2015-03-29 22:33:57 +03:00
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#!/usr/bin/env julia
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import reader
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import printer
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# READ
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function READ(str)
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reader.read_str(str)
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end
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# EVAL
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function eval_ast(ast, env)
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if typeof(ast) == Symbol
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env[ast]
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2015-03-29 23:00:27 +03:00
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elseif isa(ast, Array) || isa(ast, Tuple)
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2015-03-29 22:33:57 +03:00
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map((x) -> EVAL(x,env), ast)
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else
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ast
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end
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end
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function EVAL(ast, env)
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if !isa(ast, Array)
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return eval_ast(ast, env)
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end
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# apply
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el = eval_ast(ast, env)
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f, args = el[1], el[2:end]
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f(args...)
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end
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# PRINT
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function PRINT(exp)
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printer.pr_str(exp)
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end
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# REPL
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repl_env = {:+ => +,
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:- => -,
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:* => *,
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:/ => div}
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function REP(str)
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return PRINT(EVAL(READ(str), repl_env))
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end
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while true
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print("user> ")
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flush(STDOUT)
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line = readline(STDIN)
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if line == ""
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break
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end
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line = chomp(line)
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try
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println(REP(line))
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catch e
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if isa(e, ErrorException)
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println("Error: $(e.msg)")
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else
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println("Error: $(string(e))")
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end
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bt = catch_backtrace()
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Base.show_backtrace(STDERR, bt)
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println()
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end
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end
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