HsYAML
Pure Haskell YAML 1.2 processor
https://github.com/haskell-hvr/HsYAML
Version on this page: | 0.2.1.1 |
LTS Haskell 22.39: | 0.2.1.4@rev:1 |
Stackage Nightly 2024-10-31: | 0.2.1.4@rev:1 |
Latest on Hackage: | 0.2.1.4@rev:1 |
HsYAML-0.2.1.1@sha256:628fead353260976e241fde2a86fb5f97d35491e912f52deda8a4cb4a36d04f2,5520
Module documentation for 0.2.1.1
HsYAML
is a YAML 1.2 processor, i.e. a library for parsing and serializing YAML documents.
Features of HsYAML
include:
Pure Haskell implementation with small dependency footprint and emphasis on strict compliance with the YAML 1.2 specification.
Direct decoding to native Haskell types via (
aeson
-inspired) typeclass-based API (seeData.YAML
).Allows round-tripping while preserving ordering, anchors, and comments at Event-level.
Support for constructing custom YAML node graph representation (including support for cyclic YAML data structures).
Support for the standard (untyped) Failsafe, (strict) JSON, and (flexible) Core "schemas" providing implicit typing rules as defined in the YAML 1.2 specification (including support for user-defined custom schemas; see
Data.YAML.Schema
).Support for emitting YAML using Failsafe, (strict) JSON, and (flexible) Core "schemas" (including support for user-defined custom encoding schemas; see
Data.YAML.Schema
).Event-based API resembling LibYAML's Event-based API (see
Data.YAML.Event
).Low-level API access to lexical token-based scanner (see
Data.YAML.Token
).
See also the HsYAML-aeson package which allows to decode and encode YAML by leveraging aeson
's FromJSON
and ToJSON
instances.
Changes
See also http://pvp.haskell.org/faq
0.2.1.1
2022-05-11
- Compatibility with
mtl-2.3
- Tested with GHC 7.4 - 9.2
0.2.1.0
- Define
Functor Doc
instance (#33) - New
withScalar
function and also defineToYAML Scalar
andFromYAML Scalar
instances - Export
Pair
type
synonym fromData.YAML
(#31) - New
Data.YAML.prettyPosWithSource
function for pretty-printing source locations (i.e.Pos
values) - Add export
docRoot :: Doc n -> n
field accessor for convenience (#32)
0.2.0.0
This release incorporates the work from Vijay Tadikamalla’s GSOC 2019 Project. Highlights of this major release include support for emitting YAML as well as providing direct access to source locations throughout the parsing pipeline for improved error reporting.
-
Changes in
Data.YAML
module- YAML 1.2 Schema encoders (#21)
- New
ToYAML
class for encoding Haskell Data-types from which YAML nodes can be constructed (#20)- New functions like
encodeNode
,encodeNode'
for constructing AST - New functions like
encode
,encode1
,encodeStrict
,encode1Strict
for supporting typeclass-based dumping - Some ToYAML instances and other api
- New functions like
- Modify
typeMismatch
function to show error source location in error messages (#19) - Provide location-aware
failAtNode
alternative tofail
-
Changes in
Data.YAML.Event
module- Preserve and round-trip Comments at Event level(#24)
- New
Comment
Event to preserve comments while parsing - Some additional implementations to preserve and round-trip comments
- New
- Fix issue #22
- New
EvPos
type for recording event and their corresponding position (#19) - Preserve Flow Mapping and Flow sequence (#18)
- Features to preserve Literal/Folded ScalarStyle (#15)
- New
Chomp
type denoting Block Chomping Indicator - New
IndentOfs
type denoting Block Indentation Indicator
- New
- New
NodeStyle
type denoting flow/block style Event(SequenceStart,MappingStart)
constructors now recordNodeStyle
Style
type renamed toScalarType
- New
writeEvents
andwriteEventsText
function Event(DocumentStart)
now records YAML directive- Event parser now rejects duplicate/unsupported YAML/TAG directives as mandated by the YAML 1.2 specification
- Preserve and round-trip Comments at Event level(#24)
-
Move some schema related definitions from
Data.YAML
into the newData.YAML.Schema
module -
Make
decode
,decode1
,decodeStrict
,decode1Strict
,decodeNode
, anddecodeNode'
treat duplicate keys (under the respective YAML schema) in YAML mappings as a loader-error (controllable via newschemaResolverMappingDuplicates
schema property) -
Define
Generic
andNFData
instances for most types
0.1.1.3
- Fix bug in float regexp being too lax in the JSON and Core schema (#7)
- Remove dependency on
dlist
0.1.1.2
- Tolerate BOM at each
l-document-prefix
(rather than only at the first one encountered in a YAML stream) - Workaround broken
mtl-2.2.2
bundled in GHC 8.4.1 (#1) - Relax to GPL-2.0-or-later
0.1.1.1
- Reject (illegal) non-scalar code-points in UTF-32 streams
- Tolerate BOM at start of stream
- Disambiguate choice in
l-any-document
production regarding token separation ofc-directives-end
- Fix
c-indentation-indicator(n)
grammar production when auto-detecting indentation in the presence of empty leading lines; also reject (illegal) auto-indent-level scalars with leading more-indented all-space lines - Complete character escape rules for double-quoted scalars
- Minor optimizations
0.1.1.0
Data.YAML
module promoted fromTrustWorthy
toSafe
- Add
FromYAML Natural
instance - Add
MonadFail
,Alternative
, andMonadPlus
instances forData.YAML.Parser
- Add
Data.YAML.decodeStrict
function - Export
Data.YAML.typeMismatch
helper function
0.1.0.0
- First version. Released on an unsuspecting world.