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4coder/4cpp_lexer.h

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/* "4cpp" Open C++ Parser v0.1: Lexer
no warranty implied; use at your own risk
NOTES ON USE:
OPTIONS:
Set options by defining macros before including this file.
FCPP_LEXER_IMPLEMENTATION - causes this file to output function implementations
- this option is unset after use so that future includes of this file
in the same unit do not continue to output implementations
FCPP_NO_MALLOC - prevent including <stdlib.h>
FCPP_NO_ASSERT - prevent including <assert.h>
FCPP_NO_STRING - prevent including <string.h>
FCPP_NO_CRT - FCPP_NO_MALLOC & FCPP_NO_ASSERT & FCPP_NO_STRING
FCPP_FORBID_MALLOC - one step above *NO_MALLOC with this set 4cpp functions that do allocations
are not allowed to be declared or defined at all, forcing the user to handle
allocation themselves
- implies FCPP_NO_MALLOC
FCPP_GET_MEMORY - defines how to make allocations, interface of malloc, defaults to malloc
FCPP_FREE_MEMORY - defines how to free memory, interface of ree, defaults to free
(The above must be defined if FCPP_NO_MALLOC is set, unless FCPP_FORBID_MALLOC is set)
FCPP_ASSERT - defines how to make assertions, interface of assert, defaults to assert
FCPP_MEM_COPY - defines how to copy blocks of memory, interface of memcpy, defaults to memcpy
FCPP_MEM_MOVE - defines how to move blocks of memory, interface of memmove, defaults to memmove
(The above must be defined if FCPP_NO_STRING is set)
FCPP_LINK - defines linkage of non-inline functions, defaults to static
FCPP_EXTERN - changes FCPP_LINK default to extern, this option is ignored if FCPP_LINK is defined
include the file "4cpp_clear_config.h" if you want to undefine all options for some reason
HIDDDEN DEPENDENCIES:
4cpp is not a single file include library, there are dependencies between the files.
Be sure to include these dependencies before 4cpp_lexer.h:
4cpp_types.h
4cpp_string.h
*/
// TOP
// TODO(allen):
//
// EASE OF USE AND DEPLOYMENT
// - make it easier to locate the list of function declarations
// - more C compatibility
//
// POTENTIAL
// - Experiment with optimizations. Sean's State machine?
// - Reserve 0th token for null? Put a EOF token at the end?
// - Pass Cpp_File and Cpp_Token_Stack by value instead of by pointer?
//
// CURRENT
// - lex in chunks
//
#include "4coder_config.h"
#ifndef FCPP_LEXER_INC
#define FCPP_LEXER_INC
#include "4cpp_lexer_types.h"
struct Cpp_Lex_Data{
Cpp_Preprocessor_State pp_state;
int pos;
int complete;
};
struct Cpp_Read_Result{
Cpp_Token token;
int pos;
char newline;
char has_result;
};
Cpp_File
data_as_cpp_file(Data data){
Cpp_File result;
result.data = (char*)data.data;
result.size = data.size;
return(result);
}
// TODO(allen): revisit this keyword data declaration system
struct String_And_Flag{
char *str;
fcpp_u32 flags;
};
struct String_List{
String_And_Flag *data;
int count;
};
struct Sub_Match_List_Result{
int index;
fcpp_i32 new_pos;
};
inline fcpp_u16
cpp_token_set_pp_state(fcpp_u16 bitfield, Cpp_Preprocessor_State state_value){
return (fcpp_u16)state_value;
}
inline Cpp_Preprocessor_State
cpp_token_get_pp_state(fcpp_u16 bitfield){
return (Cpp_Preprocessor_State)(bitfield);
}
inline String
cpp_get_lexeme(char *str, Cpp_Token *token){
String result;
result.str = str + token->start;
result.size = token->size;
return result;
}
inline bool
is_keyword(Cpp_Token_Type type){
return (type >= CPP_TOKEN_KEY_TYPE && type <= CPP_TOKEN_KEY_OTHER);
}
FCPP_LINK Sub_Match_List_Result sub_match_list(Cpp_File file, int pos, String_List list, int sub_size);
FCPP_LINK Seek_Result seek_unescaped_eol(char *data, int size, int pos);
FCPP_LINK Seek_Result seek_unescaped_delim(char *data, int size, int pos, char delim);
FCPP_LINK Seek_Result seek_block_comment_end(char *data, int size, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_whitespace(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_junk_line(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_operator(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_pp_operator(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_alpha_numeric(Cpp_File file, int pos, bool in_if_body);
inline Cpp_Read_Result cpp_read_alpha_numeric(Cpp_File file, int pos) { return cpp_read_alpha_numeric(file, pos, 0); }
FCPP_LINK Cpp_Read_Result cpp_read_number(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_string_litteral(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_character_litteral(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_line_comment(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_block_comment(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_preprocessor(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_pp_include_file(Cpp_File file, int pos);
FCPP_LINK Cpp_Read_Result cpp_read_pp_default_mode(Cpp_File file, int pos, bool in_if_body);
inline Cpp_Read_Result cpp_read_pp_default_mode(Cpp_File file, int pos) { return cpp_read_pp_default_mode(file, pos, 0); }
FCPP_LINK Cpp_Token_Merge cpp_attempt_token_merge(Cpp_Token prev, Cpp_Token next);
FCPP_LINK bool cpp_push_token_no_merge(Cpp_Token_Stack *stack, Cpp_Token token);
FCPP_LINK bool cpp_push_token_nonalloc(Cpp_Token_Stack *stack, Cpp_Token token);
inline Cpp_Lex_Data cpp_lex_data_zero() { Cpp_Lex_Data data = {(Cpp_Preprocessor_State)0}; return(data); }
FCPP_LINK Cpp_Read_Result cpp_lex_step(Cpp_File file, Cpp_Lex_Data *lex);
FCPP_LINK int cpp_lex_file_token_count(Cpp_File file);
FCPP_LINK Cpp_Lex_Data cpp_lex_file_nonalloc(Cpp_File file, Cpp_Token_Stack *stack, Cpp_Lex_Data data);
inline Cpp_Lex_Data cpp_lex_file_nonalloc(Cpp_File file, Cpp_Token_Stack *stack) { return cpp_lex_file_nonalloc(file, stack, cpp_lex_data_zero()); }
FCPP_LINK Cpp_Get_Token_Result cpp_get_token(Cpp_Token_Stack *stack, int pos);
FCPP_LINK int cpp_get_end_token(Cpp_Token_Stack *stack, int end);
FCPP_LINK void cpp_shift_token_starts(Cpp_Token_Stack *stack, int from_token, int amount);
FCPP_LINK Cpp_Relex_State cpp_relex_nonalloc_start(Cpp_File file, Cpp_Token_Stack *stack, int start, int end, int amount, int tolerance);
FCPP_LINK bool cpp_relex_nonalloc_main(Cpp_Relex_State state, Cpp_Token_Stack *stack);
#ifndef FCPP_FORBID_MALLOC
FCPP_LINK Cpp_Token_Stack cpp_make_token_stack(int max);
FCPP_LINK void cpp_free_token_stack(Cpp_Token_Stack stack);
FCPP_LINK void cpp_resize_token_stack(Cpp_Token_Stack *stack, int new_max);
FCPP_LINK void cpp_push_token(Cpp_Token_Stack *stack, Cpp_Token token);
FCPP_LINK void cpp_lex_file(Cpp_File file, Cpp_Token_Stack *stack);
FCPP_LINK bool cpp_relex_file_limited(Cpp_File file, Cpp_Token_Stack *stack, int start_i, int end_i, int amount, int extra_tolerance);
inline void cpp_relex_file(Cpp_File file, Cpp_Token_Stack *stack, int start_i, int end_i, int amount)
{ cpp_relex_file_limited(file, stack, start_i, end_i, amount, -1); }
#endif
#define FCPP_STRING_LIST(x) {x, FCPP_COUNT(x)}
// TODO(allen): shift towards storing in a context
FCPP_GLOBAL String_And_Flag int_suf_strings[] = {
{"ull"}, {"ULL"},
{"llu"}, {"LLU"},
{"ll"}, {"LL"},
{"l"}, {"L"},
{"u"}, {"U"}
};
FCPP_GLOBAL String_List int_sufs = FCPP_STRING_LIST(int_suf_strings);
FCPP_GLOBAL String_And_Flag float_suf_strings[] = {
{"f"}, {"F"},
{"l"}, {"L"}
};
FCPP_GLOBAL String_List float_sufs = FCPP_STRING_LIST(float_suf_strings);
FCPP_GLOBAL String_And_Flag bool_lit_strings[] = {
{"true"}, {"false"}
};
FCPP_GLOBAL String_List bool_lits = FCPP_STRING_LIST(bool_lit_strings);
FCPP_GLOBAL String_And_Flag keyword_strings[] = {
{"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},
};
FCPP_GLOBAL String_List keywords = FCPP_STRING_LIST(keyword_strings);
FCPP_GLOBAL String_And_Flag op_strings[] = {
{"...", CPP_TOKEN_ELLIPSIS},
{"<<=", CPP_TOKEN_LSHIFTEQ},
{">>=", CPP_TOKEN_RSHIFTEQ},
{"->*", CPP_TOKEN_PTRARROW},
{"<<", CPP_TOKEN_LSHIFT},
{">>", CPP_TOKEN_RSHIFT},
{"&&", CPP_TOKEN_AND},
{"||", CPP_TOKEN_OR},
{"->", CPP_TOKEN_ARROW},
{"++", CPP_TOKEN_INCREMENT},
{"--", CPP_TOKEN_DECREMENT},
{"::", CPP_TOKEN_SCOPE},
{"+=", CPP_TOKEN_ADDEQ},
{"-=", CPP_TOKEN_SUBEQ},
{"*=", CPP_TOKEN_MULEQ},
{"/=", CPP_TOKEN_DIVEQ},
{"%=", CPP_TOKEN_MODEQ},
{"&=", CPP_TOKEN_ANDEQ},
{"|=", CPP_TOKEN_OREQ},
{"^=", CPP_TOKEN_XOREQ},
{"==", CPP_TOKEN_EQEQ},
{">=", CPP_TOKEN_GRTREQ},
{"<=", CPP_TOKEN_LESSEQ},
{"!=", CPP_TOKEN_NOTEQ},
{".*", CPP_TOKEN_PTRDOT},
{"{", CPP_TOKEN_BRACE_OPEN},
{"}", CPP_TOKEN_BRACE_CLOSE},
{"[", CPP_TOKEN_BRACKET_OPEN},
{"]", CPP_TOKEN_BRACKET_CLOSE},
{"(", CPP_TOKEN_PARENTHESE_OPEN},
{")", CPP_TOKEN_PARENTHESE_CLOSE},
{"<", CPP_TOKEN_LESS},
{">", CPP_TOKEN_GRTR},
{"+", CPP_TOKEN_PLUS},
{"-", CPP_TOKEN_MINUS},
{"!", CPP_TOKEN_NOT},
{"~", CPP_TOKEN_TILDE},
{"*", CPP_TOKEN_STAR},
{"&", CPP_TOKEN_AMPERSAND},
{"|", CPP_TOKEN_BIT_OR},
{"^", CPP_TOKEN_BIT_XOR},
{"=", CPP_TOKEN_EQ},
{",", CPP_TOKEN_COMMA},
{":", CPP_TOKEN_COLON},
{";", CPP_TOKEN_SEMICOLON},
{"/", CPP_TOKEN_DIV},
{"?", CPP_TOKEN_TERNARY_QMARK},
{"%", CPP_TOKEN_MOD},
{".", CPP_TOKEN_DOT},
};
FCPP_GLOBAL String_List ops = FCPP_STRING_LIST(op_strings);
FCPP_GLOBAL String_And_Flag pp_op_strings[] = {
{"##", CPP_PP_CONCAT},
{"#", CPP_PP_STRINGIFY},
};
FCPP_GLOBAL String_List pp_ops = FCPP_STRING_LIST(pp_op_strings);
FCPP_GLOBAL 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},
};
FCPP_GLOBAL String_List preprops = FCPP_STRING_LIST(preprop_strings);
#undef FCPP_STRING_LIST
#endif // #ifndef FCPP_CPP_LEXER
#ifdef FCPP_LEXER_IMPLEMENTATION
#define _Assert FCPP_ASSERT
#define _TentativeAssert FCPP_ASSERT
FCPP_LINK Sub_Match_List_Result
sub_match_list(Cpp_File file, int pos, String_List list, int sub_size){
Sub_Match_List_Result result;
String str_main;
char *str_check;
int i,l;
result.index = -1;
result.new_pos = pos;
str_main = make_string(file.data + pos, file.size - pos);
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(str_main, str_check)){
result.index = i;
result.new_pos = pos + sub_size;
break;
}
}
}
else{
for (i = 0; i < list.count; ++i){
str_check = list.data[i].str;
if (match_part(str_main, str_check, &l)){
result.index = i;
result.new_pos = pos + l;
break;
}
}
}
return result;
}
FCPP_LINK Seek_Result
seek_unescaped_eol(char *data, int size, int pos){
Seek_Result result = {};
++pos;
while (pos < size){
if (data[pos] == '\\'){
if (pos + 1 < size &&
data[pos+1] == '\n'){
result.new_line = 1;
++pos;
}
else if (pos + 1 < size &&
data[pos+1] == '\r' &&
pos + 2 < size &&
data[pos+2] == '\n'){
result.new_line = 1;
pos += 2;
}
}
else if (data[pos] == '\n'){
break;
}
++pos;
}
++pos;
result.pos = pos;
return result;
}
FCPP_LINK Seek_Result
seek_unescaped_delim(char *data, int size, int pos, char delim){
Seek_Result result = {};
bool escape = 0;
++pos;
while (pos < size){
if (data[pos] == '\n'){
result.new_line = 1;
}
if (escape){
escape = 0;
}
else{
if (data[pos] == '\\'){
escape = 1;
}
else if (data[pos] == delim){
break;
}
}
++pos;
}
++pos;
result.pos = pos;
return result;
}
FCPP_LINK Seek_Result
seek_block_comment_end(char *data, int size, int pos){
Seek_Result result = {};
pos += 2;
while (pos < size){
if (data[pos] == '*' &&
pos + 1 < size &&
data[pos+1] == '/'){
break;
}
if (data[pos] == '\n'){
result.new_line = 1;
}
++pos;
}
pos += 2;
result.pos = pos;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_whitespace(Cpp_File file, int pos){
Cpp_Read_Result result = {};
while (pos < file.size && char_is_whitespace(file.data[pos])){
if (file.data[pos] == '\n'){
result.newline = 1;
}
++pos;
}
result.pos = pos;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_junk_line(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.token.start = pos;
result.token.type = CPP_TOKEN_JUNK;
bool comment_end = 0;
while (pos < file.size && file.data[pos] != '\n'){
if (file.data[pos] == '/' && pos + 1 < file.size){
if (file.data[pos + 1] == '/' ||
file.data[pos + 1] == '*'){
comment_end = 1;
break;
}
}
++pos;
}
if (comment_end){
result.pos = pos;
result.token.size = pos - result.token.start;
}
else{
while (pos > 0 && file.data[pos - 1] == '\r'){
--pos;
}
if (pos > 0 && file.data[pos - 1] == '\\'){
--pos;
}
result.pos = pos;
result.token.size = pos - result.token.start;
}
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_operator(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.pos = pos;
result.token.start = pos;
Sub_Match_List_Result match;
match = sub_match_list(file, result.token.start, ops, -1);
if (match.index != -1){
result.pos = match.new_pos;
result.token.size = result.pos - result.token.start;
result.token.type = (Cpp_Token_Type)ops.data[match.index].flags;
result.token.flags |= CPP_TFLAG_IS_OPERATOR;
}
else{
result.token.size = 1;
result.token.type = CPP_TOKEN_JUNK;
result.pos = pos + 1;
}
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_pp_operator(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.pos = pos;
result.token.start = pos;
Sub_Match_List_Result match;
match = sub_match_list(file, result.token.start, pp_ops, -1);
_Assert(match.index != -1);
result.pos = match.new_pos;
result.token.size = result.pos - result.token.start;
result.token.type = (Cpp_Token_Type)pp_ops.data[match.index].flags;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_alpha_numeric(Cpp_File file, int pos, bool in_if_body){
Cpp_Read_Result result = {};
result.pos = pos;
result.token.start = pos;
while (result.pos < file.size &&
char_is_alpha_numeric(file.data[result.pos])){
++result.pos;
}
result.token.size = result.pos - result.token.start;
// TODO(allen): do better
if (in_if_body){
String word;
word.size = result.token.size;
word.str = file.data + result.token.start;
if (match(word, "defined")){
result.token.type = CPP_TOKEN_DEFINED;
result.token.flags |= CPP_TFLAG_IS_OPERATOR;
result.token.flags |= CPP_TFLAG_IS_KEYWORD;
}
}
if (result.token.type == CPP_TOKEN_JUNK){
Sub_Match_List_Result match;
match = sub_match_list(file, result.token.start, bool_lits, result.token.size);
if (match.index != -1){
result.token.type = CPP_TOKEN_BOOLEAN_CONSTANT;
result.token.flags |= CPP_TFLAG_IS_KEYWORD;
}
else{
match = sub_match_list(file, result.token.start, keywords, result.token.size);
if (match.index != -1){
String_And_Flag data = keywords.data[match.index];
result.token.type = (Cpp_Token_Type)data.flags;
result.token.flags |= CPP_TFLAG_IS_KEYWORD;
}
else{
result.token.type = CPP_TOKEN_IDENTIFIER;
}
}
}
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_number(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.pos = pos;
result.token.start = pos;
bool is_float = 0;
bool is_integer = 0;
bool is_oct = 0;
bool is_hex = 0;
bool is_zero = 0;
if (file.data[pos] == '0'){
if (pos+1 < file.size){
char next = file.data[pos+1];
if (next == 'x'){
is_hex = 1;
is_integer = 1;
}
else if (next == '.'){
is_float = 1;
++result.pos;
}
else if (next >= '0' && next <= '9'){
is_oct = 1;
is_integer = 1;
}
else{
is_zero = 1;
is_integer = 1;
}
}
else{
is_zero = 1;
is_integer = 1;
}
}
else if (file.data[pos] == '.'){
is_float = 1;
}
if (is_zero){
++result.pos;
}
else if (is_hex){
++result.pos;
char character;
do{
++result.pos;
if (result.pos >= file.size){
break;
}
character = file.data[result.pos];
} while(char_is_hex(character));
}
else if (is_oct){
char character;
do{
++result.pos;
if (result.pos >= file.size){
break;
}
character = file.data[result.pos];
}while(char_is_numeric(character));
}
else{
if (!is_float){
is_integer = 1;
while (1){
++result.pos;
if (result.pos >= file.size){
break;
}
bool is_good = 0;
char character = file.data[result.pos];
if (character >= '0' && character <= '9'){
is_good = 1;
}
else if (character == '.'){
is_integer = 0;
is_float = 1;
}
if (!is_good){
break;
}
}
}
if (is_float){
bool e_mode = 0;
bool e_minus = 0;
bool is_good = 0;
char character;
while (1){
++result.pos;
if (result.pos >= file.size){
break;
}
is_good = 0;
character = file.data[result.pos];
if (character >= '0' && character <= '9'){
is_good = 1;
}
else{
if (character == 'e' && !e_mode){
e_mode = 1;
is_good = 1;
}
else if (character == '-' && e_mode && !e_minus){
e_minus = 1;
is_good = 1;
}
}
if (!is_good){
break;
}
}
}
}
if (is_integer){
Sub_Match_List_Result match =
sub_match_list(file, result.pos, int_sufs, -1);
if (match.index != -1){
result.pos = match.new_pos;
}
result.token.type = CPP_TOKEN_INTEGER_CONSTANT;
result.token.size = result.pos - result.token.start;
}
else if (is_float){
Sub_Match_List_Result match =
sub_match_list(file, result.pos, float_sufs, -1);
if (match.index != -1){
result.pos = match.new_pos;
}
result.token.type = CPP_TOKEN_FLOATING_CONSTANT;
result.token.size = result.pos - result.token.start;
}
else{
_Assert(!"This shouldn't happen!");
}
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_string_litteral(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.token.start = pos;
_Assert(file.data[pos] == '"');
Seek_Result seek = seek_unescaped_delim(file.data, file.size, pos, '"');
pos = seek.pos;
if (seek.new_line){
result.token.flags |= CPP_TFLAG_MULTILINE;
}
result.token.size = pos - result.token.start;
result.token.type = CPP_TOKEN_STRING_CONSTANT;
result.pos = pos;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_character_litteral(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.token.start = pos;
_Assert(file.data[pos] == '\'');
Seek_Result seek = seek_unescaped_delim(file.data, file.size, pos, '\'');
pos = seek.pos;
if (seek.new_line){
result.token.flags |= CPP_TFLAG_MULTILINE;
}
result.token.size = pos - result.token.start;
result.token.type = CPP_TOKEN_CHARACTER_CONSTANT;
result.pos = pos;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_line_comment(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.token.start = pos;
_Assert(file.data[pos] == '/' && file.data[pos + 1] == '/');
pos += 2;
while (pos < file.size){
if (file.data[pos] == '\n'){
break;
}
if (file.data[pos] == '\\'){
if (pos + 1 < file.size &&
file.data[pos + 1] == '\n'){
++pos;
}
else if (pos + 2 < file.size &&
file.data[pos + 1] == '\r' &&
file.data[pos + 2] == '\n'){
pos += 2;
}
}
++pos;
}
if (pos > 0 && file.data[pos-1] == '\r'){
--pos;
}
result.token.size = pos - result.token.start;
result.token.type = CPP_TOKEN_COMMENT;
result.pos = pos;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_block_comment(Cpp_File file, int pos){
Cpp_Read_Result result = {};
result.token.start = pos;
_Assert(file.data[pos] == '/' && file.data[pos + 1] == '*');
pos += 2;
while (pos < file.size){
if (file.data[pos] == '*' &&
pos + 1 < file.size &&
file.data[pos+1] == '/'){
break;
}
++pos;
}
pos += 2;
result.token.size = pos - result.token.start;
result.token.type = CPP_TOKEN_COMMENT;
result.pos = pos;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_preprocessor(Cpp_File file, int pos){
_Assert(file.data[pos] == '#');
Cpp_Read_Result result = {};
result.token.start = pos;
result.token.type = CPP_PP_UNKNOWN;
result.token.flags |= CPP_TFLAG_PP_DIRECTIVE;
++pos;
while (pos < file.size &&
(file.data[pos] == ' ' ||
file.data[pos] == '\t')){
++pos;
}
Sub_Match_List_Result match
= sub_match_list(file, pos, preprops, -1);
if (match.index != -1){
result.token.size = match.new_pos - result.token.start;
result.token.type = (Cpp_Token_Type)preprops.data[match.index].flags;
result.pos = match.new_pos;
}
else{
while (pos < file.size &&
!char_is_whitespace(file.data[pos])){
++pos;
}
result.token.size = pos - result.token.start;
result.pos = pos;
}
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_pp_include_file(Cpp_File file, int pos){
char start = file.data[pos];
_Assert(start == '<' || start == '"');
Cpp_Read_Result result = {};
result.token.start = pos;
result.token.type = CPP_TOKEN_INCLUDE_FILE;
result.token.flags |= CPP_TFLAG_PP_BODY;
char end;
if (start == '<'){
end = '>';
}
else{
end = '"';
}
++pos;
while (pos < file.size && file.data[pos] != end){
if (file.data[pos] == '\n'){
result.token.type = CPP_TOKEN_JUNK;
result.token.flags |= CPP_TFLAG_BAD_ENDING;
break;
}
if (file.data[pos] == '\\'){
// TODO(allen): Not sure that this is 100% correct.
if (pos + 1 < file.size &&
file.data[pos + 1] == '\n'){
++pos;
result.token.flags |= CPP_TFLAG_MULTILINE;
}
else if (pos + 2 < file.size &&
file.data[pos + 1] == '\r' &&
file.data[pos + 2] == '\n'){
pos += 2;
result.token.flags |= CPP_TFLAG_MULTILINE;
}
}
++pos;
}
if (result.token.type != CPP_TOKEN_JUNK){
if (pos < file.size){
++pos;
}
}
result.token.size = pos - result.token.start;
result.pos = pos;
return result;
}
FCPP_LINK Cpp_Read_Result
cpp_read_pp_default_mode(Cpp_File file, int pos, bool in_if_body){
char current = file.data[pos];
Cpp_Read_Result result;
if (char_is_numeric(current)){
result = cpp_read_number(file, pos);
}
else if (char_is_alpha(current)){
result = cpp_read_alpha_numeric(file, pos, in_if_body);
}
else if (current == '.'){
if (pos + 1 < file.size){
char next = file.data[pos + 1];
if (char_is_numeric(next)){
result = cpp_read_number(file, pos);
}
else{
result = cpp_read_operator(file, pos);
}
}
else{
result = cpp_read_operator(file, pos);
}
}
else if (current == '/'){
if (pos + 1 < file.size){
char next = file.data[pos + 1];
if (next == '/'){
result = cpp_read_line_comment(file, pos);
}
else if (next == '*'){
result = cpp_read_block_comment(file, pos);
}
else{
result = cpp_read_operator(file, pos);
}
}
else{
result = cpp_read_operator(file, pos);
}
}
else if (current == '"'){
result = cpp_read_string_litteral(file, pos);
}
else if (current == '\''){
result = cpp_read_character_litteral(file, pos);
}
else{
result = cpp_read_operator(file, pos);
}
return result;
}
FCPP_LINK Cpp_Token_Merge
cpp_attempt_token_merge(Cpp_Token prev_token, Cpp_Token next_token){
Cpp_Token_Merge result = {};
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 bool
cpp_push_token_no_merge(Cpp_Token_Stack *token_stack, Cpp_Token token){
if (token_stack->count >= token_stack->max_count){
return 0;
}
token_stack->tokens[token_stack->count++] = token;
return 1;
}
FCPP_LINK bool
cpp_push_token_nonalloc(Cpp_Token_Stack *token_stack, Cpp_Token token){
Cpp_Token_Merge merge = {};
if (token_stack->count > 0){
Cpp_Token prev_token = token_stack->tokens[token_stack->count - 1];
merge = cpp_attempt_token_merge(prev_token, token);
if (merge.did_merge){
token_stack->tokens[token_stack->count - 1] = merge.new_token;
}
}
if (!merge.did_merge){
if (token_stack->count >= token_stack->max_count){
return 0;
}
token_stack->tokens[token_stack->count++] = token;
}
return 1;
}
FCPP_LINK Cpp_Read_Result
cpp_lex_step(Cpp_File file, Cpp_Lex_Data *lex_data){
Cpp_Lex_Data lex = *lex_data;
Cpp_Read_Result result = {};
bool has_result = 1;
fcpp_u16 state_flags = cpp_token_set_pp_state(0, lex.pp_state);
char current = file.data[lex.pos];
if (char_is_whitespace(current)){
result = cpp_read_whitespace(file, lex.pos);
lex.pos = result.pos;
if (result.newline && lex.pp_state != CPP_LEX_PP_DEFAULT){
lex.pp_state = CPP_LEX_PP_DEFAULT;
}
has_result = 0;
}
else{
if (lex.pp_state == CPP_LEX_PP_DEFAULT){
// TODO(allen): Not first hard of the line? Then it's junk.
if (current == '#'){
result = cpp_read_preprocessor(file, lex.pos);
lex.pos = result.pos;
switch (result.token.type){
case CPP_PP_INCLUDE:
case CPP_PP_IMPORT:
case CPP_PP_USING:
lex.pp_state = CPP_LEX_PP_INCLUDE;
break;
case CPP_PP_DEFINE:
lex.pp_state = CPP_LEX_PP_MACRO_IDENTIFIER;
break;
case CPP_PP_UNDEF:
case CPP_PP_IFDEF:
case CPP_PP_IFNDEF:
lex.pp_state = CPP_LEX_PP_IDENTIFIER;
break;
case CPP_PP_IF:
case CPP_PP_ELIF:
lex.pp_state = CPP_LEX_PP_BODY_IF;
break;
case CPP_PP_PRAGMA:
lex.pp_state = CPP_LEX_PP_BODY;
break;
case CPP_PP_LINE:
lex.pp_state = CPP_LEX_PP_NUMBER;
break;
case CPP_PP_ERROR:
lex.pp_state = CPP_LEX_PP_ERROR;
break;
case CPP_PP_UNKNOWN:
case CPP_PP_ELSE:
case CPP_PP_ENDIF:
lex.pp_state = CPP_LEX_PP_JUNK;
break;
}
}
else{
result = cpp_read_pp_default_mode(file, lex.pos);
lex.pos = result.pos;
}
}
else{
if (current == '\\'){
fcpp_i32 seek = lex.pos;
++seek;
while (seek < file.size && file.data[seek] == '\r'){
++seek;
}
if ((seek < file.size && file.data[seek] == '\n') || seek >= file.size){
lex.pos = seek + 1;
has_result = 0;
}
else{
lex.pp_state = CPP_LEX_PP_JUNK;
result.token.type = CPP_TOKEN_JUNK;
result.token.start = lex.pos;
result.token.size = 1;
result.token.flags |= CPP_TFLAG_PP_BODY;
lex.pos = seek;
}
}
else{
switch (lex.pp_state){
case CPP_LEX_PP_IDENTIFIER:
if (!char_is_alpha_numeric(current)){
has_result = 0;
lex.pp_state = CPP_LEX_PP_JUNK;
}
else{
result = cpp_read_alpha_numeric(file, lex.pos);
result.token.flags |= CPP_TFLAG_PP_BODY;
lex.pos = result.pos;
lex.pp_state = CPP_LEX_PP_JUNK;
}
break;
case CPP_LEX_PP_MACRO_IDENTIFIER:
if (!char_is_alpha_numeric(current)){
has_result = 0;
lex.pp_state = CPP_LEX_PP_JUNK;
}
else{
result = cpp_read_alpha_numeric(file, lex.pos);
result.token.flags |= CPP_TFLAG_PP_BODY;
lex.pos = result.pos;
lex.pp_state = CPP_LEX_PP_BODY;
}
break;
case CPP_LEX_PP_INCLUDE:
if (current != '"' && current != '<'){
has_result = 0;
lex.pp_state = CPP_LEX_PP_JUNK;
}
else{
result = cpp_read_pp_include_file(file, lex.pos);
lex.pos = result.pos;
lex.pp_state = CPP_LEX_PP_JUNK;
}
break;
case CPP_LEX_PP_BODY:
if (current == '#'){
result = cpp_read_pp_operator(file, lex.pos);
}
else{
result = cpp_read_pp_default_mode(file, lex.pos);
}
lex.pos = result.pos;
result.token.flags |= CPP_TFLAG_PP_BODY;
break;
case CPP_LEX_PP_BODY_IF:
if (current == '#'){
result = cpp_read_pp_operator(file, lex.pos);
}
else{
result = cpp_read_pp_default_mode(file, lex.pos, 1);
}
lex.pos = result.pos;
result.token.flags |= CPP_TFLAG_PP_BODY;
break;
case CPP_LEX_PP_NUMBER:
if (!char_is_numeric(current)){
has_result = 0;
lex.pp_state = CPP_LEX_PP_JUNK;
}
else{
result = cpp_read_number(file, lex.pos);
lex.pos = result.pos;
result.token.flags |= CPP_TFLAG_PP_BODY;
lex.pp_state = CPP_LEX_PP_INCLUDE;
}
break;
case CPP_LEX_PP_ERROR:
result = cpp_read_junk_line(file, lex.pos);
lex.pos = result.pos;
result.token.type = CPP_TOKEN_ERROR_MESSAGE;
result.token.flags |= CPP_TFLAG_PP_BODY;
break;
default:
{
bool took_comment = 0;
if (current == '/' && lex.pos + 1 < file.size){
if (file.data[lex.pos + 1] == '/'){
result = cpp_read_line_comment(file, lex.pos);
lex.pp_state = CPP_LEX_PP_DEFAULT;
lex.pos = result.pos;
took_comment = 1;
}else if (file.data[lex.pos + 1] == '*'){
result = cpp_read_block_comment(file, lex.pos);
lex.pos = result.pos;
took_comment = 1;
}
}
if (!took_comment){
result = cpp_read_junk_line(file, lex.pos);
lex.pos = result.pos;
result.token.flags |= CPP_TFLAG_PP_BODY;
}
}break;
}
}
}
}
result.token.state_flags = state_flags;
result.has_result = has_result;
*lex_data = lex;
return result;
}
FCPP_LINK int
cpp_lex_file_token_count(Cpp_File file){
int count = 0;
Cpp_Lex_Data lex = {};
Cpp_Token token = {};
while (lex.pos < file.size){
Cpp_Read_Result step_result = cpp_lex_step(file, &lex);
if (step_result.has_result){
if (count > 0){
Cpp_Token_Merge merge = cpp_attempt_token_merge(token, step_result.token);
if (merge.did_merge){
token = merge.new_token;
}
else{
token = step_result.token;
++count;
}
}
else{
token = step_result.token;
++count;
}
}
}
return count;
}
FCPP_LINK Cpp_Lex_Data
cpp_lex_file_nonalloc(Cpp_File file, Cpp_Token_Stack *token_stack_out, Cpp_Lex_Data data){
while (data.pos < file.size){
Cpp_Lex_Data prev_lex = data;
Cpp_Read_Result step_result = cpp_lex_step(file, &data);
if (step_result.has_result){
if (!cpp_push_token_nonalloc(token_stack_out, step_result.token)){
data = prev_lex;
return data;
}
}
}
data.complete = 1;
return data;
}
FCPP_LINK Cpp_Get_Token_Result
cpp_get_token(Cpp_Token_Stack *token_stack, int pos){
int first, last;
first = 0;
last = token_stack->count;
Cpp_Get_Token_Result result = {};
if (token_stack->count > 0){
for (;;){
result.token_index = (first + last)/2;
int this_start = token_stack->tokens[result.token_index].start;
int next_start;
if (result.token_index + 1 < token_stack->count){
next_start = token_stack->tokens[result.token_index+1].start;
}
else{
next_start = this_start + token_stack->tokens[result.token_index].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 == token_stack->count){
--result.token_index;
result.in_whitespace = 1;
}
else{
Cpp_Token *token = token_stack->tokens + result.token_index;
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, int from_token_i, int amount){
int count = stack->count;
Cpp_Token *token = stack->tokens + from_token_i;
for (int i = from_token_i; i < count; ++i, ++token){
token->start += amount;
}
}
FCPP_LINK Cpp_Relex_State
cpp_relex_nonalloc_start(Cpp_File file, Cpp_Token_Stack *stack,
int start, int end, int amount, int tolerance){
Cpp_Relex_State state;
state.file = file;
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);
if (result.token_index <= 0){
state.start_token_i = 0;
}
else{
state.start_token_i = result.token_index-1;
}
result = cpp_get_token(stack, end);
if (result.token_index < 0){
result.token_index = 0;
}
else if (end > stack->tokens[result.token_index].start){
++result.token_index;
}
state.end_token_i = result.token_index;
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);
}
inline Cpp_Token
cpp__get_token(Cpp_Token_Stack *stack, Cpp_Token *tokens, int size, int 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 bool
cpp_relex_nonalloc_main(Cpp_Relex_State *state, Cpp_Token_Stack *relex_stack, int *relex_end){
Cpp_Token_Stack *stack = state->stack;
Cpp_Token *tokens = stack->tokens;
cpp_shift_token_starts(stack, state->end_token_i, state->amount);
Cpp_Lex_Data lex = {};
lex.pp_state = cpp_token_get_pp_state(tokens[state->start_token_i].state_flags);
lex.pos = state->relex_start;
int relex_end_i = state->end_token_i;
Cpp_Token match_token = cpp__get_token(stack, tokens, state->file.size, relex_end_i);
Cpp_Token end_token = match_token;
bool went_too_far = 0;
for (;;){
Cpp_Read_Result read = cpp_lex_step(state->file, &lex);
if (read.has_result){
if (read.token.start == end_token.start &&
read.token.size == end_token.size &&
read.token.flags == end_token.flags &&
read.token.state_flags == end_token.state_flags){
break;
}
cpp_push_token_nonalloc(relex_stack, read.token);
while (lex.pos > end_token.start && relex_end_i < stack->count){
++relex_end_i;
end_token = cpp__get_token(stack, tokens, state->file.size, relex_end_i);
}
if (relex_stack->count == relex_stack->max_count){
went_too_far = 1;
break;
}
}
if (lex.pos >= state->file.size) 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);
}
#ifndef FCPP_FORBID_MALLOC
FCPP_LINK Cpp_Token_Stack
cpp_make_token_stack(int starting_max){
Cpp_Token_Stack token_stack;
token_stack.count = 0;
token_stack.max_count = starting_max;
token_stack.tokens = (Cpp_Token*)FCPP_GET_MEMORY(sizeof(Cpp_Token)*starting_max);
return token_stack;
}
FCPP_LINK void
cpp_free_token_stack(Cpp_Token_Stack token_stack){
FCPP_FREE_MEMORY(token_stack.tokens);
}
FCPP_LINK void
cpp_resize_token_stack(Cpp_Token_Stack *token_stack, int new_max){
Cpp_Token *new_tokens = (Cpp_Token*)FCPP_GET_MEMORY(sizeof(Cpp_Token)*new_max);
if (new_tokens){
FCPP_MEM_COPY(new_tokens, token_stack->tokens, sizeof(Cpp_Token)*token_stack->count);
FCPP_FREE_MEMORY(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)){
int new_max = 2*token_stack->max_count + 1;
cpp_resize_token_stack(token_stack, new_max);
bool result = cpp_push_token_nonalloc(token_stack, token);
_Assert(result);
}
}
FCPP_LINK void
cpp_lex_file(Cpp_File file, Cpp_Token_Stack *token_stack_out){
Cpp_Lex_Data lex = {};
while (lex.pos < file.size){
Cpp_Read_Result step_result = cpp_lex_step(file, &lex);
if (step_result.has_result){
cpp_push_token(token_stack_out, step_result.token);
}
}
}
FCPP_LINK bool
cpp_relex_file_limited(Cpp_File file, Cpp_Token_Stack *stack,
int start, int end, int amount, int tolerance){
#if 0
int start_token_i, end_token_i;
Cpp_Get_Token_Result get_result = cpp_get_token(token_stack, start_i);
start_token_i = get_result.token_index;
get_result = cpp_get_token(token_stack, end_i);
end_token_i = get_result.token_index;
if (end_token_i == -1){
end_token_i = 0;
}
else if (end > token_stack->tokens[end_token_i].start){
++end_token_i;
}
cpp_shift_token_starts(token_stack, end_token_i, amount);
int relex_start_i = start_token_i - 1;
if (relex_start_i < 0){
relex_start_i = 0;
}
int end_guess_i = end_token_i + 1;
if (end_guess_i > token_stack->count){
--end_guess_i;
}
#endif
int relex_start_i;
int end_token_i, end_guess_i;
{
Cpp_Get_Token_Result result = cpp_get_token(stack, start);
if (result.token_index <= 0){
relex_start_i = 0;
}
else{
relex_start_i = result.token_index-1;
}
result = cpp_get_token(stack, end);
if (result.token_index < 0) result.token_index = 0;
else if (end > stack->tokens[result.token_index].start) ++result.token_index;
end_token_i = result.token_index;
end_guess_i = result.token_index+1;
}
int relex_start = stack->tokens[relex_start_i].start;
if (start < relex_start) relex_start = start;
cpp_shift_token_starts(stack, end_token_i, amount);
Cpp_Token_Stack relex_stack = cpp_make_token_stack((end_guess_i - relex_start_i + 1) * 3 / 2);
Cpp_Lex_Data lex = {};
lex.pp_state = cpp_token_get_pp_state(stack->tokens[relex_start_i].state_flags);
lex.pos = relex_start;
bool went_too_far = 0;
while (1){
Cpp_Read_Result result = cpp_lex_step(file, &lex);
if (result.has_result){
if (end_guess_i < stack->count &&
result.token.start == stack->tokens[end_guess_i].start &&
result.token.size == stack->tokens[end_guess_i].size &&
result.token.flags == stack->tokens[end_guess_i].flags &&
result.token.state_flags == stack->tokens[end_guess_i].state_flags){
break;
}
else{
cpp_push_token(&relex_stack, result.token);
while (lex.pos > stack->tokens[end_guess_i].start &&
end_guess_i < stack->count){
++end_guess_i;
}
}
}
if (lex.pos >= file.size){
break;
}
if (tolerance >= 0 && relex_stack.count + relex_start_i >= end_guess_i + tolerance){
went_too_far = 1;
break;
}
}
if (!went_too_far){
int relex_end_i = end_guess_i;
if (relex_stack.count > 0){
if (relex_start_i > 0){
Cpp_Token_Merge merge = cpp_attempt_token_merge(stack->tokens[relex_start_i - 1],
relex_stack.tokens[0]);
if (merge.did_merge){
--relex_start_i;
relex_stack.tokens[0] = merge.new_token;
}
}
if (relex_end_i < stack->count){
Cpp_Token_Merge merge = cpp_attempt_token_merge(relex_stack.tokens[relex_stack.count - 1],
stack->tokens[relex_end_i]);
if (merge.did_merge){
++relex_end_i;
relex_stack.tokens[relex_stack.count - 1] = merge.new_token;
}
}
}
int token_delete_amount = relex_end_i - relex_start_i;
int token_shift_amount = relex_stack.count - token_delete_amount;
if (token_shift_amount != 0){
int new_token_count = stack->count + token_shift_amount;
if (new_token_count > stack->max_count){
int new_max = 2*stack->max_count + 1;
while (new_token_count > new_max){
new_max = 2*new_max + 1;
}
cpp_resize_token_stack(stack, new_max);
}
if (relex_end_i < stack->count){
FCPP_MEM_MOVE(stack->tokens + relex_end_i + token_shift_amount,
stack->tokens + relex_end_i, sizeof(Cpp_Token)*(stack->count - relex_end_i));
}
stack->count += token_shift_amount;
}
FCPP_MEM_COPY(stack->tokens + relex_start_i, relex_stack.tokens, sizeof(Cpp_Token)*relex_stack.count);
cpp_free_token_stack(relex_stack);
}
else{
cpp_shift_token_starts(stack, end_token_i, -amount);
cpp_free_token_stack(relex_stack);
}
return went_too_far;
}
#endif
#undef _Assert
#undef _TentativeAssert
#undef FCPP_LEXER_IMPLEMENTATION
#endif // #ifdef FCPP_LEXER_IMPLEMENTATION
// BOTTOM
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