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Extract lexer and switch token metadata to helpers

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This commit is contained in:
Krzosa Karol
2026-05-12 08:42:11 +02:00
parent df7f1f27a1
commit 4cffa1f69a
4 changed files with 336 additions and 330 deletions
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194
lex.c Normal file
View File

@@ -0,0 +1,194 @@
typedef struct Token {
Token_Kind kind;
char *str;
int len;
char *file;
int line, column;
union {
uint64_t u;
};
} Token;
typedef Vec(Token) Token_Array;
typedef struct Lexer {
char *at;
char *end;
char *file;
int line;
int column;
} Lexer;
void lex_advance(Lexer *lex) {
if (lex->at >= lex->end) {
return;
}
if (*lex->at == '\n') {
lex->line++;
lex->column = 0;
} else {
lex->column++;
}
lex->at += 1;
}
void eat_whitespace(Lexer *lex) {
while (lex->at < lex->end) {
switch (*lex->at) {
case ' ':
case '\t':
case '\r':
case '\n':
lex_advance(lex);
break;
default:
return;
}
}
}
Lexer make_lexer(char *file, char *src, int len) {
Lexer lex = {
.at = src,
.end = src + len,
.file = file,
.line = 0,
.column = 0,
};
return lex;
}
bool lex_peek_is(Lexer *lex, char c) {
return lex->at < lex->end && *lex->at == c;
}
bool lex_match(Lexer *lex, char c) {
if (lex_peek_is(lex, c)) {
lex_advance(lex);
return true;
}
return false;
}
Token_Kind lex_repeat_or_assign(Lexer *lex, char repeated_char, Token_Kind single, Token_Kind repeated, Token_Kind assigned) {
if (lex_match(lex, repeated_char)) return repeated;
if (lex_match(lex, '=')) return assigned;
return single;
}
Token_Kind lex_assign_variant(Lexer *lex, Token_Kind single, Token_Kind assigned) {
return lex_match(lex, '=') ? assigned : single;
}
Token_Kind lex_shift_family(Lexer *lex, char repeated_char, Token_Kind single, Token_Kind single_eq, Token_Kind doubled, Token_Kind doubled_eq) {
if (lex_match(lex, repeated_char)) {
return lex_match(lex, '=') ? doubled_eq : doubled;
}
return lex_match(lex, '=') ? single_eq : single;
}
Token lex_token(Lexer *lex) {
eat_whitespace(lex);
Token t = {
.str = lex->at,
.line = lex->line,
.column = lex->column,
.file = lex->file,
};
if (lex->at >= lex->end) {
t.kind = TOK_EOF;
t.len = 0;
return t;
}
char c = *lex->at;
if (isdigit(c)) {
t.kind = TOK_INT;
while (lex->at < lex->end && isdigit(*lex->at)) {
lex_advance(lex);
}
// @todo: proper lexing of floats (as well as postfixes)
if (lex->at < lex->end && *lex->at == '.') {
t.kind = TOK_FLOAT;
lex_advance(lex);
while (lex->at < lex->end && isdigit(*lex->at)) {
lex_advance(lex);
}
}
if (t.kind == TOK_INT) {
t.u = strtoull(t.str, NULL, 10);
}
t.len = (int)(lex->at - t.str);
return t;
}
lex_advance(lex);
switch (c) {
case 0: t.kind = TOK_EOF; break;
case '(': t.kind = TOK_LPAREN; break;
case ')': t.kind = TOK_RPAREN; break;
case '[': t.kind = TOK_LBRACKET; break;
case ']': t.kind = TOK_RBRACKET; break;
case '{': t.kind = TOK_LBRACE; break;
case '}': t.kind = TOK_RBRACE; break;
case ',': t.kind = TOK_COMMA; break;
case '.': t.kind = TOK_DOT; break;
case ':': t.kind = TOK_COLON; break;
case ';': t.kind = TOK_SEMICOLON; break;
case '?': t.kind = TOK_QUESTION; break;
case '#': t.kind = TOK_HASH; break;
case '+': t.kind = lex_repeat_or_assign(lex, '+', TOK_PLUS, TOK_INC, TOK_PLUS_ASSIGN); break;
case '-': {
if (lex_match(lex, '-')) t.kind = TOK_DEC;
else if (lex_match(lex, '=')) t.kind = TOK_MINUS_ASSIGN;
else if (lex_match(lex, '>')) t.kind = TOK_ARROW;
else t.kind = TOK_MINUS;
} break;
case '*': t.kind = lex_assign_variant(lex, TOK_STAR, TOK_MUL_ASSIGN); break;
case '/': t.kind = lex_assign_variant(lex, TOK_SLASH, TOK_DIV_ASSIGN); break;
case '%': t.kind = lex_assign_variant(lex, TOK_PERCENT, TOK_MOD_ASSIGN); break;
case '=': t.kind = lex_assign_variant(lex, TOK_ASSIGN, TOK_EQ); break;
case '<': t.kind = lex_shift_family(lex, '<', TOK_LT, TOK_LEQ, TOK_LSHIFT, TOK_LSHIFT_ASSIGN); break;
case '>': t.kind = lex_shift_family(lex, '>', TOK_GT, TOK_GEQ, TOK_RSHIFT, TOK_RSHIFT_ASSIGN); break;
case '!': t.kind = lex_assign_variant(lex, TOK_NOT, TOK_NEQ); break;
case '~': t.kind = TOK_BITNOT; break;
case '&': t.kind = lex_repeat_or_assign(lex, '&', TOK_BITAND, TOK_AND, TOK_AND_ASSIGN); break;
case '|': t.kind = lex_repeat_or_assign(lex, '|', TOK_BITOR, TOK_OR, TOK_OR_ASSIGN); break;
case '^': t.kind = lex_assign_variant(lex, TOK_BITXOR, TOK_XOR_ASSIGN); break;
default: panicf("unrecognized character: '%c', can't match with any of the token kinds", c);
}
t.len = (int)(lex->at - t.str);
return t;
}
void assert_token(Token t, Token_Kind kind, char *text, int line, int column) {
assert(t.kind == kind);
assert(t.line == line);
assert(t.column == column);
assert(t.len == (int)strlen(text));
assert(strncmp(t.str, text, t.len) == 0);
}
Token_Array lex_file(char *file, char *src, int len) {
Lexer lex = make_lexer(file, src, len);
Token_Array result = {0};
for (;;) {
Token token = lex_token(&lex);
vec_push(&result, token);
if (token.kind == TOK_EOF) {
break;
}
}
return result;
}

232
main.c
View File

@@ -8,206 +8,7 @@
#include <stdarg.h>
#include "base.c"
#include "meta_gen.c"
typedef struct Token {
Token_Kind kind;
char *str;
int len;
char *file;
int line, column;
union {
uint64_t u;
};
} Token;
typedef Vec(Token) Token_Array;
typedef struct Lexer {
char *at;
char *end;
char *file;
int line;
int column;
} Lexer;
void lex_advance(Lexer *lex) {
if (lex->at >= lex->end) {
return;
}
if (*lex->at == '\n') {
lex->line++;
lex->column = 0;
} else {
lex->column++;
}
lex->at += 1;
}
void eat_whitespace(Lexer *lex) {
while (lex->at < lex->end) {
switch (*lex->at) {
case ' ':
case '\t':
case '\r':
case '\n':
lex_advance(lex);
break;
default:
return;
}
}
}
Lexer make_lexer(char *file, char *src, int len) {
Lexer lex = {
.at = src,
.end = src + len,
.file = file,
.line = 0,
.column = 0,
};
return lex;
}
bool lex_peek_is(Lexer *lex, char c) {
return lex->at < lex->end && *lex->at == c;
}
bool lex_match(Lexer *lex, char c) {
if (lex_peek_is(lex, c)) {
lex_advance(lex);
return true;
}
return false;
}
Token_Kind lex_repeat_or_assign(Lexer *lex, char repeated_char, Token_Kind single, Token_Kind repeated, Token_Kind assigned) {
if (lex_match(lex, repeated_char)) return repeated;
if (lex_match(lex, '=')) return assigned;
return single;
}
Token_Kind lex_assign_variant(Lexer *lex, Token_Kind single, Token_Kind assigned) {
return lex_match(lex, '=') ? assigned : single;
}
Token_Kind lex_shift_family(Lexer *lex, char repeated_char, Token_Kind single, Token_Kind single_eq, Token_Kind doubled, Token_Kind doubled_eq) {
if (lex_match(lex, repeated_char)) {
return lex_match(lex, '=') ? doubled_eq : doubled;
}
return lex_match(lex, '=') ? single_eq : single;
}
Token lex_token(Lexer *lex) {
eat_whitespace(lex);
Token t = {
.str = lex->at,
.line = lex->line,
.column = lex->column,
.file = lex->file,
};
if (lex->at >= lex->end) {
t.kind = TOK_EOF;
t.len = 0;
return t;
}
char c = *lex->at;
if (isdigit(c)) {
t.kind = TOK_INT;
while (lex->at < lex->end && isdigit(*lex->at)) {
lex_advance(lex);
}
// @todo: proper lexing of floats (as well as postfixes)
if (lex->at < lex->end && *lex->at == '.') {
t.kind = TOK_FLOAT;
lex_advance(lex);
while (lex->at < lex->end && isdigit(*lex->at)) {
lex_advance(lex);
}
}
if (t.kind == TOK_INT) {
t.u = strtoull(t.str, NULL, 10);
}
t.len = (int)(lex->at - t.str);
return t;
}
lex_advance(lex);
switch (c) {
case 0: t.kind = TOK_EOF; break;
case '(': t.kind = TOK_LPAREN; break;
case ')': t.kind = TOK_RPAREN; break;
case '[': t.kind = TOK_LBRACKET; break;
case ']': t.kind = TOK_RBRACKET; break;
case '{': t.kind = TOK_LBRACE; break;
case '}': t.kind = TOK_RBRACE; break;
case ',': t.kind = TOK_COMMA; break;
case '.': t.kind = TOK_DOT; break;
case ':': t.kind = TOK_COLON; break;
case ';': t.kind = TOK_SEMICOLON; break;
case '?': t.kind = TOK_QUESTION; break;
case '#': t.kind = TOK_HASH; break;
case '+': t.kind = lex_repeat_or_assign(lex, '+', TOK_PLUS, TOK_INC, TOK_PLUS_ASSIGN); break;
case '-': {
if (lex_match(lex, '-')) t.kind = TOK_DEC;
else if (lex_match(lex, '=')) t.kind = TOK_MINUS_ASSIGN;
else if (lex_match(lex, '>')) t.kind = TOK_ARROW;
else t.kind = TOK_MINUS;
} break;
case '*': t.kind = lex_assign_variant(lex, TOK_STAR, TOK_MUL_ASSIGN); break;
case '/': t.kind = lex_assign_variant(lex, TOK_SLASH, TOK_DIV_ASSIGN); break;
case '%': t.kind = lex_assign_variant(lex, TOK_PERCENT, TOK_MOD_ASSIGN); break;
case '=': t.kind = lex_assign_variant(lex, TOK_ASSIGN, TOK_EQ); break;
case '<': t.kind = lex_shift_family(lex, '<', TOK_LT, TOK_LEQ, TOK_LSHIFT, TOK_LSHIFT_ASSIGN); break;
case '>': t.kind = lex_shift_family(lex, '>', TOK_GT, TOK_GEQ, TOK_RSHIFT, TOK_RSHIFT_ASSIGN); break;
case '!': t.kind = lex_assign_variant(lex, TOK_NOT, TOK_NEQ); break;
case '~': t.kind = TOK_BITNOT; break;
case '&': t.kind = lex_repeat_or_assign(lex, '&', TOK_BITAND, TOK_AND, TOK_AND_ASSIGN); break;
case '|': t.kind = lex_repeat_or_assign(lex, '|', TOK_BITOR, TOK_OR, TOK_OR_ASSIGN); break;
case '^': t.kind = lex_assign_variant(lex, TOK_BITXOR, TOK_XOR_ASSIGN); break;
default: {
// @todo: lexer perhaps should have a static buffer of size 1024, error message
// should be put there and piped to the upper program. The token should be filled
// with that message
t.kind = TOK_ERROR;
}
}
t.len = (int)(lex->at - t.str);
return t;
}
void assert_token(Token t, Token_Kind kind, char *text, int line, int column) {
assert(t.kind == kind);
assert(t.line == line);
assert(t.column == column);
assert(t.len == (int)strlen(text));
assert(strncmp(t.str, text, t.len) == 0);
}
Token_Array lex_file(char *file, char *src, int len) {
Lexer lex = make_lexer(file, src, len);
Token_Array result = {0};
for (;;) {
Token token = lex_token(&lex);
vec_push(&result, token);
if (token.kind == TOK_EOF) {
break;
}
}
return result;
}
#include "lex.c"
typedef struct Parser {
Token *at;
@@ -256,7 +57,7 @@ Token *expect_token(Parser *p, Token_Kind kind) {
if (p->at->kind == kind) {
return next_token(p);
}
panicf("expected token kind: %s, got instead: %s", token_to_name[p->at->kind], token_to_name[kind]);
panicf("expected token kind: %s, got instead: %s", token_to_name(p->at->kind), token_to_name(kind));
}
Ast *create_ast(Token *token, Ast_Kind kind) {
@@ -287,7 +88,7 @@ Ast *parse_atom(Parser *p) {
n = parse_expr(p, 0);
expect_token(p, TOK_RPAREN);
} else {
panicf("unknown token in %s. %.*s (%s/%d), ", __FUNCTION__, token->len, token->str, token_to_name[token->kind], token->kind);
panicf("unknown token in %s. %.*s (%s/%d), ", __FUNCTION__, token->len, token->str, token_to_name(token->kind), token->kind);
}
return n;
}
@@ -315,7 +116,7 @@ Ast *parse_valid_left_binding(Parser *p, Token *tok, Ast *left) {
case TOK_BITOR: case TOK_BITXOR: case TOK_AND: case TOK_OR: case TOK_LSHIFT: case TOK_RSHIFT: {
return create_binary_expr(tok, tok->kind, left, parse_expr(p, get_binding_power(tok)));
} break;
default: panicf("unknown token in %s. %.*s (%s/%d), ", __FUNCTION__, tok->len, tok->str, token_to_name[tok->kind], tok->kind);
default: panicf("unknown token in %s. %.*s (%s/%d), ", __FUNCTION__, tok->len, tok->str, token_to_name(tok->kind), tok->kind);
}
return NULL;
}
@@ -366,7 +167,7 @@ void print_expr(Ast *n) {
case AST_INT: printf("%lu", n->u); break;
case AST_BINARY: {
print_expr(n->l);
printf(" %s ", token_to_op[n->op]);
printf(" %s ", token_to_op(n->op));
print_expr(n->r);
} break;
default: panicf("encountered invalid ast kind in %s of kind: %d\n", __FUNCTION__, n->kind);
@@ -415,18 +216,17 @@ void parser_test(void) {
TEST_EVAL((2+3)*(4+5));
TEST_EVAL(9>3&1);
TEST_EVAL(8|1<4);
// TEST_EVAL(7<=3+4);
// TEST_EVAL(8>=2*4);
// TEST_EVAL(4==2+2);
// TEST_EVAL(5!=2+2);
// TEST_EVAL(1&&2);
// TEST_EVAL(0||3);
// TEST_EVAL(1||0&&0);
// TEST_EVAL(8<<2);
// TEST_EVAL(32>>3);
// TEST_EVAL(1+2<<3);
// TEST_EVAL(16>>1+1);
TEST_EVAL(7<=3+4);
TEST_EVAL(8>=2*4);
TEST_EVAL(4==2+2);
TEST_EVAL(5!=2+2);
TEST_EVAL(1&&2);
TEST_EVAL(0||3);
TEST_EVAL(1||0&&0);
TEST_EVAL(8<<2);
TEST_EVAL(32>>3);
TEST_EVAL(1+2<<3);
TEST_EVAL(16>>1+1);
#pragma clang diagnostic pop

18
meta.c
View File

@@ -81,19 +81,25 @@ int main() {
}
printf("} Token_Kind;\n");
printf("char *token_to_op[] = {\n");
printf("char *token_to_op(Token_Kind kind) {\n");
printf(" switch (kind) {\n");
for (int i = 0; i < ilen(kinds); i += 1) {
if (kinds[i].serialized_operator) {
printf(" [TOK_%s] = \"%s\",\n", kinds[i].name, kinds[i].serialized_operator);
printf(" case TOK_%s: return \"%s\";\n", kinds[i].name, kinds[i].serialized_operator);
}
}
printf("};\n");
printf(" default: return 0;\n");
printf(" }\n");
printf("}\n");
printf("char *token_to_name[] = {\n");
printf("char *token_to_name(Token_Kind kind) {\n");
printf(" switch (kind) {\n");
for (int i = 0; i < ilen(kinds); i += 1) {
if (kinds[i].name) {
printf(" [TOK_%s] = \"%s\",\n", kinds[i].name, kinds[i].name);
printf(" case TOK_%s: return \"%s\";\n", kinds[i].name, kinds[i].name);
}
}
printf("};\n");
printf(" default: return \"<invalid-token-kind>\";\n");
printf(" }\n");
printf("}\n");
}

222
meta_gen.c
View File

@@ -57,111 +57,117 @@ typedef enum {
TOK_LSHIFT,
TOK_RSHIFT,
} Token_Kind;
char *token_to_op[] = {
[TOK_LPAREN] = "(",
[TOK_RPAREN] = ")",
[TOK_LBRACKET] = "[",
[TOK_RBRACKET] = "]",
[TOK_LBRACE] = "{",
[TOK_RBRACE] = "}",
[TOK_COMMA] = ",",
[TOK_DOT] = ".",
[TOK_ARROW] = "->",
[TOK_ELLIPSIS] = "...",
[TOK_COLON] = ":",
[TOK_SEMICOLON] = ";",
[TOK_QUESTION] = "?",
[TOK_HASH] = "#",
[TOK_HASHHASH] = "##",
[TOK_PLUS] = "+",
[TOK_MINUS] = "-",
[TOK_STAR] = "*",
[TOK_SLASH] = "/",
[TOK_PERCENT] = "%",
[TOK_INC] = "++",
[TOK_DEC] = "--",
[TOK_ASSIGN] = "=",
[TOK_PLUS_ASSIGN] = "+=",
[TOK_MINUS_ASSIGN] = "-=",
[TOK_MUL_ASSIGN] = "*=",
[TOK_DIV_ASSIGN] = "/=",
[TOK_MOD_ASSIGN] = "%=",
[TOK_LSHIFT_ASSIGN] = "<<=",
[TOK_RSHIFT_ASSIGN] = ">>=",
[TOK_AND_ASSIGN] = "&=",
[TOK_XOR_ASSIGN] = "^=",
[TOK_OR_ASSIGN] = "|=",
[TOK_EQ] = "==",
[TOK_NEQ] = "!=",
[TOK_LT] = "<",
[TOK_LEQ] = "<=",
[TOK_GT] = ">",
[TOK_GEQ] = ">=",
[TOK_NOT] = "!",
[TOK_BITNOT] = "~",
[TOK_BITAND] = "&",
[TOK_BITOR] = "|",
[TOK_BITXOR] = "^",
[TOK_AND] = "&&",
[TOK_OR] = "||",
[TOK_LSHIFT] = "<<",
[TOK_RSHIFT] = ">>",
};
char *token_to_name[] = {
[TOK_EOF] = "EOF",
[TOK_ERROR] = "ERROR",
[TOK_IDENT] = "IDENT",
[TOK_KEYWORD] = "KEYWORD",
[TOK_INT] = "INT",
[TOK_FLOAT] = "FLOAT",
[TOK_CHAR] = "CHAR",
[TOK_STRING] = "STRING",
[TOK_LPAREN] = "LPAREN",
[TOK_RPAREN] = "RPAREN",
[TOK_LBRACKET] = "LBRACKET",
[TOK_RBRACKET] = "RBRACKET",
[TOK_LBRACE] = "LBRACE",
[TOK_RBRACE] = "RBRACE",
[TOK_COMMA] = "COMMA",
[TOK_DOT] = "DOT",
[TOK_ARROW] = "ARROW",
[TOK_ELLIPSIS] = "ELLIPSIS",
[TOK_COLON] = "COLON",
[TOK_SEMICOLON] = "SEMICOLON",
[TOK_QUESTION] = "QUESTION",
[TOK_HASH] = "HASH",
[TOK_HASHHASH] = "HASHHASH",
[TOK_PLUS] = "PLUS",
[TOK_MINUS] = "MINUS",
[TOK_STAR] = "STAR",
[TOK_SLASH] = "SLASH",
[TOK_PERCENT] = "PERCENT",
[TOK_INC] = "INC",
[TOK_DEC] = "DEC",
[TOK_ASSIGN] = "ASSIGN",
[TOK_PLUS_ASSIGN] = "PLUS_ASSIGN",
[TOK_MINUS_ASSIGN] = "MINUS_ASSIGN",
[TOK_MUL_ASSIGN] = "MUL_ASSIGN",
[TOK_DIV_ASSIGN] = "DIV_ASSIGN",
[TOK_MOD_ASSIGN] = "MOD_ASSIGN",
[TOK_LSHIFT_ASSIGN] = "LSHIFT_ASSIGN",
[TOK_RSHIFT_ASSIGN] = "RSHIFT_ASSIGN",
[TOK_AND_ASSIGN] = "AND_ASSIGN",
[TOK_XOR_ASSIGN] = "XOR_ASSIGN",
[TOK_OR_ASSIGN] = "OR_ASSIGN",
[TOK_EQ] = "EQ",
[TOK_NEQ] = "NEQ",
[TOK_LT] = "LT",
[TOK_LEQ] = "LEQ",
[TOK_GT] = "GT",
[TOK_GEQ] = "GEQ",
[TOK_NOT] = "NOT",
[TOK_BITNOT] = "BITNOT",
[TOK_BITAND] = "BITAND",
[TOK_BITOR] = "BITOR",
[TOK_BITXOR] = "BITXOR",
[TOK_AND] = "AND",
[TOK_OR] = "OR",
[TOK_LSHIFT] = "LSHIFT",
[TOK_RSHIFT] = "RSHIFT",
};
char *token_to_op(Token_Kind kind) {
switch (kind) {
case TOK_LPAREN: return "(";
case TOK_RPAREN: return ")";
case TOK_LBRACKET: return "[";
case TOK_RBRACKET: return "]";
case TOK_LBRACE: return "{";
case TOK_RBRACE: return "}";
case TOK_COMMA: return ",";
case TOK_DOT: return ".";
case TOK_ARROW: return "->";
case TOK_ELLIPSIS: return "...";
case TOK_COLON: return ":";
case TOK_SEMICOLON: return ";";
case TOK_QUESTION: return "?";
case TOK_HASH: return "#";
case TOK_HASHHASH: return "##";
case TOK_PLUS: return "+";
case TOK_MINUS: return "-";
case TOK_STAR: return "*";
case TOK_SLASH: return "/";
case TOK_PERCENT: return "%";
case TOK_INC: return "++";
case TOK_DEC: return "--";
case TOK_ASSIGN: return "=";
case TOK_PLUS_ASSIGN: return "+=";
case TOK_MINUS_ASSIGN: return "-=";
case TOK_MUL_ASSIGN: return "*=";
case TOK_DIV_ASSIGN: return "/=";
case TOK_MOD_ASSIGN: return "%=";
case TOK_LSHIFT_ASSIGN: return "<<=";
case TOK_RSHIFT_ASSIGN: return ">>=";
case TOK_AND_ASSIGN: return "&=";
case TOK_XOR_ASSIGN: return "^=";
case TOK_OR_ASSIGN: return "|=";
case TOK_EQ: return "==";
case TOK_NEQ: return "!=";
case TOK_LT: return "<";
case TOK_LEQ: return "<=";
case TOK_GT: return ">";
case TOK_GEQ: return ">=";
case TOK_NOT: return "!";
case TOK_BITNOT: return "~";
case TOK_BITAND: return "&";
case TOK_BITOR: return "|";
case TOK_BITXOR: return "^";
case TOK_AND: return "&&";
case TOK_OR: return "||";
case TOK_LSHIFT: return "<<";
case TOK_RSHIFT: return ">>";
default: return 0;
}
}
char *token_to_name(Token_Kind kind) {
switch (kind) {
case TOK_EOF: return "EOF";
case TOK_ERROR: return "ERROR";
case TOK_IDENT: return "IDENT";
case TOK_KEYWORD: return "KEYWORD";
case TOK_INT: return "INT";
case TOK_FLOAT: return "FLOAT";
case TOK_CHAR: return "CHAR";
case TOK_STRING: return "STRING";
case TOK_LPAREN: return "LPAREN";
case TOK_RPAREN: return "RPAREN";
case TOK_LBRACKET: return "LBRACKET";
case TOK_RBRACKET: return "RBRACKET";
case TOK_LBRACE: return "LBRACE";
case TOK_RBRACE: return "RBRACE";
case TOK_COMMA: return "COMMA";
case TOK_DOT: return "DOT";
case TOK_ARROW: return "ARROW";
case TOK_ELLIPSIS: return "ELLIPSIS";
case TOK_COLON: return "COLON";
case TOK_SEMICOLON: return "SEMICOLON";
case TOK_QUESTION: return "QUESTION";
case TOK_HASH: return "HASH";
case TOK_HASHHASH: return "HASHHASH";
case TOK_PLUS: return "PLUS";
case TOK_MINUS: return "MINUS";
case TOK_STAR: return "STAR";
case TOK_SLASH: return "SLASH";
case TOK_PERCENT: return "PERCENT";
case TOK_INC: return "INC";
case TOK_DEC: return "DEC";
case TOK_ASSIGN: return "ASSIGN";
case TOK_PLUS_ASSIGN: return "PLUS_ASSIGN";
case TOK_MINUS_ASSIGN: return "MINUS_ASSIGN";
case TOK_MUL_ASSIGN: return "MUL_ASSIGN";
case TOK_DIV_ASSIGN: return "DIV_ASSIGN";
case TOK_MOD_ASSIGN: return "MOD_ASSIGN";
case TOK_LSHIFT_ASSIGN: return "LSHIFT_ASSIGN";
case TOK_RSHIFT_ASSIGN: return "RSHIFT_ASSIGN";
case TOK_AND_ASSIGN: return "AND_ASSIGN";
case TOK_XOR_ASSIGN: return "XOR_ASSIGN";
case TOK_OR_ASSIGN: return "OR_ASSIGN";
case TOK_EQ: return "EQ";
case TOK_NEQ: return "NEQ";
case TOK_LT: return "LT";
case TOK_LEQ: return "LEQ";
case TOK_GT: return "GT";
case TOK_GEQ: return "GEQ";
case TOK_NOT: return "NOT";
case TOK_BITNOT: return "BITNOT";
case TOK_BITAND: return "BITAND";
case TOK_BITOR: return "BITOR";
case TOK_BITXOR: return "BITXOR";
case TOK_AND: return "AND";
case TOK_OR: return "OR";
case TOK_LSHIFT: return "LSHIFT";
case TOK_RSHIFT: return "RSHIFT";
default: return "<invalid-token-kind>";
}
}