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179 Commits

Author SHA1 Message Date
drh
4fa5952090 Enhance Lemon so that it remembers which -D command-line options are actually 
used in the grammar and includes a list of all such options in the header
of the generated output file.

FossilOrigin-Name: c47a4dbd24b8277c57b7a83a8c0aeac2bc8f6ab75d1b65ba5e1fa83d1868d95f
 2023-06-08 12:52:28 +00:00
drh
db08a6d13c Fix the parsing of C-style comments in Lemon, as reported by 
[forum:/forumpost/b6edc69548|forum post b6edc69548].  This has no affect
on SQLite itself.

FossilOrigin-Name: 201569e09b000919ccb463bd581fb2ecd5320e7f584fdb1bc2aaba111061d5c3
 2022-04-07 14:13:32 +00:00
drh
ddbb3cb5ec Remove code from lemon.c that was made superfluous by 
[1b22b42e59793af1|check-in 1b22b42e59793af1] in late 2017.

FossilOrigin-Name: 6d2f95a474a0c196f36317d88557bfb449ce125c1d012fc1844378c450697a05
 2022-01-14 23:28:11 +00:00
drh
1076130a5d Fix harmless static analyzer warnings in auxiliary build tools, mkkeywordhash.c 
and lemon.c.  No changes to the SQLite core.

FossilOrigin-Name: f2f279b2cc1c8b3b162058c33956be4037cd519715ac0c4290f10c58d2528f0a
 2021-10-04 16:14:51 +00:00
drh
6d77a2948e Patch lemon to fix "error" token handling, according ot 
[forum:/forumpost/e680f42f53090061|forum post e680f42f53090061].

FossilOrigin-Name: 106b5e5355a3836a9756333e6dcbb13f0878a5352dab00973b8f0900879bd724
 2021-08-27 11:26:37 +00:00
drh
9cffb0ffb9 Document the "%token" directive for Lemon. This directive has been in place 
for a while, but was previously undocumented.

FossilOrigin-Name: 36624d3740a8d095eee061bcc5037deabddb88a53444ec1a956a8af7684efa43
 2021-03-28 20:44:01 +00:00
drh
c2dbf35f49 Fix harmless typos in comments per 
[forum:/forumpost/7849e58dd5|forum post 7849e58dd5]

FossilOrigin-Name: d1e22e2f76cce7eb9f9029646176daef2d9e41c7bb1d3e1da182fbdd0096605c
 2021-01-07 16:10:14 +00:00
mistachkin
273ee15121 Fix harmless compiler warning seen with MSVC. 
FossilOrigin-Name: 4591ee03d7a1ef3f0f6ad0629493fdb7a1c0ddb3277a9e87aa244cb0ca770593
 2020-09-21 20:18:44 +00:00
drh
79d9af960b Attempt to silence harmless static analyzer warnings in Lemon and in the 
Lemon-generated parser.

FossilOrigin-Name: de8ce22a46c90afa5475cd24c28b7a82b26410dc72d662af2f9d9e5e528e0eec
 2020-09-20 12:10:28 +00:00
drh
18ef40e563 Fix harmless compiler warnings in Lemon. 
FossilOrigin-Name: 6c94ba4b1c16b676978808dcb24f63c2f22915af5dcfe9f635c037011affcf4b
 2020-09-16 16:55:56 +00:00
drh
2b75d3beb0 Fix a bug in Fossil that might cause it to crash if there is 
a multi-terminal token with a space following the "|" separator.
This does not affect SQLite.

FossilOrigin-Name: 430c5d1da57af452f236cc862139d84ab97b6020f6d327dae5268c58e6e83a87
 2020-09-05 06:21:54 +00:00
mistachkin
52cfe0312a Fix harmless compiler warning. 
FossilOrigin-Name: a711e8cd2c7b64e06241736ecef478ac64ddbe7b58e0933b6febba63f7fb06e1
 2020-09-01 19:02:52 +00:00
drh
512aa78ca2 In the Lemon output, add a prefix comment that explains that the output file 
is automatically generated and shows the name of the source file.

FossilOrigin-Name: d34caf3bb63d0512ea116a8c8c8343b76aa39441bd4b3e98231747a705b91d54
 2020-09-01 12:26:55 +00:00
drh
60c71b02ca Lemon updates: (1) include the #defines for all tokens in the generated C 
file, so that the C-file can be stand-alone.  (2) If the grammar begins with
a %include {...} directive on line one, make that directive the header for
the generated C file.  (3) Enhance the lemon.html documentation.

FossilOrigin-Name: 84d54eb35716174195ee7e5ac846f47308e5dbb0056e8ff568daa133860bab74
 2020-09-01 11:20:03 +00:00
drh
0a34cf551c In lemon, add "%if" and "%else" and allow boolean expressions as the 
argument to "%if", "%ifdef", and "%ifndef".

FossilOrigin-Name: 951d22b72f80de9e23df645abcc3d88ca1a275b46ea23b84152ef48716922b37
 2020-07-03 15:41:08 +00:00
drh
59c5679691 Fix incorrect SQL generated by the Lemon change of the previous check-in. 
FossilOrigin-Name: fccfb8a9ed3c1df9f23762bb8df6fdf36a21118899e3fae41f451169a5f2c08e
 2019-12-19 13:17:07 +00:00
drh
3e5f7fef33 Modify the parse.sql output file from Lemon so that the RULE table contains 
a column with the complete text of the rule.

FossilOrigin-Name: 329cbb372d4d77f774f01a87d104c40ef42d713afbe76195b65f5ca205c5ea7b
 2019-12-19 12:29:31 +00:00
drh
3ecc05bc3f Fix goofy string formatting in lemon.c that dates from the K&R-C days. 
FossilOrigin-Name: 48ba5e5a2227257cebafacbb09e9dd91d9b89ab2d52a8b4e4113c1d017d95f41
 2019-12-12 00:20:40 +00:00
drh
ce678c297b Improved tracing output from the LEMON-generated parser. 
FossilOrigin-Name: 4d6d2fc046d586a1e5989bbb2757f13d0371fbfad0acf45a0e2fd77dffd8d8f9
 2019-12-11 18:53:51 +00:00
drh
e94006eb42 Enhance LEMON to provide the ability to mark a rules as one that will never 
reduce due to intervention of actions.  Use this new capability to designate
the EXPLAIN rule as NEVER-REDUCES.

FossilOrigin-Name: 136cdefb2f7b582ff1771ac7f9e733dc24c357605526cbfb1834937697c8a922
 2019-12-10 20:41:48 +00:00
drh
61cb4ed7f1 Add comments in the parse.sql file to help demonstrate how rules are 
encoded.

FossilOrigin-Name: 2c4f714892327a1a9a303267b1f9685e310cca5dcea9c61287d95e26291b0506
 2019-11-29 13:01:57 +00:00
drh
1417c2f77f Fix the parse.sql output file so that it is readable into a database where 
foreign keys are enforced.

FossilOrigin-Name: 3a82c554c3bde4640df6865686f8f70e2c1e07c581fed4772b6b0a8ec1b10bb6
 2019-11-29 12:51:00 +00:00
drh
fe03dac236 Add the new -S option to the lemon parser generator to cause it to output 
SQL that describes the input grammar.

FossilOrigin-Name: 4dbd398d640852d4a696d68c72ee039968023d402a8053b5e6b4ef1d75e982a8
 2019-11-26 02:22:39 +00:00
mistachkin
acf6e08d20 Fix typo for one instance of line number handling in the Lemon tool. 
FossilOrigin-Name: 980be1730dc1239c63a107923bf2e32b4ec7d4bc31b9190e711cc35f18cc2bb4
 2019-09-11 15:25:26 +00:00
drh
010bdb4c79 Further improvements to parser speed by enlarging lookup tables to eliminate 
the need to do range checking on the index prior to lookup.

FossilOrigin-Name: 47d3e091ae49eb7947af5abef9b5b96b16b86d349e51fe0677795649be6db473
 2019-08-28 11:31:11 +00:00
drh
2e51716b15 Increase the size of the yy_lookahead table so that it is never necessary to 
down bounds checking on the index.

FossilOrigin-Name: bafd872398e58766e996963372c7acc03a1e20a6d39a3867ca45d3ea0ed2ac1d
 2019-08-28 02:09:47 +00:00
mistachkin
17df761a84 Fix harmless compiler warning in lemon. 
FossilOrigin-Name: 2da0eea02d128c37f2fbe764227ac526d3e993284516544adc0a216a035c5676
 2019-06-03 15:09:25 +00:00
mistachkin
d9bc6e8973 Fix some harmless compiler warnings. 
FossilOrigin-Name: ca068d82387fc3cda9d2050cedb4f9c61b6d9dc54f89015b4b2ee492243ed5c9
 2019-05-10 16:16:19 +00:00
drh
f135cb7d7f Fix an error message in the Lemon parser generator. 
FossilOrigin-Name: b6d7d42b7426622a26b67809cd1f21285fea120aa1897377b9946840463b41f1
 2019-04-30 14:26:31 +00:00
drh
e2dcc42e1f Fix a harmless memory leak in the Lemon parser generator utility program. 
FossilOrigin-Name: 1caff0fb0b2051e205e7a8cfd5dadf92680c52a88a441ded95b1ea6542db5f83
 2019-01-15 14:44:23 +00:00
drh
cfc45b1021 Reduce the size of the parser tables generated by Lemon by splitting the 
yyRuleInfo structure into separate yyRuleInfoLhs and yyRuleInfoNRhs arrays.

FossilOrigin-Name: 70fe8ec2ae3099b8773834c7ac2e56768addbecd57956ac523e71a7dc264049c
 2018-12-03 23:57:27 +00:00
mistachkin
c93c614543 Add a missing call to free() in Lemon. 
FossilOrigin-Name: 8b4cf33aafe09d9009119dcbd464b54be9605af5701002ee458819efa6e2e1f9
 2018-09-08 16:55:18 +00:00
drh
539e741e50 Enhance LEMON to track which symbols actually carry semantic content. 
Output the list of symbols that do not carry content at the end of the
report, but do not (yet) do anything else with the information.

FossilOrigin-Name: dcf2bafc159179859b91ffea3a4ebd70b5ca6de9e1d515eaf9afde8cfff26c6c
 2018-04-21 20:24:19 +00:00
drh
fb32c44e41 Add the %extra_context directive to lemon, as an alternative to %extra_argument. 
Use this to improve the performance of the parser.

FossilOrigin-Name: be47a6f5262a43f477700579512fe7112a0872faedcbbe5c3383d13a08af6440
 2018-04-21 13:51:42 +00:00
drh
9f88e6d861 Add the -dDIRECTORY command-line option to LEMON. 
FossilOrigin-Name: 9cd20475ff3b2ca1a58e441194c921780d25bdb9b9c744a6b4541b888194efb8
 2018-04-20 20:47:49 +00:00
drh
ed0c15b52e Lemon enhancements: (1) Do not allocate space for the 'error' non-terminal 
if it is not used. (2) Fix an off-by-one problem so that 'unsigned char' can
be used for symbol numbers if the number of symbols is 256.

FossilOrigin-Name: 3b7801acff91905d0e78e06121ebcf2664f6de5f605699dc8726ec9bcb558eb8
 2018-04-16 14:31:34 +00:00
drh
12f6839380 Enhance LEMON to show precendence of symbols and all rules in the report 
that is generated in parallel to the parser.

FossilOrigin-Name: 602fbd8149b53d8f0e9a223cc1aec912e7df03fca35071e8d707776ce225371c
 2018-04-06 19:12:55 +00:00
drh
4396c61959 In LEMON, fix an off-by-one error that can make the lookahead table one 
byte too smal.

FossilOrigin-Name: 93792bc58a2eccc7e07b14307388350bb376db32c5055b79a44e4fa8ff91d58e
 2017-12-27 15:21:16 +00:00
drh
0d9de99c5c Add support for measuring and reporting coverage of the parser state machine 
using the SQLITE_TESTCTRL_PARSER_COVERAGE test-control.

FossilOrigin-Name: 1253a872dbf48656d4efd588ab61223a5ac550d9b2b932249d6ba585276ba573
 2017-12-26 18:04:23 +00:00
drh
3a9d6c7156 Enhance LEMON so that it generates the action table in such a way that no 
range check is needed on the lookahead table to verify that the next input
token is valid.  This makes the lookahead table slightly larger (about 120
bytes) but helps the parser to run faster.

FossilOrigin-Name: 7eb0198d0102e97e4b7ad9e359d95985e55e09c510ea4b360265ac8feb9ed814
 2017-12-25 04:15:38 +00:00
drh
5c8241b875 In the LEMON-generated parser, rearrange the meanings of integer action codes 
so that reduce actions occur last.  This means that the most common case
(reduce actions) can be recognized with a single comparison operation, thus
speeding up the main parser loop, slightly.

FossilOrigin-Name: 7bfe7a360261ac7227840db49487c2f0fe338a2f1b868fcaada1e04a8d2b8f7a
 2017-12-24 23:38:10 +00:00
drh
59c435a015 Add the "%token" control to the lemon parser. Not currently used by SQLite. 
FossilOrigin-Name: a6e4c5ae8f29bc2e7f2088426341254e9281d19db9dc9a14abc376d56dad4c4b
 2017-08-02 03:21:11 +00:00
drh
6be95366c7 In the lemon-generated parser, store the number of symbols on the RHS of each 
rule as a negative number and add it to the stack pointer, rather than storing
the value as a positive and subtracting it.  This makes the parser faster.

FossilOrigin-Name: b362f0d8ed34839bf3b29d10ed0853ab94245fba135ccd28e619caa6ee6992d5
 2017-06-28 13:47:56 +00:00
drh
bd8fcc130a In the lemon-generated parser, automatically promote SHIFTREDUCE actions on 
nonterminal systems to pure REDUCE actions, for a performance enhancement.

FossilOrigin-Name: c46d94a8cde816ca383e771721ebd4900de77950cba700e35a26f70fd5b794a4
 2017-06-28 11:56:18 +00:00
drh
69bfa55279 Fix a subtle bug in Lemon discovered and reported on the mailing list 
by Kelvin Sherlock, who also suggested the correct fix.

FossilOrigin-Name: 304689f8acb53d68e1afed6e6c4332e78132e3d57071b8f94df0d13515b3b3d8
 2017-04-26 04:32:17 +00:00
drh
06f60d8e87 Remove end-of-line whitespace from lemon.c. 
FossilOrigin-Name: d78355c85f49e139f1ac1a660563865350f0e442652b7bc50b684398f81cc602
 2017-04-14 19:46:12 +00:00
drh
14d8855b8f Fix some left-over K&R-C constructs in lemon.c. No changes to the core. 
FossilOrigin-Name: a53799059d4ece246610b6c877ab7088ded3548cbca7149a03deea8ac0e27e68
 2017-04-14 19:44:15 +00:00
drh
96ada59cbb Fix harmless compiler warnings in the command-line shell and in Lemon. 
FossilOrigin-Name: afcdc4a60e357d171156e0de705bf7ad1b37daab
 2016-12-29 19:48:46 +00:00
drh
0f832ddc06 Fix a bug in destructor processing of Lemon. That has no impact on the 
SQLite grammar.  The bug was introduced by prior work to optimize the
Lemon-generated parser used by SQLite.

FossilOrigin-Name: f9035b8e2ea331801402bcb62b203ab092949770
 2016-08-16 16:46:40 +00:00
drh
701b68879c Improved comments on the lempar.c parser template. Adjust the 
YY_SHIFT_USE_DFLT constant in the Lemon-generated parser tables so as
to guarantee that it is always out of range of the yy_lookahead[] table.

FossilOrigin-Name: 83622f3f50030e4d6abafb99d99742928aaf157c
 2016-08-10 13:30:43 +00:00