32 lines
1.6 KiB
JavaScript
32 lines
1.6 KiB
JavaScript
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const { ProtoDef } = require('protodef')
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const assert = require('assert')
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// Create a protocol where DrawText is sent with a "opacity" field at the end only if the color isn't transparent.
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const protocol = {
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string: ['pstring', { countType: 'varint' }],
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ColorPalette: ['container', [{ name: 'palette', type: ['array', { countType: 'i32', type: 'string' }] }]],
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DrawText: ['container', [{ name: 'color', type: 'u8' }, { name: 'opacity', type: ['switch', { compareTo: 'color', fields: { '/color_transparent': 'void' }, default: 'u8' }] }]]
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}
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function test () {
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// A "palette" here refers to a array of values, identified with their index in the array
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const palette = ['red', 'green', 'blue', 'transparent']
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const proto = new ProtoDef()
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proto.addTypes(protocol)
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// A "variable" is similar to a type, it's a primitive value that can be used in switch comparisons.
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proto.setVariable('color_transparent', palette.indexOf('transparent'))
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// An example usage is sending paletted IDs, with feild serialization based on those IDs
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proto.createPacketBuffer('ColorPalette', { palette })
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// Here, "opacity", 0x4 is written *only* if the color isn't transparent. In this case, it is, so 0x4 isn't written.
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// At the top is 0x3, the index of the "transparent" color.
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const s = proto.createPacketBuffer('DrawText', { color: palette.indexOf('transparent'), opacity: 4 })
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assert(s.equals(Buffer.from([3])))
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console.log(s)
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// Here 4 should be written at the end
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const t = proto.createPacketBuffer('DrawText', { color: palette.indexOf('blue'), opacity: 4 })
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assert(t.equals(Buffer.from([2, 4])))
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}
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test()
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