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