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#!/usr/bin/python
"""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 textwrap
import re
def escape_spaces(word):
return word.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):
self.output.write('# ' + line + '\n')
def variable(self, key, value, indent=0):
if value is None:
return
if isinstance(value, list):
value = ' '.join(value)
self._line('%s = %s' % (key, value), indent)
def rule(self, name, command, description=None, depfile=None,
generator=False):
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)
def build(self, outputs, rule, inputs=None, implicit=None, order_only=None,
variables=None):
outputs = self._as_list(outputs)
all_inputs = self._as_list(inputs)[:]
out_outputs = map(escape_spaces, outputs)
all_inputs = map(escape_spaces, all_inputs)
if implicit:
implicit = map(escape_spaces, self._as_list(implicit))
all_inputs.append('|')
all_inputs.extend(implicit)
if order_only:
order_only = map(escape_spaces, self._as_list(order_only))
all_inputs.append('||')
all_inputs.extend(order_only)
self._line('build %s: %s %s' % (' '.join(out_outputs),
rule,
' '.join(all_inputs)))
if variables:
for key, val in variables:
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(self._as_list(paths)))
def _line(self, text, indent=0):
"""Write 'text' word-wrapped at self.width characters."""
leading_space = ' ' * indent
while len(text) > self.width:
# The text is too wide; wrap if possible.
self.output.write(leading_space)
available_space = self.width - len(leading_space) - len(' $')
# Write as much as we can into this line.
done = False
written_stuff = False
while available_space > 0:
space = re.search('((\$\$)+([^$]|^)|[^$]|^) ', text)
if space:
space_idx = space.start() + 1
else:
# No spaces left.
done = True
break
if space_idx > available_space:
# We're out of space.
if written_stuff:
# See if we can fit it on the next line.
break
# If we haven't written anything yet on this line, don't
# try to wrap.
self.output.write(text[0:space_idx] + ' ')
written_stuff = True
text = text[space_idx+1:]
available_space -= space_idx+1
self.output.write('$\n')
# Subsequent lines are continuations, so indent them.
leading_space = ' ' * (indent+2)
if done:
# No more spaces, so bail.
break
self.output.write(leading_space + text + '\n')
def _as_list(self, 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('$', '$$')
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