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Viewing file:     encoder.js (4.08 KB)      -rw-r--r--

"use strict";
module.exports = encoder;

var Enum     = require("./enum"),
    types    = require("./types"),
    util     = require("./util");

/**
 * Generates a partial message type encoder.
 * @param {Codegen} gen Codegen instance
 * @param {Field} field Reflected field
 * @param {number} fieldIndex Field index
 * @param {string} ref Variable reference
 * @returns {Codegen} Codegen instance
 * @ignore
 */
function genTypePartial(gen, field, fieldIndex, ref) {
  /* eslint-disable no-unexpected-multiline */
  if (field.resolvedType.group) {
    gen("types[%i].encode(%s,w.uint32(%i)).uint32(%i)", fieldIndex, ref, (field.id << 3 | 3) >>> 0, (field.id << 3 | 4) >>> 0);
    return;
  }
  var key = (field.id << 3 | 2) >>> 0;
  if (field.preEncoded()) {
    gen("if (%s instanceof Uint8Array) {", ref)
    ("w.uint32(%i)", key)
    ("w.bytes(%s)", ref)
    ("} else {");
  }
  gen("types[%i].encode(%s,w.uint32(%i).fork()).ldelim()", fieldIndex, ref, key);
  if (field.preEncoded()) {
    gen("}")
  }
}

/**
 * Generates an encoder specific to the specified message type.
 * @param {Type} mtype Message type
 * @returns {Codegen} Codegen instance
 */
function encoder(mtype) {
    /* eslint-disable no-unexpected-multiline, block-scoped-var, no-redeclare */
    var gen = util.codegen(["m", "w"], mtype.name + "$encode")
    ("if(!w)")
        ("w=Writer.create()");

    var i, ref;

    // "when a message is serialized its known fields should be written sequentially by field number"
    var fields = /* initializes */ mtype.fieldsArray.slice().sort(util.compareFieldsById);

    for (var i = 0; i < fields.length; ++i) {
        var field    = fields[i].resolve(),
            index    = mtype._fieldsArray.indexOf(field),
            type     = field.resolvedType instanceof Enum ? "int32" : field.type,
            wireType = types.basic[type];
            ref      = "m" + util.safeProp(field.name);

        // Map fields
        if (field.map) {
            gen
    ("if(%s!=null&&Object.hasOwnProperty.call(m,%j)){", ref, field.name) // !== undefined && !== null
        ("for(var ks=Object.keys(%s),i=0;i<ks.length;++i){", ref)
            ("w.uint32(%i).fork().uint32(%i).%s(ks[i])", (field.id << 3 | 2) >>> 0, 8 | types.mapKey[field.keyType], field.keyType);
            if (wireType === undefined) gen
            ("types[%i].encode(%s[ks[i]],w.uint32(18).fork()).ldelim().ldelim()", index, ref); // can't be groups
            else gen
            (".uint32(%i).%s(%s[ks[i]]).ldelim()", 16 | wireType, type, ref);
            gen
        ("}")
    ("}");

            // Repeated fields
        } else if (field.repeated) {
          var arrayRef = ref;
          if (field.useToArray()) {
            arrayRef = "array" + field.id;
            gen("var %s", arrayRef);
            gen("if (%s!=null&&%s.toArray) { %s = %s.toArray() } else { %s = %s }",
                ref, ref, arrayRef, ref, arrayRef, ref);
          }
          gen("if(%s!=null&&%s.length){", arrayRef, arrayRef); // !== undefined && !== null
            // Packed repeated
            if (field.packed && types.packed[type] !== undefined) { gen

        ("w.uint32(%i).fork()", (field.id << 3 | 2) >>> 0)
        ("for(var i=0;i<%s.length;++i)", arrayRef)
            ("w.%s(%s[i])", type, arrayRef)
        ("w.ldelim()");

            // Non-packed
            } else { gen

        ("for(var i=0;i<%s.length;++i)", arrayRef);
                if (wireType === undefined)
            genTypePartial(gen, field, index, arrayRef + "[i]");
                else gen
            ("w.uint32(%i).%s(%s[i])", (field.id << 3 | wireType) >>> 0, type, arrayRef);

            } gen
    ("}");

        // Non-repeated
        } else {
            if (field.optional) gen
    ("if(%s!=null&&Object.hasOwnProperty.call(m,%j))", ref, field.name); // !== undefined && !== null

            if (wireType === undefined)
        genTypePartial(gen, field, index, ref);
            else gen
        ("w.uint32(%i).%s(%s)", (field.id << 3 | wireType) >>> 0, type, ref);

        }
    }

    return gen
    ("return w");
    /* eslint-enable no-unexpected-multiline, block-scoped-var, no-redeclare */
}