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atomparsing.h
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49 lines (40 loc) · 1.62 KB
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namespace atomparsing {
really_inline uint32_t string_to_uint32(const char* str) { return *reinterpret_cast<const uint32_t *>(str); }
WARN_UNUSED
really_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 64-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | is_not_structural_or_whitespace(src[5])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | is_not_structural_or_whitespace(src[4])) == 0;
}
WARN_UNUSED
really_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing