05f12bfffa
In python 3, range() does what xrange() used to do and xrange() does not exist. If you want to write code that will run on both Python 2 and Python 3, you can't use xrange(). range() can actually be faster in some cases - eg. if iterating over the same sequence multiple times. xrange() has to reconstruct the integer object every time, but range() will have real integer objects. (It will always perform worse in terms of memory however) xrange() isn't usable in all cases where a real list is needed. For instance, it doesn't support slices, or any list methods. Change-Id: I5233438a864bb00d04ba7fb2b1688cacb0473691 |
||
|---|---|---|
| .. | ||
| README.md | ||
| __init__.py | ||
| ast.py | ||
| base_ast.py | ||
| config.py | ||
| const.py | ||
README.md
Grammar
This folder is all about the definition of the banana grammar.
The grammar purpose is to convert the input, text, into an
abstract syntax tree (AST).
This is the first step of the pipeline:
+--------+ +---------+
| | | |
| Text | --- grammar ---> | AST | --->
| | | |
+--------+ +---------+
The module ast.py contains all the possible ASTNode which
itself is defined in base_ast.py.
Current status
- Parsing connections such as
a -> b,a -> [b, c],[a, b] -> [c, d] - Parsing numbers
- Parsing string literals
- Parsing booleans
- Parsing assignments where the left hand side can be a property or an identifier.
- Parsing assignments where the right hand side is a number, a string literal, a property or an identifier.
- Parsing components arguments using a constructor-like syntax.
- Parsing ingestors generators (for JSON dialect)
- Parsing imports such as
from ldp.monasca import * - Parsing disconnections such as
a !-> b(requires imports)
Tests
All test regarding the grammar (i.e. the syntax and the way
the AST is built) is defined in test/banana/grammar.
This folder looks like this:
test/banana/grammar
├── should_fail
│ ├── ...
│ └── file.banana
├── should_pass
│ ├── ...
│ └── file.banana
└── test_config.py
The test_config generates one test for each file in the
should_pass and should_fail directories.
Test can assert various things using instructions below.
Available instruction
# RAISE <exception-name>: Check thatexception-nameis raised.# STMT_EQ <ast-of-statements>Check the AST of statements.# AST_EQ <full-ast>Check the full AST.# CONN_EQ <ast-of-connections>Check the AST of connections.