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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>} | |
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74 | \begin{describe}{meth}{file-location} |
75 | {file-location (@<floc> file-location) @> @<floc>} | |
fcb6c0fb | 76 | \end{describe} |
87883222 MW |
77 | \begin{describe}{meth}{stream} |
78 | {file-location (@<stream> stream) @> @<floc>} | |
fcb6c0fb | 79 | \end{describe} |
87883222 MW |
80 | \begin{describe}{meth}{t} |
81 | {file-location (@<any> t) @> @<floc>} | |
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82 | \end{describe} |
83 | \end{describe} | |
84 | ||
85 | \begin{describe}{cls}{condition-with-location (condition) \&key :location} | |
86 | \end{describe} | |
87 | ||
87883222 | 88 | \begin{describe}{meth}{condition-with-location} |
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89 | {file-location (@<condition> condition-with-location) @> @<floc>} |
90 | \end{describe} | |
91 | ||
92 | \begin{describe*} | |
93 | {\quad\=\quad\=\kill | |
94 | \dhead{cls} | |
020b9e2b | 95 | {error-with-location (condition-with-location error) \\ \> |
acaf88ad | 96 | \&key :location} |
fcb6c0fb | 97 | \dhead{cls} |
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98 | {warning-with-location (condition-with-location warning) \\ \> |
99 | \&key :location} | |
fcb6c0fb | 100 | \dhead{cls} |
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101 | {information-with-location (condition-with-location information) \\ \> |
102 | \&key :location} | |
103 | \dhead{cls} | |
acaf88ad | 104 | {enclosing-error-with-location |
020b9e2b | 105 | (enclosing-error-with-location error) \\ \> |
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106 | \&key :condition :location} |
107 | \dhead{cls} | |
108 | {enclosing-warning-with-location | |
020b9e2b | 109 | (enclosing-condition-with-location warning) \\ \> |
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110 | \&key :condition :location} |
111 | \dhead{cls} | |
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112 | {enclosing-information-with-location |
113 | (enclosing-condition-with-location information) \\ \> | |
114 | \&key :condition :location} | |
115 | \dhead{cls} | |
acaf88ad | 116 | {simple-condition-with-location |
020b9e2b | 117 | (condition-with-location simple-condition) \\ \> |
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118 | \&key :format-control :format-arguments :location} |
119 | \dhead{cls} | |
120 | {simple-error-with-location | |
020b9e2b | 121 | (error-with-location simple-error) \\ \> |
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122 | \&key :format-control :format-arguments :location} |
123 | \dhead{cls} | |
124 | {simple-warning-with-location | |
020b9e2b | 125 | (warning-with-location simple-warning) \\ \> |
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126 | \&key :format-control :format-arguments :location} |
127 | \dhead{cls} | |
128 | {simple-information-with-location | |
129 | (information-with-location simple-information) \\ \> | |
acaf88ad | 130 | \&key :format-control :format-arguments :location}} |
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131 | \end{describe*} |
132 | ||
388ab382 MW |
133 | \begin{describe}{gf} |
134 | {enclosing-condition-with-location-type @<condition> @> @<symbol>} | |
135 | \end{describe} | |
136 | ||
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137 | \begin{describe}{fun} |
138 | {make-condition-with-location @<default-type> @<floc> | |
139 | @<datum> \&rest @<arguments> | |
140 | \nlret @<condition-with-location>} | |
141 | \end{describe} | |
142 | ||
143 | \begin{describe*} | |
144 | {\dhead{fun}{error-with-location @<floc> @<datum> \&rest @<arguments>} | |
145 | \dhead{fun}{cerror-with-location @<floc> @<continue-string> | |
146 | @<datum> \&rest @<arguments>} | |
147 | \dhead{fun}{cerror*-with-location @<floc> @<datum> \&rest @<arguments>} | |
148 | \dhead{fun}{warn-with-location @<floc> @<datum> \&rest @<arguments>}} | |
149 | \end{describe*} | |
150 | ||
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151 | \begin{describe*} |
152 | {\dhead{cls}{parser-error (error) \\ \ind | |
153 | \&key :expected :found \-} | |
154 | \dhead{gf}{parser-error-expected @<condition> @> @<list>} | |
155 | \dhead{gf}{parser-error-found @<condition> @> @<value>}} | |
156 | \end{describe*} | |
157 | ||
158 | \begin{describe}{fun} | |
159 | {report-parser-error @<error> @<stream> @<show-expected> @<show-found>} | |
160 | \end{describe} | |
161 | ||
162 | \begin{describe*} | |
163 | {\quad\=\kill | |
164 | \dhead{cls}{base-lexer-error (error-with-location) \&key :location} | |
165 | \dhead{cls}{simple-lexer-error | |
166 | (base-lexer-error simple-error-with-location) \\\> | |
167 | \&key :format-control :format-arguments :location} | |
168 | \dhead{cls}{base-syntax-error (error-with-location) \&key :location} | |
169 | \dhead{cls}{simple-syntax-error | |
170 | (base-syntax-error simple-error-with-location) \\\> | |
171 | \&key :format-control :format-arguments :location}} | |
172 | \end{describe*} | |
173 | ||
fcb6c0fb | 174 | \begin{describe}{mac} |
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175 | {with-default-error-location (@<floc>) @<declaration>^* @<form>^* |
176 | @> @<value>^*} | |
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177 | \end{describe} |
178 | ||
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179 | \begin{describe}{gf}{classify-condition @<condition> @> @<string>} |
180 | \begin{describe*} | |
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181 | {\dhead{meth}{error} |
182 | {classify-condition (@<condition> error) @> @<string>} | |
183 | \dhead{meth}{warning} | |
184 | {classify-condition (@<condition> warning) @> @<string>} | |
185 | \dhead{meth}{information} | |
186 | {classify-condition (@<condition> information) | |
187 | @> @<string>} | |
188 | \dhead{meth}{base-lexer-error} | |
189 | {classify-condition (@<condition> base-lexer-error) | |
190 | @> @<string>} | |
191 | \dhead{meth}{base-syntax-error} | |
192 | {classify-condition (@<condition> base-syntax-error) | |
193 | @> @<string>}} | |
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194 | \end{describe*} |
195 | \end{describe} | |
196 | ||
fcb6c0fb | 197 | \begin{describe}{mac} |
cac85e0b | 198 | {count-and-report-errors () @<declaration>^* @<form>^* |
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199 | @> @<value> @<n-errors> @<n-warnings>} |
200 | \end{describe} | |
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201 | |
202 | %%%-------------------------------------------------------------------------- | |
203 | \section{Scanners} \label{sec:parsing.scanner} | |
204 | ||
205 | A \emph{scanner} is an object which keeps track of a parser's progress as it | |
206 | works through its input. There's no common base class for scanners: a | |
207 | scanner is simply any object which implements the scanner protocol described | |
208 | here. | |
209 | ||
210 | A scanner maintains a sequence of items to read. It can step forwards | |
211 | through the items, one at a time, until it reaches the end (if, indeed, the | |
212 | sequence is finite, which it needn't be). Until that point, there is a | |
213 | current item, though there's no protocol for accessing it at this level | |
214 | because the nature of the items is left unspecified. | |
215 | ||
216 | Some scanners support an additional \emph{place-capture} protocol which | |
217 | allows rewinding the scanner to an earlier point in the input so that it can | |
218 | be scanned again. | |
219 | ||
220 | \subsection{Basic scanner protocol} \label{sec:parsing.scanner.basic} | |
221 | ||
222 | The basic protocol supports stepping the scanner forward through its input | |
223 | sequence, and detecting the end of the sequence. | |
224 | ||
225 | \begin{describe}{gf}{scanner-step @<scanner>} | |
226 | Advance the @<scanner> to the next item, which becomes current. | |
227 | ||
228 | It is an error to step the scanner if the scanner is at end-of-file. | |
229 | \end{describe} | |
230 | ||
231 | \begin{describe}{gf}{scanner-at-eof-p @<scanner> @> @<generalized-boolean>} | |
232 | Return non-nil if the scanner is at end-of-file, i.e., there are no more | |
233 | items to read. | |
234 | ||
235 | If nil is returned, there is a current item, and it is safe to step the | |
236 | scanner again; otherwise, it is an error to query the current item or to | |
237 | step the scanner. | |
238 | \end{describe} | |
239 | ||
240 | \subsection{Place-capture scanner protocol} \label{sec:parsing.scanner.place} | |
241 | ||
242 | The place-capture protocol allows rewinding to an earlier point in the | |
243 | sequence. Not all scanners support the place-capture protocol. | |
244 | ||
245 | To rewind a scanner to a particular point, that point must be \emph{captured} | |
246 | as a \emph{place} when it's current -- so you must know in advance that this | |
247 | is an interesting place that's worth capturing. The type of place returned | |
248 | depends on the type of scanner. Given a captured place, the scanner can be | |
249 | rewound to the position held in it. | |
250 | ||
251 | Depending on how the scanner works, holding onto a captured place might | |
054e8f8f | 252 | consume a lot of memory or cause poor performance. For example, if the |
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253 | scanner is reading from an input stream, having a captured place means that |
254 | data from that point on must be buffered in case the program needs to rewind | |
255 | the scanner and read that data again. Therefore it's possible to | |
256 | \emph{release} a place when it turns out not to be needed any more. | |
257 | ||
258 | \begin{describe}{gf}{scanner-capture-place @<scanner> @> @<place>} | |
259 | Capture the @<scanner>'s current position as a place, and return the place. | |
260 | \end{describe} | |
261 | ||
262 | \begin{describe}{gf}{scanner-restore-place @<scanner> @<place>} | |
263 | Rewind the @<scanner> to the state it was in when @<place> was captured. | |
264 | In particular, the item that was current when the @<place> was captured | |
265 | becomes current again. | |
266 | ||
267 | It is an error to restore a @<place> that has been released, or if the | |
268 | @<place> wasn't captured from the @<scanner>. | |
269 | \end{describe} | |
270 | ||
271 | \begin{describe}{gf}{scanner-release-place @<scanner> @<place>} | |
272 | Release the @<place>, to avoid having to maintaining the ability to restore | |
273 | it after it's not needed any more.. | |
274 | ||
275 | It is an error if the @<place> wasn't captured from the @<scanner>. | |
276 | \end{describe} | |
277 | ||
278 | \begin{describe}{mac} | |
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279 | {with-scanner-place (@<place> @<scanner>) @<declarations>^* @<form>^* |
280 | @> @<value>^*} | |
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281 | Capture the @<scanner>'s current position as a place, evaluate the @<form>s |
282 | as an implicit progn with the variable @<place> bound to the captured | |
283 | place. When control leaves the @<form>s, the place is released. The | |
284 | return values are the values of the final @<form>. | |
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285 | \end{describe} |
286 | ||
287 | \subsection{Scanner file-location protocol} \label{sec:parsing.scanner.floc} | |
288 | ||
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289 | Some scanners participate in the file-location protocol |
290 | (\xref{sec:parsing.floc}). They implement a method on @|file-location| which | |
291 | collects the necessary information using scanner-specific functions described | |
292 | here. | |
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293 | |
294 | \begin{describe}{fun}{scanner-file-location @<scanner> @> @<file-location>} | |
295 | Return a @|file-location| object describing the current position of the | |
296 | @<scanner>. | |
297 | ||
298 | This calls the @|scanner-filename|, @|scanner-line| and @|scanner-column| | |
299 | generic functions on the scanner, and uses these to fill in an appropriate | |
300 | @|file-location|. | |
301 | ||
302 | Since there are default methods on these generic functions, it is not an | |
303 | error to call @|scanner-file-location| on any kind of value, but it might | |
304 | not be very useful. This function exists to do the work of appropriately | |
305 | specialized methods on @|file-location|. | |
306 | \end{describe} | |
307 | ||
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308 | \begin{describe*} |
309 | {\dhead{gf}{scanner-filename @<scanner> @> @<string>} | |
310 | \dhead{gf}{scanner-line @<scanner> @> @<integer>} | |
311 | \dhead{gf}{scanner-column @<scanner> @> @<integer>}} | |
312 | Return the filename, line and column components of the @<scanner>'s current | |
313 | position, for use in assembling a @<file-location>: see the | |
314 | @|scanner-file-location| function. | |
1f7d590d | 315 | |
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316 | There are default methods on all three generic functions which simply |
317 | return nil. | |
318 | \end{describe*} | |
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319 | |
320 | \subsection{Character scanners} \label{sec:parsing.scanner.char} | |
321 | ||
322 | Character scanners are scanners which read sequences of characters. | |
323 | ||
324 | \begin{describe}{cls}{character-scanner () \&key} | |
325 | Base class for character scanners. This provides some very basic | |
326 | functionality. | |
327 | ||
328 | Not all character scanners are subclasses of @|character-scanner|. | |
329 | \end{describe} | |
330 | ||
331 | \begin{describe}{gf}{scanner-current-char @<scanner> @> @<character>} | |
332 | Returns the current character. | |
333 | \end{describe} | |
334 | ||
335 | \begin{describe}{gf}{scanner-unread @<scanner> @<character>} | |
336 | Rewind the @<scanner> by one step. The @<chararacter> must be the previous | |
337 | current character, and becomes the current character again. It is an error | |
054e8f8f | 338 | if: the @<scanner> has reached end-of-file; the @<scanner> has never been |
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339 | stepped; or @<character> was not the previous current character. |
340 | \end{describe} | |
341 | ||
342 | \begin{describe}{gf} | |
343 | {scanner-interval @<scanner> @<place-a> \&optional @<place-b> | |
344 | @> @<string>} | |
345 | Return the characters in the @<scanner>'s input from @<place-a> up to (but | |
346 | not including) @<place-b>. | |
347 | ||
348 | The characters are returned as a string. If @<place-b> is omitted, return | |
349 | the characters up to (but not including) the current position. It is an | |
350 | error if @<place-b> precedes @<place-a> or they are from different | |
351 | scanners. | |
352 | ||
353 | This function is a character-scanner-specific extension to the | |
354 | place-capture protocol; not all character scanners implement the | |
355 | place-capture protocol, and some that do may not implement this function. | |
356 | \end{describe} | |
357 | ||
358 | \subsubsection{Stream access to character scanners} | |
359 | Sometimes it can be useful to apply the standard Lisp character input | |
360 | operations to the sequence of characters held by a character scanner. | |
361 | ||
362 | \begin{describe}{gf}{make-scanner-stream @<scanner> @> @<stream>} | |
363 | Returns a fresh input @|stream| object which fetches input characters from | |
364 | the character scanner object @<scanner>. Reading characters from the | |
365 | stream steps the scanner. The stream will reach end-of-file when the | |
366 | scanner reports end-of-file. If the scanner implements the file-location | |
367 | protocol then reading from the stream will change the file location in an | |
368 | appropriate manner. | |
369 | ||
370 | This is mostly useful for applying standard Lisp stream functions, most | |
371 | particularly the @|read| function, in the middle of a parsing operation. | |
372 | \end{describe} | |
373 | ||
374 | \begin{describe}{cls}{character-scanner-stream (stream) \&key :scanner} | |
375 | A Common Lisp input @|stream| object which works using the character | |
376 | scanner protocol. Any @<scanner> which implements the base scanner and | |
377 | character scanner protocols is suitable. See @|make-scanner-stream|. | |
378 | \end{describe} | |
379 | ||
380 | \subsection{String scanners} \label{sec:parsing.scanner.string} | |
381 | ||
382 | A \emph{string scanner} is a simple kind of character scanner which reads | |
383 | input from a string object. String scanners implement the character scanner | |
384 | and place-capture protocols. | |
385 | ||
386 | \begin{describe}{cls}{string-scanner} | |
387 | The class of string scanners. The @|string-scanner| class is not a | |
388 | subclass of @|character-scanner|. | |
389 | \end{describe} | |
390 | ||
391 | \begin{describe}{fun}{string-scanner-p @<value> @> @<generalized-boolean>} | |
392 | Return non-nil if @<value> is a @|string-scanner| object; otherwise return | |
393 | nil. | |
394 | \end{describe} | |
395 | ||
396 | \begin{describe}{fun} | |
397 | {make-string-scanner @<string> \&key :start :end @> @<string-scanner>} | |
398 | Construct and return a fresh @|string-scanner| object. The new scanner | |
399 | will read characters from @<string>, starting at index @<start> (which | |
400 | defaults to zero), and continuing until it reaches index @<end> (defaults | |
401 | to the end of the @<string>). | |
402 | \end{describe} | |
403 | ||
404 | \subsection{Character buffer scanners} \label{sec:parsing.scanner.charbuf} | |
405 | ||
406 | A \emph{character buffer scanner}, or \emph{charbuf scanner} for short, is an | |
407 | efficient scanner for reading characters from an input stream. Charbuf | |
408 | scanners implements the basic scanner, character buffer, place-capture, and | |
409 | file-location protocols. | |
410 | ||
411 | \begin{describe}{cls} | |
412 | {charbuf-scanner (character-scanner) | |
413 | \&key :stream :filename :line :column} | |
414 | The class of charbuf scanners. The scanner will read characters from | |
415 | @<stream>. Charbuf scanners implement the file-location protocol: the | |
416 | initial location is set from the given @<filename>, @<line> and @<column>; | |
417 | the scanner will update the location as it reads its input. | |
418 | \end{describe} | |
419 | ||
420 | \begin{describe}{cls}{charbuf-scanner-place} | |
421 | The class of place objects captured by a charbuf scanner. | |
422 | \end{describe} | |
423 | ||
424 | \begin{describe}{fun} | |
425 | {charbuf-scanner-place-p @<value> @> @<generalized-boolean>} | |
426 | Type predicate for charbuf scanner places: returns non-nil if @<value> is a | |
427 | place captured by a charbuf scanner, and nil otherwise. | |
428 | \end{describe} | |
429 | ||
430 | \begin{describe}{gf} | |
431 | {charbuf-scanner-map @<scanner> @<func> \&optional @<fail> | |
054e8f8f | 432 | \nlret @<result> @<success-flag> @<consumed-flag>} |
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433 | Read characters from the @<scanner>'s buffers. |
434 | ||
435 | This is intended to be an efficient and versatile interface for reading | |
436 | characters from a scanner in bulk. The function @<func> is invoked | |
437 | repeatedly, as if by | |
438 | \begin{prog} | |
020b9e2b MW |
439 | (multiple-value-bind (@<donep> @<used>) \\ \ind\ind |
440 | (funcall @<func> @<buf> @<start> @<end>) \-\\ | |
1f7d590d MW |
441 | \textrm\ldots) |
442 | \end{prog} | |
443 | The argument @<buf> is a simple string; @<start> and @<end> are two | |
444 | nonnegative fixnums, indicating that the subsequence of @<buf> between | |
445 | @<start> (inclusive) and @<end> (exclusive) should be processed. If | |
446 | @<func>'s return value @<donep> is nil then @<used> is ignored: the | |
447 | function has consumed the entire buffer and wishes to read more. If | |
054e8f8f | 448 | @<donep> is non-nil, then @<used> must be a fixnum such that $@<start> \le |
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449 | @<used> \le @<end>$: the function has consumed the buffer as far as @<used> |
450 | (exclusive) and has completed successfully. | |
451 | ||
452 | If end-of-file is encountered before @<func> completes successfully then it | |
453 | fails: the @<fail> function is called with no arguments, and is expected to | |
454 | return two values. If omitted, @<fail> defaults to | |
455 | \begin{prog} | |
020b9e2b MW |
456 | (lambda () \\ \ind |
457 | (values nil nil)) | |
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458 | \end{prog} |
459 | ||
460 | The @|charbuf-scanner-map| function returns three values. The first value | |
461 | is the non-nil @<donep> value returned by @<func> if @|charbuf-scanner-map| | |
462 | succeeded, or the first value returned by @<fail>; the second value is @|t| | |
463 | on success, or the second value returned by @<fail>; the third value is | |
464 | non-nil if @<func> consumed any input, i.e., it returned with @<donep> nil | |
465 | at least once, or with $@<used> > @<start>$. | |
466 | \end{describe} | |
467 | ||
468 | \subsection{Token scanners} \label{sec:parsing.scanner.token} | |
469 | ||
470 | \begin{describe}{cls} | |
471 | {token-scanner () \&key :filename (:line 1) (:column 0)} | |
472 | \end{describe} | |
473 | ||
474 | \begin{describe}{gf}{token-type @<scanner> @> @<type>} | |
475 | \end{describe} | |
476 | ||
477 | \begin{describe}{gf}{token-value @<scanner> @> @<value>} | |
478 | \end{describe} | |
479 | ||
480 | \begin{describe}{gf}{scanner-token @<scanner> @> @<type> @<value>} | |
481 | \end{describe} | |
482 | ||
483 | \begin{describe}{ty}{token-scanner-place} | |
484 | \end{describe} | |
485 | ||
486 | \begin{describe}{fun} | |
487 | {token-scanner-place-p @<value> @> @<generalized-boolean>} | |
488 | \end{describe} | |
489 | ||
490 | \subsection{List scanners} | |
491 | ||
492 | \begin{describe}{ty}{list-scanner} | |
493 | \end{describe} | |
494 | ||
495 | \begin{describe}{fun}{list-scanner-p @<value> @> @<generalized-boolean>} | |
496 | \end{describe} | |
497 | ||
498 | \begin{describe}{fun}{make-list-scanner @<list> @> @<list-scanner>} | |
499 | \end{describe} | |
500 | ||
501 | %%%-------------------------------------------------------------------------- | |
fcb6c0fb | 502 | \section{Parsing syntax} |
1f7d590d | 503 | |
fcb6c0fb MW |
504 | \begin{describe}{gf}{expand-parser-spec @<context> @<spec> @> @<form>} |
505 | \end{describe} | |
506 | ||
507 | \begin{describe}{gf} | |
508 | {expand-parser-form @<context> @<head> @<tail> @> @<form>} | |
509 | \end{describe} | |
510 | ||
511 | \begin{describe}{gf}{wrap-parser @<context> @<form> @> @<wrapped-form>} | |
512 | \end{describe} | |
513 | ||
514 | \begin{describe}{mac} | |
515 | {defparse @<name> (@[[ :context (@<var> @<context-class>) @]] | |
020b9e2b MW |
516 | @<destructuring-lambda-list-item>^*) \\ \ind |
517 | @[[ @<declaration>^* @! @<doc-string> @]] \\ | |
518 | @<form>^* | |
519 | \-\nlret @<name>} | |
fcb6c0fb MW |
520 | \end{describe} |
521 | ||
522 | \begin{describe}{mac} | |
523 | {with-parser-context | |
020b9e2b MW |
524 | (@<context-class> @{ @<init-keyword> @<value> @}^*) \\ \ind |
525 | @<declaration>^* \\ | |
526 | @<form>^* | |
527 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
528 | \end{describe} |
529 | ||
530 | \begin{describe}{lmac} | |
531 | {parse @<parser> @> @<result> @<success-flag> @<consumed-flag>} | |
532 | \end{describe} | |
533 | ||
3f921e3f MW |
534 | \begin{describe}{mac} |
535 | {parser @<lambda-list> | |
536 | @[[ @<declaration>^* @! @<doc-string> @]] | |
537 | @<parser> | |
538 | @> @<function>} | |
539 | \end{describe} | |
540 | ||
fcb6c0fb MW |
541 | \begin{describe}{gf}{parser-at-eof-p @<context> @> @<form>} |
542 | \end{describe} | |
543 | ||
544 | \begin{describe}{gf}{parser-step @<context> @> @<form>} | |
545 | \end{describe} | |
546 | ||
fcb6c0fb MW |
547 | \begin{describe}{mac} |
548 | {if-parse (@[[ \=:result @<result-var> @! | |
020b9e2b MW |
549 | :expected @<expected-var> @! \+\\ |
550 | :consumedp @<consumed-var> @]]) \-\\ \ind\ind | |
551 | @<parser> \-\\ | |
552 | @<consequent> \\ | |
553 | @[@<alternatve>@] | |
554 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
555 | \end{describe} |
556 | ||
557 | \begin{describe}{mac} | |
020b9e2b MW |
558 | {when-parse (@[@<result-var>@]) @<parser> \\ \ind |
559 | @<form>^* | |
560 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
561 | \end{describe} |
562 | ||
563 | \begin{describe}{mac} | |
564 | {cond-parse (@[[ \=:result @<result-var> @! | |
020b9e2b MW |
565 | :expected @<expected-var> @! \+\\ |
566 | :consumedp @<consumed-var> @]]) \-\\ \ind | |
567 | @{ (@<parser> @<form>^*) @}^* | |
568 | \-\nlret @<value>^*} | |
fcb6c0fb MW |
569 | \end{describe} |
570 | ||
571 | \begin{describe}{parse}{:eof} | |
572 | \end{describe} | |
573 | ||
574 | \begin{describe}{parseform}{lisp @<form>^*} | |
575 | \end{describe} | |
576 | ||
577 | \begin{describe}{parseform}{label @<parser>} | |
578 | \end{describe} | |
579 | ||
580 | \begin{describe}{parse}{t} | |
581 | \end{describe} | |
582 | ||
583 | \begin{describe}{parseform}{t @<value>} | |
584 | \end{describe} | |
585 | ||
586 | \begin{describe}{parse}{nil} | |
587 | \end{describe} | |
588 | ||
589 | \begin{describe}{parseform}{nil @<indicator>} | |
590 | \end{describe} | |
591 | ||
592 | \begin{describe}{parseform}{when @<cond> @<parser>} | |
593 | \end{describe} | |
594 | ||
595 | \begin{describe}{parseform} | |
020b9e2b MW |
596 | {seq (@{ @<atomic-parser-spec> @! |
597 | (@[@<var>@] @<parser>) @}^*) \\ \ind | |
cd35a54e | 598 | @<form>^*} |
fcb6c0fb MW |
599 | \end{describe} |
600 | ||
601 | \begin{describe}{parseform}{and @<parser>^*} | |
602 | \end{describe} | |
603 | ||
604 | \begin{describe}{parseform}{or @<parser>^*} | |
605 | \end{describe} | |
606 | ||
607 | \begin{describe}{parseform}{? @<parser> @[@<default>@]} | |
608 | \end{describe} | |
609 | ||
610 | \begin{describe}{parseform} | |
020b9e2b MW |
611 | {many (\=@<accumulator-var> @<init-form> @<update-form> \+\\ |
612 | @[[ \=:new @<new-var> @! :final @<final-form> @! \+\\ | |
613 | :min @<minimum> @! :max @<maximum> @! \\ | |
614 | :commitp @<commitp> @]]) \-\-\\ \ind | |
fcb6c0fb MW |
615 | @<item-parser> @[@<sep-parser>@]} |
616 | \end{describe} | |
617 | ||
618 | \begin{describe}{parseform} | |
619 | {list (@[[ :min @<minimum> @! :max @<maximum> @! | |
020b9e2b | 620 | :commitp @<commitp> @]]) \\ \ind |
fcb6c0fb MW |
621 | @<item-parser> @[@<sep-parser>@]} |
622 | \end{describe} | |
623 | ||
624 | \begin{describe}{parseform} | |
625 | {skip-many (@[[ :min @<minimum> @! :max @<maximum> @! | |
020b9e2b | 626 | :commitp @<commitp> @]]) \\ \ind |
fcb6c0fb MW |
627 | @<item-parser> @[@<sep-parser>@]} |
628 | \end{describe} | |
629 | ||
630 | \begin{describe}{fun}{call-pluggable-parser @<symbol> \&rest @<args>} | |
631 | \end{describe} | |
632 | ||
633 | \begin{describe}{parseform}{plug @<symbol> @<arg>^*} | |
634 | \end{describe} | |
635 | ||
636 | \begin{describe}{fun} | |
637 | {pluggable-parser-add @<symbol> @<tag> @<parser-function>} | |
638 | \end{describe} | |
639 | ||
640 | \begin{describe}{mac} | |
cac85e0b MW |
641 | {define-pluggable-parser @<symbol> @<tag> @<lambda-list> |
642 | @[[ @<declaration>^* @! @<doc-string> @]] | |
643 | @<form>^*} | |
fcb6c0fb MW |
644 | \end{describe} |
645 | ||
646 | \begin{describe}{gf}{parser-capture-place @<context> @> @<form>} | |
647 | \end{describe} | |
648 | ||
649 | \begin{describe}{gf}{parser-restore-place @<context> @<place> @> @<form>} | |
650 | \end{describe} | |
651 | ||
652 | \begin{describe}{gf}{parser-release-place @<context> @<place> @> @<form>} | |
653 | \end{describe} | |
654 | ||
655 | \begin{describe}{gf} | |
46a4727d | 656 | {parser-places-must-be-released-p @<context> @> @<generalized-boolean>} |
fcb6c0fb MW |
657 | \end{describe} |
658 | ||
659 | \begin{describe}{mac} | |
cac85e0b MW |
660 | {with-parser-place (@<place-var> @<context>) |
661 | @[[ @<declaration>^* @! @<doc-string> @]] | |
662 | @<form>^*} | |
fcb6c0fb MW |
663 | \end{describe} |
664 | ||
665 | \begin{describe}{parseform}{peek @<parser>} | |
666 | \end{describe} | |
667 | ||
2b8759bf MW |
668 | \begin{describe}{parseform}{commit} |
669 | \end{describe} | |
670 | ||
fcb6c0fb MW |
671 | \begin{describe}{cls}{character-parser-context () \&key} |
672 | \end{describe} | |
673 | ||
674 | \begin{describe}{gf}{parser-current-char @<context> @> @<form>} | |
675 | \end{describe} | |
676 | ||
677 | \begin{describe}{parseform} | |
678 | {if-char (@[@<result-var>@]) @<condition> @<consequent> @<alternative>} | |
679 | \end{describe} | |
680 | ||
681 | \begin{describe}{parseform}{char @<character>} | |
682 | \end{describe} | |
683 | ||
34042b35 | 684 | \begin{describe}{parse}[char]{@<character>} |
fcb6c0fb MW |
685 | \end{describe} |
686 | ||
34042b35 | 687 | \begin{describe}{parse}[string]{@<string>} |
fcb6c0fb MW |
688 | \end{describe} |
689 | ||
690 | \begin{describe}{parse}{:any} | |
691 | \end{describe} | |
692 | ||
693 | \begin{describe}{parseform}{satisfies @<predicate>} | |
694 | \end{describe} | |
695 | ||
696 | \begin{describe}{parseform}{not @<character>} | |
697 | \end{describe} | |
698 | ||
699 | \begin{describe}{parseform}{filter @<predicate>} | |
700 | \end{describe} | |
701 | ||
702 | \begin{describe}{parse}{:whitespace} | |
703 | \end{describe} | |
704 | ||
705 | \begin{describe}{cls}{token-parser-context () \&key} | |
706 | \end{describe} | |
707 | ||
708 | \begin{describe}{gf}{parser-token-type @<context> @> @<form>} | |
709 | \end{describe} | |
710 | ||
711 | \begin{describe}{gf}{parser-token-value @<context> @> @<form>} | |
712 | \end{describe} | |
713 | ||
714 | \begin{describe}{parseform}{token @<type> @[@<value>@] @[:peekp @<peek>@]} | |
715 | \end{describe} | |
716 | ||
34042b35 | 717 | \begin{describe}{parse}[atom]{@<atom>} |
fcb6c0fb MW |
718 | \end{describe} |
719 | ||
fcb6c0fb MW |
720 | \begin{describe}{cls}{scanner-context () \&key :scanner} |
721 | \end{describe} | |
722 | ||
723 | \begin{describe}{gf}{parse-scanner @<context> @> @<symbol>} | |
724 | \end{describe} | |
725 | ||
726 | \begin{describe}{cls} | |
727 | {character-scanner-context (scanner-context character-parser-context) | |
728 | \&key :scanner} | |
729 | \end{describe} | |
730 | ||
731 | \begin{describe}{cls} | |
732 | {token-scanner-context (scanner-context token-parser-context) | |
733 | \&key :scanner} | |
734 | \end{describe} | |
735 | ||
2c7465ac MW |
736 | \begin{describe}{gf}{push-operator @<operator> @<state>} |
737 | \end{describe} | |
738 | ||
739 | \begin{describe}{gf}{push-value @<value> @<state>} | |
740 | \end{describe} | |
741 | ||
742 | \begin{describe}{gf}{apply-operator @<operator> @<state>} | |
743 | \end{describe} | |
744 | ||
745 | \begin{describe}{gf}{operator-push-action @<left> @<right>} | |
746 | \end{describe} | |
747 | ||
748 | \begin{describe}{parseform} | |
020b9e2b | 749 | {expr \=(@[[ :nestedp @<nestedp-var> @]]) \+\\ |
2c7465ac MW |
750 | @<operand-parser> @<binop-parser> |
751 | @<preop-parser> @<postop-parser>} | |
752 | \end{describe} | |
753 | ||
754 | \begin{describe}{gf}{operator-left-precedence @<operator> @> @<prec>} | |
755 | \end{describe} | |
756 | ||
757 | \begin{describe}{gf}{operator-right-precedence @<operator> @> @<prec>} | |
758 | \end{describe} | |
759 | ||
760 | \begin{describe}{gf}{operator-associativity @<operator> @> @<assoc>} | |
761 | \end{describe} | |
762 | ||
763 | \begin{describe}{cls}{prefix-operator () \&key} | |
764 | \end{describe} | |
765 | ||
766 | \begin{describe}{cls}{simple-operator () \&key :name :function} | |
767 | \end{describe} | |
768 | ||
769 | \begin{describe}{cls} | |
770 | {simple-unary-operator (simple-operator) \&key :name :function} | |
771 | \end{describe} | |
772 | ||
773 | \begin{describe*} | |
774 | {\quad\=\kill | |
020b9e2b MW |
775 | \dhead{cls}{simple-binary-operator (simple-operator) \\ \> |
776 | \&key :name :function | |
777 | :lprec :rprec :associativity} | |
2c7465ac MW |
778 | \dhead{cls}{simple-postfix-operator (simple-unary-operator) \\ \> |
779 | \&key :name :function :lprec :rprec} | |
780 | \dhead{cls}{simple-prefix-operator | |
020b9e2b | 781 | (prefix-operator simple-unary-operator) \\ \> |
2c7465ac MW |
782 | \&key :name :function :rprec}} |
783 | \end{describe*} | |
784 | ||
785 | \begin{describe*} | |
786 | {\dhead{mac}{preop @<name> (@<operand-var> @<lprec>) | |
cac85e0b | 787 | @<declaration>^* @<form>^* |
2c7465ac MW |
788 | @> @<prefix-operator>} |
789 | \dhead{mac}{postop @<name> | |
790 | (@<operand-var> @<lprec> @[[ :rprec @<rprec> @]]) | |
cac85e0b MW |
791 | @<declaration>^* @<form>^* |
792 | \nlret @<postfix-operator>} | |
2c7465ac | 793 | \dhead{mac}{binop @<name> (@<operand-var> @<lprec> @<rprec> @<assoc>) |
cac85e0b | 794 | @<declaration>^*@<form>^* |
2c7465ac MW |
795 | @> @<binary-operator>}} |
796 | \end{describe*} | |
797 | ||
798 | \begin{describe*} | |
799 | {\dhead{cls}{parenthesis () \&key :tag} | |
800 | \dhead{cls}{open-parenthesis (parenthesis prefix-operator) \&key :tag} | |
801 | \dhead{cls}{close-parenthesis (parenthesis) \&key :tag}} | |
802 | \end{describe*} | |
803 | ||
804 | \begin{describe*} | |
805 | {\dhead{fun}{lparen @<tag> @> @<open-paren>} | |
806 | \dhead{fun}{rparen @<tag> @> @<close-paren>}} | |
807 | \end{describe*} | |
fcb6c0fb MW |
808 | |
809 | %%%------------------------------------------------------------------------- | |
1f7d590d MW |
810 | \section{Lexical analyser} |
811 | ||
2c7465ac MW |
812 | \begin{describe}{cls} |
813 | {sod-token-scanner (token-scanner) | |
814 | \&key :filename (:line 1) (:column 0) :char-scanner} | |
815 | \end{describe} | |
816 | ||
817 | \begin{describe}{fun}{define-indicator @<indicator> @<description>} | |
818 | \end{describe} | |
819 | ||
40d95de7 MW |
820 | \begin{describe*} |
821 | {\dhead{cls}{lexer-error (parser-error base-lexer-error) \\ \ind | |
822 | \&key :expected :found :location \-} | |
823 | \dhead{cls}{syntax-error (parser-error base-syntax-error) \\ \ind | |
824 | \&key :expected :found :location \-}} | |
825 | \end{describe*} | |
826 | ||
d63df20a MW |
827 | \begin{describe}{fun} |
828 | {syntax-error @<scanner> @<expected> \&key :continuep :location} | |
2c7465ac MW |
829 | \end{describe} |
830 | ||
831 | \begin{describe}{fun} | |
d63df20a | 832 | {lexer-error @<char-scanner> @<expected> \&key :location} |
2c7465ac MW |
833 | \end{describe} |
834 | ||
835 | \begin{describe}{parseform} | |
836 | {skip-until (@[[ :keep-end @<keep-end-flag> @]]) @<token-type>^*} | |
837 | \end{describe} | |
838 | ||
5fa27d76 | 839 | \begin{describe}{parseform} |
450a4be6 | 840 | {error (@[[ :ignore-unconsumed @<flag> @! |
b5911ce8 MW |
841 | :force-process @<flag> @]]) \\ \ind\ind |
842 | @<sub-parser> @<recover-parser> \-\\ | |
843 | @<declaration>^* \\ | |
844 | @<form>^*} | |
2c7465ac MW |
845 | \end{describe} |
846 | ||
ae7a3c8f MW |
847 | \begin{describe}{parseform}{must @<sub-parser> @[@<default>@]} |
848 | \end{describe} | |
849 | ||
2c7465ac MW |
850 | \begin{describe}{fun} |
851 | {scan-comment @<char-scanner> | |
852 | @> @<result> @<success-flag> @<consumed-flag>} | |
853 | \end{describe} | |
854 | ||
1f7d590d MW |
855 | %%%----- That's all, folks -------------------------------------------------- |
856 | ||
857 | %%% Local variables: | |
858 | %%% mode: LaTeX | |
859 | %%% TeX-master: "sod.tex" | |
860 | %%% TeX-PDF-mode: t | |
861 | %%% End: |