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9ae435a83c
Author | SHA1 | Date |
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Emery Hemingway | 9ae435a83c | |
Emery Hemingway | 375cc992fd |
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@ -1,6 +1,6 @@
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# Package
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version = "20240208"
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version = "20240312"
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author = "Emery Hemingway"
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description = "data model and serialization format"
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license = "Unlicense"
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@ -5,9 +5,9 @@ import std/[options, sets, sequtils, strutils, tables, typetraits]
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from std/algorithm import sort
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from std/json import escapeJson, escapeJsonUnquoted
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import bigints
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import ./preserves/private/[encoding, decoding, dot, macros, parsing, texts, values]
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import ./preserves/private/[buffering, encoding, decoding, dot, macros, parsing, texts, values]
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export encoding, decoding, parsing, texts, values
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export buffering, encoding, decoding, parsing, texts, values
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when defined(tracePreserves):
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when defined(posix):
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@ -551,7 +551,7 @@ proc fromAtom*[T](v: var T; a: ATom): bool =
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elif T is distinct:
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result = fromAtom(v.distinctBase, a)
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proc fromPreserves*[T](v: var T; pr: Value): bool {.gcsafe.} =
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proc fromPreserves*[T](v: var T; pr: Value): bool =
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## Inplace version of `preservesTo`. Returns ``true`` on
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## a complete match, otherwise returns ``false``.
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## Can be customized with `fromPreservesHook(x: T; var pr: Value): bool`.
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@ -878,7 +878,7 @@ proc apply*(result: var Value; op: proc(_: var Value) {.gcsafe.}) {.gcsafe.} =
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recurse(e.val)
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cannonicalize(result)
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proc mapEmbeds*(pr: sink Value; op: proc (x: Value): Value {.gcsafe.}): Value {.gcsafe.} =
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proc mapEmbeds*(pr: sink Value; op: proc (x: Value): Value): Value =
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## Process all embeds in a `Value`.
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case pr.kind
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of pkBoolean, pkFloat, pkRegister, pkBigInt,
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@ -0,0 +1,79 @@
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# SPDX-FileCopyrightText: ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[endians, options, streams, strutils]
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import bigints
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import ./decoding, ./parsing, ./values
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type BufferedDecoder* = object
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## Type for buffering binary Preserves before decoding.
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stream: StringStream
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appendPosition, decodePosition, maxSize: int
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proc newBufferedDecoder*(maxSize = 4096): BufferedDecoder =
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## Create a new `newBufferedDecoder`.
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runnableExamples:
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var
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buf = newBufferedDecoder()
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bin = encode(parsePreserves("<foobar>"))
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buf.feed(bin[0..2])
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buf.feed(bin[3..bin.high])
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var (success, pr) = decode(buf)
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assert success
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assert $pr == "<foobar>"
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BufferedDecoder(
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stream: newStringStream(newStringOfCap(maxSize)),
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maxSize: maxSize,
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)
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proc feed*(dec: var BufferedDecoder; buf: pointer; len: int) =
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assert len > 0
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if dec.maxSize > 0 and dec.maxSize < (dec.appendPosition + len):
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raise newException(IOError, "BufferedDecoder at maximum buffer size")
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dec.stream.setPosition(dec.appendPosition)
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dec.stream.writeData(buf, len)
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inc(dec.appendPosition, len)
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assert dec.appendPosition == dec.stream.getPosition()
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proc feed*[T: byte|char](dec: var BufferedDecoder; data: openarray[T]) =
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if data.len > 0:
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dec.feed(addr data[0], data.len)
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proc feed*[T: byte|char](dec: var BufferedDecoder; data: openarray[T]; slice: Slice[int]) =
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let n = slice.b + 1 - slice.a
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if n > 0:
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dec.feed(addr data[slice.a], n)
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proc decode*(dec: var BufferedDecoder): Option[Value] =
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## Decode from `dec`. If decoding fails the internal position of the
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## decoder does not advance.
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if dec.appendPosition > 0:
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assert(dec.decodePosition < dec.appendPosition)
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dec.stream.setPosition(dec.decodePosition)
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try:
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result = dec.stream.decodePreserves.some
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dec.decodePosition = dec.stream.getPosition()
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if dec.decodePosition == dec.appendPosition:
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dec.stream.setPosition(0)
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dec.stream.data.setLen(0)
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dec.appendPosition = 0
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dec.decodePosition = 0
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except IOError:
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discard
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proc parse*(dec: var BufferedDecoder): Option[Value] =
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## Parse from `dec`. If parsing fails the internal position of the
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## decoder does not advance.
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if dec.appendPosition > 0:
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assert(dec.decodePosition < dec.appendPosition)
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dec.stream.setPosition(dec.decodePosition)
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try:
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result = dec.stream.readAll.parsePreserves.some
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dec.decodePosition = dec.stream.getPosition()
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if dec.decodePosition == dec.appendPosition:
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dec.stream.setPosition(0)
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dec.stream.data.setLen(0)
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dec.appendPosition = 0
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dec.decodePosition = 0
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except IOError, ValueError:
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discard
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@ -130,54 +130,3 @@ proc decodePreserves*(s: string): Value =
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proc decodePreserves*(s: seq[byte]): Value =
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## Decode a byte-string of binary-encoded Preserves.
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decodePreserves(cast[string](s))
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type BufferedDecoder* = object
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## Type for buffering binary Preserves before decoding.
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stream: StringStream
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appendPosition, decodePosition, maxSize: int
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proc newBufferedDecoder*(maxSize = 4096): BufferedDecoder =
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## Create a new `newBufferedDecoder`.
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runnableExamples:
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var
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buf = newBufferedDecoder()
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bin = encode(parsePreserves("<foobar>"))
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buf.feed(bin[0..2])
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buf.feed(bin[3..bin.high])
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var (success, pr) = decode(buf)
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assert success
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assert $pr == "<foobar>"
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BufferedDecoder(
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stream: newStringStream(newStringOfCap(maxSize)),
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maxSize: maxSize,
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)
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proc feed*(dec: var BufferedDecoder; buf: pointer; len: int) =
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assert len > 0
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if dec.maxSize > 0 and dec.maxSize < (dec.appendPosition + len):
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raise newException(IOError, "BufferedDecoder at maximum buffer size")
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dec.stream.setPosition(dec.appendPosition)
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dec.stream.writeData(buf, len)
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inc(dec.appendPosition, len)
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assert dec.appendPosition == dec.stream.getPosition()
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proc feed*[T: byte|char](dec: var BufferedDecoder; data: openarray[T]) =
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if data.len > 0:
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dec.feed(unsafeAddr data[0], data.len)
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proc decode*(dec: var BufferedDecoder): Option[Value] =
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## Decode from `dec`. If decoding fails the internal position of the
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## decoder does not advance.
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if dec.appendPosition > 0:
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assert(dec.decodePosition < dec.appendPosition)
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dec.stream.setPosition(dec.decodePosition)
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try:
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result = dec.stream.decodePreserves.some
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dec.decodePosition = dec.stream.getPosition()
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if dec.decodePosition == dec.appendPosition:
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dec.stream.setPosition(0)
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dec.stream.data.setLen(0)
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dec.appendPosition = 0
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dec.decodePosition = 0
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except IOError:
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discard
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