diff options
Diffstat (limited to 'syntax.c')
| -rw-r--r-- | syntax.c | 191 |
1 files changed, 191 insertions, 0 deletions
@@ -22,6 +22,7 @@ char const *language_comment_start(Language l) { case LANG_PYTHON: return "# "; case LANG_TEX: return "% "; case LANG_NONE: + case LANG_MARKDOWN: case LANG_COUNT: break; } @@ -657,6 +658,193 @@ static void syntax_highlight_tex(SyntaxState *state, char32_t *line, u32 line_le ); } +static void syntax_highlight_markdown(SyntaxState *state, char32_t *line, u32 line_len, SyntaxCharType *char_types) { + bool multiline_code = (*state & SYNTAX_STATE_MARKDOWN_CODE) != 0; + + *state = (multiline_code * SYNTAX_STATE_MARKDOWN_CODE); + + if (line_len >= 3 && line[0] == '`' && line[1] == '`' && line[2] == '`') { + if (multiline_code) { + // end of multi-line code + *state = 0; + } else { + // start of multi-line code + multiline_code = true; + *state = SYNTAX_STATE_MARKDOWN_CODE; + } + } + + if (!char_types) { + return; + } + + if (multiline_code) { + static_assert_if_possible(sizeof *char_types == 1) + memset(char_types, SYNTAX_CODE, line_len); + return; + } + + bool start_of_line = true; // is this the start of the line (not counting whitespace) + int backslashes = 0; + char const *format_ending = NULL; // "**" if we are inside **bold**, etc. + + for (u32 i = 0; i < line_len; ++i) { + char32_t c = line[i]; + bool next_sol = start_of_line && is32_space(c); + bool has_1_char = i+1 < line_len; + bool next_is_space = has_1_char && is32_space(line[i+1]); + + char_types[i] = SYNTAX_NORMAL; + if (format_ending) { + if (streq(format_ending, "`")) + char_types[i] = SYNTAX_CODE; + else + char_types[i] = SYNTAX_STRING; + } + + String32 remains = { + .str = line + i, + .len = line_len - i + }; + if (!format_ending && str32_has_ascii_prefix(remains, "http")) { + if (str32_has_ascii_prefix(remains, "http://") + || str32_has_ascii_prefix(remains, "https://")) { + // a link! + for (; i < line_len; ++i) { + if (is32_space(line[i])) + break; + char_types[i] = SYNTAX_LINK; + } + if (line[i-1] < 128 && strchr(".!,", (char)line[i-1])) { + // punctuation after URLs + char_types[i-1] = SYNTAX_NORMAL; + } + goto bottom; + } + } + + switch (c) { + case '#': + if (start_of_line) { + memset(char_types + i, SYNTAX_STRING, line_len - i); + i = line_len; + } + break; + case '*': + if (start_of_line && next_is_space) { + // bullet list item + char_types[i] = SYNTAX_BUILTIN; + } + FALLTHROUGH + case '_': + if (backslashes % 2 == 1) { + // \* or \_ + } else if (has_1_char && line[i+1] == c) { + // **bold** or __bold__ + char const *end = c == '*' ? "**" : "__"; + if (format_ending) { + if (streq(format_ending, end)) { + char_types[i++] = SYNTAX_STRING; + char_types[i] = SYNTAX_STRING; + format_ending = NULL; + } + } else if (!next_is_space) { + char_types[i++] = SYNTAX_STRING; + char_types[i] = SYNTAX_STRING; + format_ending = end; + } + } else { + // *italics* or _italics_ + char const *end = c == '*' ? "*" : "_"; + if (format_ending) { + if (streq(format_ending, end)) + format_ending = NULL; + } else if (!next_is_space) { + char_types[i] = SYNTAX_STRING; + format_ending = end; + } + } + break; + case '`': + if (backslashes % 2 == 1) { + // \` + } else if (format_ending) { + if (streq(format_ending, "`")) + format_ending = NULL; + } else { + char_types[i] = SYNTAX_CODE; + format_ending = "`"; + } + break; + case '-': + case '>': + if (start_of_line && next_is_space) { + // list item/blockquote + char_types[i] = SYNTAX_BUILTIN; + } + break; + case ANY_DIGIT: + if (start_of_line) { + size_t spn = str32_ascii_spn(remains, "0123456789"); + size_t end = i + spn; + if (end < line_len && line[end] == '.') { + // numbered list item + for (; i <= end; ++i) { + char_types[i] = SYNTAX_BUILTIN; + } + } + } + break; + case '[': { + if (backslashes % 2 == 0) { + // [URLS](like-this.com) + u32 j; + for (j = i+1; j < line_len; ++j) { + if (line[j] == ']' && backslashes % 2 == 0) + break; + if (line[j] == '\\') + ++backslashes; + else + backslashes = 0; + } + backslashes = 0; + u32 closing_bracket = j; + if (closing_bracket+2 < line_len && line[closing_bracket+1] == '(') { + for (j = closing_bracket+2; j < line_len; ++j) { + if (line[j] == ')' && backslashes % 2 == 0) + break; + if (line[j] == '\\') + ++backslashes; + else + backslashes = 0; + } + u32 closing_parenthesis = j; + if (closing_parenthesis < line_len) { + // hooray! + if (i > 0 && line[i-1] == '!') + --i; // images are links, but with ! before them + memset(&char_types[i], SYNTAX_LINK, closing_parenthesis+1 - i); + i = closing_parenthesis; + } + backslashes = 0; + + } + } + } break; + } + bottom: + if (i >= line_len) break; + + if (line[i] != '\\') + backslashes = 0; + else + ++backslashes; + + start_of_line = next_sol; + } + +} + // This is the main syntax highlighting function. It will determine which colors to use for each character. // Rather than returning colors, it returns a character type (e.g. comment) which can be converted to a color. // To highlight multiple lines, start out with a zeroed SyntaxState, and pass a pointer to it each time. @@ -682,6 +870,9 @@ void syntax_highlight(SyntaxState *state, Language lang, char32_t *line, u32 lin case LANG_TEX: syntax_highlight_tex(state, line, line_len, char_types); break; + case LANG_MARKDOWN: + syntax_highlight_markdown(state, line, line_len, char_types); + break; case LANG_COUNT: assert(0); break; } } |