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#pragma once
#include "string.h"
using TOKENIZER_COMPARE_FN = FN<U8( char )>;
struct STR_TOKENIZER {
STR str;
STR ignored;
I32 cur;
I32 last;
};
inline STR_TOKENIZER tok_init( STR str, STR whitespace_chars = " \t\n\r" ) {
return {
.str = str,
.ignored = { whitespace_chars },
.cur = 0,
.last = 0,
};
}
inline STR tok_next( STR_TOKENIZER* t ) {
if( t->cur >= t->str.size )
return "";
U8 start = 0;
for( I32 i = t->cur; i < t->str.size; i++ ) {
U8 c = t->str.data[i];
if( i == t->str.size - 1 ) {
if( !start )
return "";
STR ret = { (U32)i - t->cur + 1, t->str.data + t->cur };
t->last = t->cur;
t->cur = i + 1;
return ret;
}
for( auto& it : t->ignored ) {
if( c == it ) {
if( !start ) {
t->cur = i + 1;
continue;
} else {
STR ret = { (U32)i - t->cur, t->str.data + t->cur };
t->last = t->cur;
t->cur = i + 1;
return ret;
}
}
}
start = 1;
}
return "";
}
inline STR tok_peek( STR_TOKENIZER* t ) {
if( t->cur >= t->str.size )
return "";
U8 start = 0;
I32 cur = t->cur;
for( I32 i = cur; i < t->str.size; i++ ) {
U8 c = t->str.data[i];
if( i == t->str.size - 1 ) {
if( !start )
return "";
STR ret = { (U32)i - cur + 1, t->str.data + cur };
return ret;
}
for( auto& it : t->ignored ) {
if( c == it ) {
if( !start ) {
cur = i + 1;
continue;
} else {
STR ret = { (U32)i - cur, t->str.data + cur };
return ret;
}
}
}
start = 1;
}
return "";
}
inline STR tok_next( STR_TOKENIZER* t, STR what ) {
if( t->cur >= t->str.size )
return "";
if( !what.size )
return "";
for( I32 i = t->cur; i <= t->str.size - what.size; i++ ) {
STR slice = { what.size, t->str.data + i };
if( slice == what ) {
STR ret = { (U32)i - t->cur, t->str.data + i + what.size };
t->last = t->cur;
t->cur = i + what.size;
return ret;
}
}
return "";
}
inline char tok_nextchar( STR_TOKENIZER* t ) {
if( t->cur >= t->str.size )
return 0;
U32 last = t->cur;
for( ; t->cur < t->str.size; t->cur++ ) {
U8 cont = 0;
for( auto& it : t->ignored ) {
if( t->str.data[t->cur] == it ) {
cont = 1;
break;
}
}
if( cont )
continue;
else {
t->last = last;
t->cur++;
return t->str.data[t->cur];
}
}
return 0;
}
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