module languages.antlr_grammar_use

Short summary

module pyensae.languages.antlr_grammar_use

Use grammar This module requires antlr4-python3-runtime.

source on GitHub

Functions

function	truncated documentation
get_parser_lexer	Returns two classes, a parser and a lexer from antlr4.
get_tree_graph	Returns a graph with networkx.
get_tree_string	Returns a string which shows the parsed tree.
parse_code	Parses a code and returns a tree.

Documentation

Use grammar This module requires antlr4-python3-runtime.

source on GitHub

pyensae.languages.antlr_grammar_use.get_parser_lexer(language)

Returns two classes, a parser and a lexer from antlr4.

Parameters

language – to analyse

Returns

Parser, Lexer

source on GitHub

pyensae.languages.antlr_grammar_use.get_tree_graph(tree, parser, format=<class 'pyensae.languages.tree_graph_listener.TreeGraphListener'>)

Returns a graph with networkx.

Parameters

• tree – from parse_code

• parser – the parser used to build the tree, output of parse_code

• format – None or a class ParseTreeListener

Returns

string

source on GitHub

pyensae.languages.antlr_grammar_use.get_tree_string(tree, parser, format=<class 'pyensae.languages.tree_string_listener.TreeStringListener'>)

Returns a string which shows the parsed tree.

Parameters

• tree – from parse_code

• parser – the parser used to build the tree, output of parse_code

• format –

  None or a class ParseTreeListener

Returns

string

source on GitHub

pyensae.languages.antlr_grammar_use.parse_code(code, class_parser, class_lexer)

Parses a code and returns a tree.

Parameters

• code – code to parse

• class_parser – parser

• class_lexer – lexer

Returns

parsed code

Check the syntax of a script PIG

code = '''
A = LOAD 'filename.txt' USING PigStorage('  ');
STORE A INTO 'samefile.txt' ;
'''

clparser, cllexer = get_parser_lexer("Pig")
parser = parse_code(code, clparser, cllexer)
tree = parser.parse()
st = get_tree_string(tree, parser, None)
print(st)

source on GitHub