68 lines
1.6 KiB
JavaScript
68 lines
1.6 KiB
JavaScript
module.exports = Scope;
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var traverse = require("./index");
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var t = require("../types");
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var _ = require("lodash");
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function Scope(parent, block) {
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this.parent = parent;
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this.block = block;
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this.ids = block._scopeIds = block._scopeIds || Scope.getIds(block);
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}
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Scope.getIds = function (block) {
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var ids = {};
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if (t.isBlockStatement(block)) {
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_.each(block.body, function (node) {
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if (t.isVariableDeclaration(node) && node.kind !== "var") {
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_.merge(ids, t.getIds(node, true));
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}
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});
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} else if (t.isProgram(block) || t.isFunction(block)) {
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traverse(block, function (node, parent) {
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if (parent !== block && t.isVariableDeclaration(node) && node.kind !== "var") {
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return;
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}
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if (t.isDeclaration(node)) {
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_.merge(ids, t.getIds(node, true));
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} else if (t.isFunction(node)) {
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return false;
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}
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});
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}
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if (t.isFunction(block)) {
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_.each(block.params, function (param) {
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_.merge(ids, t.getIds(param, true));
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});
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}
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return ids;
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};
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Scope.prototype.get = function (id) {
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return id && (this.getOwn(id) || this.parentGet(id));
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};
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Scope.prototype.getOwn = function (id) {
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return _.has(this.ids, id) && this.ids[id];
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};
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Scope.prototype.parentGet = function (id) {
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return this.parent && this.parent.get(id);
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};
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Scope.prototype.has = function (id) {
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return id && (this.hasOwn(id) || this.parentHas(id));
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};
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Scope.prototype.hasOwn = function (id) {
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return !!this.getOwn(id);
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};
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Scope.prototype.parentHas = function (id) {
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return this.parent && this.parent.has(id);
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};
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