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index.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.or = exports.and = exports.not = exports.CodeGen = exports.operators = exports.varKinds = exports.ValueScopeName = exports.ValueScope = exports.Scope = exports.Name = exports.regexpCode = exports.stringify = exports.getProperty = exports.nil = exports.strConcat = exports.str = exports._ = void 0;
const code_1 = require("./code");
const scope_1 = require("./scope");
var code_2 = require("./code");
Object.defineProperty(exports, "_", { enumerable: true, get: function () { return code_2._; } });
Object.defineProperty(exports, "str", { enumerable: true, get: function () { return code_2.str; } });
Object.defineProperty(exports, "strConcat", { enumerable: true, get: function () { return code_2.strConcat; } });
Object.defineProperty(exports, "nil", { enumerable: true, get: function () { return code_2.nil; } });
Object.defineProperty(exports, "getProperty", { enumerable: true, get: function () { return code_2.getProperty; } });
Object.defineProperty(exports, "stringify", { enumerable: true, get: function () { return code_2.stringify; } });
Object.defineProperty(exports, "regexpCode", { enumerable: true, get: function () { return code_2.regexpCode; } });
Object.defineProperty(exports, "Name", { enumerable: true, get: function () { return code_2.Name; } });
var scope_2 = require("./scope");
Object.defineProperty(exports, "Scope", { enumerable: true, get: function () { return scope_2.Scope; } });
Object.defineProperty(exports, "ValueScope", { enumerable: true, get: function () { return scope_2.ValueScope; } });
Object.defineProperty(exports, "ValueScopeName", { enumerable: true, get: function () { return scope_2.ValueScopeName; } });
Object.defineProperty(exports, "varKinds", { enumerable: true, get: function () { return scope_2.varKinds; } });
exports.operators = {
GT: new code_1._Code(">"),
GTE: new code_1._Code(">="),
LT: new code_1._Code("<"),
LTE: new code_1._Code("<="),
EQ: new code_1._Code("==="),
NEQ: new code_1._Code("!=="),
NOT: new code_1._Code("!"),
OR: new code_1._Code("||"),
AND: new code_1._Code("&&"),
ADD: new code_1._Code("+"),
};
class Node {
optimizeNodes() {
return this;
}
optimizeNames(_names, _constants) {
return this;
}
}
class Def extends Node {
constructor(varKind, name, rhs) {
super();
this.varKind = varKind;
this.name = name;
this.rhs = rhs;
}
render({ es5, _n }) {
const varKind = es5 ? scope_1.varKinds.var : this.varKind;
const rhs = this.rhs === undefined ? "" : ` = ${this.rhs}`;
return `${varKind} ${this.name}${rhs};` + _n;
}
optimizeNames(names, constants) {
if (!names[this.name.str])
return;
if (this.rhs)
this.rhs = optimizeExpr(this.rhs, names, constants);
return this;
}
get names() {
return this.rhs instanceof code_1._CodeOrName ? this.rhs.names : {};
}
}
class Assign extends Node {
constructor(lhs, rhs, sideEffects) {
super();
this.lhs = lhs;
this.rhs = rhs;
this.sideEffects = sideEffects;
}
render({ _n }) {
return `${this.lhs} = ${this.rhs};` + _n;
}
optimizeNames(names, constants) {
if (this.lhs instanceof code_1.Name && !names[this.lhs.str] && !this.sideEffects)
return;
this.rhs = optimizeExpr(this.rhs, names, constants);
return this;
}
get names() {
const names = this.lhs instanceof code_1.Name ? {} : { ...this.lhs.names };
return addExprNames(names, this.rhs);
}
}
class AssignOp extends Assign {
constructor(lhs, op, rhs, sideEffects) {
super(lhs, rhs, sideEffects);
this.op = op;
}
render({ _n }) {
return `${this.lhs} ${this.op}= ${this.rhs};` + _n;
}
}
class Label extends Node {
constructor(label) {
super();
this.label = label;
this.names = {};
}
render({ _n }) {
return `${this.label}:` + _n;
}
}
class Break extends Node {
constructor(label) {
super();
this.label = label;
this.names = {};
}
render({ _n }) {
const label = this.label ? ` ${this.label}` : "";
return `break${label};` + _n;
}
}
class Throw extends Node {
constructor(error) {
super();
this.error = error;
}
render({ _n }) {
return `throw ${this.error};` + _n;
}
get names() {
return this.error.names;
}
}
class AnyCode extends Node {
constructor(code) {
super();
this.code = code;
}
render({ _n }) {
return `${this.code};` + _n;
}
optimizeNodes() {
return `${this.code}` ? this : undefined;
}
optimizeNames(names, constants) {
this.code = optimizeExpr(this.code, names, constants);
return this;
}
get names() {
return this.code instanceof code_1._CodeOrName ? this.code.names : {};
}
}
class ParentNode extends Node {
constructor(nodes = []) {
super();
this.nodes = nodes;
}
render(opts) {
return this.nodes.reduce((code, n) => code + n.render(opts), "");
}
optimizeNodes() {
const { nodes } = this;
let i = nodes.length;
while (i--) {
const n = nodes[i].optimizeNodes();
if (Array.isArray(n))
nodes.splice(i, 1, ...n);
else if (n)
nodes[i] = n;
else
nodes.splice(i, 1);
}
return nodes.length > 0 ? this : undefined;
}
optimizeNames(names, constants) {
const { nodes } = this;
let i = nodes.length;
while (i--) {
// iterating backwards improves 1-pass optimization
const n = nodes[i];
if (n.optimizeNames(names, constants))
continue;
subtractNames(names, n.names);
nodes.splice(i, 1);
}
return nodes.length > 0 ? this : undefined;
}
get names() {
return this.nodes.reduce((names, n) => addNames(names, n.names), {});
}
}
class BlockNode extends ParentNode {
render(opts) {
return "{" + opts._n + super.render(opts) + "}" + opts._n;
}
}
class Root extends ParentNode {
}
class Else extends BlockNode {
}
Else.kind = "else";
class If extends BlockNode {
constructor(condition, nodes) {
super(nodes);
this.condition = condition;
}
render(opts) {
let code = `if(${this.condition})` + super.render(opts);
if (this.else)
code += "else " + this.else.render(opts);
return code;
}
optimizeNodes() {
super.optimizeNodes();
const cond = this.condition;
if (cond === true)
return this.nodes; // else is ignored here
let e = this.else;
if (e) {
const ns = e.optimizeNodes();
e = this.else = Array.isArray(ns) ? new Else(ns) : ns;
}
if (e) {
if (cond === false)
return e instanceof If ? e : e.nodes;
if (this.nodes.length)
return this;
return new If(not(cond), e instanceof If ? [e] : e.nodes);
}
if (cond === false || !this.nodes.length)
return undefined;
return this;
}
optimizeNames(names, constants) {
var _a;
this.else = (_a = this.else) === null || _a === void 0 ? void 0 : _a.optimizeNames(names, constants);
if (!(super.optimizeNames(names, constants) || this.else))
return;
this.condition = optimizeExpr(this.condition, names, constants);
return this;
}
get names() {
const names = super.names;
addExprNames(names, this.condition);
if (this.else)
addNames(names, this.else.names);
return names;
}
}
If.kind = "if";
class For extends BlockNode {
}
For.kind = "for";
class ForLoop extends For {
constructor(iteration) {
super();
this.iteration = iteration;
}
render(opts) {
return `for(${this.iteration})` + super.render(opts);
}
optimizeNames(names, constants) {
if (!super.optimizeNames(names, constants))
return;
this.iteration = optimizeExpr(this.iteration, names, constants);
return this;
}
get names() {
return addNames(super.names, this.iteration.names);
}
}
class ForRange extends For {
constructor(varKind, name, from, to) {
super();
this.varKind = varKind;
this.name = name;
this.from = from;
this.to = to;
}
render(opts) {
const varKind = opts.es5 ? scope_1.varKinds.var : this.varKind;
const { name, from, to } = this;
return `for(${varKind} ${name}=${from}; ${name}<${to}; ${name}++)` + super.render(opts);
}
get names() {
const names = addExprNames(super.names, this.from);
return addExprNames(names, this.to);
}
}
class ForIter extends For {
constructor(loop, varKind, name, iterable) {
super();
this.loop = loop;
this.varKind = varKind;
this.name = name;
this.iterable = iterable;
}
render(opts) {
return `for(${this.varKind} ${this.name} ${this.loop} ${this.iterable})` + super.render(opts);
}
optimizeNames(names, constants) {
if (!super.optimizeNames(names, constants))
return;
this.iterable = optimizeExpr(this.iterable, names, constants);
return this;
}
get names() {
return addNames(super.names, this.iterable.names);
}
}
class Func extends BlockNode {
constructor(name, args, async) {
super();
this.name = name;
this.args = args;
this.async = async;
}
render(opts) {
const _async = this.async ? "async " : "";
return `${_async}function ${this.name}(${this.args})` + super.render(opts);
}
}
Func.kind = "func";
class Return extends ParentNode {
render(opts) {
return "return " + super.render(opts);
}
}
Return.kind = "return";
class Try extends BlockNode {
render(opts) {
let code = "try" + super.render(opts);
if (this.catch)
code += this.catch.render(opts);
if (this.finally)
code += this.finally.render(opts);
return code;
}
optimizeNodes() {
var _a, _b;
super.optimizeNodes();
(_a = this.catch) === null || _a === void 0 ? void 0 : _a.optimizeNodes();
(_b = this.finally) === null || _b === void 0 ? void 0 : _b.optimizeNodes();
return this;
}
optimizeNames(names, constants) {
var _a, _b;
super.optimizeNames(names, constants);
(_a = this.catch) === null || _a === void 0 ? void 0 : _a.optimizeNames(names, constants);
(_b = this.finally) === null || _b === void 0 ? void 0 : _b.optimizeNames(names, constants);
return this;
}
get names() {
const names = super.names;
if (this.catch)
addNames(names, this.catch.names);
if (this.finally)
addNames(names, this.finally.names);
return names;
}
}
class Catch extends BlockNode {
constructor(error) {
super();
this.error = error;
}
render(opts) {
return `catch(${this.error})` + super.render(opts);
}
}
Catch.kind = "catch";
class Finally extends BlockNode {
render(opts) {
return "finally" + super.render(opts);
}
}
Finally.kind = "finally";
class CodeGen {
constructor(extScope, opts = {}) {
this._values = {};
this._blockStarts = [];
this._constants = {};
this.opts = { ...opts, _n: opts.lines ? "\n" : "" };
this._extScope = extScope;
this._scope = new scope_1.Scope({ parent: extScope });
this._nodes = [new Root()];
}
toString() {
return this._root.render(this.opts);
}
// returns unique name in the internal scope
name(prefix) {
return this._scope.name(prefix);
}
// reserves unique name in the external scope
scopeName(prefix) {
return this._extScope.name(prefix);
}
// reserves unique name in the external scope and assigns value to it
scopeValue(prefixOrName, value) {
const name = this._extScope.value(prefixOrName, value);
const vs = this._values[name.prefix] || (this._values[name.prefix] = new Set());
vs.add(name);
return name;
}
getScopeValue(prefix, keyOrRef) {
return this._extScope.getValue(prefix, keyOrRef);
}
// return code that assigns values in the external scope to the names that are used internally
// (same names that were returned by gen.scopeName or gen.scopeValue)
scopeRefs(scopeName) {
return this._extScope.scopeRefs(scopeName, this._values);
}
scopeCode() {
return this._extScope.scopeCode(this._values);
}
_def(varKind, nameOrPrefix, rhs, constant) {
const name = this._scope.toName(nameOrPrefix);
if (rhs !== undefined && constant)
this._constants[name.str] = rhs;
this._leafNode(new Def(varKind, name, rhs));
return name;
}
// `const` declaration (`var` in es5 mode)
const(nameOrPrefix, rhs, _constant) {
return this._def(scope_1.varKinds.const, nameOrPrefix, rhs, _constant);
}
// `let` declaration with optional assignment (`var` in es5 mode)
let(nameOrPrefix, rhs, _constant) {
return this._def(scope_1.varKinds.let, nameOrPrefix, rhs, _constant);
}
// `var` declaration with optional assignment
var(nameOrPrefix, rhs, _constant) {
return this._def(scope_1.varKinds.var, nameOrPrefix, rhs, _constant);
}
// assignment code
assign(lhs, rhs, sideEffects) {
return this._leafNode(new Assign(lhs, rhs, sideEffects));
}
// `+=` code
add(lhs, rhs) {
return this._leafNode(new AssignOp(lhs, exports.operators.ADD, rhs));
}
// appends passed SafeExpr to code or executes Block
code(c) {
if (typeof c == "function")
c();
else if (c !== code_1.nil)
this._leafNode(new AnyCode(c));
return this;
}
// returns code for object literal for the passed argument list of key-value pairs
object(...keyValues) {
const code = ["{"];
for (const [key, value] of keyValues) {
if (code.length > 1)
code.push(",");
code.push(key);
if (key !== value || this.opts.es5) {
code.push(":");
(0, code_1.addCodeArg)(code, value);
}
}
code.push("}");
return new code_1._Code(code);
}
// `if` clause (or statement if `thenBody` and, optionally, `elseBody` are passed)
if(condition, thenBody, elseBody) {
this._blockNode(new If(condition));
if (thenBody && elseBody) {
this.code(thenBody).else().code(elseBody).endIf();
}
else if (thenBody) {
this.code(thenBody).endIf();
}
else if (elseBody) {
throw new Error('CodeGen: "else" body without "then" body');
}
return this;
}
// `else if` clause - invalid without `if` or after `else` clauses
elseIf(condition) {
return this._elseNode(new If(condition));
}
// `else` clause - only valid after `if` or `else if` clauses
else() {
return this._elseNode(new Else());
}
// end `if` statement (needed if gen.if was used only with condition)
endIf() {
return this._endBlockNode(If, Else);
}
_for(node, forBody) {
this._blockNode(node);
if (forBody)
this.code(forBody).endFor();
return this;
}
// a generic `for` clause (or statement if `forBody` is passed)
for(iteration, forBody) {
return this._for(new ForLoop(iteration), forBody);
}
// `for` statement for a range of values
forRange(nameOrPrefix, from, to, forBody, varKind = this.opts.es5 ? scope_1.varKinds.var : scope_1.varKinds.let) {
const name = this._scope.toName(nameOrPrefix);
return this._for(new ForRange(varKind, name, from, to), () => forBody(name));
}
// `for-of` statement (in es5 mode replace with a normal for loop)
forOf(nameOrPrefix, iterable, forBody, varKind = scope_1.varKinds.const) {
const name = this._scope.toName(nameOrPrefix);
if (this.opts.es5) {
const arr = iterable instanceof code_1.Name ? iterable : this.var("_arr", iterable);
return this.forRange("_i", 0, (0, code_1._) `${arr}.length`, (i) => {
this.var(name, (0, code_1._) `${arr}[${i}]`);
forBody(name);
});
}
return this._for(new ForIter("of", varKind, name, iterable), () => forBody(name));
}
// `for-in` statement.
// With option `ownProperties` replaced with a `for-of` loop for object keys
forIn(nameOrPrefix, obj, forBody, varKind = this.opts.es5 ? scope_1.varKinds.var : scope_1.varKinds.const) {
if (this.opts.ownProperties) {
return this.forOf(nameOrPrefix, (0, code_1._) `Object.keys(${obj})`, forBody);
}
const name = this._scope.toName(nameOrPrefix);
return this._for(new ForIter("in", varKind, name, obj), () => forBody(name));
}
// end `for` loop
endFor() {
return this._endBlockNode(For);
}
// `label` statement
label(label) {
return this._leafNode(new Label(label));
}
// `break` statement
break(label) {
return this._leafNode(new Break(label));
}
// `return` statement
return(value) {
const node = new Return();
this._blockNode(node);
this.code(value);
if (node.nodes.length !== 1)
throw new Error('CodeGen: "return" should have one node');
return this._endBlockNode(Return);
}
// `try` statement
try(tryBody, catchCode, finallyCode) {
if (!catchCode && !finallyCode)
throw new Error('CodeGen: "try" without "catch" and "finally"');
const node = new Try();
this._blockNode(node);
this.code(tryBody);
if (catchCode) {
const error = this.name("e");
this._currNode = node.catch = new Catch(error);
catchCode(error);
}
if (finallyCode) {
this._currNode = node.finally = new Finally();
this.code(finallyCode);
}
return this._endBlockNode(Catch, Finally);
}
// `throw` statement
throw(error) {
return this._leafNode(new Throw(error));
}
// start self-balancing block
block(body, nodeCount) {
this._blockStarts.push(this._nodes.length);
if (body)
this.code(body).endBlock(nodeCount);
return this;
}
// end the current self-balancing block
endBlock(nodeCount) {
const len = this._blockStarts.pop();
if (len === undefined)
throw new Error("CodeGen: not in self-balancing block");
const toClose = this._nodes.length - len;
if (toClose < 0 || (nodeCount !== undefined && toClose !== nodeCount)) {
throw new Error(`CodeGen: wrong number of nodes: ${toClose} vs ${nodeCount} expected`);
}
this._nodes.length = len;
return this;
}
// `function` heading (or definition if funcBody is passed)
func(name, args = code_1.nil, async, funcBody) {
this._blockNode(new Func(name, args, async));
if (funcBody)
this.code(funcBody).endFunc();
return this;
}
// end function definition
endFunc() {
return this._endBlockNode(Func);
}
optimize(n = 1) {
while (n-- > 0) {
this._root.optimizeNodes();
this._root.optimizeNames(this._root.names, this._constants);
}
}
_leafNode(node) {
this._currNode.nodes.push(node);
return this;
}
_blockNode(node) {
this._currNode.nodes.push(node);
this._nodes.push(node);
}
_endBlockNode(N1, N2) {
const n = this._currNode;
if (n instanceof N1 || (N2 && n instanceof N2)) {
this._nodes.pop();
return this;
}
throw new Error(`CodeGen: not in block "${N2 ? `${N1.kind}/${N2.kind}` : N1.kind}"`);
}
_elseNode(node) {
const n = this._currNode;
if (!(n instanceof If)) {
throw new Error('CodeGen: "else" without "if"');
}
this._currNode = n.else = node;
return this;
}
get _root() {
return this._nodes[0];
}
get _currNode() {
const ns = this._nodes;
return ns[ns.length - 1];
}
set _currNode(node) {
const ns = this._nodes;
ns[ns.length - 1] = node;
}
}
exports.CodeGen = CodeGen;
function addNames(names, from) {
for (const n in from)
names[n] = (names[n] || 0) + (from[n] || 0);
return names;
}
function addExprNames(names, from) {
return from instanceof code_1._CodeOrName ? addNames(names, from.names) : names;
}
function optimizeExpr(expr, names, constants) {
if (expr instanceof code_1.Name)
return replaceName(expr);
if (!canOptimize(expr))
return expr;
return new code_1._Code(expr._items.reduce((items, c) => {
if (c instanceof code_1.Name)
c = replaceName(c);
if (c instanceof code_1._Code)
items.push(...c._items);
else
items.push(c);
return items;
}, []));
function replaceName(n) {
const c = constants[n.str];
if (c === undefined || names[n.str] !== 1)
return n;
delete names[n.str];
return c;
}
function canOptimize(e) {
return (e instanceof code_1._Code &&
e._items.some((c) => c instanceof code_1.Name && names[c.str] === 1 && constants[c.str] !== undefined));
}
}
function subtractNames(names, from) {
for (const n in from)
names[n] = (names[n] || 0) - (from[n] || 0);
}
function not(x) {
return typeof x == "boolean" || typeof x == "number" || x === null ? !x : (0, code_1._) `!${par(x)}`;
}
exports.not = not;
const andCode = mappend(exports.operators.AND);
// boolean AND (&&) expression with the passed arguments
function and(...args) {
return args.reduce(andCode);
}
exports.and = and;
const orCode = mappend(exports.operators.OR);
// boolean OR (||) expression with the passed arguments
function or(...args) {
return args.reduce(orCode);
}
exports.or = or;
function mappend(op) {
return (x, y) => (x === code_1.nil ? y : y === code_1.nil ? x : (0, code_1._) `${par(x)} ${op} ${par(y)}`);
}
function par(x) {
return x instanceof code_1.Name ? x : (0, code_1._) `(${x})`;
}
//# sourceMappingURL=index.js.map

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