add parser for arbitrary sequence execution

supports normal sequencing, ranges, loops and nesting

add parser for arbitrary sequence execution
supports normal sequencing, ranges, loops and nesting
04b120f3 · Juan David González Cobas · fed955e7 · 04b120f3
Commit 04b120f3 authored May 17, 2011 by Juan David González Cobas
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parse.py parse.py +61 -0

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--- a/parse.py
+++ b/parse.py
+#!   /usr/bin/env   python
+#    coding: utf8
+import sys
+from ply import lex, yacc
+tokens = (
+    'NUMBER',
+    'REPEAT',
+    'LPAREN',
+    'RPAREN',
+    'DASH',
+)
+t_NUMBER = r'[0-9]+'
+t_REPEAT = r'repeat'
+t_LPAREN = r'\('
+t_RPAREN = r'\)'
+t_DASH   = r'-'
+t_ignore = ' \t'
+def t_error(t):
+    print 'Illegal character [%s]' % t.value[0]
+    t.lexer.skip(1)
+lexer = lex.lex()
+def p_battery_sequence(p):
+    '''battery : batch
+               | batch battery'''
+    if len(p) == 2:
+        p[0] = [ p[1] ]
+    else:
+        p[0] = [ p[1] ] + p[2]
+def p_batch_single(p):
+    'batch : tst'
+    p[0] = p[1]
+def p_batch_loop(p):
+    'batch : REPEAT NUMBER LPAREN battery RPAREN'
+    p[0] = [ 'loop', p[2] ] + p[4]
+def p_batch_range(p):
+    'batch : tst DASH tst'
+    p[0] = [ 'range', p[1], p[3] ]
+def p_tst(p):
+    'tst : NUMBER'
+    p[0] = p[1]
+def p_error(p):
+    print 'syntax error!'
+parser = yacc.yacc()
+if __name__ == '__main__':
+    result = parser.parse(sys.argv[1])
+    print result