Python Test Case Generator
Project description
Matthew Shaw <mshaw.cx@gmail.com>
<%pre
import sys
%>
::NT(start)
: 'A' # comment
| 'B' <% print($$) %>
;
<%post
print($$)
%>
Constants
Constants in productions can consist of double-quoted strings, single-quoted strings, decimal, hexadecimal.
A: "A" | 'A' | \d65 | \x41;
Concatenation
Productions are concatenated when they are seperated by white-space.
CONCAT: "CONC" \x41 "TEN" \d65 "TION";
Selection
When multiple productions are present one is chosen at random.
NUMBER: '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9';
Grouping
GRP: ('A'|'B') ('C'|'D');
Possible values are ‘AC’, ‘AD’, ‘BC’, or ‘BD’.
Ranges
NUM1: ('0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'){3};
NUM2: ('0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'){1,5};
NUM1 will generate a 3-digit number while NUM2 will generate a number of random length between 1 and 5 digits.
Slicing
A sub-string of a production can be referenced using indices.
SLICE1: "0123456789" [:]; // 0123456789
SLICE2: "0123456789" [4]; // 4
SLICE3: "0123456789" [:4]; // 0123
SLICE4: "0123456789" [4:]; // 456789
SLICE5: "0123456789" [2:8]; // 234567
SLICE6: "0123456789" [-4]; // 6
SLICE7: "0123456789" [-4:]; // 6789
SLICE8: "0123456789" [:-4]; // 012345
SLICE9: "0123456789" [2:-2]; // 234567
The output of each production is documented in the comment proceeding it.
Inline Python
<%pre
import base64
%>
NT: %base64.b64encode('string');
Non-Terminals
NT1: "The value of NT2 is " NT2;
NT2: "substitution";
Semantic Actions
$$
PSA1: PSA2 <% var = $$ %>;
PSA2: "one" | "two";
In this example the Python variable var will contain either ‘one’ or ‘two’ for future use.
Variable Non-Terminals
$*
NT1: $NT2;
$NT2:
"I WILL BE SUBSTITUTED INTO NT1 IN LOWERCASE"
<%
$* = $$.lower()
%>
;
Back Reference
BR: "A" | "B";
NT: BR \BR;
$BR: ("a"|"b") <% $* = $$.upper() %>;
NT: $BR \$BR;
In both cases NT will generate the string ‘AA’ or ‘BB’ but not ‘AB’ or ‘BA’.
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