NimYAML/yaml/hints.nim

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# NimYAML - YAML implementation in Nim
# (c) Copyright 2016 Felix Krause
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
## =================
## Module yaml.hints
## =================
##
## The hints API enables you to guess the type of YAML scalars.
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import macros
import ../private/internal
type
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TypeHint* = enum
## A type hint can be computed from scalar content and tells you what
## NimYAML thinks the scalar's type is. It is generated by
## `guessType <#guessType,string>`_ The first matching RegEx
## in the following table will be the type hint of a scalar string.
##
## You can use it to determine the type of YAML scalars that have a '?'
## non-specific tag, but using this feature is completely optional.
##
## ================== =========================
## Name RegEx
## ================== =========================
## ``yTypeInteger`` ``0 | -? [1-9] [0-9]*``
## ``yTypeFloat`` ``-? [1-9] ( \. [0-9]* [1-9] )? ( e [-+] [1-9] [0-9]* )?``
## ``yTypeFloatInf`` ``-? \. (inf | Inf | INF)``
## ``yTypeFloatNaN`` ``-? \. (nan | NaN | NAN)``
## ``yTypeBoolTrue`` ``y|Y|yes|Yes|YES|true|True|TRUE|on|On|ON``
## ``yTypeBoolFalse`` ``n|N|no|No|NO|false|False|FALSE|off|Off|OFF``
## ``yTypeNull`` ``~ | null | Null | NULL``
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## ``yTypeTimestamp`` see `here <http://yaml.org/type/timestamp.html>`_.
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## ``yTypeUnknown`` ``*``
## ================== =========================
yTypeInteger, yTypeFloat, yTypeFloatInf, yTypeFloatNaN, yTypeBoolTrue,
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yTypeBoolFalse, yTypeNull, yTypeUnknown, yTypeTimestamp
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YamlTypeHintState = enum
ythInitial,
ythF, ythFA, ythFAL, ythFALS, ythFALSE,
ythN, ythNU, ythNUL, ythNULL,
ythNO,
ythO, ythON,
ythOF, ythOFF,
ythT, ythTR, ythTRU, ythTRUE,
ythY, ythYE, ythYES,
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ythPoint, ythPointI, ythPointIN, ythPointINF,
ythPointN, ythPointNA, ythPointNAN,
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ythLowerFA, ythLowerFAL, ythLowerFALS,
ythLowerNU, ythLowerNUL,
ythLowerOF,
ythLowerTR, ythLowerTRU,
ythLowerYE,
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ythPointLowerIN, ythPointLowerN, ythPointLowerNA,
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ythMinus, yth0, ythInt1, ythInt1Zero, ythInt2, ythInt2Zero, ythInt3,
ythInt3Zero, ythInt4, ythInt4Zero, ythInt,
ythDecimal, ythNumE, ythNumEPlusMinus, ythExponent,
ythYearMinus, ythMonth1, ythMonth2, ythMonthMinus, ythMonthMinusNoYmd,
ythDay1, ythDay1NoYmd, ythDay2, ythDay2NoYmd,
ythAfterDayT, ythAfterDaySpace, ythHour1, ythHour2, ythHourColon,
ythMinute1, ythMinute2, ythMinuteColon, ythSecond1, ythSecond2, ythFraction,
ythAfterTimeSpace, ythAfterTimeZ, ythAfterTimePlusMinus, ythTzHour1,
ythTzHour2, ythTzHourColon, ythTzMinute1, ythTzMinute2
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macro typeHintStateMachine(c: untyped, content: untyped): typed =
yAssert content.kind == nnkStmtList
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result = newNimNode(nnkCaseStmt, content).add(copyNimNode(c))
for branch in content.children:
yAssert branch.kind == nnkOfBranch
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var
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charBranch = newNimNode(nnkOfBranch, branch)
i = 0
stateBranches = newNimNode(nnkCaseStmt, branch).add(
newIdentNode("typeHintState"))
while branch[i].kind != nnkStmtList:
charBranch.add(copyNimTree(branch[i]))
inc(i)
for rule in branch[i].children:
yAssert rule.kind == nnkInfix
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yAssert $rule[0].ident == "=>"
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var stateBranch = newNimNode(nnkOfBranch, rule)
case rule[1].kind
of nnkBracket:
for item in rule[1].children: stateBranch.add(item)
of nnkIdent: stateBranch.add(rule[1])
else: internalError("Invalid rule kind: " & $rule[1].kind)
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if rule[2].kind == nnkNilLit:
stateBranch.add(newStmtList(newNimNode(nnkDiscardStmt).add(
newEmptyNode())))
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else:
stateBranch.add(newStmtList(newAssignment(
newIdentNode("typeHintState"), copyNimTree(rule[2]))))
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stateBranches.add(stateBranch)
stateBranches.add(newNimNode(nnkElse).add(newStmtList(
newNimNode(nnkReturnStmt).add(newIdentNode("yTypeUnknown")))))
charBranch.add(newStmtList(stateBranches))
result.add(charBranch)
result.add(newNimNode(nnkElse).add(newStmtList(
newNimNode(nnkReturnStmt).add(newIdentNode("yTypeUnknown")))))
template advanceTypeHint(ch: char) {.dirty.} =
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typeHintStateMachine ch:
of '~': ythInitial => ythNULL
of '.':
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[yth0, ythInt1, ythInt2, ythInt3, ythInt4, ythInt] => ythDecimal
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[ythInitial, ythMinus] => ythPoint
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ythSecond2 => ythFraction
of '+':
ythNumE => ythNumEPlusMinus
[ythFraction, ythSecond2] => ythAfterTimePlusMinus
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of '-':
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ythInitial => ythMinus
ythNumE => ythNumEPlusMinus
[ythInt4, ythInt4Zero] => ythYearMinus
ythMonth1 => ythMonthMinusNoYmd
ythMonth2 => ythMonthMinus
[ythFraction, ythSecond2] => ythAfterTimePlusMinus
of ':':
[ythHour1, ythHour2] => ythHourColon
ythMinute2 => ythMinuteColon
[ythTzHour1, ythTzHour2] => ythTzHourColon
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of '0':
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ythInitial => ythInt1Zero
ythMinus => yth0
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[ythNumE, ythNumEPlusMinus] => ythExponent
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ythInt1 => ythInt2
ythInt1Zero => ythInt2Zero
ythInt2 => ythInt3
ythInt2Zero => ythInt3Zero
ythInt3 => ythInt4
ythInt3Zero => ythInt4Zero
ythInt4 => ythInt
ythYearMinus => ythMonth1
ythMonth1 => ythMonth2
ythMonthMinus => ythDay1
ythMonthMinusNoYmd => ythDay1NoYmd
ythDay1 => ythDay2
ythDay1NoYmd => ythDay2NoYmd
[ythAfterDaySpace, ythAfterDayT] => ythHour1
ythHour1 => ythHour2
ythHourColon => ythMinute1
ythMinute1 => ythMinute2
ythMinuteColon => ythSecond1
ythSecond1 => ythSecond2
ythAfterTimePlusMinus => ythTzHour1
ythTzHour1 => ythTzHour2
ythTzHourColon => ythTzMinute1
ythTzMinute1 => ythTzMinute2
[ythInt, ythDecimal, ythExponent, ythFraction] => nil
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of '1'..'9':
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ythInitial => ythInt1
ythInt1 => ythInt2
ythInt1Zero => ythInt2Zero
ythInt2 => ythInt3
ythInt2Zero => ythInt3Zero
ythInt3 => ythInt4
ythInt3Zero => ythInt4Zero
[ythInt4, ythMinus] => ythInt
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[ythNumE, ythNumEPlusMinus] => ythExponent
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ythYearMinus => ythMonth1
ythMonth1 => ythMonth2
ythMonthMinus => ythDay1
ythMonthMinusNoYmd => ythDay1NoYmd
ythDay1 => ythDay2
ythDay1NoYmd => ythDay2NoYmd
[ythAfterDaySpace, ythAfterDayT] => ythHour1
ythHour1 => ythHour2
ythHourColon => ythMinute1
ythMinute1 => ythMinute2
ythMinuteColon => ythSecond1
ythSecond1 => ythSecond2
ythAfterTimePlusMinus => ythTzHour1
ythTzHour1 => ythTzHour2
ythTzHourColon => ythTzMinute1
ythTzMinute1 => ythTzMinute2
[ythInt, ythDecimal, ythExponent, ythFraction] => nil
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of 'a':
ythF => ythLowerFA
ythPointN => ythPointNA
ythPointLowerN => ythPointLowerNA
of 'A':
ythF => ythFA
ythPointN => ythPointNA
of 'e':
[yth0, ythInt, ythDecimal] => ythNumE
ythLowerFALS => ythFALSE
ythLowerTRU => ythTRUE
ythY => ythLowerYE
of 'E':
[yth0, ythInt, ythDecimal] => ythNumE
ythFALS => ythFALSE
ythTRU => ythTRUE
ythY => ythYE
of 'f':
ythInitial => ythF
ythO => ythLowerOF
ythLowerOF => ythOFF
ythPointLowerIN => ythPointINF
of 'F':
ythInitial => ythF
ythO => ythOF
ythOF => ythOFF
ythPointIN => ythPointINF
of 'i', 'I': ythPoint => ythPointI
of 'l':
ythLowerNU => ythLowerNUL
ythLowerNUL => ythNULL
ythLowerFA => ythLowerFAL
of 'L':
ythNU => ythNUL
ythNUL => ythNULL
ythFA => ythFAL
of 'n':
ythInitial => ythN
ythO => ythON
ythPoint => ythPointLowerN
ythPointI => ythPointLowerIN
ythPointLowerNA => ythPointNAN
of 'N':
ythInitial => ythN
ythO => ythON
ythPoint => ythPointN
ythPointI => ythPointIN
ythPointNA => ythPointNAN
of 'o', 'O':
ythInitial => ythO
ythN => ythNO
of 'r': ythT => ythLowerTR
of 'R': ythT => ythTR
of 's':
ythLowerFAL => ythLowerFALS
ythLowerYE => ythYES
of 'S':
ythFAL => ythFALS
ythYE => ythYES
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of 't', 'T':
ythInitial => ythT
[ythDay1, ythDay2, ythDay1NoYmd, ythDay2NoYmd] => ythAfterDayT
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of 'u':
ythN => ythLowerNU
ythLowerTR => ythLowerTRU
of 'U':
ythN => ythNU
ythTR => ythTRU
of 'y', 'Y': ythInitial => ythY
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of 'Z': [ythSecond2, ythFraction, ythAfterTimeSpace] => ythAfterTimeZ
of ' ', '\t':
[ythSecond2, ythFraction] => ythAfterTimeSpace
[ythDay1, ythDay2, ythDay1NoYmd, ythDay2NoYmd] => ythAfterDaySpace
[ythAfterTimeSpace, ythAfterDaySpace] => nil
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proc guessType*(scalar: string): TypeHint {.raises: [].} =
## Parse scalar string according to the RegEx table documented at
## `TypeHint <#TypeHind>`_.
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var typeHintState: YamlTypeHintState = ythInitial
for c in scalar: advanceTypeHint(c)
case typeHintState
of ythNULL: result = yTypeNull
of ythTRUE, ythON, ythYES, ythY: result = yTypeBoolTrue
of ythFALSE, ythOFF, ythNO, ythN: result = yTypeBoolFalse
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of ythInt1, ythInt2, ythInt3, ythInt4, ythInt, yth0: result = yTypeInteger
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of ythDecimal, ythExponent: result = yTypeFloat
of ythPointINF: result = yTypeFloatInf
of ythPointNAN: result = yTypeFloatNaN
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of ythDay2, ythSecond2, ythFraction, ythAfterTimeZ, ythTzHour1, ythTzHour2,
ythTzMinute1, ythTzMinute2: result = yTypeTimestamp
else: result = yTypeUnknown