sibling' between 'old_prev' and 'node'.
if (old_prev) {
old_prev->next = sibling;
}
sibling->prev = old_prev;
sibling->next = node;
node->prev = sibling;
// Set new parent.
cmark_node *parent = node->parent;
sibling->parent = parent;
// Adjust first_child of parent if inserted as first child.
if (parent && !old_prev) {
parent->first_child = sibling;
}
return 1;
}
int cmark_node_insert_after(cmark_node *node, cmark_node *sibling) {
if (node == NULL || sibling == NULL) {
return 0;
}
if (!node->parent || !S_can_contain(node->parent, sibling)) {
return 0;
}
S_node_unlink(sibling);
cmark_node *old_next = node->next;
// Insert 'sibling' between 'node' and 'old_next'.
if (old_next) {
old_next->prev = sibling;
}
sibling->next = old_next;
sibling->prev = node;
node->next = sibling;
// Set new parent.
cmark_node *parent = node->parent;
sibling->parent = parent;
// Adjust last_child of parent if inserted as last child.
if (parent && !old_next) {
parent->last_child = sibling;
}
return 1;
}
int cmark_node_replace(cmark_node *oldnode, cmark_node *newnode) {
if (!cmark_node_insert_before(oldnode, newnode)) {
return 0;
}
cmark_node_unlink(oldnode);
return 1;
}
int cmark_node_prepend_child(cmark_node *node, cmark_node *child) {
if (!S_can_contain(node, child)) {
return 0;
}
S_node_unlink(child);
cmark_node *old_first_child = node->first_child;
child->next = old_first_child;
child->prev = NULL;
child->parent = node;
node->first_child = child;
if (old_first_child) {
old_first_child->prev = child;
} else {
// Also set last_child if node previously had no children.
node->last_child = child;
}
return 1;
}
int cmark_node_append_child(cmark_node *node, cmark_node *child) {
if (!S_can_contain(node, child)) {
return 0;
}
S_node_unlink(child);
cmark_node *old_last_child = node->last_child;
child->next = NULL;
child->prev = old_last_child;
child->parent = node;
node->last_child = child;
if (old_last_child) {
old_last_child->next = child;
} else {
// Also set first_child if node previously had no children.
node->first_child = child;
}
return 1;
}
static void S_print_error(FILE *out, cmark_node *node, const char *elem) {
if (out == NULL) {
return;
}
fprintf(out, "Invalid '%s' in node type %s at %d:%d\n", elem,
cmark_node_get_type_string(node), node->start_line,
node->start_column);
}
int cmark_node_check(cmark_node *node, FILE *out) {
cmark_node *cur;
int errors = 0;
if (!node) {
return 0;
}
cur = node;
for (;;) {
if (cur->first_child) {
if (cur->first_child->prev != NULL) {
S_print_error(out, cur->first_child, "prev");
cur->first_child->prev = NULL;
++errors;
}
if (cur->first_child->parent != cur) {
S_print_error(out, cur->first_child, "parent");
cur->first_child->parent = cur;
++errors;
}
cur = cur->first_child;
continue;
}
next_sibling:
if (cur == node) {
break;
}
if (cur->next) {
if (cur->next->prev != cur) {
S_print_error(out, cur->next, "prev");
cur->next->prev = cur;
++errors;
}
if (cur->next->parent != cur->parent) {
S_print_error(out, cur->next, "parent");
cur->next->parent = cur->parent;
++errors;
}
cur = cur->next;
continue;
}
if (cur->parent->last_child != cur) {
S_print_error(out, cur->parent, "last_child");
cur->parent->last_child = cur;
++errors;
}
cur = cur->parent;
goto next_sibling;
}
return errors;
}
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