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syntax.c
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syntax.c
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// syntax highlighting for ted
#include "ted-internal.h"
#include "keywords.h"
// ---- syntax state constants ----
// syntax state is explained in development.md
// these all say "CPP" but really they're C/C++
enum {
SYNTAX_STATE_CPP_MULTI_LINE_COMMENT = 0x1u, // are we in a multi-line comment? (delineated by /* */)
SYNTAX_STATE_CPP_SINGLE_LINE_COMMENT = 0x2u, // if you add a \ to the end of a single-line comment, it is continued to the next line.
SYNTAX_STATE_CPP_PREPROCESSOR = 0x4u, // similar to above
SYNTAX_STATE_CPP_STRING = 0x8u,
SYNTAX_STATE_CPP_RAW_STRING = 0x10u,
};
enum {
SYNTAX_STATE_RUST_COMMENT_DEPTH_MASK = 0xfu, // in rust, /* */ comments can nest.
SYNTAX_STATE_RUST_COMMENT_DEPTH_MUL = 0x1u,
SYNTAX_STATE_RUST_COMMENT_DEPTH_BITS = 4, // number of bits we allocate for the comment depth.
SYNTAX_STATE_RUST_STRING = 0x10u,
SYNTAX_STATE_RUST_STRING_IS_RAW = 0x20u,
};
enum {
SYNTAX_STATE_PYTHON_STRING = 0x01u, // multiline strings (''' and """)
SYNTAX_STATE_PYTHON_STRING_DBL_QUOTED = 0x02u, // is this a """ string, as opposed to a ''' string?
};
enum {
SYNTAX_STATE_GDSCRIPT_STRING = 0x01u, // multiline strings (''' and """)
SYNTAX_STATE_GDSCRIPT_STRING_DBL_QUOTED = 0x02u, // is this a """ string, as opposed to a ''' string?
};
enum {
SYNTAX_STATE_TEX_DOLLAR = 0x01u, // inside math $ ... $
SYNTAX_STATE_TEX_DOLLARDOLLAR = 0x02u, // inside math $$ ... $$
SYNTAX_STATE_TEX_VERBATIM = 0x04u, // inside \begin{verbatim} ... \end{verbatim}
};
enum {
SYNTAX_STATE_MARKDOWN_CODE = 0x01u, // inside ``` ``` code section
};
enum {
SYNTAX_STATE_HTML_COMMENT = 0x01u
};
enum {
SYNTAX_STATE_JAVASCRIPT_TEMPLATE_STRING = 0x01u,
SYNTAX_STATE_JAVASCRIPT_MULTILINE_COMMENT = 0x02u,
};
enum {
SYNTAX_STATE_JAVA_MULTILINE_COMMENT = 0x01u
};
enum {
SYNTAX_STATE_GO_RAW_STRING = 0x01u, // backtick-enclosed string
SYNTAX_STATE_GO_MULTILINE_COMMENT = 0x02u
};
enum {
SYNTAX_STATE_TED_CFG_STRING = 0x01u, // ` or "-delimited string
SYNTAX_STATE_TED_CFG_STRING_BACKTICK = 0x02u, // `-delimited string
};
enum {
SYNTAX_STATE_CSS_COMMENT = 0x01u,
SYNTAX_STATE_CSS_IN_BRACES = 0x02u,
};
typedef struct {
Language lang;
char *name;
} LanguageName;
static LanguageName *language_names = NULL; // dynamic array
Language language_from_str(const char *str) {
arr_foreach_ptr(language_names, LanguageName, lname) {
if (strcmp_case_insensitive(lname->name, str) == 0)
return lname->lang;
}
return LANG_NONE;
}
bool language_is_valid(Language language) {
arr_foreach_ptr(language_names, LanguageName, lname) {
if (lname->lang == language)
return true;
}
return false;
}
const char *language_to_str(Language language) {
arr_foreach_ptr(language_names, LanguageName, lname) {
if (lname->lang == language)
return lname->name;
}
return "???";
}
ColorSetting syntax_char_type_to_color_setting(SyntaxCharType t) {
switch (t) {
case SYNTAX_NORMAL: return COLOR_TEXT;
case SYNTAX_KEYWORD: return COLOR_KEYWORD;
case SYNTAX_COMMENT: return COLOR_COMMENT;
case SYNTAX_PREPROCESSOR: return COLOR_PREPROCESSOR;
case SYNTAX_STRING: return COLOR_STRING;
case SYNTAX_CHARACTER: return COLOR_CHARACTER;
case SYNTAX_CONSTANT: return COLOR_CONSTANT;
case SYNTAX_BUILTIN: return COLOR_BUILTIN;
case SYNTAX_TODO: return COLOR_TODO;
}
return COLOR_TEXT;
}
static bool syntax_keyword_matches(const char32_t *text, size_t len, const char *keyword) {
if (len == strlen(keyword)) {
bool matches = true;
const char32_t *p = text;
// check if `p` starts with `keyword`
for (const char *q = keyword; *q; ++p, ++q) {
if (*p != (char32_t)*q) {
matches = false;
break;
}
}
return matches;
} else {
return false;
}
}
char32_t syntax_matching_bracket(Language lang, char32_t c) {
if (lang == LANG_HTML || lang == LANG_XML) {
// for most languages, this would look weird since
// v cursor
// if (x < 5 && y >| 6)
// ^ this will be highlighted as a "matching bracket"
// but for HTML this is nice
switch (c) {
case '<': return '>';
case '>': return '<';
}
}
switch (c) {
case '(': return ')';
case ')': return '(';
case '[': return ']';
case ']': return '[';
case '{': return '}';
case '}': return '{';
}
return 0;
}
bool syntax_is_opening_bracket(Language lang, char32_t c) {
if (lang == LANG_HTML || lang == LANG_XML) {
if (c == '<')
return true;
}
switch (c) {
case '(':
case '[':
case '{':
return true;
}
return false;
}
// lookup the given string in the keywords table
static const Keyword *syntax_keyword_lookup(const KeywordList *all_keywords, const char32_t *str, size_t len) {
if (!len) return NULL;
const KeywordList *list = &all_keywords[str[0] % 128];
const Keyword *keywords = list->keywords;
size_t nkeywords = list->len;
if (keywords) {
for (size_t k = 0; k < nkeywords; ++k) {
if (syntax_keyword_matches(str, len, keywords[k].str)) {
return &keywords[k];
}
}
}
return NULL;
}
// fast function to figure out if something can be in a comment keyword (like _TODO_)
static bool can_be_comment_keyword(char32_t c) {
return c < 128 && c >= 'A' && c <= 'Z';//fuck you ebcdic
}
// this is used to highlight comments across languages, for stuff like TODOs
static SyntaxCharType syntax_highlight_comment(const char32_t *line, u32 i, u32 line_len) {
assert(i < line_len);
if (!can_be_comment_keyword(line[i]))
return SYNTAX_COMMENT; // cannot be a keyword
u32 max_len = 10; // maximum length of any comment keyword
// find end of keyword
u32 end = i + 1;
while (end < line_len && i + max_len > end && is32_alpha(line[end])) {
if (!can_be_comment_keyword(line[end]))
return SYNTAX_COMMENT;
++end;
}
if (end < line_len && (line[end] == '_' || is32_digit(line[end])))
return SYNTAX_COMMENT;
// find start of keyword
u32 start = i;
while (start > 0 && start + max_len > i && is32_alpha(line[start])) {
if (!can_be_comment_keyword(line[start]))
return SYNTAX_COMMENT;
--start;
}
if (!is32_alpha(line[start]))
++start;
if (start > 0 && (line[start - 1] == '_' || is32_digit(line[start - 1])))
return SYNTAX_COMMENT;
// look it up
const Keyword *kwd = syntax_keyword_lookup(syntax_all_keywords_comment, &line[start], end - start);
if (kwd)
return kwd->type;
return SYNTAX_COMMENT;
}
// does i continue the number literal from i-1
static bool syntax_number_continues(Language lang, const char32_t *line, u32 line_len, u32 i) {
if (line[i] == '.') {
if ((i && line[i-1] == '.') || (i < line_len-1 && line[i+1] == '.'))
return false; // can't have two .s in a row
if (i < line_len-1 && lang == LANG_RUST && !isdigit(line[i+1]) && line[i+1] != '_') {
// don't highlight 0.into() weirdly
// (in Rust, only 0123456789_ can follow a decimal point)
return false;
}
}
if (lang == LANG_CSS) {
if (line[i] < 128 && isalpha((char)line[i])) {
// units
return true;
}
if (line[i] == '%') {
return true;
}
}
// for simplicity, we don't actually recognize integer suffixes.
// we just treat any letter in any suffix as a digit.
// so 1lllllllllbablalbal will be highlighted as a number in C,
// but that's not legal C anyways so it doesn't really matter.
const char *digits;
switch (lang) {
case LANG_RUST:
// note: the sz is for 1usize
digits = "0123456789.xXoObBuUiIszabcdefABCDEF_";
break;
case LANG_C:
case LANG_CPP:
digits = "0123456789.xXbBlLuUiIabcdefABCDEFpP'";
break;
case LANG_GLSL:
digits = "0123456789.xXbBlLuUabcdefABCDEF_";
break;
case LANG_GO:
digits = "0123456789.xXoObBabcdefABCDEFpPi_";
break;
case LANG_JAVASCRIPT:
case LANG_TYPESCRIPT:
digits = "0123456789.xXoObBabcdefABCDEFn_";
break;
default:
digits = "0123456789.xXoObBabcdefABCDEF_";
break;
}
return (line[i] < CHAR_MAX &&
(strchr(digits, (char)line[i])
|| (i && line[i-1] == 'e' && (line[i] == '+' || line[i] == '-'))));
}
static bool is_keyword(Language lang, char32_t c) {
if (c == '_' && lang == LANG_TEX) return false;
if (is32_word(c)) return true;
switch (lang) {
case LANG_RUST:
// Rust builtin macros
if (c == '!')
return true;
break;
case LANG_CSS:
if (c == '-' || c == '@' || c == '!')
return true;
break;
case LANG_HTML:
case LANG_XML:
if (c == '-' || c == '=')
return true;
break;
default: break;
}
return false;
}
// find how long this keyword would be (if this is a keyword)
static u32 syntax_keyword_len(Language lang, const char32_t *line, u32 i, u32 line_len) {
u32 keyword_end;
for (keyword_end = i; keyword_end < line_len; ++keyword_end) {
if (!is_keyword(lang, line[keyword_end]))
break;
}
if (lang == LANG_CSS && keyword_end < line_len && line[keyword_end] == ':') {
// in CSS we allow : at the end of keywords only
// this is so "font-family:" can be a keyword but "a:hover" is parsed as "a" ":hover"
if (keyword_end + 1 == line_len || (!is32_word(line[keyword_end + 1]) && line[keyword_end + 1] != ':')) {
++keyword_end;
}
}
return keyword_end - i;
}
// highlighting for C, C++, and GLSL
static void syntax_highlight_c_cpp(SyntaxState *state_ptr, const char32_t *line, u32 line_len, SyntaxCharType *char_types, Language lang) {
SyntaxState state = *state_ptr;
bool in_preprocessor = (state & SYNTAX_STATE_CPP_PREPROCESSOR) != 0;
bool in_string = (state & SYNTAX_STATE_CPP_STRING) != 0;
bool in_single_line_comment = (state & SYNTAX_STATE_CPP_SINGLE_LINE_COMMENT) != 0;
bool in_multi_line_comment = (state & SYNTAX_STATE_CPP_MULTI_LINE_COMMENT) != 0;
bool in_raw_string = (state & SYNTAX_STATE_CPP_RAW_STRING);
bool in_char = false;
bool in_number = false;
bool raw_string_ending = false;
int backslashes = 0;
for (u32 i = 0; i < line_len; ++i) {
// are there 1/2 characters left in the line?
bool has_1_char = i + 1 < line_len;
bool has_2_chars = i + 2 < line_len;
bool dealt_with = false;
char32_t c = line[i];
if (in_raw_string) {
if (has_2_chars && c == ')' && line[1] == '"') {
raw_string_ending = true;
}
if (char_types)
char_types[i] = SYNTAX_STRING;
if (raw_string_ending && c == '"')
in_raw_string = false;
dealt_with = true;
} else switch (c) {
case '#':
if (!in_single_line_comment && !in_multi_line_comment && !in_char && !in_string)
in_preprocessor = true;
break;
case '\\':
++backslashes;
break;
case '/':
if (!in_multi_line_comment && !in_single_line_comment && !in_string && !in_char && has_1_char) {
if (line[i + 1] == '/')
in_single_line_comment = true; // //
else if (line[i + 1] == '*')
in_multi_line_comment = true; // /*
} else if (in_multi_line_comment) {
if (i && line[i - 1] == '*') {
// */
in_multi_line_comment = false;
if (char_types) {
dealt_with = true;
char_types[i] = SYNTAX_COMMENT;
}
}
}
break;
case '"':
if (in_string && backslashes % 2 == 0) {
in_string = false;
if (char_types) {
dealt_with = true;
char_types[i] = SYNTAX_STRING;
}
} else if (!in_multi_line_comment && !in_single_line_comment && !in_char) {
in_string = true;
}
break;
case '\'':
if (in_char && backslashes % 2 == 0) {
in_char = false;
if (char_types) {
dealt_with = true;
char_types[i] = SYNTAX_CHARACTER;
}
} else if (!in_multi_line_comment && !in_single_line_comment && !in_string) {
if (i == 0 || !is32_digit(line[i-1])) // in C++, you can use ' as a separator, e.g. 1'000'000
in_char = true;
}
break;
case ANY_DIGIT:
// a number!
if (char_types && !in_single_line_comment && !in_multi_line_comment && !in_string && !in_number && !in_char) {
in_number = true;
if (i) {
if (line[i - 1] == '.') {
// support .6, for example
char_types[i - 1] = SYNTAX_CONSTANT;
} else if (is32_word(line[i - 1])) {
// actually, this isn't a number. it's something like a*6* or u3*2*.
in_number = false;
}
}
}
break;
default: {
if ((i && is32_word(line[i - 1])) || !is32_word(c))
break; // can't be a keyword on its own.
if (!in_single_line_comment && !in_multi_line_comment && !in_string && c == 'R' && has_2_chars && line[i + 1] == '"' && line[i + 2] == '(') {
// raw string
in_raw_string = true;
raw_string_ending = false;
break;
}
// keywords don't matter for advancing the state
if (char_types && !in_single_line_comment && !in_multi_line_comment && !in_number && !in_string && !in_preprocessor && !in_char) {
u32 keyword_len = syntax_keyword_len(lang, line, i, line_len);
Keyword const *keyword = NULL;
switch (lang) {
case LANG_CPP:
keyword = syntax_keyword_lookup(syntax_all_keywords_cpp, &line[i], keyword_len);
if (!keyword)
keyword = syntax_keyword_lookup(syntax_all_keywords_c, &line[i], keyword_len);
break;
case LANG_GLSL:
keyword = syntax_keyword_lookup(syntax_all_keywords_glsl, &line[i], keyword_len);
break;
default:
assert(lang == LANG_C);
keyword = syntax_keyword_lookup(syntax_all_keywords_c, &line[i], keyword_len);
break;
}
if (keyword) {
SyntaxCharType type = keyword->type;
for (size_t j = 0; j < keyword_len; ++j) {
char_types[i++] = type;
}
--i; // we'll increment i from the for loop
dealt_with = true;
break;
}
}
} break;
}
if (c != '\\') backslashes = 0;
if (in_number && !syntax_number_continues(lang, line, line_len, i)) {
in_number = false;
}
if (char_types && !dealt_with) {
SyntaxCharType type = SYNTAX_NORMAL;
if (in_single_line_comment || in_multi_line_comment)
type = syntax_highlight_comment(line, i, line_len);
else if (in_string)
type = SYNTAX_STRING;
else if (in_char)
type = SYNTAX_CHARACTER;
else if (in_number)
type = SYNTAX_CONSTANT;
else if (in_preprocessor)
type = SYNTAX_PREPROCESSOR;
char_types[i] = type;
}
}
*state_ptr = (SyntaxState)(
((backslashes && in_single_line_comment) * SYNTAX_STATE_CPP_SINGLE_LINE_COMMENT)
| ((backslashes && in_preprocessor) * SYNTAX_STATE_CPP_PREPROCESSOR)
| ((backslashes && in_string) * SYNTAX_STATE_CPP_STRING)
| (in_multi_line_comment * SYNTAX_STATE_CPP_MULTI_LINE_COMMENT)
| (in_raw_string * SYNTAX_STATE_CPP_RAW_STRING)
);
}
static void syntax_highlight_rust(SyntaxState *state, const char32_t *line, u32 line_len, SyntaxCharType *char_types) {
u32 comment_depth = (((u32)*state & SYNTAX_STATE_RUST_COMMENT_DEPTH_MASK) / SYNTAX_STATE_RUST_COMMENT_DEPTH_MUL);
bool in_string = (*state & SYNTAX_STATE_RUST_STRING) != 0;
bool string_is_raw = (*state & SYNTAX_STATE_RUST_STRING_IS_RAW) != 0;
bool in_number = false;
bool in_attribute = false;
int backslashes = 0;
int bracket_depth = 0;
for (u32 i = 0; i < line_len; ++i) {
char32_t c = line[i];
bool dealt_with = false;
bool has_1_char = i + 1 < line_len;
bool has_2_chars = i + 2 < line_len;
bool has_3_chars = i + 3 < line_len;
switch (c) {
case '/':
if (!in_string) {
if (i && line[i-1] == '*') {
// */
if (comment_depth)
--comment_depth;
if (char_types) {
char_types[i] = SYNTAX_COMMENT;
dealt_with = true;
}
} else if (has_1_char && line[i+1] == '*') {
// /*
++comment_depth;
} else if (!comment_depth && has_1_char && line[i+1] == '/') {
// //
// just handle it all now
if (char_types) {
for (u32 j = i; j < line_len; ++j)
char_types[j] = syntax_highlight_comment(line, j, line_len);
}
i = line_len - 1;
dealt_with = true;
break;
}
}
break;
case 'r':
if (char_types && !comment_depth) {
if (has_2_chars && line[i+1] == '#' && line[i+2] == '"') {
// r before raw string
char_types[i] = SYNTAX_STRING;
dealt_with = true;
}
}
goto keyword_check;
case 'b':
if (char_types && !comment_depth) {
if ((has_1_char && line[i+1] == '"')
|| (has_3_chars && line[i+1] == 'r' && line[i+2] == '#' && line[i+3] == '"')) {
// b before byte string
char_types[i] = SYNTAX_STRING;
dealt_with = true;
}
if (has_1_char && line[i+1] == '\'') {
// b before byte char
char_types[i] = SYNTAX_CHARACTER;
dealt_with = true;
}
}
goto keyword_check;
case '"':
if (!comment_depth) {
if (in_string) {
if (backslashes % 2 == 0) {
if (!string_is_raw || (has_1_char && line[i+1] == '#')) {
// end of string literal
in_string = false;
if (char_types) {
char_types[i] = SYNTAX_STRING;
dealt_with = true;
if (string_is_raw && has_1_char) {
// highlighting for final #
++i;
char_types[i] = SYNTAX_STRING;
}
}
string_is_raw = false;
}
}
} else {
// start of string literal
in_string = true;
if (i && line[i-1] == '#')
string_is_raw = true;
}
}
break;
case '\'': {
if (!comment_depth && !in_string && has_2_chars) {
// figure out if this is a character or a lifetime
u32 char_end;
backslashes = line[i+1] == '\\';
for (char_end = i + 2; char_end < line_len; ++char_end) {
if (line[char_end] == '\'' && backslashes % 2 == 0) {
break;
}
if (backslashes % 2 == 1 && line[char_end] == 'u'
&& char_end + 3 < line_len && line[char_end + 1] == '{') {
// unicode character literal e.g. '\u{1234}'
char_end += 2; // skip u{
while (char_end + 1 < line_len) {
char_end++;
if (line[char_end] == '}') {
char_end++;
break;
}
}
if (line[char_end - 1] != '}') {
// not a unicode character
char_end = line_len;
}
break;
}
if (line[char_end] < CHAR_MAX
&& backslashes % 2 == 0
&& !strchr("abcdefABCDEF0123456789", (char)line[char_end]))
break;
if (line[char_end] == '\\')
++backslashes;
else
backslashes = 0;
}
if (char_end < line_len && line[char_end] == '\'') {
// a character literal
if (char_types) {
for (u32 j = i; j <= char_end; ++j)
char_types[j] = SYNTAX_CHARACTER;
dealt_with = true;
}
i = char_end;
} else {
// a lifetime or something else
}
}
} break;
case '\\':
++backslashes;
break;
case ANY_DIGIT:
// a number!
if (char_types && !comment_depth && !in_string && !in_number) {
in_number = true;
if (i && (is32_word(line[i - 1])
|| (line[i-1] == '.' && !(i >= 2 && line[i-2] == '.')))
) {
// actually, this isn't a number. it's something like a*6* or u3*2*.
// also, don't highlight the 0 in tuple.0
in_number = false;
}
}
break;
case '[':
if (in_attribute && !in_string && !comment_depth) {
++bracket_depth;
}
break;
case ']':
if (in_attribute && !in_string && !comment_depth) {
--bracket_depth;
if (bracket_depth < 0) {
in_attribute = false;
}
}
break;
case '#':
if (char_types && !in_string && !comment_depth) {
if (i && line[i-1] == 'r') {
if (has_1_char && line[i+1] == '"') {
// raw string
char_types[i] = SYNTAX_STRING;
dealt_with = true;
} else {
// raw identifier
}
break;
}
if (!has_2_chars) break;
if (line[i+1] == '[' || (line[i+1] == '!' && line[i+2] == '[')) {
in_attribute = true;
bracket_depth = 0;
}
}
break;
default:
keyword_check: {
if ((i && is32_word(line[i - 1])) || !is32_word(c))
break; // can't be a keyword on its own.
if (i >= 2 && line[i-2] == 'r' && line[i-1] == '#') {
// raw identifier
break;
}
if (char_types && !in_string && !comment_depth && !in_number) {
u32 keyword_len = syntax_keyword_len(LANG_RUST, line, i, line_len);
Keyword const *keyword = syntax_keyword_lookup(syntax_all_keywords_rust, &line[i], keyword_len);
if (keyword) {
SyntaxCharType type = keyword->type;
for (size_t j = 0; j < keyword_len; ++j) {
char_types[i++] = type;
}
--i; // we'll increment i from the for loop
dealt_with = true;
break;
}
}
} break;
}
if (c != '\\') backslashes = 0;
if (in_number && !syntax_number_continues(LANG_RUST, line, line_len, i))
in_number = false;
if (char_types && !dealt_with) {
SyntaxCharType type = SYNTAX_NORMAL;
if (comment_depth) {
type = syntax_highlight_comment(line, i, line_len);
} else if (in_string) {
type = SYNTAX_STRING;
} else if (in_number) {
type = SYNTAX_CONSTANT;
} else if (in_attribute) {
type = SYNTAX_PREPROCESSOR;
}
char_types[i] = type;
}
}
u32 max_comment_depth = ((u32)1<<SYNTAX_STATE_RUST_COMMENT_DEPTH_BITS);
if (comment_depth >= max_comment_depth)
comment_depth = max_comment_depth;
*state = (SyntaxState)(
(comment_depth * SYNTAX_STATE_RUST_COMMENT_DEPTH_MUL)
| (in_string * SYNTAX_STATE_RUST_STRING)
| (string_is_raw * SYNTAX_STATE_RUST_STRING_IS_RAW)
);
}
static void syntax_highlight_python(SyntaxState *state, const char32_t *line, u32 line_len, SyntaxCharType *char_types) {
(void)state;
bool in_string = (*state & SYNTAX_STATE_PYTHON_STRING) != 0;
bool string_is_dbl_quoted = (*state & SYNTAX_STATE_PYTHON_STRING_DBL_QUOTED) != 0;
bool string_is_multiline = true;
bool in_number = false;
u32 backslashes = 0;
for (u32 i = 0; i < line_len; ++i) {
char32_t c = line[i];
bool dealt_with = false;
switch (c) {
case '#':
if (!in_string) {
// comment
if (char_types) {
for (u32 j = i; j < line_len; ++j)
char_types[j] = syntax_highlight_comment(line, j, line_len);
dealt_with = true;
}
i = line_len - 1;
}
break;
case 'f':
case 'r':
case 'b':
if (char_types && i+1 < line_len && (line[i+1] == '\'' || line[i+1] == '"')) {
// format/raw/byte string
// @TODO(eventually): we don't handle raw string highlighting correctly.
char_types[i] = SYNTAX_STRING;
dealt_with = true;
}
goto keyword_check;
case '\'':
case '"': {
bool dbl_quoted = c == '"';
bool is_triple = i+2 < line_len &&
line[i+1] == c && line[i+2] == c;
if (in_string) {
if (!string_is_multiline || is_triple) {
if (string_is_dbl_quoted == dbl_quoted && backslashes % 2 == 0) {
// end of string
in_string = false;
if (char_types) {
char_types[i] = SYNTAX_STRING;
if (string_is_multiline) {
// highlight all three ending quotes
char_types[++i] = SYNTAX_STRING;
char_types[++i] = SYNTAX_STRING;
}
dealt_with = true;
}
}
}
} else {
// start of string
string_is_dbl_quoted = dbl_quoted;
in_string = true;
string_is_multiline = is_triple;
}
} break;
case ANY_DIGIT:
if (char_types && !in_string && !in_number) {
in_number = true;
if (i) {
if (line[i - 1] == '.') {
// support .6, for example
char_types[i - 1] = SYNTAX_CONSTANT;
} else if (is32_word(line[i - 1])) {
// actually, this isn't a number. it's something like a*6* or u3*2*.
in_number = false;
}
}
}
break;
case '\\':
++backslashes;
break;
default:
keyword_check:
if ((i && is32_word(line[i - 1])) || !is32_word(c))
break; // can't be a keyword on its own.
if (char_types && !in_string && !in_number) {
u32 keyword_len = syntax_keyword_len(LANG_PYTHON, line, i, line_len);
Keyword const *keyword = syntax_keyword_lookup(syntax_all_keywords_python, &line[i], keyword_len);
if (keyword) {
SyntaxCharType type = keyword->type;
for (size_t j = 0; j < keyword_len; ++j) {
char_types[i++] = type;
}
--i; // we'll increment i from the for loop
dealt_with = true;
break;
}
}
break;
}
if (c != '\\') backslashes = 0;
if (in_number && !syntax_number_continues(LANG_PYTHON, line, line_len, i))
in_number = false;
if (char_types && !dealt_with) {
SyntaxCharType type = SYNTAX_NORMAL;
if (in_string)
type = SYNTAX_STRING;
else if (in_number)
type = SYNTAX_CONSTANT;
char_types[i] = type;
}
}
*state = 0;
if (in_string && string_is_multiline) {
*state |= (SyntaxState)(
SYNTAX_STATE_PYTHON_STRING
| (SYNTAX_STATE_PYTHON_STRING_DBL_QUOTED * string_is_dbl_quoted)
);
}
}
static bool is_tex_ident(char32_t c) {
// digits and underscores cannot appear in tex identifiers
return is32_word(c) && !is32_digit(c) && c != '_';
}
static void syntax_highlight_tex(SyntaxState *state, const 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 = (char32_t *)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_highlight_comment(line, i, line_len);
}
}
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)
);
}
static void syntax_highlight_markdown(SyntaxState *state, const 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) // NOTE: memset is used extensively in this file this way
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;
const char *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) {