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Converters

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Converters — scripts that are used to interpret the values ​​of the text in each token.

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Converters allow you to convert data tokens placed in $parseTree.

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Declaration

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Converter declaration:

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patterns:\n  $four = four|| converter = function() {return 4}
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init:\n    function amountConverter(pt) {\n        var ret = pt.Number[0].value;\n        return ret\n    }
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    function amountConverter(pt) {\n        var ret = pt.Number[0].value;\n        return ret\n    }
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Functions of the converters get $parseTree as the first argument.

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You can use inside a converter the variable refering to $parseTree. To do this, set its name as the first argument of the function; the second argument is the context.

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Usage

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Using converters:

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Script:

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$Digit = $regexp<\\d+> || converter = numberConverterDigit
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.js-file:

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function numberConverterDigit(parseTree) {\n        return parseInt(parseTree.text);\n        }
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Script:

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$Numeral = (one:1|...) || converter = valueToNumberConverter
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.js-file:

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function valueToNumberConverter(parseTree) {\n        return parseInt(parseTree.value);\n        }
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Script:

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$Numeral = (one:1|...)\n$Minutes = $Numeral || converter = minutesConverter
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.js-file:

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function minutesConverter(parseTree) {\n         return parseInt(parseTree.Numeral.value)\n        };
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Script:

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$City = $entity<Cities> || converter = сityConverter
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.js-file:

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function сityConverter(parseTree) {\n        var id = parseTree.City[0].value;\n        return Cities[id].value;\n    }
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The $entity rule stores as a value only the entity identifier. The list of associated values ​​is contained in the dictionary.

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