class HTML {
"""
HTML generator class.
Example:
require: \"html\"
html = HTML new: @{
html: @{
head: @{ title: \"My Fancy Website\" }
body: @{
div: { id: \"main\" } with: \"Hello, Fancy World!\"
}
}
} . to_s
# html is now:
\"\"\"
My Fancy Website
Hello, Fancy World!
\"\"\"
"""
def initialize {
@buf = ""
@indent = 0
@indent_offset = 0
}
def initialize: block indentation: indent_offset (0) {
initialize
@indent_offset = indent_offset
block call: [self]
}
def indentation: @indent_offset
def open_tag: name attrs: attrs (<[]>) indent: indent (true) {
@buf << "\n"
@buf << (" " * (@indent + @indent_offset))
@indent = @indent + 2
@buf << "<" << name
unless: (attrs empty?) do: {
@buf << " "
attrs each: |k v| {
@buf << k << "=" << (v to_s inspect)
} in_between: {
@buf << " "
}
}
@buf << ">"
{ @indent = @indent - 2 } unless: indent
}
def close_tag: name linebreak: linebreak (true) {
{ @buf << "\n" } if: linebreak
@indent = @indent - 2
@buf << (" " * (@indent + @indent_offset))
@buf << ""
}
def html_block: tag body: body attrs: attrs (<[]>) {
tag = tag from: 0 to: -2
open_tag: tag attrs: attrs
content = body first
match content {
case Block -> @buf << (content call: [self])
case _ -> @buf << "\n" << (" " * (@indent + @indent_offset)) << content
}
close_tag: tag
nil
}
def unknown_message: m with_params: p {
match m to_s {
case /with:$/ ->
tag = m to_s substitute: /with:$/ with: ""
html_block: tag body: (p rest) attrs: (p first to_hash)
case _ ->
html_block: (m to_s) body: p
}
nil
}
def br {
@buf << "\n" << (" " * (@indent + @indent_offset))
@buf << "
"
nil
}
def script: attrs {
open_tag: "script" attrs: (attrs to_hash) indent: true
close_tag: "script" linebreak: false
nil
}
def textarea: attrs with: content ("") {
@buf << "\n" << (" " * (@indent + @indent_offset))
@buf << ""
nil
}
def to_s {
@buf from: 1 to: -1 . to_s
}
def self single_tags: single_tags {
single_tags each: |t| {
define_method: "#{t}:" with: |attrs| {
open_tag: t attrs: (attrs to_hash) indent: false
nil
}
}
}
single_tags: ('input, 'link, 'img)
}