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Contents
require 'readline'
module Sass
# Runs a SassScript read-eval-print loop.
# It presents a prompt on the terminal,
# reads in SassScript expressions,
# evaluates them,
# and prints the result.
class Repl
# @param options [{Symbol => Object}] An options hash.
def initialize(options = {})
@options = options
end
# Starts the read-eval-print loop.
def run
environment = Environment.new
@line = 0
loop do
@line += 1
unless text = Readline.readline('>> ')
puts
return
end
Readline::HISTORY << text
parse_input(environment, text)
end
end
private
def parse_input(environment, text)
case text
when Script::MATCH
name = $1
guarded = $3 == '||=' || $4
val = Script::Parser.parse($3, @line, text.size - $3.size)
unless guarded && environment.var(name)
environment.set_var(name, val.perform(environment))
end
p environment.var(name)
else
p Script::Parser.parse(text, @line, 0).perform(environment)
end
rescue Sass::SyntaxError => e
puts "SyntaxError: #{e.message}"
if @options[:trace]
e.backtrace.each do |e|
puts "\tfrom #{e}"
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems