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## EarmarkAstDsl
[](https://github.com/RobertDober/earmark_ast_dsl/actions)
[](https://coveralls.io/github/RobertDober/earmark_ast_dsl?branch=master)
[](https://hex.pm/packages/earmark_ast_dsl)
[](https://hex.pm/packages/earmark_ast_dsl)
[](https://hex.pm/packages/earmark_ast_dsl)
EarmarkAstDsl is a toolset to generate EarmarkParser conformant AST Nodes version 1.4.6 and on,
which is the _always return quadruples_ version.
Its main purpose is to remove boilerplate code from Earmark and
EarmarkParser tests.
Documentation for `EarmarkAstDsl`.
### `tag`
The most general helper is the tag function:
```elixir
iex(1)> tag("div", "Some content")
{"div", [], ["Some content"], %{}}
```
Content and attributes can be provided as arrays, ...
```elixir
iex(2)> tag("p", ~w[Hello World], class: "hidden")
{"p", [{"class", "hidden"}], ["Hello", "World"], %{}}
```
... or maps:
```elixir
iex(3)> tag("p", ~w[Hello World], %{class: "hidden"})
{"p", [{"class", "hidden"}], ["Hello", "World"], %{}}
```
#### Annotations (as implemented in `EarmarkParser` >= v1.4.16)
In order to not overload tha API for `tag/2`, `tag/3` and `tag/4` we offer the general
`tag_annotated` function
```elixir
iex(4)> tag_annotated("header", "content", "annotation")
{"header", [], ["content"], %{annotation: "annotation"}}
```
in this case atts come last
```elixir
iex(5)> tag_annotated("header", "content", "annotation", class: "two")
{"header", [{"class", "two"}], ["content"], %{annotation: "annotation"}}
```
### Shortcuts for `p` and `div`
```elixir
iex(6)> p("A para")
{"p", [], ["A para"], %{}}
```
```elixir
iex(7)> div(tag("span", "content"))
{"div", [], [{"span", [], ["content"], %{}}], %{}}
```
#### Annotations
```elixir
iex(8)> p_annotated("", "%% green")
{"p", [], [""], %{annotation: "%% green"}}
```
and with attributes
```elixir
iex(9)> div_annotated("", "%% green", class: "five", data: 2)
{"div", [{"class", "five"}, {"data", "2"}], [""], %{annotation: "%% green"}}
```
More helpers, which are less common are described on their functiondocs
### EarmarkAstDsl.pre_code/2
A convenient shortcut for the often occurring `<pre><code>` tag chain
```elixir
iex(10)> pre_code("hello")
{"pre", [], [{"code", [], ["hello"], %{}}], %{}}
```
### EarmarkAstDsl.pre_code_annotated/3
The annotation adding helper
```elixir
iex(11)> pre_code_annotated("code", "@@lang=elixir")
{"pre", [], [{"code", [], ["code"], %{annotation: "@@lang=elixir"}}], %{}}
```
### EarmarkAstDsl.table/2
### Tables
Tables are probably the _raison d'être_ ot this little lib, as their ast is quite verbose, as we will see
here:
```elixir
iex(12)> table("one cell only") # and look at the output
{"table", [], [
{"tbody", [], [
{"tr", [], [
{"td", [{"style", "text-align: left;"}], ["one cell only"], %{}}
], %{}}
], %{}}
], %{}}
```
Now if we want a header and have some more data:
```elixir
iex(13)> table([~w[1-1 1-2], ~w[2-1 2-2]], head: ~w[left right]) # This is quite verbose!
{"table", [], [
{"thead", [], [
{"tr", [], [
{"th", [{"style", "text-align: left;"}], ["left"], %{}},
{"th", [{"style", "text-align: left;"}], ["right"], %{}},
], %{}}
], %{}},
{"tbody", [], [
{"tr", [], [
{"td", [{"style", "text-align: left;"}], ["1-1"], %{}},
{"td", [{"style", "text-align: left;"}], ["1-2"], %{}},
], %{}},
{"tr", [], [
{"td", [{"style", "text-align: left;"}], ["2-1"], %{}},
{"td", [{"style", "text-align: left;"}], ["2-2"], %{}},
], %{}}
], %{}}
], %{}}
```
And tables can easily be aligned differently in Markdown, which makes some style helpers
very useful
```elixir
iex(14)> table([~w[1-1 1-2], ~w[2-1 2-2]],
...(14)> head: ~w[alpha beta],
...(14)> text_aligns: ~w[right center])
{"table", [], [
{"thead", [], [
{"tr", [], [
{"th", [{"style", "text-align: right;"}], ["alpha"], %{}},
{"th", [{"style", "text-align: center;"}], ["beta"], %{}},
], %{}}
], %{}},
{"tbody", [], [
{"tr", [], [
{"td", [{"style", "text-align: right;"}], ["1-1"], %{}},
{"td", [{"style", "text-align: center;"}], ["1-2"], %{}},
], %{}},
{"tr", [], [
{"td", [{"style", "text-align: right;"}], ["2-1"], %{}},
{"td", [{"style", "text-align: center;"}], ["2-2"], %{}},
], %{}}
], %{}}
], %{}}
```
Some leeway is given for the determination of the number of columns,
bear in mind that Markdown only supports regularly shaped tables with
a fixed number of columns.
Problems might arise when we have a table like the following
| alpha |
| beta *gamma* |
where the first cell contains one element, but the second two, we can
hint that we only want one by grouping into tuples
```elixir
iex(15)> table(["alpha", {"beta", tag("em", "gamma")}])
{"table", [], [
{"tbody", [], [
{"tr", [], [
{"td", [{"style", "text-align: left;"}], ["alpha"], %{}},
], %{}},
{"tr", [], [
{"td", [{"style", "text-align: left;"}], ["beta", {"em", [], ["gamma"], %{}}], %{}}
], %{}}
], %{}}
], %{}}
```
### EarmarkAstDsl.tag/4
This is the base helper which emits a tag with its content, attributes and metadata can be added
at the user's convenience
```elixir
iex(16)> tag("div")
{"div", [], [], %{}}
```
With content,
```elixir
iex(17)> tag("span", "hello")
{"span", [], ["hello"], %{}}
```
... and attributes,
```elixir
iex(18)> tag("code", "let it(:be_light)", [class: "inline"])
{"code", [{"class", "inline"}], ["let it(:be_light)"], %{}}
```
... and metadata
```elixir
iex(19)> tag("div", "content", [], %{verbatim: true})
{"div", [], ["content"], %{verbatim: true}}
```
### EarmarkAstDsl.tag_annotated/4
A convience function for easy addition of an annotation to the meta map
### EarmarkAstDsl.void_tag/2
Void tags are just convenient shortcats for calls to `tag` with the second argument
`nil` or `[]`
One cannot pass metadata to a void_tag call
```elixir
iex(20)> void_tag("hr")
{"hr", [], [], %{}}
```
```elixir
iex(21)> void_tag("hr", class: "thin")
{"hr", [{"class", "thin"}], [], %{}}
```
### EarmarkAstDsl.void_tag_annotated/3
Again the annotated version is available
```elixir
iex(22)> void_tag_annotated("br", "// break")
{"br", [], [], %{annotation: "// break"}}
```
```elixir
iex(23)> void_tag_annotated("wbr", "// for printer", class: "nine")
{"wbr", [{"class", "nine"}], [], %{annotation: "// for printer"}}
```
### EarmarkAstDsl.vtag/3
vtags are tags from verbatim html
```elixir
iex(24)> vtag("div", "hello")
{"div", [], ["hello"], %{verbatim: true}}
```
Attributes can be provided, of course
```elixir
iex(25)> vtag("div", ["some", "content"], [{"data-lang", "elixir"}])
{"div", [{"data-lang", "elixir"}], ["some", "content"], %{verbatim: true}}
```
### EarmarkAstDsl.vtag_annotated/4
Verbatim tags still can be annotated and therefore we have this helper
```elixir
iex(26)> vtag_annotated("i", "emphasized", "-- verbatim", printer: "no")
{"i", [{"printer", "no"}], ["emphasized"], %{annotation: "-- verbatim", verbatim: true}}
```
Same doc can be found here (for latest release)
[https://hexdocs.pm/earmark_ast_dsl](https://hexdocs.pm/earmark_ast_dsl).
## Author
Copyright © 2020,1 Robert Dober
mailto: robert.dober@gmail.com
# LICENSE
Same as Elixir, which is Apache License v2.0. Please refer to [LICENSE](LICENSE) for details.
SPDX-License-Identifier: Apache-2.0
