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struct Lexer {
TokenArray* src;
TokenArray* tokens;
};
typedef struct Lexer Lexer;
Lexer* lexer_new(TokenArray* pp_tokens) {
Lexer* l = calloc(1, sizeof(Lexer));
l->src = pp_tokens;
l->tokens = calloc(1, sizeof(TokenArray));
// l->tokens need not store whitespace tokens.
tokens_init(l->tokens, pp_tokens->len / 2);
return l;
}
void tokenize_all(Lexer* l) {
for (int pos = 0; pos < l->src->len; ++pos) {
Token* pp_tok = &l->src->data[pos];
TokenKind k = pp_tok->kind;
if (k == TokenKind_whitespace || k == TokenKind_newline) {
continue;
}
Token* tok = tokens_push_new(l->tokens);
tok->loc = pp_tok->loc;
if (k == TokenKind_character_constant) {
tok->kind = TokenKind_literal_int;
int ch = pp_tok->raw.data[1];
if (ch == '\\') {
ch = pp_tok->raw.data[2];
if (ch == 'a') {
ch = '\a';
} else if (ch == 'b') {
ch = '\b';
} else if (ch == 'f') {
ch = '\f';
} else if (ch == 'n') {
ch = '\n';
} else if (ch == 'r') {
ch = '\r';
} else if (ch == 't') {
ch = '\t';
} else if (ch == 'v') {
ch = '\v';
} else if (ch == '0') {
ch = '\0';
}
}
char* buf = calloc(4, sizeof(char));
sprintf(buf, "%d", ch);
tok->raw.data = buf;
tok->raw.len = strlen(buf);
} else if (k == TokenKind_literal_str) {
tok->kind = TokenKind_literal_str;
tok->raw.data = pp_tok->raw.data + 1;
tok->raw.len = pp_tok->raw.len - 2;
} else if (k == TokenKind_ident) {
if (string_equals_cstr(&pp_tok->raw, "auto")) {
tok->kind = TokenKind_keyword_auto;
} else if (string_equals_cstr(&pp_tok->raw, "break")) {
tok->kind = TokenKind_keyword_break;
} else if (string_equals_cstr(&pp_tok->raw, "case")) {
tok->kind = TokenKind_keyword_case;
} else if (string_equals_cstr(&pp_tok->raw, "char")) {
tok->kind = TokenKind_keyword_char;
} else if (string_equals_cstr(&pp_tok->raw, "const")) {
tok->kind = TokenKind_keyword_const;
} else if (string_equals_cstr(&pp_tok->raw, "continue")) {
tok->kind = TokenKind_keyword_continue;
} else if (string_equals_cstr(&pp_tok->raw, "default")) {
tok->kind = TokenKind_keyword_default;
} else if (string_equals_cstr(&pp_tok->raw, "do")) {
tok->kind = TokenKind_keyword_do;
} else if (string_equals_cstr(&pp_tok->raw, "double")) {
tok->kind = TokenKind_keyword_double;
} else if (string_equals_cstr(&pp_tok->raw, "else")) {
tok->kind = TokenKind_keyword_else;
} else if (string_equals_cstr(&pp_tok->raw, "enum")) {
tok->kind = TokenKind_keyword_enum;
} else if (string_equals_cstr(&pp_tok->raw, "extern")) {
tok->kind = TokenKind_keyword_extern;
} else if (string_equals_cstr(&pp_tok->raw, "float")) {
tok->kind = TokenKind_keyword_float;
} else if (string_equals_cstr(&pp_tok->raw, "for")) {
tok->kind = TokenKind_keyword_for;
} else if (string_equals_cstr(&pp_tok->raw, "goto")) {
tok->kind = TokenKind_keyword_goto;
} else if (string_equals_cstr(&pp_tok->raw, "if")) {
tok->kind = TokenKind_keyword_if;
} else if (string_equals_cstr(&pp_tok->raw, "inline")) {
tok->kind = TokenKind_keyword_inline;
} else if (string_equals_cstr(&pp_tok->raw, "int")) {
tok->kind = TokenKind_keyword_int;
} else if (string_equals_cstr(&pp_tok->raw, "long")) {
tok->kind = TokenKind_keyword_long;
} else if (string_equals_cstr(&pp_tok->raw, "register")) {
tok->kind = TokenKind_keyword_register;
} else if (string_equals_cstr(&pp_tok->raw, "restrict")) {
tok->kind = TokenKind_keyword_restrict;
} else if (string_equals_cstr(&pp_tok->raw, "return")) {
tok->kind = TokenKind_keyword_return;
} else if (string_equals_cstr(&pp_tok->raw, "short")) {
tok->kind = TokenKind_keyword_short;
} else if (string_equals_cstr(&pp_tok->raw, "signed")) {
tok->kind = TokenKind_keyword_signed;
} else if (string_equals_cstr(&pp_tok->raw, "sizeof")) {
tok->kind = TokenKind_keyword_sizeof;
} else if (string_equals_cstr(&pp_tok->raw, "static")) {
tok->kind = TokenKind_keyword_static;
} else if (string_equals_cstr(&pp_tok->raw, "struct")) {
tok->kind = TokenKind_keyword_struct;
} else if (string_equals_cstr(&pp_tok->raw, "switch")) {
tok->kind = TokenKind_keyword_switch;
} else if (string_equals_cstr(&pp_tok->raw, "typedef")) {
tok->kind = TokenKind_keyword_typedef;
} else if (string_equals_cstr(&pp_tok->raw, "union")) {
tok->kind = TokenKind_keyword_union;
} else if (string_equals_cstr(&pp_tok->raw, "unsigned")) {
tok->kind = TokenKind_keyword_unsigned;
} else if (string_equals_cstr(&pp_tok->raw, "void")) {
tok->kind = TokenKind_keyword_void;
} else if (string_equals_cstr(&pp_tok->raw, "volatile")) {
tok->kind = TokenKind_keyword_volatile;
} else if (string_equals_cstr(&pp_tok->raw, "while")) {
tok->kind = TokenKind_keyword_while;
} else if (string_equals_cstr(&pp_tok->raw, "_Bool")) {
tok->kind = TokenKind_keyword__Bool;
} else if (string_equals_cstr(&pp_tok->raw, "_Complex")) {
tok->kind = TokenKind_keyword__Complex;
} else if (string_equals_cstr(&pp_tok->raw, "_Imaginary")) {
tok->kind = TokenKind_keyword__Imaginary;
} else if (string_equals_cstr(&pp_tok->raw, "va_start")) {
tok->kind = TokenKind_va_start;
tok->raw = pp_tok->raw;
} else {
tok->kind = TokenKind_ident;
tok->raw = pp_tok->raw;
}
} else if (k == TokenKind_other) {
unreachable();
} else {
tok->kind = pp_tok->kind;
tok->raw = pp_tok->raw;
}
}
}
TokenArray* tokenize(TokenArray* pp_tokens) {
Lexer* l = lexer_new(pp_tokens);
tokenize_all(l);
return l->tokens;
}
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