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mako
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exceptions.py
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# mako/exceptions.py # Copyright 2006-2024 the Mako authors and contributors <see AUTHORS file> # # This module is part of Mako and is released under # the MIT License: http://www.opensource.org/licenses/mit-license.php """exception classes""" import sys import traceback from mako import compat from mako import util class MakoException(Exception): pass class RuntimeException(MakoException): pass def _format_filepos(lineno, pos, filename): if filename is None: return " at line: %d char: %d" % (lineno, pos) else: return " in file '%s' at line: %d char: %d" % (filename, lineno, pos) class CompileException(MakoException): def __init__(self, message, source, lineno, pos, filename): MakoException.__init__( self, message + _format_filepos(lineno, pos, filename) ) self.lineno = lineno self.pos = pos self.filename = filename self.source = source class SyntaxException(MakoException): def __init__(self, message, source, lineno, pos, filename): MakoException.__init__( self, message + _format_filepos(lineno, pos, filename) ) self.lineno = lineno self.pos = pos self.filename = filename self.source = source class UnsupportedError(MakoException): """raised when a retired feature is used.""" class NameConflictError(MakoException): """raised when a reserved word is used inappropriately""" class TemplateLookupException(MakoException): pass class TopLevelLookupException(TemplateLookupException): pass class RichTraceback: """Pull the current exception from the ``sys`` traceback and extracts Mako-specific template information. See the usage examples in :ref:`handling_exceptions`. """ def __init__(self, error=None, traceback=None): self.source, self.lineno = "", 0 if error is None or traceback is None: t, value, tback = sys.exc_info() if error is None: error = value or t if traceback is None: traceback = tback self.error = error self.records = self._init(traceback) if isinstance(self.error, (CompileException, SyntaxException)): self.source = self.error.source self.lineno = self.error.lineno self._has_source = True self._init_message() @property def errorname(self): return compat.exception_name(self.error) def _init_message(self): """Find a unicode representation of self.error""" try: self.message = str(self.error) except UnicodeError: try: self.message = str(self.error) except UnicodeEncodeError: # Fallback to args as neither unicode nor # str(Exception(u'\xe6')) work in Python < 2.6 self.message = self.error.args[0] if not isinstance(self.message, str): self.message = str(self.message, "ascii", "replace") def _get_reformatted_records(self, records): for rec in records: if rec[6] is not None: yield (rec[4], rec[5], rec[2], rec[6]) else: yield tuple(rec[0:4]) @property def traceback(self): """Return a list of 4-tuple traceback records (i.e. normal python format) with template-corresponding lines remapped to the originating template. """ return list(self._get_reformatted_records(self.records)) @property def reverse_records(self): return reversed(self.records) @property def reverse_traceback(self): """Return the same data as traceback, except in reverse order.""" return list(self._get_reformatted_records(self.reverse_records)) def _init(self, trcback): """format a traceback from sys.exc_info() into 7-item tuples, containing the regular four traceback tuple items, plus the original template filename, the line number adjusted relative to the template source, and code line from that line number of the template.""" import mako.template mods = {} rawrecords = traceback.extract_tb(trcback) new_trcback = [] for filename, lineno, function, line in rawrecords: if not line: line = "" try: (line_map, template_lines, template_filename) = mods[filename] except KeyError: try: info = mako.template._get_module_info(filename) module_source = info.code template_source = info.source template_filename = ( info.template_filename or info.template_uri or filename ) except KeyError: # A normal .py file (not a Template) new_trcback.append( ( filename, lineno, function, line, None, None, None, None, ) ) continue template_ln = 1 mtm = mako.template.ModuleInfo source_map = mtm.get_module_source_metadata( module_source, full_line_map=True ) line_map = source_map["full_line_map"] template_lines = [ line_ for line_ in template_source.split("\n") ] mods[filename] = (line_map, template_lines, template_filename) template_ln = line_map[lineno - 1] if template_ln <= len(template_lines): template_line = template_lines[template_ln - 1] else: template_line = None new_trcback.append( ( filename, lineno, function, line, template_filename, template_ln, template_line, template_source, ) ) if not self.source: for l in range(len(new_trcback) - 1, 0, -1): if new_trcback[l][5]: self.source = new_trcback[l][7] self.lineno = new_trcback[l][5] break else: if new_trcback: try: # A normal .py file (not a Template) with open(new_trcback[-1][0], "rb") as fp: encoding = util.parse_encoding(fp) if not encoding: encoding = "utf-8" fp.seek(0) self.source = fp.read() if encoding: self.source = self.source.decode(encoding) except IOError: self.source = "" self.lineno = new_trcback[-1][1] return new_trcback def text_error_template(lookup=None): """Provides a template that renders a stack trace in a similar format to the Python interpreter, substituting source template filenames, line numbers and code for that of the originating source template, as applicable. """ import mako.template return mako.template.Template( r""" <%page args="error=None, traceback=None"/> <%! from mako.exceptions import RichTraceback %>\ <% tback = RichTraceback(error=error, traceback=traceback) %>\ Traceback (most recent call last): % for (filename, lineno, function, line) in tback.traceback: File "${filename}", line ${lineno}, in ${function or '?'} ${line | trim} % endfor ${tback.errorname}: ${tback.message} """ ) def _install_pygments(): global syntax_highlight, pygments_html_formatter from mako.ext.pygmentplugin import syntax_highlight # noqa from mako.ext.pygmentplugin import pygments_html_formatter # noqa def _install_fallback(): global syntax_highlight, pygments_html_formatter from mako.filters import html_escape pygments_html_formatter = None def syntax_highlight(filename="", language=None): return html_escape def _install_highlighting(): try: _install_pygments() except ImportError: _install_fallback() _install_highlighting() def html_error_template(): """Provides a template that renders a stack trace in an HTML format, providing an excerpt of code as well as substituting source template filenames, line numbers and code for that of the originating source template, as applicable. The template's default ``encoding_errors`` value is ``'htmlentityreplace'``. The template has two options. With the ``full`` option disabled, only a section of an HTML document is returned. With the ``css`` option disabled, the default stylesheet won't be included. """ import mako.template return mako.template.Template( r""" <%! from mako.exceptions import RichTraceback, syntax_highlight,\ pygments_html_formatter %> <%page args="full=True, css=True, error=None, traceback=None"/> % if full: <html> <head> <title>Mako Runtime Error</title> % endif % if css: <style> body { font-family:verdana; margin:10px 30px 10px 30px;} .stacktrace { margin:5px 5px 5px 5px; } .highlight { padding:0px 10px 0px 10px; background-color:#9F9FDF; } .nonhighlight { padding:0px; background-color:#DFDFDF; } .sample { padding:10px; margin:10px 10px 10px 10px; font-family:monospace; } .sampleline { padding:0px 10px 0px 10px; } .sourceline { margin:5px 5px 10px 5px; font-family:monospace;} .location { font-size:80%; } .highlight { white-space:pre; } .sampleline { white-space:pre; } % if pygments_html_formatter: ${pygments_html_formatter.get_style_defs()} .linenos { min-width: 2.5em; text-align: right; } pre { margin: 0; } .syntax-highlighted { padding: 0 10px; } .syntax-highlightedtable { border-spacing: 1px; } .nonhighlight { border-top: 1px solid #DFDFDF; border-bottom: 1px solid #DFDFDF; } .stacktrace .nonhighlight { margin: 5px 15px 10px; } .sourceline { margin: 0 0; font-family:monospace; } .code { background-color: #F8F8F8; width: 100%; } .error .code { background-color: #FFBDBD; } .error .syntax-highlighted { background-color: #FFBDBD; } % endif </style> % endif % if full: </head> <body> % endif <h2>Error !</h2> <% tback = RichTraceback(error=error, traceback=traceback) src = tback.source line = tback.lineno if src: lines = src.split('\n') else: lines = None %> <h3>${tback.errorname}: ${tback.message|h}</h3> % if lines: <div class="sample"> <div class="nonhighlight"> % for index in range(max(0, line-4),min(len(lines), line+5)): <% if pygments_html_formatter: pygments_html_formatter.linenostart = index + 1 %> % if index + 1 == line: <% if pygments_html_formatter: old_cssclass = pygments_html_formatter.cssclass pygments_html_formatter.cssclass = 'error ' + old_cssclass %> ${lines[index] | syntax_highlight(language='mako')} <% if pygments_html_formatter: pygments_html_formatter.cssclass = old_cssclass %> % else: ${lines[index] | syntax_highlight(language='mako')} % endif % endfor </div> </div> % endif <div class="stacktrace"> % for (filename, lineno, function, line) in tback.reverse_traceback: <div class="location">${filename}, line ${lineno}:</div> <div class="nonhighlight"> <% if pygments_html_formatter: pygments_html_formatter.linenostart = lineno %> <div class="sourceline">${line | syntax_highlight(filename)}</div> </div> % endfor </div> % if full: </body> </html> % endif """, output_encoding=sys.getdefaultencoding(), encoding_errors="htmlentityreplace", )