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// MIT License, Copyright (c) 2020 Marvin Borner
// HTML parsing is mainly based on the XML parser
#include <assert.h>
#include <libgui/gui.h>
#include <libtxt/html.h>
#include <libtxt/xml.h>
#include <list.h>
#include <mem.h>
#include <print.h>
#include <str.h>
static int is_self_closing(const char *tag)
{
const char *void_elements[] = { "area", "base", "br", "col", "embed", "hr", "img",
"input", "link", "meta", "param", "source", "track", "wbr" };
for (u32 i = 0; i < sizeof(void_elements) / sizeof(void_elements[0]); ++i) {
if (!strcmp(void_elements[i], tag))
return 1;
}
return 0;
}
static char *normalize_tag_name(char *tag)
{
for (char *p = tag; *p; ++p)
*p = *p > 0x40 && *p < 0x5b ? *p | 0x60 : *p;
return tag;
}
static struct dom *new_object(const char *tag, struct dom *parent)
{
struct dom *object = malloc(sizeof(*object));
object->tag = strdup(tag);
object->parent = parent;
object->content = NULL;
object->children = list_new();
return object;
}
static void print_dom(struct dom *dom, u32 level)
{
struct node *iterator = dom->children->head;
while (iterator != NULL) {
struct dom *obj = iterator->data;
for (u32 i = 0; i < level; i++)
print("\t");
printf("'%s': '%s'\n", obj->tag, obj->content ? obj->content : "");
if (obj->children->head)
print_dom(obj, level + 1);
iterator = iterator->next;
}
}
static struct dom *generate_dom(char *data, u32 length)
{
struct xml_token tokens[128];
struct xml parser;
xml_init(&parser);
void *buffer = data;
enum xml_error error = xml_parse(&parser, buffer, length, tokens, 128);
if (error != XML_SUCCESS && error != XML_ERROR_BUFFERDRY) {
printf("XML parse error: %d\n", err);
printf("DATA: '%s'\n", data);
return NULL;
}
struct dom *root = new_object("root", NULL);
struct dom *current = root;
static char name[256] = { 0 };
for (u32 i = 0; i < parser.ntokens; i++) {
const struct xml_token *token = tokens + i;
name[0] = '\0';
switch (token->type) {
case XML_START_TAG:
memcpy(&name, (u8 *)buffer + token->start_pos,
token->end_pos - token->start_pos);
name[token->end_pos - token->start_pos] = '\0';
normalize_tag_name(name);
current = new_object(name, current);
printf("Adding %s to %s\n", current->tag, current->parent->tag);
list_add(current->parent->children, current);
if (is_self_closing(name))
current = current->parent;
break;
case XML_END_TAG:
memcpy(&name, (u8 *)buffer + token->start_pos,
token->end_pos - token->start_pos);
name[token->end_pos - token->start_pos] = '\0';
normalize_tag_name(name);
if (is_self_closing(name))
break;
if (!current || !current->parent || strcmp(name, current->tag))
return NULL;
current = current->parent;
break;
case XML_CHARACTER:
if (!current)
continue;
if (token->end_pos == token->start_pos + 2) {
const char *ptr = (char *)buffer + token->start_pos;
if (ptr[0] == '\r' && ptr[1] == '\n')
continue;
}
memcpy(&name, (u8 *)buffer + token->start_pos,
token->end_pos - token->start_pos);
name[token->end_pos - token->start_pos] = '\0';
char *clean_name = name;
for (char *p = name; *p; p++) {
if (*p == ' ' || *p == '\n' || *p == '\r' || *p == '\t') {
clean_name++;
} else {
break;
}
}
if (!strlen(clean_name))
break;
current->content = strdup(clean_name);
break;
default:
break;
}
i += token->size;
}
assert(root);
print("GENERATED!\n");
print_dom(root, 0);
return root;
}
static struct html_element *new_html_element(struct element *container, struct dom *dom)
{
struct html_element *elem = malloc(sizeof(*elem));
elem->x_offset = 0;
elem->y_offset = 0;
elem->dom = dom;
elem->obj = container;
return elem;
}
// TODO: Better structure?
// TODO: Less code duplication (e.g. for headings)
#define CMP(tag, tag_string) (!strcmp((tag), (tag_string)))
static struct html_element *render_object(struct html_element *container, struct dom *dom)
{
char *tag = dom->tag;
assert(container);
if (CMP(tag, "html")) {
struct element *obj =
gui_add_container(container->obj, 0, 0, 100, 100, COLOR_WHITE);
return new_html_element(obj, dom);
} else if (CMP(tag, "body")) {
struct element *obj =
gui_add_container(container->obj, 0, 0, 100, 100, COLOR_WHITE);
return new_html_element(obj, dom);
} else if (CMP(tag, "h1")) {
struct element *obj =
gui_add_label(container->obj, container->x_offset, container->y_offset,
FONT_32, dom->content, COLOR_WHITE, COLOR_BLACK);
container->x_offset = 0;
container->y_offset += obj->ctx->size.y;
return new_html_element(obj, dom);
} else if (CMP(tag, "h2")) {
struct element *obj =
gui_add_label(container->obj, container->x_offset, container->y_offset,
FONT_24, dom->content, COLOR_WHITE, COLOR_BLACK);
container->x_offset = 0;
container->y_offset += obj->ctx->size.y;
return new_html_element(obj, dom);
} else if (CMP(tag, "h3")) {
struct element *obj =
gui_add_label(container->obj, container->x_offset, container->y_offset,
FONT_16, dom->content, COLOR_WHITE, COLOR_BLACK);
container->x_offset = 0;
container->y_offset += obj->ctx->size.y;
return new_html_element(obj, dom);
} else if (CMP(tag, "p")) {
struct element *obj =
gui_add_label(container->obj, container->x_offset, container->y_offset,
FONT_16, dom->content, COLOR_WHITE, COLOR_BLACK);
container->x_offset = 0;
container->y_offset += obj->ctx->size.y;
return new_html_element(obj, dom);
} else if (CMP(tag, "hr")) {
gfx_draw_rectangle(container->obj->ctx,
vec2(container->x_offset, container->y_offset),
vec2(container->obj->ctx->size.x - container->x_offset,
container->y_offset + 2),
COLOR_BLACK);
container->x_offset = 0;
container->y_offset += 2;
return container;
} else if (CMP(tag, "head") || CMP(tag, "meta") || CMP(tag, "title")) {
return container;
} else {
printf("UNKNOWN %s\n", tag);
if (dom->content && strlen(dom->content) > 0) {
struct element *obj = gui_add_label(container->obj, container->x_offset,
container->y_offset, FONT_16,
dom->content, COLOR_WHITE, COLOR_BLACK);
container->x_offset = 0;
container->y_offset += obj->ctx->size.y;
return new_html_element(obj, dom);
}
return container;
}
}
int html_render_dom(struct html_element *container, struct dom *dom)
{
struct node *iterator = dom->children->head;
while (iterator != NULL) {
struct dom *obj = iterator->data;
struct html_element *rendered = render_object(container, obj);
if (obj->children->head && rendered)
html_render_dom(rendered, obj);
iterator = iterator->next;
}
return 1;
}
int html_render(struct element *container, char *data, u32 length)
{
struct dom *dom = generate_dom(data, length);
struct html_element *obj = new_html_element(container, dom);
return dom && obj && html_render_dom(obj, dom);
}
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