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2023-07-21genins: Use relative file path for printing forests.JSDurand
* chain/src/item/genins.rs: The absolute path is too long and unnecessary.
2023-07-21grammar/label: `set_end_option`JSDurand
* grammar/src/label.rs (set_end_option): This function replaces the old function `open_end`, as this new function is more general than the old one, and there is no specific situation where we only need to open the end of a node without the need to close the node in an `if` statement.
2023-07-21splone: splitting parents properly.JSDurand
* chain/src/item/default/splone.rs: Previouslt the function `split_node` used to split the parents of splitted nodes by an ugly logic. Now that is moved into a dedicated function, which properly handles the splitting of parents, including the case when the new node is open whereas the old node is closed, in which situation we ought to put the new node under the opened node only, as a closed node cannot contain an open node as a child by definition.
2023-07-21make changes install file for some reasonJSDurand
Huh.
2023-07-19graph: Add a future plan.JSDurand
* graph/src/lib.rs: Add a plan to reduce the number of bounds-checking. Hopefully this makes the package more efficient.
2023-07-19chain/atom/default: Make `print_nullables` public.JSDurand
* chain/src/atom/default.rs: Making this function public means I do not have to worry about it being unused.
2023-07-19genins: Fix the bug of forgetting to set ending positions.JSDurand
Previously a virtual fragment did not receive proper ending positions. This is now fixed. Additionally, after this fix, the function `set_pos` is only called with the last parameter set to `t`. Maybe I shall remove this parameter.
2023-07-19grammar/abnf: Fix a bug of repeatedly adding non-terminalsJSDurand
This bug caused a plain unambiguous grammar to become ambiguous. Funnily enough, this bug revealed a lot of bugs in the code for handling forests. I guess this is an unexpected surprise. :D
2023-07-18chain/src/item/default/mod.rs: Add a unit test for `set_pos`JSDurand
The function `set_pos` is kind of subtle and its behaviour needs a unit test so that we can be sure that it does not accidentally set the ending positions in a careless manner.
2023-07-18Fix the bug of incorrectly setting the end of forest nodesJSDurand
Previously when generating a fragment of the forest corresponding to the expansion of a non-terminal by a terminal, we incorrectly set the end of every node within it to be one plus the start, if the expansion happens due to a reduction. Now this mistake is fixed and the ending positions are correctly set.
2023-07-18chain/src/atom/default.rs: Add function to print nullablesJSDurand
* chain/src/atom/default.rs (print_nullables): This functions prints the nullables nodes of an atomic language. This is useful whe designing unit tests, as it enables us to know which rule positions are considered accepting by the underlying testing atomic language.
2023-07-18Fix a bug of unnecessarily cloning nodes.JSDurand
* chain/src/item/default/splone.rs: Previously when we split nodes, we always clone the parent if the labels differ. This turns out to be incorrect if the new label is open whereas the old label is closed. In that case, the old parent should not contain the new node as a child, as a closed node should not contain an open node. I am not yet entirely sure this fix is correct, so more test await us.
2023-07-18test.c: Save the forest to a file.JSDurand
This is not of much use right now, but can be helpful later.
2023-07-16Fix the bug of forgetting to check cloned nodes.JSDurand
In the process of splitting, cloning, and planting the forest, I forgot to check whether some cloned node of the node inquestion satisfy the condition. This used to cause forests that violate some fundamental assumptions. Now this is supposed to be fixed, but more tests await us.
2023-07-15test.c: I forgot to check if a malloc fails.JSDurand
* src/test.c: input is a malloc'ed pointer, which can be NULL due to malloc not being able to allocate enough memory. So I have to guard against this possibility. Aside: Why are some intermediate files added again?
2023-07-13genins: stop printing files if the directory does not existJSDurand
2023-07-13helper.h: delete a duplicated declarcationJSDurand
2023-07-13remove intermediate filesJSDurand
Those were added by accident.
2023-07-13Add config for cross-compilationJSDurand
2023-07-12Fix the bug of testing prefixes and plantingJSDurand
Previously the functions `is_prefix` and `plant` did not take the situation of packed nodes into considerations. That was because I only dealt with non-packed nodes in the past: the fragment to test for prefixes and for planting did not intersect the packed nodes in the forest, and the grammar is so simple that the fragments do not contain packed nodes. Then a test revealed this situation, so I have to fix this lack of considerations now. This commit attempts to fix this issue. From the newly added unit-tests, it seems that this fix works. :)
2023-07-12reformat some C functionsJSDurand
I do not use a tool to automatically format the codes, so sometimes the codes look ugly. This commit reformats the codes so that they look better and shorter on each line.
2023-07-08Finished the Emacs binding.JSDurand
Now the binding part is finished. What remains is a bug encountered when planting a fragment to the forest which intersects a packed node, which would lead to invalid forests. This will also cause problem when planting a packed fragment, but until now my testing grammars do not produce packed fragments, so this problem is not encountered yet. I am still figuring out efficient ways to solve this problem.
2023-07-08adding test grammar and test documentJSDurand
Adding a grammar and a document for testing purposes.
2023-06-18adjust autotools settingsJSDurand
Add more directories under control of autotools.
2023-06-18fixed the bugs of node duplications and left-open nodesJSDurand
There were two main issues in the previous version. One is that there are lots of duplications of nodes when manipulating the forest. This does not mean that labels repeat: by the use of the data type this cannot happen. What happened is that there were cloned nodes whose children are exactly equal. In this case there is no need to clone that node in the first place. This is now fixed by checking carefully before cloning, so that we do not clone unnecessary nodes. The other issue, which is perhaps more important, is that there are nodes which are not closed. This means that when there should be a reuction of grammar rules, the forest does not mark the corresponding node as already reduced. The incorrect forests thus caused is hard to fix: I tried several different approaches to fix it afterwards, but all to no avail. I also tried to record enough information to fix these nodes during the manipulations. It turned out that recording nodes is a dead end, as I cannot properly syncronize the information in the forest and the information in the chain-rule machine. Any inconsistencies will result in incorrect operations later on. The approach I finally adapt is to perform every possible reduction at each step. This might lead to some more nodes than what we need. But those are technically expected to be there after all, and it is easy to filter them out, so it is fine, from my point of view at the moment. Therefore, what remains is to filter those nodes out and connect it to the holy Emacs. :D
2023-06-02review of previous bug fixJSDurand
Generally speaking the algorithm now works correctly and produces the right shape of forest for the test ambiguous grammar as well. It does not correctly perform the "reductions". It seems that I deliberately disabled this part of the functionalities in a previous debugging tour. So I have to enable it again and see if it works.
2023-06-02abnf: a skeleton for an ABNF parserJSDurand
2023-06-02Fix a bug of duplication from planting after sploingJSDurand
I should have staged and committed these changes separately, but I am too lazy to deal with that. The main changes in this commit are that I added the derive macro that automates the delegation of the Graph trait. This saves a lot of boiler-plate codes. The second main change, perhaps the most important one, is that I found and tried to fix a bug that caused duplication of nodes. The bug arises from splitting or cloning a node multiple times, and immediately planting the same fragment under the new "sploned" node. That is, when we try to splone the node again, we found that we need to splone, because the node that was created by the same sploning process now has a different label because of the planting of the fragment. Then after the sploning, we plant the fragment again. This makes the newly sploned node have the same label (except for the clone index) and the same children as the node that was sploned and planted in the previous rounds. The fix is to check for the existence of a node that has the same set of children as the about-to-be-sploned node, except for the last one, which contains the about-to-be-planted fragment as a prefix. If that is the case, treat it as an already existing node, so that we do not have to splone the node again. This is consistent with the principle to not create what we do not need.
2023-06-02viz: finished decycle algorithmJSDurand
2023-06-02diaryJSDurand
* DIARY: Added a diary that might serve as a record of my thoughts.
2023-05-04Completed the procedural macro for deriving Graphs.JSDurand
The macro `graph_derive` can automatically write the boiler-plate codes for wrapper types one of whose sub-fields implements the `Graph` trait. The generated implementation will delegate the `Graph` operations to the sub-field which implements the `Graph` trait. I plan to add more macros, corresponding to various other graph-related traits, so that no such boiler-plate codes are needed, at least for my use-cases.
2023-03-02extra reductionsJSDurand
Finished the function of performing extra reductions. Still untested though.
2023-02-28Add a type Reducer for recording extra reductionsJSDurand
In the chain-rule machine, we need to skip through edges whose labels are "accepting", otherwise the time complexity will be high even for simple grammars. This implies that we will skip some "jumping up" in the item derivation forest. So we need to record these extra jumping up, in order to jump up at a later point. This Reducer type plays this role. But I still need more experiments to see if this approach works out as I intended.
2023-02-28Merge from masterJSDurand
2023-02-28Add no_item parameter.JSDurand
* chain/src/default.rs: * chain/src/lib.rs: Add a parameter that controls whether or not the chain-rule machine computes the item derivation forest as well. Sometimes we only need to recognize whether an input belongs to the grammar, but do not care about the derivations. This parameter can speed up the machine in that case.
2023-02-28default: add a planJSDurand
* chain/src/default.rs: Add a plan to fix things.
2023-02-28genins: fix minor error according to clippyJSDurand
* chain/src/item/genins.rs: Some minor fixes according to clippy.
2023-02-27before a major refactorJSDurand
I decide to adopt a new approach of recording and updating item derivation forests. Since this affects a lot of things, I decide to commit before the refactor, so that I can create a branch for that refactor.
2023-02-13Fix phantom edgesJSDurand
Previously there was a minor bug: if the chain-rule machine ended in a node without children, which node should be accepting because of edges that have no children and hence were ignored, then since the node has no children, it would be regarded as not accepting. Now this issue is fixed by introducting real or imaginary edges, where an imaginary edge is used to determine the acceptance of nodes without chidlren.
2023-02-12fix clone not changing the rootJSDurand
Previously cloning a node does not alter the root of the forest, while it should alter the root if the cloned node was the root. This would affect how we compare the equalities of forests. It indeed resulted in anomalies that were hard to solve.
2023-02-12Added the functionality of split or clone.JSDurand
I need more than the ability to clone nodes: I also need to split the nodes. Now this seems to be correctly added.
2023-02-03Finally produced the first correct forestJSDurand
Finally the prototype parser has produced the first correct forest. It is my first time to generate a correct forest, in fact, ever since the beginning of this project.
2023-01-28a prototype of an item derivation forestJSDurand
It seems to be complete now, but still awaits more tests to see where the errors are, which should be plenty, haha.
2023-01-22forest: clone correctlyJSDurand
Now the forest can detect if a node is packed or cloned, and correctly clones a node in those circumstances. But it still needs to be tested.
2023-01-20minor refactoringJSDurand
It seems the performance is indeed linear for a simple grammar. This is such a historical moment, for me, that I think it deserves a separate commit, haha.
2023-01-20chain: a prototype is added.JSDurand
I have an ostensibly working prototype now. Further tests are needed to make sure that the algorithm meets the time complexity requirement, though.
2023-01-13forest seems to be completedJSDurand
I seem to have finished the implementation of forests. Now it remains the implementation of the chain-rule machine, of which I have a rough plan now.
2023-01-13macro: try to write a macro for inhereting graphsJSDurand
An attempt to write a derive macro to automatically derive the various graph traits.
2023-01-11Record left-linear expansion and forest formatJSDurand
Now the grammar will record the left-linear expansions when generating the nondeterministic finite automaton frmo its rules, and will record whether an edge in the nondeterministic finite automaton comes from a left-linear expansion. The latter is needed because while performing a chain-rule derivation, we do not need the left-linear expanded derivations in the "first layer". This might well have been the root cause of the bad performance of the previous version of this package. Also I have figured out how to properly generate and handle parse forests while manipulating the "chain-rule machine".
2023-01-06Save before system restart.JSDurand
I am about to re-start my system, so I save before any crashes happen.