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author | David Beazley <dave@dabeaz.com> | 2022-10-27 13:44:12 -0500 |
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committer | David Beazley <dave@dabeaz.com> | 2022-10-27 13:44:12 -0500 |
commit | af80858e888c5f36979da88fcb1080de7b848967 (patch) | |
tree | 2f2fb95414baee83e489eac1b936602599ea9eba /test/yacc_uprec2.py | |
parent | 818ab0684e33f5f513fc839673ff56ea330b6380 (diff) | |
download | ply-af80858e888c5f36979da88fcb1080de7b848967.tar.gz |
Reorganization. Added makefile
Diffstat (limited to 'test/yacc_uprec2.py')
-rw-r--r-- | test/yacc_uprec2.py | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/test/yacc_uprec2.py b/test/yacc_uprec2.py deleted file mode 100644 index 73274bf..0000000 --- a/test/yacc_uprec2.py +++ /dev/null @@ -1,63 +0,0 @@ -# ----------------------------------------------------------------------------- -# yacc_uprec2.py -# -# A grammar with a bad %prec specifier -# ----------------------------------------------------------------------------- -import sys - -if ".." not in sys.path: sys.path.insert(0,"..") -import ply.yacc as yacc - -from calclex import tokens - -# Parsing rules - -# dictionary of names -names = { } - -def p_statement_assign(t): - 'statement : NAME EQUALS expression' - names[t[1]] = t[3] - -def p_statement_expr(t): - 'statement : expression' - print(t[1]) - -def p_expression_binop(t): - '''expression : expression PLUS expression - | expression MINUS expression - | expression TIMES expression - | expression DIVIDE expression''' - if t[2] == '+' : t[0] = t[1] + t[3] - elif t[2] == '-': t[0] = t[1] - t[3] - elif t[2] == '*': t[0] = t[1] * t[3] - elif t[2] == '/': t[0] = t[1] / t[3] - -def p_expression_uminus(t): - 'expression : MINUS expression %prec' - t[0] = -t[2] - -def p_expression_group(t): - 'expression : LPAREN expression RPAREN' - t[0] = t[2] - -def p_expression_number(t): - 'expression : NUMBER' - t[0] = t[1] - -def p_expression_name(t): - 'expression : NAME' - try: - t[0] = names[t[1]] - except LookupError: - print("Undefined name '%s'" % t[1]) - t[0] = 0 - -def p_error(t): - print("Syntax error at '%s'" % t.value) - -yacc.yacc() - - - - |