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# lexer.py
# Copyright (C) 2006 Michael Bayer mike_mp@zzzcomputing.com
#
# This module is part of Mako and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""provides the Lexer class for parsing template strings into parse trees."""
import re
from mako import parsetree, exceptions
from mako.pygen import adjust_whitespace
class Lexer(object):
def __init__(self, text, filename=None):
self.text = text
self.filename = filename
self.template = parsetree.TemplateNode(self.filename)
self.matched_lineno = 1
self.matched_charpos = 0
self.lineno = 1
self.match_position = 0
self.tag = []
self.control_line = []
def match(self, regexp, flags=None):
"""match the given regular expression string and flags to the current text position.
if a match occurs, update the current text and line position."""
mp = self.match_position
if flags:
reg = re.compile(regexp, flags)
else:
reg = re.compile(regexp)
match = reg.match(self.text, self.match_position)
if match:
(start, end) = match.span()
if end == start:
self.match_position = end + 1
else:
self.match_position = end
self.matched_lineno = self.lineno
lines = re.findall(r"\n", self.text[mp:self.match_position])
cp = mp - 1
while (cp >= 0 and cp<len(self.text) and self.text[cp] != '\n'):
cp -=1
self.matched_charpos = mp - cp
self.lineno += len(lines)
#print "MATCHED:", match.group(0), "LINE START:", self.matched_lineno, "LINE END:", self.lineno
#print "MATCH:", regexp, "\n", self.text[mp : mp + 15], (match and "TRUE" or "FALSE")
return match
def append_node(self, nodecls, *args, **kwargs):
kwargs['lineno'] = self.matched_lineno
kwargs['pos'] = self.matched_charpos
kwargs['filename'] = self.filename
node = nodecls(*args, **kwargs)
if len(self.tag):
self.tag[-1].nodes.append(node)
else:
self.template.nodes.append(node)
if isinstance(node, parsetree.Tag):
if len(self.tag):
node.parent = self.tag[-1]
self.tag.append(node)
elif isinstance(node, parsetree.ControlLine):
if node.isend:
self.control_line.pop()
elif node.is_primary:
self.control_line.append(node)
elif len(self.control_line) and not self.control_line[-1].is_ternary(node.keyword):
raise exceptions.SyntaxException("Keyword '%s' not a legal ternary for keyword '%s'" % (node.keyword, self.control_line[-1].keyword), self.matched_lineno, self.matched_charpos, self.filename)
def parse(self):
length = len(self.text)
while (True):
if self.match_position > length:
break
if self.match_end():
break
if self.match_expression():
continue
if self.match_control_line():
continue
if self.match_tag_start():
continue
if self.match_tag_end():
continue
if self.match_python_block():
continue
if self.match_text():
continue
if (self.current.match_position > len(self.current.source)):
break
raise "assertion failed"
if len(self.tag):
raise exceptions.SyntaxException("Unclosed tag: <%%%s>" % self.tag[-1].keyword, self.matched_lineno, self.matched_charpos, self.filename)
return self.template
def match_tag_start(self):
match = self.match(r'''
\<% # opening tag
(\w+) # keyword
((?:\s+\w+|=|".*?"|'.*?')*) # attrname, = sign, string expression
\s* # more whitespace
(/)?> # closing
''',
re.I | re.S | re.X)
if match:
(keyword, attr, isend) = (match.group(1).lower(), match.group(2), match.group(3))
self.keyword = keyword
attributes = {}
if attr:
for att in re.findall(r"\s*(\w+)\s*=\s*(?:'([^']*)'|\"([^\"]*)\")", attr):
(key, val1, val2) = att
attributes[key] = val1 or val2
self.append_node(parsetree.Tag, keyword, attributes)
if isend:
self.tag.pop()
else:
if keyword == 'text':
match = self.match(r'(.*?)(?=\</%text>)', re.S)
if not match:
raise exceptions.SyntaxException("Unclosed tag: <%%%s>" % self.tag[-1].keyword, self.matched_lineno, self.matched_charpos, self.filename)
self.append_node(parsetree.Text, match.group(1))
return self.match_tag_end()
return True
else:
return False
def match_tag_end(self):
match = self.match(r'\</%\s*(.+?)\s*>')
if match:
if not len(self.tag):
raise exceptions.SyntaxException("Closing tag without opening tag: </%%%s>" % match.group(1), self.matched_lineno, self.matched_charpos, self.filename)
elif self.tag[-1].keyword != match.group(1):
raise exceptions.SyntaxException("Closing tag </%%%s> does not match tag: <%%%s>" % (match.group(1), self.tag[-1].keyword), self.matched_lineno, self.matched_charpos, self.filename)
self.tag.pop()
return True
else:
return False
def match_end(self):
match = self.match(r'\Z', re.S)
if match:
string = match.group()
if string:
return string
else:
return True
else:
return False
def match_text(self):
match = self.match(r"""
(.*?) # anything, followed by:
(
(?<=\n)(?=\s*[%#]) # an eval or comment line, preceded by a consumed \n and whitespace
|
(?=\${) # an expression
|
(?=</?[%&]) # a substitution or block or call start or end
# - don't consume
|
(\\\n) # an escaped newline - throw away
|
\Z # end of string
)""", re.X | re.S)
if match:
text = match.group(1)
self.append_node(parsetree.Text, text)
return True
else:
return False
def match_python_block(self):
match = self.match(r"<%(!)?(.*?)%>", re.S)
if match:
text = adjust_whitespace(match.group(2))
self.append_node(parsetree.Code, text, match.group(1)=='!')
return True
else:
return False
def match_expression(self):
match = self.match(r"\${(.+?)(?:\|\s*([^\|]+?)\s*)?}", re.S)
if match:
escapes = match.group(2)
self.append_node(parsetree.Expression, match.group(1), escapes or "")
return True
else:
return False
def match_control_line(self):
match = self.match(r"(?<=^)\s*([%#])\s*([^\n]*)(?:\n|\Z)", re.M)
if match:
operator = match.group(1)
text = match.group(2)
if operator == '%':
m2 = re.match(r'(end)?(\w+)\s*(.*)', text)
if not m2:
raise exceptions.SyntaxException("Invalid control line: '%s'" % text, self.matched_lineno, self.matched_charpos, self.filename)
(isend, keyword) = m2.group(1, 2)
isend = (isend is not None)
if isend:
if not len(self.control_line):
raise exceptions.SyntaxException("No starting keyword '%s' for '%s'" % (keyword, text), self.matched_lineno, self.matched_charpos, self.filename)
elif self.control_line[-1].keyword != keyword:
raise exceptions.SyntaxException("Keyword '%s' doesn't match keyword '%s'" % (text, self.control_line[-1].keyword), self.matched_lineno, self.matched_charpos, self.filename)
self.append_node(parsetree.ControlLine, keyword, isend, text)
else:
self.append_node(parsetree.Comment, text)
return True
else:
return False
def _count_lines(self, text):
return len(re.findall(r"\n", text))
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