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* TypeScript Parser
*
* This module provides functionality to traverse a Tree-sitter AST
* for TypeScript/TSX and extract code entities and relationships.
*/
/**
* Extract code entities and relationships from a TypeScript/TSX AST
* @param {Object} astRootNode - The root node of the Tree-sitter AST
* @param {String} fileContentString - The full content of the file
* @returns {Object} Object containing arrays of extracted entities and relationships
*/
export function parseTypeScript(astRootNode, fileContentString) {
// Initialize empty arrays to store the entities and relationships
const entities = [];
const relationships = [];
// Track current parent entity for establishing hierarchical relationships
let currentParentEntity = null;
/**
* Helper function to create a code entity object
* @param {Object} node - The Tree-sitter AST node
* @param {string} entityType - The type of entity
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createCodeEntity(node, entityType, parentEntity = null) {
if (!node) return null;
// Extract the raw content from the file using node positions
const startByte = node.startIndex;
const endByte = node.endIndex;
const rawContent = fileContentString.substring(startByte, endByte);
// Extract position information
const startLine = node.startPosition.row + 1; // Tree-sitter uses 0-based line numbers
const startColumn = node.startPosition.column;
const endLine = node.endPosition.row + 1;
const endColumn = node.endPosition.column;
// Create entity with a temporary ID that will be replaced by the database
// This ID is just for establishing relationships within the same file
const entity = {
id: `temp_${entities.length + 1}`,
entity_type: entityType,
name: "", // Will be set by the specific entity creation function
start_line: startLine,
start_column: startColumn,
end_line: endLine,
end_column: endColumn,
raw_content: rawContent,
language: "typescript",
parent_entity_id: parentEntity ? parentEntity.id : null,
custom_metadata: {},
};
// Add the entity to our array
entities.push(entity);
// If this entity has a parent, create a parent-child relationship
if (parentEntity) {
createRelationship(
parentEntity.id,
entity.id,
entity.id, // Use the entity ID as target_symbol_name since we don't have the name yet
"DEFINES_CHILD_ENTITY"
);
}
return entity;
}
/**
* Helper function to create a relationship object
* @param {string} sourceEntityId - The ID of the source entity
* @param {string|null} targetEntityId - The ID of the target entity (if known)
* @param {string} targetSymbolName - The name of the target symbol
* @param {string} relationshipType - The type of relationship
* @param {Object} customMetadata - Additional metadata for the relationship
* @private
*/
function createRelationship(
sourceEntityId,
targetEntityId,
targetSymbolName,
relationshipType,
customMetadata = {}
) {
if (!sourceEntityId || !targetSymbolName) return null;
const relationship = {
source_entity_id: sourceEntityId,
target_entity_id: targetEntityId,
target_symbol_name: targetSymbolName,
relationship_type: relationshipType,
custom_metadata: customMetadata,
};
relationships.push(relationship);
return relationship;
}
/**
* Create an interface entity from an interface_declaration node
* @param {Object} node - The Tree-sitter AST node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createInterfaceEntity(node, parentEntity = null) {
if (!node) return null;
// Find the identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "identifier") {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(
node,
"interface_declaration",
parentEntity
);
if (!entity) return null;
entity.name = name;
// Check for extends clause
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "extends_clause") {
entity.custom_metadata.hasExtendsClause = true;
break;
}
}
return entity;
}
/**
* Create a type alias entity from a type_alias_declaration node
* @param {Object} node - The Tree-sitter AST node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createTypeAliasEntity(node, parentEntity = null) {
if (!node) return null;
// Find the identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "identifier") {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(
node,
"type_alias_declaration",
parentEntity
);
if (!entity) return null;
entity.name = name;
// Get the type of alias (union, intersection, object, etc)
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type !== "identifier" && child.type !== "=") {
entity.custom_metadata.valueType = child.type;
break;
}
}
return entity;
}
/**
* Create an enum entity from an enum_declaration node
* @param {Object} node - The Tree-sitter AST node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createEnumEntity(node, parentEntity = null) {
if (!node) return null;
// Find the identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "identifier") {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(node, "enum_declaration", parentEntity);
if (!entity) return null;
entity.name = name;
return entity;
}
/**
* Create an enum member entity from an enum_member node
* @param {Object} node - The Tree-sitter AST node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createEnumMemberEntity(node, parentEntity = null) {
if (!node) return null;
// Find the property identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "property_identifier") {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(node, "enum_member", parentEntity);
if (!entity) return null;
entity.name = name;
// Check for value assignment
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type !== "property_identifier" && child.type !== "=") {
entity.custom_metadata.hasValue = true;
break;
}
}
return entity;
}
/**
* Create a namespace entity from a namespace_declaration or module_declaration node
* @param {Object} node - The Tree-sitter AST node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createNamespaceEntity(node, parentEntity = null) {
if (!node) return null;
// Find the identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "identifier" || child.type === "nested_identifier") {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(
node,
"namespace_declaration",
parentEntity
);
if (!entity) return null;
entity.name = name;
return entity;
}
/**
* Create a class entity from a class_declaration or abstract_class_declaration node
* @param {Object} node - The Tree-sitter AST node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createClassEntity(node, parentEntity = null) {
if (!node) return null;
// Find the identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "identifier") {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(node, "class_declaration", parentEntity);
if (!entity) return null;
entity.name = name;
// Check if the class is abstract
if (node.type === "abstract_class_declaration") {
entity.custom_metadata.isAbstract = true;
}
// Check for extends clause
let hasExtends = false;
let hasImplements = false;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "extends_clause") {
hasExtends = true;
} else if (child.type === "implements_clause") {
hasImplements = true;
}
}
if (hasExtends) {
entity.custom_metadata.hasExtendsClause = true;
}
if (hasImplements) {
entity.custom_metadata.hasImplementsClause = true;
}
return entity;
}
/**
* Create a function entity from a function declaration node
* @param {Object} node - The function declaration node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createFunctionEntity(node, parentEntity = null) {
if (!node) return null;
// Find the name of the function
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "identifier") {
nameNode = child;
break;
}
}
// Some functions might be anonymous
let name = nameNode ? nameNode.text : "anonymous";
const entity = createCodeEntity(node, "function_declaration", parentEntity);
if (!entity) return null;
entity.name = name;
// Check if the function is async
for (let i = 0; i < node.childCount; i++) {
const child = node.child(i);
if (child.type === "async") {
entity.custom_metadata.isAsync = true;
break;
}
}
// Check for function return type
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "type_annotation") {
entity.custom_metadata.hasReturnType = true;
break;
}
}
return entity;
}
/**
* Create a method entity from a method definition node
* @param {Object} node - The method definition node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createMethodEntity(node, parentEntity = null) {
if (!node) return null;
// Find the property identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "property_identifier") {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(node, "method_definition", parentEntity);
if (!entity) return null;
entity.name = name;
// Check for method modifiers
for (let i = 0; i < node.childCount; i++) {
const child = node.child(i);
if (child.type === "static") {
entity.custom_metadata.isStatic = true;
} else if (child.type === "async") {
entity.custom_metadata.isAsync = true;
} else if (child.type === "get") {
entity.custom_metadata.isGetter = true;
} else if (child.type === "set") {
entity.custom_metadata.isSetter = true;
}
}
// Check for method return type
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "type_annotation") {
entity.custom_metadata.hasReturnType = true;
break;
}
}
return entity;
}
/**
* Create a property entity from a property definition node
* @param {Object} node - The property definition node
* @param {Object|null} parentEntity - The parent entity (if any)
* @returns {Object|null} The created entity object or null if creation failed
* @private
*/
function createPropertyEntity(node, parentEntity = null) {
if (!node) return null;
// Find the property identifier (name) node
let nameNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (
child.type === "property_identifier" ||
child.type === "private_property_identifier"
) {
nameNode = child;
break;
}
}
if (!nameNode) return null;
const name = nameNode.text;
const entity = createCodeEntity(node, "property_definition", parentEntity);
if (!entity) return null;
entity.name = name;
// Check for property modifiers
for (let i = 0; i < node.childCount; i++) {
const child = node.child(i);
if (child.type === "readonly") {
entity.custom_metadata.isReadonly = true;
} else if (child.type === "private") {
entity.custom_metadata.isPrivate = true;
} else if (child.type === "protected") {
entity.custom_metadata.isProtected = true;
} else if (child.type === "public") {
entity.custom_metadata.isPublic = true;
} else if (child.type === "?") {
entity.custom_metadata.isOptional = true;
}
}
// Check for property type
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "type_annotation") {
entity.custom_metadata.hasType = true;
break;
}
}
return entity;
}
/**
* Extract interface extension relationships from an interface declaration
* @param {Object} node - The interface_declaration node
* @param {Object} interfaceEntity - The interface entity object
* @private
*/
function extractInterfaceExtension(node, interfaceEntity) {
if (!node || !interfaceEntity) return;
// Find extends clause
let extendsClause = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "extends_clause") {
extendsClause = child;
break;
}
}
if (!extendsClause) return;
// Find all extended interfaces
for (let i = 0; i < extendsClause.namedChildCount; i++) {
const child = extendsClause.namedChild(i);
if (child.type === "type_reference" || child.type === "identifier") {
const extendedName = child.text;
createRelationship(
interfaceEntity.id,
null, // No target ID as it might be in another file
extendedName,
"EXTENDS_INTERFACE"
);
}
}
}
/**
* Extract implements relationships from a class declaration
* @param {Object} node - The class_declaration node
* @param {Object} classEntity - The class entity object
* @private
*/
function extractImplementsInterface(node, classEntity) {
if (!node || !classEntity) return;
// Find implements clause
let implementsClause = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "implements_clause") {
implementsClause = child;
break;
}
}
if (!implementsClause) return;
// Find all implemented interfaces
for (let i = 0; i < implementsClause.namedChildCount; i++) {
const child = implementsClause.namedChild(i);
if (child.type === "type_reference" || child.type === "identifier") {
const implementedName = child.text;
createRelationship(
classEntity.id,
null, // No target ID as it might be in another file
implementedName,
"IMPLEMENTS_INTERFACE"
);
}
}
}
/**
* Extract type references from various TypeScript type annotation nodes
* @param {Object} node - The node containing type references
* @param {Object} parentEntity - The entity containing the type reference
* @private
*/
function extractTypeReference(node, parentEntity) {
if (!node || !parentEntity) return;
const nodeType = node.type;
// For type annotations, extract the referenced type
if (nodeType === "type_annotation") {
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (
child.type === "type_reference" ||
child.type === "predefined_type" ||
child.type === "identifier"
) {
createRelationship(
parentEntity.id,
null,
child.text,
"TYPE_REFERENCE"
);
} else if (child.type === "generic_type") {
// Handle generic types (like Array<string>)
for (let j = 0; j < child.namedChildCount; j++) {
const grandchild = child.namedChild(j);
if (grandchild.type === "identifier") {
createRelationship(
parentEntity.id,
null,
grandchild.text,
"TYPE_REFERENCE",
{ isGeneric: true }
);
} else if (grandchild.type === "type_arguments") {
// Process type arguments
for (let k = 0; k < grandchild.namedChildCount; k++) {
const typeArg = grandchild.namedChild(k);
if (
typeArg.type === "identifier" ||
typeArg.type === "predefined_type"
) {
createRelationship(
parentEntity.id,
null,
typeArg.text,
"TYPE_REFERENCE",
{ isTypeArgument: true }
);
}
}
}
}
} else if (child.type === "union_type") {
// Handle union types (like string | number)
for (let j = 0; j < child.namedChildCount; j++) {
const unionMember = child.namedChild(j);
if (
unionMember.type === "identifier" ||
unionMember.type === "predefined_type"
) {
createRelationship(
parentEntity.id,
null,
unionMember.text,
"TYPE_REFERENCE",
{ isUnionMember: true }
);
}
}
}
}
}
// For type parameters, extract the constraint types
else if (nodeType === "type_parameter") {
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "constraint") {
for (let j = 0; j < child.namedChildCount; j++) {
const constraint = child.namedChild(j);
if (
constraint.type === "identifier" ||
constraint.type === "type_reference"
) {
createRelationship(
parentEntity.id,
null,
constraint.text,
"TYPE_REFERENCE",
{ isConstraint: true }
);
}
}
}
}
}
}
/**
* Extract a function call relationship from a call expression node
* @param {Object} node - The call expression node
* @param {Object|null} parentEntity - The parent entity making the call
* @private
*/
function extractFunctionCall(node, parentEntity = null) {
if (!node || !parentEntity) return;
// Find the function node (first child)
let functionNode = null;
if (node.namedChildCount > 0) {
functionNode = node.namedChild(0);
}
if (!functionNode) return;
let functionName = "";
// Handle direct function calls vs method calls
if (functionNode.type === "identifier") {
functionName = functionNode.text;
} else if (functionNode.type === "member_expression") {
// For member expressions, get the property name
for (let i = 0; i < functionNode.namedChildCount; i++) {
const child = functionNode.namedChild(i);
if (child.type === "property_identifier") {
functionName = child.text;
break;
}
}
}
if (functionName) {
createRelationship(
parentEntity.id,
null, // No target ID as the function might be in another file
functionName,
"CALLS_FUNCTION"
);
}
}
/**
* Extract a variable reference from a member expression node
* @param {Object} node - The member expression node
* @param {Object|null} parentEntity - The parent entity referencing the variable
* @private
*/
function extractMemberAccess(node, parentEntity = null) {
if (!node || !parentEntity) return;
// Find object (first child) and property (second child)
let objectNode = null;
let propertyNode = null;
if (node.namedChildCount >= 2) {
objectNode = node.namedChild(0);
propertyNode = node.namedChild(1);
}
if (objectNode && propertyNode) {
// For simplicity, we only track top-level variables, not complex chains
if (objectNode.type === "identifier") {
const objectName = objectNode.text;
// Create a relationship for the variable reference
createRelationship(
parentEntity.id,
null, // No target ID as the variable might be in another file
objectName,
"REFERENCES_VARIABLE"
);
}
}
}
/**
* Extract a variable assignment relationship
* @param {Object} node - The variable declarator node
* @param {Object|null} parentEntity - The parent entity containing the assignment
* @private
*/
function extractVariableAssignment(node, parentEntity = null) {
if (!node || !parentEntity) return;
// Find value node (usually the third child after name and =)
let valueNode = null;
if (node.namedChildCount >= 3) {
valueNode = node.namedChild(2);
} else if (node.namedChildCount >= 2) {
// For simple assignments with no type annotation
valueNode = node.namedChild(1);
}
if (valueNode) {
if (valueNode.type === "call_expression") {
extractFunctionCall(valueNode, parentEntity);
} else if (valueNode.type === "member_expression") {
extractMemberAccess(valueNode, parentEntity);
}
}
}
/**
* Extract import relationships from an import statement
* @param {Object} node - The import statement node
* @private
*/
function extractImportRelationship(node) {
if (!node) return;
// Find the source module (usually the last child)
let sourceNode = null;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "string") {
sourceNode = child;
break;
}
}
if (!sourceNode) return;
const sourcePath = sourceNode.text.replace(/['"]/g, ""); // Remove quotes
// Create a simple import relationship for now
for (let i = 0; i < entities.length; i++) {
// Create one relationship for each top-level entity in the file
if (!entities[i].parent_entity_id) {
createRelationship(
entities[i].id,
null, // No target ID as we don't know what file this is
sourcePath,
"IMPORTS_MODULE",
{ isExternal: sourcePath.startsWith(".") ? false : true }
);
}
}
}
/**
* Extract export relationships from an export statement
* @param {Object} node - The export statement node
* @private
*/
function extractExportRelationship(node) {
if (!node) return;
// TODO: Implement export relationship extraction
// This would involve identifying what is being exported
// and creating relationships accordingly
}
/**
* Recursively visit AST nodes to extract code entities and relationships
* @param {Object} node - The current tree-sitter AST node
* @param {Object|null} parentEntity - The parent entity (if any)
* @private
*/
function visitNode(node, parentEntity = null) {
if (!node) return;
let createdEntity = null;
const nodeType = node.type;
// Extract entities based on node type
switch (nodeType) {
// Common JavaScript/TypeScript entities
case "function_declaration":
case "function":
case "generator_function":
case "generator_function_declaration":
case "arrow_function":
createdEntity = createFunctionEntity(node, parentEntity);
break;
case "class_declaration":
case "abstract_class_declaration": // TypeScript-specific
createdEntity = createClassEntity(node, parentEntity);
break;
case "method_definition":
createdEntity = createMethodEntity(node, parentEntity);
break;
case "property_definition":
createdEntity = createPropertyEntity(node, parentEntity);
break;
// TypeScript-specific entities
case "interface_declaration":
createdEntity = createInterfaceEntity(node, parentEntity);
break;
case "type_alias_declaration":
createdEntity = createTypeAliasEntity(node, parentEntity);
break;
case "enum_declaration":
createdEntity = createEnumEntity(node, parentEntity);
break;
case "enum_member":
createdEntity = createEnumMemberEntity(node, parentEntity);
break;
case "namespace_declaration":
case "module_declaration": // TypeScript namespace or module
createdEntity = createNamespaceEntity(node, parentEntity);
break;
// Extract relationships
case "call_expression":
extractFunctionCall(node, parentEntity);
break;
case "member_expression":
extractMemberAccess(node, parentEntity);
break;
case "variable_declarator":
if (node.childCount >= 2 && node.child(1).type === "=") {
extractVariableAssignment(node, parentEntity);
}
break;
case "import_statement":
extractImportRelationship(node);
break;
case "export_statement":
extractExportRelationship(node);
break;
}
// Handle TypeScript-specific relationships
if (nodeType === "interface_declaration") {
// Check if this interface has an extends clause
let hasExtendsClause = false;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "extends_clause") {
hasExtendsClause = true;
break;
}
}
if (hasExtendsClause && createdEntity) {
extractInterfaceExtension(node, createdEntity);
}
}
if (
nodeType === "class_declaration" ||
nodeType === "abstract_class_declaration"
) {
// Check if this class has an implements clause
let hasImplementsClause = false;
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
if (child.type === "implements_clause") {
hasImplementsClause = true;
break;
}
}
if (hasImplementsClause && createdEntity) {
extractImplementsInterface(node, createdEntity);
}
}
// Extract type references in various TypeScript-specific contexts
if (
[
"type_annotation",
"type_parameter",
"type_arguments",
"extends_clause",
].includes(nodeType)
) {
extractTypeReference(node, createdEntity || parentEntity);
}
// Continue traversing child nodes
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
visitNode(child, createdEntity || parentEntity);
}
}
// Start traversing the AST from the root node
visitNode(astRootNode, null);
// Update relationship target_symbol_name with actual entity names for internal references
for (let relationship of relationships) {
if (relationship.target_entity_id) {
const targetEntity = entities.find(
(entity) => entity.id === relationship.target_entity_id
);
if (targetEntity) {
relationship.target_symbol_name = targetEntity.name;
}
}
}
return { entities, relationships };
}
/**
* Convert a Tree-sitter node to a serializable object
* @param {Object} node - The Tree-sitter AST node
* @returns {Object} A serializable object representing the node
*/
export function nodeToObject(node) {
if (!node) return null;
const result = {
type: node.type,
text: node.text,
startPosition: node.startPosition,
endPosition: node.endPosition,
startIndex: node.startIndex,
endIndex: node.endIndex,
children: [],
};
// Add named children
for (let i = 0; i < node.namedChildCount; i++) {
const child = node.namedChild(i);
result.children.push(nodeToObject(child));
}
return result;
}
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