我一直在使用树顶。我写了以下规则
http://thingsaaronmade.com/blog/a-quick-intro-to-writing-a-parser-using-treetop.html
我可以解析我的整个输入字符串,但to_array
除了最初的函数之外,我没有其他函数被触发。
然后我找到了https://whitequark.org/blog/2011/09/08/treetop-typical-errors/,我发现AST squashing
我的规则也在做同样的事情。
我的第一条规则是
rule bodies
blankLine* interesting:(body+) blankLine* <Bodies>
end
一切都被吞噬了body
。
有人可以建议我如何解决这个问题吗?
编辑 添加代码片段:
grammar Sexp
rule bodies
blankLine* interesting:(body+) blankLine* <Bodies>
end
rule body
commentPortString (ifdef_blocks / interface)+ (blankLine / end_of_file) <Body>
end
rule interface
space? (intf / intfWithSize) space? newLine <Interface>
end
rule commentPortString
space? '//' space portString space? <CommentPortString>
end
rule portString
'Port' space? '.' newLine <PortString>
end
rule expression
space? '(' body ')' space? <Expression>
end
rule intf
(input / output) space wire:wireName space? ';' <Intf>
end
rule intfWithSize
(input / output) space? width:ifWidth space? wire:wireName space? ';' <IntfWithSize>
end
rule input
'input' <InputDir>
end
rule output
'output' <OutputDir>
end
rule ifdef_blocks
ifdef_line (interface / ifdef_block)* endif_line <IfdefBlocks>
end
rule ifdef_block
ifdef_line interface* endif_line <IfdefBlocks>
end
rule ifdef_line
space? (ifdef / ifndef) space+ allCaps space? newLine <IfdefLine>
end
rule endif_line
space? (endif) space? newLine <EndifLine>
end
rule ifdef
'`ifdef' <Ifdef>
end
rule ifndef
'`ifndef' <Ifndef>
end
rule endif
'`endif' <Endif>
end
rule ifWidth
'[' space? msb:digits space? ':' space? lsb:digits ']' <IfWidth>
end
rule digits
[0-9]+ <Digits>
end
rule integer
('+' / '-')? [0-9]+ <IntegerLiteral>
end
rule float
('+' / '-')? [0-9]+ (('.' [0-9]+) / ('e' [0-9]+)) <FloatLiteral>
end
rule string
'"' ('\"' / !'"' .)* '"' <StringLiteral>
end
rule identifier
[a-zA-Z\=\*] [a-zA-Z0-9_\=\*]* <Identifier>
end
rule allCaps
[A-Z] [A-Z0-9_]*
end
rule wireName
[a-zA-Z] [a-zA-Z0-9_]* <WireName>
end
rule non_space
!space .
end
rule space
[^\S\n]+
end
rule non_space
!space .
end
rule blankLine
space* newLine
end
rule not_newLine
!newLine .
end
rule newLine
[\n\r]
end
rule end_of_file
!.
end
end
测试字符串
// Port.
input CLK;
// Port.
input REFCLK;
// Port.
input [ 41:0] mem_power_ctrl;
output data;
编辑:添加更多细节
测试代码签入: https ://github.com/justrajdeep/treetop_ruby_issue 。
正如您在我的node_extensions.rb
所有节点中看到的那样,Bodies
除了在方法中引发异常to_array
。但没有任何异常触发。