使用Python正则表达式将SystemVerilog打包数组转为解包数组

Here's a practical, straightforward way to transform those packed array declarations into unpacked ones using Python's re module:

Step-by-Step Breakdown #

First, let's map the pattern we're working with:

• Input line structure: <direction> <[range]> <signal_name>;
• Desired output: <direction> <signal_name> <[range]>;

We'll use regex to capture the three key components (direction, range, signal name) and rearrange them into the new format.

Regex Pattern & Replacement #

The regex below targets exactly the structure of your lines, accounting for minor whitespace variations:

pattern = r'^(\w+)\s+\[(\d+:\d+)\]\s+(\w+);$'
replacement = r'\1 \3 [\2];'

• ^(\w+): Grabs the direction (inout/input/output) at the start of the line.
• \s+\[(\d+:\d+)\]\s+: Captures the numeric range inside brackets, ignoring any surrounding spaces.
• (\w+);$: Captures the signal name just before the closing semicolon.
• The replacement string swaps the position of the signal name and range.

Full Python Code Example #

import re

# Load your input content (replace with file reading for real use)
input_text = """inout [5:0] IO_PMU_LED;
input [7:0] PMU_DI_SCAN_IN_VCORE;
inout [31:0] PMU_DI_RIF_WR_DATA_VLP ;
output [9:0] PMU_DI_RIF_ADDR_VLP;
input [5:0] PMU_DI_LED_PAD_DRIVE_VALUE_VLP;
output [5:0] PMU_DI_LED_PAD_DRIVE_ENABLE_VLP;"""

# Process each line
processed_lines = []
for line in input_text.splitlines():
    # Clean up trailing whitespace first (handles the extra space in line 3)
    cleaned_line = line.rstrip()
    # Apply regex replacement if the line matches our pattern
    modified_line = re.sub(pattern, replacement, cleaned_line)
    processed_lines.append(modified_line)

# Combine lines back into a single string
output_text = '\n'.join(processed_lines)

# Print result or write to file
print(output_text)

Result #

Running this code will produce exactly the output you want:

inout IO_PMU_LED [5:0];
input PMU_DI_SCAN_IN_VCORE [7:0];
inout PMU_DI_RIF_WR_DATA_VLP [31:0];
output PMU_DI_RIF_ADDR_VLP [9:0];
input PMU_DI_LED_PAD_DRIVE_VALUE_VLP [5:0];
output PMU_DI_LED_PAD_DRIVE_ENABLE_VLP [5:0];

Bonus: File I/O #

To use this on a real file instead of sample text, replace the input/output sections with:

# Read from input file
with open('your_input_file.sv', 'r') as f:
    input_text = f.read()

# Write to output file
with open('your_output_file.sv', 'w') as f:
    f.write(output_text)

内容的提问来源于stack exchange，提问作者sanforyou