为什么使用 dblQuotedString 会更改匹配位置?

Why does using dblQuotedString change the match location?

我有以下 python 程序:

from pyparsing import *

#grammar START
string_list_item = dblQuotedString | Word(printables.replace(')', ''))
cmake_list_content = OneOrMore(string_list_item)

variable_name = Word(alphas+"_", alphanums+"_")

set_keyword = CaselessLiteral("set")

set_normal_variable_stmt = set_keyword + "(" \
    + variable_name \
        + cmake_list_content + ")" 
#grammar END

cmake_source = "set(TabsPls_Sources Main.cpp)"

string_list_item.setDebug()

set_normal_variable_stmt.parseString(cmake_source)

这为 'Main.cpp' 提供以下输出:

Match {string enclosed in double quotes | W:(0123...)} at loc 19(1,20)
Matched {string enclosed in double quotes | W:(0123...)} -> ['Main.cpp']

但是当我从第一行删除 dblQuotedString 时:

Match W:(0123...) at loc 20(1,21)
Matched W:(0123...) -> ['Main.cpp']

为什么会这样?输入中没有任何双引号字符串,为什么匹配位置会发生变化?

我自己关闭这个问题,因为这是由于 bug #244,现已修复!