v0.19.0

Added

• ArrayNode now has a contains_splat? flag if it has a splatted element in it.
• All of the remaining encodings have been implemented.
• Allow forwarding & in a method that has a ... parameter.
• Many statements that are found in non-statement positions are being properly rejected now.
• Void values are now properly checked.
• Referencing a parameter in its own default value is now properly rejected.
• DATA/__END__ is now parsed as its own field on parse result (data_loc) as opposed to as a comment.
• Blank * now properly forwards into arrays.
• ImplicitRestNode is introduced to represent the implicit rest of a destructure.
• We now support negative start lines.
• StringNode#heredoc?, InterpolatedStringNode#heredoc?, XStringNode#heredoc?, and InterpolatedXStringNode#heredoc? are introduced.
• NumberedParametersNode is introduced to represent the implicit set of parameters when numbered parameters are used.
• Prism::parse_success? and Prism::parse_failure? are introduced to bypass reifying the AST.
• We now emit a warning for constant assignments in method definitions.
• We now provide flags on strings and xstrings to indicate the correct encoding.
• The hash pattern rest field now more accurately parses ** and **nil.
• The equality operators are now properly parsed as non-associative.

Changed

• BREAKING: Many fields have changed positions within their nodes. This impacts the C API and the Ruby API if you are manually creating nodes through the initializer.
• BREAKING: Almost all of the error messages have been updated to begin with lowercase characters to match ruby/spec.
• Unterminated strings with only plain content are now always StringNode as opposed to InterpolatedStringNode
• BREAKING: Call node has been split up when it is in the target position into CallTargetNode and IndexTargetNode.

v0.18.0

Added

• The ParametersNode#signature method is added, which returns the same thing as Method#parameters.
• Visitor functionality has been added to the JavaScript API.
• The Node#to_dot API has been added to convert syntax trees to Graphviz digraphs.
• IfNode and UnlessNode now have a then_keyword_loc field.
• Many more encodings are now supported.
• Some new Location APIs have been added for dealing with characters instead of bytes, which are: start_character_offset, end_character_offset, start_character_column, and end_character_column.
• A warning has been added for when END {} is used within a method.
• ConstantPathNode#full_name{,_parts} will now raise an error if the receiver of the constant path is not itself a constant.
• The in keyword and the => operator now respect non-associativity.
• The .. and ... operators now properly respect non-associativity.

Changed

• Previously ... in blocks was accepted, but it is now properly rejected.
• BREAKING: librubyparser.* has been renamed to libprism.* in the C API.
• We now properly reject floats with exponent and rational suffixes.
• We now properly reject void value expressions.
• BREAKING: The --disable-static option has been removed from the C extension.
• The rescue modifier keyword is now properly parsed in terms of precedence.
• We now properly reject defining a numbered parameter method.
• BREAKING: MatchWriteNode now has a list of targets, which are local variable target nodes. This is instead of locals which was a constant list. This is to support writing to local variables outside the current scope. It has the added benefit of providing location information for the local variable targets.
• BREAKING: CaseNode has been split into CaseNode and CaseMatchNode, the latter is used for case ... in expressions.
• BREAKING: StringConcatNode has been removed in favor of using InterpolatedStringNode as a list.

v0.17.1

Changed

• Do not use constant nesting in RBI files.

v0.17.0

Added

• We now properly support forwarding arguments into arrays, like def foo(*) = [*].
• We now have much better documentation for the C and Ruby APIs.
• We now properly provide an error message when attempting to assign to numbered parameters from within regular expression named capture groups, as in /(?<_1>)/ =~ "".

Changed

• BREAKING: KeywordParameterNode is split into OptionalKeywordParameterNode and RequiredKeywordParameterNode. RequiredKeywordParameterNode has no value field.
• BREAKING: Most of the Prism:: APIs now accept a bunch of keyword options. The options we now support are: filepath, encoding, line, frozen_string_literal, verbose, and scopes. See the pull request for more details.
• BREAKING: Comments are now split into three different classes instead of a single class, and the type field has been removed. They are: InlineComment, EmbDocComment, and DATAComment.

v0.16.0

Added

• InterpolatedMatchLastLineNode#options and MatchLastLineNode#options are added, which are the same methods as are exposed on InterpolatedRegularExpressionNode and RegularExpressionNode.
• The project can now be compiled with wasi-sdk to expose a WebAssembly interface.
• ArgumentsNode#keyword_splat? is added to indicate if the arguments node has a keyword splat.
• The C API pm_prettyprint has a much improved output which lines up closely with Node#inspect.
• Prism now ships with RBS and RBI type signatures (in the /sig and /rbi directories, respectively).
• Prism::parse_comments and Prism::parse_file_comments APIs are added to extract only the comments from the source code.

Changed

• BREAKING: Multi{Target,Write}Node#targets is split up now into lefts, rest, and rights. This is to avoid having to scan the list in the case that there are splat nodes.
• Some bugs are fixed on Multi{Target,Write}Node accidentally creating additional nesting when not necessary.
• BREAKING: RequiredDestructuredParameterNode has been removed in favor of using MultiTargetNode in those places.
• BREAKING: HashPatternNode#assocs has been renamed to HashPatternNode#elements. HashPatternNode#kwrest has been renamed to HashPatternNode#rest.

v0.15.1

Changed

• Fix compilation warning on assigning to bitfield.

v0.15.0

Added

• BackReferenceReadNode#name is now provided.
• Index{Operator,And,Or}WriteNode are introduced, split out from Call{Operator,And,Or}WriteNode when the method is [].

Changed

• Ensure PM_NODE_FLAG_COMMON_MASK into a constant expression to fix compile errors.
• super(&arg) is now fixed.
• Ensure the last encoding flag on regular expressions wins.
• Fix the common whitespace calculation when embedded expressions begin on a line.
• Capture groups in regular expressions now scan the unescaped version to get the correct local variables.
• * and & are added to the local table when ... is found in the parameters of a method definition.

v0.14.0

Added

• Syntax errors are added for invalid lambda local semicolon placement.
• Lambda locals are now checked for duplicate names.
• Destructured parameters are now checked for duplicate names.
• Constant{Read,Path,PathTarget}Node#full_name and Constant{Read,Path,PathTarget}Node#full_name_parts are added to walk constant paths for you to find the full name of the constant.
• Syntax errors are added when assigning to a numbered parameter.
• Node::type is added, which matches the Node#type API.
• Magic comments are now parsed as part of the parsing process and a new field is added in the form of ParseResult#magic_comments to access them.

Changed

• BREAKING: Call*Node#name methods now return symbols instead of strings.
• BREAKING: For loops now have their index value considered as part of the body, so depths of local variable assignments will be increased by 1.
• Tilde heredocs now split up their lines into multiple string nodes to make them easier to dedent.

v0.13.0

Added

• BEGIN {} blocks are only allowed at the top-level, and will now provide a syntax error if they are not.
• Numbered parameters are not allowed in block parameters, and will now provide a syntax error if they are.
• Many more Ruby modules and classes are now documented. Also, many have been moved into their own files and autoloaded so that initial boot time of the gem is much faster.
• PM_TOKEN_METHOD_NAME is introduced, used to indicate an identifier that if definitely a method name because it has an ! or ? at the end.
• In the C API, arrays, assocs, and hashes now can have the PM_NODE_FLAG_STATIC_LITERAL flag attached if they can be compiled statically. This is used in CRuby, for example, to determine if a duphash/duparray instruction can be used as opposed to a newhash/newarray.
• Node#type is introduced, which returns a symbol representing the type of the node. This is useful for case comparisons when you have to compare against multiple types.

Changed

• BREAKING: Everything has been renamed to prism instead of yarp. The yp_/YP_ prefix in the C API has been changed to pm_/PM_. For the most part, everything should be find/replaceable.
• BREAKING: BlockArgumentNode nodes now go into the block field on CallNode nodes, in addition to the BlockNode nodes that used to be there. Hopefully this makes it more consistent to compile/deal with in general, but it does mean it can be a surprising breaking change.
• Escaped whitespace in %w lists is now properly unescaped.
• Node#pretty_print now respects pretty print indentation.
• Dispatcher was previously firing _leave events in the incorrect order. This has now been fixed.
• BREAKING: Visitor has now been split into Visitor and Compiler. The visitor visits nodes but doesn't return anything from the visit methods. It is suitable for taking action based on the tree, but not manipulating the tree itself. The Compiler visits nodes and returns the computed value up the tree. It is suitable for compiling the tree into another format. As such, MutationVisitor has been renamed to MutationCompiler.

v0.12.0

Added

• RegularExpressionNode#options and InterpolatedRegularExpressionNode#options are now provided. These return integers that match up to the Regexp#options API.
• Greatly improved Node#inspect and Node#pretty_print APIs.
• MatchLastLineNode and InterpolatedMatchLastLineNode are introduced to represent using a regular expression as the predicate of an if or unless statement.
• IntegerNode now has a base flag on it.
• Heredocs that were previously InterpolatedStringNode and InterpolatedXStringNode nodes without any actual interpolation are now StringNode and XStringNode, respectively.
• StringNode now has a frozen? flag on it, which respects the frozen_string_literal magic comment.
• Numbered parameters are now supported, and are properly represented using LocalVariableReadNode nodes.
• ImplicitNode is introduced, which wraps implicit calls, local variable reads, or constant reads in omitted hash values.
• YARP::Dispatcher is introduced, which provides a way for multiple objects to listen for certain events on the AST while it is being walked. This is effectively a way to implement a more efficient visitor pattern when you have many different uses for the AST.

Changed

• BREAKING: Flags fields are now marked as private, to ensure we can change their implementation under the hood. Actually querying should be through the accessor methods.
• BREAKING: AliasNode is now split into AliasMethodNode and AliasGlobalVariableNode.
• Method definitions on local variables is now correctly handled.
• Unary minus precedence has been fixed.
• Concatenating character literals with string literals is now fixed.
• Many more invalid syntaxes are now properly rejected.
• BREAKING: Comments now no longer include their trailing newline.