mirror of https://github.com/jkjoy/sunpeiwen.git
86 lines
1.9 KiB
JavaScript
86 lines
1.9 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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class Binding {
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constructor({
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identifier,
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scope,
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path,
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kind
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}) {
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this.identifier = void 0;
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this.scope = void 0;
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this.path = void 0;
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this.kind = void 0;
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this.constantViolations = [];
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this.constant = true;
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this.referencePaths = [];
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this.referenced = false;
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this.references = 0;
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this.identifier = identifier;
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this.scope = scope;
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this.path = path;
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this.kind = kind;
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if ((kind === "var" || kind === "hoisted") && isDeclaredInLoop(path || (() => {
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throw new Error("Internal Babel error: unreachable ");
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})())) {
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this.reassign(path);
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}
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this.clearValue();
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}
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deoptValue() {
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this.clearValue();
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this.hasDeoptedValue = true;
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}
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setValue(value) {
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if (this.hasDeoptedValue) return;
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this.hasValue = true;
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this.value = value;
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}
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clearValue() {
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this.hasDeoptedValue = false;
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this.hasValue = false;
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this.value = null;
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}
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reassign(path) {
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this.constant = false;
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if (this.constantViolations.indexOf(path) !== -1) {
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return;
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}
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this.constantViolations.push(path);
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}
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reference(path) {
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if (this.referencePaths.indexOf(path) !== -1) {
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return;
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}
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this.referenced = true;
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this.references++;
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this.referencePaths.push(path);
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}
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dereference() {
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this.references--;
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this.referenced = !!this.references;
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}
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}
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exports.default = Binding;
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function isDeclaredInLoop(path) {
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for (let {
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parentPath,
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key
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} = path; parentPath; ({
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parentPath,
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key
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} = parentPath)) {
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if (parentPath.isFunctionParent()) return false;
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if (parentPath.isWhile() || parentPath.isForXStatement() || parentPath.isForStatement() && key === "body") {
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return true;
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}
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}
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return false;
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}
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//# sourceMappingURL=binding.js.map
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