feat: add syntax highlighting to edit command
This commit is contained in:
@@ -0,0 +1,497 @@
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/*
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* syntax_ansi.hpp
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* ANSI terminal syntax highlighting for C and Lua
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* Used by the MontaukOS CLI text editor
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* Copyright (c) 2026 Daniel Hammer
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*/
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#pragma once
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#include <stdint.h>
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// ============================================================================
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// Token types
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// ============================================================================
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enum SynLanguage : uint8_t {
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SYN_LANG_NONE,
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SYN_LANG_C,
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SYN_LANG_LUA,
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};
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enum SynToken : uint8_t {
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SYN_NORMAL,
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SYN_KEYWORD,
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SYN_TYPE,
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SYN_PREPROCESSOR,
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SYN_STRING,
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SYN_CHAR,
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SYN_COMMENT,
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SYN_NUMBER,
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SYN_OPERATOR,
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};
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struct SynState {
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int in_block_comment; // 0 or 1 (bool stored as int for freestanding)
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SynToken long_token;
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int long_bracket_eqs;
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};
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// ============================================================================
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// Helpers
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// ============================================================================
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inline bool syn_is_alpha(char c) {
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return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_';
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}
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inline bool syn_is_alnum(char c) {
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return syn_is_alpha(c) || (c >= '0' && c <= '9');
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}
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inline bool syn_is_digit(char c) {
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return c >= '0' && c <= '9';
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}
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inline bool syn_is_hex(char c) {
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return syn_is_digit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
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}
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inline void syn_set_token(SynToken* out, int out_len, int idx, SynToken tok) {
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if (out && idx >= 0 && idx < out_len)
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out[idx] = tok;
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}
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inline void syn_fill_tokens(SynToken* out, int out_len, int start, int end, SynToken tok) {
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if (!out) return;
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if (start < 0) start = 0;
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if (end > out_len) end = out_len;
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for (int i = start; i < end; i++)
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out[i] = tok;
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}
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inline bool syn_streq(const char* buf, int len, const char* kw) {
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int i = 0;
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while (i < len && kw[i]) {
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if (buf[i] != kw[i]) return false;
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i++;
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}
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return i == len && kw[i] == '\0';
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}
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// ============================================================================
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// Keyword / type classification
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// ============================================================================
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inline SynToken syn_classify_c_word(const char* buf, int len) {
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static const char* keywords[] = {
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"auto", "break", "case", "const", "continue", "default", "do",
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"else", "enum", "extern", "for", "goto", "if", "inline",
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"register", "restrict", "return", "sizeof", "static", "struct",
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"switch", "typedef", "union", "volatile", "while",
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"NULL", "true", "false", "nullptr",
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};
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static const char* types[] = {
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"void", "char", "short", "int", "long", "float", "double",
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"signed", "unsigned", "bool", "_Bool",
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"int8_t", "int16_t", "int32_t", "int64_t",
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"uint8_t", "uint16_t", "uint32_t", "uint64_t",
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"size_t", "ssize_t", "ptrdiff_t", "intptr_t", "uintptr_t",
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"FILE",
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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(types) / sizeof(types[0])); i++) {
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if (syn_streq(buf, len, types[i])) return SYN_TYPE;
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}
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return SYN_NORMAL;
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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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inline SynToken syn_classify_word(SynLanguage lang, const char* buf, int len) {
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switch (lang) {
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case SYN_LANG_C: return syn_classify_c_word(buf, len);
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case SYN_LANG_LUA: return syn_classify_lua_word(buf, len);
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default: return SYN_NORMAL;
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}
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}
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inline SynState syn_make_state() {
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SynState state = {};
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state.in_block_comment = 0;
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state.long_token = SYN_NORMAL;
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state.long_bracket_eqs = -1;
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return state;
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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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// Number consumption
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// ============================================================================
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inline void syn_consume_number(const char* line, int len, int& i,
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SynToken* out, int out_len, int c_style_suffixes) {
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int start = i;
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if (line[i] == '0' && i + 1 < len && (line[i + 1] == 'x' || line[i + 1] == 'X')) {
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i += 2;
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while (i < len && syn_is_hex(line[i])) i++;
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if (i < len && line[i] == '.' && !(i + 1 < len && line[i + 1] == '.')) {
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i++;
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while (i < len && syn_is_hex(line[i])) i++;
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}
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if (i < len && (line[i] == 'p' || line[i] == 'P')) {
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int exp = i + 1;
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if (exp < len && (line[exp] == '+' || line[exp] == '-')) exp++;
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if (exp < len && syn_is_digit(line[exp])) {
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i = exp + 1;
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while (i < len && syn_is_digit(line[i])) i++;
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}
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}
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} else {
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if (line[i] == '.') i++;
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while (i < len && syn_is_digit(line[i])) i++;
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if (i < len && line[i] == '.' && !(i + 1 < len && line[i + 1] == '.')) {
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i++;
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while (i < len && syn_is_digit(line[i])) i++;
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}
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if (i < len && (line[i] == 'e' || line[i] == 'E')) {
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int exp = i + 1;
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if (exp < len && (line[exp] == '+' || line[exp] == '-')) exp++;
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if (exp < len && syn_is_digit(line[exp])) {
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i = exp + 1;
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while (i < len && syn_is_digit(line[i])) i++;
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}
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}
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}
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if (c_style_suffixes) {
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while (i < len && (line[i] == 'u' || line[i] == 'U' ||
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line[i] == 'l' || line[i] == 'L' ||
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line[i] == 'f' || line[i] == 'F'))
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i++;
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}
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syn_fill_tokens(out, out_len, start, i, SYN_NUMBER);
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}
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// ============================================================================
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// C highlighting
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// ============================================================================
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inline void syn_highlight_line_c(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.in_block_comment) {
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while (i < len) {
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if (i + 1 < len && line[i] == '*' && line[i + 1] == '/') {
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syn_set_token(out, out_len, i, SYN_COMMENT);
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syn_set_token(out, out_len, i + 1, SYN_COMMENT);
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i += 2;
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state.in_block_comment = 0;
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break;
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}
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syn_set_token(out, out_len, i, SYN_COMMENT);
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i++;
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}
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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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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 == '/' && i + 1 < len && line[i + 1] == '*') {
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state.in_block_comment = 1;
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syn_set_token(out, out_len, i, SYN_COMMENT);
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syn_set_token(out, out_len, i + 1, SYN_COMMENT);
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i += 2;
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continue;
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}
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if (c == '#') {
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int is_pp = 1;
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for (int j = 0; j < i; j++) {
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if (line[j] != ' ' && line[j] != '\t') { is_pp = 0; break; }
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}
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if (is_pp) {
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while (i < len) {
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if (i + 1 < len && line[i] == '/' && line[i + 1] == '/') {
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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 (i + 1 < len && line[i] == '/' && line[i + 1] == '*') {
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state.in_block_comment = 1;
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syn_set_token(out, out_len, i, SYN_COMMENT);
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syn_set_token(out, out_len, i + 1, SYN_COMMENT);
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i += 2;
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while (i < len) {
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if (i + 1 < len && line[i] == '*' && line[i + 1] == '/') {
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syn_set_token(out, out_len, i, SYN_COMMENT);
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syn_set_token(out, out_len, i + 1, SYN_COMMENT);
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i += 2;
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state.in_block_comment = 0;
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break;
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}
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syn_set_token(out, out_len, i, SYN_COMMENT);
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i++;
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}
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continue;
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}
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syn_set_token(out, out_len, i, SYN_PREPROCESSOR);
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i++;
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}
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continue;
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}
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}
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if (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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if (line[i] == '"') {
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syn_set_token(out, out_len, i, SYN_STRING);
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i++;
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break;
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}
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syn_set_token(out, out_len, i, SYN_STRING);
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i++;
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}
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continue;
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}
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if (c == '\'') {
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syn_set_token(out, out_len, i, SYN_CHAR);
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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_CHAR);
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syn_set_token(out, out_len, i + 1, SYN_CHAR);
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i += 2;
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continue;
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}
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if (line[i] == '\'') {
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syn_set_token(out, out_len, i, SYN_CHAR);
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i++;
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break;
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}
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syn_set_token(out, out_len, i, SYN_CHAR);
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i++;
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}
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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, 1);
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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_C, 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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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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// ============================================================================
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// Lua highlighting
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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 == '>' ||
|
||||
c == '~' || c == ':' || c == '.' || c == ',' || c == ';' ||
|
||||
c == '(' || c == ')' || c == '{' || c == '}' ||
|
||||
c == '[' || c == ']') {
|
||||
syn_set_token(out, out_len, i, SYN_OPERATOR);
|
||||
i++;
|
||||
continue;
|
||||
}
|
||||
syn_set_token(out, out_len, i, SYN_NORMAL);
|
||||
i++;
|
||||
}
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Per-line highlighter
|
||||
// ============================================================================
|
||||
|
||||
inline void syn_highlight_line(const char* line, int len, SynToken* out, int out_len,
|
||||
SynLanguage lang, SynState& state) {
|
||||
if (!line || len <= 0) return;
|
||||
switch (lang) {
|
||||
case SYN_LANG_C:
|
||||
syn_highlight_line_c(line, len, out, out_len, state);
|
||||
break;
|
||||
case SYN_LANG_LUA:
|
||||
syn_highlight_line_lua(line, len, out, out_len, state);
|
||||
break;
|
||||
default:
|
||||
syn_fill_tokens(out, out_len, 0, len, SYN_NORMAL);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Language detection
|
||||
// ============================================================================
|
||||
|
||||
inline bool syn_path_ends_with(const char* path, const char* suffix) {
|
||||
if (!path || !suffix) return false;
|
||||
int path_len = 0;
|
||||
while (path[path_len]) path_len++;
|
||||
int suffix_len = 0;
|
||||
while (suffix[suffix_len]) suffix_len++;
|
||||
if (path_len < suffix_len) return false;
|
||||
for (int i = 0; i < suffix_len; i++) {
|
||||
if (path[path_len - suffix_len + i] != suffix[i])
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
inline SynLanguage syn_detect_language(const char* filepath) {
|
||||
if (!filepath || filepath[0] == '\0') return SYN_LANG_NONE;
|
||||
if (syn_path_ends_with(filepath, ".c") || syn_path_ends_with(filepath, ".h"))
|
||||
return SYN_LANG_C;
|
||||
if (syn_path_ends_with(filepath, ".lua"))
|
||||
return SYN_LANG_LUA;
|
||||
return SYN_LANG_NONE;
|
||||
}
|
||||
Reference in New Issue
Block a user