-// priorities are all messy and dont get serialized
-// 1. Error messages
-// 2. Java MetaGrammar (proof of concept)
-// 3. Ivan's MetaGrammar
-// 4. Documentation format
-// - TIB
-
-// TODO: better API for interfacing with Java
-// TODO: error messages
-// TODO: integrate with TIB
-
-// Element
-// Walk
-// ParseTable / GSS
-// MetaGrammar (necessary/relevant?)
-// Tree<String> (cleanup?)
-// Union.SubUnion
-// Repeat
-
-// FEATURE: serialization of ParseTable's, generation of Java code
-// FEATURE: infer reject elements for literals
-// FEATURE: prefer whitespace higher up
-// FEATURE: full conjunctive and boolean grammars
-// FEATURE: "ambiguity modulo dropped fragments"? can this be checked for statically? eliminated statically?
-// - drop stuff during the parsing process (drop nodes)
-
-// LATER: Element<A> -- parameterize over the input token type? Makes a huge mess...
-// LATER: Go back to where Sequence is not an Element?
-// - The original motivation for making Sequence "first class" was the fact that
-// in order to do associativity right you need to have per-Sequence follow sets
-
-______________________________________________________________________________
+_____________________________________________________________________________
Immediately
+ - use 'a'-'z' or 'a-z' instead of [a-z]?
+ - EOF token?
+ - de-genericize?
+ - better toString() methods all around...
+ - foo.add(x)
+ foo.add(y.andnot(x)) ==> this is broken
+ - distinguish Conjunct from Sequence?
+ => !(Conjunct instanceof Reducible)
+ - document the assumption that Sequences that match epsilon
+ must have tag, and that ONLY that tag is returned
+ when the sequence matches epsilon
+ - try to avoid building the parts of the tree that end up getting
+ dropped
+ - double-check all the region logic
+
+ ..................................................
+
+ - paper/techreport opportunities
+ - interaction between RNGLR and follow restrictions
+ - "doomed node" optimization
+
+ - automatically collect time statistics and display
+ - serializable parse tables?
+ - better ambiguity reporting
+ - colorized tree-diffs?
+ - graphviz?
- - switch maximal to not-followed-by (~/~)
-
- - should Union.add() be there?
- - should Atom.top() be there?
+______________________________________________________________________________
+v1.1
+
+ - Treewalker code compiler?
+ - circular gramars?
+ s = A
+ A = A | "b"
+ - skeleton generator?
+ - precedes restrictions ("<-")
+ - MUST HAVE BETTER ERROR MESSAGES
+ - use for developing java15.g
+ - java15.g
+ - once this is ready, do big announcement
+ - broader regression testing (for stuff like error messages, etc)
+ - More topology untangling [later]
+ - grammar highlighting?
+ - Forest needs a "manual access" API
+ - the unwrap bit in Forest makes it really hard
+ to expose an API for forests
+ - rewriting language? multiple passes?
- - fix the location stuff, it's broken
- - decent/better error messages
+______________________________________________________________________________
+v1.2
+ - finalize metagrammar and rdp-op's
- write some grammars
- Java grammar
- TeX (math?)
- URL (RFC)
- RFC2822 (email message/headers)
- - Wiki grammar
+ - clean up the whole Walk situation (?)
+
______________________________________________________________________________
Soon
- - clean up the whole Walk situation
+ - serialization of parse tables
- - cleaner solution to "maximal"?
+ - "ambiguity modulo dropped fragments"?
+ - can this be checked statically?
+ - eliminated statically?
- - "lift" cases:
- - right now I can only lift the last child in a forest... begs
- the question of what the right representation for Forests is
- if we need to be able to do lift operations on it.
+ - substring parsing for better error messages
- Parameterized LR
- "Regular Right Part" grammars (NP Chapman, etc)
- Attribute unification
+ - inference of rejections for literals
+ - "prefer whitespace higher up" (?)
+
+ - Labeled edges on trees (associate a label with each slot in the
+ child array in Forest.Body? might make equality tough) --
+ equivalent to Feature Structures. Colon-labeling.
+
______________________________________________________________________________
Later
+ - understand and implement the RNGLR "kernel state" optimization.
+ The _Practical Early Parsing_ paper may help.
+
+ - Partly-Linear-PATR? (O(n^6) unification grammar)
+
- Implement a k-token peek buffer (for each state, see if it "dead
ends" during the next k Phases based solely on state -- ignoring
result SPPF)
nodes which are transient in the sense that they have only one
eligible reduction?
- - Implement "GLR syntactic predicates" -- the ability to do
- arbitrary lookahead (ie "followed-by" and "not-followed-by" for
- arbitrary patterns). This enables generalized longest-match and
- lets us drop the Maximal hack.
-
- Re-read Rekers, particularly the stuff on optimal sharing
- Isolate the Element objects from Parse.Table/GSS so we can move
- implement Johnstone's algorithm for "reduced, resolved LR
tables" to eliminate superfluous reductions on
epsilon-transitions.
+
+______________________________________________________________________________
+Neat Ideas
+
+ - Rekers & Koorn note that GLR Substring Parsing can be used to do
+ really elegant and generalized "autocompletion".
+
+
+______________________________________________________________________________
+Ideas for the Future
+
+- Incremental parse table construction
+- "lazy GLR" and "lazy trees" -> language with first-class CF matching
+ - perhaps linear boolean grammars instead? (linear time, quad space)
+- Forest parsing => chained parsers
+- unification parsing, attributes, etc
+- RRP grammars?
+- Take another stab at maximal-match? Nonterminal not-followed-by is
+ too strong.
+- Error recovery based on substring parsing
projects / sbp.git / blobdiff