3 -The p varialbe is now set up at the beginning of a scanner action, rather
4 than at the end. This leaves scanner actions free to manipulate p and
5 removes the need for the special holdTE and execTE (TE for tokend) versions
6 of hold and exec. It also removes the need to set p = tokend-1 immediately
7 before any control flow. We loose the ability to determine where in the
8 input stream a scanner action is executed, however this information is of
9 little use because it is primarily an artifact of the scanner implementation
10 (sometimes the last char, other times later on). The gains of of this change
11 are consistency and simplicity.
13 Ragel 5.21 - May 9, 2007
14 ========================
15 -Fixed an inconsistency in the value of p following an error. In the C
16 directly executable code (rlgen-cd -G2) p is left at the character where
17 the error occurred, which is correct. In all other code generators it was
18 left at the following character. This was fixed. Now in all code generators
19 p is left at the character where the error occurred.
20 -Bug fix: when fhold was used in scanner pattern actions which get executed
21 on the last character of the pattern (pattern matches which do not require
22 any lookahead), fhold was modifying p instead of tokend. This was fixed and
23 the patact.rl test was modified to cover the case.
24 -Fixed typos in the guide, improved the state action embedding operator
25 section and added subsections on the variable, import, and export
27 -Implemented a better solution than the pri hack for resolving the '-'
28 ambiguity: force a shortest match of term.
29 -Fixed bugs in the binary searching for condition keys in both the Ruby and
31 -Can now embed the negative sense of a condition. Added a language-
32 independent test case for this feature and the necessary transformation
34 -Added new condition embedding syntax:
35 expr inwhen cond - The transitions into the machine (starting transitions).
36 expr outwhen cond - The pending transitions out of the machine.
37 -The argument to the variable statement which affects the name of the current
38 state variable was changed from "curstate" to "cs" (the default name used
39 for the current state)
40 -Implemented the other variables names in the variable statement. Now all
41 variables (p, pe, cs, top, stack, act, tokstart, tokend) can be renamed.
42 -Parse errors in the intermediate XML file now cause the backend to exit
43 immediately rather then forge on. The recovery infrastructure isn't there
44 and segfaults are likely.
45 -When no input is given to the backend program, it should not print an error
46 message, it should just return a non-zero exit status. The assumption is
47 that the frontend printed an error.
48 -The version number is now included in the intermediate file. An error is
49 emitted if there is a mismatch.
50 -The alphabet type is now communicated from the frontend to the backend using
51 a one-word internal name instead of an array offset.
52 -The Ruby host language types had been just copied from Java. Reduced them to
53 two basic types: char and int, both signed with the usual C sizes.
55 Ragel 5.20 - Apr 7, 2007
56 ========================
57 -The cs variable is now always initialized, unless the "nocs" option is given
58 to the write init command. If there is no main machine, cs is initialized to
59 the entry point defined by the last machine instantiation.
60 -A number of fixes were made to the Ruby code generator.
61 -The frontend now scans ruby comments and regular expressions.
62 -A transformation for Ruby was added to the language-independent test suite.
63 The Ruby code generator passes on all the language-independent tests.
64 -A new Ruby test and two language-independent tests were added.
65 -Some portability fixes were made (Patches from Josef Goettgens and Aaron
67 -Fixed a make dependency bug which caused a problem for parallel building
68 (Patch from Jeremy Hinegardner).
70 Ragel 5.19 - Mar 14, 2007
71 =========================
72 -Added an import statement to ragel. This statement takes a literal string as
73 an argument, interprets it as a file name, then scrapes the file for
74 sequences of tokens that match the following forms. Tokens inside ragel
75 sections are ignored. An example is in test/import1.rl
79 "define" name lit_string
80 -Added an export mechanism which writes defines for single character machines
81 that have been tagged with the export keyword in their definition. Defines
82 are used for C, ints for D, Java and Ruby. Examples of the export feature
83 are in test/export*.rl.
84 -All machine instantiations are now always generated, even if they are not
85 referenced. In the backend, entry points for all instantiations are written
86 out alongside start, error and first final states.
87 -If the main machine is not present then do not emit an error. Generate the
88 machine without a start state and do not initialize cs in the write init
90 -Added an option -l to rlgen-cd which inhibits the writing of #line
92 -Added a new syntax for verbose embeddings. This adds parentheses:
94 Verbose embeddings without parentheses can make code difficult to read
95 because they force a space in the middle of an action embedding. There is a
96 tendency to associtate spaces with concatenation. Without syntax
97 highlighting to make it clear that the embedding type is a keyword, the
98 problem is especially bad. The danger is that a verbose embedding could be
99 read as an embedding of the keyword representing the empbedding type. With
100 parentheses, verbose embeddings read much more clearly.
101 -Conditions now have a forced order when more than one is executed on a
102 single character. Previously ordering relied on pointers, which caused
103 results to vary by compiler. Ordering is now done using conditon action
104 declaration order. This fixes the failure of cond4.rl which occured with
105 g++ 4.1 and other compiler versions.
106 -In the port from flex to ragel, the name separator :: in Ragel code was
108 -In the examples directory switched from rlcodegen to rlgen-cd. Silenced a
109 warning in statechart.rl.
110 -In the root makefile the distclean target was fixed. It was calling clean in
111 the subdirs. In docs, the clean target was not deleting the new manpages for
112 the rlgen-* programs. Fixed.
113 -Portability and other fixes from Josef Goettgens were applied.
114 -The @datadir@ and @mandir@ variables are made use of in doc/Makefile.in for
115 specifying where documentation should be installed. Patch from Marcus
118 Ragel 5.18 - Feb 13, 2007
119 =========================
120 -There is now a 100% correspondence between state id numbers in the
121 intermediate XML file, Graphviz dot files and generated code. This was
122 achieved by moving code which determines if the error state is necessary
123 into the frontend, and then assigning state numbers before writing out the
125 -Backened class structure was reorganized to make it easier to add new code
126 generators without having to also modify the existing code generators.
127 -The C and D code generation executable was changed to rlgen-cd.
128 -The Java code generation was split out into it's own exectuable (rlgen-java)
129 to allow it to freely diverge from the C/D-based code generation.
130 -The graphviz dot file generation was also split out to it's own executable
132 -The Ruby code generation patch from Victor Hugo Borja was added. This is
133 highly experimental code and is not yet completely functional. It is in the
134 executable rlgen-ruby.
135 -The problem with large state machine machines in Java was fixed. This
136 problem was discovered by Colin Fleming, who also contributed a patch.
137 Rather than specify arrays as comma-separated lists of literals, array
138 initialization is now done in a static function. This is the approach used
139 by the Java compiler. Unlike the compiler Ragel is careful split large
140 initilization functions.
141 -The manual was expanded and reorganized somewhat.
142 -Eliminated per-example directories in examples/.
143 -Made some fixes to the pullscan.rl example.
144 -In the frontend CR characters are now treated as whitespace.
145 -Updated to the latest aapl. This completely eliminates the shallowCopy
146 function. With that, a definitive memory leak is fixed.
147 -Control codes with escape sequences are now printable characters (-p
148 option). Also, the space character is now printed as SP.
149 -Fixed the null dereference and consequential segfault which occurred when
150 trying to create empty machines with [] and // and /a[]b/.
151 -Fixed the segfault which occured when a machine reference failed.
152 -Discontinuing ragel.spec. It is more appropriate for this to be written by
153 package maintenance developers.
155 Ragel 5.17 - Jan 28, 2007
156 =========================
157 -The scanners and parsers in both the frontend and backend programs were
158 completely rewritten using Ragel and Kelbt.
159 -The '%when condition' syntax was functioning like '$when condition'. This
161 -In the Vim syntax file fixes to the matching of embedding operators were
162 made. Also, improvements to the sync patterns were made.
163 -Added pullscan.rl to the examples directory. It is an example of doing
164 pull-based scanning. Also, xmlscan.rl in rlcodegen is a pull scanner.
165 -The introduction chapter of the manual was improved. The manually-drawn
166 figures for the examples were replaced with graphviz-drawn figures.
168 Ragel 5.16 - Nov 20, 2006
169 =========================
170 -Policy change: the fhold and fexec directives did not function correctly in
171 scanner pattern actions. In this context manipulations of p may be lost or
172 made invalid. In the previous version of Ragel they were banned because of
173 this. Instead of banning these directives they have been fixed. The fexec
174 and fhold directives now manipulate tokend, which is now always used to
175 update p when the action terminates.
177 Ragel 5.15 - Oct 31, 2006
178 =========================
179 -A language independent test harness was introduced. Test cases can be
180 written using a custom mini-language in the embedded actions. This
181 mini-language is then translated to C, D and Java when generating the
182 language-specific test cases.
183 -Several existing tests have been ported to the language-independent format
184 and a number of new language-independent test cases have been added.
185 -The state-based embedding operators which access states that are not the
186 start state and are not final (the 'middle' states) have changed. They
188 <@/ eof action into middle states
189 <@! error action into middle states
190 <@^ local error action into middle states
191 <@~ to-state action into middle states
192 <@* from-state action into middle states
194 <>/ eof action into middle states
195 <>! error action into middle states
196 <>^ local error action into middle states
197 <>~ to-state action into middle states
198 <>* from-state action into middle states
199 -The verbose form of embeddings using the <- operator have been removed.
200 This syntax was difficult to remember.
201 -A new verbose form of state-based embedding operators have been added.
202 These are like the symbol versions, except they replace the symbols:
204 with literal keywords:
206 -The following words have been promoted to keywords:
207 when eof err lerr to from
208 -The write statment now gets its own lexical scope in the scanner to ensure
209 that commands are passed through as is (not affected by keywords).
210 -Bug fix: in the code generation of fret in scanner actions the adjustment to
211 p that is needed in some cases (dependent on content of patterns) was not
213 -The fhold directive, which decrements p, cannot be permitted in the pattern
214 action of a scanner item because it will not behave consistently. At the end
215 of a pattern action p could be decremented, set to a new value or left
216 alone. This depends on the contents of the scanner's patterns. The user
217 cannot be expected to predict what will happen to p.
218 -Conditions in D code require a cast to the widec type when computing widec.
219 -Like Java, D code also needs if (true) branches for control flow in actions
220 in order to fool the unreachable code detector. This is now abstracted in
221 all code generators using the CTRL_FLOW() function.
222 -The NULL_ITEM value in java code should be -1. This is needed for
223 maintaining tokstart.
225 Ragel 5.14 - Oct 1, 2006
226 ========================
227 -Fixed the check for use of fcall in actions embedded within longest match
228 items. It was emitting an error if an item's longest-match action had an
229 fcall, which is allowed. This bug was introduced while fixing a segfault in
231 -A new minimization option was added: MinimizeMostOps (-l). This option
232 minimizes at every operation except on chains of expressions and chains of
233 terms (eg, union and concat). On these chains it minimizes only at the last
234 operation. This makes test cases with many states compile faster, without
235 killing the performance on grammars like strings2.rl.
236 -The -l minimiziation option was made the default.
237 -Fixes to Java code: Use of the fc value did not work, now fixed. Static data
238 is now declared with the final keyword. Patch from Colin Fleming. Conditions
239 now work when generating Java code.
240 -The option -p was added to rlcodegen which causes printable characters to be
241 printed in GraphViz output. Patch from Colin Fleming.
242 -The "element" keyword no longer exists, removed from vim syntax file.
243 Updated keyword highlighting.
244 -The host language selection is now made in the frontend.
245 -Native host language types are now used when specifying the alphtype.
246 Previously all languages used the set defined by C, and these were mapped to
247 the appropriate type in the backend.
249 Ragel 5.13 - Sep 7, 2006
250 ========================
251 -Fixed a careless error which broke Java code generation.
253 Ragel 5.12 - Sep 7, 2006
254 ========================
255 -The -o flag did not work in combination with -V. This was fixed.
256 -The split code generation format uses only the required number of digits
257 when writing out the number in the file name of each part.
258 -The -T0, -F0 and -G0 codegens should write out the action list iteration
259 variables only when there are regular, to state or from state actions. The
260 code gens should not use anyActions().
261 -If two states have the same EOF actions, they are written out in the finish
263 -The split and in-place goto formats would sometimes generate _out when it is
264 not needed. This was fixed.
265 -Improved the basic partitioning in the split code gen. The last partition
266 would sometimes be empty. This was fixed.
267 -Use of 'fcall *' was not causing top to be initialized. Fixed.
268 -Implemented a Java backend, specified with -J. Only the table-based format
270 -Implemented range compression in the frontend. This has no effect on the
271 generated code, however it reduces the work of the backend and any programs
272 that read the intermediate format.
274 Ragel 5.11 - Aug 10, 2006
275 =========================
276 -Added a variable to the configure.in script which allows the building of
277 the parsers to be turned off (BUILD_PARSERS). Parser building is off by
278 default for released versions.
279 -Removed configure tests for bison defines header file. Use --defines=file
281 -Configure script doesn't test for bison, flex and gperf when building of the
282 parsers is turned off.
283 -Removed check for YYLTYPE structure from configure script. Since shipped
284 code will not build parsers by default, we don't need to be as accomodating
285 of other versions of bison.
286 -Added a missing include that showed up with g++ 2.95.3.
287 -Failed configure test for Objective-C compiler is now silent.
289 Ragel 5.10 - Jul 31, 2006
290 =========================
291 -Moved the check for error state higher in the table-based processing loop.
292 -Replaced naive implementations of condition searching with proper ones. In
293 the table-based formats the searching is also table-based. In the directly
294 executed formats the searching is also directly executable.
295 -The minimization process was made aware of conditions.
296 -A problem with the condition implementation was fixed. Previously we were
297 taking pointers to transitions and then using them after a call to
298 outTransCopy, which was a bad idea because they may be changed by the call.
299 -Added test mailbox3.rl which is based on mailbox2.rl but includes conditions
300 for restricting header and message body lengths.
301 -Eliminated the initial one-character backup of p just before resuming
303 -Added the -s option to the frontend for printing statistics. This currently
304 includes just the number of states.
305 -Sped up the generation of the in-place goto-driven (-G2) code style.
306 -Implemented a split version of in-place goto-driven code style. This code
307 generation style is suitable for producing fast implementations of very
308 large machines. Partitioning is currently naive. In the future a
309 high-quality partitioning program will be employed. The flag for accessing
310 this feature is -Pn, where n is the number of partitions.
311 -Converted mailbox1.rl, strings2.rl and cppscan1.rl tests to support the
312 split code generation.
313 -Fixes and updates were made to the runtests script: added -c for compiling
314 only, changed the -me option to -e, and added support for testing the split
317 Ragel 5.9 - Jul 19, 2006
318 ========================
319 -Fixed a bug in the include system which caused malformed output from the
320 frontend when the include was made from a multi-line machine spec and the
321 included file ended in a single line spec (or vice versa).
322 -Static data is now const.
323 -Actions which referenced states but were not embedded caused the frontend to
325 -Manual now built with pdflatex.
326 -The manual was reorganized and expanded. Chapter sequence is now:
327 Introduction, Constructing Machines, Embedding Actions, Controlling
328 Nondeterminism and Interfacing to the Host program.
330 Ragel 5.8 - Jun 17, 2006
331 ========================
332 -The internal representation of the alphabet type has been encapsulated
333 into a class and all operations on it have been defined as C++ operators.
334 -The condition implementation now supports range transitions. This allows
335 conditions to be embedded into arbitrary machines. Conditions are still
337 -More condition embedding operators were added
338 1. Isolate the start state and embed a condition into all transitions
341 2. Embed a condition into all transitions:
342 when cond OR $when cond OR $?cond
343 3. Embed a condition into pending out transitions:
345 -Improvements were made to the determinization process to support pending out
347 -The Vim sytax file was fixed so that :> doesn't cause the match of a label.
348 -The test suite was converted to a single-file format which uses less disk
349 space than the old directory-per-test format.
351 Ragel 5.7 - May 14, 2006
352 ========================
353 -Conditions will not be embedded like actions because they involve a
354 manipulation of the state machine they are specified in. They have therefore
355 been taken out of the verbose action embedding form (using the <- compound
356 symbol). A new syntax for specifying conditions has been created:
357 m = '\n' when {i==4};
358 -Fixed a bug which prevented state machine commands like fcurs, fcall, fret,
359 etc, from being accounted for in from-state actions and to-state actions.
360 This prevented some necessary support code from being generated.
361 -Implemented condition testing in remaining code generators.
362 -Configure script now checks for gperf, which is required for building.
363 -Added support for case-insensitive literal strings (in addition to regexes).
364 A case-insensitive string is made by appending an 'i' to the literal, as in
366 -Fixed a bug which caused all or expressions inside of all regular
367 expressions to be case-insensitive. For example /[fo]o bar/ would make the
368 [fo] part case-insensitive even though no 'i' was given following the
371 Ragel 5.6 - Apr 1, 2006
372 =======================
373 -Added a left-guarded concatenation operator. This operator <: is equivalent
374 to ( expr1 $1 . expr2 >0 ). It is useful if you want to prefix a sequence
375 with a sequence of a subset of the characters it matches. For example, one
376 can consume leading whitespace before tokenizing a sequence of whitespace
377 separated words: ( ' '* <: ( ' '+ | [a-z]+ )** )
378 -Removed context embedding code, which has been dead since 5.0.
380 Ragel 5.5 - Mar 28, 2006
381 ========================
382 -Implemented a case-insensitive option for regular expressions: /get/i.
383 -If no input file is given to the ragel program it reads from standard input.
384 -The label of the start state has been changed from START to IN to save on
385 required screen space.
386 -Bug fix: \0 was not working in literal strings, due to a change that reduced
387 memory usage by concatenating components of literal strings. Token data
388 length is now passed from the scanner to the paser so that we do not need to
389 rely on null termination.
391 Ragel 5.4 - Mar 12, 2006
392 ========================
393 -Eliminated the default transition from the frontend implementation. This
394 default transition was a space-saving optimization that at best could reduce
395 the number of allocated transitions by one half. Unfortunately it
396 complicated the implementation and this stood in the way of introducing
397 conditionals. The default transition may be reintroduced in the future.
398 -Added entry-guarded concatenation. This operator :>, is syntactic sugar
399 for expr1 $0 . expr >1. This operator terminates the matching of the first
400 machine when a first character of the second machine is matched. For
401 example in any* . ';' we never leave the any* machine. If we use any* :> ';'
402 then the any* machine is terminiated upon matching the semi-colon.
403 -Added finish-guarded concatenation. This operator :>>, is syntactic sugar
404 for expr1 $0 . expr @1. This operator is like entry guarded concatenation
405 except the first machine is terminated when the second machine enters a
406 final state. This is useful for delaying the guard until a full pattern is
407 matched. For example as in '/*' any* :>> '*/'.
408 -Added strong subtraction. Where regular subtraction removes from the first
409 machine any strings that are matched by the second machine, strong
410 subtraction removes any strings from the first that contain any strings of
411 the second as a substring. Strong subtraction is syntactic sugar for
412 expr1 - ( any* expr2 any* ).
413 -Eliminated the use of priorities from the examples. Replaced with
414 subtraction, guarded concatenation and longest-match kleene star.
415 -Did some initial work on supporting conditional transitions. Far from
416 complete and very buggy. This code will only be active when conditionals are
419 Ragel 5.3 - Jan 27, 2006
420 ========================
421 -Added missing semi-colons that cause the build to fail when using older
423 -Fix for D code: if the contents of an fexec is a single word, the generated
424 code will get interpreted as a C-style cast. Adding two brackets prevents
425 this. Can now turn eliminate the "access this.;" in cppscan5 that was used to
426 get around this problem.
427 -Improved some of the tag names in the intermediate format.
428 -Added unsigned long to the list of supported alphabet types.
429 -Added ids of actions and action lists to XML intermediate format. Makes it
431 -Updated to latest Aapl package.
433 Ragel 5.2 - Jan 6, 2006
434 ========================
435 -Ragel emits an error if the target of fentry, fcall, fgoto or fnext is inside
436 a longest match operator, or if an action embedding in a longest match
437 machine uses fcall. The fcall command can still be used in pattern actions.
438 -Made improvements to the clang, rlscan, awkemu and cppscan examples.
439 -Some fixes to generated label names: they should all be prefixed with _.
440 -A fix to the Vim syntax highlighting script was made
441 -Many fixes and updates to the documentation. All important features and
442 concepts are now documented. A second chapter describing Ragel's use
445 Ragel 5.1 - Dec 22, 2005
446 ========================
447 -Fixes to the matching of section delimiters in Vim syntax file.
448 -If there is a longest match machine, the tokend var is now initialized by
449 write init. This is not necessary for correct functionality, however
450 prevents compiler warnings.
451 -The rlscan example was ported to the longest match operator and changed to
453 -Fix to the error handling in the frontend: if there are errors in the lookup
454 of names at machine generation time then do not emit anything.
455 -If not compiling the full machine in the frontend (by using -M), avoid
456 errors and segfaults caused by names that are not part of the compiled
458 -Longest match bug fix: need to init tokstart when returing from fsm calls
459 that are inside longest match actions.
460 -In Graphviz drawing, the arrow into the start state is not a real
461 transition, do not draw to-state actions on the label.
462 -A bug fix to the handling of non-tag data within an XML tag was made.
463 -Backend exit value fixed: since the parser now accepts nothing so as to
464 avoid a redundant parse error when the frontend dies, we must force an
465 error. The backend should now be properly reporting errors.
466 -The longest match machine now has it's start state set final. An LM machine
467 is in a final state when it has not matched anything, when it has matched
468 and accepted a token and is ready for another, and when it has matched a
469 token but is waiting for some lookahead before determining what to do about
470 it (similar to kleene star).
471 -Element statement removed from some tests.
472 -Entry point names are propagated to the backend and used to label the entry
473 point arrows in Graphviz output.
475 Ragel 5.0 - Dec 17, 2005
476 ========================
477 (additional details in V5 release notes)
478 -Ragel has been split into two executables: A frontend which compiles
479 machines and emits them in an XML format, and a backend which generates code
480 or a Graphviz dot file from the XML input. The purpose of this split is to
481 allow Ragel to interface with other tools by means of the XML intermediate
482 format and to reduce complexity by strictly separating the previously
483 entangled phases. The intermediate format will provide a better platform
484 inspecting compiled machines and for extending Ragel to support other host
486 -The host language interface has been reduced significantly. Ragel no longer
487 expects the machine to be implemented as a structure or class and does not
488 generate functions corresponding to initialization, execution and EOF.
489 Instead, Ragel just generates the code of these components, allowing all of
490 them to be placed in a single function if desired. The user specifies a
491 machine in the usual manner, then indicates at which place in the program
492 text the state machine code is to be generated. This is done using the write
493 statement. It is possible to specify to Ragel how it should access the
494 variables it needs (such as the current state) using the access statement.
495 -The host language embedding delimiters have been changed. Single line
496 machines start with '%%' and end at newline. Multiline machines start with
497 '%%{' and end with '}%%'. The machine name is given with the machine
498 statement at the very beginning of the specification. This purpose of this
499 change is to make it easier separate Ragel code from the host language. This
500 will ease the addition of supported host languages.
501 -The structure and class parsing which was previously able to extract a
502 machine's name has been removed since this feature is dependent on the host
503 language and inhibits the move towards a more language-independent frontend.
504 -The init, element and interface statements have been made obsolete by the
505 new host language interface and have been removed.
506 -The fexec action statement has been changed to take only the new position to
507 move to. This statement is more useful for moving backwards and reparsing
508 input than for specifying a whole new buffer entirely and has been shifted
509 to this new use. Giving it only one argument also simplifies the parsing of
510 host code embedded in a Ragel specification. This will ease the addition of
511 supported host languages.
512 -Introduced the fbreak statement, which allows one to stop processing data
513 immediately. The machine ends up in the state that the current transition
514 was to go to. The current character is not changed.
515 -Introduced the noend option for writing the execute code. This inhibits
516 checking if we have reached pe. The machine will run until it goes into the
517 error state or fbreak is hit. This allows one to parse null-terminate
518 strings without first computing the length.
519 -The execute code now breaks out of the processing loop when it moves into
520 the error state. Previously it would run until pe was hit. Breaking out
521 makes the noend option useful when an error is encountered and allows
522 user code to determine where in the input the error occured. It also
523 eliminates needlessly iterating the input buffer.
524 -Introduced the noerror, nofinal and noprefix options for writing the machine
525 data. The first two inhibit the writing of the error state and the
526 first-final state should they not be needed. The noprefix eliminates the
527 prefixing of the data items with the machine name.
528 -Support for the D language has been added. This is specified in the backend
530 -Since the new host language interface has been reduced considerably, Ragel
531 no longer needs to distinguish between C-based languages. Support for C, C++
532 and Objective-C has been folded into one option in the backend: -C
533 -The code generator has been made independent of the languages that it
534 supports by pushing the language dependent apsects down into the lower
535 levels of the code generator.
536 -Many improvements to the longest match construction were made. It is no
537 longer considered experimental. A longest match machine must appear at the
538 top level of a machine instantiation. Since it does not generate a pure
539 state machine (it may need to backtrack), it cannot be used as an operand to
541 -References to the current character and current state are now completely
542 banned in EOF actions.
544 Ragel 4.2 - Sep 16, 2005
545 ========================
546 (additional details in V4 release notes)
547 -Fixed a bug in the longest match operator. In some states it's possible that
548 we either match a token or match nothing at all. In these states we need to
549 consult the LmSwitch on error so it must be prepared to execute an error
550 handler. We therefore need to init act to this error value (which is zero).
551 We can compute if we need to do this and the code generator emits the
552 initialization only if necessary.
553 -Changed the definition of the token end of longest match actions. It now
554 points to one past the last token. This makes computing the token length
555 easier because you don't have to add one. The longest match variables token
556 start, action identifier and token end are now properly initialized in
557 generated code. They don't need to be initialized in the user's code.
558 -Implemented to-state and from-state actions. These actions are executed on
559 transitions into the state (after the in transition's actions) and on
560 transitions out of the state (before the out transition's actions). See V4
561 release notes for more information.
562 -Since there are no longer any action embedding operators that embed both on
563 transitions and on EOF, any actions that exist in both places will be there
564 because the user has explicitly done so. Presuming this case is rare, and
565 with code duplication in the hands of the user, we therefore give the EOF
566 actions their own action switch in the finish() function. This is further
567 motivated by the fact that the best solution is to do the same for to-state
568 and from-state actions in the main loop.
569 -Longest match actions can now be specified using a named action. Since a
570 word following a longest match item conflicts with the concatenation of a
571 named machine, the => symbol must come immediately before a named action.
572 -The longest match operator permits action and machine definitions in the
573 middle of a longest match construction. These are parsed as if they came
574 before the machine definition they are contained in. Permitting action and
575 machine definitions in a longest match construction allows objects to be
576 defined closer to their use.
577 -The longest match operator can now handle longest match items with no
578 action, where previously Ragel segfaulted.
579 -Updated to Aapl post 2.12.
580 -Fixed a bug in epsilon transition name lookups. After doing a name lookup
581 the result was stored in the parse tree. This is wrong because if a machine
582 is used more than once, each time it may resolve to different targets,
583 however it will be stored in the same place. We now store name resolutions
584 in a separated data structure so that each walk of a parse tree uses the
585 name resolved during the corresponding walk in the name lookup pass.
586 -The operators used to embed context and actions into states have been
587 modified. The V4 release notes contain the full details.
588 -Added zlen builtin machine to represent the zero length machine. Eventually
589 the name "null" will be phased out in favour of zlen because it is unclear
590 whether null matches the zero length string or if it does not match any
591 string at all (as does the empty builtin).
592 -Added verbose versions of action, context and priority embedding. See the V4
593 release notes for the full details. A small example:
594 machine <- all exec { foo(); } <- final eof act1
595 -Bugfix for machines with epsilon ops, but no join operations. I had
596 wrongfully assumed that because epsilon ops can only increase connectivity,
597 that no states are ever merged and therefore a call to fillInStates() is not
598 necessary. In reality, epsilon transitions within one machine can induce the
599 merging of states. In the following, state 2 follows two paths on 'i':
600 main := 'h' -> i 'i h' i: 'i';
601 -Changed the license of the guide from a custom "do not propagate modified
602 versions of this document" license to the GPL.
604 Ragel 4.1 - Jun 26, 2005
605 ========================
606 (additional details in V4 release notes)
607 -A bug in include processing was fixed. Surrounding code in an include file
608 was being passed through to the output when it should be ignored. Includes
609 are only for including portions of another machine into he current. This
610 went unnoticed because all tested includes were wrapped in #ifndef ...
611 #endif directives and so did not affect the compilation of the file making
613 -Fixes were made to Vim syntax highlighting file.
614 -Duplicate actions are now removed from action lists.
615 -The character-level negation operator ^ was added. This operator produces a
616 machine that matches single characters that are not matched by the machine
617 it is applied to. This unary prefix operator has the same precedence level
619 -The use of + to specify the a positive literal number was discontinued.
620 -The parser now assigns the subtraction operator a higher precedence than
621 the negation of literal number.
623 Ragel 4.0 - May 26, 2005
624 ========================
625 (additional details in V4 release notes)
626 -Operators now strictly embed into a machine either on a specific class of
627 characters or on EOF, but never both. This gives a cleaner association
628 between the operators and the physical state machine entitites they operate
629 on. This change is made up of several parts:
630 1. '%' operator embeds only into leaving characters.
631 2. All global and local error operators only embed on error character
632 transitions, their action will not be triggerend on EOF in non-final
634 3. EOF action embedding operators have been added for all classes of states
635 to make up for functionality removed from other operators. These are
637 4. Start transition operator '>' no longer implicitly embeds into leaving
638 transtions when start state is final.
639 -Ragel now emits warnings about the improper use of statements and values in
640 action code that is embedded as an EOF action. Warnings are emitted for fpc,
641 fc, fexec, fbuf and fblen.
642 -Added a longest match construction operator |* machine opt-action; ... *|.
643 This is for repetition where an ability to revert to a shorter, previously
644 matched item is required. This is the same behaviour as flex and re2c. The
645 longest match operator is not a pure FSM construction, it introduces
646 transitions that implicitly hold the current character or reset execution to
647 a previous location in the input. Use of this operator requires the caller
648 of the machine to occasionally hold onto data after a call to the exectute
649 routine. Use of machines generated with this operator as the input to other
650 operators may have undefined results. See examples/cppscan for an example.
651 This is very experimental code.
652 -Action ids are only assigned to actions that are referenced in the final
653 constructed machine, preventing gaps in the action id sequence. Previously
654 an action id was assigned if the action was referenced during parsing.
655 -Machine specifications now begin with %% and are followed with an optional
656 name and either a single Ragel statement or a sequence of statements
658 -Ragel no longer generates the FSM's structure or class. It is up to the user
659 to declare the structure and to give it a variable named curs of type
660 integer. If the machine uses the call stack the user must also declare a
661 array of integers named stack and an integer variable named top.
662 -In the case of Objective-C, Ragel no longer generates the interface or
663 implementation directives, allowing the user to declare additional methods.
664 -If a machine specification does not have a name then Ragel tries to find a
665 name for it by first checking if the specification is inside a struct, class
666 or interface. If it is not then it uses the name of the previous machine
667 specification. If still no name is found then this is an error.
668 -Fsm specifications now persist in memory and statements accumulate.
669 -Ragel now has an include statement for including the statements of a machine
670 spec in another file (perhaps because it is the corresponding header file).
671 The include statement can also be used to draw in the statements of another
672 fsm spec in the current file.
673 -The fstack statement is now obsolete and has been removed.
674 -A new statement, simply 'interface;', indicates that ragel should generate
675 the machine's interface. If Ragel sees the main machine it generates the
676 code sections of the machine. Previously, the header portion was generated
677 if the (now removed) struct statement was found and code was generated if
678 any machine definition was found.
679 -Fixed a bug in the resolution of fsm name references in actions. The name
680 resolution code did not recurse into inline code items with children
681 (fgoto*, fcall*, fnext*, and fexec), causing a segfault at code generation
683 -Cleaned up the code generators. FsmCodeGen was made into a virtual base
684 class allowing for the language/output-style specific classes to inherit
685 both a language specific and style-specific base class while retaining only
686 one copy of FsmCodeGen. Language specific output can now be moved into the
687 language specific code generators, requiring less duplication of code in the
688 language/output-style specific leaf classes.
689 -Fixed bugs in fcall* implementation of IpgGoto code generation.
690 -If the element type has not been defined Ragel now uses a constant version
691 of the alphtype, not the exact alphtype. In most cases the data pointer of
692 the execute routine should be const. A non-const element type can still be
693 defined with the element statement.
694 -The fc special value now uses getkey for retrieving the current char rather
695 than *_p, which is wrong if the element type is a structure.
696 -User guide converted to TeX and updated for new 4.0 syntax and semantics.
698 Ragel 3.7 - Oct 31, 2004
699 ========================
700 -Bug fix: unreferenced machine instantiations causing segfault due to name
701 tree and parse tree walk becomming out of syncronization.
702 -Rewrote representation of inline code blocks using a tree data structure.
703 This allows special keywords such as fbuf to be used as the operatands of
705 -Documentation updates.
706 -When deciding whether or not to generate machine instantiations, search the
707 entire name tree beneath the instantiation for references, not just the
709 -Removed stray ';' in keller2.rl
710 -Added fexec for restarting the machine with new buffer data (state stays the
711 same), fbuf for retrieving the the start of the buf, and fblen for
712 retrieving the orig buffer length.
713 -Implemented test/cppscan2 using fexec. This allows token emitting and restart
714 to stay inside the execute routine, instead of leaving and re-entering on
716 -Changed examples/cppscan to use fexec and thereby go much faster.
717 -Implemented flex and re2c versions of examples/cppscan. Ragel version
718 goes faster than flex version but not as fast as re2c version.
719 -Merged in Objective-C patch from Erich Ocean.
720 -Turned off syncing with stdio in C++ tests to make them go faster.
721 -Renamed C++ code generaion classes with the Cpp Prefix instead of CC to make
723 -In the finish function emit fbuf as 0 cast to a pointer to the element type
724 so it's type is not interpreted as an integer.
725 -The number -128 underflows char alphabets on some architectures. Removed
727 -Disabled the keller2 test because it causes problems on many architectures
728 due to its large size and compilation requirements.
730 Ragel 3.6 - Jul 10, 2004
731 ========================
732 -Many documentation updates.
733 -When resolving names, return a set of values so that a reference in an
734 action block that is embedded more than once won't report distinct entry
735 points that are actually the same.
736 -Implemented flat tables. Stores a linear array of indicies into the
737 transition array and only a low and high key value. Faster than binary
738 searching for keys but not usable for large alphabets.
739 -Fixed bug in deleting of transitions leftover from converstion from bst to
740 list implementation of transitions. Other code cleanup.
741 -In table based output calculate the cost of using an index. Don't use if
743 -Changed fstate() value available in init and action code to to fentry() to
744 reflect the fact that the values returned are intended to be used as targets
745 in fgoto, fnext and fcall statements. The returned state is not a unique
746 state representing the label. There can be any number of states representing
748 -Added keller2 test, C++ scanning tests and C++ scanning example.
749 -In table based output split up transitions into targets and actions. This
750 allows actions to be omitted.
751 -Broke the components of the state array into separate arrays. Requires
752 adding some fields where they could previously be omitted, however allows
753 finer grained control over the sizes of items and an overal size reduction.
754 Also means that state numbers are not an offset into the state array but
755 instead a sequence of numbers, meaning the context array does not have any
757 -Action lists and transition also have their types chosen to be the smallest
758 possible for accomodating the contained values.
759 -Changed curs state stored in fsm struct from _cs to curs. Keep fsm->curs ==
760 -1 while in machine. Added tests curs1 and curs2.
761 -Implemented the notion of context. Context can be embedded in states using
762 >:, $:, @: and %: operators. These embed a named context into start states,
763 all states, non-start/non-final and final states. If the context is declared
764 using a context statment
766 then the context can be quered for any state using fsm_name_ctx_name(state)
767 in C code and fsm_name::ctx_name(state) in C++ code. This feature makes it
768 possible to determine what "part" of the machine is currently active.
769 -Fixed crash on machine generation of graphs with no final state. If there
770 is no reference to a final state in a join operation, don't generate one.
771 -Updated Vim sytax: added labels to inline code, added various C++ keywords.
772 Don't highlight name separations as labels. Added switch labels, improved
773 alphtype, element and getkey.
774 -Fixed line info in error reporting of bad epsilon trans.
775 -Fixed fstate() for tab code gen.
776 -Removed references to malloc.h.
778 Ragel 3.5 - May 29, 2004
779 ========================
780 -When parse errors occur, the partially generated output file is deleted and
781 an non-zero exit status is returned.
782 -Updated Vim syntax file.
783 -Implemented the setting of the element type that is passed to the execute
784 routine as well as method for specifying how ragel should retrive the key
785 from the element type. This lets ragel process arbitrary structures inside
786 of which is the key that is parsed.
787 element struct Element;
788 getkey fpc->character;
789 -The current state is now implemented with an int across all machines. This
790 simplifies working with current state variables. For example this allows a
791 call stack to be implemented in user code.
792 -Implemented a method for retrieving the current state, the target state, and
794 fcurs -retrieve the current state
795 ftargs -retrieve the target state
796 fstate(name) -retrieve a named state.
797 -Implemented a mechanism for jumping to and calling to a state stored in a
799 fgoto *<expr>; -goto the state returned by the C/C++ expression.
800 fcall *<expr>; -call the state returned by the C/C++ expression.
801 -Implemented a mechanism for specifying the next state without immediately
802 transfering control there (any code following statement is executed).
803 fnext label; -set the state pointed to by label as the next state.
804 fnext *<expr>; -set the state returned by the C/C++ expression as the
806 -Action references are determined from the final machine instead of during
807 the parse tree walk. Some actions can be referenced in the parse tree but not
808 show up in the final machine. Machine analysis is now done based on this new
810 -Named state lookup now employs a breadth-first search in the lookup and
811 allows the user to fully qualify names, making it possible to specify
812 jumps/calls into parts of the machine deep in the name hierarchy. Each part
813 of name (separated by ::) employs a breadth first search from it's starting
815 -Name references now must always refer to a single state. Since references to
816 multiple states is not normally intended, it no longer happens
817 automatically. This frees the programmer from thinking about whether or not
818 a state reference is unique. It also avoids the added complexity of
819 determining when to merge the targets of multiple references. The effect of
820 references to multiple states can be explicitly created using the join
821 operator and epsilon transitions.
822 -M option was split into -S and -M. -S specifies the machine spec to generate
823 for graphviz output and dumping. -M specifies the machine definition or
825 -Machine function parameters are now prefixed with and underscore to
826 avoid the hiding of class members.
828 Ragel 3.4 - May 8, 2004
829 =======================
830 -Added the longest match kleene star operator **, which is synonymous
831 with ( ( <machine> ) $0 %1 ) *.
832 -Epsilon operators distinguish between leaving transitions (going to an
833 another expression in a comma separated list) and non-leaving transitions.
834 Leaving actions and priorities are appropriately transferred.
835 -Relative priority of following ops changed to:
839 If label is done first then the isolation of the start state in > operators
840 will cause the label to point to the old start state that doesn't have the
842 -Merged >! and >~, @! and @~, %! and %~, and $! and $~ operators to have one
843 set of global error action operators (>!, @!, %! and $!) that are invoked on
844 error by unexpected characters as well as by unexepected EOF.
845 -Added the fpc keyword for use in action code. This is a pointer to the
846 current character. *fpc == fc. If an action is invoked on EOF then fpc == 0.
847 -Added >^, @^, %^, and $^ local error operators. Global error operators (>!,
848 @!, $!, and %!) cause actions to be invoked if the final machine fails.
849 Local error actions cause actions to be invoked if if the current machine
851 -Changed error operators to mean embed global/local error actions in:
852 >! and !^ -the start state.
853 @! and @^ -states that are not the start state and are not final.
854 %! and %^ -final states.
855 $! and $^ -all states.
856 -Added >@! which is synonymous >! then @!
857 -Added >@^ which is synonymous >^ then @^
858 -Added @%! which is synonymous @! then %!
859 -Added @%^ which is synonymous >^ then @^
860 -FsmGraph representation of transition lists was changed from a mapping of
861 alphabet key -> transition objects using a BST to simply a list of
862 transition objects. Since the transitions are no longer divided by
863 single/range, the fast finding of transition objects by key is no longer
864 required functionality and can be eliminated. This new implementation uses
865 the same amount of memory however causes less allocations. It also make more
866 sense for supporting error transitions with actions. Previously an error
867 transition was represented by a null value in the BST.
868 -Regular expression ranges are checked to ensure that lower <= upper.
869 -Added printf-like example.
870 -Added atoi2, erract2, and gotcallret to the test suite.
871 -Improved build test to support make -jN and simplified the compiling and
874 Ragel 3.3 - Mar 7, 2004
875 =======================
876 -Portability bug fixes were made. Minimum and maximum integer values are
877 now taken from the system. An alignment problem on 64bit systems
880 Ragel 3.2 - Feb 28, 2004
881 ========================
882 -Added a Vim syntax file.
883 -Eliminated length var from generated execute code in favour of an end
884 pointer. Using length requires two variables be read and written. Using an
885 end pointer requires one variable read and written and one read. Results in
886 more optimizable code.
887 -Minimization is now on by default.
888 -States are ordered in output by depth first search.
889 -Bug in minimization fixed. States were not being distinguished based on
891 -Added null and empty builtin machines.
892 -Added EOF error action operators. These are >~, >@, $~, and %~. EOF error
893 operators embed actions to take if the EOF is seen and interpreted as an
894 error. The operators correspond to the following states:
896 -any state with a transition to a final state
897 -any state with a transiion out
899 -Fixed bug in generation of unreference machine vars using -M. Unreferenced
900 vars don't have a name tree built underneath when starting from
901 instantiations. Need to instead build the name tree starting at the var.
902 -Calls, returns, holds and references to fc in out action code are now
903 handled for ipgoto output.
904 -Only actions referenced by an instantiated machine expression are put into
905 the action index and written out.
906 -Added rlscan, an example that lexes Ragel input.
908 Ragel 3.1 - Feb 18, 2004
909 ========================
910 -Duplicates in OR literals are removed and no longer cause an assertion
912 -Duplicate entry points used in goto and call statements are made into
913 deterministic entry points.
914 -Base FsmGraph code moved from aapl into ragel, as an increasing amount
915 of specialization is required. Too much time was spent attempting to
916 keep it as a general purpose template.
917 -FsmGraph code de-templatized and heirarchy squashed to a single class.
918 -Single transitions taken out of FsmGraph code. In the machine construction
919 stage, transitions are now implemented only with ranges and default
920 transtions. This reduces memory consumption, simplifies code and prevents
921 covered transitions. However it requires the automated selection of single
922 transitions to keep goto-driven code lean.
923 -Machine reduction completely rewritten to be in-place. As duplicate
924 transitions and actions are found and the machine is converted to a format
925 suitable for writing as C code or as GraphViz input, the memory allocated
926 for states and transitions is reused, instead of newly allocated.
927 -New reduction code consolodates ranges, selects a default transition, and
928 selects single transitions with the goal of joining ranges that are split by
929 any number of single characters.
930 -Line directive changed from "# <num> <file>" to the more common format
931 "#line <num> <file>".
932 -Operator :! changed to @!. This should have happened in last release.
933 -Added params example.
935 Ragel 3.0 - Jan 22, 2004
936 ========================
937 -Ragel now parses the contents of struct statements and action code.
938 -The keyword fc replaces the use of *p to reference the current character in
940 -Machine instantiations other than main are allowed.
941 -Call, jump and return statements are now available in action code. This
942 facility makes it possible to jump to an error handling machine, call a
943 sub-machine for parsing a field or to follow paths through a machine as
944 determined by arbitrary C code.
945 -Added labels to the language. Labels can be used anywhere in a machine
946 expression to define an entry point. Also references to machine definitions
947 cause the implicit creation of a label.
948 -Added epsilon transitions to the language. Epsilon operators may reference
949 labels in the current name scope resolved when join operators are evaluated
950 and at the root of the expression tree of machine assignment/instantiation.
951 -Added the comma operator, which joins machines together without drawing any
952 transitions between them. This operator is useful in combination with
953 labels, the epsilon operator and user code transitions for defining machines
954 using the named state and transition list paradigm. It is also useful for
955 invoking transitions based on some analysis of the input or on the
957 -Added >!, :!, $!, %! operators for specifying actions to take should the
958 machine fail. These operators embed actions to execute if the machine
961 -any state with a transition to a final state
962 -any state with a transiion out
964 The general rule is that if an action embedding operator embeds an action
965 into a set of transitions T, then the error-counterpart with a ! embeds an
966 action into the error transition taken when any transition T is a candidate,
967 but does not match the input.
968 -The finishing augmentation operator ':' has been changed to '@'. This
969 frees the ':' symbol for machine labels and avoids hacks to the parser to
970 allow the use of ':' for both labels and finishing augmentations. The best
971 hack required that label names be distinct from machine definition names as
972 in main := word : word; This restriction is not good because labels are
973 local to the machine that they are used in whereas machine names are global
974 entities. Label name choices should not be restricted by the set of names
975 that are in use for machines.
976 -Named priority syntax now requires parenthesis surrounding the name and
977 value pair. This avoids grammar ambiguities now that the ',' operator has
978 been introduced and makes it more clear that the name and value are an
980 -Backslashes are escaped in line directive paths.
982 Ragel 2.2 - Oct 6, 2003
983 =======================
984 -Added {n}, {,n}, {n,} {n,m} repetition operators.
985 <expr> {n} -- exactly n repetitions
986 <expr> {,n} -- zero to n repetitions
987 <expr> {n,} -- n or more repetitions
988 <expr> {n,m} -- n to m repetitions
989 -Bug in binary search table in Aapl fixed. Fixes crashing on machines that
990 add to action tables that are implicitly shared among transitions.
991 -Tests using obsolete minimization algorithms are no longer built and run by
993 -Added atoi and concurrent from examples to the test suite.
995 Ragel 2.1 - Sep 22, 2003
996 ========================
997 -Bug in priority comparison code fixed. Segfaulted on some input with many
999 -Added two new examples.
1001 Ragel 2.0 - Sep 7, 2003
1002 =======================
1003 -Optional (?), One or More (+) and Kleene Star (*) operators changed from
1004 prefix to postfix. Rationale is that postfix version is far more common in
1005 regular expression implementations and will be more readily understood.
1006 -All priority values attached to transitions are now accompanied by a name.
1007 Transitions no longer have default priority values of zero assigned
1008 to them. Only transitions that have different priority values assigned
1009 to the same name influence the NFA-DFA conversion. This scheme reduces
1010 side-effects of priorities.
1011 -Removed the %! statement for unsetting pending out priorities. With
1012 named priorities, it is not necessary to clear the priorities of a
1013 machine with $0 %! because non-colliding names can be used to avoid
1015 -Removed the clear keyword, which was for removing actions from a machine.
1016 Not required functionality and it is non-intuitive to have a language
1017 feature that undoes previous definitions.
1018 -Removed the ^ modifier to repetition and concatenation operators. This
1019 undocumented feature prevented out transitions and out priorities from being
1020 transfered from final states to transitions leaving machines. Not required
1021 functionality and complicates the language unnecessarily.
1022 -Keyword 'func' changed to 'action' as a part of the phasing out of the term
1023 'function' in favour of 'action'. Rationale is that the term 'function'
1024 implies that the code is called like a C function, which is not necessarily
1025 the case. The term 'action' is far more common in state machine compiler
1027 -Added the instantiation statement, which looks like a standard variable
1028 assignment except := is used instead of =. Instantiations go into the
1029 same graph dictionary as definitions. In the the future, instantiations
1030 will be used as the target for gotos and calls in action code.
1031 -The main graph should now be explicitly instantiated. If it is not,
1032 a warning is issued.
1033 -Or literal basic machines ([] outside of regular expressions) now support
1034 negation and ranges.
1035 -C and C++ interfaces lowercased. In the C interface an underscore now
1036 separates the fsm machine and the function name. Rationale is that lowercased
1037 library and generated routines are more common.
1039 int fsm_init( struct clang *fsm );
1040 int fsm_execute( struct clang *fsm, char *data, int dlen );
1041 int fsm_finish( struct clang *fsm );
1044 int fsm::execute( char *data, int dlen );
1046 -Init, execute and finish all return -1 if the machine is in the error state
1047 and can never accept, 0 if the machine is in a non-accepting state that has a
1048 path to a final state and 1 if the machine is in an accepting state.
1049 -Accept routine eliminated. Determining whether or not the machine accepts is
1050 done by examining the return value of the finish routine.
1051 -In C output, fsm structure is no longer a typedef, so referencing requires
1052 the struct keyword. This is to stay in line with C language conventions.
1053 -In C++ output, constructor is no longer written by ragel. As a consequence,
1054 init routine is not called automatically. Allows constructor to be supplied
1055 by user as well as the return value of init to be examined without calling it
1057 -Static start state and private structures are taken out of C++ classes.
1059 Ragel 1.5.4 - Jul 14, 2003
1060 ==========================
1061 -Workaround for building with bison 1.875, which produces an
1062 optimization that doesn't build with newer version gcc.
1064 Ragel 1.5.3 - Jul 10, 2003
1065 ==========================
1066 -Fixed building with versions of flex that recognize YY_NO_UNPUT.
1067 -Fixed version numbers in ragel.spec file.
1069 Ragel 1.5.2 - Jul 7, 2003
1070 =========================
1071 -Transition actions and out actions displayed in the graphviz output.
1072 -Transitions on negative numbers handled in graphviz output.
1073 -Warning generated when using bison 1.875 now squashed.
1075 Ragel 1.5.1 - Jun 21, 2003
1076 ==========================
1077 -Bugs fixed: Don't delete the output objects when writing to standard out.
1078 Copy mem into parser buffer with memcpy, not strcpy. Fixes buffer mem errror.
1079 -Fixes for compiling with Sun WorkShop 6 compilers.
1081 Ragel 1.5.0 - Jun 10, 2003
1082 ==========================
1083 -Line directives written to the output so that errors in the action code
1084 are properly reported in the ragel input file.
1085 -Simple graphviz dot file output format is supported. Shows states and
1086 transitions. Does not yet show actions.
1087 -Options -p and -f dropped in favour of -d output format.
1088 -Added option -M for specifying the machine to dump with -d or the graph to
1090 -Error recovery implemented.
1091 -Proper line and column number tracking implemented in the scanner.
1092 -All action/function code is now embedded in the main Execute routine. Avoids
1093 duplication of action code in the Finish routine and the need to call
1094 ExecFuncs which resulted in huge code bloat. Will also allow actions to
1095 modify cs when fsm goto, call and return is supported in action code.
1096 -Fsm spec can have no statements, nothing will be generated.
1097 -Bug fix: Don't accept ] as the opening of a .-. range a reg exp.
1098 -Regular expression or set ranges (ie /[0-9]/) are now handled by the parser
1099 and consequently must be well-formed. The following now generates a parser
1100 error: /[+-]/ and must be rewritten as /[+\-]/. Also fixes a bug whereby ]
1101 might be accepted as the opening of a .-. range causing /[0-9]-[0-9]/ to
1103 -\v, \f, and \r are now treated as whitespace in an fsm spec.
1105 Ragel 1.4.1 - Nov 19, 2002
1106 ==========================
1107 -Compile fixes. The last release (integer alphabets) was so exciting
1108 that usual portability checks got bypassed.
1110 Ragel 1.4.0 - Nov 19, 2002
1111 ==========================
1112 -Arbitrary integer alphabets are now fully supported! A new language
1114 'alphtype <type>' added for specifying the type of the alphabet. Default
1115 is 'char'. Possible alphabet types are:
1116 char, unsigned char, short, unsigned short, int, unsigned int
1117 -Literal machines specified in decimal format can now be negative when the
1118 alphabet is a signed type.
1119 -Literal machines (strings, decimal and hex) have their values checked for
1120 overflow/underflow against the size of the alphabet type.
1121 -Table driven and goto driven output redesigned to support ranges. Table
1122 driven uses a binary search for locating single characters and ranges. Goto
1123 driven uses a switch statement for single characters and nested if blocks for
1125 -Switch driven output removed due to a lack of consistent advantages. Most of
1126 the time the switch driven FSM is of no use because the goto FSM makes
1127 smaller and faster code. Under certain circumstances it can produce smaller
1128 code than a goto driven fsm and be almost as fast, but some sporadic case
1129 does not warrant maintaining it.
1130 -Many warnings changed to errors.
1131 -Added option -p for printing the final fsm before minimization. This lets
1132 priorities be seen. Priorties are all reset to 0 before minimization. The
1133 exiting option -f prints the final fsm after minimization.
1134 -Fixed a bug in the clang test and example that resulted in redundant actions
1137 Ragel 1.3.4 - Nov 6, 2002
1138 =========================
1139 -Fixes to Chapter 1 of the guide.
1140 -Brought back the examples and made them current.
1141 -MSVC is no longer supported for compiling windows binaries because its
1142 support for the C++ standard is frustratingly inadequate, it will cost money
1143 to upgrade if it ever gets better, and MinGW is a much better alternative.
1144 -The build system now supports the --host= option for building ragel
1145 for another system (used for cross compiling a windows binary with MinGW).
1146 -Various design changes and fixes towards the goal of arbitrary integer
1147 alphabets and the handling of larger state machines were made.
1148 -The new shared vector class is now used for action lists in transitions and
1149 states to reduce memory allocations.
1150 -An avl tree is now used for the reduction of transitions and functions of an
1151 fsm graph before making the final machine. The tree allows better scalability
1152 and performance by not requiring consecutively larger heap allocations.
1153 -Final stages in the separation of fsm graph code from action embedding and
1154 priority assignment is complete. Makes the base graph leaner and easier to reuse
1155 in other projects (like Keller).
1157 Ragel 1.3.3 - Oct 22, 2002
1158 ==========================
1159 -More diagrams were added to section 1.7.1 of the user guide.
1160 -FSM Graph code was reworked to spearate the regex/nfa/minimizaion graph
1161 algorithms from the manipulation of state and transition properties.
1162 -An rpm spec file from Cris Bailiff was added. This allows an rpm for ragel
1163 to be built with the command 'rpm -ta ragel-x.x.x.tar.gz'
1164 -Fixes to the build system and corresponding doc updates in the README.
1165 -Removed autil and included the one needed source file directly in the top
1166 level ragel directory.
1167 -Fixed a bug that nullified the 20 times speedup in large compilations
1168 claimed by the last version.
1169 -Removed awk from the doc build (it was added with the last release -- though
1170 not mentioned in the changelog).
1171 -Install of man page was moved to the doc dir. The install also installs the
1172 user guide to $(PREFIX)/share/doc/ragel/
1174 Ragel 1.3.2 - Oct 16, 2002
1175 ==========================
1176 -Added option -v (or --version) to show version information.
1177 -The subtract operator no longer removes transition data from the machine
1178 being subtracted. This is left up to the user for the purpose of making it
1179 possible to transfer transitions using subtract and also for speeding up the
1180 subtract routine. Note that it is possible to explicitly clear transition
1181 data before a doing a subtract.
1182 -Rather severe typo bug fixed. Bug was related to transitions with higher
1183 priorities taking precedence. A wrong ptr was being returned. It appears to
1184 have worked most of the time becuase the old ptr was deleted and the new one
1185 allocated immediatly after so the old ptr often pointed to the same space.
1187 -Bug in the removing of dead end paths was fixed. If the start state
1188 has in transitions then those paths were not followed when finding states to
1189 keep. Would result in non-dead end states being removed from the graph.
1190 -In lists and in ranges are no longer maintained as a bst with the key as the
1191 alphabet character and the value as a list of transitions coming in on that
1192 char. There is one list for each of inList, inRange and inDefault. Now that
1193 the required functionality of the graph is well known it is safe to remove
1194 these lists to gain in speed and footprint. They shouldn't be needed.
1195 -IsolateStartState() runs on modification of start data only if the start
1196 state is not already isolated, which is now possible with the new in list
1198 -Concat, Or and Star operators now use an approximation to
1199 removeUnreachableStates that does not require a traversal of the entire
1200 graph. This combined with an 'on-the-fly' management of final bits and final
1201 state status results is a dramatic speed increase when compiling machines
1202 that use those operators heavily. The strings2 test goes 20 times faster.
1203 -Before the final minimization, after all fsm operations are complete,
1204 priority data is reset which enables better minimization in cases where
1205 priorities would otherwise separate similar states.
1207 Ragel 1.3.1 - Oct 2, 2002
1208 =========================
1209 -Range transitions are now used to implement machines made with /[a-z]/ and
1210 the .. operator as well as most of the builtin machines. The ranges are not
1211 yet reflected in the output code, they are expanded as if they came from the
1212 regular single transitions. This is one step closer to arbitrary integer
1214 -The builtin machine 'any' was added. It is equiv to the builtin extend,
1215 matching any characters.
1216 -The builtin machine 'cntrl' now includes newline.
1217 -The builtin machine 'space' now includes newline.
1218 -The builtin machine 'ascii' is now the range 0-127, not all characters.
1219 -A man page was written.
1220 -A proper user guide was started. Chapter 1: Specifying Ragel Programs
1221 was written. It even has some diagrams :)
1223 Ragel 1.3.0 - Sep 4, 2002
1224 =========================
1225 -NULL keyword no longer used in table output.
1226 -Though not yet in use, underlying graph structure changed to support range
1227 transitions. As a result, most of the code that walks transition lists is now
1228 implemented with an iterator that hides the complexity of the transition
1229 lists and ranges. Range transitions will be used to implement /[a-z]/ style
1230 machines and machines made with the .. operator. Previously a single
1231 transition would be used for each char in the range, which is very costly.
1232 Ranges eliminate much of the space complexity and allow for the .. operator
1233 to be used with very large (integer) alphabets.
1234 -New minimization similar to Hopcroft's alg. It does not require n^2 space and
1235 runs close to O(n*log(n)) (an exact analysis of the alg is very hard). It is
1236 much better than the stable and approx minimization and obsoletes them both.
1237 An exact implementation of Hopcroft's alg is desirable but not possible
1238 because the ragel implementation does not assume a finite alphabet, which
1239 Hopcroft's requires. Ragel will support arbitrary integer alphabets which
1240 must be treated as an infinite set for implementation considerations.
1241 -New option -m using above described minimization to replace all previous
1242 minimization options. Old options sill work but are obsolete and not
1244 -Bug fixed in goto style output. The error exit set the current state to 0,
1245 which is actually a valid state. If the machine was entered again it would go
1246 into the first state, very wrong. If the first state happened to be final then
1247 an immediate finish would accept when in fact it should fail.
1248 -Slightly better fsm minimization now capable due to clearing of the
1249 transition ordering numbers just prior to minimization.
1251 Ragel 1.2.2 - May 25, 2002
1252 ==========================
1253 -Configuration option --prefix now works when installing.
1254 -cc file extension changed to cpp for better portability.
1255 -Unlink of output file upon error no longer happens, removes dependency on
1256 unlink system command.
1257 -All multiline strings removed: not standard c++.
1258 -Awk build dependency removed.
1259 -MSVC 6.0 added to the list of supported compilers (with some tweaking of
1260 bison and flex output).
1262 Ragel 1.2.1 - May 13, 2002
1263 ==========================
1264 -Automatic dependencies were fixed, they were not working correctly.
1265 -Updated AUTHORS file to reflect contributors.
1266 -Code is more C++ standards compliant: compiles with g++ 3.0
1267 -Fixed bugs that only showed up in g++ 3.0
1268 -Latest (unreleased) Aapl.
1269 -Configuration script bails out if bison++ is installed. Ragel will not
1270 compile with bison++ because it is coded in c++ and bison++ automatically
1271 generates a c++ parser. Ragel uses a c-style bison parser.
1273 Ragel 1.2.0 - May 3, 2002
1274 =========================
1275 -Underlying graph structure now supports default transitions. The result is
1276 that a transition does not need to be made for each char of the alphabet
1277 when making 'extend' or '/./' machines. Ragel compiles machines that
1278 use the aforementioned primitives WAY faster.
1279 -The ugly hacks needed to pick default transitions now go away due to
1280 the graph supporting default transitions directly.
1281 -If -e is given, but minimization is not turned on, print a warning.
1282 -Makefiles use automatic dependencies.
1284 Ragel 1.1.0 - Apr 15, 2002
1285 ==========================
1286 -Added goto fsm: much faster than any other fsm style.
1287 -Default operator (if two machines are side by side with no operator
1288 between them) is concatenation. First showed up in 1.0.4.
1289 -The fsm machine no longer auotmatically builds the flat table for
1290 transition indicies. Instead it keeps the key,ptr pair. In tabcodegen
1291 the flat table is produced. This way very large alphabets with sparse
1292 transitions will not consume large amounts of mem. This is also in prep
1293 for fsm graph getting a default transition.
1294 -Generated code contains a statement explicitly stating that ragel fsms
1295 are NOT covered by the GPL. Technically, Ragel copies part of itself
1296 to the output to make the generic fsm execution routine (for table driven
1297 fsms only) and so the output could be considered under the GPL. But this
1298 code is very trivial and could easlily be rewritten. The actual fsm data
1299 is subject to the copyright of the source. To promote the use of Ragel,
1300 a special exception is made for the part of the output copied from Ragel:
1301 it may be used without restriction.
1302 -Much more elegant code generation scheme is employed. Code generation
1303 class members need only put the 'codegen' keyword after their 'void' type
1304 in order to be automatically registerd to handle macros of the same name.
1305 An awk script recognises this keyword and generates an appropriate driver.
1306 -Ragel gets a test suite.
1307 -Postfunc and prefunc go away because they are not supported by non
1308 loop-driven fsms (goto, switch) and present duplicate functionality.
1309 Universal funcs can be implemented by using $ operator.
1310 -Automatic dependencies used in build system, no more make depend target.
1311 -Code generation section in docs.
1312 -Uses the latests aapl.
1314 Ragel 1.0.5 - Mar 3, 2002
1315 =========================
1316 -Bugfix in SetErrorState that caused an assertion failure when compiling
1317 simple machines that did not have full transition tables (and thus did
1318 not show up on any example machines). Assertion failure did not occur
1319 when using the switch statement code as ragel does not call SetErrorState
1321 -Fixed some missing includes, now compiles on redhat.
1322 -Moved the FsmMachTrans Compare class out of FsmMachTrans. Some compilers
1323 don't deal with nested classes in templates too well.
1324 -Removed old unused BASEREF in fsmgraph and ragel now compiles using
1325 egcs-2.91.66 and presumably SUNWspro. The baseref is no longer needed
1326 because states do not support being elements in multiple lists. I would
1327 rather be able to support more compilers than have this feature.
1328 -Started a README with compilation notes. Started an AUTHORS file.
1329 -Started the user documentation. Describes basic machines and operators.
1331 Ragel 1.0.4 - Mar 1, 2002
1332 =========================
1333 -Ported to the version of Aapl just after 2.2.0 release. See
1334 http://www.ragel.ca/aapl/ for details on aapl.
1335 -Fixed a bug in the clang example: the newline machine was not stared.
1336 -Added explanations to the clang and mailbox examples. This should
1337 help people that want to learn the lanuage as the manual is far from
1340 Ragel 1.0.3 - Feb 2, 2002
1341 =========================
1342 -Added aapl to the ragel tree. No longer requires you to download
1343 and build aapl separately. Should avoid discouraging impatient users
1344 from compiling ragel.
1345 -Added the examples to the ragel tree.
1346 -Added configure script checks for bison and flex.
1347 -Fixed makefile so as not to die with newer versions of bison that
1348 write the header of the parser to a .hh file.
1349 -Started ChangeLog file.
1351 Ragel 1.0.2 - Jan 30, 2002
1352 ==========================
1353 -Bug fix in calculating highIndex for table based code. Was using
1354 the length of out tranisition table rather than the value at the
1356 -If high/low index are at the limits, output a define in their place,
1357 not the high/low values themselves so as not to cause compiler warnings.
1358 -If the resulting machines don't have any indicies or functions, then
1359 omit the empty unrefereced static arrays so as not to cause compiler
1360 warnings about unused static vars.
1361 -Fixed variable sized indicies support. The header cannot have any
1362 reference to INDEX_TYPE as that info is not known at the time the header
1363 data is written. Forces us to use a void * for pointers to indicies. In
1364 the c++ versions we are forced to make much of the data non-member
1365 static data in the code portion for the same reason.
1367 Ragel 1.0.1 - Jan 28, 2002
1368 ==========================
1369 -Exe name change from reglang to ragel.
1370 -Added ftabcodegen output code style which uses a table for states and
1371 transitions but uses a switch statement for the function execution.
1372 -Reformatted options in usage dump to look better.
1373 -Support escape sequences in [] sections of regular expressions.
1375 Ragel 1.0 - Jan 25, 2002
1376 ========================