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97 lines
2.6 KiB
Ruby
97 lines
2.6 KiB
Ruby
require File.dirname(__FILE__) + '/../sass'
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require 'sass/tree/node'
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require 'sass/tree/value_node'
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require 'sass/tree/rule_node'
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module Sass
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# This is the class where all the parsing and processing of the Sass
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# template is done. It can be directly used by the user by creating a
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# new instance and calling <tt>render</tt> to render the template. For example:
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#
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# template = File.load('stylesheets/sassy.sass')
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# sass_engine = Sass::Engine.new(template)
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# output = sass_engine.render
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# puts output
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class Engine
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# The character that begins a CSS attribute.
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ATTRIBUTE_CHAR = ':'[0]
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# The string that begins one-line comments.
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COMMENT_STRING = '//'
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# Creates a new instace of Sass::Engine that will compile the given
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# template string when <tt>render</tt> is called.
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# See README for available options.
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#
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#--
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#
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# TODO: Add current options to REFRENCE.
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#
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# When adding options, remember to add information about them
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# to README!
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#++
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#
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def initialize(template, options={})
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@template = template.split("\n")
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@options = options
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@index = 0
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end
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# Processes the template and returns the result as a string.
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def render
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root = Tree::Node.new
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first_line, first_tabs = next_line
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build_tree(first_line, root, first_tabs)
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root.to_s
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end
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private
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def build_tree(line, node, tabs)
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current_tabs = tabs
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tabs ||= 0
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while line && (current_tabs.nil? || current_tabs >= tabs)
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if current_tabs.nil?
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line, current_tabs = next_line
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elsif current_tabs == tabs
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node << parse_line(line)
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line, current_tabs = next_line
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else # current_tabs > tabs
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line, current_tabs = build_tree(line, node.children[-1], current_tabs)
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end
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end
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[line, current_tabs]
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end
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def next_line
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line = @template[@index]
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return if line.nil?
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# TODO: Allow comments appended to the end of lines, find some way to make url(http://www.google.com/) work
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line = '' if line[0..1] == COMMENT_STRING
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current_tabs = count_soft_tabs(line)
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line.strip!
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@index += 1
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[line, current_tabs]
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end
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def parse_line(line)
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if line[0] == ATTRIBUTE_CHAR
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name, *value = line.split(' ')
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name = name[1..-1]
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Tree::AttrNode.new(name, value)
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else
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Tree::RuleNode.new(line)
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end
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end
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# Counts the tabulation of a line.
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def count_soft_tabs(line)
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spaces = line.index(/[^ ]/)
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spaces ? spaces/2 : nil
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end
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end
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end
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