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v/vlib/net/html/dom.v

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module html
import os
pub struct DocumentObjectModel {
mut:
root &Tag
constructed bool
btree BTree
all_tags []&Tag
all_attributes map[string][]&Tag
close_tags map[string]bool // add a counter to see count how many times is closed and parse correctly
attributes map[string][]string
tag_attributes map[string][][]&Tag
tag_type map[string][]&Tag
debug_file os.File
}
[if debug]
fn (mut dom DocumentObjectModel) print_debug(data string) {
$if debug {
if data.len > 0 {
dom.debug_file.writeln(data)
}
}
}
/*
fn (dom mut DocumentObjectModel) new_root(tag &Tag) {
mut new_tag := &Tag{} new_tag.name = "div"
new_tag.add_child(dom.root) new_tag.add_child(tag)
dom.root = new_tag
}
*/
fn is_close_tag(tag &Tag) bool {
if tag.name.len > 0 {
return tag.name[0] == 47 // return if equals to /
}
return false
}
fn (mut dom DocumentObjectModel) where_is(item_name string, attribute_name string) int {
if !(attribute_name in dom.attributes) {
temp_array := []string{}
dom.attributes[attribute_name] = temp_array
}
mut string_array := dom.attributes[attribute_name]
mut counter := 0
for value in string_array {
if value == item_name {
return counter
}
counter++
}
string_array << item_name
dom.attributes[attribute_name] = string_array
return string_array.len - 1
}
fn (mut dom DocumentObjectModel) add_tag_attribute(tag &Tag) {
for attribute_name in tag.attributes.keys() {
attribute_value := tag.attributes[attribute_name]
location := dom.where_is(attribute_value, attribute_name)
if !(attribute_name in dom.tag_attributes) {
dom.tag_attributes[attribute_name] = []
}
for {
mut temp_array := dom.tag_attributes[attribute_name]
temp_array << []&Tag{}
dom.tag_attributes[attribute_name] = temp_array
if location < dom.tag_attributes[attribute_name].len + 1 {
break
}
}
mut temp_array := dom.tag_attributes[attribute_name][location]
temp_array << tag
dom.tag_attributes[attribute_name][location] = temp_array
}
}
fn (mut dom DocumentObjectModel) add_tag_by_type(tag &Tag) {
tag_name := tag.name
if !(tag_name in dom.tag_type) {
dom.tag_type[tag_name] = [tag]
} else {
mut temp_array := dom.tag_type[tag_name]
temp_array << tag
dom.tag_type[tag_name] = temp_array
}
}
fn (mut dom DocumentObjectModel) add_tag_by_attribute(tag &Tag) {
for attribute_name in tag.attributes.keys() {
if !(attribute_name in dom.all_attributes) {
dom.all_attributes[attribute_name] = [tag]
} else {
mut temp_array := dom.all_attributes[attribute_name]
temp_array << tag
dom.all_attributes[attribute_name] = temp_array
}
}
}
fn compare_string(a string, b string) bool { // for some reason == doesn't work
if a.len != b.len {
return false
}
for i := 0; i < a.len; i++ {
if a[i] != b[i] {
return false
}
}
return true
}
fn (mut dom DocumentObjectModel) construct(tag_list []&Tag) {
dom.constructed = true
mut temp_map := map[string]int{}
mut temp_int := C.INT_MIN
mut temp_string := ''
mut stack := Stack{}
dom.btree = BTree{}
dom.root = tag_list[0]
dom.all_tags = [tag_list[0]]
temp_map['0'] = dom.btree.add_children(tag_list[0])
stack.push(0)
root_index := 0
for index := 1; index < tag_list.len; index++ {
mut tag := tag_list[index]
dom.print_debug(tag.str())
if is_close_tag(tag) {
temp_int = stack.peek()
temp_string = tag.name[1..tag.name.len] // print(temp_string + " != " + tag_list[temp_int].name + " >> ") // println(temp_string != tag_list[temp_int].name)
for !stack.is_null(temp_int) &&
!compare_string(temp_string, tag_list[temp_int].name) && !tag_list[temp_int].closed {
dom.print_debug(temp_string + ' >> ' + tag_list[temp_int].name + ' ' +
compare_string(temp_string, tag_list[temp_int].name).str())
stack.pop()
temp_int = stack.peek()
}
temp_int = stack.peek()
if !stack.is_null(temp_int) {
temp_int = stack.pop()
} else {
temp_int = root_index
}
if stack.is_null(temp_int) {
stack.push(root_index)
}
dom.print_debug('Removed ' + temp_string + ' -- ' + tag_list[temp_int].name)
} else if tag.name.len > 0 {
dom.add_tag_attribute(tag) // error here
dom.add_tag_by_attribute(tag)
dom.add_tag_by_type(tag)
dom.all_tags << tag
temp_int = stack.peek()
if !stack.is_null(temp_int) {
dom.btree.move_pointer(temp_map[temp_int.str()])
temp_map[index.str()] = dom.btree.add_children(tag)
mut temp_tag := tag_list[temp_int]
position_in_parent := temp_tag.add_child(tag) // tag_list[temp_int] = temp_tag
tag.add_parent(temp_tag, position_in_parent)
/*
dom.print_debug("Added ${tag.name} as child of '" + tag_list[temp_int].name +
"' which now has ${dom.btree.get_children().len} childrens")
*/
dom.print_debug("Added $tag.name as child of '" + temp_tag.name +
"' which now has $temp_tag.get_children().len childrens")
} else { // dom.new_root(tag)
stack.push(root_index)
}
temp_string = '/' + tag.name
if temp_string in dom.close_tags && !tag.closed { // if tag ends with />
dom.print_debug('Pushed ' + temp_string)
stack.push(index)
}
}
} // println(tag_list[root_index]) for debug purposes
dom.root = tag_list[0]
}
pub fn (mut dom DocumentObjectModel) get_by_attribute_value(name string, value string) []&Tag {
location := dom.where_is(value, name)
if dom.tag_attributes[name].len > location {
return dom.tag_attributes[name][location]
}
return []&Tag{}
}
pub fn (dom DocumentObjectModel) get_by_tag(name string) []&Tag {
if name in dom.tag_type {
return dom.tag_type[name]
}
return []&Tag{}
}
pub fn (dom DocumentObjectModel) get_by_attribute(name string) []&Tag {
if name in dom.all_attributes {
return dom.all_attributes[name]
}
return []&Tag{}
}
pub fn (dom DocumentObjectModel) get_root() &Tag {
return dom.root
}
pub fn (dom DocumentObjectModel) get_all_tags() []&Tag {
return dom.all_tags
}
/*
pub fn (dom DocumentObjectModel) get_xpath() XPath {
return XPath{
dom: dom
}
}
*/