xsd2native.coffee

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xsd2native.coffee
¶

Good source for xsd data types: http://books.xmlschemata.org/relaxng/relax-CHP-19.html

TODO issue #63: add coerce flag to toNative to trigger best-effort coercion
```
isNumeric = (s) ->
```

http://stackoverflow.com/questions/18082/validate-decimal-numbers-in-javascript-isnumeric

  return not isNaN(parseFloat(s)) && isFinite(s)

createDateAsUTC = (date) ->
  return new Date(
    Date.UTC
      date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds()
  )

convertDateToUTC = (date) ->
  return new Date(
      date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(), date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds()
  )


(exports ? this).toNative = (value, literalType, isNum, raw) ->
  literalType ?= ""

Convert numeric values in a boolean context into their truth values

  if literalType is 'xsd:boolean' and isNumeric(value)
    if parseFloat(value) is 0
      return false
    else
      return true

These are the numeric (and logical) types which can be converted using JSON.parse (not eval for safety reasons)

  if isNum or literalType.match ///
    ^
      xsd\:(
        boolean
        |byte
        |decimal
        |double
        |float
        |int
        |integer
        |long
        |negativeInteger
        |nonNegativeInteger
        |nonPositiveInteger
        |positiveInteger
        |short
        |unsignedByte
        |unsignedInt
        |unsignedLong
        |unsignedShort
        )
    $///

TODO is there a distinction between int and integer (can Javascript handle integer or long?)

    value = value.replace(/^\+/,'') # suppress redundant plus signs eg: +88
    if value.match(/^INF$/)
      return 1e9000 # Infinity
    if value.match(/^-INF$/)
      return -1e9000 # -Infinity
    if value.match(/^NaN$/)

http://ariya.ofilabs.com/2014/05/the-curious-case-of-javascript-nan.html

      return Math.sqrt(-1) # TODO see Number.NaN for better support
    return JSON.parse(value)

These are the types which have string values returned, so no transformation is required.

  if literalType.match ///
    ^
      xsd\:(
        anyURI
        |anySimpleType
        |base64Binary
        |hexBinary
        |language
        |normalizedString
        |notation
        |string
        |token
        |ENTITY
        |ENTITIES
        |ID
        |IDREF
        |IDREFS
        |Name
        |NCName
        |NMTOKEN
        |NMTOKENS
        |QName
        )
    $///

¶

TODO should normalizedString,NMTOKEN,Name,NCName,hexBinary raise errors or coerce if the value is invalid?
```
    return value

  if not literalType
    if not value?
      return raw
```

These are the types which have date and time values which have javascript native equivalents

  if literalType.match ///
    ^
      xsd\:(
        date
        |dateTime
        )
    $///

¶

http://stackoverflow.com/a/20463521/1234699 Great writeup on JS date details http://stackoverflow.com/a/14006555/1234699 createDateAsUTC and convertDateToUTC
```
    r = new Date(value) # TODO harder trying is needed: no TZ? negative years?
```
¶

r = createDateAsUTC(r)
```
    offsetMin = r.getTimezoneOffset()
```

console.log “offsetMin:”, offsetMin

    if literalType is 'xsd:date' and offsetMin

r.setHours(0)

      r.setMinutes(offsetMin)
      r = convertDateToUTC(r)

r.setTimezone(“UTC”) r.setSeconds(0)

    if offsetMin and false
      console.log "before:",r

¶

console.log r.toLocaleString(“en-US”, {timeZone: ‘UTC’})
```
      console.log "after:",r
```
¶

console.log “RRRRRRRR”,r
```
    return r
```

These are the Data types which would require special libraries to express in JS

  if literalType.match ///
    ^
      xsd\:(
        duration
        |gDay
        |gMonth
        |gMonthDay
        |gYear
        |gYearMonth
        |time
        )
    $///
    return value

  return # otherwise return undefined to signal abandonment