class Haml::HTML::ERB

A class for converting ERB code into a format that’s easier for the {Haml::HTML} Hpricot-based parser to understand.

Uses [Erubis](www.kuwata-lab.com/erubis)‘s extensible parsing powers to parse the ERB in a reliable way, and [ruby_parser](parsetree.rubyforge.org/)’s Ruby knowledge to figure out whether a given chunk of Ruby code starts a block or not.

The ERB tags are converted to HTML tags in the following way. `<% … %>` is converted into `<haml:silent> … </haml:silent>`. `<%= … %>` is converted into `<haml:loud> … </haml:loud>`. Finally, if either of these opens a Ruby block, `<haml:block> … </haml:block>` will wrap the entire contents of the block - that is, everything that should be indented beneath the previous silent or loud tag.

Public Class Methods

compile(template) click to toggle source

Compiles an ERB template into a HTML document containing `haml:` tags.

@param template [String] The ERB template @return [String] The output document @see Haml::HTML::ERB

# File lib/haml/html/erb.rb, line 27
def self.compile(template)
  new(template).src
end

Public Instance Methods

add_expr_debug(src, code) click to toggle source

`html2haml` doesn’t support debugging expressions.

# File lib/haml/html/erb.rb, line 81
def add_expr_debug(src, code)
  raise Haml::Error.new("html2haml doesn't support debugging expressions.")
end
add_expr_literal(src, code) click to toggle source

Concatenates a Ruby expression that’s printed to the document onto the source buffer. This uses the `<haml:silent>` tag, and may open a Ruby block with the `<haml:block>` tag. An expression never closes a block.

@param src [String] The source buffer @param code [String] The Ruby expression to add to the buffer

# File lib/haml/html/erb.rb, line 75
def add_expr_literal(src, code)
  src << '<haml:loud>' << h(code) << '</haml:loud>'
  src << '<haml:block>' if block_opener?(code)
end
add_postamble(src) click to toggle source

The ERB-to-Hamlized-HTML conversion has no postamble.

# File lib/haml/html/erb.rb, line 40
def add_postamble(src); end
add_preamble(src) click to toggle source

The ERB-to-Hamlized-HTML conversion has no preamble.

# File lib/haml/html/erb.rb, line 37
def add_preamble(src); end
add_stmt(src, code) click to toggle source

Concatenates a silent Ruby statement onto the source buffer. This uses the `<haml:silent>` tag, and may close and/or open a Ruby block with the `<haml:block>` tag.

In particular, a block is closed if this statement is some form of `end`, opened if it’s a block opener like `do`, `if`, or `begin`, and both closed and opened if it’s a mid-block keyword like `else` or `when`.

@param src [String] The source buffer @param code [String] The Ruby statement to add to the buffer

# File lib/haml/html/erb.rb, line 61
def add_stmt(src, code)
  src << '</haml:block>' if block_closer?(code) || mid_block?(code)
  src << '<haml:silent>' << h(code) << '</haml:silent>' unless code.strip == "end"
  src << '<haml:block>' if block_opener?(code) || mid_block?(code)
end
add_text(src, text) click to toggle source

Concatenates the text onto the source buffer.

@param src [String] The source buffer @param text [String] The raw text to add to the buffer

# File lib/haml/html/erb.rb, line 46
def add_text(src, text)
  src << text
end
escaped_expr(code) click to toggle source

`html2haml` doesn’t support HTML-escaped expressions.

# File lib/haml/html/erb.rb, line 32
def escaped_expr(code)
  raise Haml::Error.new("html2haml doesn't support escaped expressions.")
end