Class: HtmlConditionalComment::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/html-conditional-comment/parser.rb

Overview

Parse tokens into a tree of nodes

Pseudo grammar

template = { html | statement } statement = “<!” , [ “–” ] , “if” , expression , “]” , [ “–” ] , “>” , template , “<!” , [ “–” ] , “endif” , “]” , [ “–” ] , “>” expression = term [ “|” , term ] term = factor [ “&” , factor ] factor = subexpression | “!” , factor | “(” , expression , “)” subexpression = [ operator ] browser | boolean operator = “gt” | “gte” | “lt” | “lte” boolean = “true” | “false” browser = feature [ version_vector ]

Constant Summary collapse

OPEN = 
/\-\->$/
CLOSE = 
/<!\-\-$/

Instance Method Summary collapse

Constructor Details

#initialize(tokens) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/html-conditional-comment/parser.rb', line 28

def initialize(tokens)
  @symbol = nil
  @tokens = tokens
  @max_pos = tokens.size() - 1
  @pos = -1
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/html-conditional-comment/parser.rb', line 35

def parse()
  self.next()

  nodes = template()

  #Tokens left, syntax error
  error() if @pos < @max_pos

  nodes
end