Issue #64.2: Mathematical Expression Evaluator #66

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tegwick · 2025-10-02T08:25:47Z

tegwick commented

2025-10-02 08:25:47 +00:00

Implement calculation engine for business logic and mathematical operations

Epic: #64 Template & Calculation Engine
Priority: Critical | Effort: Large | Dependencies: #65 (Template Engine Foundation)

Description

Implement calculation engine for business logic and mathematical operations to enable automated calculations in business documents.

Acceptance Criteria

Evaluate expressions: {{add field1 field2}}, {{multiply quantity price}}
Support mathematical functions: add, subtract, multiply, divide, sum, avg
Handle currency formatting and decimal precision
Array operations: sum, count, filter, map
Date/time calculations and formatting
Error handling for invalid calculations

Technical Requirements

Expression parser with mathematical operation support
Type system for numbers, currencies, dates
Formatter system for output presentation
Integration with template variable substitution

Example Usage

Total: {{multiply quantity unit_price}} EUR
Tax: {{multiply total 0.19}} EUR
Grand Total: {{add total tax}} EUR

Implement calculation engine for business logic and mathematical operations **Epic**: #64 Template & Calculation Engine **Priority**: Critical | **Effort**: Large | **Dependencies**: #65 (Template Engine Foundation) ## Description Implement calculation engine for business logic and mathematical operations to enable automated calculations in business documents. ## Acceptance Criteria - [ ] Evaluate expressions: `{{add field1 field2}}`, `{{multiply quantity price}}` - [ ] Support mathematical functions: add, subtract, multiply, divide, sum, avg - [ ] Handle currency formatting and decimal precision - [ ] Array operations: sum, count, filter, map - [ ] Date/time calculations and formatting - [ ] Error handling for invalid calculations ## Technical Requirements - Expression parser with mathematical operation support - Type system for numbers, currencies, dates - Formatter system for output presentation - Integration with template variable substitution ## Example Usage ```markdown Total: {{multiply quantity unit_price}} EUR Tax: {{multiply total 0.19}} EUR Grand Total: {{add total tax}} EUR ```

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Issue #64.5: Template Validation & Quality Assurance #69

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Issue #64.6: Business Document Templates Library #70

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2025-10-02 08:40:05 +00:00

Epic #66: External Systems & Professional Export - Enterprise Integration #73