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from Cython.Compiler.Visitor import TreeVisitor
from Cython.Compiler.Nodes import *
"""
Serializes a Cython code tree to Cython code. This is primarily useful for
debugging and testing purposes.
The output is in a strict format, no whitespace or comments from the input
is preserved (and it could not be as it is not present in the code tree).
"""
class LinesResult(object):
def __init__(self):
self.lines = []
self.s = u""
def put(self, s):
self.s += s
def newline(self):
self.lines.append(self.s)
self.s = u""
def putline(self, s):
self.put(s)
self.newline()
class CodeWriter(TreeVisitor):
indent_string = u" "
def __init__(self, result = None):
super(CodeWriter, self).__init__()
if result is None:
result = LinesResult()
self.result = result
self.numindents = 0
def write(self, tree):
self.visit(tree)
def indent(self):
self.numindents += 1
def dedent(self):
self.numindents -= 1
def startline(self, s = u""):
self.result.put(self.indent_string * self.numindents + s)
def put(self, s):
self.result.put(s)
def endline(self, s = u""):
self.result.putline(s)
def line(self, s):
self.startline(s)
self.endline()
def comma_seperated_list(self, items, output_rhs=False):
if len(items) > 0:
for item in items[:-1]:
self.visit(item)
if output_rhs and item.rhs is not None:
self.put(u" = ")
self.visit(item.rhs)
self.put(u", ")
self.visit(items[-1])
def visit_Node(self, node):
raise AssertionError("Node not handled by serializer: %r" % node)
def visit_ModuleNode(self, node):
self.visitchildren(node)
def visit_StatListNode(self, node):
self.visitchildren(node)
def visit_FuncDefNode(self, node):
self.startline(u"def %s(" % node.name)
self.comma_seperated_list(node.args)
self.endline(u"):")
self.indent()
self.visit(node.body)
self.dedent()
def visit_CArgDeclNode(self, node):
if node.base_type.name is not None:
self.visit(node.base_type)
self.put(u" ")
self.visit(node.declarator)
if node.default is not None:
self.put(u" = ")
self.visit(node.default)
def visit_CNameDeclaratorNode(self, node):
self.put(node.name)
def visit_CSimpleBaseTypeNode(self, node):
# See Parsing.p_sign_and_longness
if node.is_basic_c_type:
self.put(("unsigned ", "", "signed ")[node.signed])
if node.longness < 0:
self.put("short " * -node.longness)
elif node.longness > 0:
self.put("long " * node.longness)
self.put(node.name)
def visit_SingleAssignmentNode(self, node):
self.startline()
self.visit(node.lhs)
self.put(u" = ")
self.visit(node.rhs)
self.endline()
def visit_NameNode(self, node):
self.put(node.name)
def visit_IntNode(self, node):
self.put(node.value)
def visit_IfStatNode(self, node):
# The IfClauseNode is handled directly without a seperate match
# for clariy.
self.startline(u"if ")
self.visit(node.if_clauses[0].condition)
self.endline(":")
self.indent()
self.visit(node.if_clauses[0].body)
self.dedent()
for clause in node.if_clauses[1:]:
self.startline("elif ")
self.visit(clause.condition)
self.endline(":")
self.indent()
self.visit(clause.body)
self.dedent()
if node.else_clause is not None:
self.line("else:")
self.indent()
self.visit(node.else_clause)
self.dedent()
def visit_PassStatNode(self, node):
self.startline(u"pass")
self.endline()
def visit_PrintStatNode(self, node):
self.startline(u"print ")
self.comma_seperated_list(node.arg_tuple.args)
if not node.append_newline:
self.put(u",")
self.endline()
def visit_BinopNode(self, node):
self.visit(node.operand1)
self.put(u" %s " % node.operator)
self.visit(node.operand2)
def visit_CVarDefNode(self, node):
self.startline(u"cdef ")
self.visit(node.base_type)
self.put(u" ")
self.comma_seperated_list(node.declarators, output_rhs=True)
self.endline()
def visit_ForInStatNode(self, node):
self.startline(u"for ")
self.visit(node.target)
self.put(u" in ")
self.visit(node.iterator.sequence)
self.endline(u":")
self.indent()
self.visit(node.body)
self.dedent()
if node.else_clause is not None:
self.line(u"else:")
self.indent()
self.visit(node.else_clause)
self.dedent()
def visit_SequenceNode(self, node):
self.comma_seperated_list(node.args) # Might need to discover whether we need () around tuples...hmm...
def visit_SimpleCallNode(self, node):
self.put(node.function.name + u"(")
self.comma_seperated_list(node.args)
self.put(")")
def visit_ExprStatNode(self, node):
self.startline()
self.visit(node.expr)
self.endline()
def visit_InPlaceAssignmentNode(self, node):
self.startline()
self.visit(node.lhs)
self.put(" %s= " % node.operator)
self.visit(node.rhs)
self.endline()
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