/
inc.js
189 lines (180 loc) · 9.36 KB
/
inc.js
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var Variables = require('../variables')
var explode = require('../explode')
var qualify = require('../qualify')
var $ = require('programmatic')
var joinSources = require('../join-sources')
Generator.prototype.integer = function (field, property) {
var bites = [], bite = field.bite, stop = field.stop, shift
while (bite != stop) {
var value = bite ? 'value >>> ' + bite * 8 : 'value'
bites.push('buffer[start++] = ' + value + ' & 0xff')
bite += field.direction
}
bites = bites.join('\n')
var direction = field.little ? '++' : '--'
return $(' \n\
case ' + (this.step++) + ': \n\
// __blank__ \n\
this.step = ' + this.step + ' \n\
this.bite = ' + field.bite + ' \n\
// __blank__ \n\
case ' + (this.step++) + ': \n\
// __blank__ \n\
while (this.bite != ' + field.stop + ') { \n\
if (start == end) { \n\
engine.start = start \n\
return \n\
} \n\
buffer[start++] = ' + property + ' >>> this.bite * 8 & 0xff \n\
this.bite', direction, ' \n\
} \n\
// __blank__ \n\
this.step = ' + this.step + ' \n\
')
}
Generator.prototype.construct = function (definition) {
var fields = []
for (var name in definition) {
if (name[0] === '$') {
continue
}
var field = definition[name]
if (Array.isArray(field)) {
fields.push(name + ': new Array')
} else {
fields.push(name + ': null')
}
}
return fields.join(',\n')
}
Generator.prototype.nested = function (definition) {
return $(' \n\
', this.serialize(definition), ' \n\
')
}
Generator.prototype.lengthEncoded = function (name, field, depth) {
var source = ''
var length = qualify('length', depth)
var object = qualify('object', depth)
var subObject = qualify('object', depth + 1)
var i = qualify('i', depth)
this.variables.hoist(i)
this.variables.hoist(length)
this.forever = true
var step = this.step + 2
source = $(' \n\
// __reference__ \n\
', this.integer(explode(field.$length), 'frame.object.' + name + '.length'), '\n\
// __blank__ \n\
case ' + (this.step++) + ': \n\
// __blank__ \n\
this.stack.push(frame = {\n\
object: frame.object.' + name + '[frame.index], \n\
index: 0 \n\
}) \n\
this.step = ' + this.step + ' \n\
// __blank__ \n\
', this.nested(field), ' \n\
// __blank__ \n\
this.stack.pop() \n\
frame = this.stack[this.stack.length - 1] \n\
if (++frame.index != frame.object.' + name + '.length) { \n\
this.step = ' + step + ' \n\
continue \n\
} \n\
')
return source
}
Generator.prototype.serialize = function (definition) {
var sources = []
for (var name in definition) {
if (name[0] === '$') {
continue
}
var field = definition[name]
if (Array.isArray(field)) {
field = field[0]
if (field.$length) {
sources.push(this.lengthEncoded(name, field))
}
} else {
field = explode(field)
if (field.type === 'integer') {
sources.push(this.integer(field, 'frame.object.' + name))
}
}
}
return joinSources(sources)
}
function parser (name, definition) {
return new Generator(name, definition).generate()
}
function Generator (name, definition) {
this.step = 0
this.name = name
this.definition = definition
this.variables = new Variables
}
Generator.prototype.generate = function () {
var source = this.serialize(this.definition)
var dispatch = $(' \n\
switch (this.step) { \n\
', source, ' \n\
} \n\
')
if (this.forever) {
dispatch = $(' \n\
for (;;) { \n\
', dispatch, ' \n\
engine.start = start \n\
return \n\
} \n\
')
}
return $(' \n\
serializers.' + this.name + ' = function (object) { \n\
this.step = 0 \n\
this.bite = 0 \n\
this.stop = 0 \n\
this.stack = [{ \n\
object: object, \n\
index: 0, \n\
length: 0 \n\
}] \n\
} \n\
// __blank__ \n\
serializers.' + this.name + '.prototype.serialize = function (engine) { \n\
var buffer = engine.buffer \n\
var start = engine.start \n\
var end = engine.end \n\
// __blank__ \n\
var frame = this.stack[this.stack.length - 1] \n\
// __blank__ \n\
', String(this.variables), ' \n\
// __blank__ \n\
', dispatch, ' \n\
// __blank__ \n\
engine.start = start \n\
// __blank__ \n\
return frame.object \n\
} \n\
')
}
module.exports = function (compiler, definition) {
var source = $(' \n\
var serializers = {} \n\
')
Object.keys(definition).forEach(function (packet) {
source = $(' \n\
', source, ' \n\
// __blank__ \n\
', parser(packet, definition[packet]), ' \n\
')
})
source = $(' \n\
', source, ' \n\
// __blank__ \n\
return serializers \n\
')
return compiler(source)
}