文件 FILE1 有数千行,其终止模式为 _Pattern1。
第二个文件也有数千行具有相同的终止模式_Pattern1。
我现在必须:
逐行读取 FILE1
找出该行是否有任何以 _Pattern1 结尾的字符串
提取字符串并将其存储到变量中
打开 FILE2 并逐行读取
找出刚刚从 FILE2 读取的行是否包含存储在上述变量中的字符串
这是如何在 perl 中完成的?
编辑2:
好吧,通过谷歌搜索并参考下面列出的链接,我解决了我的问题。这是代码片段。
#!/usr/bin/perl
use strict;
use warnings;
my $OriginalHeader=$ARGV[0]; ## Source file
my $GeneratedHeader=$ARGV[1];## File to compare against
my $DeltaHeader=$ARGV[2]; ## File to store misses
my $MatchingPattern="_Pos";
my $FoundPattern;
open FILE1, $OriginalHeader or die $!;
open FILE2, $GeneratedHeader or die $!;
open (FILE3, ">$DeltaHeader") or die $!;
my $lineFromOriginalHeader;
my $lineFromGeneratedHeader;
my $TotalMacrosExamined = 0;
my $TotalMacrosMissed = 0;
while($lineFromOriginalHeader=<FILE1>)
{
if($lineFromOriginalHeader =~ /$MatchingPattern/)
{
my $index = index($lineFromOriginalHeader,$MatchingPattern);
my $BackIndex = $index;
my $BackIndexStart = $index;
$BackIndex = $BackIndex - 1;
## Use this while loop to extract the substring.
while (1)
{
my $ExtractedChar = substr($lineFromOriginalHeader,$BackIndex,1);
if ($ExtractedChar =~ / /)
{
$FoundPattern = substr($lineFromOriginalHeader,$BackIndex + 1,$BackIndexStart + 3 -
$BackIndex);
print "Identified $FoundPattern \n";
$TotalMacrosExamined = $TotalMacrosExamined + 1;
##Skip the next line
$lineFromOriginalHeader = <FILE1>;
last;
}
else
{
$BackIndex = $BackIndex - 1;
}
} ##while(1)
## We now look for $FoundPattern in FILE2
while ($lineFromGeneratedHeader = <FILE2>)
{
if (index($lineFromGeneratedHeader,$FoundPattern)!= -1)
{
##Pattern found. Reset file pointer and break out of while loop
seek FILE2,0,0;
last;
}
else
{
if (eof(FILE2) == 1)
{
print FILE3 "Generated header misses $FoundPattern\n";
$TotalMacrosMissed = $TotalMacrosMissed + 1;
seek FILE2,0,0;
last;
}
}
} ##while(1)
}
else
{
##NOP
}
} ##while (linefromoriginalheader)
close FILE1;
close FILE2;
close FILE3;
print "Total number of bitfields examined = $TotalMacrosExamined\n";
print "Number of macros obsolete = $TotalMacrosMissed\n";