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|
from ply import lex
from ply import yacc
from makefilecom import expand
def scanmakefile(makefile):
tokens = (
"VAR",
"DOTVAR",
"END",
"COL",
"SEMICOL",
"EQ",
"PEQ",
"CEQ",
"QEQ",
"TEXT",
"COMMAND",
"PERCENT",
"ENDTAB",
"LIT",
"COMMA",
)
states = (
("com", "exclusive"),
("ccode", "exclusive"), #command code
)
# Match the first $(. Enter ccode state.
def t_ccode(t):
r'\$(\{|\()'
t.lexer.code_start = t.lexer.lexpos # Record the starting position
t.lexer.level = 1 # Initial level
t.lexer.begin('ccode') # Enter 'ccode' state
# Rules for the ccode state
def t_ccode_newcom(t):
r'\$(\{|\()'
t.lexer.level +=1
def t_ccode_endcom(t):
r'(\}|\))'
t.lexer.level -=1
# If closing command, return the code fragment
if t.lexer.level == 0:
t.value = t.lexer.lexdata[t.lexer.code_start-1:t.lexer.lexpos]
t.type = "COMMAND"
t.lexer.begin('INITIAL')
return t
def t_ccode_text(t):
r"[^\$\(\{\)\}]"
def t_begin_com(t):
r"\#"
t.lexer.push_state("com")
def t_com_other(t):
r"[^(\n|\\)]+"
pass
def t_com_newline(t):
r".*\\\n"
t.lexer.lineno += 1
pass
def t_com_END(t):
r"\n"
t.lexer.pop_state()
t.lexer.lineno += 1
return t
def t_EQ(t):
r"="
return t
def t_COL(t):
r":"
return t
def t_SEMICOL(t):
r";"
return t
def t_bsdexe(t): #Create a cleaner version
r".*\!=.*"
pass
def t_PERCENT(t):
r"\%"
return t
def t_PEQ(t):
r"[a-zA-Z_][a-zA-Z0-9_]*[ \t]*\+="
t.value = t.value.split()[0].rstrip("+=")
return t
def t_CEQ(t):
r"[a-zA-Z_][a-zA-Z0-9_]*[ \t]*:="
t.value = t.value.split()[0].rstrip(":=")
return t
def t_QEQ(t):
r"[a-zA-Z_][a-zA-Z0-9_]*[ \t]*\?="
t.value = t.value.split()[0].rstrip("?=")
return t
def t_VAR(t):
r"[a-zA-Z_][a-zA-Z0-9_]*[ \t]*="
t.value = t.value.split()[0].rstrip("=") #get the name of the var
return t
def t_DOTVAR(t):
r"\.[a-zA-Z_][a-zA-Z0-9_]*[ \t]*="
t.value = t.value.split()[0].rstrip("=") #get the name of the var
return t
def t_contline(t):
r"\\\n"
t.lexer.lineno += 1
pass
def t_LIT(t):
r"\\."
t.value = t.value[1] #take the literal char
return t
def t_COMMA(t):
r","
return t
def t_spacetab(t):
r"[ \t]"
pass
def t_ENDTAB(t):
r"\n\t"
t.lexer.lineno += 1
return t
def t_TEXT(t):
r"[^ \n\t:\\,]+"
return t
def t_END(t):
r"\n+"
t.lexer.lineno += t.value.count('\n')
return t
def t_ANY_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
lexer = lex.lex()
lexer.input(makefile)
for tok in lexer:
print(tok)
#YACC begins here
#a dict with values of defined variables
variables = {}
ivars = [] #keep track of the immediate variables
targets = [] #buildtargets, [[target,deps,options],[target2,....
def p_target(p):
def p_peq(p): #immediate if peq was defined as immediate before else deferred
"""
end : end PEQ textlst end
| PEQ textlst end
"""
if len(p) == 4:
if not p[1] in variables:
variables[p[1]] = p[2]
elif not p[1] in ivars:
variables[p[1]] += p[2]
else:
textvalue = expand(p[2]) #expand any variables
variables[p[1]] = textvalue
elif not p[2] in variables:
variables[p[2]] = p[3]
elif not p[2] in ivars:
variables[p[2]] += p[3]
else:
textvalue = expand(p[3]) #expand any variables
variables[p[2]] = textvalue
def p_ceq(p): #immediate
"""
end : end CEQ textlst end
| CEQ textlst end
"""
if len(p) == 4:
textvalue = expand(p[2]) #expand any variables
variables[p[1]] = textvalue
ivars.append(p[1])
else:
textvalue = expand(p[3]) #expand any variables
variables[p[2]] = textvalue
ivars.append(p[2])
def p_qeq(p): #deferred
"""
end : end QEQ textlst end
| QEQ textlst end
"""
if len(p) == 4 and not p[1] in variables:
variables[p[1]] = p[2]
elif not p[2] in variables:
variables[p[2]] = p[3]
def p_var(p): #deferred
"""
end : end VAR textlst end
| VAR textlst end
"""
if len(p) == 4:
variables[p[1]] = p[2]
else:
variables[p[2]] = p[3]
def p_textlst(p):
"""
textlst : textlst TEXT
| textlst command
| textlst LIT
| command
| TEXT
| LIT
"""
if len(p) == 3:
p[0] = p[1].append(p[2])
else:
p[0] = [p[1]]
def p_command(p):
"command: COMMAND"
p[0] = [p[1]] #commands are lists within the testlst
def p_end(p):
"""
end : END
| end END
"""
def p_error(p):
print("syntax error at '%s'" % p.type,p.lexpos)
pass
#yacc.yacc()
#yacc.parse(makefile)
#for target in targets:
# print(target)
#print(variables)
#return targets
#immediate
#deferred
file="Makefile2"
with open(file, encoding="utf-8", errors="replace") as inputfile:
scanmakefile(inputfile.read())
|
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