def parse_expression(text, start_pos=0):
if text[start_pos + 1] != '{':
return parse_unenclosed_expression(text, start_pos)
lex = JsLexer()
braces = 0
length = 2
valid = False
tokens = lex.lex(text, start_pos + 2)
for type, content in tokens:
if content == '}':
if braces <= 0:
length += 1
valid = True
break
braces -= 1
if content == '{':
braces += 1
length += len(content)
if not valid:
raise ParseError("Unclosed braced Javascript expression", charpos=length)
return JavascriptExpression(text[start_pos:start_pos + length],
text[start_pos + 2: start_pos + length - 1])
def parse_unenclosed_expression(text, start_pos):
m = identifier_match.match(text, start_pos + 1)
pos = m.end(0)
pars = []
while True:
m = expr_continuation.match(text, pos)
if not m:
break
# it was a dotted part; continue
if m.group(1):
pos = m.end(0)
continue
lex = JsLexer()
# a braced expression is started, consume it
for type, content in lex.lex(text, pos):
pos += len(content)
if content in braces:
pars.append(content)
elif content in braces.values():
last = pars.pop()
if braces[last] != content:
raise TemplateSyntaxError(
"Syntax error parsing interpolated expression",
node=text[pos-1:])
if not pars:
break
expr = text[start_pos + 1:pos]
return JavascriptExpression('$' + expr, expr)
def parse_unenclosed_expression(text, start_pos):
m = identifier_match.match(text, start_pos + 1)
pos = m.end(0)
pars = []
while True:
m = expr_continuation.match(text, pos)
if not m:
break
# it was a dotted part; continue
if m.group(1):
pos = m.end(0)
continue
lex = JsLexer()
# a braced expression is started, consume it
for type, content in lex.lex(text, pos):
pos += len(content)
if content in braces:
pars.append(content)
elif content in braces.values():
last = pars.pop()
if braces[last] != content:
raise TemplateSyntaxError(
"Syntax error parsing interpolated expression",
node=text[pos - 1:])
if not pars:
break
expr = text[start_pos + 1:pos]
return JavascriptExpression('$' + expr, expr)
def parse_expression(text, start_pos=0):
if text[start_pos + 1] != '{':
return parse_unenclosed_expression(text, start_pos)
lex = JsLexer()
braces = 0
length = 2
valid = False
tokens = lex.lex(text, start_pos + 2)
for type, content in tokens:
if content == '}':
if braces <= 0:
length += 1
valid = True
break
braces -= 1
if content == '{':
braces += 1
length += len(content)
if not valid:
raise ParseError("Unclosed braced Javascript expression",
charpos=length)
return JavascriptExpression(text[start_pos:start_pos + length],
text[start_pos + 2: start_pos + length - 1])
def parse_expression(text, start_pos=0):
lex = JsLexer()
nodes = []
if text[start_pos + 1] != '{':
m = identifier_match.match(text, start_pos + 1)
identifier = m.group(0)
return JavascriptExpression('$' + identifier, identifier, [('id', identifier)])
braces = 0
length = 2
valid = False
tokens = lex.lex(text, start_pos + 2)
for type, content in tokens:
if content == '}':
if braces <= 0:
length += 1
valid = True
break
braces -= 1
if content == '{':
braces += 1
length += len(content)
nodes.append((type, content))
if not valid:
raise ParseError("Not finished javascript expression", charpos=length)
return JavascriptExpression(text[start_pos:start_pos + length], text[start_pos + 2: start_pos + length - 1], nodes)
