From 868c9eceed1355f78fa0271b0d67092a2b448d40 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Wed, 23 May 2018 09:15:46 +0200
Subject: lowlevelunit.pas: some new escape functions

---
 lowlevelunit.pas | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/lowlevelunit.pas b/lowlevelunit.pas
index 6a53d08..5a09da9 100644
--- a/lowlevelunit.pas
+++ b/lowlevelunit.pas
@@ -55,6 +55,7 @@ type
   tWarnstufe = (wsStreng,wsLasch);
   tGenauigkeit = (gSingle,gDouble,gExtended);
   tKantenFilterTyp = (kfTiefpass,kfHochpass);
+  tRegexTyp = (rtKein,rtFpc,rtShell);
 
 operator = (x1,x2: t2x2Extended): boolean;
 operator = (x1,x2: t2x2Int64): boolean;
@@ -158,6 +159,10 @@ procedure splitStrToInt(s: string; out ia: tLongintArray);
 function vergleicheStrings(s1,s2: string): integer;
 function pruefSumme(s: string; m: longestOrdinal): longestOrdinal; inline;
 
+function unEscapeCommas(s: string): string;
+function escape(s,toe,es: string): string;
+function escapeStringToRegex(s: string; typ: tRegexTyp; extras: string = ''): string; inline;
+
 var
   base64Chars: array[0..63] of char;
   base64CharsInvers: array[char] of byte;
@@ -1323,6 +1328,40 @@ begin
     result:=((result*256)+ord(s[i])) mod m;
 end;
 
+function unEscapeCommas(s: string): string;
+begin
+  result:=s;
+  while pos('\,',result)>0 do
+    delete(result,pos('\,',result),1);
+end;
+
+function escape(s,toe,es: string): string;
+var
+  i,j: longint;
+  b:   boolean;
+begin
+  result:='';
+  for i:=1 to length(s) do begin
+    b:=false;
+    for j:=1 to length(toe) do
+      b:=b or (toe[j]=s[i]);
+    if b then result:=result+es;
+    result:=result+s[i];
+  end;
+end;
+
+function escapeStringToRegex(s: string; typ: tRegexTyp; extras: string = ''): string;
+begin
+  case typ of
+    rtKein:
+      result:=s;
+    rtFpc:
+      result:=escape(s,'\.[+^$'+extras,'\');
+    rtShell:
+      result:=escape(s,'\.[^$'+extras,'\');
+  end{of case};
+end;
+
 var
   b: byte;
 
-- 
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