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#LuaRock "htmlparser" # LuaRock "htmlparser"
Parse HTML text into a tree of elements with selectors Parse HTML text into a tree of elements with selectors
[1]: http://wscherphof.github.com/lua-set/ [1]: http://wscherphof.github.com/lua-set/
[2]: http://api.jquery.com/category/selectors/ [2]: http://api.jquery.com/category/selectors/
##Install ## Install
Htmlparser is a listed [LuaRock](http://luarocks.org/repositories/rocks/). Install using [LuaRocks](http://www.luarocks.org/): `luarocks install htmlparser` Htmlparser is a listed [LuaRock](http://luarocks.org/repositories/rocks/). Install using [LuaRocks](http://www.luarocks.org/): `luarocks install htmlparser`
###Dependencies ### Dependencies
Htmlparser depends on [Lua 5.2](http://www.lua.org/download.html) (while work with LuaJIT, which provides 5.1-compatible ABI), and on the ["lua-set"][1] package, which is installed along automatically. To be able to run the tests, [lunitx](https://github.com/dcurrie/lunit) also comes along as a LuaRock Htmlparser depends on [Lua 5.2](http://www.lua.org/download.html) (while work with LuaJIT, which provides 5.1-compatible ABI), and on the ["lua-set"][1] package, which is installed along automatically. To be able to run the tests, [lunitx](https://github.com/dcurrie/lunit) also comes along as a LuaRock
##Usage ## Usage
Start off with Start off with
```lua ```lua
pcall(require, "luarocks.loader") pcall(require, "luarocks.loader")
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``` ```
The root element is a container for the top level elements in the parsed text, i.e. the `<html>` element in a parsed html document would be a child of the returned root element. The root element is a container for the top level elements in the parsed text, i.e. the `<html>` element in a parsed html document would be a child of the returned root element.
##Selectors ## Selectors
Supported selectors are a subset of [jQuery's selectors][2]: Supported selectors are a subset of [jQuery's selectors][2]:
- `"*"` all contained elements - `"*"` all contained elements
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Selectors can be combined; e.g. `".class:not([attribute]) element.class"` Selectors can be combined; e.g. `".class:not([attribute]) element.class"`
##Element type ## Element type
All tree elements provide, apart from `:select` and `()`, the following accessors: All tree elements provide, apart from `:select` and `()`, the following accessors:
###Basic ### Basic
- `.name` the element's tagname - `.name` the element's tagname
- `.attributes` a table with keys and values for the element's attributes; `{}` if none - `.attributes` a table with keys and values for the element's attributes; `{}` if none
- `.id` the value of the element's id attribute; `nil` if not present - `.id` the value of the element's id attribute; `nil` if not present
@ -75,7 +75,7 @@ All tree elements provide, apart from `:select` and `()`, the following accessor
- `.nodes` an array with the element's child elements, `{}` if none - `.nodes` an array with the element's child elements, `{}` if none
- `.parent` the element that contains this element; `root.parent` is `nil` - `.parent` the element that contains this element; `root.parent` is `nil`
###Other ### Other
- `.index` sequence number of elements in order of appearance; root index is `0` - `.index` sequence number of elements in order of appearance; root index is `0`
- `:gettext()` the complete element text, starting with `"<tagname"` and ending with `"/>"` or `"</tagname>"` - `:gettext()` the complete element text, starting with `"<tagname"` and ending with `"/>"` or `"</tagname>"`
- `.level` how deep the element is in the tree; root level is `0` - `.level` how deep the element is in the tree; root level is `0`
@ -86,7 +86,7 @@ All tree elements provide, apart from `:select` and `()`, the following accessor
- `.deeperids` as `.deeperelements`, but keyed on id value - `.deeperids` as `.deeperelements`, but keyed on id value
- `.deeperclasses` as `.deeperelements`, but keyed on class name - `.deeperclasses` as `.deeperelements`, but keyed on class name
##Limitations ## Limitations
- Attribute values in selector strings cannot contain any spaces - Attribute values in selector strings cannot contain any spaces
- The spaces before and after the `>` in a `parent > child` relation are mandatory - The spaces before and after the `>` in a `parent > child` relation are mandatory
- `<!` elements (including doctype, comments, and CDATA) are not parsed; markup within CDATA is *not* escaped - `<!` elements (including doctype, comments, and CDATA) are not parsed; markup within CDATA is *not* escaped
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- No start or end tags are implied when [omitted](http://www.w3.org/TR/html5/syntax.html#optional-tags). Only the [void elements](http://www.w3.org/TR/html5/syntax.html#void-elements) should not have an end tag - No start or end tags are implied when [omitted](http://www.w3.org/TR/html5/syntax.html#optional-tags). Only the [void elements](http://www.w3.org/TR/html5/syntax.html#void-elements) should not have an end tag
- No validation is done for tag or attribute names or nesting of element types. The list of void elements is in fact the only part specific to HTML - No validation is done for tag or attribute names or nesting of element types. The list of void elements is in fact the only part specific to HTML
##Examples ## Examples
See `./doc/sample.lua` See `./doc/sample.lua`
##Tests ## Tests
See `./tst/init.lua` See `./tst/init.lua`
##License ## License
LGPL+; see `./doc/LICENSE` LGPL+; see `./doc/LICENSE`