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<?xml version="1.0" ?>
<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
initial="wrapper" datamodel="ecmascript" name="CalculatorStateMachine">
<datamodel>
<data id="long_expr" />
<data id="short_expr" />
<data id="res" />
</datamodel>
<state id="wrapper" initial="on">
<state id="on" initial="ready">
<onentry>
<send event="DISPLAY.UPDATE" />
</onentry>
<state id="ready" initial="begin">
<state id="begin">
<transition event="OPER.MINUS" target="negated1" />
<onentry>
<assign location="long_expr" expr="''" />
<assign location="short_expr" expr="0" />
<assign location="res" expr="0" />
<send event="DISPLAY.UPDATE" />
</onentry>
</state>
<state id="result">
</state>
<transition event="OPER" target="opEntered" />
<transition event="DIGIT.0" target="zero1">
<assign location="short_expr" expr="''" />
</transition>
<transition event="DIGIT" target="int1">
<assign location="short_expr" expr="''" />
</transition>
<transition event="POINT" target="frac1">
<assign location="short_expr" expr="''" />
</transition>
</state>
<state id="negated1">
<onentry>
<assign location="short_expr" expr="'-'" />
<send event="DISPLAY.UPDATE" />
</onentry>
<transition event="DIGIT.0" target="zero1" />
<transition event="DIGIT" target="int1" />
<transition event="POINT" target="frac1" />
</state>
<state id="operand1">
<state id="zero1">
<transition event="DIGIT" cond="_event.name != 'DIGIT.0'" target="int1" />
<transition event="POINT" target="frac1" />
</state>
<state id="int1">
<transition event="POINT" target="frac1" />
<transition event="DIGIT">
<assign location="short_expr" expr="short_expr+_event.name.substr(_event.name.lastIndexOf('.')+1)" />
<send event="DISPLAY.UPDATE" />
</transition>
<onentry>
<assign location="short_expr" expr="short_expr+_event.name.substr(_event.name.lastIndexOf('.')+1)" />
<send event="DISPLAY.UPDATE" />
</onentry>
</state>
<state id="frac1">
<onentry>
<assign location="short_expr" expr="short_expr+'.'" />
<send event="DISPLAY.UPDATE" />
</onentry>
<transition event="DIGIT">
<assign location="short_expr" expr="short_expr+_event.name.substr(_event.name.lastIndexOf('.')+1)" />
<send event="DISPLAY.UPDATE" />
</transition>
</state>
<transition event="OPER" target="opEntered" />
</state>
<state id="opEntered">
<transition event="OPER.MINUS" target="negated2" />
<transition event="POINT" target="frac2" />
<transition event="DIGIT.0" target="zero2" />
<transition event="DIGIT" target="int2" />
<onentry>
<raise event="CALC.SUB" />
<send target="#_internal" event="OP.INSERT">
<param name="operator" expr="_event.name" />
</send>
</onentry>
</state>
<state id="negated2">
<onentry>
<assign location="short_expr" expr="'-'" />
<send event="DISPLAY.UPDATE" />
</onentry>
<transition event="DIGIT.0" target="zero2" />
<transition event="DIGIT" target="int2" />
<transition event="POINT" target="frac2" />
</state>
<state id="operand2">
<state id="zero2">
<transition event="DIGIT" cond="_event.name != 'DIGIT.0'" target="int2" />
<transition event="POINT" target="frac2" />
</state>
<state id="int2">
<transition event="DIGIT">
<assign location="short_expr" expr="short_expr+_event.name.substr(_event.name.lastIndexOf('.')+1)" />
<send event="DISPLAY.UPDATE" />
</transition>
<onentry>
<assign location="short_expr" expr="short_expr+_event.name.substr(_event.name.lastIndexOf('.')+1)" />
<send event="DISPLAY.UPDATE" />
</onentry>
<transition event="POINT" target="frac2" />
</state>
<state id="frac2">
<onentry>
<assign location="short_expr" expr="short_expr +'.'" />
<send event="DISPLAY.UPDATE" />
</onentry>
<transition event="DIGIT">
<assign location="short_expr" expr="short_expr +_event.name.substr(_event.name.lastIndexOf('.')+1)" />
<send event="DISPLAY.UPDATE" />
</transition>
</state>
<transition event="OPER" target="opEntered">
<raise event="CALC.SUB" />
<raise event="OP.INSERT" />
</transition>
<transition event="EQUALS" target="result">
<raise event="CALC.SUB" />
<raise event="CALC.DO" />
</transition>
</state>
<transition event="C" target="on" />
</state>
<transition event="CALC.DO">
<assign location="short_expr" expr="''+ res" />
<assign location="long_expr" expr="''" />
<assign location="res" expr="0" />
</transition>
<transition event="CALC.SUB">
<if cond="short_expr!=''">
<assign location="long_expr" expr="long_expr+'('+short_expr+')'" />
</if>
<assign location="res" expr="eval(long_expr)" />
<assign location="short_expr" expr="''" />
<send event="DISPLAY.UPDATE" />
</transition>
<transition event="DISPLAY.UPDATE">
<log label="'result'" expr="short_expr==''?res:short_expr" />
<send event="updateDisplay">
<param name="display" expr="short_expr==''?res:short_expr"/>
</send>
</transition>
<transition event="OP.INSERT">
<log expr="_event.data.operator" />
<if cond="_event.data.operator == 'OPER.PLUS'">
<assign location="long_expr" expr="long_expr+'+'" />
<elseif cond="_event.data.operator=='OPER.MINUS'" />
<assign location="long_expr" expr="long_expr+'-'" />
<elseif cond="_event.data.operator=='OPER.STAR'" />
<assign location="long_expr" expr="long_expr+'*'" />
<elseif cond="_event.data.operator=='OPER.DIV'" />
<assign location="long_expr" expr="long_expr+'/'" />
</if>
</transition>
</state>
</scxml>
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