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441
lib/mako/lexer.py
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441
lib/mako/lexer.py
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# mako/lexer.py
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# Copyright (C) 2006-2015 the Mako authors and contributors <see AUTHORS file>
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#
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# This module is part of Mako and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""provides the Lexer class for parsing template strings into parse trees."""
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import re
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import codecs
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from mako import parsetree, exceptions, compat
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from mako.pygen import adjust_whitespace
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_regexp_cache = {}
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class Lexer(object):
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def __init__(self, text, filename=None,
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disable_unicode=False,
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input_encoding=None, preprocessor=None):
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self.text = text
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self.filename = filename
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self.template = parsetree.TemplateNode(self.filename)
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self.matched_lineno = 1
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self.matched_charpos = 0
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self.lineno = 1
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self.match_position = 0
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self.tag = []
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self.control_line = []
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self.ternary_stack = []
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self.disable_unicode = disable_unicode
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self.encoding = input_encoding
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if compat.py3k and disable_unicode:
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raise exceptions.UnsupportedError(
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"Mako for Python 3 does not "
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"support disabling Unicode")
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if preprocessor is None:
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self.preprocessor = []
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elif not hasattr(preprocessor, '__iter__'):
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self.preprocessor = [preprocessor]
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else:
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self.preprocessor = preprocessor
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@property
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def exception_kwargs(self):
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return {'source': self.text,
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'lineno': self.matched_lineno,
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'pos': self.matched_charpos,
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'filename': self.filename}
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def match(self, regexp, flags=None):
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"""compile the given regexp, cache the reg, and call match_reg()."""
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try:
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reg = _regexp_cache[(regexp, flags)]
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except KeyError:
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if flags:
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reg = re.compile(regexp, flags)
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else:
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reg = re.compile(regexp)
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_regexp_cache[(regexp, flags)] = reg
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return self.match_reg(reg)
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def match_reg(self, reg):
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"""match the given regular expression object to the current text
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position.
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if a match occurs, update the current text and line position.
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"""
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mp = self.match_position
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match = reg.match(self.text, self.match_position)
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if match:
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(start, end) = match.span()
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if end == start:
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self.match_position = end + 1
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else:
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self.match_position = end
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self.matched_lineno = self.lineno
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lines = re.findall(r"\n", self.text[mp:self.match_position])
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cp = mp - 1
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while (cp >= 0 and cp < self.textlength and self.text[cp] != '\n'):
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cp -= 1
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self.matched_charpos = mp - cp
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self.lineno += len(lines)
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#print "MATCHED:", match.group(0), "LINE START:",
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# self.matched_lineno, "LINE END:", self.lineno
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#print "MATCH:", regexp, "\n", self.text[mp : mp + 15], \
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# (match and "TRUE" or "FALSE")
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return match
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def parse_until_text(self, *text):
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startpos = self.match_position
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text_re = r'|'.join(text)
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brace_level = 0
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while True:
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match = self.match(r'#.*\n')
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if match:
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continue
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match = self.match(r'(\"\"\"|\'\'\'|\"|\')((?<!\\)\\\1|.)*?\1',
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re.S)
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if match:
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continue
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match = self.match(r'(%s)' % text_re)
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if match:
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if match.group(1) == '}' and brace_level > 0:
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brace_level -= 1
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continue
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return \
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self.text[startpos:
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self.match_position - len(match.group(1))],\
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match.group(1)
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match = self.match(r"(.*?)(?=\"|\'|#|%s)" % text_re, re.S)
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if match:
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brace_level += match.group(1).count('{')
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brace_level -= match.group(1).count('}')
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continue
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raise exceptions.SyntaxException(
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"Expected: %s" %
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','.join(text),
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**self.exception_kwargs)
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def append_node(self, nodecls, *args, **kwargs):
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kwargs.setdefault('source', self.text)
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kwargs.setdefault('lineno', self.matched_lineno)
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kwargs.setdefault('pos', self.matched_charpos)
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kwargs['filename'] = self.filename
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node = nodecls(*args, **kwargs)
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if len(self.tag):
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self.tag[-1].nodes.append(node)
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else:
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self.template.nodes.append(node)
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# build a set of child nodes for the control line
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# (used for loop variable detection)
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# also build a set of child nodes on ternary control lines
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# (used for determining if a pass needs to be auto-inserted
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if self.control_line:
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control_frame = self.control_line[-1]
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control_frame.nodes.append(node)
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if not (isinstance(node, parsetree.ControlLine) and
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control_frame.is_ternary(node.keyword)):
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if self.ternary_stack and self.ternary_stack[-1]:
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self.ternary_stack[-1][-1].nodes.append(node)
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if isinstance(node, parsetree.Tag):
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if len(self.tag):
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node.parent = self.tag[-1]
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self.tag.append(node)
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elif isinstance(node, parsetree.ControlLine):
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if node.isend:
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self.control_line.pop()
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self.ternary_stack.pop()
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elif node.is_primary:
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self.control_line.append(node)
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self.ternary_stack.append([])
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elif self.control_line and \
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self.control_line[-1].is_ternary(node.keyword):
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self.ternary_stack[-1].append(node)
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elif self.control_line and \
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not self.control_line[-1].is_ternary(node.keyword):
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raise exceptions.SyntaxException(
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"Keyword '%s' not a legal ternary for keyword '%s'" %
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(node.keyword, self.control_line[-1].keyword),
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**self.exception_kwargs)
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_coding_re = re.compile(r'#.*coding[:=]\s*([-\w.]+).*\r?\n')
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def decode_raw_stream(self, text, decode_raw, known_encoding, filename):
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"""given string/unicode or bytes/string, determine encoding
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from magic encoding comment, return body as unicode
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or raw if decode_raw=False
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"""
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if isinstance(text, compat.text_type):
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m = self._coding_re.match(text)
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encoding = m and m.group(1) or known_encoding or 'ascii'
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return encoding, text
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if text.startswith(codecs.BOM_UTF8):
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text = text[len(codecs.BOM_UTF8):]
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parsed_encoding = 'utf-8'
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m = self._coding_re.match(text.decode('utf-8', 'ignore'))
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if m is not None and m.group(1) != 'utf-8':
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raise exceptions.CompileException(
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"Found utf-8 BOM in file, with conflicting "
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"magic encoding comment of '%s'" % m.group(1),
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text.decode('utf-8', 'ignore'),
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0, 0, filename)
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else:
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m = self._coding_re.match(text.decode('utf-8', 'ignore'))
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if m:
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parsed_encoding = m.group(1)
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else:
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parsed_encoding = known_encoding or 'ascii'
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if decode_raw:
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try:
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text = text.decode(parsed_encoding)
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except UnicodeDecodeError:
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raise exceptions.CompileException(
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"Unicode decode operation of encoding '%s' failed" %
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parsed_encoding,
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text.decode('utf-8', 'ignore'),
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0, 0, filename)
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return parsed_encoding, text
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def parse(self):
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self.encoding, self.text = self.decode_raw_stream(self.text,
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not self.disable_unicode,
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self.encoding,
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self.filename,)
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for preproc in self.preprocessor:
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self.text = preproc(self.text)
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# push the match marker past the
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# encoding comment.
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self.match_reg(self._coding_re)
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self.textlength = len(self.text)
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while (True):
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if self.match_position > self.textlength:
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break
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if self.match_end():
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break
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if self.match_expression():
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continue
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if self.match_control_line():
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continue
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if self.match_comment():
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continue
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if self.match_tag_start():
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continue
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if self.match_tag_end():
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continue
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if self.match_python_block():
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continue
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if self.match_text():
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continue
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if self.match_position > self.textlength:
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break
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raise exceptions.CompileException("assertion failed")
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if len(self.tag):
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raise exceptions.SyntaxException("Unclosed tag: <%%%s>" %
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self.tag[-1].keyword,
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**self.exception_kwargs)
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if len(self.control_line):
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raise exceptions.SyntaxException(
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"Unterminated control keyword: '%s'" %
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self.control_line[-1].keyword,
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self.text,
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self.control_line[-1].lineno,
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self.control_line[-1].pos, self.filename)
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return self.template
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def match_tag_start(self):
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match = self.match(r'''
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\<% # opening tag
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([\w\.\:]+) # keyword
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((?:\s+\w+|\s*=\s*|".*?"|'.*?')*) # attrname, = \
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# sign, string expression
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\s* # more whitespace
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(/)?> # closing
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''',
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re.I | re.S | re.X)
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if match:
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keyword, attr, isend = match.groups()
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self.keyword = keyword
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attributes = {}
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if attr:
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for att in re.findall(
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r"\s*(\w+)\s*=\s*(?:'([^']*)'|\"([^\"]*)\")", attr):
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key, val1, val2 = att
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text = val1 or val2
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text = text.replace('\r\n', '\n')
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attributes[key] = text
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self.append_node(parsetree.Tag, keyword, attributes)
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if isend:
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self.tag.pop()
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else:
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if keyword == 'text':
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match = self.match(r'(.*?)(?=\</%text>)', re.S)
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if not match:
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raise exceptions.SyntaxException(
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"Unclosed tag: <%%%s>" %
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self.tag[-1].keyword,
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**self.exception_kwargs)
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self.append_node(parsetree.Text, match.group(1))
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return self.match_tag_end()
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return True
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else:
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return False
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def match_tag_end(self):
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match = self.match(r'\</%[\t ]*(.+?)[\t ]*>')
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if match:
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if not len(self.tag):
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raise exceptions.SyntaxException(
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"Closing tag without opening tag: </%%%s>" %
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match.group(1),
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**self.exception_kwargs)
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elif self.tag[-1].keyword != match.group(1):
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raise exceptions.SyntaxException(
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"Closing tag </%%%s> does not match tag: <%%%s>" %
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(match.group(1), self.tag[-1].keyword),
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**self.exception_kwargs)
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self.tag.pop()
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return True
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else:
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return False
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def match_end(self):
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match = self.match(r'\Z', re.S)
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if match:
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string = match.group()
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if string:
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return string
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else:
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return True
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else:
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return False
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def match_text(self):
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match = self.match(r"""
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(.*?) # anything, followed by:
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(
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(?<=\n)(?=[ \t]*(?=%|\#\#)) # an eval or line-based
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# comment preceded by a
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# consumed newline and whitespace
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|
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(?=\${) # an expression
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(?=</?[%&]) # a substitution or block or call start or end
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# - don't consume
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|
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(\\\r?\n) # an escaped newline - throw away
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|
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\Z # end of string
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)""", re.X | re.S)
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if match:
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text = match.group(1)
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if text:
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self.append_node(parsetree.Text, text)
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return True
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else:
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return False
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def match_python_block(self):
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match = self.match(r"<%(!)?")
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if match:
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line, pos = self.matched_lineno, self.matched_charpos
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text, end = self.parse_until_text(r'%>')
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# the trailing newline helps
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# compiler.parse() not complain about indentation
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text = adjust_whitespace(text) + "\n"
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self.append_node(
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parsetree.Code,
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text,
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match.group(1) == '!', lineno=line, pos=pos)
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return True
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else:
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return False
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def match_expression(self):
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match = self.match(r"\${")
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if match:
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line, pos = self.matched_lineno, self.matched_charpos
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text, end = self.parse_until_text(r'\|', r'}')
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if end == '|':
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escapes, end = self.parse_until_text(r'}')
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else:
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escapes = ""
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text = text.replace('\r\n', '\n')
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self.append_node(
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parsetree.Expression,
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text, escapes.strip(),
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lineno=line, pos=pos)
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return True
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else:
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return False
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def match_control_line(self):
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match = self.match(
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r"(?<=^)[\t ]*(%(?!%)|##)[\t ]*((?:(?:\\r?\n)|[^\r\n])*)"
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r"(?:\r?\n|\Z)", re.M)
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if match:
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operator = match.group(1)
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text = match.group(2)
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if operator == '%':
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m2 = re.match(r'(end)?(\w+)\s*(.*)', text)
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if not m2:
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raise exceptions.SyntaxException(
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"Invalid control line: '%s'" %
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text,
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**self.exception_kwargs)
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isend, keyword = m2.group(1, 2)
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isend = (isend is not None)
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if isend:
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if not len(self.control_line):
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raise exceptions.SyntaxException(
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"No starting keyword '%s' for '%s'" %
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(keyword, text),
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**self.exception_kwargs)
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elif self.control_line[-1].keyword != keyword:
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raise exceptions.SyntaxException(
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"Keyword '%s' doesn't match keyword '%s'" %
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(text, self.control_line[-1].keyword),
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**self.exception_kwargs)
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self.append_node(parsetree.ControlLine, keyword, isend, text)
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else:
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self.append_node(parsetree.Comment, text)
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return True
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else:
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return False
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def match_comment(self):
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"""matches the multiline version of a comment"""
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match = self.match(r"<%doc>(.*?)</%doc>", re.S)
|
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if match:
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self.append_node(parsetree.Comment, match.group(1))
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return True
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else:
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return False
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|
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