with Ada.Strings.Maps;
+-- The language-defined package Strings.Fixed provides string-handling
+-- subprograms for fixed-length strings; that is, for values of type
+-- Standard.String. Several of these subprograms are procedures that modify
+-- the contents of a String that is passed as an out or an in out parameter;
+-- each has additional parameters to control the effect when the logical
+-- length of the result differs from the parameter's length.
+--
+-- For each function that returns a String, the lower bound of the returned
+-- value is 1.
+--
+-- The basic model embodied in the package is that a fixed-length string
+-- comprises significant characters and possibly padding (with space
+-- characters) on either or both ends. When a shorter string is copied to a
+-- longer string, padding is inserted, and when a longer string is copied to a
+-- shorter one, padding is stripped. The Move procedure in Strings.Fixed,
+-- which takes a String as an out parameter, allows the programmer to control
+-- these effects. Similar control is provided by the string transformation
+-- procedures.
+
package Ada.Strings.Fixed is
pragma Preelaborate;
Drop : Truncation := Error;
Justify : Alignment := Left;
Pad : Character := Space);
+ -- The Move procedure copies characters from Source to Target. If Source
+ -- has the same length as Target, then the effect is to assign Source to
+ -- Target. If Source is shorter than Target then:
+ --
+ -- * If Justify=Left, then Source is copied into the first Source'Length
+ -- characters of Target.
+ --
+ -- * If Justify=Right, then Source is copied into the last Source'Length
+ -- characters of Target.
+ --
+ -- * If Justify=Center, then Source is copied into the middle Source'Length
+ -- characters of Target. In this case, if the difference in length
+ -- between Target and Source is odd, then the extra Pad character is on
+ -- the right.
+ --
+ -- * Pad is copied to each Target character not otherwise assigned.
+ --
+ -- If Source is longer than Target, then the effect is based on Drop.
+ --
+ -- * If Drop=Left, then the rightmost Target'Length characters of Source
+ -- are copied into Target.
+ --
+ -- * If Drop=Right, then the leftmost Target'Length characters of Source
+ -- are copied into Target.
+ --
+ -- * If Drop=Error, then the effect depends on the value of the Justify
+ -- parameter and also on whether any characters in Source other than Pad
+ -- would fail to be copied:
+ --
+ -- * If Justify=Left, and if each of the rightmost
+ -- Source'Length-Target'Length characters in Source is Pad, then the
+ -- leftmost Target'Length characters of Source are copied to Target.
+ --
+ -- * If Justify=Right, and if each of the leftmost
+ -- Source'Length-Target'Length characters in Source is Pad, then the
+ -- rightmost Target'Length characters of Source are copied to Target.
+ --
+ -- * Otherwise, Length_Error is propagated.
------------------------
-- Search Subprograms --
function Index
(Source : String;
Pattern : String;
+ From : Positive;
Going : Direction := Forward;
- Mapping : Maps.Character_Mapping := Maps.Identity) return Natural;
+ Mapping : Maps.Character_Mapping_Function) return Natural;
+ pragma Ada_05 (Index);
function Index
(Source : String;
Pattern : String;
+ From : Positive;
Going : Direction := Forward;
- Mapping : Maps.Character_Mapping_Function) return Natural;
+ Mapping : Maps.Character_Mapping := Maps.Identity) return Natural;
+ pragma Ada_05 (Index);
- function Index
- (Source : String;
- Set : Maps.Character_Set;
- Test : Membership := Inside;
- Going : Direction := Forward) return Natural;
+ -- Each Index function searches, starting from From, for a slice of
+ -- Source, with length Pattern'Length, that matches Pattern with respect to
+ -- Mapping; the parameter Going indicates the direction of the lookup. If
+ -- Source is the null string, Index returns 0; otherwise, if From is not in
+ -- Source'Range, then Index_Error is propagated. If Going = Forward, then
+ -- Index returns the smallest index I which is greater than or equal to
+ -- From such that the slice of Source starting at I matches Pattern. If
+ -- Going = Backward, then Index returns the largest index I such that the
+ -- slice of Source starting at I matches Pattern and has an upper bound
+ -- less than or equal to From. If there is no such slice, then 0 is
+ -- returned. If Pattern is the null string, then Pattern_Error is
+ -- propagated.
function Index
(Source : String;
Pattern : String;
- From : Positive;
Going : Direction := Forward;
Mapping : Maps.Character_Mapping := Maps.Identity) return Natural;
- pragma Ada_05 (Index);
function Index
(Source : String;
Pattern : String;
- From : Positive;
Going : Direction := Forward;
Mapping : Maps.Character_Mapping_Function) return Natural;
- pragma Ada_05 (Index);
+
+ -- If Going = Forward, returns:
+ --
+ -- Index (Source, Pattern, Source'First, Forward, Mapping)
+ --
+ -- otherwise, returns:
+ --
+ -- Index (Source, Pattern, Source'Last, Backward, Mapping).
+
+ function Index
+ (Source : String;
+ Set : Maps.Character_Set;
+ Test : Membership := Inside;
+ Going : Direction := Forward) return Natural;
function Index
(Source : String;
Test : Membership := Inside;
Going : Direction := Forward) return Natural;
pragma Ada_05 (Index);
+ -- Index searches for the first or last occurrence of any of a set of
+ -- characters (when Test=Inside), or any of the complement of a set of
+ -- characters (when Test=Outside). If Source is the null string, Index
+ -- returns 0; otherwise, if From is not in Source'Range, then Index_Error
+ -- is propagated. Otherwise, it returns the smallest index I >= From (if
+ -- Going=Forward) or the largest index I <= From (if Going=Backward) such
+ -- that Source(I) satisfies the Test condition with respect to Set; it
+ -- returns 0 if there is no such Character in Source.
function Index_Non_Blank
(Source : String;
+ From : Positive;
Going : Direction := Forward) return Natural;
+ pragma Ada_05 (Index_Non_Blank);
+ -- Returns Index (Source, Maps.To_Set(Space), From, Outside, Going)
function Index_Non_Blank
(Source : String;
- From : Positive;
Going : Direction := Forward) return Natural;
- pragma Ada_05 (Index_Non_Blank);
+ -- Returns Index (Source, Maps.To_Set(Space), Outside, Going)
function Count
(Source : String;
Pattern : String;
Mapping : Maps.Character_Mapping_Function) return Natural;
+ -- Returns the maximum number of nonoverlapping slices of Source that match
+ -- Pattern with respect to Mapping. If Pattern is the null string then
+ -- Pattern_Error is propagated.
+
function Count
(Source : String;
Set : Maps.Character_Set) return Natural;
+ -- Returns the number of occurrences in Source of characters that are in
+ -- Set.
procedure Find_Token
(Source : String;
First : out Positive;
Last : out Natural);
pragma Ada_2012 (Find_Token);
+ -- If Source is not the null string and From is not in Source'Range, then
+ -- Index_Error is raised. Otherwise, First is set to the index of the first
+ -- character in Source(From .. Source'Last) that satisfies the Test
+ -- condition. Last is set to the largest index such that all characters in
+ -- Source(First .. Last) satisfy the Test condition. If no characters in
+ -- Source(From .. Source'Last) satisfy the Test condition, First is set to
+ -- From, and Last is set to 0.
procedure Find_Token
(Source : String;
Test : Membership;
First : out Positive;
Last : out Natural);
+ -- Equivalent to Find_Token (Source, Set, Source'First, Test, First, Last)
------------------------------------
-- String Translation Subprograms --
function Translate
(Source : String;
- Mapping : Maps.Character_Mapping) return String;
-
- procedure Translate
- (Source : in out String;
- Mapping : Maps.Character_Mapping);
+ Mapping : Maps.Character_Mapping_Function) return String;
function Translate
(Source : String;
- Mapping : Maps.Character_Mapping_Function) return String;
+ Mapping : Maps.Character_Mapping) return String;
+
+ -- Returns the string S whose length is Source'Length and such that S (I)
+ -- is the character to which Mapping maps the corresponding element of
+ -- Source, for I in 1 .. Source'Length.
procedure Translate
(Source : in out String;
Mapping : Maps.Character_Mapping_Function);
+ procedure Translate
+ (Source : in out String;
+ Mapping : Maps.Character_Mapping);
+
+ -- Equivalent to Source := Translate(Source, Mapping)
+
---------------------------------------
-- String Transformation Subprograms --
---------------------------------------
- function Replace_Slice
- (Source : String;
- Low : Positive;
- High : Natural;
- By : String) return String;
-
procedure Replace_Slice
(Source : in out String;
Low : Positive;
Drop : Truncation := Error;
Justify : Alignment := Left;
Pad : Character := Space);
+ -- If Low > Source'Last+1, or High < Source'First - 1, then Index_Error is
+ -- propagated. Otherwise:
+ --
+ -- * If High >= Low, then the returned string comprises
+ -- Source (Source'First .. Low - 1)
+ -- & By & Source(High + 1 .. Source'Last), but with lower bound 1.
+ --
+ -- * If High < Low, then the returned string is
+ -- Insert (Source, Before => Low, New_Item => By).
+
+ function Replace_Slice
+ (Source : String;
+ Low : Positive;
+ High : Natural;
+ By : String) return String;
+ -- Equivalent to:
+ --
+ -- Move (Replace_Slice (Source, Low, High, By),
+ -- Source, Drop, Justify, Pad).
function Insert
(Source : String;
Before : Positive;
New_Item : String) return String;
+ -- Propagates Index_Error if Before is not in
+ -- Source'First .. Source'Last+1; otherwise, returns
+ -- Source (Source'First .. Before - 1)
+ -- & New_Item & Source(Before..Source'Last), but with lower bound 1.
procedure Insert
(Source : in out String;
Before : Positive;
New_Item : String;
Drop : Truncation := Error);
+ -- Equivalent to Move (Insert (Source, Before, New_Item), Source, Drop)
function Overwrite
(Source : String;
Position : Positive;
New_Item : String) return String;
+ -- Propagates Index_Error if Position is not in
+ -- Source'First .. Source'Last + 1; otherwise, returns the string obtained
+ -- from Source by consecutively replacing characters starting at Position
+ -- with corresponding characters from New_Item. If the end of Source is
+ -- reached before the characters in New_Item are exhausted, the remaining
+ -- characters from New_Item are appended to the string.
procedure Overwrite
(Source : in out String;
Position : Positive;
New_Item : String;
Drop : Truncation := Right);
+ -- Equivalent to Move(Overwrite(Source, Position, New_Item), Source, Drop)
function Delete
(Source : String;
From : Positive;
Through : Natural) return String;
+ -- If From <= Through, the returned string is
+ -- Replace_Slice(Source, From, Through, ""); otherwise, it is Source with
+ -- lower bound 1.
procedure Delete
(Source : in out String;
Through : Natural;
Justify : Alignment := Left;
Pad : Character := Space);
+ -- Equivalent to:
+ --
+ -- Move (Delete (Source, From, Through),
+ -- Source, Justify => Justify, Pad => Pad).
---------------------------------
-- String Selector Subprograms --
function Trim
(Source : String;
Side : Trim_End) return String;
+ -- Returns the string obtained by removing from Source all leading Space
+ -- characters (if Side = Left), all trailing Space characters (if
+ -- Side = Right), or all leading and trailing Space characters (if
+ -- Side = Both).
procedure Trim
(Source : in out String;
Side : Trim_End;
Justify : Alignment := Left;
Pad : Character := Space);
+ -- Equivalent to:
+ --
+ -- Move (Trim (Source, Side), Source, Justify=>Justify, Pad=>Pad).
function Trim
(Source : String;
Left : Maps.Character_Set;
Right : Maps.Character_Set) return String;
+ -- Returns the string obtained by removing from Source all leading
+ -- characters in Left and all trailing characters in Right.
procedure Trim
(Source : in out String;
Right : Maps.Character_Set;
Justify : Alignment := Strings.Left;
Pad : Character := Space);
+ -- Equivalent to:
+ --
+ -- Move (Trim (Source, Left, Right),
+ -- Source, Justify => Justify, Pad=>Pad).
function Head
(Source : String;
Count : Natural;
Pad : Character := Space) return String;
+ -- Returns a string of length Count. If Count <= Source'Length, the string
+ -- comprises the first Count characters of Source. Otherwise, its contents
+ -- are Source concatenated with Count - Source'Length Pad characters.
procedure Head
(Source : in out String;
Count : Natural;
Justify : Alignment := Left;
Pad : Character := Space);
+ -- Equivalent to:
+ --
+ -- Move (Head (Source, Count, Pad),
+ -- Source, Drop => Error, Justify => Justify, Pad => Pad).
function Tail
(Source : String;
Count : Natural;
Pad : Character := Space) return String;
+ -- Returns a string of length Count. If Count <= Source'Length, the string
+ -- comprises the last Count characters of Source. Otherwise, its contents
+ -- are Count-Source'Length Pad characters concatenated with Source.
procedure Tail
(Source : in out String;
Count : Natural;
Justify : Alignment := Left;
Pad : Character := Space);
+ -- Equivalent to:
+ --
+ -- Move (Tail (Source, Count, Pad),
+ -- Source, Drop => Error, Justify => Justify, Pad => Pad).
----------------------------------
-- String Constructor Functions --
(Left : Natural;
Right : String) return String;
+ -- These functions replicate a character or string a specified number of
+ -- times. The first function returns a string whose length is Left and each
+ -- of whose elements is Right. The second function returns a string whose
+ -- length is Left * Right'Length and whose value is the null string if
+ -- Left = 0 and otherwise is (Left - 1)*Right & Right with lower bound 1.
+
end Ada.Strings.Fixed;
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