1 .\" $Id: man.3,v 1.13 2010/03/27 10:04:56 kristaps Exp $
3 .\" Copyright (c) 2009-2010 Kristaps Dzonsons <kristaps@bsd.lv>
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31 .Nd man macro compiler library
36 .Vt extern const char * const * man_macronames;
38 .Fn man_alloc "void *data" "int pflags" "const struct man_cb *cb"
40 .Fn man_reset "struct man *man"
42 .Fn man_free "struct man *man"
44 .Fn man_parseln "struct man *man" "int line" "char *buf"
45 .Ft "const struct man_node *"
46 .Fn man_node "const struct man *man"
47 .Ft "const struct man_meta *"
48 .Fn man_meta "const struct man *man"
50 .Fn man_endparse "struct man *man"
56 library parses lines of
60 man) into an abstract syntax tree (AST).
63 In general, applications initiate a parsing sequence with
65 parse each line in a document with
67 close the parsing session with
69 operate over the syntax tree returned by
73 then free all allocated memory with
77 function may be used in order to reset the parser for another input
80 section for a full example.
83 Beyond the full set of macros defined in
87 library also accepts the following macros:
90 .Bl -tag -width Ds -compact
96 Instructional macros in the original roff language. Blocks begun by
99 and may begin anywhere, although they may not break the next-line
100 scoping rules specified in
102 These blocks are discarded.
105 Has no effect. Handled as a current-scope line macro.
110 .Pq part of the standard preamble for Perl documentation .
111 Handled as a line macro.
114 Has no effect. Handled as a current-scope line macro.
119 .Pq part of the standard preamble for Perl documentation .
120 Handled as a current-scope line macro.
127 .Pq part of the standard preamble for Perl documentation .
128 Handled as a current-scope line macro.
133 This section further defines the
138 available to programmers. Following that, the
139 .Sx Abstract Syntax Tree
140 section documents the output tree.
148 may use the following types:
152 An opaque type defined in
154 Its values are only used privately within the library.
157 A set of message callbacks defined in
160 .It Vt struct man_node
161 A parsed node. Defined in
164 .Sx Abstract Syntax Tree
170 Function descriptions follow:
174 Allocates a parsing structure. The
176 pointer is passed to callbacks in
178 which are documented further in the header file.
181 arguments are defined in
183 Returns NULL on failure. If non-NULL, the pointer must be freed with
187 Reset the parser for another parse routine. After its use,
189 behaves as if invoked for the first time.
192 Free all resources of a parser. The pointer is no longer valid after
196 Parse a nil-terminated line of input. This line should not contain the
197 trailing newline. Returns 0 on failure, 1 on success. The input buffer
199 is modified by this function.
202 Signals that the parse is complete. Note that if
204 is called subsequent to
206 the resulting tree is incomplete. Returns 0 on failure, 1 on success.
209 Returns the first node of the parse. Note that if
213 return 0, the tree will be incomplete.
215 Returns the document's parsed meta-data. If this information has not
220 return 0, the data will be incomplete.
225 The following variables are also defined:
228 .It Va man_macronames
229 An array of string-ified token names.
233 .Ss Abstract Syntax Tree
236 functions produce an abstract syntax tree (AST) describing input in a
237 regular form. It may be reviewed at any time with
239 however, if called before
245 fail, it may be incomplete.
248 This AST is governed by the ontological
251 and derives its terminology accordingly.
254 The AST is composed of
256 nodes with element, root and text types as declared
259 field. Each node also provides its parse point (the
264 fields), its position in the tree (the
270 fields) and some type-specific data.
273 The tree itself is arranged according to the following normal form,
274 where capitalised non-terminals represent nodes.
276 .Bl -tag -width "ELEMENTXX" -compact
280 \(<- ELEMENT | TEXT | BLOCK
294 The only elements capable of nesting other elements are those with
295 next-lint scope as documented in
300 The following example reads lines from stdin and parses them, operating
301 on the finished parse tree with
303 This example does not error-check nor free memory upon failure.
304 .Bd -literal -offset indent
306 struct man_node *node;
312 man = man_alloc(NULL, 0, NULL);
316 while ((len = getline(&buf, &alloc_len, stdin)) >= 0) {
317 if (len && buflen[len - 1] = '\en')
318 buf[len - 1] = '\e0';
319 if ( ! man_parseln(man, line, buf))
320 errx(1, "man_parseln");
326 if ( ! man_endparse(man))
327 errx(1, "man_endparse");
328 if (NULL == (node = man_node(man)))
344 utility was written by
345 .An Kristaps Dzonsons Aq kristaps@bsd.lv .