Class: Utopia::Trenni::Scanner
- Inherits:
-
StringScanner
- Object
- StringScanner
- Utopia::Trenni::Scanner
- Defined in:
- lib/utopia/trenni.rb
Constant Summary collapse
- TEXT =
/([^<#]|<(?!\?r)|#(?!\{)){1,1024}/m
Instance Method Summary collapse
-
#initialize(callback, string) ⇒ Scanner
constructor
A new instance of Scanner.
- #parse ⇒ Object
- #scan_expression ⇒ Object
- #scan_text ⇒ Object
Constructor Details
#initialize(callback, string) ⇒ Scanner
Returns a new instance of Scanner.
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# File 'lib/utopia/trenni.rb', line 40 def initialize(callback, string) @callback = callback super(string) end |
Instance Method Details
#parse ⇒ Object
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# File 'lib/utopia/trenni.rb', line 45 def parse until eos? pos = self.pos scan_text scan_expression if pos == self.pos raise StandardError.new "Could not scan current input #{self.pos} #{eos?}!" end end end |
#scan_expression ⇒ Object
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# File 'lib/utopia/trenni.rb', line 64 def scan_expression if scan(/\#\{/) level = 1 code = "" until eos? || level == 0 if scan(/[^"'\{\}]+/m) code << matched end if scan(/"(\\"|[^"])*"/m) code << matched end if scan(/'(\\'|[^'])*'/m) code << matched end if scan(/\{/) code << matched level += 1 end if scan(/\}/) code << matched if level > 1 level -= 1 end end if level == 0 @callback.output(code) else raise StandardError.new "Could not find end of expression #{self}!" end elsif scan(/<\?r/) if scan_until(/(.*?)\?>/m) @callback.expression(self[1]) else raise StandardError.new "Could not find end of expression #{self}!" end end end |
#scan_text ⇒ Object
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# File 'lib/utopia/trenni.rb', line 58 def scan_text if scan(TEXT) @callback.text(matched) end end |