/* * MD4C: Markdown parser for C * (http://github.com/mity/md4c) * * Copyright (c) 2016-2020 Martin Mitas * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #ifndef MD4C_H #define MD4C_H #ifdef __cplusplus extern "C" { #endif #if defined MD4C_USE_UTF16 /* Magic to support UTF-16. Note that in order to use it, you have to define * the macro MD4C_USE_UTF16 both when building MD4C as well as when * including this header in your code. */ #ifdef _WIN32 #include typedef WCHAR MD_CHAR; #else #error MD4C_USE_UTF16 is only supported on Windows. #endif #else typedef char MD_CHAR; #endif typedef unsigned MD_SIZE; typedef unsigned MD_OFFSET; /* Block represents a part of document hierarchy structure like a paragraph * or list item. */ typedef enum MD_BLOCKTYPE { /* ... */ MD_BLOCK_DOC = 0, /*

...

*/ MD_BLOCK_QUOTE, /*

... * Detail: Structure MD_BLOCK_UL_DETAIL. */ MD_BLOCK_UL, /*

... * Detail: Structure MD_BLOCK_OL_DETAIL. */ MD_BLOCK_OL, /*

...

* Detail: Structure MD_BLOCK_LI_DETAIL. */ MD_BLOCK_LI, /*

*/ MD_BLOCK_HR, /*

...

(for levels up to 6) * Detail: Structure MD_BLOCK_H_DETAIL. */ MD_BLOCK_H, /*

...

* Note the text lines within code blocks are terminated with '\n' * instead of explicit MD_TEXT_BR. */ MD_BLOCK_CODE, /* Raw HTML block. This itself does not correspond to any particular HTML * tag. The contents of it _is_ raw HTML source intended to be put * in verbatim form to the HTML output. */ MD_BLOCK_HTML, /*

...

*/ MD_BLOCK_P, /* ...

and its contents. * Detail: Structure MD_BLOCK_TABLE_DETAIL (for MD_BLOCK_TABLE), * structure MD_BLOCK_TD_DETAIL (for MD_BLOCK_TH and MD_BLOCK_TD) * Note all of these are used only if extension MD_FLAG_TABLES is enabled. */ MD_BLOCK_TABLE, MD_BLOCK_THEAD, MD_BLOCK_TBODY, MD_BLOCK_TR, MD_BLOCK_TH, MD_BLOCK_TD } MD_BLOCKTYPE; /* Span represents an in-line piece of a document which should be rendered with * the same font, color and other attributes. A sequence of spans forms a block * like paragraph or list item. */ typedef enum MD_SPANTYPE { /* ... */ MD_SPAN_EM, /* ... */ MD_SPAN_STRONG, /* ... * Detail: Structure MD_SPAN_A_DETAIL. */ MD_SPAN_A, /*

... * Detail: Structure MD_SPAN_IMG_DETAIL. * Note: Image text can contain nested spans and even nested images. * If rendered into ALT attribute of HTML tag, it's responsibility * of the parser to deal with it. */ MD_SPAN_IMG, /* ... */ MD_SPAN_CODE, /* ~~...~~ * Note: Recognized only when MD_FLAG_STRIKETHROUGH is enabled. */ MD_SPAN_DEL, /* For recognizing inline ($) and display ($$) equations * Note: Recognized only when MD_FLAG_LATEXMATHSPANS is enabled. */ MD_SPAN_LATEXMATH, MD_SPAN_LATEXMATH_DISPLAY, /* Wiki links * Note: Recognized only when MD_FLAG_WIKILINKS is enabled. */ MD_SPAN_WIKILINK, /* ... * Note: Recognized only when MD_FLAG_UNDERLINE is enabled. */ MD_SPAN_U } MD_SPANTYPE; /* Text is the actual textual contents of span. */ typedef enum MD_TEXTTYPE { /* Normal text. */ MD_TEXT_NORMAL = 0, /* NULL character. CommonMark requires replacing NULL character with * the replacement char U+FFFD, so this allows caller to do that easily. */ MD_TEXT_NULLCHAR, /* Line breaks. * Note these are not sent from blocks with verbatim output (MD_BLOCK_CODE * or MD_BLOCK_HTML). In such cases, '\n' is part of the text itself. */ MD_TEXT_BR, /*
(hard break) */ MD_TEXT_SOFTBR, /* '\n' in source text where it is not semantically meaningful (soft break) */ /* Entity. * (a) Named entity, e.g. * (Note MD4C does not have a list of known entities. * Anything matching the regexp /&[A-Za-z][A-Za-z0-9]{1,47};/ is * treated as a named entity.) * (b) Numerical entity, e.g. Ӓ * (c) Hexadecimal entity, e.g. ካ * * As MD4C is mostly encoding agnostic, application gets the verbatim * entity text into the MD_PARSER::text_callback(). */ MD_TEXT_ENTITY, /* Text in a code block (inside MD_BLOCK_CODE) or inlined code (`code`). * If it is inside MD_BLOCK_CODE, it includes spaces for indentation and * '\n' for new lines. MD_TEXT_BR and MD_TEXT_SOFTBR are not sent for this * kind of text. */ MD_TEXT_CODE, /* Text is a raw HTML. If it is contents of a raw HTML block (i.e. not * an inline raw HTML), then MD_TEXT_BR and MD_TEXT_SOFTBR are not used. * The text contains verbatim '\n' for the new lines. */ MD_TEXT_HTML, /* Text is inside an equation. This is processed the same way as inlined code * spans (`code`). */ MD_TEXT_LATEXMATH } MD_TEXTTYPE; /* Alignment enumeration. */ typedef enum MD_ALIGN { MD_ALIGN_DEFAULT = 0, /* When unspecified. */ MD_ALIGN_LEFT, MD_ALIGN_CENTER, MD_ALIGN_RIGHT } MD_ALIGN; /* String attribute. * * This wraps strings which are outside of a normal text flow and which are * propagated within various detailed structures, but which still may contain * string portions of different types like e.g. entities. * * So, for example, lets consider this image: * * ![image alt text](http://example.org/image.png 'foo " bar') * * The image alt text is propagated as a normal text via the MD_PARSER::text() * callback. However, the image title ('foo " bar') is propagated as * MD_ATTRIBUTE in MD_SPAN_IMG_DETAIL::title. * * Then the attribute MD_SPAN_IMG_DETAIL::title shall provide the following: * -- [0]: "foo " (substr_types[0] == MD_TEXT_NORMAL; substr_offsets[0] == 0) * -- [1]: """ (substr_types[1] == MD_TEXT_ENTITY; substr_offsets[1] == 4) * -- [2]: " bar" (substr_types[2] == MD_TEXT_NORMAL; substr_offsets[2] == 10) * -- [3]: (n/a) (n/a ; substr_offsets[3] == 14) * * Note that these invariants are always guaranteed: * -- substr_offsets[0] == 0 * -- substr_offsets[LAST+1] == size * -- Currently, only MD_TEXT_NORMAL, MD_TEXT_ENTITY, MD_TEXT_NULLCHAR * substrings can appear. This could change only of the specification * changes. */ typedef struct MD_ATTRIBUTE { const MD_CHAR* text; MD_SIZE size; const MD_TEXTTYPE* substr_types; const MD_OFFSET* substr_offsets; } MD_ATTRIBUTE; /* Detailed info for MD_BLOCK_UL. */ typedef struct MD_BLOCK_UL_DETAIL { int is_tight; /* Non-zero if tight list, zero if loose. */ MD_CHAR mark; /* Item bullet character in MarkDown source of the list, e.g. '-', '+', '*'. */ } MD_BLOCK_UL_DETAIL; /* Detailed info for MD_BLOCK_OL. */ typedef struct MD_BLOCK_OL_DETAIL { unsigned start; /* Start index of the ordered list. */ int is_tight; /* Non-zero if tight list, zero if loose. */ MD_CHAR mark_delimiter; /* Character delimiting the item marks in MarkDown source, e.g. '.' or ')' */ } MD_BLOCK_OL_DETAIL; /* Detailed info for MD_BLOCK_LI. */ typedef struct MD_BLOCK_LI_DETAIL { int is_task; /* Can be non-zero only with MD_FLAG_TASKLISTS */ MD_CHAR task_mark; /* If is_task, then one of 'x', 'X' or ' '. Undefined otherwise. */ MD_OFFSET task_mark_offset; /* If is_task, then offset in the input of the char between '[' and ']'. */ } MD_BLOCK_LI_DETAIL; /* Detailed info for MD_BLOCK_H. */ typedef struct MD_BLOCK_H_DETAIL { unsigned level; /* Header level (1 - 6) */ } MD_BLOCK_H_DETAIL; /* Detailed info for MD_BLOCK_CODE. */ typedef struct MD_BLOCK_CODE_DETAIL { MD_ATTRIBUTE info; MD_ATTRIBUTE lang; MD_CHAR fence_char; /* The character used for fenced code block; or zero for indented code block. */ } MD_BLOCK_CODE_DETAIL; /* Detailed info for MD_BLOCK_TABLE. */ typedef struct MD_BLOCK_TABLE_DETAIL { unsigned col_count; /* Count of columns in the table. */ unsigned head_row_count; /* Count of rows in the table header (currently always 1) */ unsigned body_row_count; /* Count of rows in the table body */ } MD_BLOCK_TABLE_DETAIL; /* Detailed info for MD_BLOCK_TH and MD_BLOCK_TD. */ typedef struct MD_BLOCK_TD_DETAIL { MD_ALIGN align; } MD_BLOCK_TD_DETAIL; /* Detailed info for MD_SPAN_A. */ typedef struct MD_SPAN_A_DETAIL { MD_ATTRIBUTE href; MD_ATTRIBUTE title; } MD_SPAN_A_DETAIL; /* Detailed info for MD_SPAN_IMG. */ typedef struct MD_SPAN_IMG_DETAIL { MD_ATTRIBUTE src; MD_ATTRIBUTE title; } MD_SPAN_IMG_DETAIL; /* Detailed info for MD_SPAN_WIKILINK. */ typedef struct MD_SPAN_WIKILINK { MD_ATTRIBUTE target; } MD_SPAN_WIKILINK_DETAIL; /* Flags specifying extensions/deviations from CommonMark specification. * * By default (when MD_PARSER::flags == 0), we follow CommonMark specification. * The following flags may allow some extensions or deviations from it. */ #define MD_FLAG_COLLAPSEWHITESPACE 0x0001 /* In MD_TEXT_NORMAL, collapse non-trivial whitespace into single ' ' */ #define MD_FLAG_PERMISSIVEATXHEADERS 0x0002 /* Do not require space in ATX headers ( ###header ) */ #define MD_FLAG_PERMISSIVEURLAUTOLINKS 0x0004 /* Recognize URLs as autolinks even without '<', '>' */ #define MD_FLAG_PERMISSIVEEMAILAUTOLINKS 0x0008 /* Recognize e-mails as autolinks even without '<', '>' and 'mailto:' */ #define MD_FLAG_NOINDENTEDCODEBLOCKS 0x0010 /* Disable indented code blocks. (Only fenced code works.) */ #define MD_FLAG_NOHTMLBLOCKS 0x0020 /* Disable raw HTML blocks. */ #define MD_FLAG_NOHTMLSPANS 0x0040 /* Disable raw HTML (inline). */ #define MD_FLAG_TABLES 0x0100 /* Enable tables extension. */ #define MD_FLAG_STRIKETHROUGH 0x0200 /* Enable strikethrough extension. */ #define MD_FLAG_PERMISSIVEWWWAUTOLINKS 0x0400 /* Enable WWW autolinks (even without any scheme prefix, if they begin with 'www.') */ #define MD_FLAG_TASKLISTS 0x0800 /* Enable task list extension. */ #define MD_FLAG_LATEXMATHSPANS 0x1000 /* Enable $ and $$ containing LaTeX equations. */ #define MD_FLAG_WIKILINKS 0x2000 /* Enable wiki links extension. */ #define MD_FLAG_UNDERLINE 0x4000 /* Enable underline extension (and disables '_' for normal emphasis). */ #define MD_FLAG_PERMISSIVEAUTOLINKS (MD_FLAG_PERMISSIVEEMAILAUTOLINKS | MD_FLAG_PERMISSIVEURLAUTOLINKS | MD_FLAG_PERMISSIVEWWWAUTOLINKS) #define MD_FLAG_NOHTML (MD_FLAG_NOHTMLBLOCKS | MD_FLAG_NOHTMLSPANS) /* Convenient sets of flags corresponding to well-known Markdown dialects. * * Note we may only support subset of features of the referred dialect. * The constant just enables those extensions which bring us as close as * possible given what features we implement. * * ABI compatibility note: Meaning of these can change in time as new * extensions, bringing the dialect closer to the original, are implemented. */ #define MD_DIALECT_COMMONMARK 0 #define MD_DIALECT_GITHUB (MD_FLAG_PERMISSIVEAUTOLINKS | MD_FLAG_TABLES | MD_FLAG_STRIKETHROUGH | MD_FLAG_TASKLISTS) /* Parser structure. */ typedef struct MD_PARSER { /* Reserved. Set to zero. */ unsigned abi_version; /* Dialect options. Bitmask of MD_FLAG_xxxx values. */ unsigned flags; /* Caller-provided rendering callbacks. * * For some block/span types, more detailed information is provided in a * type-specific structure pointed by the argument 'detail'. * * The last argument of all callbacks, 'userdata', is just propagated from * md_parse() and is available for any use by the application. * * Note any strings provided to the callbacks as their arguments or as * members of any detail structure are generally not zero-terminated. * Application has to take the respective size information into account. * * Any rendering callback may abort further parsing of the document by * returning non-zero. */ int (*enter_block)(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/); int (*leave_block)(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/); int (*enter_span)(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/); int (*leave_span)(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/); int (*text)(MD_TEXTTYPE /*type*/, const MD_CHAR* /*text*/, MD_SIZE /*size*/, void* /*userdata*/); /* Debug callback. Optional (may be NULL). * * If provided and something goes wrong, this function gets called. * This is intended for debugging and problem diagnosis for developers; * it is not intended to provide any errors suitable for displaying to an * end user. */ void (*debug_log)(const char* /*msg*/, void* /*userdata*/); /* Reserved. Set to NULL. */ void (*syntax)(void); } MD_PARSER; /* For backward compatibility. Do not use in new code. */ typedef MD_PARSER MD_RENDERER; /* Parse the Markdown document stored in the string 'text' of size 'size'. * The parser provides callbacks to be called during the parsing so the * caller can render the document on the screen or convert the Markdown * to another format. * * Zero is returned on success. If a runtime error occurs (e.g. a memory * fails), -1 is returned. If the processing is aborted due any callback * returning non-zero, the return value of the callback is returned. */ int md_parse(const MD_CHAR* text, MD_SIZE size, const MD_PARSER* parser, void* userdata); #ifdef __cplusplus } /* extern "C" { */ #endif #endif /* MD4C_H */