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token.c
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token.c
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#include "lib/parsing.h"
#include "lib/format.h"
#include "lib/string.h"
#include "lib/bit_set.h"
#include "token.h"
Token_Type classify(Parser_State *parser) {
switch(peek(parser)) {
case '\0':
return Empty;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return Float;
case '.': case ',': case '(': case ')': case '\'':
return Operator;
case '-': case '+': {
Parser_State tmp = *parser;
next(&tmp);
switch(peek(&tmp)) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return Float;
default:
return Identifier;
}
}
default:
return Identifier;
}
}
#define CONSOLE_COLORS
#ifdef CONSOLE_COLORS
#define RESET "\x1b[0m"
#define COL_RED_F "\x1b[31m"
#define COL_GRN_F "\x1b[32m"
#define COL_BLU_F "\x1b[34m"
#else
#define RESET ""
#define COL_RED_F ""
#define COL_GRN_F ""
#define COL_BLU_F ""
#endif
cstring operator_strings[Num_Operators] = {
[List] = "List",
[Monad] = "Monad",
[Dyad] = "Dyad",
[Assign] = "Assign",
[LParen] = "LParen",
[RParen] = "RParen",
};
i64 fmt_token_va(Byte_Slice dest, va_list va, Fmt_Info info) {
info = (Fmt_Info){0};
Token tok = va_arg(va, Token);
char *const begin = dest.begin;
dest.begin += fmt_location(dest, tok.loc, info);
dest.begin += fmt_cstr(dest, ": ", info);
dest.begin += fmt_cstr(dest, "Token{ ", info);
if (!tok.is_valid) {
dest.begin += fmt_cstr(dest, "[" COL_RED_F "INVALID" RESET "] ", info);
}
switch (tok.type) {
case Float:
dest.begin += fmt_cstr(dest, "f64: " COL_GRN_F, info);
dest.begin += fmt_i64(dest, (i64)tok.value, info);
dest.begin += fmt_cstr(dest, RESET " ", info);
break;
case Operator:
dest.begin += fmt_cstr(dest, "op: " COL_BLU_F, info);
dest.begin += fmt_cstr(dest, operator_strings[tok.op], info);
dest.begin += fmt_cstr(dest, RESET " ", info);
break;
case Identifier:
dest.begin += fmt_cstr(dest, "identifier: " COL_BLU_F "`", info);
dest.begin += fmt_str(dest, tok.text, info);
dest.begin += fmt_cstr(dest, "`" RESET " ", info);
break;
case Empty:
dest.begin += fmt_cstr(dest, "nil ", info);
break;
}
dest.begin += fmt_cstr(dest, "}", info);
return dest.begin - begin;
}
static bool bit_sets_initialized = false;
static Bit_Set whitespace = {(u64[256 / BITS]){0}};
static Bit_Set specials = {(u64[256 / BITS]){0}};
static Bit_Set delimiters = {(u64[256 / BITS]){0}};
#define WHITESPACE U"\n\t "
#define SPECIALS U",.()"
#define DELIMITERS WHITESPACE SPECIALS
static void initialize_bit_sets() {
bit_sets_initialized = true;
whitespace = bit_set_from_runes(whitespace.data, WHITESPACE);
specials = bit_set_from_runes(specials.data, SPECIALS);
delimiters = bit_set_from_runes(delimiters.data, DELIMITERS);
}
Token next_token(Parser_State *parser) {
if (!bit_sets_initialized)
initialize_bit_sets();
Token result = {0};
while(get_bit(whitespace, peek(parser))) next(parser);
result.loc = parser->location;
result.is_valid = true;
switch (classify(parser)) {
case Empty: {
result.type = Empty;
result.is_valid = false;
} break;
case Float: {
result.type = Float;
result.value = parse_f64(parser);
ensure_total_parse(parser, delimiters);
if (parser->error != None) {
while(peek(parser) && !get_bit(delimiters, peek(parser))) next(parser);
result.is_valid = false;
result.text = (String){
.begin = &parser->source.begin[result.loc.byte],
.end = &parser->source.begin[parser->location.byte]
};
}
} break;
case Operator: {
result.type = Operator;
switch (peek(parser)) {
case ',':
next(parser);
result.op = List;
break;
case '.':
next(parser);
result.op = Monad;
break;
case '\'':
next(parser);
result.op = Dyad;
break;
case '(':
next(parser);
result.op = LParen;
break;
case ')':
next(parser);
result.op = RParen;
break;
case ':':
next(parser);
assert(next(parser) == '=');
result.op = Assign;
break;
default:
assert(false);
break;
}
} break;
case Identifier: {
result.type = Identifier;
while(peek(parser) != '\0' && !get_bit(delimiters, peek(parser))) next(parser);
result.text = (String){
.begin = &parser->source.begin[result.loc.byte],
.end = &parser->source.begin[parser->location.byte]
};
} break;
}
return result;
}