mirror of
https://github.com/richgel999/ufo_data.git
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293 lines
7.5 KiB
Groff
293 lines
7.5 KiB
Groff
.\"
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.\" Copyright (c) 2009 - 2016 Natacha Porté <natacha@instinctive.eu>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd September 12, 2016
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.Dt SOLDOUT_MARKDOWN 3
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.Os
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.Sh NAME
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.Nm soldout_markdown ,
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.Nm markdown
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.Nd parse markdown document
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.Sh SYNOPSIS
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.In markdown.h
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.Pp
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.Fd "#define MKD_CELL_ALIGN_DEFAULT"
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.Fd "#define MKD_CELL_ALIGN_LEFT"
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.Fd "#define MKD_CELL_ALIGN_RIGHT"
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.Fd "#define MKD_CELL_ALIGN_CENTER"
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.Fd "#define MKD_CELL_ALIGN_MASK"
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.Fd "#define MKD_CELL_HEAD"
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.Fd "#define MKD_LIST_ORDERED"
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.Fd "#define MKD_LI_BLOCK"
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.Ft void
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.Fo markdown
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.Fa "struct buf *ob"
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.Fa "struct buf *ib"
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.Fa "const struct mkd_renderer *rndr"
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.Fc
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.Sh DESCRIPTION
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The
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.Fn markdown
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function parses the input buffer
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.Fa ib
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and renders it into the output buffer
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.Fa ob ;
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.Fa rndr
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is a pointer to the renderer structure.
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.Pp
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The following describes a general parse sequence:
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.Bl -enum
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.It
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Create output, input buffers by
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.Fn bufnew
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function.
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.It
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Fill input buffer by
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.Fn bufput
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function.
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.It
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Create
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.Vt "struct mkd_renderer"
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or use provided renderer.
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.It
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Call
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.Fn markdown
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function.
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.It
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Process output buffer.
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.It
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Call
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.Fn bufrelease
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function to clean up buffers.
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.El
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.Sh REFERENCE
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This section documents the functions, types, definitions available via
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.In markdown.h .
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.Ss Types
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.Bl -ohang
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.It Vt "enum mkd_autolink"
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type of autolink:
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.Bl -tag -width Ds
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.It MKDA_NORMAL
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normal http/https/ftp link.
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.It MKDA_EXPLICIT_EMAIL
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e-mail link with explicit mailto.
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.It MKDA_IMPLICIT_EMAIL
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e-mail link without mailto.
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.El
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.It Vt "struct mkd_renderer"
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has this form:
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.Bd -literal -offset indent
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struct mkd_renderer {
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/* document level callbacks */
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void (*prolog)(struct buf *ob, void *opaque);
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void (*epilog)(struct buf *ob, void *opaque);
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/* block level callbacks - NULL skips the block */
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void (*blockcode)(struct buf *ob,
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struct buf *text,
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void *opaque);
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void (*blockquote)(struct buf *ob,
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struct buf *text,
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void *opaque);
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void (*blockhtml)(struct buf *ob,
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struct buf *text,
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void *opaque);
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void (*header)(struct buf *ob,
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struct buf *text, int level,
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void *opaque);
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void (*hrule)(struct buf *ob, void *opaque);
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void (*list)(struct buf *ob,
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struct buf *text, int flags,
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void *opaque);
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void (*listitem)(struct buf *ob,
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struct buf *text, int flags,
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void *opaque);
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void (*paragraph)(struct buf *ob,
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struct buf *text,
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void *opaque);
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void (*table)(struct buf *ob,
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struct buf *head_row, struct buf *rows,
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void *opaque);
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void (*table_cell)(struct buf *ob,
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struct buf *text, int flags,
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void *opaque);
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void (*table_row)(struct buf *ob,
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struct buf *cells, int flags,
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void *opaque);
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/* span level callbacks - NULL or return 0 prints the span verbatim */
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int (*autolink)(struct buf *ob,
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struct buf *link, enum mkd_autolink type,
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void *opaque);
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int (*codespan)(struct buf *ob,
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struct buf *text,
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void *opaque);
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int (*emphasis)(struct buf *ob,
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struct buf *text, char c,
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void *opaque);
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int (*double_emphasis)(struct buf *ob,
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struct buf *text, char c,
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void *opaque);
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int (*triple_emphasis)(struct buf *ob,
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struct buf *text, char c,
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void *opaque);
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int (*image)(struct buf *ob,
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struct buf *link, struct buf *title, struct buf *alt,
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void *opaque);
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int (*linebreak)(struct buf *ob, void *opaque);
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int (*link)(struct buf *ob,
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struct buf *link, struct buf *title, struct buf *content,
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void *opaque);
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int (*raw_html_tag)(struct buf *ob,
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struct buf *tag,
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void *opaque);
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/* low level callbacks - NULL copies input directly into the output */
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void (*entity)(struct buf *ob,
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struct buf *entity,
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void *opaque);
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void (*normal_text)(struct buf *ob,
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struct buf *text,
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void *opaque);
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/* renderer data */
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int max_work_stack; /* prevent arbitrary deep recursion, cf README */
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const char *emph_chars; /* chars that trigger emphasis rendering */
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void *opaque; /* opaque data send to every rendering callback */
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};
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.Ed
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.Pp
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The first argument of a renderer function is always the output buffer,
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where the function is supposed to write its output.
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The last argument of a renderer function is always
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a private pointer, which is
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.Va opaque
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member of
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.Vt struct mkd_renderer .
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libsoldout itself never does nothing with this data.
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.Pp
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Function pointers in
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.Vt "struct mkd_renderer"
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can be
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.Dv NULL .
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A null block-level callback will make the corresponding block
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disappear from the output, as if the callback was an empty function.
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A null span-level callback will cause the corresponding element
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to be treated as normal characters, copied verbatim to the output.
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Moreover, span-level callbacks return an integer, which tells
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whether the renderer accepts to render the item (non-zero return value)
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or whether it should be copied verbatim (zero return value).
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.Pp
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.Fa flags
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of the
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.Va list
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and
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.Va listitem
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function callbacks are:
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.Dv MKD_LIST_ORDERED ,
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.Dv MKD_LI_BLOCK .
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.Pp
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.Fa flags
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of the
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.Va table_cell
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and
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.Va table_row
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function callbacks are:
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.Dv MKD_CELL_ALIGN_DEFAULT ,
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.Dv MKD_CELL_ALIGN_LEFT ,
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.Dv MKD_CELL_ALIGN_RIGHT ,
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.Dv MKD_CELL_ALIGN_CENTER ,
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.Dv MKD_CELL_ALIGN_MASK ,
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.Dv MKD_CELL_HEAD .
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.Pp
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The
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.Va normal_text
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callback should perform whatever escape is needed
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to have the output looking like the input data.
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.Pp
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.Va emph_chars
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is a zero-terminated string which contains
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the set of characters that trigger emphasis.
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In regular markdown, emphasis is only
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triggered by
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.Sq _
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and
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.Sq * ,
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but in some extensions it might be useful to
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add other characters to this list.
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The character that triggered the emphasis is then passed to
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.Va emphasis , double_emphasis
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and
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.Va triple_emphasis
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function callbacks through the parameter
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.Fa c .
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.El
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.Sh EXAMPLES
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Simple example that uses first argument as a markdown string,
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converts it to an HTML and outputs it to stdout.
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.Bd -literal
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#include <stdio.h>
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#include <buffer.h>
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#include <markdown.h>
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#include <renderers.h>
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#define INPUT_UNIT 1024
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#define OUTPUT_UNIT 64
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int
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main(int argc, char *argv[])
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{
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struct buf *ib, *ob;
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/* Make sure we have enough arguments. */
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if (argc != 2) {
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return 1;
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}
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ib = bufnew(INPUT_UNIT);
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ob = bufnew(OUTPUT_UNIT);
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/* bufputs() is a wrapper over bufput() for nil-terminated string. */
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bufputs(ib, argv[1]);
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markdown(ob, ib, &mkd_html);
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/* Note the resulted data is not nil-terminated string;
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* to make it use bufnullterm(). */
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printf("%.*s", (int)ob->size, ob->data);
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bufrelease(ib);
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bufrelease(ob);
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return 0;
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}
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.Ed
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.Sh SEE ALSO
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.Xr soldout_array 3 ,
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.Xr soldout_buffer 3 ,
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.Xr soldout_renderers 3 ,
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.Lk http://daringfireball.net/projects/markdown/ John Gruber's markdown format
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm soldout
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library was written by
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.An Natasha Qo Kerensikova Qc Porte Aq Mt natacha@instinctive.eu .
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Manual page was originally written by
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.An Massimo Manghi Aq Mt mxmanghi@apache.org ,
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and rewritten to mdoc format by
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.An Svyatoslav Mishyn Aq Mt juef@openmailbox.org .
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