bc518174
 王天杨
提交两个项目文件
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
class Binding {
constructor({
identifier,
scope,
path,
kind
}) {
this.identifier = void 0;
this.scope = void 0;
this.path = void 0;
this.kind = void 0;
this.constantViolations = [];
this.constant = true;
this.referencePaths = [];
this.referenced = false;
this.references = 0;
this.identifier = identifier;
this.scope = scope;
this.path = path;
this.kind = kind;
if ((kind === "var" || kind === "hoisted") && isInitInLoop(path)) {
this.reassign(path);
}
this.clearValue();
}
deoptValue() {
this.clearValue();
this.hasDeoptedValue = true;
}
setValue(value) {
if (this.hasDeoptedValue) return;
this.hasValue = true;
this.value = value;
}
clearValue() {
this.hasDeoptedValue = false;
this.hasValue = false;
this.value = null;
}
reassign(path) {
this.constant = false;
if (this.constantViolations.includes(path)) {
return;
}
this.constantViolations.push(path);
}
reference(path) {
if (this.referencePaths.includes(path)) {
return;
}
this.referenced = true;
this.references++;
this.referencePaths.push(path);
}
dereference() {
this.references--;
this.referenced = !!this.references;
}
}
exports.default = Binding;
function isInitInLoop(path) {
const isFunctionDeclarationOrHasInit = !path.isVariableDeclarator() || path.node.init;
for (let {
parentPath,
key
} = path; parentPath; {
parentPath,
key
} = parentPath) {
if (parentPath.isFunctionParent()) return false;
if (key === "left" && parentPath.isForXStatement() || isFunctionDeclarationOrHasInit && key === "body" && parentPath.isLoop()) {
return true;
}
}
return false;
}
//# sourceMappingURL=binding.js.map
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