Compiler Error Messages - Improvements Summary

Overview

The FluxSharp compiler now provides clear, helpful error messages to guide developers in fixing their code. All error messages are in English and include specific hints about what went wrong and how to fix it.

Error Detection Categories

1. Syntax Errors

Missing Semicolon Detection

• Error Type: ❌ POSSIBLE SYNTAX ERROR
• Detection: Lines containing assignments, function calls, or array operations that don't end with a semicolon
• Example:

int x = 10    // Missing semicolon

Error Message:

❌ POSSIBLE SYNTAX ERROR at line 3:
  int x = 10
  Hint: Statement appears to be missing a semicolon (;) at the end
  Expected format: int x = 10;

Float Literal Format Error

• Error Type: ⚠️ FLOAT LITERAL ERROR
• Detection: Float literals without the required 'f' or 'F' suffix
• Example:

float f = 3.14;    // Should be 3.14f

Error Message:

⚠️  FLOAT LITERAL ERROR at line 3:
  float f = 3.14;
  Hint: Float literals must end with 'f' or 'F'
  Correct format: 3.14f or 3.14F

Unmatched Parenthesis

• Error Type: ❌ UNMATCHED PARENTHESIS
• Detection: Mismatched opening and closing parentheses
• Example:

int x = max(10, 20;    // Missing closing parenthesis

Error Message:

❌ UNMATCHED PARENTHESIS at line 3:
  int x = max(10, 20;
  Hint: Found 1 opening '(' but only 0 closing ')'

Unmatched Bracket

• Error Type: ❌ UNMATCHED BRACKET
• Detection: Mismatched array brackets
• Example:

int arr[10;    // Missing closing bracket

Error Message:

❌ UNMATCHED BRACKET at line 3:
  int arr[10;
  Hint: Found 1 opening '[' but only 0 closing ']'

2. Type Errors

Undefined Variable

• Error Type: ❌ UNDEFINED VARIABLE
• Details: Variable used before declaration
• Message Format:

❌ Undefined variable: 'variableName'
   Make sure this variable is declared before use with: type variableName = value;

Type Mismatch in Operations

• Error Type: ⚠️ TYPE ERROR
• Details: Invalid arithmetic operations on incompatible types
• Examples:
• Cannot perform arithmetic on strings
• Cannot mix string and numeric types without concatenation
• Invalid operator for specific type

Invalid Float/Double Operations

• Message: Detailed hints about required numeric types and proper syntax

3. Function Errors

Undefined Function

• Error Type: ❌ UNDEFINED FUNCTION
• Message Format:

❌ Undefined function: 'functionName'
   Available math functions: abs, max, min, pow, floor, ceil, round, sqrt

Function Argument Count Mismatch

• Error Type: ❌ FUNCTION ERROR
• Examples:
• max() requires exactly 2 arguments
• sqrt() requires exactly 1 argument
• Function called with wrong number of arguments

Error Message Format:

❌ Function Error: max() requires exactly 2 arguments, but got 1
   Usage: max(value1, value2)

Invalid Function Arguments

• Error Type: ⚠️ WARNING
• Details: Complex expressions not fully supported in certain contexts

4. Math Function Specific Errors

The compiler provides specific error messages for each built-in math function:

• abs(): Requires numeric argument (int, float, or double)
• max()/min(): Both arguments must be the same numeric type
• pow(): Both arguments must be numeric types
• floor()/ceil()/round(): Requires numeric argument
• sqrt(): Requires numeric argument

Example Error:

⚠️  Type Error: max() requires both arguments to be the same numeric type
   Use: max(intA, intB), max(floatA, floatB), or max(doubleA, doubleB)

Color-Coded Error Indicators

All error messages use visual indicators:

• ❌ - Syntax errors that prevent compilation
• ⚠️ - Type errors and warnings that may prevent runtime execution
• 🔴 - Critical compilation failures

Error Prevention Tips

1. Always include semicolons at the end of statements
2. Float literals must end with 'f' or 'F' (e.g., 3.14f)
3. Match parentheses and brackets - each opening character needs a closing one
4. Declare variables before using them
5. Use the correct type for operations - don't mix incompatible types
6. Check function arguments - ensure correct number and type of arguments

Testing the Error Messages

Several test files are included to demonstrate error detection:

• test_missing_semi.fsh - Detects missing semicolons
• test_float_error.fsh - Detects float literal format errors
• test_unmatched_paren.fsh - Detects unmatched parentheses
• test_undefined_var.fsh - Tests handling of undefined variables

Implementation Details

The error detection system is implemented in:

• error_handler.rs: Defines error types and formatting
• main.rs: Contains the detect_common_errors() function for early error detection

All parsing errors are caught and enhanced with line numbers and helpful suggestions.