97 lines
1.2 KiB
Io
97 lines
1.2 KiB
Io
input := ""
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stack := List clone
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should_quit := false
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ops := Map clone
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doFile("operators.io")
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fns := Map clone
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doFile("functions.io")
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isnan := method(x, x asNumber != x asNumber)
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pop := method(
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stack pop
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)
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push := method(x,
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if(x != nil,
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stack append(x)
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)
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)
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print_stack := method(
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stack foreach(v, write(v, ", "))
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write("\n")
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)
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read := method(
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if(should_quit, return)
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input = File standardInput readLine
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doall(input)
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print_stack
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)
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action_queue := List clone
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doall := method(line,
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action_queue = line splitNoEmpties
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while(action_queue size > 0,
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action := action_queue removeAt(0)
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doword(action)
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)
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)
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doword := method(word,
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if(isnan(word), exec(word), push(word asNumber))
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)
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exec := method(op,
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if(op at(0) asCharacter == "'",
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push(op exSlice(1))
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return
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)
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if(op == "defun",
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name := pop
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code := stack clone
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stack empty
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add_fn(name, block(
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code foreach(v, doword(v))
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))
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return
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)
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if(ops hasKey(op),
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action := ops at(op)
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result := action call(pop, pop)
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push(result)
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return
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)
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if(fns hasKey(op),
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action := fns at(op)
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action call
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return
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)
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)
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if(System args size > 1,
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file := File with(System args at(1)) openForReading
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doall(file contents)
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)
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print_stack
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while(should_quit == false, read)
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