ruby - PBXProject 文件的正则表达式

Question

致力于 XCode 项目文件解析器的纯 ruby​​ 实现，PBXProject ，并且在正则表达式方面几乎不需要帮助。

所以 PBXProject 文件有一堆奇怪的男女混合行，混合了内容。我现在拥有的是正则表达式， (.*?) = (.*?)(\/\* (.*)\*\/)?; ? 适用于更简单的情况(第一行)。但是对于第二行，它切得太早了(到第一个 ; -字符)。

isa = PBXBuildFile; fileRef = C0480C2015F4F91F00E0A2F4 /* zip.c */;

isa = PBXBuildFile; fileRef = C0480C2315F4F91F00E0A2F4 /* ZipArchive.mm */; settings = {COMPILER_FLAGS = "-fno-objc-arc"; };

所以我想从这些行中得到的是简单的 name = value 对，即

isa = PBXBuildFile
settings = {COMPILER_FLAGS = "-fno-objc-arc"; }

用一个正则表达式实现这个的简单方法？

Answer 1

这个正则表达式可以正常工作:

[a-zA-Z0-9]*\s*?=\s*?.*?(?:{[^}]*}|(?=;))

注意只允许有一层括号，正则表达式不会处理嵌套的括号。

从您的示例中，将捕获以下行:

isa = PBXBuildFile
fileRef = C0480C2015F4F91F00E0A2F4 /* zip.c */
isa = PBXBuildFile
fileRef = C0480C2315F4F91F00E0A2F4 /* ZipArchive.mm */
settings = {COMPILER_FLAGS = "-fno-objc-arc"; }

下面是正则表达式的解释:

[a-zA-Z0-9]*\s*?=\s*?.*?(?:{[^}]*}|(?=;))

Options: ^ and $ match at line breaks

Match a single character present in the list below «[a-zA-Z0-9]*»
    Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
    A character in the range between “a” and “z” «a-z»
    A character in the range between “A” and “Z” «A-Z»
    A character in the range between “0” and “9” «0-9»
Match a single character that is a “whitespace character” (spaces, tabs, and line breaks) «\s*?»
    Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
Match the character “=” literally «=»
Match a single character that is a “whitespace character” (spaces, tabs, and line breaks) «\s*?»
    Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
Match any single character that is not a line break character «.*?»
    Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
Match the regular expression below «(?:(?={){[^}]*}|(?=;))»
    Match either the regular expression below (attempting the next alternative only if this one fails) «(?={){[^}]*}»
        Match the character “{” literally «{»
        Match any character that is NOT a “}” «[^}]*»
            Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
        Match the character “}” literally «}»
    Or match regular expression number 2 below (the entire group fails if this one fails to match) «(?=;)»
        Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=;)»
            Match the character “;” literally «;»