diff options
Diffstat (limited to 'syntax.c')
| -rw-r--r-- | syntax.c | 110 |
1 files changed, 109 insertions, 1 deletions
@@ -13,13 +13,14 @@ Language language_from_str(char const *str) { return LANG_NONE; } -// start of single line comment for language l +// start of single line comment for language l -- used for comment/uncomment selection char const *language_comment_start(Language l) { switch (l) { case LANG_C: return "/* "; case LANG_RUST: case LANG_CPP: return "// "; case LANG_PYTHON: return "# "; + case LANG_TEX: return "% "; case LANG_NONE: case LANG_COUNT: break; @@ -552,6 +553,110 @@ static void syntax_highlight_python(SyntaxState *state, char32_t *line, u32 line } } +static bool is_tex_ident(char32_t c) { + // digits cannot appear in tex identifiers + return is32_ident(c) && !is32_digit(c); +} + +static void syntax_highlight_tex(SyntaxState *state, char32_t *line, u32 line_len, SyntaxCharType *char_types) { + bool dollar = (*state & SYNTAX_STATE_TEX_DOLLAR) != 0; + bool dollardollar = (*state & SYNTAX_STATE_TEX_DOLLARDOLLAR) != 0; + bool verbatim = (*state & SYNTAX_STATE_TEX_VERBATIM) != 0; + + for (u32 i = 0; i < line_len; ++i) { + char32_t c = line[i]; + bool has_1_char = i + 1 < line_len; + + if (char_types) + char_types[i] = dollar || dollardollar ? SYNTAX_MATH : SYNTAX_NORMAL; + switch (c) { + case '\\': + if (has_1_char) { + if (is32_graph(line[i+1])) { + if (is_tex_ident(line[i+1])) { + // command, e.g. \begin + String32 command_str = { + .str = line + i+1, + .len = line_len - (i+1), + }; + bool new_verbatim = false; + if (!dollar && !dollardollar) { + if (!verbatim && str32_has_ascii_prefix(command_str, "begin{verbatim}")) { + new_verbatim = true; + } else if (verbatim && str32_has_ascii_prefix(command_str, "end{verbatim}")) { + verbatim = false; + } + } + + if (!verbatim) { + if (char_types) char_types[i] = SYNTAX_KEYWORD; + for (++i; i < line_len; ++i) { + if (is_tex_ident(line[i])) { + if (char_types) char_types[i] = SYNTAX_KEYWORD; + } else { + --i; + break; + } + } + verbatim = new_verbatim; + } + } else if (!verbatim) { + // something like \\, \%, etc. + if (char_types) char_types[i] = SYNTAX_KEYWORD; + ++i; + if (char_types) char_types[i] = SYNTAX_KEYWORD; + } + } + } + break; + case '%': + // comment + if (!verbatim) { + for (; i < line_len; ++i) { + if (char_types) + char_types[i] = SYNTAX_COMMENT; + } + } + break; + case '&': + // table/matrix/etc. separator + if (char_types && !verbatim) + char_types[i] = SYNTAX_BUILTIN; + break; + case '$': + if (!verbatim) { + if (!dollar && has_1_char && line[i+1] == '$') { + // $$ + if (dollardollar) { + if (char_types) char_types[i] = SYNTAX_MATH; + ++i; + if (char_types) char_types[i] = SYNTAX_MATH; + dollardollar = false; + } else { + if (char_types) char_types[i] = SYNTAX_MATH; + dollardollar = true; + } + } else if (!dollardollar) { + // single $ + if (dollar) { + dollar = false; + } else { + dollar = true; + if (char_types) char_types[i] = SYNTAX_MATH; + } + } + } + break; + } + } + + *state = (SyntaxState)( + (dollar * SYNTAX_STATE_TEX_DOLLAR) + | (dollardollar * SYNTAX_STATE_TEX_DOLLARDOLLAR) + | (verbatim * SYNTAX_STATE_TEX_VERBATIM) + ); +} + // 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. @@ -574,6 +679,9 @@ void syntax_highlight(SyntaxState *state, Language lang, char32_t *line, u32 lin case LANG_PYTHON: syntax_highlight_python(state, line, line_len, char_types); break; + case LANG_TEX: + syntax_highlight_tex(state, line, line_len, char_types); + break; case LANG_COUNT: assert(0); break; } } |