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