使用紅寶石的樹梢釘解析debian Packages.gz

我試圖打破一個Packages.gz使用Ruby的樹梢，我有困難使關鍵字和值明確。這裏是我的樹梢語法：使用紅寶石的樹梢釘解析debian Packages.gz

grammar Debian 
    rule collection 
    entry+ 
    end 
    rule entry 
    (tag space value) 
    end 

    rule package_details 
    tag value &[^$] 
    end 
    rule tag 
    [A-Za-z0-9\-]+ ":" 
    end 
    rule value 
    (!tag value_line+ "\n")+ 
    end 
    rule value_line 
    ([A-Za-z0-9 <>@()=\.\-|/,_"':])+ 
    end 
    rule space 
    [ \t]+ 
    end 
end

這是我的樣品輸入：

Package: acct 
Priority: optional 
Section: admin 
Installed-Size: 352 
Maintainer: Ubuntu Developers <[email protected]> 
Original-Maintainer: Mathieu Trudel <[email protected]> 
Architecture: i386 
Version: 6.5.4-2ubuntu1 
Depends: dpkg (>= 1.15.4) | install-info, libc6 (>= 2.4) 
Filename: pool/main/a/acct/acct_6.5.4-2ubuntu1_i386.deb 
Size: 111226 
MD5sum: 10cba1458ace8c31169c0e9e915c9a0f 
SHA1: 6c2dcdc480144a9922329cd4fa22c7d1cb83fcbb 
SHA256: bf8d8bb8eef3939786a1cefc39f94079f43464b71099f4a59b61b24cafdbc010 
Description: The GNU Accounting utilities for process and login accounting 
GNU Accounting Utilities is a set of utilities which reports and summarizes 
data about user connect times and process execution statistics. 
. 
"Login accounting" provides summaries of system resource usage based on connect 
time, and "process accounting" provides summaries based on the commands 
executed on the system. 
. 
The 'last' command is provided by the sysvinit package and not included here. 
Homepage: http://www.gnu.org/software/acct/ 
Bugs: https://bugs.launchpad.net/ubuntu/+filebug 
Origin: Ubuntu 
Supported: 18m

這個工程幾乎是100％，但隨後檢查網址時失敗。問題是一個URL包含一個「：」，我似乎沒有辦法阻止。當我編輯樣本的主頁條目並替換「：」的「_」時，它會直接通過。

這是我的第一個PEG語法，但我可以告訴我需要使它不那麼含糊/更簡潔。看看先進的文檔，我想定義一個標籤爲

rule tag 
    !(!'\n' .) [A-Za-z0-9\-]+ ":" 
end

但我不完全理解它在做什麼。這個標籤一定不能（沒有新的一行或任何東西），我認爲（無論是換行還是沒有）。細微之處讓我想起...

切換到那種格式會幫我嗎？有人知道爲什麼這不匹配？

來源

2010-11-09 xrl

我似乎已經得到了一個工作的語法在這一點上：

grammar Debian 
    # The file is too big for us to emit a package_list. Look at parser.rb to see how I just split the string. 
    #rule package_list 
    # (package "\n"?)+ <DebianSyntaxNode::PackageList> 
    #end 
    rule package 
    (tag/value)+ <DebianSyntaxNode::Package> 
    end 

    rule tag 
    tag_value tag_stop <DebianSyntaxNode::Tag> 
    end 
    rule tag_value 
    [\w\-]+ <DebianSyntaxNode::TagValue> 
    end 
    rule tag_stop 
    ": " <DebianSyntaxNode::TagStop> 
    end 

    rule value 
    value_line value_stop <DebianSyntaxNode::Value> 
    # value_line value_stop <DebianSyntaxNode::Value> 
    end 
    rule value_line 
    (!"\n" .)+ <DebianSyntaxNode::ValueLine> 
    # ([\w \. " , \- ' :/< > @ () = | \[ \] + ; ~ í á * % `])+ <DebianSyntaxNode::ValueLine> 
    end 
    rule value_stop 
    "\n"? <DebianSyntaxNode::ValueStop> 
    end 
end

問題是，現在value_line不包括「\ n」當它是一個多條目。另外，我必須在解析器中合併多行條目。

如果你想看看這段代碼去哪裏，看看我開始的小github項目：https://github.com/derdewey/Debian-Packages-Parser

來源

2010-11-10 19:19:26 xrl

使用紅寶石的樹梢釘解析debian Packages.gz

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