Compile a flex/bison compiler using Scons

While working with Flex and Bison to build a compiler, I wanted to stick with Python a little. That's why I use Scons to build C/C++ files and the final application. I did not find any complete Sconstruct file to build such application, that's why I want to share mine.

The following SConstruct file (configuration file for Scons) could be used to compile the Flex/Bison example written by Timo Bingmann.

# -*- coding: utf-8 -*- # Damien Riquet (d.riquet@gmail.com) # WTFPL Licence # December, 2012 # SConstruct file to compile a compiler # Here, we use Flex and Bison to do this # Scons knows flex as lex and bison as yacc (older versions) # This file has been designed to compile the Flex/Bison example written by Timo Bingmann # It can be found here: http://panthema.net/2007/flex-bison-cpp-example/ # 0) Build environment # -------------------- env = Environment() # Add a Bison (yacc) flag so that it creates an header file (parser.h) env.Append(YACCFLAGS='--defines=parser.h') # g++ compile flags env.Append(CXXFLAGS="-W -Wall -Wextra -ansi -g") # List of source files needed for the final compilation sources = ["driver.cc", "exprtest.cc"] # 1) Generate C++ files from lexer and analyzer files # -------------------- # We use here the CXXFile class that uses flex or bison accordingly to the source file sources += env.CXXFile(source='scanner.ll') sources += env.CXXFile(source='parser.yy') # 2) Build the application thanks to Program class # -------------------- env.Program("exprtest", sources)

Feel free to use this code. Beerware / WTFPL licence.

Parse a JSON file with comments

I like to use JSON files with python. It's very simple to read and use such files. For example:

JSON file

{
    "username": "John Smith",
    "age": 42,
    "list": ["a", "b", "c"]
}

Python script

import json

with open('file.json') as f:
    d = json.load(f)
    print d['username']
    print d ...

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Compare two versions of a TeX file in a Git repository

When writting an article, you may want to get a diff of a TeX file to send it to your advisor, collaborators or reviewers. The tool latexdiff generates a diff of two TeX files but it does not manage inputs, includes or bibliography. Also, when you are using a RCS ...

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Damien Riquet

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Parse a JSON file with comments

Compare two versions of a TeX file in a Git repository