Download Scripting Languages for Web - Programming Languages - Lecture Slides and more Slides Programming Languages in PDF only on Docsity! Ada – 1983 History’s largest design effort • Huge design effort, involving hundreds of people, lots of money and about eight years of designing effort • Contributions: • Packages - support for data abstraction • Elaborate exception handling mechanism • Facility for generic program units (templates) • Facility for concurrency - through the tasking model • Comments: • Competitive design • Included all that was known about software engineering and language design at that time • First compilers were very difficult; • The first usable compiler came nearly five years after the language design was completed Docsity.com Smalltalk - 1980 • Developed at Xerox PARC, initially by Alan Kay, later by Adele Goldberg • First full implementation of an object-oriented language • It had data abstraction, inheritance, and dynamic type binding • Purest object-oriented language yet! • Pioneered the graphical user interface everyone now uses Docsity.com C#- 2002 • Part of the .NET framework • Language for component-based software development • Based upon C++ and Java • Took some ideas from Visual Basic • Intermediate Language (IL) • Just-in-time compiler • Brought back pointers, structs, enum types, operator overloading, goto statement • Has safer enum types, more useful struct types, modified switch statement • Some other additions Docsity.com Scripting Languages for Web • Address the need for computations associated with HTML documents • JavaScript is used on the client side and PHP is used on the server side • JavaScript – client side – Primary objective is to create dynamic HTML documents and check validity of input forms – It is usually embedded in an HTML document – Its not related to Java Docsity.com Scripting Languages for Web • PHP (Personal Home Page) – server side – Interpreted on the Web Server when the HTML document in which it is embedded is requested by the browser – Often produces HTML code as an output – Similar to JavaScript – Allows simple access to HTML form data – makes form processing easier – It provides support for many different database management systems and provides web access to databases Docsity.com Analysis and Elaboration– 60’s • Analysis for the purpose of constructing models and theories of programming languages • PL/1, Simula, Algol 68, Snobol • Elaboration of earlier languages • An attempt to achieve greater richness by synthesis of existing features and generalization • Resulted in greater complexity • Formal languages and automata theory with applications to parsing and compiler theory • Theory of operational and mathematical semantics were developed • Language definition techniques were developed • Basic ideas of program correctness and verification • Lambda Calculus for abstract structures Docsity.com Programming Language Evolution • Effective software technology – 70’s – Software Engineering Support – structured design • 1980’s – Support for SE continued • 1990’s and 2000’s – Support for OOP and Internet • 2010’s – Aspect Oriented Programming? Docsity.com Software Engineering – 70’s • From pure research to practical management of the environment • Decreasing hardware cost and increasing software cost resulted in breaking complexity barrier • Development of tools and methodologies for controlling the complexities, cost and reliability of large programs • Structured programming, modular design and verification • Verifiable languages – Pascal, Modula Docsity.com
