diff options
Diffstat (limited to 'node_modules/@babel/traverse/lib/path/introspection.js')
| -rw-r--r-- | node_modules/@babel/traverse/lib/path/introspection.js | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/node_modules/@babel/traverse/lib/path/introspection.js b/node_modules/@babel/traverse/lib/path/introspection.js new file mode 100644 index 0000000..48d6ef1 --- /dev/null +++ b/node_modules/@babel/traverse/lib/path/introspection.js @@ -0,0 +1,436 @@ +"use strict"; + +Object.defineProperty(exports, "__esModule", { + value: true +}); +exports._guessExecutionStatusRelativeTo = _guessExecutionStatusRelativeTo; +exports._guessExecutionStatusRelativeToDifferentFunctions = _guessExecutionStatusRelativeToDifferentFunctions; +exports._resolve = _resolve; +exports.canHaveVariableDeclarationOrExpression = canHaveVariableDeclarationOrExpression; +exports.canSwapBetweenExpressionAndStatement = canSwapBetweenExpressionAndStatement; +exports.equals = equals; +exports.getSource = getSource; +exports.has = has; +exports.is = void 0; +exports.isCompletionRecord = isCompletionRecord; +exports.isConstantExpression = isConstantExpression; +exports.isInStrictMode = isInStrictMode; +exports.isNodeType = isNodeType; +exports.isStatementOrBlock = isStatementOrBlock; +exports.isStatic = isStatic; +exports.isnt = isnt; +exports.matchesPattern = matchesPattern; +exports.referencesImport = referencesImport; +exports.resolve = resolve; +exports.willIMaybeExecuteBefore = willIMaybeExecuteBefore; + +var _t = require("@babel/types"); + +const { + STATEMENT_OR_BLOCK_KEYS, + VISITOR_KEYS, + isBlockStatement, + isExpression, + isIdentifier, + isLiteral, + isStringLiteral, + isType, + matchesPattern: _matchesPattern +} = _t; + +function matchesPattern(pattern, allowPartial) { + return _matchesPattern(this.node, pattern, allowPartial); +} + +function has(key) { + const val = this.node && this.node[key]; + + if (val && Array.isArray(val)) { + return !!val.length; + } else { + return !!val; + } +} + +function isStatic() { + return this.scope.isStatic(this.node); +} + +const is = has; +exports.is = is; + +function isnt(key) { + return !this.has(key); +} + +function equals(key, value) { + return this.node[key] === value; +} + +function isNodeType(type) { + return isType(this.type, type); +} + +function canHaveVariableDeclarationOrExpression() { + return (this.key === "init" || this.key === "left") && this.parentPath.isFor(); +} + +function canSwapBetweenExpressionAndStatement(replacement) { + if (this.key !== "body" || !this.parentPath.isArrowFunctionExpression()) { + return false; + } + + if (this.isExpression()) { + return isBlockStatement(replacement); + } else if (this.isBlockStatement()) { + return isExpression(replacement); + } + + return false; +} + +function isCompletionRecord(allowInsideFunction) { + let path = this; + let first = true; + + do { + const container = path.container; + + if (path.isFunction() && !first) { + return !!allowInsideFunction; + } + + first = false; + + if (Array.isArray(container) && path.key !== container.length - 1) { + return false; + } + } while ((path = path.parentPath) && !path.isProgram()); + + return true; +} + +function isStatementOrBlock() { + if (this.parentPath.isLabeledStatement() || isBlockStatement(this.container)) { + return false; + } else { + return STATEMENT_OR_BLOCK_KEYS.includes(this.key); + } +} + +function referencesImport(moduleSource, importName) { + if (!this.isReferencedIdentifier()) { + if ((this.isMemberExpression() || this.isOptionalMemberExpression()) && (this.node.computed ? isStringLiteral(this.node.property, { + value: importName + }) : this.node.property.name === importName)) { + const object = this.get("object"); + return object.isReferencedIdentifier() && object.referencesImport(moduleSource, "*"); + } + + return false; + } + + const binding = this.scope.getBinding(this.node.name); + if (!binding || binding.kind !== "module") return false; + const path = binding.path; + const parent = path.parentPath; + if (!parent.isImportDeclaration()) return false; + + if (parent.node.source.value === moduleSource) { + if (!importName) return true; + } else { + return false; + } + + if (path.isImportDefaultSpecifier() && importName === "default") { + return true; + } + + if (path.isImportNamespaceSpecifier() && importName === "*") { + return true; + } + + if (path.isImportSpecifier() && isIdentifier(path.node.imported, { + name: importName + })) { + return true; + } + + return false; +} + +function getSource() { + const node = this.node; + + if (node.end) { + const code = this.hub.getCode(); + if (code) return code.slice(node.start, node.end); + } + + return ""; +} + +function willIMaybeExecuteBefore(target) { + return this._guessExecutionStatusRelativeTo(target) !== "after"; +} + +function getOuterFunction(path) { + return (path.scope.getFunctionParent() || path.scope.getProgramParent()).path; +} + +function isExecutionUncertain(type, key) { + switch (type) { + case "LogicalExpression": + return key === "right"; + + case "ConditionalExpression": + case "IfStatement": + return key === "consequent" || key === "alternate"; + + case "WhileStatement": + case "DoWhileStatement": + case "ForInStatement": + case "ForOfStatement": + return key === "body"; + + case "ForStatement": + return key === "body" || key === "update"; + + case "SwitchStatement": + return key === "cases"; + + case "TryStatement": + return key === "handler"; + + case "AssignmentPattern": + return key === "right"; + + case "OptionalMemberExpression": + return key === "property"; + + case "OptionalCallExpression": + return key === "arguments"; + + default: + return false; + } +} + +function isExecutionUncertainInList(paths, maxIndex) { + for (let i = 0; i < maxIndex; i++) { + const path = paths[i]; + + if (isExecutionUncertain(path.parent.type, path.parentKey)) { + return true; + } + } + + return false; +} + +function _guessExecutionStatusRelativeTo(target) { + const funcParent = { + this: getOuterFunction(this), + target: getOuterFunction(target) + }; + + if (funcParent.target.node !== funcParent.this.node) { + return this._guessExecutionStatusRelativeToDifferentFunctions(funcParent.target); + } + + const paths = { + target: target.getAncestry(), + this: this.getAncestry() + }; + if (paths.target.indexOf(this) >= 0) return "after"; + if (paths.this.indexOf(target) >= 0) return "before"; + let commonPath; + const commonIndex = { + target: 0, + this: 0 + }; + + while (!commonPath && commonIndex.this < paths.this.length) { + const path = paths.this[commonIndex.this]; + commonIndex.target = paths.target.indexOf(path); + + if (commonIndex.target >= 0) { + commonPath = path; + } else { + commonIndex.this++; + } + } + + if (!commonPath) { + throw new Error("Internal Babel error - The two compared nodes" + " don't appear to belong to the same program."); + } + + if (isExecutionUncertainInList(paths.this, commonIndex.this - 1) || isExecutionUncertainInList(paths.target, commonIndex.target - 1)) { + return "unknown"; + } + + const divergence = { + this: paths.this[commonIndex.this - 1], + target: paths.target[commonIndex.target - 1] + }; + + if (divergence.target.listKey && divergence.this.listKey && divergence.target.container === divergence.this.container) { + return divergence.target.key > divergence.this.key ? "before" : "after"; + } + + const keys = VISITOR_KEYS[commonPath.type]; + const keyPosition = { + this: keys.indexOf(divergence.this.parentKey), + target: keys.indexOf(divergence.target.parentKey) + }; + return keyPosition.target > keyPosition.this ? "before" : "after"; +} + +const executionOrderCheckedNodes = new WeakSet(); + +function _guessExecutionStatusRelativeToDifferentFunctions(target) { + if (!target.isFunctionDeclaration() || target.parentPath.isExportDeclaration()) { + return "unknown"; + } + + const binding = target.scope.getBinding(target.node.id.name); + if (!binding.references) return "before"; + const referencePaths = binding.referencePaths; + let allStatus; + + for (const path of referencePaths) { + const childOfFunction = !!path.find(path => path.node === target.node); + if (childOfFunction) continue; + + if (path.key !== "callee" || !path.parentPath.isCallExpression()) { + return "unknown"; + } + + if (executionOrderCheckedNodes.has(path.node)) continue; + executionOrderCheckedNodes.add(path.node); + + const status = this._guessExecutionStatusRelativeTo(path); + + executionOrderCheckedNodes.delete(path.node); + + if (allStatus && allStatus !== status) { + return "unknown"; + } else { + allStatus = status; + } + } + + return allStatus; +} + +function resolve(dangerous, resolved) { + return this._resolve(dangerous, resolved) || this; +} + +function _resolve(dangerous, resolved) { + if (resolved && resolved.indexOf(this) >= 0) return; + resolved = resolved || []; + resolved.push(this); + + if (this.isVariableDeclarator()) { + if (this.get("id").isIdentifier()) { + return this.get("init").resolve(dangerous, resolved); + } else {} + } else if (this.isReferencedIdentifier()) { + const binding = this.scope.getBinding(this.node.name); + if (!binding) return; + if (!binding.constant) return; + if (binding.kind === "module") return; + + if (binding.path !== this) { + const ret = binding.path.resolve(dangerous, resolved); + if (this.find(parent => parent.node === ret.node)) return; + return ret; + } + } else if (this.isTypeCastExpression()) { + return this.get("expression").resolve(dangerous, resolved); + } else if (dangerous && this.isMemberExpression()) { + const targetKey = this.toComputedKey(); + if (!isLiteral(targetKey)) return; + const targetName = targetKey.value; + const target = this.get("object").resolve(dangerous, resolved); + + if (target.isObjectExpression()) { + const props = target.get("properties"); + + for (const prop of props) { + if (!prop.isProperty()) continue; + const key = prop.get("key"); + let match = prop.isnt("computed") && key.isIdentifier({ + name: targetName + }); + match = match || key.isLiteral({ + value: targetName + }); + if (match) return prop.get("value").resolve(dangerous, resolved); + } + } else if (target.isArrayExpression() && !isNaN(+targetName)) { + const elems = target.get("elements"); + const elem = elems[targetName]; + if (elem) return elem.resolve(dangerous, resolved); + } + } +} + +function isConstantExpression() { + if (this.isIdentifier()) { + const binding = this.scope.getBinding(this.node.name); + if (!binding) return false; + return binding.constant; + } + + if (this.isLiteral()) { + if (this.isRegExpLiteral()) { + return false; + } + + if (this.isTemplateLiteral()) { + return this.get("expressions").every(expression => expression.isConstantExpression()); + } + + return true; + } + + if (this.isUnaryExpression()) { + if (this.node.operator !== "void") { + return false; + } + + return this.get("argument").isConstantExpression(); + } + + if (this.isBinaryExpression()) { + return this.get("left").isConstantExpression() && this.get("right").isConstantExpression(); + } + + return false; +} + +function isInStrictMode() { + const start = this.isProgram() ? this : this.parentPath; + const strictParent = start.find(path => { + if (path.isProgram({ + sourceType: "module" + })) return true; + if (path.isClass()) return true; + if (!path.isProgram() && !path.isFunction()) return false; + + if (path.isArrowFunctionExpression() && !path.get("body").isBlockStatement()) { + return false; + } + + const body = path.isFunction() ? path.node.body : path.node; + + for (const directive of body.directives) { + if (directive.value.value === "use strict") { + return true; + } + } + }); + return !!strictParent; +}
\ No newline at end of file |