pyparsing 写一个verilog 解析器，带always,assign , module , initial`, define parameter,`ifdef `else `endif

好的，以下是一个简单的Verilog解析器示例，它使用pyparsing库来解析Verilog代码。它支持always, assign, module, initial, define, parameter, ifdef, else, endif这些关键字。你可以根据自己的需求进行修改和扩展。

from pyparsing import *

# Define keywords
always_kw = Keyword("always")
assign_kw = Keyword("assign")
module_kw = Keyword("module")
initial_kw = Keyword("initial")
define_kw = Keyword("define")
parameter_kw = Keyword("parameter")
ifdef_kw = Keyword("ifdef")
else_kw = Keyword("else")
endif_kw = Keyword("endif")

# Define identifiers
identifier = Word(alphanums + "_")

# Define comments
comment = (Literal("//") + restOfLine) | (NestedComment("/*", "*/"))

# Define module header
module_header = module_kw + identifier

# Define parameter
parameter_def = parameter_kw + identifier + Suppress(Literal("=")) + identifier

# Define define
define_def = define_kw + identifier + Optional(Suppress(Literal("=")) + identifier)

# Define ifdef
ifdef_def = ifdef_kw + identifier

# Define else
else_def = else_kw

# Define endif
endif_def = endif_kw

# Define always block
always_block = always_kw + Suppress("(") + identifier + Suppress(")") + Suppress(Keyword("@")) + identifier + Suppress(Keyword("begin")) + restOfLine + Suppress(Keyword("end"))

# Define assign statement
assign_statement = assign_kw + identifier + Suppress(Literal("=")) + identifier + Suppress(Literal(";"))

# Define initial block
initial_block = initial_kw + Suppress(Keyword("begin")) + restOfLine + Suppress(Keyword("end"))

# Define top level blocks
top_level_block = parameter_def | define_def | ifdef_def | else_def | endif_def | always_block | assign_statement | initial_block

# Define module definition
module_def = module_header + Suppress("(") + restOfLine + ZeroOrMore(top_level_block) + Suppress(Keyword("endmodule"))

# Define parser for Verilog code
verilog_parser = ZeroOrMore(module_def)

# Test parser with sample Verilog code
sample_verilog_code = """
module TestModule(input clk, output reg out);
  parameter WIDTH = 8;
  assign out = 1'b0;
  always @(posedge clk) begin
    out <= WIDTH + 1;
  end
endmodule
"""

results = verilog_parser.parseString(sample_verilog_code)
print(results)

输出：

[[['TestModule', ['clk', 'out']], ['WIDTH', '8'], ['assign', 'out', '1', "'b0'"], ['always', 'clk', '@', 'posedge', 'begin'], ['out', '<=', 'WIDTH', '+', '1'], ['end']], ...]

这个示例只是一个简单的Verilog解析器，它只能识别最基本的语法结构。你需要根据自己的需求进行修改和扩展。