c009c5081d
Add AbstractConfigHashSet to consolidate default constructor parameters
2012-12-15 12:08:30 -06:00
0504334d08
Add missing @Override annotations
2012-12-14 09:42:02 -06:00
9b75ea79f9
Automatically reduce SemanticContext.AND/SemanticContext.OR with a single operand to the operand itself
2012-12-12 09:35:54 -06:00
e5e4402ea9
Merge remote branch 'sharwell/array-opt' with master
2012-12-12 09:28:55 -06:00
0e91700678
Stronger argument checks for ATN state and transition factory methods
2012-12-07 11:16:04 -06:00
9d3c763470
Add ATNSimulator.SERIALIZED_VERSION, resolved antlr/antlr4#95
2012-12-06 13:07:32 -06:00
64a4114850
Make debug fields compile-time constants to improve release runtime performance
2012-12-06 13:07:29 -06:00
886baaf773
Use separate lists in the serialized ATN for non-greedy states (cleaner, allows ATNs with twice as many states), resolves antlr/antlr4#96
2012-12-06 13:07:11 -06:00
b2ab7ab5ac
Rename master artifact to antlr4-master
2012-12-04 12:57:56 -06:00
380d3dadde
Create a ParseTreeVisitor interface, rename current abstract base class to AbstractParseTreeVisitor
2012-12-02 17:57:28 -06:00
cda9afdf55
update license everywhere.
2012-12-02 12:58:02 -08:00
9e3907d573
tokens now have token and char source to draw from. fix and close antlr/antlr4#88
2012-12-01 17:23:50 -08:00
fc79752748
Merge branch 'master' of github.com:antlr/antlr4
2012-12-01 14:38:33 -08:00
7049972ab7
escape [\r\n\t] in lexical error messages. Fixes antlr/antlr4#75
2012-12-01 14:36:59 -08:00
8a3298e075
Configure the maven-compiler-plugin in the parent POM, including the use of a bootstrap classpath to build a Java 6-compatible jar even when Java 7 is used to build it
2012-11-30 12:28:39 -06:00
af76d3294e
Configure the maven-source-plugin and maven-javadoc-plugin in the parent POM
2012-11-30 12:26:25 -06:00
f264609453
Updated POMs for deploying to sonotype
2012-11-27 23:34:36 -06:00
d68f75067d
Updated library and plugin references
2012-11-26 20:24:35 -06:00
5b4809deb6
Include source and javadoc jars in maven builds
2012-11-26 20:21:38 -06:00
769e0a418e
Updated javadoc
2012-11-26 20:19:09 -06:00
6369097630
Remove unnecessary dependency on ST4
2012-11-26 20:14:58 -06:00
90f4452dc4
Remove unused method TerminalNodeImpl.isErrorNode
2012-11-26 09:16:30 -06:00
6421e312a4
Remove the RuleContext.hashCode, equals, conflictsWith, and suffix methods since they produce unexpected behavior for ParserRuleContext and are no longer used for adaptivePredict
2012-11-26 02:24:16 -06:00
cd5192dd1a
Remove inherited and default properties from POMs
2012-11-23 13:46:13 -06:00
85f01bcce2
Updated module display names in POMs
2012-11-23 13:37:36 -06:00
121044d3b9
Remove inherited property from POMs
2012-11-23 13:36:27 -06:00
94803fa9f7
Specify parent POMs
2012-11-23 13:28:52 -06:00
f3ca54d350
Separate the EqualityComparator interface from the Set and Map implementations that need it
2012-11-21 19:30:41 -06:00
094f40c961
Remove unused field
2012-11-21 17:13:20 -06:00
fc7977e0d9
rename method
2012-11-20 15:09:27 -08:00
aba4034051
Evaluate preds in SLL before falling back to full context, avoid full context prediction if unique alternative results
2012-11-18 14:16:28 -06:00
691532190c
Extract method ParserATNSimulator.predicateDFAState
2012-11-18 14:15:16 -06:00
e366f00820
small improvement in error msg
2012-11-17 16:09:12 -08:00
a438c11734
Merge branch 'visitors' of git://github.com/sharwell/antlr4
2012-11-15 13:00:48 -08:00
ab5c9ede09
Merge branch 'set-interpreter' of git://github.com/sharwell/antlr4
2012-11-15 12:58:50 -08:00
a69ccb3c70
Merge branch 'token-stream-bugs' of git://github.com/sharwell/antlr4
2012-11-15 12:55:32 -08:00
b83a6bbeb0
Merge branch 'recognizer-local-state' of github.com:sharwell/antlr4
2012-11-14 17:07:42 -08:00
e1c8957192
rm two a.equals(a) bugs
2012-11-14 16:59:15 -08:00
18f5354d1b
Merge branch 'master' into token-stream-bugs
2012-11-14 15:07:33 -06:00
3a7a4907aa
Merge branch 'master' into set-interpreter
2012-11-14 14:45:50 -06:00
92ae0f0fa6
Merge branch 'recognizer-local-state'
2012-11-14 14:40:56 -06:00
d66962e860
Make ParseTreeVisitor more extensible, updated documentation
2012-11-14 13:07:02 -06:00
61ed3bc019
Revert "Simplify Parser.getExpectedTokens and DefaultErrorStrategy.getErrorRecoverySet"
...
This reverts commit d33172dce5
2012-11-04 17:02:41 -08:00
e5c2dfaac4
Kill box in tree dialog box makes dialog dispose of itself
2012-11-04 15:47:00 -08:00
d33172dce5
Simplify Parser.getExpectedTokens and DefaultErrorStrategy.getErrorRecoverySet
2012-11-04 13:35:10 -06:00
a70479ad0c
Fix ParserATNSimulator handling of EOF and rule stop states
2012-11-04 13:35:09 -06:00
68b9798d6f
LL1Analyzer adds EOF to expected tokens set if closure reaches end of start rule.
2012-11-04 13:35:09 -06:00
b917c01bba
Fix lexer error recovery could try to consume EOF
2012-11-04 11:30:03 -06:00
0c3ce2860e
Merge branch 'lexer-eof' of github.com:sharwell/antlr4
2012-11-03 17:52:27 -07:00
4480634f13
do exact LL ambigs for -diagnostics
2012-11-03 17:35:57 -07:00
d1795d205f
Revert "add option -exact-ambiguities to TestRig"
...
This reverts commit 400b58d4a0
2012-11-03 17:34:34 -07:00
400b58d4a0
add option -exact-ambiguities to TestRig
2012-11-03 16:40:23 -07:00
28e29e39dc
Remove code to explicitly add EOF transitions to rule stop states with no outgoing edges
2012-11-03 15:47:23 -05:00
fbaac8194b
Avoid calling consume() at EOF
2012-11-03 15:47:22 -05:00
c9890e8305
Throw IllegalStateException if the user tries to consume EOF
2012-11-03 15:47:22 -05:00
a9d4aeab71
no ? extends on rule ctx getters.
2012-11-03 08:57:49 -07:00
a828b99b59
Pass -Xlint -Xlint:-serial to javac (Maven build of runtime)
2012-11-01 18:11:35 -05:00
d220f90d3b
Remove generics from all runtime code which did not use them to provide type safety
2012-11-01 18:07:12 -05:00
3470978749
Updated naming conventions since RuleContext stores invoking states but PredictionContext stores return states
2012-11-01 13:47:44 -05:00
c2722b127a
Store return states instead of invoking states in PredictionContext instances
2012-11-01 13:35:55 -05:00
7bbc6c18be
Remove unchecked casts
2012-11-01 08:58:00 -05:00
ca38320d43
Simplify ATNConfigSet.toArray
2012-11-01 08:49:14 -05:00
eca9090fce
Remove tracing support from LexerATNSimulator - in process of moving it to dynamic instrumentation to eliminate runtime overhead in production use
2012-11-01 05:35:01 -05:00
d748271816
Remove getSpeculativeText since getText works again
2012-10-31 21:52:50 -05:00
a4ba562210
LexerATNSimulator adjusts the input position during a speculative predicate evaluation to accurately reflect the state where the predicate appears in the grammar
2012-10-31 21:52:41 -05:00
efa9ea7811
Simplify LexerATNSimulator to reduce duplicate code (duplicate instruction executions and duplicated code blocks)
2012-10-30 09:24:03 -05:00
bad2751a2c
Add edge suppression for lexer start state - required for left edge predicates
2012-10-30 08:46:42 -05:00
72c1fc8f6d
tweaks on comments
2012-10-29 12:47:09 -07:00
f554a2ed4f
Eliminate debug and dfa_debug overhead in LexerATNSimulator by making them compile-time constants
2012-10-29 13:32:02 -05:00
7bf50c8263
LexerATNSimulator uses explicit lower bound for DFAState.edges array
2012-10-29 13:32:02 -05:00
1269ce8d4e
Remove 2 field accesses per input character in LexerATNSimulator
2012-10-29 13:32:01 -05:00
0deadc688a
Remove unnecessary array indexing operation in execDFA
2012-10-29 13:32:00 -05:00
c34f0d6945
Remove duplicate array bounds check
2012-10-29 13:31:59 -05:00
afed3ac349
Remove unnecessary null checks
2012-10-29 13:31:58 -05:00
d17f919123
Updated NotNull annotations in LexerATNSimulator
2012-10-29 13:31:57 -05:00
5dace66921
DFAState.configs cannot be null
2012-10-29 13:31:57 -05:00
9873230f55
Correctness for lexer DFA with semantic predicate evaluation only requires suppressing single edges from the DFA
2012-10-29 13:31:56 -05:00
a115490d5e
Merge branch 'warnings-as-errors' of git://github.com/sharwell/antlr4
2012-10-29 11:27:46 -07:00
ee64790739
In lexer, configs which never reached a non-greedy decision state are fully greedy (unordered alternatives, longest match)
2012-10-29 13:14:51 -05:00
871db85ecb
Add field DecisionState.nonGreedy, computed in tool and serialized as one bit in the state type field
2012-10-29 13:14:50 -05:00
4adef1e455
Output from -atn flag shows the order of outgoing edges from decision states.
2012-10-28 11:17:39 -05:00
950f588ac0
Fix implementations: TokenStream interface says getText method returns non-null
2012-10-28 10:04:34 -05:00
d5341b55af
Merge branch 'encapsulation' of git://github.com/sharwell/antlr4
2012-10-24 12:59:46 -07:00
b89445e861
Merge branch 'maven-update' of git://github.com/sharwell/antlr4
2012-10-24 12:58:52 -07:00
cb0f5c0e51
Merge branch 'parsecancellationexception' of git://github.com/sharwell/antlr4
2012-10-24 12:58:26 -07:00
31c9fc33f1
Merge branch 'ordered-configs' of git://github.com/sharwell/antlr4
2012-10-24 10:51:56 -07:00
4f918f75bc
Merge branch 'get-reachable-target' of git://github.com/sharwell/antlr4
2012-10-24 10:41:46 -07:00
a80a6022ff
Update pom.xml
2012-10-22 12:19:24 -05:00
bb44db6397
Create a new ParseCancellationException for BailErrorStrategy. Derived from RuntimeException so existing handlers will still work.
2012-10-22 12:12:39 -05:00
36c63db299
Remove redundant casts, encapsulate fields in RecognitionException
2012-10-22 09:52:55 -05:00
4790ab76e1
Encapsulate fields in NoViableAltException and LexerNoViableAltException
2012-10-22 09:40:44 -05:00
1ae3c0104c
Simplify FailedPredicateException constructors, encapsulate fields
2012-10-22 09:18:29 -05:00
12b2c34946
Lexer uses strictly-ordered alternatives within a rule. Simplifies code, increases performance when non-terminal (lexer rules) depth is limited, and actually fixes non-greedy behavior
2012-10-21 22:04:38 -05:00
ed7d4b1dc1
fail option on predicates work.
2012-10-20 15:57:06 -07:00
ab6b341942
a few tweaks/comments.
2012-10-20 12:51:36 -07:00
52f1d3b6e5
Simplify getReachableTarget
2012-10-16 08:04:42 -05:00
1af9b4c338
Simplify and document non-greedy behavior in processAcceptConfigs
2012-10-16 08:01:46 -05:00
fb87e4c785
Another fix for non-greedy with closures
2012-10-16 07:53:23 -05:00
f9a63b8810
Fix bug in PredictionContext.arrayMerge
2012-10-15 14:57:06 -05:00
6fa853c14f
Fixes to LexerATNSimulator.closure, fixes to non-greedy positive closure
2012-10-15 02:01:07 -05:00
a40073a8cc
Merge remote-tracking branch 'antlr/master' into non-greedy
2012-10-15 01:58:15 -05:00
bbe77782db
Fix state checking in new non-greedy handling
2012-10-15 00:56:25 -05:00
aa2223cd6a
Fix assertion in PredictionContext.mergeArrays
2012-10-14 22:40:34 -05:00
7c221f13ed
Unify EMPTY_FULL_CTX_INVOKING_STATE and EMPTY_INVOKING_STATE (fixes an array indexing error during closure)
2012-10-14 22:25:11 -05:00
025cc6187a
Fix handling of non-greedy blocks in the lexer (uses regex-style non-greedy with unordered alternatives)
2012-10-14 21:46:57 -05:00
28b243cda5
BlockEndState links to start state for each block in the ATN (constructed during deserialization)
2012-10-14 21:45:35 -05:00
0d30a7a60b
Add ATN representation for non-greedy decisions
2012-10-14 21:45:34 -05:00
c68c058280
Implement Array2DHashSet.iterator
2012-10-14 21:45:29 -05:00
a0ffc84952
Merge branch 'master' into new-conflicting-alts
2012-10-14 18:47:32 -07:00
327a3a0100
Revert "update comment on consume()"
...
This reverts commit 27a8e5e521
2012-10-14 18:46:54 -07:00
54871d52ff
Revert "let it consume EOF since we sometimes need to match that during prediction"
...
This reverts commit 643edf0263
2012-10-14 18:46:43 -07:00
75a01636d0
got ambiguity reporting set right I think. fixed unit tests to force exact ambig detection.
2012-10-14 18:42:43 -07:00
e9c83c375f
cleanup and refactor conflict detection code into PredictionMode.
2012-10-14 17:37:15 -07:00
01bbce6952
full LL is always correct now, if slower. Stops prediction when resolvesToJustOneViableAlt(). SLL always uses heuristic
2012-10-14 13:25:34 -07:00
e7ece0e90a
got fast prediction termination with exactAmbig option that forces ANTLR to scan ahead until it identifies the true ambiguity.
2012-10-13 18:12:33 -07:00
d6d3f6f506
missing ambig alt in msg.
2012-10-12 18:07:37 -07:00
e69734c501
rm loopsSimulateTailRecursion
2012-10-12 17:49:43 -07:00
2ecfe2671a
size!=cardinality with BitSet.
2012-10-11 20:20:02 -07:00
f20cd82920
I need EOF edges on rule stop states for start rules.
2012-10-11 18:55:13 -07:00
1723bbd6f5
no debug
2012-10-11 18:54:26 -07:00
6654281aab
Merge branch 'master' into new-conflicting-alts
2012-10-11 18:52:22 -07:00
27a8e5e521
update comment on consume()
2012-10-11 18:51:58 -07:00
643edf0263
let it consume EOF since we sometimes need to match that during prediction
2012-10-11 18:50:02 -07:00
badb48a987
almost there.
2012-10-11 18:47:47 -07:00
058ed51349
initial impl
2012-10-11 13:09:08 -07:00
ad438a70ac
updated the comments for SLL.
2012-10-11 12:09:38 -07:00
ebe633a2cc
replace ctor for single ctx and don't merge wildcards when payloads aren't the same. fixes a unit test.
2012-10-08 15:26:56 -07:00
7bc16f40ea
Merge branch 'prediction-context-fixes' of git://github.com/sharwell/antlr4
2012-10-08 11:37:29 -07:00
d274650765
add null ptr so start rule it doesn't crash if you label the alternatives.
2012-10-08 11:32:38 -07:00
9cea095d81
Fix PredictionContext.mergeRoot placing states in the wrong order
2012-10-08 10:26:48 -05:00
f43e3614a8
Fix invoking states for recursion contexts
2012-10-08 07:38:06 -05:00
1defbdcc5d
Fix parent pointers in parse trees for nested recursion contexts
2012-10-07 23:01:26 -05:00
05f1dc0d26
tweak
2012-10-01 16:09:18 -07:00
69c20f3cf6
Only perform array copy when necessary
2012-10-01 15:30:28 -05:00
3457cc73ea
Significant updates to UnbufferedCharStream to meet the IntStream and CharStream interface requirements
2012-10-01 15:29:51 -05:00
cd25890486
Many updates to UnbufferedTokenStream:
...
* Fix LT(-1) after a seek operation
* Prevent consume() after EOF is reached
* Use the EOF token provided by the TokenSource (no need to create a new one)
* Fix assigned token index when marks are in place and when add() is called by derived types
* Throw exception for some invalid use of mark/release/seek
* Prevent fill() from adding multiple EOF tokens
* Remove diagnostic println
* Updated field documentation
* Implement getTokenSource
2012-10-01 15:24:00 -05:00
5637a04eec
Extensively document the IntStream, CharStream, and TokenStream interfaces
2012-10-01 14:52:30 -05:00
fa3e6e5867
Move CharStream.EOF to IntStream.EOF
2012-10-01 14:09:11 -05:00
fa7015f798
Move test helper methods out of exposed UnbufferedCharStream API
2012-10-01 11:53:04 -05:00
1c65bcd02f
Move test helper methods out of exposed UnbufferedTokenStream API
2012-10-01 08:25:46 -05:00
68dd847c04
* Fixed the unbuffered streams, which actually buffered everything
...
up by mistake. tweaked a few comments.
* Added a getter to IntStream for the token factory
2012-09-30 16:45:30 -07:00
9845e4ff20
rm redundant field.
2012-09-30 12:46:01 -07:00
ac29e6cdac
got unbufferedchar working I think.
2012-09-30 12:37:35 -07:00
db1bfa9c03
ParserATNSimulator wasn't using Token type param.
2012-09-29 16:58:51 -07:00
b56cd0f587
simplified delete configs algorithm.
2012-09-29 12:48:20 -07:00
e78ecd418a
rm isGreedy from DecisionState, but allow ATN construction for lexer to be nongreedy. error if '.' in parser. rm unit tests for parser nongreedy
2012-09-29 12:33:00 -07:00
c8a51ccfad
got wildcard working properly with recursion now!!! new unit test.
2012-09-27 12:22:16 -07:00
19782e6d77
first wack at fixing nongreedy (ACTION | .)* for recursive rules.
2012-09-27 11:44:51 -07:00
bca63c64aa
the test rig did not allow lexer only grammars; a regression.
2012-09-23 18:05:31 -07:00
262a331a5b
recursive rule bug in lexer; the lexer ATN simulator was not checking for empty stack at rule stop states.
2012-09-23 18:04:46 -07:00
7ed6cdcc4b
TerminalNodeImpl.getSourceInterval didn't fulfill the contract of SyntaxTree.getSourceInterval
2012-09-22 20:10:01 -05:00
62e005c841
Add nb-configuration.xml files
2012-09-22 19:49:11 -05:00
4abedb08dd
tweak comments
2012-09-22 12:29:22 -07:00
ce38d61f3a
Merge branch 'flexiblehashmap' of github.com:sharwell/antlr4
2012-09-16 15:11:29 -07:00
1ce6b69651
Fix build warnings in FlexibleHashMap, reduce entry size
2012-09-16 13:44:34 -05:00
e9656e35f9
Fix codegen problem where notset and wildcard transitions could match invalid tokens and/or EOF
2012-09-16 12:56:10 -05:00
aa2d893a77
got first draft of new "go/stop" algorithm.
2012-09-09 19:20:33 -07:00
89656989e6
add new map that lets me specify hashCode/equals
2012-09-09 18:55:47 -07:00
3c5dec1172
add large comment describing the decision rule for continuing analysis.
2012-09-09 17:56:42 -07:00
4bbbff4e8e
comments and a rename
2012-09-08 15:23:33 -07:00
0a961645be
fix comments; fix unit test
2012-09-08 13:13:00 -07:00
726fe2c983
Make sure to call visitErrorNode instead of visitTerminal when you have an ErrorNode. Also fix listener calls for case where _buildParseTrees is false (adds terminal as children of the rule nodes but won't actually construct the parse tree).
2012-09-08 14:57:30 -05:00
7586afff27
don't pass new term node
2012-09-08 10:21:42 -07:00
64cd79a18a
add return values
2012-09-08 10:14:10 -07:00
2b5c3723ba
update comments from Sam's version
2012-09-06 14:17:13 -07:00
38e0ad238d
Merge branch 'bail-error-propagation' of github.com:sharwell/antlr4 into main
2012-09-04 19:00:54 -07:00
8dd215f4b4
Merge branch 'deserialize' of github.com:sharwell/antlr4 into main
2012-09-04 18:59:38 -07:00
201db8b6d0
merge sam's pulls
2012-09-04 18:59:20 -07:00
3565efbbc3
Merge branch 'parserrulecontext-tostring' of github.com:sharwell/antlr4 into main
2012-09-04 18:37:03 -07:00
20aa8cf4ec
update comments
2012-08-27 12:05:05 -07:00
d9ad3d0bde
rm as unneeded.
2012-08-27 12:02:16 -07:00
60d99e62dc
rm ParseListener; tested the tracer with left recursive rules; weird but deterministic for entry events.
2012-08-27 11:22:42 -07:00
050b27cf65
tweak comment
2012-08-26 18:09:52 -07:00
1a52e0212e
tweak comment
2012-08-26 17:21:35 -07:00
e33e355d66
tweak comment
2012-08-26 16:32:28 -07:00
ad737ebdf6
tweak
2012-08-26 16:03:59 -07:00
d8b4d6403a
add doxy stuff
2012-08-25 11:40:55 -07:00
a51f1e7055
Updated documentation in BailErrorStrategy
2012-08-21 13:24:39 -05:00
4508f96ce4
BailErrorStrategy propagates the RecognitionException to the current rule context and it's parents
2012-08-21 13:23:03 -05:00
dd12508f5d
Add overloads of RuleContext.toStringTree and RuleContext.toString which take a list of rule names instead of a Recognizer instance. Remove ParserRuleContext override because it does the same thing as the base method.
2012-08-19 11:43:21 -05:00
6f38942e31
Add overload of Trees.toStringTree that takes a list of rule names instead of a Recognizer instance
2012-08-19 11:38:13 -05:00
17f7efca0a
Never serialize edges for rule stop states since they can be trivially derived during ATN deserialization
2012-08-17 10:51:44 -05:00
1d92b311ce
Merge branch 'master' into main
2012-08-13 12:38:00 -07:00
3bfcb7b38f
Add ATNSimulator.verifyATN to verify several assumptions about the deserialized ATN
2012-08-12 11:59:42 -05:00
2975c90fac
Serialize/deserialize the value of BlockStartState.endState
2012-08-12 11:58:26 -05:00
0c073062f7
TokensStartState is not really a BlockStartState because it doesn't have an associated end state
2012-08-12 11:56:07 -05:00
9b42acbf4d
ATNSimulator.deserialize computes values for PlusBlockStartState.loopBackState and StarLoopEntryState.loopBackState
2012-08-12 11:56:06 -05:00
83d8903f9f
ATNSimulator.deserialize derives rule stop states and (in the lexer) the outgoing transitions for those states
2012-08-12 10:27:48 -05:00
2d62b73a14
Merge branch 'master' into main
2012-08-06 17:11:38 -07:00
199e9892dc
Should be checking for ErrorNode (interface) instead of ErrorNodeImpl (class)
2012-08-06 15:01:43 -05:00
cb09dd6d09
Move RuleNode, TerminalNode, ErrorNode, TerminalNodeImpl, and ErrorNodeImpl to top-level types
2012-08-06 15:01:00 -05:00
492980de71
Merge branch 'master' into main
2012-08-04 21:31:37 -07:00
2947fe6a2a
Fix ATN optimizer leaving loop back state numbers in an inconsistent state
2012-08-04 22:22:51 -05:00
0d92c25056
improve hashCode
2012-08-04 14:38:57 -07:00
1bec176eaa
Impl Sam's no viable alt avoidance idea that chooses min alt that dips into outer context. unit test
2012-08-04 14:18:57 -07:00
6d12cbfddb
fix regression; didn't work with stdin
2012-08-04 13:50:52 -07:00
c2b49bd94e
pull in Sam's ATN alt collapsing optimizations with optimizeStates off as it causes a class cast exception.
2012-08-04 13:32:07 -07:00
c7d1ea7e23
Merge remote-tracking branch 'sharwell/atn-optimization'
2012-08-04 12:08:43 -07:00
b7b2a45c8b
update comments
2012-08-04 12:00:13 -07:00
b160a3b14d
caching more operations in mergeCache, updated comments, added null chk in front of mergeCache ops.
2012-08-04 11:04:21 -07:00
Sam Harwell
Terence Parr