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1 | %%% -*-latex-*- |
2 | %%% | |
3 | %%% Description of the parsing machinery | |
4 | %%% | |
5 | %%% (c) 2015 Straylight/Edgeware | |
6 | %%% | |
7 | ||
8 | %%%----- Licensing notice --------------------------------------------------- | |
9 | %%% | |
e0808c47 | 10 | %%% This file is part of the Sensible Object Design, an object system for C. |
1f7d590d MW |
11 | %%% |
12 | %%% SOD is free software; you can redistribute it and/or modify | |
13 | %%% it under the terms of the GNU General Public License as published by | |
14 | %%% the Free Software Foundation; either version 2 of the License, or | |
15 | %%% (at your option) any later version. | |
16 | %%% | |
17 | %%% SOD is distributed in the hope that it will be useful, | |
18 | %%% but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | %%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | %%% GNU General Public License for more details. | |
21 | %%% | |
22 | %%% You should have received a copy of the GNU General Public License | |
23 | %%% along with SOD; if not, write to the Free Software Foundation, | |
24 | %%% Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | ||
26 | \chapter{Parsing} \label{ch:parsing} | |
27 | ||
28 | %%%-------------------------------------------------------------------------- | |
29 | \section{The parser protocol} \label{sec:parsing.proto} | |
30 | ||
31 | For the purpose of Sod's parsing library, \emph{parsing} is the process of | |
32 | reading a sequence of input items, in order, and computing an output value. | |
33 | ||
34 | A \emph{parser} is an expression which consumes zero or more input items and | |
35 | returns three values: a \emph{result}, a \emph{success flag}, and a | |
36 | \emph{consumed flag}. The two flags are (generalized) booleans. If the | |
37 | success flag is non-nil, then the parser is said to have \emph{succeeded}, | |
38 | and the result is the parser's output. If the success flag is nil then the | |
39 | parser is said to have \emph{failed}, and the result is a list of | |
40 | \emph{indicators}. Finally, the consumed flag is non-nil if the parser | |
41 | consumed any input items. | |
42 | ||
fcb6c0fb MW |
43 | \begin{describe}{fun}{combine-parser-failures @<failures> @> @<list>} |
44 | \end{describe} | |
45 | ||
da901cf2 MW |
46 | \begin{describe}{fun}{parse-empty \&optional @<value> @> @<function>} |
47 | \end{describe} | |
48 | ||
49 | \begin{describe}{fun} | |
50 | {parse-fail @<indicator> \&optional @<consumedp> @> @<function>} | |
51 | \end{describe} | |
52 | ||
1f7d590d | 53 | %%%-------------------------------------------------------------------------- |
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54 | \section{File locations} \label{sec:parsing.floc} |
55 | ||
56 | \begin{describe}{cls}{file-location} | |
57 | \end{describe} | |
58 | ||
59 | \begin{describe}{fun}{file-location-p @<object> @> @<generalized-boolean>} | |
60 | \end{describe} | |
61 | ||
62 | \begin{describe}{fun} | |
63 | {make-file-location @<filename> \&optional @<line> @<column> | |
64 | @> @<file-location>} | |
65 | \end{describe} | |
66 | ||
67 | \begin{describe*} | |
68 | {\dhead{fun}{file-location-filename @<floc> @> @<string-or-nil>} | |
69 | \dhead{fun}{file-location-line @<floc> @> @<fixnum-or-nil>} | |
70 | \dhead{fun}{file-location-column @<floc> @> @<fixnum-or-nil>}} | |
71 | \end{describe*} | |
72 | ||
73 | \begin{describe}{gf}{file-location @<object> @> @<floc>} | |
74 | \begin{describe}{meth}{file-location (@<floc> file-location) @> @<floc>} | |
75 | \end{describe} | |
76 | \begin{describe}{meth}{file-location (@<stream> stream) @> @<floc>} | |
77 | \end{describe} | |
78 | \begin{describe}{meth}{file-location (@<any> t) @> @<floc>} | |
79 | \end{describe} | |
80 | \end{describe} | |
81 | ||
82 | \begin{describe}{cls}{condition-with-location (condition) \&key :location} | |
83 | \end{describe} | |
84 | ||
85 | \begin{describe}{meth} | |
86 | {file-location (@<condition> condition-with-location) @> @<floc>} | |
87 | \end{describe} | |
88 | ||
89 | \begin{describe*} | |
90 | {\quad\=\quad\=\kill | |
91 | \dhead{cls} | |
020b9e2b | 92 | {error-with-location (condition-with-location error) \\ \> |
acaf88ad | 93 | \&key :location} |
fcb6c0fb | 94 | \dhead{cls} |
acaf88ad MW |
95 | {warning-with-location (condition-with-location warning) \\ \> |
96 | \&key :location} | |
db6c3279 MW |
97 | \dhead{cls} |
98 | {information-with-location (condition-with-location information) \\ \> | |
99 | \&key :location} | |
fcb6c0fb | 100 | \dhead{cls} |
acaf88ad | 101 | {enclosing-error-with-location |
020b9e2b | 102 | (enclosing-error-with-location error) \\ \> |
acaf88ad MW |
103 | \&key :condition :location} |
104 | \dhead{cls} | |
105 | {enclosing-warning-with-location | |
020b9e2b | 106 | (enclosing-condition-with-location warning) \\ \> |
acaf88ad | 107 | \&key :condition :location} |
db6c3279 MW |
108 | \dhead{cls} |
109 | {enclosing-information-with-location | |
110 | (enclosing-condition-with-location information) \\ \> | |
111 | \&key :condition :location} | |
acaf88ad MW |
112 | \dhead{cls} |
113 | {simple-condition-with-location | |
020b9e2b | 114 | (condition-with-location simple-condition) \\ \> |
acaf88ad MW |
115 | \&key :format-control :format-arguments :location} |
116 | \dhead{cls} | |
117 | {simple-error-with-location | |
020b9e2b | 118 | (error-with-location simple-error) \\ \> |
acaf88ad MW |
119 | \&key :format-control :format-arguments :location} |
120 | \dhead{cls} | |
121 | {simple-warning-with-location | |
020b9e2b | 122 | (warning-with-location simple-warning) \\ \> |
db6c3279 MW |
123 | \&key :format-control :format-arguments :location} |
124 | \dhead{cls} | |
125 | {simple-information-with-location | |
126 | (information-with-location simple-information) \\ \> | |
acaf88ad | 127 | \&key :format-control :format-arguments :location}} |
fcb6c0fb MW |
128 | \end{describe*} |
129 | ||
388ab382 MW |
130 | \begin{describe}{gf} |
131 | {enclosing-condition-with-location-type @<condition> @> @<symbol>} | |
132 | \end{describe} | |
133 | ||
fcb6c0fb MW |
134 | \begin{describe}{fun} |
135 | {make-condition-with-location @<default-type> @<floc> | |
136 | @<datum> \&rest @<arguments> | |
137 | \nlret @<condition-with-location>} | |
138 | \end{describe} | |
139 | ||
140 | \begin{describe*} | |
141 | {\dhead{fun}{error-with-location @<floc> @<datum> \&rest @<arguments>} | |
142 | \dhead{fun}{cerror-with-location @<floc> @<continue-string> | |
143 | @<datum> \&rest @<arguments>} | |
144 | \dhead{fun}{cerror*-with-location @<floc> @<datum> \&rest @<arguments>} | |
145 | \dhead{fun}{warn-with-location @<floc> @<datum> \&rest @<arguments>}} | |
146 | \end{describe*} | |
147 | ||
40d95de7 MW |
148 | \begin{describe*} |
149 | {\dhead{cls}{parser-error (error) \\ \ind | |
150 | \&key :expected :found \-} | |
151 | \dhead{gf}{parser-error-expected @<condition> @> @<list>} | |
152 | \dhead{gf}{parser-error-found @<condition> @> @<value>}} | |
153 | \end{describe*} | |
154 | ||
155 | \begin{describe}{fun} | |
156 | {report-parser-error @<error> @<stream> @<show-expected> @<show-found>} | |
157 | \end{describe} | |
158 | ||
159 | \begin{describe*} | |
160 | {\quad\=\kill | |
161 | \dhead{cls}{base-lexer-error (error-with-location) \&key :location} | |
162 | \dhead{cls}{simple-lexer-error | |
163 | (base-lexer-error simple-error-with-location) \\\> | |
164 | \&key :format-control :format-arguments :location} | |
165 | \dhead{cls}{base-syntax-error (error-with-location) \&key :location} | |
166 | \dhead{cls}{simple-syntax-error | |
167 | (base-syntax-error simple-error-with-location) \\\> | |
168 | \&key :format-control :format-arguments :location}} | |
169 | \end{describe*} | |
170 | ||
fcb6c0fb | 171 | \begin{describe}{mac} |
cac85e0b MW |
172 | {with-default-error-location (@<floc>) @<declaration>^* @<form>^* |
173 | @> @<value>^*} | |
fcb6c0fb MW |
174 | \end{describe} |
175 | ||
40d95de7 MW |
176 | \begin{describe}{gf}{classify-condition @<condition> @> @<string>} |
177 | \begin{describe*} | |
178 | {\dhead{meth}{classify-condition (@<condition> error) @> @<string>} | |
179 | \dhead{meth}{classify-condition (@<condition> warning) @> @<string>} | |
180 | \dhead{meth}{classify-condition (@<condition> information) | |
181 | @> @<string>} | |
182 | \dhead{meth}{classify-condition (@<condition> base-lexer-error) | |
183 | @> @<string>} | |
184 | \dhead{meth}{classify-condition (@<condition> base-syntax-error) | |
185 | @> @<string>}} | |
186 | \end{describe*} | |
187 | \end{describe} | |
188 | ||
fcb6c0fb | 189 | \begin{describe}{mac} |
cac85e0b | 190 | {count-and-report-errors () @<declaration>^* @<form>^* |
fcb6c0fb MW |
191 | @> @<value> @<n-errors> @<n-warnings>} |
192 | \end{describe} | |
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193 | |
194 | %%%-------------------------------------------------------------------------- | |
195 | \section{Scanners} \label{sec:parsing.scanner} | |
196 | ||
197 | A \emph{scanner} is an object which keeps track of a parser's progress as it | |
198 | works through its input. There's no common base class for scanners: a | |
199 | scanner is simply any object which implements the scanner protocol described | |
200 | here. | |
201 | ||
202 | A scanner maintains a sequence of items to read. It can step forwards | |
203 | through the items, one at a time, until it reaches the end (if, indeed, the | |
204 | sequence is finite, which it needn't be). Until that point, there is a | |
205 | current item, though there's no protocol for accessing it at this level | |
206 | because the nature of the items is left unspecified. | |
207 | ||
208 | Some scanners support an additional \emph{place-capture} protocol which | |
209 | allows rewinding the scanner to an earlier point in the input so that it can | |
210 | be scanned again. | |
211 | ||
212 | \subsection{Basic scanner protocol} \label{sec:parsing.scanner.basic} | |
213 | ||
214 | The basic protocol supports stepping the scanner forward through its input | |
215 | sequence, and detecting the end of the sequence. | |
216 | ||
217 | \begin{describe}{gf}{scanner-step @<scanner>} | |
218 | Advance the @<scanner> to the next item, which becomes current. | |
219 | ||
220 | It is an error to step the scanner if the scanner is at end-of-file. | |
221 | \end{describe} | |
222 | ||
223 | \begin{describe}{gf}{scanner-at-eof-p @<scanner> @> @<generalized-boolean>} | |
224 | Return non-nil if the scanner is at end-of-file, i.e., there are no more | |
225 | items to read. | |
226 | ||
227 | If nil is returned, there is a current item, and it is safe to step the | |
228 | scanner again; otherwise, it is an error to query the current item or to | |
229 | step the scanner. | |
230 | \end{describe} | |
231 | ||
232 | \subsection{Place-capture scanner protocol} \label{sec:parsing.scanner.place} | |
233 | ||
234 | The place-capture protocol allows rewinding to an earlier point in the | |
235 | sequence. Not all scanners support the place-capture protocol. | |
236 | ||
237 | To rewind a scanner to a particular point, that point must be \emph{captured} | |
238 | as a \emph{place} when it's current -- so you must know in advance that this | |
239 | is an interesting place that's worth capturing. The type of place returned | |
240 | depends on the type of scanner. Given a captured place, the scanner can be | |
241 | rewound to the position held in it. | |
242 | ||
243 | Depending on how the scanner works, holding onto a captured place might | |
244 | consume a lot of memory or case poor performance. For example, if the | |
245 | scanner is reading from an input stream, having a captured place means that | |
246 | data from that point on must be buffered in case the program needs to rewind | |
247 | the scanner and read that data again. Therefore it's possible to | |
248 | \emph{release} a place when it turns out not to be needed any more. | |
249 | ||
250 | \begin{describe}{gf}{scanner-capture-place @<scanner> @> @<place>} | |
251 | Capture the @<scanner>'s current position as a place, and return the place. | |
252 | \end{describe} | |
253 | ||
254 | \begin{describe}{gf}{scanner-restore-place @<scanner> @<place>} | |
255 | Rewind the @<scanner> to the state it was in when @<place> was captured. | |
256 | In particular, the item that was current when the @<place> was captured | |
257 | becomes current again. | |
258 | ||
259 | It is an error to restore a @<place> that has been released, or if the | |
260 | @<place> wasn't captured from the @<scanner>. | |
261 | \end{describe} | |
262 | ||
263 | \begin{describe}{gf}{scanner-release-place @<scanner> @<place>} | |
264 | Release the @<place>, to avoid having to maintaining the ability to restore | |
265 | it after it's not needed any more.. | |
266 | ||
267 | It is an error if the @<place> wasn't captured from the @<scanner>. | |
268 | \end{describe} | |
269 | ||
270 | \begin{describe}{mac} | |
cac85e0b MW |
271 | {with-scanner-place (@<place> @<scanner>) @<declarations>^* @<form>^* |
272 | @> @<value>^*} | |
cd35a54e MW |
273 | Capture the @<scanner>'s current position as a place, evaluate the @<form>s |
274 | as an implicit progn with the variable @<place> bound to the captured | |
275 | place. When control leaves the @<form>s, the place is released. The | |
276 | return values are the values of the final @<form>. | |
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277 | \end{describe} |
278 | ||
279 | \subsection{Scanner file-location protocol} \label{sec:parsing.scanner.floc} | |
280 | ||
fcb6c0fb MW |
281 | Some scanners participate in the file-location protocol |
282 | (\xref{sec:parsing.floc}). They implement a method on @|file-location| which | |
283 | collects the necessary information using scanner-specific functions described | |
284 | here. | |
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285 | |
286 | \begin{describe}{fun}{scanner-file-location @<scanner> @> @<file-location>} | |
287 | Return a @|file-location| object describing the current position of the | |
288 | @<scanner>. | |
289 | ||
290 | This calls the @|scanner-filename|, @|scanner-line| and @|scanner-column| | |
291 | generic functions on the scanner, and uses these to fill in an appropriate | |
292 | @|file-location|. | |
293 | ||
294 | Since there are default methods on these generic functions, it is not an | |
295 | error to call @|scanner-file-location| on any kind of value, but it might | |
296 | not be very useful. This function exists to do the work of appropriately | |
297 | specialized methods on @|file-location|. | |
298 | \end{describe} | |
299 | ||
fcb6c0fb MW |
300 | \begin{describe*} |
301 | {\dhead{gf}{scanner-filename @<scanner> @> @<string>} | |
302 | \dhead{gf}{scanner-line @<scanner> @> @<integer>} | |
303 | \dhead{gf}{scanner-column @<scanner> @> @<integer>}} | |
304 | Return the filename, line and column components of the @<scanner>'s current | |
305 | position, for use in assembling a @<file-location>: see the | |
306 | @|scanner-file-location| function. | |
1f7d590d | 307 | |
fcb6c0fb MW |
308 | There are default methods on all three generic functions which simply |
309 | return nil. | |
310 | \end{describe*} | |
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311 | |
312 | \subsection{Character scanners} \label{sec:parsing.scanner.char} | |
313 | ||
314 | Character scanners are scanners which read sequences of characters. | |
315 | ||
316 | \begin{describe}{cls}{character-scanner () \&key} | |
317 | Base class for character scanners. This provides some very basic | |
318 | functionality. | |
319 | ||
320 | Not all character scanners are subclasses of @|character-scanner|. | |
321 | \end{describe} | |
322 | ||
323 | \begin{describe}{gf}{scanner-current-char @<scanner> @> @<character>} | |
324 | Returns the current character. | |
325 | \end{describe} | |
326 | ||
327 | \begin{describe}{gf}{scanner-unread @<scanner> @<character>} | |
328 | Rewind the @<scanner> by one step. The @<chararacter> must be the previous | |
329 | current character, and becomes the current character again. It is an error | |
330 | if: the @<scanner> has reached end-of-file; the @<scanner> is never been | |
331 | stepped; or @<character> was not the previous current character. | |
332 | \end{describe} | |
333 | ||
334 | \begin{describe}{gf} | |
335 | {scanner-interval @<scanner> @<place-a> \&optional @<place-b> | |
336 | @> @<string>} | |
337 | Return the characters in the @<scanner>'s input from @<place-a> up to (but | |
338 | not including) @<place-b>. | |
339 | ||
340 | The characters are returned as a string. If @<place-b> is omitted, return | |
341 | the characters up to (but not including) the current position. It is an | |
342 | error if @<place-b> precedes @<place-a> or they are from different | |
343 | scanners. | |
344 | ||
345 | This function is a character-scanner-specific extension to the | |
346 | place-capture protocol; not all character scanners implement the | |
347 | place-capture protocol, and some that do may not implement this function. | |
348 | \end{describe} | |
349 | ||
350 | \subsubsection{Stream access to character scanners} | |
351 | Sometimes it can be useful to apply the standard Lisp character input | |
352 | operations to the sequence of characters held by a character scanner. | |
353 | ||
354 | \begin{describe}{gf}{make-scanner-stream @<scanner> @> @<stream>} | |
355 | Returns a fresh input @|stream| object which fetches input characters from | |
356 | the character scanner object @<scanner>. Reading characters from the | |
357 | stream steps the scanner. The stream will reach end-of-file when the | |
358 | scanner reports end-of-file. If the scanner implements the file-location | |
359 | protocol then reading from the stream will change the file location in an | |
360 | appropriate manner. | |
361 | ||
362 | This is mostly useful for applying standard Lisp stream functions, most | |
363 | particularly the @|read| function, in the middle of a parsing operation. | |
364 | \end{describe} | |
365 | ||
366 | \begin{describe}{cls}{character-scanner-stream (stream) \&key :scanner} | |
367 | A Common Lisp input @|stream| object which works using the character | |
368 | scanner protocol. Any @<scanner> which implements the base scanner and | |
369 | character scanner protocols is suitable. See @|make-scanner-stream|. | |
370 | \end{describe} | |
371 | ||
372 | \subsection{String scanners} \label{sec:parsing.scanner.string} | |
373 | ||
374 | A \emph{string scanner} is a simple kind of character scanner which reads | |
375 | input from a string object. String scanners implement the character scanner | |
376 | and place-capture protocols. | |
377 | ||
378 | \begin{describe}{cls}{string-scanner} | |
379 | The class of string scanners. The @|string-scanner| class is not a | |
380 | subclass of @|character-scanner|. | |
381 | \end{describe} | |
382 | ||
383 | \begin{describe}{fun}{string-scanner-p @<value> @> @<generalized-boolean>} | |
384 | Return non-nil if @<value> is a @|string-scanner| object; otherwise return | |
385 | nil. | |
386 | \end{describe} | |
387 | ||
388 | \begin{describe}{fun} | |
389 | {make-string-scanner @<string> \&key :start :end @> @<string-scanner>} | |
390 | Construct and return a fresh @|string-scanner| object. The new scanner | |
391 | will read characters from @<string>, starting at index @<start> (which | |
392 | defaults to zero), and continuing until it reaches index @<end> (defaults | |
393 | to the end of the @<string>). | |
394 | \end{describe} | |
395 | ||
396 | \subsection{Character buffer scanners} \label{sec:parsing.scanner.charbuf} | |
397 | ||
398 | A \emph{character buffer scanner}, or \emph{charbuf scanner} for short, is an | |
399 | efficient scanner for reading characters from an input stream. Charbuf | |
400 | scanners implements the basic scanner, character buffer, place-capture, and | |
401 | file-location protocols. | |
402 | ||
403 | \begin{describe}{cls} | |
404 | {charbuf-scanner (character-scanner) | |
405 | \&key :stream :filename :line :column} | |
406 | The class of charbuf scanners. The scanner will read characters from | |
407 | @<stream>. Charbuf scanners implement the file-location protocol: the | |
408 | initial location is set from the given @<filename>, @<line> and @<column>; | |
409 | the scanner will update the location as it reads its input. | |
410 | \end{describe} | |
411 | ||
412 | \begin{describe}{cls}{charbuf-scanner-place} | |
413 | The class of place objects captured by a charbuf scanner. | |
414 | \end{describe} | |
415 | ||
416 | \begin{describe}{fun} | |
417 | {charbuf-scanner-place-p @<value> @> @<generalized-boolean>} | |
418 | Type predicate for charbuf scanner places: returns non-nil if @<value> is a | |
419 | place captured by a charbuf scanner, and nil otherwise. | |
420 | \end{describe} | |
421 | ||
422 | \begin{describe}{gf} | |
423 | {charbuf-scanner-map @<scanner> @<func> \&optional @<fail> | |
424 | \nlret @<result> @<successp> @<consumedp>} | |
425 | Read characters from the @<scanner>'s buffers. | |
426 | ||
427 | This is intended to be an efficient and versatile interface for reading | |
428 | characters from a scanner in bulk. The function @<func> is invoked | |
429 | repeatedly, as if by | |
430 | \begin{prog} | |
020b9e2b MW |
431 | (multiple-value-bind (@<donep> @<used>) \\ \ind\ind |
432 | (funcall @<func> @<buf> @<start> @<end>) \-\\ | |
1f7d590d MW |
433 | \textrm\ldots) |
434 | \end{prog} | |
435 | The argument @<buf> is a simple string; @<start> and @<end> are two | |
436 | nonnegative fixnums, indicating that the subsequence of @<buf> between | |
437 | @<start> (inclusive) and @<end> (exclusive) should be processed. If | |
438 | @<func>'s return value @<donep> is nil then @<used> is ignored: the | |
439 | function has consumed the entire buffer and wishes to read more. If | |
440 | @<donep> is non-nil, then it must be a fixnum such that $@<start> \le | |
441 | @<used> \le @<end>$: the function has consumed the buffer as far as @<used> | |
442 | (exclusive) and has completed successfully. | |
443 | ||
444 | If end-of-file is encountered before @<func> completes successfully then it | |
445 | fails: the @<fail> function is called with no arguments, and is expected to | |
446 | return two values. If omitted, @<fail> defaults to | |
447 | \begin{prog} | |
020b9e2b MW |
448 | (lambda () \\ \ind |
449 | (values nil nil)) | |
1f7d590d MW |
450 | \end{prog} |
451 | ||
452 | The @|charbuf-scanner-map| function returns three values. The first value | |
453 | is the non-nil @<donep> value returned by @<func> if @|charbuf-scanner-map| | |
454 | succeeded, or the first value returned by @<fail>; the second value is @|t| | |
455 | on success, or the second value returned by @<fail>; the third value is | |
456 | non-nil if @<func> consumed any input, i.e., it returned with @<donep> nil | |
457 | at least once, or with $@<used> > @<start>$. | |
458 | \end{describe} | |
459 | ||
460 | \subsection{Token scanners} \label{sec:parsing.scanner.token} | |
461 | ||
462 | \begin{describe}{cls} | |
463 | {token-scanner () \&key :filename (:line 1) (:column 0)} | |
464 | \end{describe} | |
465 | ||
466 | \begin{describe}{gf}{token-type @<scanner> @> @<type>} | |
467 | \end{describe} | |
468 | ||
469 | \begin{describe}{gf}{token-value @<scanner> @> @<value>} | |
470 | \end{describe} | |
471 | ||
472 | \begin{describe}{gf}{scanner-token @<scanner> @> @<type> @<value>} | |
473 | \end{describe} | |
474 | ||
475 | \begin{describe}{ty}{token-scanner-place} | |
476 | \end{describe} | |
477 | ||
478 | \begin{describe}{fun} | |
479 | {token-scanner-place-p @<value> @> @<generalized-boolean>} | |
480 | \end{describe} | |
481 | ||
482 | \subsection{List scanners} | |
483 | ||
484 | \begin{describe}{ty}{list-scanner} | |
485 | \end{describe} | |
486 | ||
487 | \begin{describe}{fun}{list-scanner-p @<value> @> @<generalized-boolean>} | |
488 | \end{describe} | |
489 | ||
490 | \begin{describe}{fun}{make-list-scanner @<list> @> @<list-scanner>} | |
491 | \end{describe} | |
492 | ||
493 | %%%-------------------------------------------------------------------------- | |
fcb6c0fb | 494 | \section{Parsing syntax} |
1f7d590d | 495 | |
fcb6c0fb MW |
496 | \begin{describe}{gf}{expand-parser-spec @<context> @<spec> @> @<form>} |
497 | \end{describe} | |
498 | ||
499 | \begin{describe}{gf} | |
500 | {expand-parser-form @<context> @<head> @<tail> @> @<form>} | |
501 | \end{describe} | |
502 | ||
503 | \begin{describe}{gf}{wrap-parser @<context> @<form> @> @<wrapped-form>} | |
504 | \end{describe} | |
505 | ||
506 | \begin{describe}{mac} | |
507 | {defparse @<name> (@[[ :context (@<var> @<context-class>) @]] | |
020b9e2b MW |
508 | @<destructuring-lambda-list-item>^*) \\ \ind |
509 | @[[ @<declaration>^* @! @<doc-string> @]] \\ | |
510 | @<form>^* | |
511 | \-\nlret @<name>} | |
fcb6c0fb MW |
512 | \end{describe} |
513 | ||
514 | \begin{describe}{mac} | |
515 | {with-parser-context | |
020b9e2b MW |
516 | (@<context-class> @{ @<init-keyword> @<value> @}^*) \\ \ind |
517 | @<declaration>^* \\ | |
518 | @<form>^* | |
519 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
520 | \end{describe} |
521 | ||
522 | \begin{describe}{lmac} | |
523 | {parse @<parser> @> @<result> @<success-flag> @<consumed-flag>} | |
524 | \end{describe} | |
525 | ||
3f921e3f MW |
526 | \begin{describe}{mac} |
527 | {parser @<lambda-list> | |
528 | @[[ @<declaration>^* @! @<doc-string> @]] | |
529 | @<parser> | |
530 | @> @<function>} | |
531 | \end{describe} | |
532 | ||
fcb6c0fb MW |
533 | \begin{describe}{gf}{parser-at-eof-p @<context> @> @<form>} |
534 | \end{describe} | |
535 | ||
536 | \begin{describe}{gf}{parser-step @<context> @> @<form>} | |
537 | \end{describe} | |
538 | ||
539 | \begin{describe}{sym}{it} | |
540 | \end{describe} | |
541 | ||
542 | \begin{describe}{mac} | |
543 | {if-parse (@[[ \=:result @<result-var> @! | |
020b9e2b MW |
544 | :expected @<expected-var> @! \+\\ |
545 | :consumedp @<consumed-var> @]]) \-\\ \ind\ind | |
546 | @<parser> \-\\ | |
547 | @<consequent> \\ | |
548 | @[@<alternatve>@] | |
549 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
550 | \end{describe} |
551 | ||
552 | \begin{describe}{mac} | |
020b9e2b MW |
553 | {when-parse (@[@<result-var>@]) @<parser> \\ \ind |
554 | @<form>^* | |
555 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
556 | \end{describe} |
557 | ||
558 | \begin{describe}{mac} | |
559 | {cond-parse (@[[ \=:result @<result-var> @! | |
020b9e2b MW |
560 | :expected @<expected-var> @! \+\\ |
561 | :consumedp @<consumed-var> @]]) \-\\ \ind | |
562 | @{ (@<parser> @<form>^*) @}^* | |
563 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
564 | \end{describe} |
565 | ||
566 | \begin{describe}{parse}{:eof} | |
567 | \end{describe} | |
568 | ||
569 | \begin{describe}{parseform}{lisp @<form>^*} | |
570 | \end{describe} | |
571 | ||
572 | \begin{describe}{parseform}{label @<parser>} | |
573 | \end{describe} | |
574 | ||
575 | \begin{describe}{parse}{t} | |
576 | \end{describe} | |
577 | ||
578 | \begin{describe}{parseform}{t @<value>} | |
579 | \end{describe} | |
580 | ||
581 | \begin{describe}{parse}{nil} | |
582 | \end{describe} | |
583 | ||
584 | \begin{describe}{parseform}{nil @<indicator>} | |
585 | \end{describe} | |
586 | ||
587 | \begin{describe}{parseform}{when @<cond> @<parser>} | |
588 | \end{describe} | |
589 | ||
590 | \begin{describe}{parseform} | |
020b9e2b MW |
591 | {seq (@{ @<atomic-parser-spec> @! |
592 | (@[@<var>@] @<parser>) @}^*) \\ \ind | |
cd35a54e | 593 | @<form>^*} |
fcb6c0fb MW |
594 | \end{describe} |
595 | ||
596 | \begin{describe}{parseform}{and @<parser>^*} | |
597 | \end{describe} | |
598 | ||
599 | \begin{describe}{parseform}{or @<parser>^*} | |
600 | \end{describe} | |
601 | ||
602 | \begin{describe}{parseform}{? @<parser> @[@<default>@]} | |
603 | \end{describe} | |
604 | ||
605 | \begin{describe}{parseform} | |
020b9e2b MW |
606 | {many (\=@<accumulator-var> @<init-form> @<update-form> \+\\ |
607 | @[[ \=:new @<new-var> @! :final @<final-form> @! \+\\ | |
608 | :min @<minimum> @! :max @<maximum> @! \\ | |
609 | :commitp @<commitp> @]]) \-\-\\ \ind | |
fcb6c0fb MW |
610 | @<item-parser> @[@<sep-parser>@]} |
611 | \end{describe} | |
612 | ||
613 | \begin{describe}{parseform} | |
614 | {list (@[[ :min @<minimum> @! :max @<maximum> @! | |
020b9e2b | 615 | :commitp @<commitp> @]]) \\ \ind |
fcb6c0fb MW |
616 | @<item-parser> @[@<sep-parser>@]} |
617 | \end{describe} | |
618 | ||
619 | \begin{describe}{parseform} | |
620 | {skip-many (@[[ :min @<minimum> @! :max @<maximum> @! | |
020b9e2b | 621 | :commitp @<commitp> @]]) \\ \ind |
fcb6c0fb MW |
622 | @<item-parser> @[@<sep-parser>@]} |
623 | \end{describe} | |
624 | ||
625 | \begin{describe}{fun}{call-pluggable-parser @<symbol> \&rest @<args>} | |
626 | \end{describe} | |
627 | ||
628 | \begin{describe}{parseform}{plug @<symbol> @<arg>^*} | |
629 | \end{describe} | |
630 | ||
631 | \begin{describe}{fun} | |
632 | {pluggable-parser-add @<symbol> @<tag> @<parser-function>} | |
633 | \end{describe} | |
634 | ||
635 | \begin{describe}{mac} | |
cac85e0b MW |
636 | {define-pluggable-parser @<symbol> @<tag> @<lambda-list> |
637 | @[[ @<declaration>^* @! @<doc-string> @]] | |
638 | @<form>^*} | |
fcb6c0fb MW |
639 | \end{describe} |
640 | ||
641 | \begin{describe}{gf}{parser-capture-place @<context> @> @<form>} | |
642 | \end{describe} | |
643 | ||
644 | \begin{describe}{gf}{parser-restore-place @<context> @<place> @> @<form>} | |
645 | \end{describe} | |
646 | ||
647 | \begin{describe}{gf}{parser-release-place @<context> @<place> @> @<form>} | |
648 | \end{describe} | |
649 | ||
650 | \begin{describe}{gf} | |
651 | {parser-places-must-be-released-p @<context> @> @<generalized-boolean>>} | |
652 | \end{describe} | |
653 | ||
654 | \begin{describe}{mac} | |
cac85e0b MW |
655 | {with-parser-place (@<place-var> @<context>) |
656 | @[[ @<declaration>^* @! @<doc-string> @]] | |
657 | @<form>^*} | |
fcb6c0fb MW |
658 | \end{describe} |
659 | ||
660 | \begin{describe}{parseform}{peek @<parser>} | |
661 | \end{describe} | |
662 | ||
2b8759bf MW |
663 | \begin{describe}{parseform}{commit} |
664 | \end{describe} | |
665 | ||
fcb6c0fb MW |
666 | \begin{describe}{cls}{character-parser-context () \&key} |
667 | \end{describe} | |
668 | ||
669 | \begin{describe}{gf}{parser-current-char @<context> @> @<form>} | |
670 | \end{describe} | |
671 | ||
672 | \begin{describe}{parseform} | |
673 | {if-char (@[@<result-var>@]) @<condition> @<consequent> @<alternative>} | |
674 | \end{describe} | |
675 | ||
676 | \begin{describe}{parseform}{char @<character>} | |
677 | \end{describe} | |
678 | ||
679 | \begin{describe}[char]{parse}{@<character>} | |
680 | \end{describe} | |
681 | ||
682 | \begin{describe}[string]{parse}{@<string>} | |
683 | \end{describe} | |
684 | ||
685 | \begin{describe}{parse}{:any} | |
686 | \end{describe} | |
687 | ||
688 | \begin{describe}{parseform}{satisfies @<predicate>} | |
689 | \end{describe} | |
690 | ||
691 | \begin{describe}{parseform}{not @<character>} | |
692 | \end{describe} | |
693 | ||
694 | \begin{describe}{parseform}{filter @<predicate>} | |
695 | \end{describe} | |
696 | ||
697 | \begin{describe}{parse}{:whitespace} | |
698 | \end{describe} | |
699 | ||
700 | \begin{describe}{cls}{token-parser-context () \&key} | |
701 | \end{describe} | |
702 | ||
703 | \begin{describe}{gf}{parser-token-type @<context> @> @<form>} | |
704 | \end{describe} | |
705 | ||
706 | \begin{describe}{gf}{parser-token-value @<context> @> @<form>} | |
707 | \end{describe} | |
708 | ||
709 | \begin{describe}{parseform}{token @<type> @[@<value>@] @[:peekp @<peek>@]} | |
710 | \end{describe} | |
711 | ||
712 | \begin{describe}[atom]{parse}{@<atom>} | |
713 | \end{describe} | |
714 | ||
715 | \begin{describe}[string]{parse}{@<string>} | |
716 | \end{describe} | |
717 | ||
718 | \begin{describe}{cls}{scanner-context () \&key :scanner} | |
719 | \end{describe} | |
720 | ||
721 | \begin{describe}{gf}{parse-scanner @<context> @> @<symbol>} | |
722 | \end{describe} | |
723 | ||
724 | \begin{describe}{cls} | |
725 | {character-scanner-context (scanner-context character-parser-context) | |
726 | \&key :scanner} | |
727 | \end{describe} | |
728 | ||
729 | \begin{describe}{cls} | |
730 | {token-scanner-context (scanner-context token-parser-context) | |
731 | \&key :scanner} | |
732 | \end{describe} | |
733 | ||
2c7465ac MW |
734 | \begin{describe}{gf}{push-operator @<operator> @<state>} |
735 | \end{describe} | |
736 | ||
737 | \begin{describe}{gf}{push-value @<value> @<state>} | |
738 | \end{describe} | |
739 | ||
740 | \begin{describe}{gf}{apply-operator @<operator> @<state>} | |
741 | \end{describe} | |
742 | ||
743 | \begin{describe}{gf}{operator-push-action @<left> @<right>} | |
744 | \end{describe} | |
745 | ||
746 | \begin{describe}{parseform} | |
020b9e2b | 747 | {expr \=(@[[ :nestedp @<nestedp-var> @]]) \+\\ |
2c7465ac MW |
748 | @<operand-parser> @<binop-parser> |
749 | @<preop-parser> @<postop-parser>} | |
750 | \end{describe} | |
751 | ||
752 | \begin{describe}{gf}{operator-left-precedence @<operator> @> @<prec>} | |
753 | \end{describe} | |
754 | ||
755 | \begin{describe}{gf}{operator-right-precedence @<operator> @> @<prec>} | |
756 | \end{describe} | |
757 | ||
758 | \begin{describe}{gf}{operator-associativity @<operator> @> @<assoc>} | |
759 | \end{describe} | |
760 | ||
761 | \begin{describe}{cls}{prefix-operator () \&key} | |
762 | \end{describe} | |
763 | ||
764 | \begin{describe}{cls}{simple-operator () \&key :name :function} | |
765 | \end{describe} | |
766 | ||
767 | \begin{describe}{cls} | |
768 | {simple-unary-operator (simple-operator) \&key :name :function} | |
769 | \end{describe} | |
770 | ||
771 | \begin{describe*} | |
772 | {\quad\=\kill | |
020b9e2b MW |
773 | \dhead{cls}{simple-binary-operator (simple-operator) \\ \> |
774 | \&key :name :function | |
775 | :lprec :rprec :associativity} | |
2c7465ac MW |
776 | \dhead{cls}{simple-postfix-operator (simple-unary-operator) \\ \> |
777 | \&key :name :function :lprec :rprec} | |
778 | \dhead{cls}{simple-prefix-operator | |
020b9e2b | 779 | (prefix-operator simple-unary-operator) \\ \> |
2c7465ac MW |
780 | \&key :name :function :rprec}} |
781 | \end{describe*} | |
782 | ||
783 | \begin{describe*} | |
784 | {\dhead{mac}{preop @<name> (@<operand-var> @<lprec>) | |
cac85e0b | 785 | @<declaration>^* @<form>^* |
2c7465ac MW |
786 | @> @<prefix-operator>} |
787 | \dhead{mac}{postop @<name> | |
788 | (@<operand-var> @<lprec> @[[ :rprec @<rprec> @]]) | |
cac85e0b MW |
789 | @<declaration>^* @<form>^* |
790 | \nlret @<postfix-operator>} | |
2c7465ac | 791 | \dhead{mac}{binop @<name> (@<operand-var> @<lprec> @<rprec> @<assoc>) |
cac85e0b | 792 | @<declaration>^*@<form>^* |
2c7465ac MW |
793 | @> @<binary-operator>}} |
794 | \end{describe*} | |
795 | ||
796 | \begin{describe*} | |
797 | {\dhead{cls}{parenthesis () \&key :tag} | |
798 | \dhead{cls}{open-parenthesis (parenthesis prefix-operator) \&key :tag} | |
799 | \dhead{cls}{close-parenthesis (parenthesis) \&key :tag}} | |
800 | \end{describe*} | |
801 | ||
802 | \begin{describe*} | |
803 | {\dhead{fun}{lparen @<tag> @> @<open-paren>} | |
804 | \dhead{fun}{rparen @<tag> @> @<close-paren>}} | |
805 | \end{describe*} | |
fcb6c0fb MW |
806 | |
807 | %%%------------------------------------------------------------------------- | |
1f7d590d MW |
808 | \section{Lexical analyser} |
809 | ||
2c7465ac MW |
810 | \begin{describe}{cls} |
811 | {sod-token-scanner (token-scanner) | |
812 | \&key :filename (:line 1) (:column 0) :char-scanner} | |
813 | \end{describe} | |
814 | ||
815 | \begin{describe}{fun}{define-indicator @<indicator> @<description>} | |
816 | \end{describe} | |
817 | ||
40d95de7 MW |
818 | \begin{describe*} |
819 | {\dhead{cls}{lexer-error (parser-error base-lexer-error) \\ \ind | |
820 | \&key :expected :found :location \-} | |
821 | \dhead{cls}{syntax-error (parser-error base-syntax-error) \\ \ind | |
822 | \&key :expected :found :location \-}} | |
823 | \end{describe*} | |
824 | ||
d63df20a MW |
825 | \begin{describe}{fun} |
826 | {syntax-error @<scanner> @<expected> \&key :continuep :location} | |
2c7465ac MW |
827 | \end{describe} |
828 | ||
829 | \begin{describe}{fun} | |
d63df20a | 830 | {lexer-error @<char-scanner> @<expected> \&key :location} |
2c7465ac MW |
831 | \end{describe} |
832 | ||
833 | \begin{describe}{parseform} | |
834 | {skip-until (@[[ :keep-end @<keep-end-flag> @]]) @<token-type>^*} | |
835 | \end{describe} | |
836 | ||
5fa27d76 | 837 | \begin{describe}{parseform} |
450a4be6 | 838 | {error (@[[ :ignore-unconsumed @<flag> @! |
b5911ce8 MW |
839 | :force-process @<flag> @]]) \\ \ind\ind |
840 | @<sub-parser> @<recover-parser> \-\\ | |
841 | @<declaration>^* \\ | |
842 | @<form>^*} | |
2c7465ac MW |
843 | \end{describe} |
844 | ||
ae7a3c8f MW |
845 | \begin{describe}{parseform}{must @<sub-parser> @[@<default>@]} |
846 | \end{describe} | |
847 | ||
2c7465ac MW |
848 | \begin{describe}{fun} |
849 | {scan-comment @<char-scanner> | |
850 | @> @<result> @<success-flag> @<consumed-flag>} | |
851 | \end{describe} | |
852 | ||
1f7d590d MW |
853 | %%%----- That's all, folks -------------------------------------------------- |
854 | ||
855 | %%% Local variables: | |
856 | %%% mode: LaTeX | |
857 | %%% TeX-master: "sod.tex" | |
858 | %%% TeX-PDF-mode: t | |
859 | %%% End: |