66 lines
2.5 KiB
JavaScript
66 lines
2.5 KiB
JavaScript
import { BitWidth } from './bit-width.js';
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import { paddingSize, uwidth, fromByteWidth } from './bit-width-util.js';
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import { ValueType } from './value-type.js';
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import { isInline, packedType } from './value-type-util.js';
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export class StackValue {
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constructor(builder, type, width, value = null, offset = 0) {
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this.builder = builder;
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this.type = type;
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this.width = width;
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this.value = value;
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this.offset = offset;
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}
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elementWidth(size, index) {
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if (isInline(this.type))
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return this.width;
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for (let i = 0; i < 4; i++) {
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const width = 1 << i;
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const offsetLoc = size + paddingSize(size, width) + index * width;
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const offset = offsetLoc - this.offset;
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const bitWidth = uwidth(offset);
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if (1 << bitWidth === width) {
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return bitWidth;
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}
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}
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throw `Element is unknown. Size: ${size} at index: ${index}. This might be a bug. Please create an issue https://github.com/google/flatbuffers/issues/new`;
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}
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writeToBuffer(byteWidth) {
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const newOffset = this.builder.computeOffset(byteWidth);
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if (this.type === ValueType.FLOAT) {
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if (this.width === BitWidth.WIDTH32) {
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this.builder.view.setFloat32(this.builder.offset, this.value, true);
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}
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else {
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this.builder.view.setFloat64(this.builder.offset, this.value, true);
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}
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}
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else if (this.type === ValueType.INT) {
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const bitWidth = fromByteWidth(byteWidth);
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this.builder.pushInt(this.value, bitWidth);
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}
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else if (this.type === ValueType.UINT) {
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const bitWidth = fromByteWidth(byteWidth);
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this.builder.pushUInt(this.value, bitWidth);
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}
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else if (this.type === ValueType.NULL) {
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this.builder.pushInt(0, this.width);
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}
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else if (this.type === ValueType.BOOL) {
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this.builder.pushInt(this.value ? 1 : 0, this.width);
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}
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else {
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throw `Unexpected type: ${this.type}. This might be a bug. Please create an issue https://github.com/google/flatbuffers/issues/new`;
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}
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this.offset = newOffset;
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}
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storedWidth(width = BitWidth.WIDTH8) {
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return isInline(this.type) ? Math.max(width, this.width) : this.width;
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}
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storedPackedType(width = BitWidth.WIDTH8) {
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return packedType(this.type, this.storedWidth(width));
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}
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isOffset() {
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return !isInline(this.type);
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}
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}
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