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-rw-r--r--docs/examples/inline_gettext_extension.py72
1 files changed, 72 insertions, 0 deletions
diff --git a/docs/examples/inline_gettext_extension.py b/docs/examples/inline_gettext_extension.py
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+++ b/docs/examples/inline_gettext_extension.py
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+import re
+
+from jinja2.exceptions import TemplateSyntaxError
+from jinja2.ext import Extension
+from jinja2.lexer import count_newlines
+from jinja2.lexer import Token
+
+
+_outside_re = re.compile(r"\\?(gettext|_)\(")
+_inside_re = re.compile(r"\\?[()]")
+
+
+class InlineGettext(Extension):
+ """This extension implements support for inline gettext blocks::
+
+ <h1>_(Welcome)</h1>
+ <p>_(This is a paragraph)</p>
+
+ Requires the i18n extension to be loaded and configured.
+ """
+
+ def filter_stream(self, stream):
+ paren_stack = 0
+
+ for token in stream:
+ if token.type != "data":
+ yield token
+ continue
+
+ pos = 0
+ lineno = token.lineno
+
+ while True:
+ if not paren_stack:
+ match = _outside_re.search(token.value, pos)
+ else:
+ match = _inside_re.search(token.value, pos)
+ if match is None:
+ break
+ new_pos = match.start()
+ if new_pos > pos:
+ preval = token.value[pos:new_pos]
+ yield Token(lineno, "data", preval)
+ lineno += count_newlines(preval)
+ gtok = match.group()
+ if gtok[0] == "\\":
+ yield Token(lineno, "data", gtok[1:])
+ elif not paren_stack:
+ yield Token(lineno, "block_begin", None)
+ yield Token(lineno, "name", "trans")
+ yield Token(lineno, "block_end", None)
+ paren_stack = 1
+ else:
+ if gtok == "(" or paren_stack > 1:
+ yield Token(lineno, "data", gtok)
+ paren_stack += -1 if gtok == ")" else 1
+ if not paren_stack:
+ yield Token(lineno, "block_begin", None)
+ yield Token(lineno, "name", "endtrans")
+ yield Token(lineno, "block_end", None)
+ pos = match.end()
+
+ if pos < len(token.value):
+ yield Token(lineno, "data", token.value[pos:])
+
+ if paren_stack:
+ raise TemplateSyntaxError(
+ "unclosed gettext expression",
+ token.lineno,
+ stream.name,
+ stream.filename,
+ )