327 lines
9.0 KiB
JavaScript
327 lines
9.0 KiB
JavaScript
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"use strict";
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module.exports = proto_target;
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proto_target.private = true;
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var protobuf = require("../..");
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var Namespace = protobuf.Namespace,
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Enum = protobuf.Enum,
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Type = protobuf.Type,
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Field = protobuf.Field,
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OneOf = protobuf.OneOf,
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Service = protobuf.Service,
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Method = protobuf.Method,
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types = protobuf.types,
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util = protobuf.util;
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function underScore(str) {
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return str.substring(0,1)
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+ str.substring(1)
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.replace(/([A-Z])(?=[a-z]|$)/g, function($0, $1) { return "_" + $1.toLowerCase(); });
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}
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var out = [];
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var indent = 0;
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var first = false;
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var syntax = 3;
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function proto_target(root, options, callback) {
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if (options) {
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switch (options.syntax) {
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case undefined:
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case "proto3":
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case "3":
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syntax = 3;
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break;
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case "proto2":
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case "2":
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syntax = 2;
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break;
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default:
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return callback(Error("invalid syntax: " + options.syntax));
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}
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}
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indent = 0;
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first = false;
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try {
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buildRoot(root);
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return callback(null, out.join("\n"));
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} catch (err) {
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return callback(err);
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} finally {
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out = [];
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syntax = 3;
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}
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}
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function push(line) {
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if (line === "")
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out.push("");
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else {
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var ind = "";
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for (var i = 0; i < indent; ++i)
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ind += " ";
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out.push(ind + line);
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}
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}
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function escape(str) {
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return str.replace(/[\\"']/g, "\\$&")
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.replace(/\r/g, "\\r")
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.replace(/\n/g, "\\n")
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.replace(/\u0000/g, "\\0"); // eslint-disable-line no-control-regex
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}
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function value(v) {
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switch (typeof v) {
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case "boolean":
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return v ? "true" : "false";
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case "number":
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return v.toString();
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default:
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return "\"" + escape(String(v)) + "\"";
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}
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}
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function buildRoot(root) {
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root.resolveAll();
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var pkg = [];
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var ptr = root;
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var repeat = true;
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do {
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var nested = ptr.nestedArray;
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if (nested.length === 1 && nested[0] instanceof Namespace && !(nested[0] instanceof Type || nested[0] instanceof Service)) {
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ptr = nested[0];
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if (ptr !== root)
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pkg.push(ptr.name);
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} else
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repeat = false;
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} while (repeat);
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out.push("syntax = \"proto" + syntax + "\";");
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if (pkg.length)
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out.push("", "package " + pkg.join(".") + ";");
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buildOptions(ptr);
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ptr.nestedArray.forEach(build);
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}
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function build(object) {
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if (object instanceof Enum)
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buildEnum(object);
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else if (object instanceof Type)
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buildType(object);
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else if (object instanceof Field)
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buildField(object);
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else if (object instanceof OneOf)
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buildOneOf(object);
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else if (object instanceof Service)
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buildService(object);
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else if (object instanceof Method)
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buildMethod(object);
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else
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buildNamespace(object);
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}
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function buildNamespace(namespace) { // just a namespace, not a type etc.
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push("");
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push("message " + namespace.name + " {");
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++indent;
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buildOptions(namespace);
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consolidateExtends(namespace.nestedArray).remaining.forEach(build);
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--indent;
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push("}");
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}
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function buildEnum(enm) {
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push("");
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push("enum " + enm.name + " {");
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buildOptions(enm);
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++indent; first = true;
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Object.keys(enm.values).forEach(function(name) {
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var val = enm.values[name];
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if (first) {
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push("");
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first = false;
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}
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push(name + " = " + val + ";");
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});
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--indent; first = false;
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push("}");
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}
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function buildRanges(keyword, ranges) {
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if (ranges && ranges.length) {
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var parts = [];
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ranges.forEach(function(range) {
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if (typeof range === "string")
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parts.push("\"" + escape(range) + "\"");
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else if (range[0] === range[1])
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parts.push(range[0]);
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else
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parts.push(range[0] + " to " + (range[1] === 0x1FFFFFFF ? "max" : range[1]));
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});
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push("");
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push(keyword + " " + parts.join(", ") + ";");
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}
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}
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function buildType(type) {
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if (type.group)
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return; // built with the sister-field
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push("");
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push("message " + type.name + " {");
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++indent;
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buildOptions(type);
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type.oneofsArray.forEach(build);
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first = true;
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type.fieldsArray.forEach(build);
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consolidateExtends(type.nestedArray).remaining.forEach(build);
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buildRanges("extensions", type.extensions);
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buildRanges("reserved", type.reserved);
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--indent;
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push("}");
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}
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function buildField(field, passExtend) {
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if (field.partOf || field.declaringField || field.extend !== undefined && !passExtend)
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return;
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if (first) {
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first = false;
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push("");
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}
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if (field.resolvedType && field.resolvedType.group) {
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buildGroup(field);
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return;
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}
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var sb = [];
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if (field.map)
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sb.push("map<" + field.keyType + ", " + field.type + ">");
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else if (field.repeated)
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sb.push("repeated", field.type);
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else if (syntax === 2 || field.parent.group)
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sb.push(field.required ? "required" : "optional", field.type);
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else
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sb.push(field.type);
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sb.push(underScore(field.name), "=", field.id);
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var opts = buildFieldOptions(field);
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if (opts)
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sb.push(opts);
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push(sb.join(" ") + ";");
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}
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function buildGroup(field) {
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push(field.rule + " group " + field.resolvedType.name + " = " + field.id + " {");
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++indent;
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buildOptions(field.resolvedType);
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first = true;
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field.resolvedType.fieldsArray.forEach(function(field) {
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buildField(field);
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});
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--indent;
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push("}");
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}
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function buildFieldOptions(field) {
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var keys;
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if (!field.options || !(keys = Object.keys(field.options)).length)
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return null;
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var sb = [];
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keys.forEach(function(key) {
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var val = field.options[key];
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var wireType = types.packed[field.resolvedType instanceof Enum ? "int32" : field.type];
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switch (key) {
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case "packed":
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val = Boolean(val);
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// skip when not packable or syntax default
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if (wireType === undefined || syntax === 3 === val)
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return;
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break;
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case "default":
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if (syntax === 3)
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return;
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// skip default (resolved) default values
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if (field.long && !util.longNeq(field.defaultValue, types.defaults[field.type]) || !field.long && field.defaultValue === types.defaults[field.type])
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return;
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// enum defaults specified as strings are type references and not enclosed in quotes
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if (field.resolvedType instanceof Enum)
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break;
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// otherwise fallthrough
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default:
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val = value(val);
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break;
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}
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sb.push(key + "=" + val);
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});
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return sb.length
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? "[" + sb.join(", ") + "]"
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: null;
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}
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function consolidateExtends(nested) {
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var ext = {};
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nested = nested.filter(function(obj) {
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if (!(obj instanceof Field) || obj.extend === undefined)
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return true;
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(ext[obj.extend] || (ext[obj.extend] = [])).push(obj);
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return false;
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});
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Object.keys(ext).forEach(function(extend) {
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push("");
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push("extend " + extend + " {");
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++indent; first = true;
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ext[extend].forEach(function(field) {
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buildField(field, true);
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});
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--indent;
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push("}");
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});
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return {
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remaining: nested
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};
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}
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function buildOneOf(oneof) {
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push("");
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push("oneof " + underScore(oneof.name) + " {");
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++indent; first = true;
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oneof.oneof.forEach(function(fieldName) {
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var field = oneof.parent.get(fieldName);
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if (first) {
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first = false;
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push("");
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}
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var opts = buildFieldOptions(field);
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push(field.type + " " + underScore(field.name) + " = " + field.id + (opts ? " " + opts : "") + ";");
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});
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--indent;
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push("}");
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}
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function buildService(service) {
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push("service " + service.name + " {");
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++indent;
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service.methodsArray.forEach(build);
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consolidateExtends(service.nestedArray).remaining.forEach(build);
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--indent;
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push("}");
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}
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function buildMethod(method) {
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push(method.type + " " + method.name + " (" + (method.requestStream ? "stream " : "") + method.requestType + ") returns (" + (method.responseStream ? "stream " : "") + method.responseType + ");");
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}
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function buildOptions(object) {
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if (!object.options)
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return;
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first = true;
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Object.keys(object.options).forEach(function(key) {
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if (first) {
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first = false;
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push("");
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}
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var val = object.options[key];
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push("option " + key + " = " + JSON.stringify(val) + ";");
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});
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}
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