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Tape.java
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99 lines (79 loc) · 2.17 KB
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package org.simdjson;
class Tape {
static final char ROOT = 'r';
static final char START_ARRAY = '[';
static final char START_OBJECT = '{';
static final char END_ARRAY = ']';
static final char END_OBJECT = '}';
static final char STRING = '"';
static final char INT64 = 'l';
static final char DOUBLE = 'd';
static final char TRUE_VALUE = 't';
static final char FALSE_VALUE = 'f';
static final char NULL_VALUE = 'n';
private static final long JSON_VALUE_MASK = 0x00FFFFFFFFFFFFFFL;
private static final int JSON_COUNT_MASK = 0xFFFFFF;
private final long[] tape;
private int tapeIdx;
Tape(int capacity) {
tape = new long[capacity];
}
void append(long val, char type) {
tape[tapeIdx] = val | (((long) type) << 56);
tapeIdx++;
}
void appendInt64(long val) {
append(0, INT64);
tape[tapeIdx] = val;
tapeIdx++;
}
void appendDouble(double val) {
append(0, DOUBLE);
tape[tapeIdx] = Double.doubleToRawLongBits(val);
tapeIdx++;
}
void write(int idx, long val, char type) {
tape[idx] = val | (((long) type) << 56);
}
void skip() {
tapeIdx++;
}
void reset() {
tapeIdx = 0;
}
int getCurrentIdx() {
return tapeIdx;
}
char getType(int idx) {
return (char) (tape[idx] >> 56);
}
long getValue(int idx) {
return tape[idx] & JSON_VALUE_MASK;
}
long getInt64Value(int idx) {
return tape[idx + 1];
}
double getDouble(int idx) {
long bits = getInt64Value(idx);
return Double.longBitsToDouble(bits);
}
int getMatchingBraceIndex(int idx) {
return (int) tape[idx];
}
int getScopeCount(int idx) {
return (int) ((tape[idx] >> 32) & JSON_COUNT_MASK);
}
int computeNextIndex(int idx) {
switch (getType(idx)) {
case START_ARRAY, START_OBJECT -> {
return getMatchingBraceIndex(idx);
}
case INT64, DOUBLE -> {
return idx + 2;
}
default -> {
return idx + 1;
}
}
}
}