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93 lines
3.7 KiB
Python
93 lines
3.7 KiB
Python
import os
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import os.path
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import re
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from configparser import Interpolation, NoSectionError, NoOptionError, InterpolationMissingOptionError, \
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InterpolationDepthError, InterpolationSyntaxError
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MAX_INTERPOLATION_DEPTH = 10
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class ExtendedInterpolatorWithEnv(Interpolation):
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"""Advanced variant of interpolation, supports the syntax used by
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`zc.buildout'. Enables interpolation between sections.
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This modified version also allows specifying environment variables
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using ${env:...}, and allows adding additional options using 'set_additional_options'. """
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_KEYCRE = re.compile(r"\$\{([^}]+)\}")
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def before_get(self, parser, section, option, value, defaults):
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L = []
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self._interpolate_some(parser, option, L, value, section, defaults, 1)
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return ''.join(L)
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def before_set(self, parser, section, option, value):
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tmp_value = value.replace('$$', '') # escaped dollar signs
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tmp_value = self._KEYCRE.sub('', tmp_value) # valid syntax
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if '$' in tmp_value:
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raise ValueError("invalid interpolation syntax in %r at "
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"position %d" % (value, tmp_value.find('$')))
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return value
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def _resolve_option(self, option, defaults):
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return defaults[option]
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def _resolve_section_option(self, section, option, parser):
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if section == 'env':
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return os.getenv(option, '')
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return parser.get(section, parser.optionxform(option), raw=True)
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def _interpolate_some(self, parser, option, accum, rest, section, map,
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depth):
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rawval = parser.get(section, option, raw=True, fallback=rest)
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if depth > MAX_INTERPOLATION_DEPTH:
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raise InterpolationDepthError(option, section, rawval)
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while rest:
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p = rest.find("$")
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if p < 0:
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accum.append(rest)
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return
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if p > 0:
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accum.append(rest[:p])
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rest = rest[p:]
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# p is no longer used
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c = rest[1:2]
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if c == "$":
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accum.append("$")
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rest = rest[2:]
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elif c == "{":
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m = self._KEYCRE.match(rest)
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if m is None:
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raise InterpolationSyntaxError(option, section,
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"bad interpolation variable reference %r" % rest)
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path = m.group(1).split(':')
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rest = rest[m.end():]
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sect = section
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opt = option
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try:
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if len(path) == 1:
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opt = parser.optionxform(path[0])
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v = self._resolve_option(opt, map)
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elif len(path) == 2:
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sect = path[0]
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opt = path[1]
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v = self._resolve_section_option(sect, opt, parser)
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else:
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raise InterpolationSyntaxError(
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option, section,
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"More than one ':' found: %r" % (rest,))
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except (KeyError, NoSectionError, NoOptionError):
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raise InterpolationMissingOptionError(
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option, section, rawval, ":".join(path)) from None
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if "$" in v:
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self._interpolate_some(parser, opt, accum, v, sect,
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dict(parser.items(sect, raw=True)),
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depth + 1)
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else:
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accum.append(v)
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else:
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raise InterpolationSyntaxError(
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option, section,
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"'$' must be followed by '$' or '{', "
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"found: %r" % (rest,))
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