version 1.43, 2010/06/27 15:52:41 |
version 1.45, 2010/06/29 19:20:38 |
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.Vt extern const char * const * mdoc_argnames; |
.Vt extern const char * const * mdoc_argnames; |
.Ft "struct mdoc *" |
.Ft "struct mdoc *" |
.Fo mdoc_alloc |
.Fo mdoc_alloc |
.Fa "const struct regset *regs" |
.Fa "struct regset *regs" |
.Fa "void *data" |
.Fa "void *data" |
.Fa "int pflags" |
.Fa "int pflags" |
.Fa "mandocmsg msgs" |
.Fa "mandocmsg msgs" |
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fields), its position in the tree (the |
fields), its position in the tree (the |
.Va parent , |
.Va parent , |
.Va child , |
.Va child , |
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.Va nchild , |
.Va next |
.Va next |
and |
and |
.Va prev |
.Va prev |
fields) and some type-specific data. |
fields) and some type-specific data, in particular, for nodes generated |
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from macros, the generating macro in the |
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.Va tok |
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field. |
.Pp |
.Pp |
The tree itself is arranged according to the following normal form, |
The tree itself is arranged according to the following normal form, |
where capitalised non-terminals represent nodes. |
where capitalised non-terminals represent nodes. |
Line 235 where capitalised non-terminals represent nodes. |
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Line 239 where capitalised non-terminals represent nodes. |
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.It ELEMENT |
.It ELEMENT |
\(<- TEXT* |
\(<- TEXT* |
.It HEAD |
.It HEAD |
\(<- mnode+ |
\(<- mnode* |
.It BODY |
.It BODY |
\(<- mnode+ |
\(<- mnode* [ENDBODY mnode*] |
.It TAIL |
.It TAIL |
\(<- mnode+ |
\(<- mnode* |
.It TEXT |
.It TEXT |
\(<- [[:printable:],0x1e]* |
\(<- [[:printable:],0x1e]* |
.El |
.El |
Line 253 an empty line will produce a zero-length string. |
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Line 257 an empty line will produce a zero-length string. |
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Multiple body parts are only found in invocations of |
Multiple body parts are only found in invocations of |
.Sq \&Bl \-column , |
.Sq \&Bl \-column , |
where a new body introduces a new phrase. |
where a new body introduces a new phrase. |
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.Ss Badly nested blocks |
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A special kind of node is available to end the formatting |
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associated with a given block before the physical end of that block. |
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Such an ENDBODY node has a non-null |
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.Va end |
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field, is of the BODY |
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.Va type , |
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has the same |
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.Va tok |
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as the BLOCK it is ending, and has a |
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.Va pending |
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field pointing to that BLOCK's BODY node. |
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It is an indirect child of that BODY node |
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and has no children of its own. |
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.Pp |
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An ENDBODY node is generated when a block ends while one of its child |
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blocks is still open, like in the following example: |
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.Bd -literal -offset indent |
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\&.Ao ao |
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\&.Bo bo ac |
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\&.Ac bc |
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\&.Bc end |
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.Ed |
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.Pp |
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This example results in the following block structure: |
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.Bd -literal -offset indent |
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BLOCK Ao |
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HEAD Ao |
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BODY Ao |
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TEXT ao |
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BLOCK Bo, pending -> Ao |
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HEAD Bo |
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BODY Bo |
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TEXT bo |
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TEXT ac |
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ENDBODY Ao, pending -> Ao |
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TEXT bc |
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TEXT end |
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.Ed |
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.Pp |
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Here, the formatting of the Ao block extends from TEXT ao to TEXT ac, |
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while the formatting of the Bo block extends from TEXT bo to TEXT bc, |
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rendering like this in |
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.Fl T Ns Cm ascii |
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mode: |
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.Dl <ao [bo ac> bc] end |
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Support for badly nested blocks is only provided for backward |
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compatibility with some older |
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.Xr mdoc 7 |
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implementations. |
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Using them in new code is stronly discouraged: |
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Some frontends, in particular |
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.Fl T Ns Cm html , |
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are unable to render them in any meaningful way, |
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many other |
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.Xr mdoc 7 |
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implementations do not support them, and even for those that do, |
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the behaviour is not well-defined, in particular when using multiple |
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levels of badly nested blocks. |
.Sh EXAMPLES |
.Sh EXAMPLES |
The following example reads lines from stdin and parses them, operating |
The following example reads lines from stdin and parses them, operating |
on the finished parse tree with |
on the finished parse tree with |
.Fn parsed . |
.Fn parsed . |
This example does not error-check nor free memory upon failure. |
This example does not error-check nor free memory upon failure. |
.Bd -literal -offset indent |
.Bd -literal -offset indent |
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struct regset regs; |
struct mdoc *mdoc; |
struct mdoc *mdoc; |
const struct mdoc_node *node; |
const struct mdoc_node *node; |
char *buf; |
char *buf; |
size_t len; |
size_t len; |
int line; |
int line; |
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bzero(®s, sizeof(struct regset)); |
line = 1; |
line = 1; |
mdoc = mdoc_alloc(NULL, 0, NULL); |
mdoc = mdoc_alloc(®s, NULL, 0, NULL); |
buf = NULL; |
buf = NULL; |
alloc_len = 0; |
alloc_len = 0; |
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