FEM: tokes module, some but not all pep8 codeformating

This commit is contained in:
Bernd Hahnebach
2020-02-16 22:47:35 +01:00
parent 938cc4ed39
commit 2ed72879ef

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@@ -24,10 +24,18 @@ __author__ = "Werner Mayer"
__url__ = "http://www.freecadweb.org"
tokens = (
'NAME','FLOAT','INT',
'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
'LPAREN','RPAREN','COMMENT',
)
'NAME',
'FLOAT',
'INT',
'PLUS',
'MINUS',
'TIMES',
'DIVIDE',
'EQUALS',
'LPAREN',
'RPAREN',
'COMMENT',
)
# Tokens
@@ -40,53 +48,64 @@ t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
def t_FLOAT(t):
r'\d+\.(\d+)?([eE][-+]?\d+)?'
t.value = float(t.value)
return t
def t_INT(t):
r'\d+'
t.value = int(t.value)
return t
# Ignored characters
t_ignore = " \t"
def t_COMMENT(t):
r'\#.*'
pass
def t_newline(t):
r'\n+'
t.lexer.lineno += t.value.count("\n")
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
import ply.lex as lex
lex.lex()
# Precedence rules for the arithmetic operators
precedence = (
('left','PLUS','MINUS'),
('left','TIMES','DIVIDE'),
('right','UMINUS'),
)
('left', 'PLUS', 'MINUS'),
('left', 'TIMES', 'DIVIDE'),
('right', 'UMINUS'),
)
# dictionary of names (for storing variables)
names = { }
names = {}
def p_statement_assign(p):
'statement : NAME EQUALS expression'
names[p[1]] = p[3]
def p_statement_expr(p):
'statement : expression'
print(p[1])
def p_expression_binop(p):
'''expression : expression PLUS expression
| expression MINUS expression
@@ -97,22 +116,27 @@ def p_expression_binop(p):
elif p[2] == '*': p[0] = p[1] * p[3]
elif p[2] == '/': p[0] = p[1] / p[3]
def p_expression_uminus(p):
'expression : MINUS expression %prec UMINUS'
p[0] = -p[2]
def p_expression_group(p):
'expression : LPAREN expression RPAREN'
p[0] = p[2]
def p_expression_float(p):
'expression : FLOAT'
p[0] = p[1]
def p_expression_int(p):
'expression : INT'
p[0] = p[1]
def p_expression_name(p):
'expression : NAME'
try:
@@ -121,8 +145,10 @@ def p_expression_name(p):
print("Undefined name '%s'" % p[1])
p[0] = 0
def p_error(p):
print("Syntax error at '%s'" % p.value)
import ply.yacc as yacc
yacc.yacc()