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version 1.5, 2011/04/30 10:18:24 version 1.20, 2013/09/16 22:54:38
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 .Nm mandoc ,  .Nm mandoc ,
 .Nm mandoc_escape ,  .Nm mandoc_escape ,
 .Nm man_meta ,  .Nm man_meta ,
   .Nm man_mparse ,
 .Nm man_node ,  .Nm man_node ,
   .Nm mchars_alloc ,
   .Nm mchars_free ,
   .Nm mchars_num2char ,
   .Nm mchars_num2uc ,
   .Nm mchars_spec2cp ,
   .Nm mchars_spec2str ,
 .Nm mdoc_meta ,  .Nm mdoc_meta ,
 .Nm mdoc_node ,  .Nm mdoc_node ,
 .Nm mparse_alloc ,  .Nm mparse_alloc ,
 .Nm mparse_free ,  .Nm mparse_free ,
   .Nm mparse_getkeep ,
   .Nm mparse_keep ,
 .Nm mparse_readfd ,  .Nm mparse_readfd ,
 .Nm mparse_reset ,  .Nm mparse_reset ,
 .Nm mparse_result ,  .Nm mparse_result ,
 .Nm mparse_strerror ,  .Nm mparse_strerror ,
 .Nm mparse_strlevel  .Nm mparse_strlevel
 .Nd mandoc macro compiler library  .Nd mandoc macro compiler library
   .Sh LIBRARY
   .Lb mandoc
 .Sh SYNOPSIS  .Sh SYNOPSIS
 .In man.h  .In man.h
 .In mdoc.h  .In mdoc.h
 .In mandoc.h  .In mandoc.h
 .Ft "enum mandoc_esc"  .Ft "enum mandoc_esc"
 .Fo mandoc_escape  .Fo mandoc_escape
 .Fa "const char **in"  .Fa "const char **end"
 .Fa "const char **seq"  .Fa "const char **start"
 .Fa "int *len"  .Fa "int *sz"
 .Fc  .Fc
 .Ft "const struct man_meta *"  .Ft "const struct man_meta *"
 .Fo man_meta  .Fo man_meta
 .Fa "const struct man *man"  .Fa "const struct man *man"
 .Fc  .Fc
   .Ft "const struct mparse *"
   .Fo man_mparse
   .Fa "const struct man *man"
   .Fc
 .Ft "const struct man_node *"  .Ft "const struct man_node *"
 .Fo man_node  .Fo man_node
 .Fa "const struct man *man"  .Fa "const struct man *man"
 .Fc  .Fc
   .Ft "struct mchars *"
   .Fn mchars_alloc "void"
   .Ft void
   .Fn mchars_free "struct mchars *p"
   .Ft char
   .Fn mchars_num2char "const char *cp" "size_t sz"
   .Ft int
   .Fn mchars_num2uc "const char *cp" "size_t sz"
   .Ft "const char *"
   .Fo mchars_spec2str
   .Fa "const struct mchars *p"
   .Fa "const char *cp"
   .Fa "size_t sz"
   .Fa "size_t *rsz"
   .Fc
   .Ft int
   .Fo mchars_spec2cp
   .Fa "const struct mchars *p"
   .Fa "const char *cp"
   .Fa "size_t sz"
   .Fc
 .Ft "const struct mdoc_meta *"  .Ft "const struct mdoc_meta *"
 .Fo mdoc_meta  .Fo mdoc_meta
 .Fa "const struct mdoc *mdoc"  .Fa "const struct mdoc *mdoc"
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Line 106 
 .Fo mparse_free  .Fo mparse_free
 .Fa "struct mparse *parse"  .Fa "struct mparse *parse"
 .Fc  .Fc
   .Ft void
   .Fo mparse_getkeep
   .Fa "const struct mparse *parse"
   .Fc
   .Ft void
   .Fo mparse_keep
   .Fa "struct mparse *parse"
   .Fc
 .Ft "enum mandoclevel"  .Ft "enum mandoclevel"
 .Fo mparse_readfd  .Fo mparse_readfd
 .Fa "struct mparse *parse"  .Fa "struct mparse *parse"
Line 140  or invoke
Line 184  or invoke
 .Fn mparse_reset  .Fn mparse_reset
 and parse new files.  and parse new files.
 .El  .El
   .Pp
   The
   .Nm
   library also contains routines for translating character strings into glyphs
   .Pq see Fn mchars_alloc
   and parsing escape sequences from strings
   .Pq see Fn mandoc_escape .
 .Sh REFERENCE  .Sh REFERENCE
 This section documents the functions, types, and variables available  This section documents the functions, types, and variables available
 via  via
Line 147  via
Line 198  via
 .Ss Types  .Ss Types
 .Bl -ohang  .Bl -ohang
 .It Vt "enum mandoc_esc"  .It Vt "enum mandoc_esc"
   An escape sequence classification.
 .It Vt "enum mandocerr"  .It Vt "enum mandocerr"
   A fatal error, error, or warning message during parsing.
 .It Vt "enum mandoclevel"  .It Vt "enum mandoclevel"
   A classification of an
   .Vt "enum mandoclevel"
   as regards system operation.
   .It Vt "struct mchars"
   An opaque pointer to an object allowing for translation between
   character strings and glyphs.
   See
   .Fn mchars_alloc .
 .It Vt "enum mparset"  .It Vt "enum mparset"
   The type of parser when reading input.
   This should usually be
   .Dv MPARSE_AUTO
   for auto-detection.
 .It Vt "struct mparse"  .It Vt "struct mparse"
   An opaque pointer to a running parse sequence.
   Created with
   .Fn mparse_alloc
   and freed with
   .Fn mparse_free .
   This may be used across parsed input if
   .Fn mparse_reset
   is called between parses.
 .It Vt "mandocmsg"  .It Vt "mandocmsg"
   A prototype for a function to handle fatal error, error, and warning
   messages emitted by the parser.
 .El  .El
 .Ss Functions  .Ss Functions
 .Bl -ohang  .Bl -ohang
 .It Fn mandoc_escape  .It Fn mandoc_escape
 Scan an escape sequence, i.e., a character string beginning with  Scan an escape sequence, i.e., a character string beginning with
 .Sq \e .  .Sq \e .
 Pass a pointer to this string as  Pass a pointer to the character after the
   .Sq \e
   as
 .Va end ;  .Va end ;
 it will be set to the supremum of the parsed escape sequence unless  it will be set to the supremum of the parsed escape sequence unless
 returning ESCAPE_ERROR, in which case the string is bogus and should be  returning
   .Dv ESCAPE_ERROR ,
   in which case the string is bogus and should be
 thrown away.  thrown away.
 If not ESCAPE_ERROR or ESCAPE_IGNORE,  If not
   .Dv ESCAPE_ERROR
   or
   .Dv ESCAPE_IGNORE ,
 .Va start  .Va start
 is set to the first relevant character of the substring (font, glyph,  is set to the first relevant character of the substring (font, glyph,
 whatever) of length  whatever) of length
Line 172  Both
Line 254  Both
 .Va start  .Va start
 and  and
 .Va sz  .Va sz
 may be NULL.  may be
   .Dv NULL .
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa mandoc.c .
 .It Fn man_meta  .It Fn man_meta
 Obtain the meta-data of a successful parse.  Obtain the meta-data of a successful parse.
 This may only be used on a pointer returned by  This may only be used on a pointer returned by
 .Fn mparse_result .  .Fn mparse_result .
   Declared in
   .In man.h ,
   implemented in
   .Pa man.c .
   .It Fn man_mparse
   Get the parser used for the current output.
   Declared in
   .In man.h ,
   implemented in
   .Pa man.c .
 .It Fn man_node  .It Fn man_node
 Obtain the root node of a successful parse.  Obtain the root node of a successful parse.
 This may only be used on a pointer returned by  This may only be used on a pointer returned by
 .Fn mparse_result .  .Fn mparse_result .
   Declared in
   .In man.h ,
   implemented in
   .Pa man.c .
   .It Fn mchars_alloc
   Allocate an
   .Vt "struct mchars *"
   object for translating special characters into glyphs.
   See
   .Xr mandoc_char 7
   for an overview of special characters.
   The object must be freed with
   .Fn mchars_free .
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa chars.c .
   .It Fn mchars_free
   Free an object created with
   .Fn mchars_alloc .
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa chars.c .
   .It Fn mchars_num2char
   Convert a character index (e.g., the \eN\(aq\(aq escape) into a
   printable ASCII character.
   Returns \e0 (the nil character) if the input sequence is malformed.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa chars.c .
   .It Fn mchars_num2uc
   Convert a hexadecimal character index (e.g., the \e[uNNNN] escape) into
   a Unicode codepoint.
   Returns \e0 (the nil character) if the input sequence is malformed.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa chars.c .
   .It Fn mchars_spec2cp
   Convert a special character into a valid Unicode codepoint.
   Returns \-1 on failure or a non-zero Unicode codepoint on success.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa chars.c .
   .It Fn mchars_spec2str
   Convert a special character into an ASCII string.
   Returns
   .Dv NULL
   on failure.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa chars.c .
 .It Fn mdoc_meta  .It Fn mdoc_meta
 Obtain the meta-data of a successful parse.  Obtain the meta-data of a successful parse.
 This may only be used on a pointer returned by  This may only be used on a pointer returned by
 .Fn mparse_result .  .Fn mparse_result .
   Declared in
   .In mdoc.h ,
   implemented in
   .Pa mdoc.c .
 .It Fn mdoc_node  .It Fn mdoc_node
 Obtain the root node of a successful parse.  Obtain the root node of a successful parse.
 This may only be used on a pointer returned by  This may only be used on a pointer returned by
 .Fn mparse_result .  .Fn mparse_result .
   Declared in
   .In mdoc.h ,
   implemented in
   .Pa mdoc.c .
 .It Fn mparse_alloc  .It Fn mparse_alloc
 Allocate a parser.  Allocate a parser.
 The same parser may be used for multiple files so long as  The same parser may be used for multiple files so long as
Line 196  The same parser may be used for multiple files so long
Line 357  The same parser may be used for multiple files so long
 is called between parses.  is called between parses.
 .Fn mparse_free  .Fn mparse_free
 must be called to free the memory allocated by this function.  must be called to free the memory allocated by this function.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
 .It Fn mparse_free  .It Fn mparse_free
 Free all memory allocated by  Free all memory allocated by
 .Fn mparse_alloc .  .Fn mparse_alloc .
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
   .It Fn mparse_getkeep
   Acquire the keep buffer.
   Must follow a call of
   .Fn mparse_keep .
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
   .It Fn mparse_keep
   Instruct the parser to retain a copy of its parsed input.
   This can be acquired with subsequent
   .Fn mparse_getkeep
   calls.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
 .It Fn mparse_readfd  .It Fn mparse_readfd
 Parse a file or file descriptor.  Parse a file or file descriptor.
 If  If
Line 213  is assumed to be the name associated with
Line 399  is assumed to be the name associated with
 This may be called multiple times with different parameters; however,  This may be called multiple times with different parameters; however,
 .Fn mparse_reset  .Fn mparse_reset
 should be invoked between parses.  should be invoked between parses.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
 .It Fn mparse_reset  .It Fn mparse_reset
 Reset a parser so that  Reset a parser so that
 .Fn mparse_readfd  .Fn mparse_readfd
 may be used again.  may be used again.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
 .It Fn mparse_result  .It Fn mparse_result
 Obtain the result of a parse.  Obtain the result of a parse.
 Only successful parses  Only successful parses
Line 227  returned less than MANDOCLEVEL_FATAL
Line 421  returned less than MANDOCLEVEL_FATAL
 .Pc  .Pc
 should invoke this function, in which case one of the two pointers will  should invoke this function, in which case one of the two pointers will
 be filled in.  be filled in.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
 .It Fn mparse_strerror  .It Fn mparse_strerror
 Return a statically-allocated string representation of an error code.  Return a statically-allocated string representation of an error code.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
 .It Fn mparse_strlevel  .It Fn mparse_strlevel
 Return a statically-allocated string representation of a level code.  Return a statically-allocated string representation of a level code.
   Declared in
   .In mandoc.h ,
   implemented in
   .Pa read.c .
 .El  .El
 .Ss Variables  .Ss Variables
 .Bl -ohang  .Bl -ohang
Line 249  This section consists of structural documentation for
Line 455  This section consists of structural documentation for
 .Xr mdoc 7  .Xr mdoc 7
 and  and
 .Xr man 7  .Xr man 7
 syntax trees.  syntax trees and strings.
   .Ss Man and Mdoc Strings
   Strings may be extracted from mdoc and man meta-data, or from text
   nodes (MDOC_TEXT and MAN_TEXT, respectively).
   These strings have special non-printing formatting cues embedded in the
   text itself, as well as
   .Xr roff 7
   escapes preserved from input.
   Implementing systems will need to handle both situations to produce
   human-readable text.
   In general, strings may be assumed to consist of 7-bit ASCII characters.
   .Pp
   The following non-printing characters may be embedded in text strings:
   .Bl -tag -width Ds
   .It Dv ASCII_NBRSP
   A non-breaking space character.
   .It Dv ASCII_HYPH
   A soft hyphen.
   .El
   .Pp
   Escape characters are also passed verbatim into text strings.
   An escape character is a sequence of characters beginning with the
   backslash
   .Pq Sq \e .
   To construct human-readable text, these should be intercepted with
   .Fn mandoc_escape
   and converted with one of
   .Fn mchars_num2char ,
   .Fn mchars_spec2str ,
   and so on.
 .Ss Man Abstract Syntax Tree  .Ss Man Abstract Syntax Tree
 This AST is governed by the ontological rules dictated in  This AST is governed by the ontological rules dictated in
 .Xr man 7  .Xr man 7
Line 290  where capitalised non-terminals represent nodes.
Line 525  where capitalised non-terminals represent nodes.
 .It ELEMENT  .It ELEMENT
 \(<- ELEMENT | TEXT*  \(<- ELEMENT | TEXT*
 .It TEXT  .It TEXT
 \(<- [[:alpha:]]*  \(<- [[:ascii:]]*
 .El  .El
 .Pp  .Pp
 The only elements capable of nesting other elements are those with  The only elements capable of nesting other elements are those with
Line 349  where capitalised non-terminals represent nodes.
Line 584  where capitalised non-terminals represent nodes.
 .It TAIL  .It TAIL
 \(<- mnode*  \(<- mnode*
 .It TEXT  .It TEXT
 \(<- [[:printable:],0x1e]*  \(<- [[:ascii:]]*
 .El  .El
 .Pp  .Pp
 Of note are the TEXT nodes following the HEAD, BODY and TAIL nodes of  Of note are the TEXT nodes following the HEAD, BODY and TAIL nodes of
Line 436  levels of badly-nested blocks.
Line 671  levels of badly-nested blocks.
 .Xr mandoc 1 ,  .Xr mandoc 1 ,
 .Xr eqn 7 ,  .Xr eqn 7 ,
 .Xr man 7 ,  .Xr man 7 ,
   .Xr mandoc_char 7 ,
 .Xr mdoc 7 ,  .Xr mdoc 7 ,
 .Xr roff 7 ,  .Xr roff 7 ,
 .Xr tbl 7  .Xr tbl 7
Line 443  levels of badly-nested blocks.
Line 679  levels of badly-nested blocks.
 The  The
 .Nm  .Nm
 library was written by  library was written by
 .An Kristaps Dzonsons Aq kristaps@bsd.lv .  .An Kristaps Dzonsons Aq Mt kristaps@bsd.lv .

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