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* EnumTypeResolver - Handles enum type inference from expressions
*
* Extracted from CodeGenerator to reduce complexity.
* Uses CodeGenState for all state access.
*
* ADR-017: Extract enum type from expressions for type-safe comparisons.
* Handles patterns:
* - Variable of enum type: `currentState` -> 'State'
* - Enum member access: `State.IDLE` -> 'State'
* - Scoped enum member: `Motor.State.IDLE` -> 'Motor_State'
* - ADR-016: this.State.IDLE -> 'CurrentScope_State'
* - ADR-016: this.variable -> enum type if variable is of enum type
* - Function calls returning enum types
*/
import * as Parser from "../../../logic/parser/grammar/CNextParser";
import CodeGenState from "../CodeGenState";
/**
* Resolves enum types from expressions.
* All methods are static - uses CodeGenState for state access.
*/
export default class EnumTypeResolver {
/**
* Extract enum type from an expression.
* Returns the enum type name if the expression is an enum value, null otherwise.
*/
static resolve(
ctx: Parser.ExpressionContext | Parser.RelationalExpressionContext,
): string | null {
const text = ctx.getText();
// Check if it's a function call returning an enum
const enumReturnType = this.getFunctionCallEnumType(text);
if (enumReturnType) {
return enumReturnType;
}
// Check if it's a simple identifier that's an enum variable
if (/^[a-zA-Z_]\w*$/.exec(text)) {
const typeInfo = CodeGenState.typeRegistry.get(text);
if (typeInfo?.isEnum && typeInfo.enumTypeName) {
return typeInfo.enumTypeName;
}
}
// Check member access patterns: EnumType.MEMBER, Scope.EnumType.MEMBER, etc.
return this.getEnumTypeFromMemberAccess(text.split("."));
}
/**
* Check if parts represent an enum member access and return the enum type.
*/
private static getEnumTypeFromMemberAccess(parts: string[]): string | null {
if (parts.length < 2) {
return null;
}
// ADR-016: Check this.State.IDLE pattern
const thisEnumType = this.getEnumTypeFromThisEnum(parts);
if (thisEnumType) return thisEnumType;
// Issue #478: Check global.Enum.Member pattern
const globalEnumType = this.getEnumTypeFromGlobalEnum(parts);
if (globalEnumType) return globalEnumType;
// ADR-016: Check this.variable pattern
const thisVarType = this.getEnumTypeFromThisVariable(parts);
if (thisVarType) return thisVarType;
// Check simple enum: State.IDLE
const possibleEnum = parts[0];
if (CodeGenState.isKnownEnum(possibleEnum)) {
return possibleEnum;
}
// Check scoped enum: Motor.State.IDLE -> Motor_State
return this.getEnumTypeFromScopedEnum(parts);
}
/**
* ADR-016: Check this.State.IDLE pattern (this.Enum.Member inside scope)
*/
private static getEnumTypeFromThisEnum(parts: string[]): string | null {
if (parts[0] !== "this" || !CodeGenState.currentScope || parts.length < 3) {
return null;
}
const enumName = parts[1];
const scopedEnumName = `${CodeGenState.currentScope}_${enumName}`;
return CodeGenState.isKnownEnum(scopedEnumName) ? scopedEnumName : null;
}
/**
* Issue #478: Check global.Enum.Member pattern (global.ECategory.CAT_A)
*/
private static getEnumTypeFromGlobalEnum(parts: string[]): string | null {
if (parts[0] !== "global" || parts.length < 3) {
return null;
}
const enumName = parts[1];
return CodeGenState.isKnownEnum(enumName) ? enumName : null;
}
/**
* ADR-016: Check this.variable pattern (this.varName where varName is enum type)
*/
private static getEnumTypeFromThisVariable(parts: string[]): string | null {
if (
parts[0] !== "this" ||
!CodeGenState.currentScope ||
parts.length !== 2
) {
return null;
}
const varName = parts[1];
const scopedVarName = `${CodeGenState.currentScope}_${varName}`;
const typeInfo = CodeGenState.typeRegistry.get(scopedVarName);
if (typeInfo?.isEnum && typeInfo.enumTypeName) {
return typeInfo.enumTypeName;
}
return null;
}
/**
* Check scoped enum: Motor.State.IDLE -> Motor_State
*/
private static getEnumTypeFromScopedEnum(parts: string[]): string | null {
if (parts.length < 3) {
return null;
}
const scopeName = parts[0];
const enumName = parts[1];
const scopedEnumName = `${scopeName}_${enumName}`;
return CodeGenState.isKnownEnum(scopedEnumName) ? scopedEnumName : null;
}
/**
* Check if an expression is a function call returning an enum type.
* Handles patterns:
* - func() or func(args) - global function
* - Scope.method() or Scope.method(args) - scope method from outside
* - this.method() or this.method(args) - scope method from inside
* - global.func() or global.func(args) - global function from inside scope
* - global.Scope.method() or global.Scope.method(args) - scope method from inside another scope
*/
private static getFunctionCallEnumType(text: string): string | null {
// Check if this looks like a function call (contains parentheses)
const parenIndex = text.indexOf("(");
if (parenIndex === -1) {
return null;
}
// Extract the function reference (everything before the opening paren)
const funcRef = text.substring(0, parenIndex);
const parts = funcRef.split(".");
let fullFuncName: string | null = null;
if (parts.length === 1) {
// Simple function call: func()
fullFuncName = parts[0];
} else if (parts.length === 2) {
if (parts[0] === "this" && CodeGenState.currentScope) {
// this.method() -> Scope_method
fullFuncName = `${CodeGenState.currentScope}_${parts[1]}`;
} else if (parts[0] === "global") {
// global.func() -> func
fullFuncName = parts[1];
E} else if (CodeGenState.isKnownScope(parts[0])) {
// Scope.method() -> Scope_method
fullFuncName = `${parts[0]}_${parts[1]}`;
}
E} else if (parts.length === 3) {
Eif (parts[0] === "global" && CodeGenState.isKnownScope(parts[1])) {
// global.Scope.method() -> Scope_method
fullFuncName = `${parts[1]}_${parts[2]}`;
}
}
Iif (!fullFuncName) {
return null;
}
// Look up the function's return type
const returnType = CodeGenState.getFunctionReturnType(fullFuncName);
if (!returnType) {
return null;
}
// Check if the return type is an enum
if (CodeGenState.isKnownEnum(returnType)) {
return returnType;
}
return null;
}
}
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