59 lines
1.4 KiB
Ruby
59 lines
1.4 KiB
Ruby
require 'readline'
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module Sass
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# Runs a SassScript read-eval-print loop.
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# It presents a prompt on the terminal,
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# reads in SassScript expressions,
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# evaluates them,
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# and prints the result.
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class Repl
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# @param options [Hash<Symbol, Object>] An options hash.
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def initialize(options = {})
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@options = options
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end
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# Starts the read-eval-print loop.
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def run
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environment = Environment.new
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environment.set_var('important', Script::String.new('!important'))
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@line = 0
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loop do
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@line += 1
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unless text = Readline.readline('>> ')
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puts
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return
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end
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Readline::HISTORY << text
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parse_input(environment, text)
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end
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end
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private
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def parse_input(environment, text)
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case text
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when Script::MATCH
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name = $1
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guarded = $2 == '||='
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val = Script::Parser.parse($3, @line, text.size - $3.size)
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unless guarded && environment.var(name)
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environment.set_var(name, val.perform(environment))
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end
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p environment.var(name)
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else
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p Script::Parser.parse(text, @line, 0).perform(environment)
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end
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rescue Sass::SyntaxError => e
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puts "SyntaxError: #{e.message}"
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if @options[:trace]
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e.backtrace.each do |e|
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puts "\tfrom #{e}"
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end
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end
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end
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end
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end
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