72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
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"""
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Extract mass from NX measure expression
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This extractor reads mass from a temp file written by solve_simulation.py journal.
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The journal extracts the mass from expression p173 and writes it to _temp_mass.txt
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"""
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from pathlib import Path
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from typing import Dict, Any
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import sys
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def extract_mass_from_expression(prt_file: Path, expression_name: str = "p173") -> float:
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"""
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Extract mass from NX expression by reading temp file.
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The solve_simulation.py journal extracts the p173 expression value
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and writes it to _temp_mass.txt in the model directory.
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Args:
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prt_file: Path to .prt file with mass expression
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expression_name: Name of the expression containing mass (default: "p173")
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Returns:
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Mass in kilograms
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"""
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prt_file = Path(prt_file)
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if not prt_file.exists():
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raise FileNotFoundError(f"Part file not found: {prt_file}")
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# The mass is written to _temp_mass.txt in the same directory as the .prt
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model_dir = prt_file.parent
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mass_file = model_dir / "_temp_mass.txt"
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if not mass_file.exists():
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raise FileNotFoundError(
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f"Mass temp file not found: {mass_file}\n"
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f"The solve_simulation.py journal should have created this file."
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)
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# Read mass from file
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try:
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with open(mass_file, 'r') as f:
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mass_kg = float(f.read().strip())
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print(f"[OK] Mass from {expression_name}: {mass_kg:.6f} kg ({mass_kg * 1000:.2f} g)")
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return mass_kg
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except ValueError as e:
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raise ValueError(f"Could not parse mass from {mass_file}: {e}")
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except Exception as e:
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raise RuntimeError(f"Failed to read mass file: {e}")
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if __name__ == "__main__":
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if len(sys.argv) > 1:
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prt_file = Path(sys.argv[1])
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expression_name = sys.argv[2] if len(sys.argv) > 2 else "p173"
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else:
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print(f"Usage: python {sys.argv[0]} <prt_file> [expression_name]")
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sys.exit(1)
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try:
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mass_kg = extract_mass_from_expression(prt_file, expression_name)
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print(f"\nMass: {mass_kg:.6f} kg ({mass_kg * 1000:.2f} g)")
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except Exception as e:
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print(f"\nERROR: {e}")
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import traceback
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traceback.print_exc()
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sys.exit(1)
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