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4coder/4cpp_lexer.h

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// TOP
#ifndef FCPP_NEW_LEXER_INC
#define FCPP_NEW_LEXER_INC
#ifndef Assert
# define Assert(n) do{ if (!(n)) *(int*)0 = 0xA11E; }while(0)
#endif
#ifndef FCPP_LINK
# define FCPP_LINK static
#endif
#include "4cpp_lexer_types.h"
#include "4cpp_lexer_fsms.h"
#include "4cpp_lexer_tables.c"
// TODO(allen): revisit this keyword data declaration system
struct String_And_Flag{
char *str;
uint32_t flags;
};
struct String_List{
String_And_Flag *data;
int32_t count;
};
#define lexer_string_list(x) {x, (sizeof(x)/sizeof(*(x)))}
static String_And_Flag preprop_strings[] = {
{"include", CPP_PP_INCLUDE},
{"INCLUDE", CPP_PP_INCLUDE},
{"ifndef", CPP_PP_IFNDEF},
{"IFNDEF", CPP_PP_IFNDEF},
{"define", CPP_PP_DEFINE},
{"DEFINE", CPP_PP_DEFINE},
{"import", CPP_PP_IMPORT},
{"IMPORT", CPP_PP_IMPORT},
{"pragma", CPP_PP_PRAGMA},
{"PRAGMA", CPP_PP_PRAGMA},
{"undef", CPP_PP_UNDEF},
{"UNDEF", CPP_PP_UNDEF},
{"endif", CPP_PP_ENDIF},
{"ENDIF", CPP_PP_ENDIF},
{"error", CPP_PP_ERROR},
{"ERROR", CPP_PP_ERROR},
{"ifdef", CPP_PP_IFDEF},
{"IFDEF", CPP_PP_IFDEF},
{"using", CPP_PP_USING},
{"USING", CPP_PP_USING},
{"else", CPP_PP_ELSE},
{"ELSE", CPP_PP_ELSE},
{"elif", CPP_PP_ELIF},
{"ELIF", CPP_PP_ELIF},
{"line", CPP_PP_LINE},
{"LINE", CPP_PP_LINE},
{"if", CPP_PP_IF},
{"IF", CPP_PP_IF},
};
static String_List preprops = lexer_string_list(preprop_strings);
static String_And_Flag keyword_strings[] = {
{"true", CPP_TOKEN_BOOLEAN_CONSTANT},
{"false", CPP_TOKEN_BOOLEAN_CONSTANT},
{"and", CPP_TOKEN_AND},
{"and_eq", CPP_TOKEN_ANDEQ},
{"bitand", CPP_TOKEN_BIT_AND},
{"bitor", CPP_TOKEN_BIT_OR},
{"or", CPP_TOKEN_OR},
{"or_eq", CPP_TOKEN_OREQ},
{"sizeof", CPP_TOKEN_SIZEOF},
{"alignof", CPP_TOKEN_ALIGNOF},
{"decltype", CPP_TOKEN_DECLTYPE},
{"throw", CPP_TOKEN_THROW},
{"new", CPP_TOKEN_NEW},
{"delete", CPP_TOKEN_DELETE},
{"xor", CPP_TOKEN_BIT_XOR},
{"xor_eq", CPP_TOKEN_XOREQ},
{"not", CPP_TOKEN_NOT},
{"not_eq", CPP_TOKEN_NOTEQ},
{"typeid", CPP_TOKEN_TYPEID},
{"compl", CPP_TOKEN_BIT_NOT},
{"void", CPP_TOKEN_KEY_TYPE},
{"bool", CPP_TOKEN_KEY_TYPE},
{"char", CPP_TOKEN_KEY_TYPE},
{"int", CPP_TOKEN_KEY_TYPE},
{"float", CPP_TOKEN_KEY_TYPE},
{"double", CPP_TOKEN_KEY_TYPE},
{"long", CPP_TOKEN_KEY_MODIFIER},
{"short", CPP_TOKEN_KEY_MODIFIER},
{"unsigned", CPP_TOKEN_KEY_MODIFIER},
{"const", CPP_TOKEN_KEY_QUALIFIER},
{"volatile", CPP_TOKEN_KEY_QUALIFIER},
{"asm", CPP_TOKEN_KEY_CONTROL_FLOW},
{"break", CPP_TOKEN_KEY_CONTROL_FLOW},
{"case", CPP_TOKEN_KEY_CONTROL_FLOW},
{"catch", CPP_TOKEN_KEY_CONTROL_FLOW},
{"continue", CPP_TOKEN_KEY_CONTROL_FLOW},
{"default", CPP_TOKEN_KEY_CONTROL_FLOW},
{"do", CPP_TOKEN_KEY_CONTROL_FLOW},
{"else", CPP_TOKEN_KEY_CONTROL_FLOW},
{"for", CPP_TOKEN_KEY_CONTROL_FLOW},
{"goto", CPP_TOKEN_KEY_CONTROL_FLOW},
{"if", CPP_TOKEN_KEY_CONTROL_FLOW},
{"return", CPP_TOKEN_KEY_CONTROL_FLOW},
{"switch", CPP_TOKEN_KEY_CONTROL_FLOW},
{"try", CPP_TOKEN_KEY_CONTROL_FLOW},
{"while", CPP_TOKEN_KEY_CONTROL_FLOW},
{"static_assert", CPP_TOKEN_KEY_CONTROL_FLOW},
{"const_cast", CPP_TOKEN_KEY_CAST},
{"dynamic_cast", CPP_TOKEN_KEY_CAST},
{"reinterpret_cast", CPP_TOKEN_KEY_CAST},
{"static_cast", CPP_TOKEN_KEY_CAST},
{"class", CPP_TOKEN_KEY_TYPE_DECLARATION},
{"enum", CPP_TOKEN_KEY_TYPE_DECLARATION},
{"struct", CPP_TOKEN_KEY_TYPE_DECLARATION},
{"typedef", CPP_TOKEN_KEY_TYPE_DECLARATION},
{"union", CPP_TOKEN_KEY_TYPE_DECLARATION},
{"template", CPP_TOKEN_KEY_TYPE_DECLARATION},
{"typename", CPP_TOKEN_KEY_TYPE_DECLARATION},
{"friend", CPP_TOKEN_KEY_ACCESS},
{"namespace", CPP_TOKEN_KEY_ACCESS},
{"private", CPP_TOKEN_KEY_ACCESS},
{"protected", CPP_TOKEN_KEY_ACCESS},
{"public", CPP_TOKEN_KEY_ACCESS},
{"using", CPP_TOKEN_KEY_ACCESS},
{"extern", CPP_TOKEN_KEY_LINKAGE},
{"export", CPP_TOKEN_KEY_LINKAGE},
{"inline", CPP_TOKEN_KEY_LINKAGE},
{"static", CPP_TOKEN_KEY_LINKAGE},
{"virtual", CPP_TOKEN_KEY_LINKAGE},
{"alignas", CPP_TOKEN_KEY_OTHER},
{"explicit", CPP_TOKEN_KEY_OTHER},
{"noexcept", CPP_TOKEN_KEY_OTHER},
{"nullptr", CPP_TOKEN_KEY_OTHER},
{"operator", CPP_TOKEN_KEY_OTHER},
{"register", CPP_TOKEN_KEY_OTHER},
{"this", CPP_TOKEN_KEY_OTHER},
{"thread_local", CPP_TOKEN_KEY_OTHER},
};
static String_List keywords = lexer_string_list(keyword_strings);
FCPP_LINK int32_t
sub_match_list(char *chunk, int32_t size, String_List list, int32_t sub_size){
int32_t result = 0;
String str_main = {0};
char *str_check = 0;
int32_t i = 0, l = 0;
result = -1;
str_main = make_string(chunk, size);
if (sub_size > 0){
str_main = substr(str_main, 0, sub_size);
for (i = 0; i < list.count; ++i){
str_check = list.data[i].str;
if (match_sc(str_main, str_check)){
result = i;
break;
}
}
}
else{
for (i = 0; i < list.count; ++i){
str_check = list.data[i].str;
if (match_part_scl(str_main, str_check, &l)){
result = i;
break;
}
}
}
return(result);
}
FCPP_LINK Cpp_Get_Token_Result
cpp_get_token(Cpp_Token_Stack *token_stack, int32_t pos){
Cpp_Get_Token_Result result = {};
Cpp_Token *token_array = token_stack->tokens;
Cpp_Token *token = 0;
int32_t first = 0;
int32_t count = token_stack->count;
int32_t last = count;
int32_t this_start = 0, next_start = 0;
if (count > 0){
for (;;){
result.token_index = (first + last)/2;
token = token_array + result.token_index;
this_start = token->start;
if (result.token_index + 1 < count){
next_start = (token + 1)->start;
}
else{
next_start = this_start + token->size;
}
if (this_start <= pos && pos < next_start){
break;
}
else if (pos < this_start){
last = result.token_index;
}
else{
first = result.token_index + 1;
}
if (first == last){
result.token_index = first;
break;
}
}
if (result.token_index == count){
--result.token_index;
result.in_whitespace = 1;
}
else{
if (token->start + token->size <= pos){
result.in_whitespace = 1;
}
}
}
else{
result.token_index = -1;
result.in_whitespace = 1;
}
return(result);
}
FCPP_LINK void
cpp_shift_token_starts(Cpp_Token_Stack *stack, int32_t from_token_i, int32_t shift_amount){
Cpp_Token *token = stack->tokens + from_token_i;
int32_t count = stack->count, i;
for (i = from_token_i; i < count; ++i, ++token){
token->start += shift_amount;
}
}
enum Pos_Update_Rule{
PUR_none,
PUR_back_one,
};
FCPP_LINK Lex_PP_State
cpp_pp_directive_to_state(Cpp_Token_Type type){
Lex_PP_State result = LSPP_default;
switch (type){
case CPP_PP_INCLUDE:
case CPP_PP_IMPORT:
case CPP_PP_USING:
result = LSPP_include;
break;
case CPP_PP_DEFINE:
result = LSPP_macro_identifier;
break;
case CPP_PP_UNDEF:
case CPP_PP_IFDEF:
case CPP_PP_IFNDEF:
result = LSPP_identifier;
break;
case CPP_PP_IF:
case CPP_PP_ELIF:
result = LSPP_body_if;
break;
case CPP_PP_PRAGMA:
result = LSPP_body;
break;
case CPP_PP_LINE:
result = LSPP_number;
break;
case CPP_PP_ERROR:
result = LSPP_error;
break;
case CPP_PP_UNKNOWN:
case CPP_PP_ELSE:
case CPP_PP_ENDIF:
result = LSPP_junk;
break;
}
return(result);
}
FCPP_LINK Cpp_Token_Merge
cpp_attempt_token_merge(Cpp_Token prev_token, Cpp_Token next_token){
Cpp_Token_Merge result = {(Cpp_Token_Type)0};
if (next_token.type == CPP_TOKEN_COMMENT && prev_token.type == CPP_TOKEN_COMMENT &&
next_token.flags == prev_token.flags && next_token.state_flags == prev_token.state_flags){
result.did_merge = 1;
prev_token.size = next_token.start + next_token.size - prev_token.start;
result.new_token = prev_token;
}
else if (next_token.type == CPP_TOKEN_JUNK && prev_token.type == CPP_TOKEN_JUNK &&
next_token.flags == prev_token.flags && next_token.state_flags == prev_token.state_flags){
result.did_merge = 1;
prev_token.size = next_token.start + next_token.size - prev_token.start;
result.new_token = prev_token;
}
return result;
}
FCPP_LINK int32_t
cpp_place_token_nonalloc(Cpp_Token *out_tokens, int32_t token_i, Cpp_Token token){
Cpp_Token_Merge merge = {(Cpp_Token_Type)0};
Cpp_Token prev_token = {(Cpp_Token_Type)0};
if (token_i > 0){
prev_token = out_tokens[token_i - 1];
merge = cpp_attempt_token_merge(prev_token, token);
if (merge.did_merge){
out_tokens[token_i - 1] = merge.new_token;
}
}
if (!merge.did_merge){
out_tokens[token_i++] = token;
}
return(token_i);
}
FCPP_LINK bool
cpp_push_token_nonalloc(Cpp_Token_Stack *out_tokens, Cpp_Token token){
bool result = 0;
if (out_tokens->count == out_tokens->max_count){
out_tokens->count =
cpp_place_token_nonalloc(out_tokens->tokens, out_tokens->count, token);
result = 1;
}
return(result);
}
struct Lex_Data{
char *tb;
int32_t tb_pos;
int32_t token_start;
int32_t pos;
int32_t pos_overide;
int32_t chunk_pos;
Lex_FSM fsm;
unsigned char white_done;
unsigned char pp_state;
unsigned char completed;
Cpp_Token token;
int32_t __pc__;
};
FCPP_LINK Lex_Data
lex_data_init(char *tb){
Lex_Data data = {0};
data.tb = tb;
return(data);
}
#define DrCase(PC) case PC: goto resumespot_##PC
#define DrYield(PC, n) { \
token_stack_out->count = token_i; \
*S_ptr = S; S_ptr->__pc__ = PC; return(n); resumespot_##PC:; }
#define DrReturn(n) { \
token_stack_out->count = token_i; \
*S_ptr = S; S_ptr->__pc__ = -1; return(n); }
enum Lex_Result{
LexFinished,
LexNeedChunk,
LexNeedTokenMemory,
LexHitTokenLimit
};
FCPP_LINK int32_t
cpp_lex_nonalloc(Lex_Data *S_ptr,
char *chunk, int32_t size,
Cpp_Token_Stack *token_stack_out){
Lex_Data S = *S_ptr;
Cpp_Token *out_tokens = token_stack_out->tokens;
int32_t token_i = token_stack_out->count;
int32_t max_token_i = token_stack_out->max_count;
Pos_Update_Rule pos_update_rule = PUR_none;
char c = 0;
int32_t end_pos = size + S.chunk_pos;
chunk -= S.chunk_pos;
switch (S.__pc__){
DrCase(1);
DrCase(2);
DrCase(3);
DrCase(4);
DrCase(5);
DrCase(7);
}
for (;;){
S.white_done = 0;
for(;;){
for (; S.pp_state < LSPP_count && S.pos < end_pos;){
c = chunk[S.pos++];
int32_t i = S.pp_state + whitespace_fsm_eq_classes[c];
S.pp_state = whitespace_fsm_table[i];
}
S.white_done = (S.pp_state >= LSPP_count);
if (S.white_done == 0){
S.chunk_pos += size;
DrYield(4, LexNeedChunk);
}
else break;
}
--S.pos;
if (S.pp_state >= LSPP_count){
S.pp_state -= LSPP_count;
}
S.token.state_flags = S.pp_state;
S.token_start = S.pos;
S.tb_pos = 0;
S.fsm = zero_lex_fsm();
for(;;){
{
unsigned short *eq_classes = get_eq_classes[S.pp_state];
unsigned char *fsm_table = get_table[S.pp_state];
for (; S.fsm.state < LS_count && S.pos < end_pos;){
c = chunk[S.pos++];
S.tb[S.tb_pos++] = c;
int32_t i = S.fsm.state + eq_classes[c];
S.fsm.state = fsm_table[i];
S.fsm.multi_line |= multiline_state_table[S.fsm.state];
}
S.fsm.emit_token = (S.fsm.state >= LS_count);
}
if (S.fsm.emit_token == 0){
S.chunk_pos += size;
DrYield(3, LexNeedChunk);
}
else break;
}
Assert(S.fsm.emit_token == 1);
if (c == 0){
S.completed = 1;
}
if (S.fsm.state >= LS_count) S.fsm.state -= LS_count;
pos_update_rule = PUR_none;
if (S.pp_state == LSPP_include){
if (c == 0) S.fsm.emit_token = 0;
switch (S.fsm.state){
case LSINC_default:break;
case LSINC_quotes:
case LSINC_pointy:
S.token.type = CPP_TOKEN_INCLUDE_FILE;
S.token.flags = 0;
break;
case LSINC_junk:
S.token.type = CPP_TOKEN_JUNK;
S.token.flags = 0;
break;
}
}
else{
switch (S.fsm.state){
case LS_default:
switch (c){
case 0: S.fsm.emit_token = 0; break;
#define OperCase(op,t) case op: S.token.type = t; break;
OperCase('{', CPP_TOKEN_BRACE_OPEN);
OperCase('}', CPP_TOKEN_BRACE_CLOSE);
OperCase('[', CPP_TOKEN_BRACKET_OPEN);
OperCase(']', CPP_TOKEN_BRACKET_CLOSE);
OperCase('(', CPP_TOKEN_PARENTHESE_OPEN);
OperCase(')', CPP_TOKEN_PARENTHESE_CLOSE);
OperCase('~', CPP_TOKEN_TILDE);
OperCase(',', CPP_TOKEN_COMMA);
OperCase(';', CPP_TOKEN_SEMICOLON);
OperCase('?', CPP_TOKEN_TERNARY_QMARK);
OperCase('@', CPP_TOKEN_JUNK);
OperCase('$', CPP_TOKEN_JUNK);
#undef OperCase
case '\\':
if (S.pp_state == LSPP_default){
S.token.type = CPP_TOKEN_JUNK;
}
else{
S.pos_overide = S.pos;
S.white_done = 0;
for (;;){
for (; S.white_done == 0 && S.pos < end_pos;){
c = chunk[S.pos++];
if (!(c == ' ' || c == '\t' || c == '\r' || c == '\v' || c == '\f')){
S.white_done = 1;
}
}
if (S.white_done == 0){
S.chunk_pos += size;
DrYield(1, LexNeedChunk);
}
else break;
}
if (c == '\n'){
S.fsm.emit_token = 0;
S.pos_overide = 0;
}
else{
S.token.type = CPP_TOKEN_JUNK;
}
}
break;
}
if (c != '@' && c != '$' && c != '\\'){
S.token.flags = CPP_TFLAG_IS_OPERATOR;
}
break;
case LS_identifier:
{
--S.pos;
int32_t word_size = S.pos - S.token_start;
if (S.pp_state == LSPP_body_if){
if (match_ss(make_string(S.tb, word_size), make_lit_string("defined"))){
S.token.type = CPP_TOKEN_DEFINED;
S.token.flags = CPP_TFLAG_IS_OPERATOR | CPP_TFLAG_IS_KEYWORD;
break;
}
}
int32_t sub_match = sub_match_list(S.tb, S.tb_pos, keywords, word_size);
if (sub_match != -1){
String_And_Flag data = keywords.data[sub_match];
S.token.type = (Cpp_Token_Type)data.flags;
S.token.flags = CPP_TFLAG_IS_KEYWORD;
}
else{
S.token.type = CPP_TOKEN_IDENTIFIER;
S.token.flags = 0;
}
}break;
case LS_pound:
S.token.flags = 0;
switch (c){
case '#': S.token.type = CPP_PP_CONCAT; break;
default:
S.token.type = CPP_PP_STRINGIFY;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_ppdef:
case LS_pp:
{
--S.pos;
int32_t word_size = S.pos - S.token_start;
int32_t pos = S.tb_pos-1;
int32_t i = 1;
for (;i < pos; ++i){
if (S.tb[i] != ' '){
break;
}
}
int32_t sub_match = sub_match_list(S.tb+i, pos-i, preprops, word_size);
if (sub_match != -1){
String_And_Flag data = preprops.data[sub_match];
S.token.type = (Cpp_Token_Type)data.flags;
S.token.flags = CPP_TFLAG_PP_DIRECTIVE;
S.pp_state = (unsigned char)cpp_pp_directive_to_state(S.token.type);
}
else{
S.token.type = CPP_TOKEN_JUNK;
S.token.flags = 0;
}
}break;
case LS_number:
case LS_number0:
case LS_hex:
S.fsm.int_state = LSINT_default;
S.fsm.emit_token = 0;
--S.pos;
for (;;){
for (; S.fsm.int_state < LSINT_count && S.pos < end_pos;){
c = chunk[S.pos++];
S.fsm.int_state = int_fsm_table[S.fsm.int_state + int_fsm_eq_classes[c]];
}
S.fsm.emit_token = (S.fsm.int_state >= LSINT_count);
if (S.fsm.emit_token == 0){
S.chunk_pos += size;
DrYield(5, LexNeedChunk);
}
else break;
}
--S.pos;
S.token.type = CPP_TOKEN_INTEGER_CONSTANT;
S.token.flags = 0;
break;
case LS_float:
case LS_crazy_float0:
case LS_crazy_float1:
S.token.type = CPP_TOKEN_FLOATING_CONSTANT;
S.token.flags = 0;
switch (c){
case 'f': case 'F':
case 'l': case 'L':break;
default:
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_char:
case LS_char_slashed:
S.token.type = CPP_TOKEN_JUNK;
if (c == '\''){
S.token.type = CPP_TOKEN_CHARACTER_CONSTANT;
}
S.token.flags = 0;
break;
case LS_char_multiline:
S.token.type = CPP_TOKEN_JUNK;
if (c == '\''){
S.token.type = CPP_TOKEN_CHARACTER_CONSTANT;
}
S.token.flags = CPP_TFLAG_MULTILINE;
break;
case LS_string:
case LS_string_slashed:
S.token.type = CPP_TOKEN_JUNK;
if (c == '"'){
S.token.type = CPP_TOKEN_STRING_CONSTANT;
}
S.token.flags = 0;
break;
case LS_string_multiline:
S.token.type = CPP_TOKEN_JUNK;
if (c == '"'){
S.token.type = CPP_TOKEN_STRING_CONSTANT;
}
S.token.flags = CPP_TFLAG_MULTILINE;
break;
case LS_comment_pre:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_DIVEQ; break;
default:
S.token.type = CPP_TOKEN_DIV;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_comment:
case LS_comment_slashed:
S.token.type = CPP_TOKEN_COMMENT;
S.token.flags = 0;
pos_update_rule = PUR_back_one;
break;
case LS_comment_block:
case LS_comment_block_ending:
S.token.type = CPP_TOKEN_COMMENT;
S.token.flags = 0;
break;
case LS_error_message:
S.token.type = CPP_TOKEN_ERROR_MESSAGE;
S.token.flags = 0;
pos_update_rule = PUR_back_one;
break;
case LS_dot:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '*': S.token.type = CPP_TOKEN_PTRDOT; break;
default:
S.token.type = CPP_TOKEN_DOT;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_ellipsis:
switch (c){
case '.':
S.token.flags = CPP_TFLAG_IS_OPERATOR;
S.token.type = CPP_TOKEN_ELLIPSIS;
break;
default:
S.token.type = CPP_TOKEN_JUNK;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_less:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_LESSEQ; break;
default:
S.token.type = CPP_TOKEN_LESS;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_less_less:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_LSHIFTEQ; break;
default:
S.token.type = CPP_TOKEN_LSHIFT;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_more:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_GRTREQ; break;
default:
S.token.type = CPP_TOKEN_GRTR;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_more_more:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_RSHIFTEQ; break;
default:
S.token.type = CPP_TOKEN_RSHIFT;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_minus:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '-': S.token.type = CPP_TOKEN_DECREMENT; break;
case '=': S.token.type = CPP_TOKEN_SUBEQ; break;
default:
S.token.type = CPP_TOKEN_MINUS;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_arrow:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '*': S.token.type = CPP_TOKEN_PTRARROW; break;
default:
S.token.type = CPP_TOKEN_ARROW;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_and:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '&': S.token.type = CPP_TOKEN_AND; break;
case '=': S.token.type = CPP_TOKEN_ANDEQ; break;
default:
S.token.type = CPP_TOKEN_AMPERSAND;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_or:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '|': S.token.type = CPP_TOKEN_OR; break;
case '=': S.token.type = CPP_TOKEN_OREQ; break;
default:
S.token.type = CPP_TOKEN_BIT_OR;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_plus:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '+': S.token.type = CPP_TOKEN_INCREMENT; break;
case '=': S.token.type = CPP_TOKEN_ADDEQ; break;
default:
S.token.type = CPP_TOKEN_PLUS;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_colon:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case ':': S.token.type = CPP_TOKEN_SCOPE; break;
default:
S.token.type = CPP_TOKEN_COLON;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_star:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_MULEQ; break;
default:
S.token.type = CPP_TOKEN_STAR;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_modulo:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_MODEQ; break;
default:
S.token.type = CPP_TOKEN_MOD;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_caret:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_XOREQ; break;
default:
S.token.type = CPP_TOKEN_BIT_XOR;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_eq:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_EQEQ; break;
default:
S.token.type = CPP_TOKEN_EQ;
pos_update_rule = PUR_back_one;
break;
}
break;
case LS_bang:
S.token.flags = CPP_TFLAG_IS_OPERATOR;
switch (c){
case '=': S.token.type = CPP_TOKEN_NOTEQ; break;
default:
S.token.type = CPP_TOKEN_NOT;
pos_update_rule = PUR_back_one;
break;
}
break;
}
switch (pos_update_rule){
case PUR_back_one:
--S.pos;
break;
default:
if (chunk[S.pos-1] == 0){
--S.pos;
}
break;
}
if ((S.token.flags & CPP_TFLAG_PP_DIRECTIVE) == 0){
switch (S.pp_state){
case LSPP_include:
if (S.token.type != CPP_TOKEN_INCLUDE_FILE){
S.token.type = CPP_TOKEN_JUNK;
}
S.pp_state = LSPP_junk;
break;
case LSPP_macro_identifier:
if (S.fsm.state != LS_identifier){
S.token.type = CPP_TOKEN_JUNK;
S.pp_state = LSPP_junk;
}
else{
S.pp_state = LSPP_body;
}
break;
case LSPP_identifier:
if (S.fsm.state != LS_identifier){
S.token.type = CPP_TOKEN_JUNK;
}
S.pp_state = LSPP_junk;
break;
case LSPP_number:
if (S.token.type != CPP_TOKEN_INTEGER_CONSTANT){
S.token.type = CPP_TOKEN_JUNK;
S.pp_state = LSPP_junk;
}
else{
S.pp_state = LSPP_include;
}
break;
case LSPP_junk:
S.token.type = CPP_TOKEN_JUNK;
break;
}
}
}
if (S.fsm.emit_token){
S.token.start = S.token_start;
if (S.pos_overide){
S.token.size = S.pos_overide - S.token_start;
S.pos_overide = 0;
}
else{
S.token.size = S.pos - S.token_start;
}
if ((S.token.flags & CPP_TFLAG_PP_DIRECTIVE) == 0){
S.token.flags |= (S.pp_state != LSPP_default)?(CPP_TFLAG_PP_BODY):(0);
}
token_i = cpp_place_token_nonalloc(out_tokens, token_i, S.token);
if (token_i == max_token_i){
if (S.pos == end_pos){
S.chunk_pos += size;
DrYield(7, LexNeedChunk);
}
DrYield(2, LexNeedTokenMemory);
}
}
if (S.completed){
break;
}
}
DrReturn(LexFinished);
}
#undef DrYield
#undef DrReturn
#undef DrCase
FCPP_LINK int32_t
cpp_lex_nonalloc(Lex_Data *S_ptr,
char *chunk, int32_t size,
Cpp_Token_Stack *token_stack_out, int32_t max_tokens){
Cpp_Token_Stack temp_stack = *token_stack_out;
if (temp_stack.max_count > temp_stack.count + max_tokens){
temp_stack.max_count = temp_stack.count + max_tokens;
}
int32_t result = cpp_lex_nonalloc(S_ptr, chunk, size, &temp_stack);
token_stack_out->count = temp_stack.count;
if (result == LexNeedTokenMemory){
if (token_stack_out->count < token_stack_out->max_count){
result = LexHitTokenLimit;
}
}
return(result);
}
FCPP_LINK int32_t
cpp_lex_size_nonalloc(Lex_Data *S_ptr,
char *chunk, int32_t size, int32_t full_size,
Cpp_Token_Stack *token_stack_out){
int32_t result = 0;
if (S_ptr->pos >= full_size){
char end_null = 0;
result = cpp_lex_nonalloc(S_ptr, &end_null, 1, token_stack_out);
}
else{
result = cpp_lex_nonalloc(S_ptr, chunk, size, token_stack_out);
if (result == LexNeedChunk){
if (S_ptr->pos >= full_size){
char end_null = 0;
result = cpp_lex_nonalloc(S_ptr, &end_null, 1, token_stack_out);
}
}
}
return(result);
}
FCPP_LINK int32_t
cpp_lex_size_nonalloc(Lex_Data *S_ptr,
char *chunk, int32_t size, int32_t full_size,
Cpp_Token_Stack *token_stack_out, int32_t max_tokens){
Cpp_Token_Stack temp_stack = *token_stack_out;
if (temp_stack.max_count > temp_stack.count + max_tokens){
temp_stack.max_count = temp_stack.count + max_tokens;
}
int32_t result = cpp_lex_size_nonalloc(S_ptr, chunk, size, full_size,
&temp_stack);
token_stack_out->count = temp_stack.count;
if (result == LexNeedTokenMemory){
if (token_stack_out->count < token_stack_out->max_count){
result = LexHitTokenLimit;
}
}
return(result);
}
FCPP_LINK Cpp_Relex_State
cpp_relex_nonalloc_start(char *data, int32_t size, Cpp_Token_Stack *stack,
int32_t start, int32_t end, int32_t amount, int32_t tolerance){
Cpp_Relex_State state;
state.data = data;
state.size = size;
state.stack = stack;
state.start = start;
state.end = end;
state.amount = amount;
state.tolerance = tolerance;
Cpp_Get_Token_Result result = cpp_get_token(stack, start);
state.start_token_i = result.token_index-1;
if (state.start_token_i < 0){
state.start_token_i = 0;
}
result = cpp_get_token(stack, end);
state.end_token_i = result.token_index;
if (end > stack->tokens[state.end_token_i].start){
++state.end_token_i;
}
if (state.end_token_i < 0){
state.end_token_i = 0;
}
state.relex_start = stack->tokens[state.start_token_i].start;
if (start < state.relex_start){
state.relex_start = start;
}
state.space_request = state.end_token_i - state.start_token_i + tolerance + 1;
return(state);
}
FCPP_LINK char
cpp_token_get_pp_state(uint16_t bitfield){
return (char)(bitfield);
}
// TODO(allen): Eliminate this once we actually store the EOF token
// in the token stack.
FCPP_LINK Cpp_Token
cpp__get_token(Cpp_Token_Stack *stack, Cpp_Token *tokens, int32_t size, int32_t index){
Cpp_Token result;
if (index < stack->count){
result = tokens[index];
}
else{
result.start = size;
result.size = 0;
result.type = CPP_TOKEN_EOF;
result.flags = 0;
result.state_flags = 0;
}
return result;
}
FCPP_LINK int32_t
cpp_relex_nonalloc_main(Cpp_Relex_State *state,
Cpp_Token_Stack *relex_stack,
int32_t *relex_end,
char *spare){
Cpp_Token_Stack *stack = state->stack;
Cpp_Token *tokens = stack->tokens;
cpp_shift_token_starts(stack, state->end_token_i, state->amount);
Lex_Data lex = lex_data_init(spare);
lex.pp_state = cpp_token_get_pp_state(tokens[state->start_token_i].state_flags);
lex.pos = state->relex_start;
int32_t relex_end_i = state->end_token_i;
Cpp_Token match_token = cpp__get_token(stack, tokens, state->size, relex_end_i);
Cpp_Token end_token = match_token;
int32_t went_too_far = false;
// TODO(allen): This can be better I suspect.
for (;;){
int32_t result =
cpp_lex_size_nonalloc(&lex,
state->data,
state->size,
state->size,
relex_stack, 1);
switch (result){
case LexHitTokenLimit:
{
Cpp_Token token = relex_stack->tokens[relex_stack->count-1];
if (token.start == end_token.start &&
token.size == end_token.size &&
token.flags == end_token.flags &&
token.state_flags == end_token.state_flags){
--relex_stack->count;
goto double_break;
}
while (lex.pos > end_token.start && relex_end_i < stack->count){
++relex_end_i;
end_token = cpp__get_token(stack, tokens, state->size, relex_end_i);
}
}
break;
case LexNeedChunk: Assert(!"Invalid path"); break;
case LexNeedTokenMemory:
went_too_far = true;
goto double_break;
case LexFinished:
goto double_break;
}
}
double_break:;
if (!went_too_far){
if (relex_stack->count > 0){
if (state->start_token_i > 0){
Cpp_Token_Merge merge =
cpp_attempt_token_merge(tokens[state->start_token_i - 1],
relex_stack->tokens[0]);
if (merge.did_merge){
--state->start_token_i;
relex_stack->tokens[0] = merge.new_token;
}
}
if (relex_end_i < state->stack->count){
Cpp_Token_Merge merge =
cpp_attempt_token_merge(relex_stack->tokens[relex_stack->count-1],
tokens[relex_end_i]);
if (merge.did_merge){
++relex_end_i;
relex_stack->tokens[relex_stack->count-1] = merge.new_token;
}
}
}
*relex_end = relex_end_i;
}
else{
cpp_shift_token_starts(stack, state->end_token_i, -state->amount);
}
return(went_too_far);
}
#if !defined(FCPP_FORBID_MALLOC)
#include <stdlib.h>
#include <string.h>
FCPP_LINK Cpp_Token_Stack
cpp_make_token_stack(int32_t starting_max){
Cpp_Token_Stack token_stack;
token_stack.count = 0;
token_stack.max_count = starting_max;
token_stack.tokens = (Cpp_Token*)malloc(sizeof(Cpp_Token)*starting_max);
return(token_stack);
}
FCPP_LINK void
cpp_free_token_stack(Cpp_Token_Stack token_stack){
free(token_stack.tokens);
}
FCPP_LINK void
cpp_resize_token_stack(Cpp_Token_Stack *token_stack, int32_t new_max){
Cpp_Token *new_tokens = (Cpp_Token*)malloc(sizeof(Cpp_Token)*new_max);
if (new_tokens){
memcpy(new_tokens, token_stack->tokens, sizeof(Cpp_Token)*token_stack->count);
free(token_stack->tokens);
token_stack->tokens = new_tokens;
token_stack->max_count = new_max;
}
}
FCPP_LINK void
cpp_push_token(Cpp_Token_Stack *token_stack, Cpp_Token token){
if (!cpp_push_token_nonalloc(token_stack, token)){
int32_t new_max = 2*token_stack->max_count + 1;
cpp_resize_token_stack(token_stack, new_max);
cpp_push_token_nonalloc(token_stack, token);
}
}
FCPP_LINK void
cpp_lex_file(char *data, int32_t size, Cpp_Token_Stack *token_stack_out){
Lex_Data S = {0};
S.tb = (char*)malloc(size);
int32_t quit = 0;
token_stack_out->count = 0;
for (;!quit;){
int32_t result = cpp_lex_nonalloc(&S, data, size, token_stack_out);
switch (result){
case LexFinished:
{
quit = 1;
}break;
case LexNeedChunk:
{
char empty = 0;
cpp_lex_nonalloc(&S, &empty, 1, token_stack_out);
quit = 1;
}break;
case LexNeedTokenMemory:
{
int32_t new_max = 2*token_stack_out->max_count + 1;
cpp_resize_token_stack(token_stack_out, new_max);
}break;
}
}
free(S.tb);
}
#endif
#endif
// BOTTOM
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