Annotation of mandoc/mandoc.3, Revision 1.18
1.18 ! schwarze 1: .\" $Id: mandoc.3,v 1.17 2012/01/13 15:27:14 joerg Exp $
1.1 kristaps 2: .\"
3: .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4: .\" Copyright (c) 2010 Ingo Schwarze <schwarze@openbsd.org>
5: .\"
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10: .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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1.18 ! schwarze 18: .Dd $Mdocdate: January 13 2012 $
1.1 kristaps 19: .Dt MANDOC 3
20: .Os
21: .Sh NAME
22: .Nm mandoc ,
1.3 kristaps 23: .Nm mandoc_escape ,
1.1 kristaps 24: .Nm man_meta ,
1.14 kristaps 25: .Nm man_mparse ,
1.1 kristaps 26: .Nm man_node ,
1.6 kristaps 27: .Nm mchars_alloc ,
28: .Nm mchars_free ,
29: .Nm mchars_num2char ,
1.7 kristaps 30: .Nm mchars_num2uc ,
1.6 kristaps 31: .Nm mchars_spec2cp ,
32: .Nm mchars_spec2str ,
1.1 kristaps 33: .Nm mdoc_meta ,
34: .Nm mdoc_node ,
35: .Nm mparse_alloc ,
36: .Nm mparse_free ,
1.14 kristaps 37: .Nm mparse_getkeep ,
38: .Nm mparse_keep ,
1.1 kristaps 39: .Nm mparse_readfd ,
40: .Nm mparse_reset ,
1.2 kristaps 41: .Nm mparse_result ,
42: .Nm mparse_strerror ,
43: .Nm mparse_strlevel
1.1 kristaps 44: .Nd mandoc macro compiler library
1.8 kristaps 45: .Sh LIBRARY
46: .Lb mandoc
1.1 kristaps 47: .Sh SYNOPSIS
48: .In man.h
49: .In mdoc.h
50: .In mandoc.h
1.3 kristaps 51: .Ft "enum mandoc_esc"
52: .Fo mandoc_escape
1.15 kristaps 53: .Fa "const char **end"
54: .Fa "const char **start"
55: .Fa "int *sz"
1.3 kristaps 56: .Fc
1.1 kristaps 57: .Ft "const struct man_meta *"
58: .Fo man_meta
59: .Fa "const struct man *man"
60: .Fc
1.14 kristaps 61: .Ft "const struct mparse *"
62: .Fo man_mparse
63: .Fa "const struct man *man"
64: .Fc
1.1 kristaps 65: .Ft "const struct man_node *"
66: .Fo man_node
67: .Fa "const struct man *man"
68: .Fc
1.6 kristaps 69: .Ft "struct mchars *"
70: .Fn mchars_alloc
71: .Ft void
72: .Fn mchars_free "struct mchars *p"
73: .Ft char
74: .Fn mchars_num2char "const char *cp" "size_t sz"
1.7 kristaps 75: .Ft int
76: .Fn mchars_num2uc "const char *cp" "size_t sz"
1.6 kristaps 77: .Ft "const char *"
78: .Fo mchars_spec2str
1.16 kristaps 79: .Fa "const struct mchars *p"
1.6 kristaps 80: .Fa "const char *cp"
81: .Fa "size_t sz"
82: .Fa "size_t *rsz"
83: .Fc
84: .Ft int
85: .Fo mchars_spec2cp
1.16 kristaps 86: .Fa "const struct mchars *p"
1.6 kristaps 87: .Fa "const char *cp"
88: .Fa "size_t sz"
89: .Ft "const char *"
90: .Fc
1.1 kristaps 91: .Ft "const struct mdoc_meta *"
92: .Fo mdoc_meta
93: .Fa "const struct mdoc *mdoc"
94: .Fc
95: .Ft "const struct mdoc_node *"
96: .Fo mdoc_node
97: .Fa "const struct mdoc *mdoc"
98: .Fc
99: .Ft void
100: .Fo mparse_alloc
101: .Fa "enum mparset type"
102: .Fa "enum mandoclevel wlevel"
103: .Fa "mandocmsg msg"
104: .Fa "void *msgarg"
105: .Fc
106: .Ft void
107: .Fo mparse_free
108: .Fa "struct mparse *parse"
109: .Fc
1.14 kristaps 110: .Ft void
111: .Fo mparse_getkeep
112: .Fa "const struct mparse *parse"
113: .Fc
114: .Ft void
115: .Fo mparse_keep
116: .Fa "struct mparse *parse"
117: .Fc
1.1 kristaps 118: .Ft "enum mandoclevel"
119: .Fo mparse_readfd
120: .Fa "struct mparse *parse"
121: .Fa "int fd"
122: .Fa "const char *fname"
123: .Fc
124: .Ft void
125: .Fo mparse_reset
126: .Fa "struct mparse *parse"
127: .Fc
128: .Ft void
129: .Fo mparse_result
130: .Fa "struct mparse *parse"
131: .Fa "struct mdoc **mdoc"
132: .Fa "struct man **man"
1.2 kristaps 133: .Fc
134: .Ft "const char *"
135: .Fo mparse_strerror
136: .Fa "enum mandocerr"
137: .Fc
138: .Ft "const char *"
139: .Fo mparse_strlevel
140: .Fa "enum mandoclevel"
1.1 kristaps 141: .Fc
142: .Vt extern const char * const * man_macronames;
143: .Vt extern const char * const * mdoc_argnames;
144: .Vt extern const char * const * mdoc_macronames;
1.4 kristaps 145: .Fd "#define ASCII_NBRSP"
146: .Fd "#define ASCII_HYPH"
1.1 kristaps 147: .Sh DESCRIPTION
148: The
149: .Nm mandoc
150: library parses a
151: .Ux
152: manual into an abstract syntax tree (AST).
153: .Ux
154: manuals are composed of
155: .Xr mdoc 7
156: or
157: .Xr man 7 ,
158: and may be mixed with
159: .Xr roff 7 ,
160: .Xr tbl 7 ,
161: and
162: .Xr eqn 7
163: invocations.
164: .Pp
165: The following describes a general parse sequence:
166: .Bl -enum
167: .It
168: initiate a parsing sequence with
169: .Fn mparse_alloc ;
170: .It
171: parse files or file descriptors with
172: .Fn mparse_readfd ;
173: .It
174: retrieve a parsed syntax tree, if the parse was successful, with
175: .Fn mparse_result ;
176: .It
177: iterate over parse nodes with
178: .Fn mdoc_node
179: or
180: .Fn man_node ;
181: .It
182: free all allocated memory with
183: .Fn mparse_free ,
184: or invoke
185: .Fn mparse_reset
186: and parse new files.
1.3 kristaps 187: .El
1.6 kristaps 188: .Pp
189: The
190: .Nm
191: library also contains routines for translating character strings into glyphs
192: .Pq see Fn mchars_alloc
193: and parsing escape sequences from strings
194: .Pq see Fn mandoc_escape .
1.3 kristaps 195: .Sh REFERENCE
196: This section documents the functions, types, and variables available
197: via
198: .In mandoc.h .
199: .Ss Types
200: .Bl -ohang
201: .It Vt "enum mandoc_esc"
1.11 kristaps 202: An escape sequence classification.
1.3 kristaps 203: .It Vt "enum mandocerr"
1.11 kristaps 204: A fatal error, error, or warning message during parsing.
1.3 kristaps 205: .It Vt "enum mandoclevel"
1.11 kristaps 206: A classification of an
207: .Vt "enum mandoclevel"
208: as regards system operation.
1.6 kristaps 209: .It Vt "struct mchars"
210: An opaque pointer to an object allowing for translation between
211: character strings and glyphs.
212: See
213: .Fn mchars_alloc .
1.3 kristaps 214: .It Vt "enum mparset"
1.11 kristaps 215: The type of parser when reading input.
216: This should usually be
1.12 kristaps 217: .Dv MPARSE_AUTO
1.11 kristaps 218: for auto-detection.
1.3 kristaps 219: .It Vt "struct mparse"
1.11 kristaps 220: An opaque pointer to a running parse sequence.
221: Created with
222: .Fn mparse_alloc
223: and freed with
224: .Fn mparse_free .
225: This may be used across parsed input if
226: .Fn mparse_reset
227: is called between parses.
1.3 kristaps 228: .It Vt "mandocmsg"
1.11 kristaps 229: A prototype for a function to handle fatal error, error, and warning
230: messages emitted by the parser.
1.3 kristaps 231: .El
232: .Ss Functions
233: .Bl -ohang
234: .It Fn mandoc_escape
1.4 kristaps 235: Scan an escape sequence, i.e., a character string beginning with
236: .Sq \e .
1.17 joerg 237: Pass a pointer to the character after the
238: .Sq \e
239: as
1.4 kristaps 240: .Va end ;
241: it will be set to the supremum of the parsed escape sequence unless
1.12 kristaps 242: returning
243: .Dv ESCAPE_ERROR ,
244: in which case the string is bogus and should be
1.4 kristaps 245: thrown away.
1.12 kristaps 246: If not
247: .Dv ESCAPE_ERROR
248: or
249: .Dv ESCAPE_IGNORE ,
1.4 kristaps 250: .Va start
251: is set to the first relevant character of the substring (font, glyph,
252: whatever) of length
253: .Va sz .
254: Both
255: .Va start
256: and
257: .Va sz
1.12 kristaps 258: may be
259: .Dv NULL .
1.18 ! schwarze 260: Declared in
! 261: .In mandoc.h ,
! 262: implemented in
! 263: .Pa mandoc.c .
1.3 kristaps 264: .It Fn man_meta
1.4 kristaps 265: Obtain the meta-data of a successful parse.
266: This may only be used on a pointer returned by
267: .Fn mparse_result .
1.18 ! schwarze 268: Declared in
! 269: .In man.h ,
! 270: implemented in
! 271: .Pa man.c .
1.14 kristaps 272: .It Fn man_mparse
273: Get the parser used for the current output.
1.18 ! schwarze 274: Declared in
! 275: .In man.h ,
! 276: implemented in
! 277: .Pa man.c .
1.3 kristaps 278: .It Fn man_node
1.4 kristaps 279: Obtain the root node of a successful parse.
280: This may only be used on a pointer returned by
281: .Fn mparse_result .
1.18 ! schwarze 282: Declared in
! 283: .In man.h ,
! 284: implemented in
! 285: .Pa man.c .
1.6 kristaps 286: .It Fn mchars_alloc
287: Allocate an
288: .Vt "struct mchars *"
289: object for translating special characters into glyphs.
290: See
291: .Xr mandoc_char 7
292: for an overview of special characters.
293: The object must be freed with
294: .Fn mchars_free .
1.18 ! schwarze 295: Declared in
! 296: .In mandoc.h ,
! 297: implemented in
! 298: .Pa chars.c .
1.6 kristaps 299: .It Fn mchars_free
300: Free an object created with
301: .Fn mchars_alloc .
1.18 ! schwarze 302: Declared in
! 303: .In mandoc.h ,
! 304: implemented in
! 305: .Pa chars.c .
1.6 kristaps 306: .It Fn mchars_num2char
1.7 kristaps 307: Convert a character index (e.g., the \eN\(aq\(aq escape) into a
308: printable ASCII character.
309: Returns \e0 (the nil character) if the input sequence is malformed.
1.18 ! schwarze 310: Declared in
! 311: .In mandoc.h ,
! 312: implemented in
! 313: .Pa chars.c .
1.7 kristaps 314: .It Fn mchars_num2uc
315: Convert a hexadecimal character index (e.g., the \e[uNNNN] escape) into
316: a Unicode codepoint.
1.6 kristaps 317: Returns \e0 (the nil character) if the input sequence is malformed.
1.18 ! schwarze 318: Declared in
! 319: .In mandoc.h ,
! 320: implemented in
! 321: .Pa chars.c .
1.6 kristaps 322: .It Fn mchars_spec2cp
323: Convert a special character into a valid Unicode codepoint.
1.10 kristaps 324: Returns \-1 on failure or a non-zero Unicode codepoint on success.
1.18 ! schwarze 325: Declared in
! 326: .In mandoc.h ,
! 327: implemented in
! 328: .Pa chars.c .
1.6 kristaps 329: .It Fn mchars_spec2str
330: Convert a special character into an ASCII string.
1.12 kristaps 331: Returns
332: .Dv NULL
333: on failure.
1.18 ! schwarze 334: Declared in
! 335: .In mandoc.h ,
! 336: implemented in
! 337: .Pa chars.c .
1.3 kristaps 338: .It Fn mdoc_meta
1.4 kristaps 339: Obtain the meta-data of a successful parse.
340: This may only be used on a pointer returned by
341: .Fn mparse_result .
1.18 ! schwarze 342: Declared in
! 343: .In mdoc.h ,
! 344: implemented in
! 345: .Pa mdoc.c .
1.3 kristaps 346: .It Fn mdoc_node
1.4 kristaps 347: Obtain the root node of a successful parse.
348: This may only be used on a pointer returned by
349: .Fn mparse_result .
1.18 ! schwarze 350: Declared in
! 351: .In mdoc.h ,
! 352: implemented in
! 353: .Pa mdoc.c .
1.3 kristaps 354: .It Fn mparse_alloc
1.4 kristaps 355: Allocate a parser.
356: The same parser may be used for multiple files so long as
357: .Fn mparse_reset
358: is called between parses.
359: .Fn mparse_free
360: must be called to free the memory allocated by this function.
1.18 ! schwarze 361: Declared in
! 362: .In mandoc.h ,
! 363: implemented in
! 364: .Pa read.c .
1.3 kristaps 365: .It Fn mparse_free
1.4 kristaps 366: Free all memory allocated by
367: .Fn mparse_alloc .
1.18 ! schwarze 368: Declared in
! 369: .In mandoc.h ,
! 370: implemented in
! 371: .Pa read.c .
1.14 kristaps 372: .It Fn mparse_getkeep
373: Acquire the keep buffer.
374: Must follow a call of
375: .Fn mparse_keep .
1.18 ! schwarze 376: Declared in
! 377: .In mandoc.h ,
! 378: implemented in
! 379: .Pa read.c .
1.14 kristaps 380: .It Fn mparse_keep
381: Instruct the parser to retain a copy of its parsed input.
382: This can be acquired with subsequent
383: .Fn mparse_getkeep
384: calls.
1.18 ! schwarze 385: Declared in
! 386: .In mandoc.h ,
! 387: implemented in
! 388: .Pa read.c .
1.3 kristaps 389: .It Fn mparse_readfd
1.4 kristaps 390: Parse a file or file descriptor.
391: If
392: .Va fd
393: is -1,
394: .Va fname
395: is opened for reading.
396: Otherwise,
397: .Va fname
398: is assumed to be the name associated with
399: .Va fd .
400: This may be called multiple times with different parameters; however,
401: .Fn mparse_reset
402: should be invoked between parses.
1.18 ! schwarze 403: Declared in
! 404: .In mandoc.h ,
! 405: implemented in
! 406: .Pa read.c .
1.3 kristaps 407: .It Fn mparse_reset
1.4 kristaps 408: Reset a parser so that
409: .Fn mparse_readfd
410: may be used again.
1.18 ! schwarze 411: Declared in
! 412: .In mandoc.h ,
! 413: implemented in
! 414: .Pa read.c .
1.3 kristaps 415: .It Fn mparse_result
1.4 kristaps 416: Obtain the result of a parse.
417: Only successful parses
418: .Po
419: i.e., those where
420: .Fn mparse_readfd
421: returned less than MANDOCLEVEL_FATAL
422: .Pc
423: should invoke this function, in which case one of the two pointers will
424: be filled in.
1.18 ! schwarze 425: Declared in
! 426: .In mandoc.h ,
! 427: implemented in
! 428: .Pa read.c .
1.3 kristaps 429: .It Fn mparse_strerror
1.4 kristaps 430: Return a statically-allocated string representation of an error code.
1.18 ! schwarze 431: Declared in
! 432: .In mandoc.h ,
! 433: implemented in
! 434: .Pa read.c .
1.3 kristaps 435: .It Fn mparse_strlevel
1.4 kristaps 436: Return a statically-allocated string representation of a level code.
1.18 ! schwarze 437: Declared in
! 438: .In mandoc.h ,
! 439: implemented in
! 440: .Pa read.c .
1.3 kristaps 441: .El
442: .Ss Variables
443: .Bl -ohang
444: .It Va man_macronames
1.4 kristaps 445: The string representation of a man macro as indexed by
446: .Vt "enum mant" .
1.3 kristaps 447: .It Va mdoc_argnames
1.4 kristaps 448: The string representation of a mdoc macro argument as indexed by
449: .Vt "enum mdocargt" .
1.3 kristaps 450: .It Va mdoc_macronames
1.4 kristaps 451: The string representation of a mdoc macro as indexed by
452: .Vt "enum mdoct" .
1.1 kristaps 453: .El
454: .Sh IMPLEMENTATION NOTES
455: This section consists of structural documentation for
456: .Xr mdoc 7
457: and
458: .Xr man 7
1.11 kristaps 459: syntax trees and strings.
460: .Ss Man and Mdoc Strings
461: Strings may be extracted from mdoc and man meta-data, or from text
462: nodes (MDOC_TEXT and MAN_TEXT, respectively).
463: These strings have special non-printing formatting cues embedded in the
464: text itself, as well as
465: .Xr roff 7
466: escapes preserved from input.
467: Implementing systems will need to handle both situations to produce
468: human-readable text.
469: In general, strings may be assumed to consist of 7-bit ASCII characters.
470: .Pp
471: The following non-printing characters may be embedded in text strings:
472: .Bl -tag -width Ds
473: .It Dv ASCII_NBRSP
474: A non-breaking space character.
475: .It Dv ASCII_HYPH
476: A soft hyphen.
477: .El
478: .Pp
479: Escape characters are also passed verbatim into text strings.
480: An escape character is a sequence of characters beginning with the
481: backslash
482: .Pq Sq \e .
483: To construct human-readable text, these should be intercepted with
484: .Fn mandoc_escape
485: and converted with one of
486: .Fn mchars_num2char ,
487: .Fn mchars_spec2str ,
488: and so on.
1.1 kristaps 489: .Ss Man Abstract Syntax Tree
490: This AST is governed by the ontological rules dictated in
491: .Xr man 7
492: and derives its terminology accordingly.
493: .Pp
494: The AST is composed of
495: .Vt struct man_node
496: nodes with element, root and text types as declared by the
497: .Va type
498: field.
499: Each node also provides its parse point (the
500: .Va line ,
501: .Va sec ,
502: and
503: .Va pos
504: fields), its position in the tree (the
505: .Va parent ,
506: .Va child ,
507: .Va next
508: and
509: .Va prev
510: fields) and some type-specific data.
511: .Pp
512: The tree itself is arranged according to the following normal form,
513: where capitalised non-terminals represent nodes.
514: .Pp
515: .Bl -tag -width "ELEMENTXX" -compact
516: .It ROOT
517: \(<- mnode+
518: .It mnode
519: \(<- ELEMENT | TEXT | BLOCK
520: .It BLOCK
521: \(<- HEAD BODY
522: .It HEAD
523: \(<- mnode*
524: .It BODY
525: \(<- mnode*
526: .It ELEMENT
527: \(<- ELEMENT | TEXT*
528: .It TEXT
1.11 kristaps 529: \(<- [[:ascii:]]*
1.1 kristaps 530: .El
531: .Pp
532: The only elements capable of nesting other elements are those with
533: next-lint scope as documented in
534: .Xr man 7 .
535: .Ss Mdoc Abstract Syntax Tree
536: This AST is governed by the ontological
537: rules dictated in
538: .Xr mdoc 7
539: and derives its terminology accordingly.
540: .Qq In-line
541: elements described in
542: .Xr mdoc 7
543: are described simply as
544: .Qq elements .
545: .Pp
546: The AST is composed of
547: .Vt struct mdoc_node
548: nodes with block, head, body, element, root and text types as declared
549: by the
550: .Va type
551: field.
552: Each node also provides its parse point (the
553: .Va line ,
554: .Va sec ,
555: and
556: .Va pos
557: fields), its position in the tree (the
558: .Va parent ,
559: .Va child ,
560: .Va nchild ,
561: .Va next
562: and
563: .Va prev
564: fields) and some type-specific data, in particular, for nodes generated
565: from macros, the generating macro in the
566: .Va tok
567: field.
568: .Pp
569: The tree itself is arranged according to the following normal form,
570: where capitalised non-terminals represent nodes.
571: .Pp
572: .Bl -tag -width "ELEMENTXX" -compact
573: .It ROOT
574: \(<- mnode+
575: .It mnode
576: \(<- BLOCK | ELEMENT | TEXT
577: .It BLOCK
578: \(<- HEAD [TEXT] (BODY [TEXT])+ [TAIL [TEXT]]
579: .It ELEMENT
580: \(<- TEXT*
581: .It HEAD
582: \(<- mnode*
583: .It BODY
584: \(<- mnode* [ENDBODY mnode*]
585: .It TAIL
586: \(<- mnode*
587: .It TEXT
1.11 kristaps 588: \(<- [[:ascii:]]*
1.1 kristaps 589: .El
590: .Pp
591: Of note are the TEXT nodes following the HEAD, BODY and TAIL nodes of
592: the BLOCK production: these refer to punctuation marks.
593: Furthermore, although a TEXT node will generally have a non-zero-length
594: string, in the specific case of
595: .Sq \&.Bd \-literal ,
596: an empty line will produce a zero-length string.
597: Multiple body parts are only found in invocations of
598: .Sq \&Bl \-column ,
599: where a new body introduces a new phrase.
600: .Pp
601: The
602: .Xr mdoc 7
1.5 kristaps 603: syntax tree accommodates for broken block structures as well.
1.1 kristaps 604: The ENDBODY node is available to end the formatting associated
605: with a given block before the physical end of that block.
606: It has a non-null
607: .Va end
608: field, is of the BODY
609: .Va type ,
610: has the same
611: .Va tok
612: as the BLOCK it is ending, and has a
613: .Va pending
614: field pointing to that BLOCK's BODY node.
615: It is an indirect child of that BODY node
616: and has no children of its own.
617: .Pp
618: An ENDBODY node is generated when a block ends while one of its child
619: blocks is still open, like in the following example:
620: .Bd -literal -offset indent
621: \&.Ao ao
622: \&.Bo bo ac
623: \&.Ac bc
624: \&.Bc end
625: .Ed
626: .Pp
627: This example results in the following block structure:
628: .Bd -literal -offset indent
629: BLOCK Ao
630: HEAD Ao
631: BODY Ao
632: TEXT ao
633: BLOCK Bo, pending -> Ao
634: HEAD Bo
635: BODY Bo
636: TEXT bo
637: TEXT ac
638: ENDBODY Ao, pending -> Ao
639: TEXT bc
640: TEXT end
641: .Ed
642: .Pp
643: Here, the formatting of the
644: .Sq \&Ao
645: block extends from TEXT ao to TEXT ac,
646: while the formatting of the
647: .Sq \&Bo
648: block extends from TEXT bo to TEXT bc.
649: It renders as follows in
650: .Fl T Ns Cm ascii
651: mode:
652: .Pp
653: .Dl <ao [bo ac> bc] end
654: .Pp
655: Support for badly-nested blocks is only provided for backward
656: compatibility with some older
657: .Xr mdoc 7
658: implementations.
659: Using badly-nested blocks is
660: .Em strongly discouraged ;
661: for example, the
662: .Fl T Ns Cm html
663: and
664: .Fl T Ns Cm xhtml
665: front-ends to
666: .Xr mandoc 1
667: are unable to render them in any meaningful way.
668: Furthermore, behaviour when encountering badly-nested blocks is not
669: consistent across troff implementations, especially when using multiple
670: levels of badly-nested blocks.
671: .Sh SEE ALSO
672: .Xr mandoc 1 ,
673: .Xr eqn 7 ,
674: .Xr man 7 ,
1.6 kristaps 675: .Xr mandoc_char 7 ,
1.1 kristaps 676: .Xr mdoc 7 ,
677: .Xr roff 7 ,
678: .Xr tbl 7
679: .Sh AUTHORS
680: The
681: .Nm
682: library was written by
1.13 kristaps 683: .An Kristaps Dzonsons ,
684: .Mt kristaps@bsd.lv .
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