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jinja2cpp.py
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jinja2cpp.py
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import sys
import re
import jinja2
import jinja2.meta
from jinja2 import nodes
from jinja2.nodes import *
from jinja2.compiler import CodeGenerator, CompilerExit, Frame
from jinja2.ext import Extension
class ArgStmtExtension(Extension):
tags = set(['arg'])
def parse(self, parser):
token = next(parser.stream)
tokens = []
while parser.stream.current.type != 'block_end':
tokens.append(next(parser.stream).value)
# print tokens
node = parser.free_identifier(lineno=token.lineno)
node.name = ("".join(tokens[:-1]).encode("utf8"), tokens[-1])
return node
class MyCodeGenerator(CodeGenerator):
def __init__(self, *args, **kwargs):
CodeGenerator.__init__(self, *args, **kwargs)
self.args = {}
self.prototype = None
def visit_Template(self, node, frame=None):
self.writeline('#include "microweb.hpp"')
#self.writeline("using namespace std;")
self.writeline("")
self.prototype = "void %s(ostream& out" % self.name
comma = True
for argnode in node.find_all(InternalName):
type, name = argnode.name
self.args[name] = type
if comma:
self.prototype += ", "
self.prototype += "const " + type + "& " + name
comma = True
self.prototype += ")"
self.writeline(self.prototype)
have_extends = node.find(nodes.Extends) is not None
eval_ctx = EvalContext(self.environment, self.name)
frame = Frame(eval_ctx)
frame.inspect(node.body)
frame.toplevel = frame.rootlevel = True
frame.require_output_check = have_extends and not self.has_known_extends
self.writeline("{")
self.indent()
self.blockvisit(node.body, frame)
self.outdent()
self.writeline("}")
self.writeline("")
def visit_For(self, node, frame):
# print node
iter_var = node.target.name
seq_var = node.iter.name
seq_type = self.args[seq_var]
seq_container, item_type = self.parse_container_type(seq_type)
self.writeline("for (const %s& %s: %s) {" % (item_type, iter_var, seq_var))
self.indent()
self.blockvisit(node.body, frame)
self.outdent()
self.writeline("}")
# print list(node.iter_child_nodes())
def visit_Output(self, node, frame):
body = []
for child in node.nodes:
try:
const = child.as_const(frame.eval_ctx)
body.append(const)
except:
body.append(child)
self.writeline("out")
for item in body:
self.write(" << ")
if type(item) == type(u""):
self.write(self.c_string(item))
else:
self.visit(item, frame)
self.write(";")
def visit_Call(self, node, frame, forward_caller=False):
self.visit(node.node, frame)
self.write('(')
extra_kwargs = forward_caller and {'caller': 'caller'} or None
self.signature(node, frame, extra_kwargs)
self.write(')')
def visit_Getattr(self, node, frame):
self.visit(node.node, frame)
self.write("." + node.attr)
def visit_Getitem(self, node, frame):
self.visit(node.node, frame)
self.write("[")
self.visit(node.arg, frame)
self.write("]")
def visit_TemplateData(self, node, frame):
# self.write(repr(node.as_const(frame.eval_ctx)))
1 / 0
print "hello"
return "!!!!!!!!!!!!!!!"
def visit_Name(self, node, frame):
if node.ctx == 'store' and frame.toplevel:
frame.toplevel_assignments.add(node.name)
self.write(node.name)
frame.assigned_names.add(node.name)
def visit_InternalName(self, node, frame):
# type, name = node.name
# self.args[name] = type
# print self.args
pass
def visit_Const(self, node, frame):
val = node.value
if isinstance(val, str):
self.write(self.c_string(val))
else:
self.write(repr(val))
def signature(self, node, frame, extra_kwargs=None):
comma = False
for arg in node.args:
if comma:
self.write(', ')
self.visit(arg, frame)
comma = True
def blockvisit(self, nodes, frame):
try:
for node in nodes:
self.visit(node, frame)
except CompilerExit:
pass
def c_string(self, s):
s = repr(s.encode("utf8"))
s = s[1:-1]
s = s.replace('"', '\\"')
return '"' + s + '"'
def parse_container_type(self, type):
m = re.match(r"(.+)<(.+)>$", type)
assert m
return m.group(1), m.group(2)
# def write(self, sth):
# sys.stdout.write(sth)
env = jinja2.Environment(extensions=[ArgStmtExtension])
tpl = open(sys.argv[1])
ast = env.parse(tpl.read())
#print ast
tpl_name = sys.argv[1].rsplit('.', 1)[0]
# Use underscore to avoid "*.tpl.cpp" being compiled in "*.tpl" "binary"
# and thus overwriting original template
f = open(tpl_name + "_tpl.cpp", "w")
codegen = MyCodeGenerator(ast.environment, tpl_name, sys.argv[1], f)
codegen.visit(ast)
f.close()
f = open(tpl_name + ".tpl.hpp", "w")
f.write(codegen.prototype + ";\n")
f.close()
f = open(sys.argv[1] + ".render", "w")
m = re.match(r".+?\((.+)\)$", codegen.prototype)
args = m.group(1).split(", ")
arg_names = [x.rsplit(" ", 1)[1] for x in args]
f.write('#include "%s"\n' % (sys.argv[1] + ".hpp"));
f.write("%s(%s);\n" % (tpl_name, ", ".join(arg_names)))
f.close()