I open info readline and found: — Function: int rl_expand_prompt (char *prompt) Expand any special character sequences in PROMPT and set up the local Readline prompt redisplay variables. This function is called by `readline()’. It may also be called to expand the primary prompt if the `rl_on_new_line_with_prompt()’ function or `rl_already_prompted’ variable is used. It returns … Read more
type :load /path/to/file in Scala REPL. You can get complete list of available commands by typing :help
I may have found a way to do it. Create a file .pythonrc # ~/.pythonrc # enable syntax completion try: import readline except ImportError: print(“Module readline not available.”) else: import rlcompleter readline.parse_and_bind(“tab: complete”) then in your .bashrc file, add export PYTHONSTARTUP=~/.pythonrc That seems to work.
The fundamental trick is to recognize that parsing, however accomplished, happens in incremental steps, including the reading of the tokens one by one. At each incremental step, there is an opportunity to build part of the AST by combining AST fragments built by other incremental steps. This is a recursive idea, and it bottoms out … Read more
The bytecode is not actually interpreted to machine code, unless you are using some exotic implementation such as pypy. Other than that, you have the description correct. The bytecode is loaded into the Python runtime and interpreted by a virtual machine, which is a piece of code that reads each instruction in the bytecode and … Read more
I have implemented several parsers in C# – hand-written and tool generated. A very good introductory tutorial on parsing in general is Let’s Build a Compiler – it demonstrates how to build a recursive descent parser; and the concepts are easily translated from his language (I think it was Pascal) to C# for any competent … Read more
Yes, you can, on Scala 2.8. Note that, for this to work, you have to include the scala-compiler.jar in your classpath. If you invoke your scala program with scala, it will be done automatically (or so it seems in the tests I made). You can then use it like this: import scala.tools.nsc.Interpreter._ object TestDebugger { … Read more
The best paper I ever read on compilers is dated 1964 “META II a syntax-oriented compiler writing language” by Val Schorre. (http://doi.acm.org/10.1145/800257.808896) In 10 pages, he shows you how to build an astoundingly simple but very effective compiler-compiler, provides you with with the compiler-compiler grammar and provides you with enough details for you to hand … Read more
PHP is a compiled language since PHP 4.0 The idea of what is a compiler seems to be a subject that causes great confusion. Some people assume that a compiler is a program that converts source code in one language into an executable program. The definition of what is a compiler is actually broader than … Read more
Compilers Compilers were the first sort of translator program to be written. The idea is simple: You write the program, then hand it to the compiler which translates it. Then you run the result. Interpreters An interpreter is also a program that translates a high-level language into a low-level one, but it does it at … Read more