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v/vlib/net/html/README.md
2020-12-06 05:11:43 +01:00

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# V HTML
A HTML parser made in V.
## Usage
If the description below isn't enought, please look at the test files.
### Parser
Responsible for read HTML in full strings or splited string and returns all Tag objets of
it HTML or return a DocumentObjectModel, that will try to find how the HTML Tree is.
#### split_parse(data string)
This functions is the main function called by parse method to fragment parse your HTML.
#### parse_html(data string, is_file bool)
This function is called passing a filename or a complete html data string to it.
#### add_code_tag(name string)
This function is used to add a tag for the parser ignore it's content.
For example, if you have an html or XML with a custom tag, like `<script>`, using this function,
like `add_code_tag('script')` will make all `script` tags content be jumped,
so you still have its content, but will not confuse the parser with it's `>` or `<`.
#### finalize()
When using **split_parse** method, you must call this function to ends the parse completely.
#### get_tags() []Tag_ptr
This functions returns a array with all tags and it's content.
#### get_dom() DocumentObjectModel
Returns the DocumentObjectModel for current parsed tags.
### WARNING
If you want to reuse parser object to parse another HTML, call `initialize_all()` function first.
### DocumentObjectModel
A DOM object that will make easier to access some tags and search it.
#### get_by_attribute_value(name string, value string) []Tag_ptr
This function retuns a Tag array with all tags in document
that have a attribute with given name and given value.
#### get_by_tag(name string) []Tag_ptr
This function retuns a Tag array with all tags in document that have a name with the given value.
#### get_by_attribute(name string) []Tag_ptr
This function retuns a Tag array with all tags in document that have a attribute with given name.
#### get_root() Tag_ptr
This function returns the root Tag.
#### get_all_tags() []Tag_ptr
This function returns all important tags, removing close tags.
### Tag
An object that holds tags information, such as `name`, `attributes`, `children`.
#### get_children() []Tag_ptr
Returns all children as an array.
#### get_parent() &Tag
Returns the parent of current tag.
#### get_name() string
Returns tag name.
#### get_content() string
Returns tag content.
#### get_attributes() map[string]string
Returns all attributes and it value.
#### text() string
Returns the content of the tag and all tags inside it.
Also, any `<br>` tag will be converted into `\n`.
## Some questions that can appear
### Q: Why in parser have a `builder_str() string` method that returns only the lexeme string?
A: Because in early stages of the project, `strings.Builder` are used,
but for some bug existing somewhere, it was necessary to use `string` directly.
Later, it's planned to use `strings.Builder` again.
### Q: Why have a `compare_string(a string, b string) bool` method?
A: For some reason when using != and == in strings directly, it is not working.
So this method is a workaround.
### Q: Will be something like `XPath`?
A: Like XPath yes. Exactly equal to it, no.
## Roadmap
- [x] Parser
- [x] `<!-- Comments -->` detection
- [x] `Open Generic tags` detection
- [x] `Close Generic tags` detection
- [x] `verify string` detection
- [x] `tag attributes` detection
- [x] `attributes values` detection
- [x] `tag text` (on tag it is declared as content, maybe change for text in the future)
- [x] `text file for parse` support (open local files for parsing)
- [x] `open_code` verification
- [x] DocumentObjectModel
- [x] push elements that have a close tag into stack
- [x] remove elements from stack
- [x] ~~create a new document root if have some syntax error (deleted)~~
- [x] search tags in `DOM` by attributes
- [x] search tags in `DOM` by tag type
- [x] finish dom test
## License
[MIT](../../../LICENSE)