| #!/usr/bin/python |
| |
| # Copyright 2011 Google Inc. All Rights Reserved. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Python module for generating .ninja files. |
| |
| Note that this is emphatically not a required piece of Ninja; it's |
| just a helpful utility for build-file-generation systems that already |
| use Python. |
| """ |
| |
| import re |
| import textwrap |
| |
| def escape_path(word): |
| return word.replace('$ ', '$$ ').replace(' ', '$ ').replace(':', '$:') |
| |
| class Writer(object): |
| def __init__(self, output, width=78): |
| self.output = output |
| self.width = width |
| |
| def newline(self): |
| self.output.write('\n') |
| |
| def comment(self, text): |
| for line in textwrap.wrap(text, self.width - 2, break_long_words=False, |
| break_on_hyphens=False): |
| self.output.write('# ' + line + '\n') |
| |
| def variable(self, key, value, indent=0): |
| if value is None: |
| return |
| if isinstance(value, list): |
| value = ' '.join(filter(None, value)) # Filter out empty strings. |
| self._line('%s = %s' % (key, value), indent) |
| |
| def pool(self, name, depth): |
| self._line('pool %s' % name) |
| self.variable('depth', depth, indent=1) |
| |
| def rule(self, name, command, description=None, depfile=None, |
| generator=False, pool=None, restat=False, rspfile=None, |
| rspfile_content=None, deps=None): |
| self._line('rule %s' % name) |
| self.variable('command', command, indent=1) |
| if description: |
| self.variable('description', description, indent=1) |
| if depfile: |
| self.variable('depfile', depfile, indent=1) |
| if generator: |
| self.variable('generator', '1', indent=1) |
| if pool: |
| self.variable('pool', pool, indent=1) |
| if restat: |
| self.variable('restat', '1', indent=1) |
| if rspfile: |
| self.variable('rspfile', rspfile, indent=1) |
| if rspfile_content: |
| self.variable('rspfile_content', rspfile_content, indent=1) |
| if deps: |
| self.variable('deps', deps, indent=1) |
| |
| def build(self, outputs, rule, inputs=None, implicit=None, order_only=None, |
| variables=None, implicit_outputs=None, pool=None, dyndep=None): |
| outputs = as_list(outputs) |
| out_outputs = [escape_path(x) for x in outputs] |
| all_inputs = [escape_path(x) for x in as_list(inputs)] |
| |
| if implicit: |
| implicit = [escape_path(x) for x in as_list(implicit)] |
| all_inputs.append('|') |
| all_inputs.extend(implicit) |
| if order_only: |
| order_only = [escape_path(x) for x in as_list(order_only)] |
| all_inputs.append('||') |
| all_inputs.extend(order_only) |
| if implicit_outputs: |
| implicit_outputs = [escape_path(x) |
| for x in as_list(implicit_outputs)] |
| out_outputs.append('|') |
| out_outputs.extend(implicit_outputs) |
| |
| self._line('build %s: %s' % (' '.join(out_outputs), |
| ' '.join([rule] + all_inputs))) |
| if pool is not None: |
| self._line(' pool = %s' % pool) |
| if dyndep is not None: |
| self._line(' dyndep = %s' % dyndep) |
| |
| if variables: |
| if isinstance(variables, dict): |
| iterator = iter(variables.items()) |
| else: |
| iterator = iter(variables) |
| |
| for key, val in iterator: |
| self.variable(key, val, indent=1) |
| |
| return outputs |
| |
| def include(self, path): |
| self._line('include %s' % path) |
| |
| def subninja(self, path): |
| self._line('subninja %s' % path) |
| |
| def default(self, paths): |
| self._line('default %s' % ' '.join(as_list(paths))) |
| |
| def _count_dollars_before_index(self, s, i): |
| """Returns the number of '$' characters right in front of s[i].""" |
| dollar_count = 0 |
| dollar_index = i - 1 |
| while dollar_index > 0 and s[dollar_index] == '$': |
| dollar_count += 1 |
| dollar_index -= 1 |
| return dollar_count |
| |
| def _line(self, text, indent=0): |
| """Write 'text' word-wrapped at self.width characters.""" |
| leading_space = ' ' * indent |
| while len(leading_space) + len(text) > self.width: |
| # The text is too wide; wrap if possible. |
| |
| # Find the rightmost space that would obey our width constraint and |
| # that's not an escaped space. |
| available_space = self.width - len(leading_space) - len(' $') |
| space = available_space |
| while True: |
| space = text.rfind(' ', 0, space) |
| if (space < 0 or |
| self._count_dollars_before_index(text, space) % 2 == 0): |
| break |
| |
| if space < 0: |
| # No such space; just use the first unescaped space we can find. |
| space = available_space - 1 |
| while True: |
| space = text.find(' ', space + 1) |
| if (space < 0 or |
| self._count_dollars_before_index(text, space) % 2 == 0): |
| break |
| if space < 0: |
| # Give up on breaking. |
| break |
| |
| self.output.write(leading_space + text[0:space] + ' $\n') |
| text = text[space+1:] |
| |
| # Subsequent lines are continuations, so indent them. |
| leading_space = ' ' * (indent+2) |
| |
| self.output.write(leading_space + text + '\n') |
| |
| def close(self): |
| self.output.close() |
| |
| |
| def as_list(input): |
| if input is None: |
| return [] |
| if isinstance(input, list): |
| return input |
| return [input] |
| |
| |
| def escape(string): |
| """Escape a string such that it can be embedded into a Ninja file without |
| further interpretation.""" |
| assert '\n' not in string, 'Ninja syntax does not allow newlines' |
| # We only have one special metacharacter: '$'. |
| return string.replace('$', '$$') |
| |
| |
| def expand(string, vars, local_vars={}): |
| """Expand a string containing $vars as Ninja would. |
| |
| Note: doesn't handle the full Ninja variable syntax, but it's enough |
| to make configure.py's use of it work. |
| """ |
| def exp(m): |
| var = m.group(1) |
| if var == '$': |
| return '$' |
| return local_vars.get(var, vars.get(var, '')) |
| return re.sub(r'\$(\$|\w*)', exp, string) |
