Value Change Dump ([VCD](https://en.wikipedia.org/wiki/Value_change_dump)) parser using [llparse](https://github.com/nodejs/llparse) based on [wavedrom](https://github.com/wavedrom/vcd).
## Prepare
1. [Install emcc compiler](https://kirigaya.cn/blog/article?seq=55)
2. clone https://github.com/Digital-EDA/digital-vcd-parser
## Build
```bash
source $EMCC_HOME/emsdk_env.sh
# once only
npm install browserify terser -g
# once only
node bin/build.js
# build
make -j 12
# adjust to browser environment
browserify ./bin/vcd.js | terser --compress -o ./out/vcd.js
```
production are :
- `./out/vcd.js`
- `./out/vcd.wasm`
move them to your development worksapce.
## Usage
Only stream of Uint8 is supported as input. e.g. we want to parse a certain `*.vcd` read in browser-like environment. Mount vcd to window in your `index.html`:
```html
<%= htmlWebpackPlugin.options.title %>
```
In your main workspace (`App.vue` for example), goes like this:
```javascript
const uint8array = await readVcdFile();
const vcdstream = await getVcdStream();
// level size diagram data
const values = {};
vcdstream.change.any((id, time, cmd, value, mask) => {
if (values[id] === undefined) {
values[id] = [];
}
values[id].push({time, cmd, value, mask});
})
const maxChunkLength = 1 << 17;
for (let i = 0; i < uint8array.length; i += maxChunkLength) {
const piece = uint8array.slice(i, i + maxChunkLength);
vcdstream.write(piece);
}
// structure info of wires in vcdstream.info
console.log(vcdstream.info);
```
---
## License
MIT [LICENSE](LICENSE)