first meta-model – ISA\\Elements\Textuals

Parent

Elementary

Data
Textuals
Aliases None.
Information This is about the elementary  textual elements and operations.
Notes
Kind Explanation
Text Strings are the most used type in Information Technology. On a typical project one type on two is a string. So it requires to be highly optimized. So alternatively to have only one String type like in most languages, it is interesting to have several one for different purpose.
  • Key is a short string type specially designed for the access on association table.
  • String is a multipurpose fixed character length string designed for efficiency.
  • String Unicode, is an UTF-16 string to cover the whole string requirements in any language.
  • Text, is both a complete Unicode string and a typographic definition. It is composed of Glyph, coming from the typographical world. A Glyph is a of size with 32 bits for typographic characteristics and one symbol using UTF-32. This low level integrated and presentation could widely improve display rendering velocity by delegation to hardware components.
data
Edition
Version 1
Country None.
Language  None.
Tirage 1
Dependencies None.
Inhibit all invariants False.
Scope Ideas.
Diagram

 

Textuals Assembly

Classes
Glyph
Information A Glyph.

bit structure:

  • 1 to 32: Unicode 32.
  • 33 to 64: Presentation definition.

See this PDF document for a complete Glyph format definition.
Glyph
Key
Information Key is a short string type specially designed for the access on association table.

A Key has a fixed size of (1 ) to be aligned with µP register width. It is typicality intended to be used as key in associative tables. Its directly maps to its hash code. To be used in associative table, there is just to compute the modulo for the table capacity.
This type is specially designed to promote performance.

A Key may have

  1. either up to 10 characters encoded on 6 bits,
  2. or 5 ideograms among the 4096 most usual ones,
  3. and an optional prefix (Cf. Key prefix).

The allowed character are :

  • space
  • the 10 digits (de 0 à 9)
  • 52 rooms for letters:
    • Latin (default): the 26 letters upper or lower case (A  to Z and a to z)
    • Cyrillic: A selection of the most common forms of letters.
    • Arabic: the 20 isolated letters (ء and أ to ي) plus various meta-letters.

One room is reserved for padding.
See this PDF document for a complete Key characters  definition.

The allowed ideograms are:
Key
String
Information  A string of characters for basic multipurpose usage.

Remark: For performance reasons this type only supports the Unicode UTF-16 Basic Multilingual Plane (BMP).  For case where the String do not cover the functional requirements, the String Unicode must be used instead.
Note
Kind Explanation
Text The String type is the most used type in Information Technology. On a typical project one type on two is a string. So it requires to be highly optimized.
To achieve that, this String  is a multipurpose fixed character length string designed for efficiency. The length of a character is always 16 bits. It relies on the UCS-2 standard (similar to the very first version of UTF-16).
While the UCS-2 standard could appears to be out dated, it has several key advantages:
  • Its character set is 100% compatible with UTF-16 BMP.
  • Its fixed length improves the performance from a factor of 1.5 to 100 depending of the .
  • It character set is sufficient in major parts of the world for current language processing (Africa, America, Europe, Oceania and a large part of Asia).
A study has been made to determine if it is preferable to implement string with a raw buffer or with a sequence of a Characters type (each Characters having 4 character of 16 bits).  It conclude that a raw buffer is slightly preferable up to the moment µP have not dedicated instructions.
To preserve memory rooms the length and capacity are implemented as a single  : the 32 first bits are used for capacity and the 32 endian ones are for length. Then memory mapping is more efficient than C language because the size of the string is known without browsing it.
String, like other Elements, are mutable also for this performance reason. And it is also encouraged for µP to implements specific instruction to support basic operations of this type.
The capacity count the number of character rooms the buffer has. And the length count the number of individual effective character.
Formulas:
  • Capacity property = capacity 
  • Length property = length 
String
String Unicode
Information String Unicode, is an UTF-16 little endian string to cover the whole string requirements in any language.

In case of performance issues, consider using String instead of String Unicode.
String Unicode
Text
Information  A rich text composed of Glyph.

A text can references an . This can be done either by an external link to this , or by incorporating the in the text. To do that some special characters are used.

The ETX (End of Text) stop the regular text processing, the is linked by using the SO (Shift Out) character followed by the OID text form, the text restarting being signaled by a STX (Start of Text).
For , in a text to link to the N123 O456:
before the link ␃␎N123 O456␂ after the link
giving at rendering something possibly like that
before the link (⇑) after the link

It is also possible to include an Object in the Text with SI (Shift In) control character. In this case a rendering operation (display for ) is called on the Object to show it within the text. This is the way to include any kind of object like image, video, etc.

The effective displays depend of the renderer.
Queries
Substring(Start index: Natural* [0..1] = 1, End index: Natural* [0..1] = ∞): String
 This operation allows to get String from a Text part when the substring only contains BMP characters.

This operation is provided because many Type can be constructed from a String. The compiler can invoke these constructor from a source text using it.
Note
Kind Explanation
Text The Text, as all other Elements, has no hook to remain efficient in any case. If this feature is needed, like in text editor for , developers are encouraged to define their own text wrapper to support hooking.
Text
Other modules
Alignment
Information The aligments.

See this PDF document for a complete Glyph format definition.
Alignment
Back color
Information The back colors.

See this PDF document for a complete Glyph format definition.
Back color
Base fonts
Information The base fonts encountered everywhere.

See this PDF document for a complete Glyph format definition.
Base fonts
Borderlining
Information The line styles of a border.

See this PDF document for a complete Glyph format definition.
Borderlining
Color mode
Information The mode a color definition is set.

See this PDF document for a complete Glyph format definition.
Color mode
Key prefix
Information A prefix of the Key type.
Literal
Names Information
@ Address
# Number, Numbering
/ Parent
& Adding, Conjunction
§ Reference
? Interrogation, Request
! Action, Attention
% Percentage, Fraction
+ Plus, Increment
– Minus, Decrement
$ Value
= Nominal value
> Superior to, Lower value
Inferior to, Upper value
^ Pic, Maximum, Alert

 

Key prefix
Scripting
Information The scripting format of a glyph.

See this PDF document for a complete Glyph format definition.
Scripting
String insertion mode
Information The way to insert a String Unicode in Text.
Names Information
String Insert as a raw string without any typographical property.
Text as before Insert with the typographical property of the Glyph just before the insertion.
Text as after Insert with the typographical property of the Glyph just after the insertion.
Text as sample glyph Insert with the typographical property of the Glyph provided as sample.
String insertion mode
Underlining
Information The Underlining format of a glyph.

See this PDF document for a complete Glyph format definition.
Underlining
Assemblies

None.

 

Version and status

Version Date Description Status
V1R1 31-Dec-17 Initial. Candidate

Related posts:

  1. Relationships Assembly
  2. Containment Assembly
  3. Identity Assembly
  4. Elements Assembly
  5. Temporal Assembly
Tags: 64 bits, Assembly, Class, Classifier, Functional, Instance, LL, Model, Object, OID, sbyte, Scope, Uniform, Universe, Use Case

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.