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|
from ply import lex
from ply import yacc
def scanacfile(acfile):
"""Scan a autoconfigure (.in/.ac) file.
Returns ....
"""
tokens = (
"FUNC",
"FUNCOPT", #func options
"FUNCEND",
"VAR",
"ECHO",
"TEXT",
"IF",
"IFCOM",
"ELIF",
"ELSE",
"THEN",
"IFEND",
"CASE",
"CASEOPT",
"COPTEND", #case opt end, doesn't need to be there but SHOULD
"CASEEND",
)
states = (
("func", "exclusive"),
("funcopt", "exclusive"),
("case", "inclusive"),
("if", "inclusive"),
)
def t_contline(t):
r"\\\n"
t.lexer.lineno += 1
pass
def t_ANY_space(t):
r"[ \t]"
pass
def t_ANY_newline(t):
r"\n"
t.lexer.lineno += 1
pass
def t_INITIAL_func_FUNC(t):
r'[a-zA-Z_][a-zA-Z0-9_]*\('
t.lexer.push_state('func')
t.value = t.value[:-1] #return name of func
return t
def t_func_funcopt(t):
r'\['
t.lexer.code_start = t.lexer.lexpos # Record the starting position
t.lexer.level = 1 # Initial level
t.lexer.push_state('funcopt') # Enter 'ccode' state
# Rules for the ccode state
def t_funcopt_newcom(t):
r'\['
t.lexer.level +=1
def t_funcopt_endcom(t):
r'\]'
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 = "FUNCOPT"
t.lexer.lineno += t.value.count('\n')
t.lexer.pop_state()
return t
def t_funcopt_opt(t):
r"[^\\\[\]]+"
def t_funcopt_contline(t):
r"\\\n"
def t_func_FUNCOPT(t):
r"[^\\\(\)\[\],]+"
t.lexer.lineno += t.value.count('\n')
return t
def t_func_comma(t):
r"[ \t]*,(,|[ \t])*"
numcommas = t.value.count(',')
if numcommas > 1:
numcommas -= 1 #,,, -> ,[],[],
t.type = "FUNCOPT"
t.value = []
while numcommas:
numcommas -= 1
t.value += ["[]"]
return t
else:
pass
def t_func_FUNCEND(t):
r"\)"
t.lexer.pop_state()
return t
def t_comment(t):
r"(dnl|\#).*\n"
t.lexer.lineno += t.value.count('\n')
pass
def t_ECHO(t):
r"echo.*\n"
t.lexer.lineno += t.value.count('\n')
return t
def t_VAR(t):
r"[a-zA-Z_][a-zA-Z0-9_]*=([^;\\\n]|\\\n)*\n"
t.lexer.lineno += t.value.count('\n')
return t
def t_IF(t):
r"if"
t.lexer.push_state("if")
return t
def t_ELIF(t):
r"elif"
t.lexer.push_state("if")
return t
def t_if_THEN(t):
r"then"
t.lexer.pop_state()
return t
def t_if_IFCOM(t):
r"[^ \t\n]+"
return t
def t_ELSE(t):
r"else"
return t
def t_IFEND(t):
r"fi"
return t
def t_CASE(t):
r"case.*in"
t.lexer.push_state("case")
return t
def t_CASEEND(t):
r"esac"
t.lexer.pop_state()
return t
def t_case_CASEOPT(t):
r"[^\n\t\(\)]+\)"
return t
def t_case_COPTEND(t):
r";;"
return t
def t_literal(t):
r"\\[^\n]"
t.type = "TEXT"
t.value = t.value[-1] #return litral char
return t
def t_TEXT(t): #most likely commands like "AM_INIT_AUTOMAKE" etc.
r"[^ ;\t\n\(\)]+"
return t
def t_ANY_error(t):
print("Illegal character '%s'" % t.value[0],t.lexer.lineno)
t.lexer.skip(1)
lexer = lex.lex()
#lexer.input(acfile)
#for tok in lexer:
# print(tok)
#YACC stuff begins here
def p_complst(p):
"""
complst : complst TEXT
| complst ECHO
| complst func
| complst VAR
| complst ifcomp
| complst case
| TEXT
| ECHO
| func
| VAR
| ifcomp
| case
"""
if len(p) == 3:
p[0] = p[1] + [p[2]]
else:
p[0] = [p[1]]
def p_case(p):
"""
case : CASE caseopt CASEEND
"""
p[0] = [p[1]] + [p[2]]
def p_caseopt(p):
"""
caseopt : caseopt CASEOPT complst COPTEND
| CASEOPT complst COPTEND
"""
if len(p) == 5:
p[0] = p[1] + [p[2], p[3]]
else:
p[0] = [p[1], p[2]]
def p_caseopt2(p):
"""
caseopt : caseopt CASEOPT complst
| caseopt CASEOPT COPTEND
| CASEOPT complst
| CASEOPT COPTEND
"""
if len(p) == 4:
if isinstance(p[3],list):
p[0] = p[1] + [p[2], p[3]]
else:
p[0] = p[1] + [p[2], []]
else:
if isinstance(p[2],list):
p[0] = [p[1], p[2]]
else:
p[0] = [p[1], []]
def p_ifcomp(p): #perhaps needs elif also
"""
ifcomp : if IFEND
"""
p[0] = p[1]
def p_if(p):
"""
if : if ELSE complst
| IF ifcom THEN complst
| if ELIF ifcom THEN complst
"""
if len(p) == 5:
p[0] = [[p[1]] + [p[2]], p[4]]
elif len(p) == 6:
p[0] = p[1] + [[p[2]] + [p[3]], p[5]]
else:
p[0] = p[1] + [[p[2]], p[3]]
def p_ifcom(p):
"""
ifcom : ifcom IFCOM
| IFCOM
"""
if len(p) == 3:
p[0] = p[1] + [p[2]]
else:
p[0] = [p[1]]
def p_func(p):
"""
func : FUNC funcopt FUNCEND
"""
p[0] = [p[1],p[2]]
def p_funcopt3(p):
"""
funcopt : funcopt func
"""
p[0] = p[1] + [p[2]]
def p_funcopt2(p):
"""
funcopt : func funcopt
"""
p[0] = [p[1]] + p[2]
def p_funcopt(p):
"""
funcopt : funcopt FUNCOPT
| FUNCOPT
"""
if len(p) == 3:
if isinstance(p[2], list):
p[0] = p[1] + p[2]
else:
p[0] = p[1] + [p[2]]
elif isinstance(p[1], list):
p[0] = p[1]
else:
p[0] = [p[1]]
def p_error(p):
print("syntax error at '%s'" % p.type,p.value)
pass
yacc.yacc()
items = yacc.parse(acfile)
for item in items:
print(item)
file="configure.in"
with open(file, encoding="utf-8", errors="replace") as inputfile:
scanacfile(inputfile.read())
|
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