json-express
Version:
Parse JSON expression and transform into another forms.
233 lines (232 loc) • 11.3 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
var __spreadArrays = (this && this.__spreadArrays) || function () {
for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
for (var r = Array(s), k = 0, i = 0; i < il; i++)
for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
r[k] = a[j];
return r;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var md5_1 = __importDefault(require("md5"));
var template_parser_1 = __importDefault(require("./template-parser"));
var builtin_template_pipes_1 = __importDefault(require("./builtin-template-pipes"));
var TemplateExpressionProgram = /** @class */ (function () {
function TemplateExpressionProgram() {
this.instructions = [];
}
TemplateExpressionProgram.prototype.add = function (opcode, n, v) {
if (n === void 0) { n = null; }
if (v === void 0) { v = null; }
this.instructions.push({ opcode: opcode, n: n, v: v });
};
TemplateExpressionProgram.prototype.addn = function (opcode, n) {
this.instructions.push({ opcode: opcode, n: n });
};
TemplateExpressionProgram.prototype.addv = function (opcode, v) {
this.instructions.push({ opcode: opcode, v: v });
};
return TemplateExpressionProgram;
}());
var TemplateExpression = /** @class */ (function () {
function TemplateExpression(source) {
var parsedRoot = template_parser_1.default.parse(source);
this.source = source;
this.program = TemplateExpression.compile(parsedRoot);
}
TemplateExpression.prototype.execute = function (context) {
return __awaiter(this, void 0, void 0, function () {
var instructions, stack, _i, instructions_1, instruction, _a, str, i, binding, v, i, args, v, pipeHandler, r, _b, _c, _d;
return __generator(this, function (_e) {
switch (_e.label) {
case 0:
instructions = this.program.instructions;
stack = [];
_i = 0, instructions_1 = instructions;
_e.label = 1;
case 1:
if (!(_i < instructions_1.length)) return [3 /*break*/, 12];
instruction = instructions_1[_i];
_a = instruction.opcode;
switch (_a) {
case 0 /* PUSH */: return [3 /*break*/, 2];
case 1 /* STRCONCAT */: return [3 /*break*/, 3];
case 2 /* FETCH */: return [3 /*break*/, 4];
case 3 /* PIPE */: return [3 /*break*/, 5];
case 4 /* END */: return [3 /*break*/, 9];
}
return [3 /*break*/, 10];
case 2:
{
stack.push(instruction.v);
return [3 /*break*/, 11];
}
_e.label = 3;
case 3:
{
str = '';
for (i = 0; i < instruction.n; i++) {
str = String(stack.pop()) + str;
}
stack.push(str);
return [3 /*break*/, 11];
}
_e.label = 4;
case 4:
{
binding = instruction.v;
v = context[binding[0]];
if (v === undefined) {
throw new Error('Undefined variable: ' + binding[0]);
}
for (i = 1; i < binding.length; i++) {
v = v[binding[i]];
}
stack.push(v);
return [3 /*break*/, 11];
}
_e.label = 5;
case 5:
args = stack.splice(stack.length - instruction.n, instruction.n);
v = stack.pop();
pipeHandler = TemplateExpression.pipeHandlers[instruction.v];
if (!pipeHandler) {
throw new Error('Undefined pipe handler: ' + instruction.v);
}
r = pipeHandler.apply(void 0, __spreadArrays([v], args));
_c = (_b = stack).push;
if (!(r instanceof Promise)) return [3 /*break*/, 7];
return [4 /*yield*/, r];
case 6:
_d = _e.sent();
return [3 /*break*/, 8];
case 7:
_d = r;
_e.label = 8;
case 8:
_c.apply(_b, [_d]);
return [3 /*break*/, 11];
case 9:
{
return [2 /*return*/, stack.pop()];
}
_e.label = 10;
case 10: throw new Error('Invalid instruction');
case 11:
_i++;
return [3 /*break*/, 1];
case 12: return [2 /*return*/, stack.pop()];
}
});
});
};
TemplateExpression.compile = function (root) {
var program = new TemplateExpressionProgram();
if (root.type === "RETURNING_STRING" /* RETURNING_STRING */) {
TemplateExpression.compileExpressionNode(root.children[0], program);
}
else {
for (var _i = 0, _a = root.children; _i < _a.length; _i++) {
var node = _a[_i];
if (node.type === "TEXT" /* TEXT */ || node.type === "NUMBER" /* NUMBER */) {
program.addv(0 /* PUSH */, node.value);
}
else {
TemplateExpression.compileExpressionNode(node, program);
}
}
if (root.children.length > 1) {
program.addn(1 /* STRCONCAT */, root.children.length);
}
}
program.add(4 /* END */);
return program;
};
TemplateExpression.compileBindingNode = function (bindingNode, program) {
program.addv(2 /* FETCH */, bindingNode.children.map(function (node) { return node.value; }));
};
TemplateExpression.compileExpressionNode = function (node, program) {
TemplateExpression.compileBindingNode(node.children[0], program);
for (var i = 1; i < node.children.length; i++) {
var pipeNode = node.children[i];
for (var j = 1; j < pipeNode.children.length; j++) {
var argNode = pipeNode.children[j];
if (argNode.type === "BINDING" /* BINDING */) {
TemplateExpression.compileBindingNode(argNode, program);
}
else {
program.addv(0 /* PUSH */, argNode.value);
}
}
program.add(3 /* PIPE */, pipeNode.children.length - 1, pipeNode.value);
}
};
TemplateExpression.cache = function (source, context) {
if (context === void 0) { context = {}; }
return __awaiter(this, void 0, void 0, function () {
var hash, t;
return __generator(this, function (_a) {
hash = md5_1.default(source);
t = null;
if (TemplateExpression.templateCache.has(hash)) {
t = TemplateExpression.templateCache.get(hash);
}
else {
t = new TemplateExpression(source);
TemplateExpression.templateCache.set(hash, t);
}
return [2 /*return*/, t.execute(context)];
});
});
};
TemplateExpression.addPipeHandler = function (name, handler) {
TemplateExpression.pipeHandlers[name] = handler;
};
TemplateExpression.removePipeHandler = function (name) {
if (name in TemplateExpression.pipeHandlers) {
delete TemplateExpression.pipeHandlers[name];
}
};
TemplateExpression.templateCache = new Map();
TemplateExpression.pipeHandlers = Object.assign({}, builtin_template_pipes_1.default);
return TemplateExpression;
}());
exports.default = TemplateExpression;