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Edit File : pygen.py \| Size : 10.17 KB
# mako/pygen.py # Copyright 2006-2025 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 """utilities for generating and formatting literal Python code.""" import re from mako import exceptions class PythonPrinter: def __init__(self, stream): # indentation counter self.indent = 0 # a stack storing information about why we incremented # the indentation counter, to help us determine if we # should decrement it self.indent_detail = [] # the string of whitespace multiplied by the indent # counter to produce a line self.indentstring = " " # the stream we are writing to self.stream = stream # current line number self.lineno = 1 # a list of lines that represents a buffered "block" of code, # which can be later printed relative to an indent level self.line_buffer = [] self.in_indent_lines = False self._reset_multi_line_flags() # mapping of generated python lines to template # source lines self.source_map = {} self._re_space_comment = re.compile(r"^\s#") self._re_space = re.compile(r"^\s$") self._re_indent = re.compile(r":[ \t](?:#.)?$") self._re_compound = re.compile(r"^\s(if\|try\|elif\|while\|for\|with)") self._re_indent_keyword = re.compile( r"^\s(def\|class\|else\|elif\|except\|finally)" ) self._re_unindentor = re.compile(r"^\s(else\|elif\|except\|finally).\:") def _update_lineno(self, num): self.lineno += num def start_source(self, lineno): if self.lineno not in self.source_map: self.source_map[self.lineno] = lineno def write_blanks(self, num): self.stream.write("\n" * num) self._update_lineno(num) def write_indented_block(self, block, starting_lineno=None): """print a line or lines of python which already contain indentation. The indentation of the total block of lines will be adjusted to that of the current indent level.""" self.in_indent_lines = False for i, l in enumerate(re.split(r"\r?\n", block)): self.line_buffer.append(l) if starting_lineno is not None: self.start_source(starting_lineno + i) self._update_lineno(1) def writelines(self, lines): """print a series of lines of python.""" for line in lines: self.writeline(line) def writeline(self, line): """print a line of python, indenting it according to the current indent level. this also adjusts the indentation counter according to the content of the line. """ if not self.in_indent_lines: self._flush_adjusted_lines() self.in_indent_lines = True if ( line is None or self._re_space_comment.match(line) or self._re_space.match(line) ): hastext = False else: hastext = True is_comment = line and len(line) and line[0] == "#" # see if this line should decrease the indentation level if ( not is_comment and (not hastext or self._is_unindentor(line)) and self.indent > 0 ): self.indent -= 1 # if the indent_detail stack is empty, the user # probably put extra closures - the resulting # module wont compile. if len(self.indent_detail) == 0: # TODO: no coverage here raise exceptions.MakoException("Too many whitespace closures") self.indent_detail.pop() if line is None: return # write the line self.stream.write(self._indent_line(line) + "\n") self._update_lineno(len(line.split("\n"))) # see if this line should increase the indentation level. # note that a line can both decrase (before printing) and # then increase (after printing) the indentation level. if self._re_indent.search(line): # increment indentation count, and also # keep track of what the keyword was that indented us, # if it is a python compound statement keyword # where we might have to look for an "unindent" keyword match = self._re_compound.match(line) if match: # its a "compound" keyword, so we will check for "unindentors" indentor = match.group(1) self.indent += 1 self.indent_detail.append(indentor) else: indentor = None # its not a "compound" keyword. but lets also # test for valid Python keywords that might be indenting us, # else assume its a non-indenting line m2 = self._re_indent_keyword.match(line) if m2: self.indent += 1 self.indent_detail.append(indentor) def close(self): """close this printer, flushing any remaining lines.""" self._flush_adjusted_lines() def _is_unindentor(self, line): """return true if the given line is an 'unindentor', relative to the last 'indent' event received. """ # no indentation detail has been pushed on; return False if len(self.indent_detail) == 0: return False indentor = self.indent_detail[-1] # the last indent keyword we grabbed is not a # compound statement keyword; return False if indentor is None: return False # if the current line doesnt have one of the "unindentor" keywords, # return False match = self._re_unindentor.match(line) # if True, whitespace matches up, we have a compound indentor, # and this line has an unindentor, this # is probably good enough return bool(match) # should we decide that its not good enough, heres # more stuff to check. # keyword = match.group(1) # match the original indent keyword # for crit in [ # (r'if\|elif', r'else\|elif'), # (r'try', r'except\|finally\|else'), # (r'while\|for', r'else'), # ]: # if re.match(crit[0], indentor) and re.match(crit[1], keyword): # return True # return False def _indent_line(self, line, stripspace=""): """indent the given line according to the current indent level. stripspace is a string of space that will be truncated from the start of the line before indenting.""" if stripspace == "": # Fast path optimization. return self.indentstring self.indent + line return re.sub( r"^%s" % stripspace, self.indentstring * self.indent, line ) def _reset_multi_line_flags(self): """reset the flags which would indicate we are in a backslashed or triple-quoted section.""" self.backslashed, self.triplequoted = False, False def _in_multi_line(self, line): """return true if the given line is part of a multi-line block, via backslash or triple-quote.""" # we are only looking for explicitly joined lines here, not # implicit ones (i.e. brackets, braces etc.). this is just to # guard against the possibility of modifying the space inside of # a literal multiline string with unfortunately placed # whitespace current_state = self.backslashed or self.triplequoted self.backslashed = bool(re.search(r"\\$", line)) triples = len(re.findall(r"\"\"\"\|\'\'\'", line)) if triples == 1 or triples % 2 != 0: self.triplequoted = not self.triplequoted return current_state def _flush_adjusted_lines(self): stripspace = None self._reset_multi_line_flags() for entry in self.line_buffer: if self._in_multi_line(entry): self.stream.write(entry + "\n") else: entry = entry.expandtabs() if stripspace is None and re.search(r"^[ \t][^# \t]", entry): stripspace = re.match(r"^([ \t])", entry).group(1) self.stream.write(self._indent_line(entry, stripspace) + "\n") self.line_buffer = [] self._reset_multi_line_flags() def adjust_whitespace(text): """remove the left-whitespace margin of a block of Python code.""" state = [False, False] (backslashed, triplequoted) = (0, 1) def in_multi_line(line): start_state = state[backslashed] or state[triplequoted] if re.search(r"\\$", line): state[backslashed] = True else: state[backslashed] = False def match(reg, t): m = re.match(reg, t) if m: return m, t[len(m.group(0)) :] else: return None, t while line: if state[triplequoted]: m, line = match(r"%s" % state[triplequoted], line) if m: state[triplequoted] = False else: m, line = match(r".?(?=%s\|$)" % state[triplequoted], line) else: m, line = match(r"#", line) if m: return start_state m, line = match(r"\"\"\"\|\'\'\'", line) if m: state[triplequoted] = m.group(0) continue m, line = match(r".?(?=\"\"\"\|\'\'\'\|#\|$)", line) return start_state def _indent_line(line, stripspace=""): return re.sub(r"^%s" % stripspace, "", line) lines = [] stripspace = None for line in re.split(r"\r?\n", text): if in_multi_line(line): lines.append(line) else: line = line.expandtabs() if stripspace is None and re.search(r"^[ \t][^# \t]", line): stripspace = re.match(r"^([ \t])", line).group(1) lines.append(_indent_line(line, stripspace)) return "\n".join(lines) Back

Edit File : pygen.py | Size : 10.17 KB

# mako/pygen.py
# Copyright 2006-2025 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

"""utilities for generating and formatting literal Python code."""

import re

from mako import exceptions

class PythonPrinter:
    def __init__(self, stream):
        # indentation counter
        self.indent = 0

# a stack storing information about why we incremented
        # the indentation counter, to help us determine if we
        # should decrement it
        self.indent_detail = []

# the string of whitespace multiplied by the indent
        # counter to produce a line
        self.indentstring = "    "

# the stream we are writing to
        self.stream = stream

# current line number
        self.lineno = 1

# a list of lines that represents a buffered "block" of code,
        # which can be later printed relative to an indent level
        self.line_buffer = []

self.in_indent_lines = False

self._reset_multi_line_flags()

# mapping of generated python lines to template
        # source lines
        self.source_map = {}

def _update_lineno(self, num):
        self.lineno += num

def start_source(self, lineno):
        if self.lineno not in self.source_map:
            self.source_map[self.lineno] = lineno

def write_blanks(self, num):
        self.stream.write("\n" * num)
        self._update_lineno(num)

def write_indented_block(self, block, starting_lineno=None):
        """print a line or lines of python which already contain indentation.

The indentation of the total block of lines will be adjusted to that of
        the current indent level."""
        self.in_indent_lines = False
        for i, l in enumerate(re.split(r"\r?\n", block)):
            self.line_buffer.append(l)
            if starting_lineno is not None:
                self.start_source(starting_lineno + i)
            self._update_lineno(1)

def writelines(self, *lines):
        """print a series of lines of python."""
        for line in lines:
            self.writeline(line)

def writeline(self, line):
        """print a line of python, indenting it according to the current
        indent level.

this also adjusts the indentation counter according to the
        content of the line.

"""

if not self.in_indent_lines:
            self._flush_adjusted_lines()
            self.in_indent_lines = True

if (
            line is None
            or self._re_space_comment.match(line)
            or self._re_space.match(line)
        ):
            hastext = False
        else:
            hastext = True

is_comment = line and len(line) and line[0] == "#"

# see if this line should decrease the indentation level
        if (
            not is_comment
            and (not hastext or self._is_unindentor(line))
            and self.indent > 0
        ):
            self.indent -= 1
            # if the indent_detail stack is empty, the user
            # probably put extra closures - the resulting
            # module wont compile.
            if len(self.indent_detail) == 0:
                # TODO: no coverage here
                raise exceptions.MakoException("Too many whitespace closures")
            self.indent_detail.pop()

if line is None:
            return

# write the line
        self.stream.write(self._indent_line(line) + "\n")
        self._update_lineno(len(line.split("\n")))

# see if this line should increase the indentation level.
        # note that a line can both decrase (before printing) and
        # then increase (after printing) the indentation level.

if self._re_indent.search(line):
            # increment indentation count, and also
            # keep track of what the keyword was that indented us,
            # if it is a python compound statement keyword
            # where we might have to look for an "unindent" keyword
            match = self._re_compound.match(line)
            if match:
                # its a "compound" keyword, so we will check for "unindentors"
                indentor = match.group(1)
                self.indent += 1
                self.indent_detail.append(indentor)
            else:
                indentor = None
                # its not a "compound" keyword.  but lets also
                # test for valid Python keywords that might be indenting us,
                # else assume its a non-indenting line
                m2 = self._re_indent_keyword.match(line)
                if m2:
                    self.indent += 1
                    self.indent_detail.append(indentor)

def close(self):
        """close this printer, flushing any remaining lines."""
        self._flush_adjusted_lines()

def _is_unindentor(self, line):
        """return true if the given line is an 'unindentor',
        relative to the last 'indent' event received.

"""

# no indentation detail has been pushed on; return False
        if len(self.indent_detail) == 0:
            return False

indentor = self.indent_detail[-1]

# the last indent keyword we grabbed is not a
        # compound statement keyword; return False
        if indentor is None:
            return False

# if the current line doesnt have one of the "unindentor" keywords,
        # return False
        match = self._re_unindentor.match(line)
        # if True, whitespace matches up, we have a compound indentor,
        # and this line has an unindentor, this
        # is probably good enough
        return bool(match)

# should we decide that its not good enough, heres
        # more stuff to check.
        # keyword = match.group(1)

# match the original indent keyword
        # for crit in [
        #   (r'if|elif', r'else|elif'),
        #   (r'try', r'except|finally|else'),
        #   (r'while|for', r'else'),
        # ]:
        #   if re.match(crit[0], indentor) and re.match(crit[1], keyword):
        #        return True

# return False

def _indent_line(self, line, stripspace=""):
        """indent the given line according to the current indent level.

stripspace is a string of space that will be truncated from the
        start of the line before indenting."""
        if stripspace == "":
            # Fast path optimization.
            return self.indentstring * self.indent + line

return re.sub(
            r"^%s" % stripspace, self.indentstring * self.indent, line
        )

def _reset_multi_line_flags(self):
        """reset the flags which would indicate we are in a backslashed
        or triple-quoted section."""

self.backslashed, self.triplequoted = False, False

def _in_multi_line(self, line):
        """return true if the given line is part of a multi-line block,
        via backslash or triple-quote."""

# we are only looking for explicitly joined lines here, not
        # implicit ones (i.e. brackets, braces etc.).  this is just to
        # guard against the possibility of modifying the space inside of
        # a literal multiline string with unfortunately placed
        # whitespace

current_state = self.backslashed or self.triplequoted

self.backslashed = bool(re.search(r"\\$", line))
        triples = len(re.findall(r"\"\"\"|\'\'\'", line))
        if triples == 1 or triples % 2 != 0:
            self.triplequoted = not self.triplequoted

return current_state

def _flush_adjusted_lines(self):
        stripspace = None
        self._reset_multi_line_flags()

for entry in self.line_buffer:
            if self._in_multi_line(entry):
                self.stream.write(entry + "\n")
            else:
                entry = entry.expandtabs()
                if stripspace is None and re.search(r"^[ \t]*[^# \t]", entry):
                    stripspace = re.match(r"^([ \t]*)", entry).group(1)
                self.stream.write(self._indent_line(entry, stripspace) + "\n")

self.line_buffer = []
        self._reset_multi_line_flags()

def adjust_whitespace(text):
    """remove the left-whitespace margin of a block of Python code."""

state = [False, False]
    (backslashed, triplequoted) = (0, 1)

def in_multi_line(line):
        start_state = state[backslashed] or state[triplequoted]

if re.search(r"\\$", line):
            state[backslashed] = True
        else:
            state[backslashed] = False

def match(reg, t):
            m = re.match(reg, t)
            if m:
                return m, t[len(m.group(0)) :]
            else:
                return None, t

while line:
            if state[triplequoted]:
                m, line = match(r"%s" % state[triplequoted], line)
                if m:
                    state[triplequoted] = False
                else:
                    m, line = match(r".*?(?=%s|$)" % state[triplequoted], line)
            else:
                m, line = match(r"#", line)
                if m:
                    return start_state

m, line = match(r"\"\"\"|\'\'\'", line)
                if m:
                    state[triplequoted] = m.group(0)
                    continue

m, line = match(r".*?(?=\"\"\"|\'\'\'|#|$)", line)

return start_state

def _indent_line(line, stripspace=""):
        return re.sub(r"^%s" % stripspace, "", line)

lines = []
    stripspace = None

for line in re.split(r"\r?\n", text):
        if in_multi_line(line):
            lines.append(line)
        else:
            line = line.expandtabs()
            if stripspace is None and re.search(r"^[ \t]*[^# \t]", line):
                stripspace = re.match(r"^([ \t]*)", line).group(1)
            lines.append(_indent_line(line, stripspace))
    return "\n".join(lines)

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