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Diffstat (limited to 'lib/pure/marshal.nim')
| -rwxr-xr-x | lib/pure/marshal.nim | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/lib/pure/marshal.nim b/lib/pure/marshal.nim new file mode 100755 index 000000000..f96d177ae --- /dev/null +++ b/lib/pure/marshal.nim @@ -0,0 +1,288 @@ +# +# +# Nimrod's Runtime Library +# (c) Copyright 2011 Andreas Rumpf +# +# See the file "copying.txt", included in this +# distribution, for details about the copyright. +# + +## This module contains procs for serialization and deseralization of +## arbitrary Nimrod data structures. The serialization format uses JSON. + +import streams, typeinfo, json, intsets, tables + +proc ptrToInt(x: pointer): int {.inline.} = + result = cast[int](x) # don't skip alignment + +proc storeAny(s: PStream, a: TAny, stored: var TIntSet) = + case a.kind + of akNone: assert false + of akBool: s.write($getBool(a)) + of akChar: s.write(escapeJson($getChar(a))) + of akArray, akSequence: + if a.kind == akSequence and isNil(a): s.write("null") + else: + s.write("[") + for i in 0 .. a.len-1: + if i > 0: s.write(", ") + storeAny(s, a[i], stored) + s.write("]") + of akObject, akPureObject, akTuple: + s.write("{") + var i = 0 + for key, val in fields(a): + if i > 0: s.write(", ") + s.write(escapeJson(key)) + s.write(": ") + storeAny(s, val, stored) + inc(i) + s.write("}") + of akSet: + s.write("[") + var i = 0 + for e in elements(a): + if i > 0: s.write(", ") + s.write($e) + inc(i) + s.write("]") + of akRange: storeAny(s, skipRange(a), stored) + of akEnum: s.write(getEnumField(a).escapeJson) + of akPtr, akRef: + var x = a.getPointer + if isNil(x): s.write("null") + elif stored.containsOrIncl(x.ptrToInt): + # already stored, so we simply write out the pointer as an int: + s.write($x.ptrToInt) + else: + # else as a [value, key] pair: + # (reversed order for convenient x[0] access!) + s.write("[") + s.write($x.ptrToInt) + s.write(", ") + storeAny(s, a[], stored) + s.write("]") + of akProc, akPointer, akCString: s.write($a.getPointer.ptrToInt) + of akString: + var x = getString(a) + if IsNil(x): s.write("null") + else: s.write(escapeJson(x)) + of akInt..akInt64: s.write($getBiggestInt(a)) + of akFloat..akFloat128: s.write($getBiggestFloat(a)) + +proc loadAny(p: var TJsonParser, a: TAny, t: var TTable[biggestInt, pointer]) = + case a.kind + of akNone: assert false + of akBool: + case p.kind + of jsonFalse: setBiggestInt(a, 0) + of jsonTrue: setBiggestInt(a, 1) + else: raiseParseErr(p, "'true' or 'false' expected for a bool") + next(p) + of akChar: + if p.kind == jsonString: + var x = p.str + if x.len == 1: + setBiggestInt(a, ord(x[0])) + next(p) + return + raiseParseErr(p, "string of length 1 expected for a char") + of akEnum: + if p.kind == jsonString: + setBiggestInt(a, getEnumOrdinal(a, p.str)) + next(p) + return + raiseParseErr(p, "string expected for an enum") + of akArray: + if p.kind != jsonArrayStart: raiseParseErr(p, "'[' expected for an array") + next(p) + var i = 0 + while p.kind != jsonArrayEnd and p.kind != jsonEof: + loadAny(p, a[i], t) + inc(i) + if p.kind == jsonArrayEnd: next(p) + else: raiseParseErr(p, "']' end of array expected") + of akSequence: + case p.kind + of jsonNull: + setPointer(a, nil) + next(p) + of jsonArrayStart: + next(p) + invokeNewSeq(a, 0) + var i = 0 + while p.kind != jsonArrayEnd and p.kind != jsonEof: + extendSeq(a) + loadAny(p, a[i], t) + inc(i) + if p.kind == jsonArrayEnd: next(p) + else: raiseParseErr(p, "") + else: + raiseParseErr(p, "'[' expected for a seq") + of akObject, akPureObject, akTuple: + if a.kind == akObject: setObjectRuntimeType(a) + if p.kind != jsonObjectStart: raiseParseErr(p, "'{' expected for an object") + next(p) + while p.kind != jsonObjectEnd and p.kind != jsonEof: + if p.kind != jsonString: + raiseParseErr(p, "string expected for a field name") + var fieldName = p.str + next(p) + loadAny(p, a[fieldName], t) + if p.kind == jsonObjectEnd: next(p) + else: raiseParseErr(p, "'}' end of object expected") + of akSet: + if p.kind != jsonArrayStart: raiseParseErr(p, "'[' expected for a set") + next(p) + while p.kind != jsonArrayEnd and p.kind != jsonEof: + if p.kind != jsonInt: raiseParseErr(p, "int expected for a set") + inclSetElement(a, p.getInt.int) + next(p) + if p.kind == jsonArrayEnd: next(p) + else: raiseParseErr(p, "']' end of array expected") + of akPtr, akRef: + case p.kind + of jsonNull: + setPointer(a, nil) + next(p) + of jsonInt: + setPointer(a, t[p.getInt]) + next(p) + of jsonArrayStart: + next(p) + if a.kind == akRef: invokeNew(a) + else: setPointer(a, alloc0(a.baseTypeSize)) + if p.kind == jsonInt: + t[p.getInt] = getPointer(a) + next(p) + else: raiseParseErr(p, "index for ref type expected") + loadAny(p, a[], t) + if p.kind == jsonArrayEnd: next(p) + else: raiseParseErr(p, "']' end of ref-address pair expected") + else: raiseParseErr(p, "int for pointer type expected") + of akProc, akPointer, akCString: + case p.kind + of jsonNull: + setPointer(a, nil) + next(p) + of jsonInt: + setPointer(a, cast[pointer](p.getInt.int)) + next(p) + else: raiseParseErr(p, "int for pointer type expected") + of akString: + case p.kind + of jsonNull: + setPointer(a, nil) + next(p) + of jsonString: + setString(a, p.str) + next(p) + else: raiseParseErr(p, "string expected") + of akInt..akInt64: + if p.kind == jsonInt: + setBiggestInt(a, getInt(p)) + next(p) + return + raiseParseErr(p, "int expected") + of akFloat..akFloat128: + if p.kind == jsonFloat: + setBiggestFloat(a, getFloat(p)) + next(p) + return + raiseParseErr(p, "float expected") + of akRange: loadAny(p, a.skipRange, t) + +proc loadAny(s: PStream, a: TAny, t: var TTable[biggestInt, pointer]) = + var p: TJsonParser + open(p, s, "unknown file") + next(p) + loadAny(p, a, t) + close(p) + +proc load*[T](s: PStream, data: var T) = + ## loads `data` from the stream `s`. Raises `EIO` in case of an error. + var tab = initTable[biggestInt, pointer]() + loadAny(s, toAny(data), tab) + +proc store*[T](s: PStream, data: T) = + ## stores `data` into the stream `s`. Raises `EIO` in case of an error. + var stored = initIntSet() + var d: T + shallowCopy(d, data) + storeAny(s, toAny(d), stored) + +proc `$$`*[T](x: T): string = + ## returns a string representation of `x`. + var stored = initIntSet() + var d: T + shallowCopy(d, x) + var s = newStringStream() + storeAny(s, toAny(d), stored) + result = s.data + +proc to*[T](data: string): T = + ## reads data and transforms it to a ``T``. + var tab = initTable[biggestInt, pointer]() + loadAny(newStringStream(data), toAny(result), tab) + +when isMainModule: + template testit(x: expr) = echo($$to[type(x)]($$x)) + + var x: array[0..4, array[0..4, string]] = [ + ["test", "1", "2", "3", "4"], ["test", "1", "2", "3", "4"], + ["test", "1", "2", "3", "4"], ["test", "1", "2", "3", "4"], + ["test", "1", "2", "3", "4"]] + testit(x) + var test2: tuple[name: string, s: int] = ("tuple test", 56) + testit(test2) + + type + TE = enum + blah, blah2 + + TestObj = object + test, asd: int + case test2: TE + of blah: + help: string + else: + nil + + PNode = ref TNode + TNode = object + next, prev: PNode + data: string + + proc buildList(): PNode = + new(result) + new(result.next) + new(result.prev) + result.data = "middle" + result.next.data = "next" + result.prev.data = "prev" + result.next.next = result.prev + result.next.prev = result + result.prev.next = result + result.prev.prev = result.next + + var test3: TestObj + test3.test = 42 + test3.test2 = blah + testit(test3) + + var test4: ref tuple[a, b: string] + new(test4) + test4.a = "ref string test: A" + test4.b = "ref string test: B" + testit(test4) + + var test5 = @[(0,1),(2,3),(4,5)] + testit(test5) + + var test6: set[char] = {'A'..'Z', '_'} + testit(test6) + + var test7 = buildList() + echo($$test7) + testit(test7) + |