feat: refactor syntax higlighting support in edit.elf/Text Editor, add highlighting for html, css, js
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/*
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* lang_lua.hpp
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* Lua highlighting
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* Shared by the MontaukOS text editor (GUI) and edit.elf (CLI)
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* Copyright (c) 2026 Daniel Hammer
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*/
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// Included by <syntax/syntax.hpp>; not standalone.
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#pragma once
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// ============================================================================
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// Keyword / builtin classification
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// ============================================================================
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inline SynToken syn_classify_lua_word(const char* buf, int len) {
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static const char* keywords[] = {
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"and", "break", "do", "else", "elseif", "end", "false",
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"for", "function", "goto", "if", "in", "local", "nil",
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"not", "or", "repeat", "return", "then", "true",
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"until", "while",
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};
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static const char* builtins[] = {
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"_ENV", "_G", "_VERSION",
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"assert", "collectgarbage", "coroutine", "debug", "dofile",
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"error", "getmetatable", "io", "ipairs", "load", "loadfile",
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"math", "next", "os", "package", "pairs", "pcall",
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"print", "rawequal", "rawget", "rawlen", "rawset", "require",
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"select", "setmetatable", "string", "table", "tonumber",
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"tostring", "type", "utf8", "warn", "xpcall",
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};
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for (int i = 0; i < (int)(sizeof(keywords) / sizeof(keywords[0])); i++) {
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if (syn_streq(buf, len, keywords[i])) return SYN_KEYWORD;
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}
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for (int i = 0; i < (int)(sizeof(builtins) / sizeof(builtins[0])); i++) {
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if (syn_streq(buf, len, builtins[i])) return SYN_TYPE;
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}
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return SYN_NORMAL;
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}
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// ============================================================================
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// Lua long bracket matching
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// ============================================================================
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inline bool syn_match_lua_long_bracket_open(const char* line, int len, int i,
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int& eqs, int& span) {
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if (i >= len || line[i] != '[') return false;
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int j = i + 1;
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while (j < len && line[j] == '=') j++;
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if (j < len && line[j] == '[') {
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eqs = j - i - 1;
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span = j - i + 1;
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return true;
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}
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return false;
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}
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inline bool syn_match_lua_long_bracket_close(const char* line, int len, int i,
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int eqs, int& span) {
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if (i >= len || line[i] != ']') return false;
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int j = i + 1;
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for (int k = 0; k < eqs; k++) {
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if (j >= len || line[j] != '=') return false;
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j++;
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}
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if (j < len && line[j] == ']') {
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span = j - i + 1;
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return true;
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}
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return false;
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}
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// ============================================================================
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// Per-line highlighter
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// ============================================================================
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inline void syn_highlight_line_lua(const char* line, int len, SynToken* out, int out_len,
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SynState& state) {
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int i = 0;
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while (i < len) {
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if (state.long_token != SYN_NORMAL) {
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int span = 0;
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if (syn_match_lua_long_bracket_close(line, len, i, state.long_bracket_eqs, span)) {
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syn_fill_tokens(out, out_len, i, i + span, state.long_token);
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i += span;
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state.long_token = SYN_NORMAL;
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state.long_bracket_eqs = -1;
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continue;
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}
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syn_set_token(out, out_len, i, state.long_token);
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i++;
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continue;
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}
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char c = line[i];
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if (c == '-' && i + 1 < len && line[i + 1] == '-') {
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int eqs = 0;
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int span = 0;
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if (i + 2 < len && syn_match_lua_long_bracket_open(line, len, i + 2, eqs, span)) {
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syn_fill_tokens(out, out_len, i, i + 2 + span, SYN_COMMENT);
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i += 2 + span;
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state.long_token = SYN_COMMENT;
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state.long_bracket_eqs = eqs;
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continue;
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}
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syn_fill_tokens(out, out_len, i, len, SYN_COMMENT);
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break;
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}
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if (c == '"' || c == '\'') {
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char quote = c;
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syn_set_token(out, out_len, i, SYN_STRING);
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i++;
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while (i < len) {
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if (line[i] == '\\' && i + 1 < len) {
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syn_set_token(out, out_len, i, SYN_STRING);
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syn_set_token(out, out_len, i + 1, SYN_STRING);
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i += 2;
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continue;
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}
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syn_set_token(out, out_len, i, SYN_STRING);
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if (line[i] == quote) {
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i++;
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break;
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}
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i++;
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}
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continue;
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}
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int eqs = 0;
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int span = 0;
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if (syn_match_lua_long_bracket_open(line, len, i, eqs, span)) {
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syn_fill_tokens(out, out_len, i, i + span, SYN_STRING);
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i += span;
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state.long_token = SYN_STRING;
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state.long_bracket_eqs = eqs;
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continue;
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}
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if (syn_is_digit(c) || (c == '.' && i + 1 < len && syn_is_digit(line[i + 1]))) {
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syn_consume_number(line, len, i, out, out_len, 0);
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continue;
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}
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if (syn_is_alpha(c)) {
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int start = i;
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while (i < len && syn_is_alnum(line[i])) i++;
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SynToken tok = syn_classify_word(SYN_LANG_LUA, line + start, i - start);
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syn_fill_tokens(out, out_len, start, i, tok);
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continue;
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}
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if (c == '+' || c == '-' || c == '*' || c == '/' || c == '%' ||
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c == '^' || c == '#' || c == '=' || c == '<' || c == '>' ||
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c == '~' || c == ':' || c == '.' || c == ',' || c == ';' ||
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c == '(' || c == ')' || c == '{' || c == '}' ||
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c == '[' || c == ']') {
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syn_set_token(out, out_len, i, SYN_OPERATOR);
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i++;
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continue;
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}
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syn_set_token(out, out_len, i, SYN_NORMAL);
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i++;
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}
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}
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