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scope.js
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Mon, Feb 3, 22:30

scope.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ValueScope = exports.ValueScopeName = exports.Scope = exports.varKinds = exports.UsedValueState = void 0;
const code_1 = require("./code");
class ValueError extends Error {
constructor(name) {
super(`CodeGen: "code" for ${name} not defined`);
this.value = name.value;
}
}
var UsedValueState;
(function (UsedValueState) {
UsedValueState[UsedValueState["Started"] = 0] = "Started";
UsedValueState[UsedValueState["Completed"] = 1] = "Completed";
})(UsedValueState = exports.UsedValueState || (exports.UsedValueState = {}));
exports.varKinds = {
const: new code_1.Name("const"),
let: new code_1.Name("let"),
var: new code_1.Name("var"),
};
class Scope {
constructor({ prefixes, parent } = {}) {
this._names = {};
this._prefixes = prefixes;
this._parent = parent;
}
toName(nameOrPrefix) {
return nameOrPrefix instanceof code_1.Name ? nameOrPrefix : this.name(nameOrPrefix);
}
name(prefix) {
return new code_1.Name(this._newName(prefix));
}
_newName(prefix) {
const ng = this._names[prefix] || this._nameGroup(prefix);
return `${prefix}${ng.index++}`;
}
_nameGroup(prefix) {
var _a, _b;
if (((_b = (_a = this._parent) === null || _a === void 0 ? void 0 : _a._prefixes) === null || _b === void 0 ? void 0 : _b.has(prefix)) || (this._prefixes && !this._prefixes.has(prefix))) {
throw new Error(`CodeGen: prefix "${prefix}" is not allowed in this scope`);
}
return (this._names[prefix] = { prefix, index: 0 });
}
}
exports.Scope = Scope;
class ValueScopeName extends code_1.Name {
constructor(prefix, nameStr) {
super(nameStr);
this.prefix = prefix;
}
setValue(value, { property, itemIndex }) {
this.value = value;
this.scopePath = (0, code_1._) `.${new code_1.Name(property)}[${itemIndex}]`;
}
}
exports.ValueScopeName = ValueScopeName;
const line = (0, code_1._) `\n`;
class ValueScope extends Scope {
constructor(opts) {
super(opts);
this._values = {};
this._scope = opts.scope;
this.opts = { ...opts, _n: opts.lines ? line : code_1.nil };
}
get() {
return this._scope;
}
name(prefix) {
return new ValueScopeName(prefix, this._newName(prefix));
}
value(nameOrPrefix, value) {
var _a;
if (value.ref === undefined)
throw new Error("CodeGen: ref must be passed in value");
const name = this.toName(nameOrPrefix);
const { prefix } = name;
const valueKey = (_a = value.key) !== null && _a !== void 0 ? _a : value.ref;
let vs = this._values[prefix];
if (vs) {
const _name = vs.get(valueKey);
if (_name)
return _name;
}
else {
vs = this._values[prefix] = new Map();
}
vs.set(valueKey, name);
const s = this._scope[prefix] || (this._scope[prefix] = []);
const itemIndex = s.length;
s[itemIndex] = value.ref;
name.setValue(value, { property: prefix, itemIndex });
return name;
}
getValue(prefix, keyOrRef) {
const vs = this._values[prefix];
if (!vs)
return;
return vs.get(keyOrRef);
}
scopeRefs(scopeName, values = this._values) {
return this._reduceValues(values, (name) => {
if (name.scopePath === undefined)
throw new Error(`CodeGen: name "${name}" has no value`);
return (0, code_1._) `${scopeName}${name.scopePath}`;
});
}
scopeCode(values = this._values, usedValues, getCode) {
return this._reduceValues(values, (name) => {
if (name.value === undefined)
throw new Error(`CodeGen: name "${name}" has no value`);
return name.value.code;
}, usedValues, getCode);
}
_reduceValues(values, valueCode, usedValues = {}, getCode) {
let code = code_1.nil;
for (const prefix in values) {
const vs = values[prefix];
if (!vs)
continue;
const nameSet = (usedValues[prefix] = usedValues[prefix] || new Map());
vs.forEach((name) => {
if (nameSet.has(name))
return;
nameSet.set(name, UsedValueState.Started);
let c = valueCode(name);
if (c) {
const def = this.opts.es5 ? exports.varKinds.var : exports.varKinds.const;
code = (0, code_1._) `${code}${def} ${name} = ${c};${this.opts._n}`;
}
else if ((c = getCode === null || getCode === void 0 ? void 0 : getCode(name))) {
code = (0, code_1._) `${code}${c}${this.opts._n}`;
}
else {
throw new ValueError(name);
}
nameSet.set(name, UsedValueState.Completed);
});
}
return code;
}
}
exports.ValueScope = ValueScope;
//# sourceMappingURL=scope.js.map

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