diff options
Diffstat (limited to 'thcolor/_color.py')
| -rwxr-xr-x | thcolor/_color.py | 55 |
1 files changed, 35 insertions, 20 deletions
diff --git a/thcolor/_color.py b/thcolor/_color.py index 9e62072..55795d2 100755 --- a/thcolor/_color.py +++ b/thcolor/_color.py @@ -9,12 +9,14 @@ from enum import Enum as _Enum from warnings import warn as _warn +_gg_no_re = False + try: import regex as _re except ImportError: - _warn("could not import regex, trying the default `re` module.", + _warn("could not import regex, text parsing is disabled.", RuntimeWarning) - import re as _re + _gg_no_re = True from ._ref import Reference as _Reference from ._angle import Angle as _Angle @@ -35,20 +37,32 @@ __all__ = ["Color"] # Decoding utilities. # --- -_ColorPattern = _re.compile(r""" - ( - ((?P<agl_val>-? ([0-9]+\.?|[0-9]*\.[0-9]+)) \s* - (?P<agl_typ>deg|grad|rad|turn)) - | ((?P<per>[0-9]+(\.[0-9]*)? | \.[0-9]+) \s* \%) - | (?P<num>[0-9]+(\.[0-9]*)? | \.[0-9]+) - | (?P<ncol>[RYGCBM] [0-9]{0,2} (\.[0-9]*)?) - | (\# (?P<hex>[0-9a-f]{3} | [0-9a-f]{4} | [0-9a-f]{6} | [0-9a-f]{8})) - | ((?P<name>[a-z]([a-z0-9\s_-]*[a-z0-9_-])?) - ( \s* \( \s* (?P<arg> (?0)? ) \s* \) )?) - ) - - \s* ((?P<sep>[,/\s]) \s* (?P<nextargs> (?0))?)? -""", _re.VERBOSE | _re.I | _re.M) +_color_pattern = None + +def _get_color_pattern(): + global _color_pattern + + if _color_pattern is None: + if _gg_no_re: + raise ImportError("text parsing is disabled until you install " \ + "the 'regex' module, e.g. via `pip install regex`.") + + _color_pattern = _re.compile(r""" + ( + ((?P<agl_val>-? ([0-9]+\.?|[0-9]*\.[0-9]+)) \s* + (?P<agl_typ>deg|grad|rad|turn)) + | ((?P<per>[0-9]+(\.[0-9]*)? | \.[0-9]+) \s* \%) + | (?P<num>[0-9]+(\.[0-9]*)? | \.[0-9]+) + | (?P<ncol>[RYGCBM] [0-9]{0,2} (\.[0-9]*)?) + | (\# (?P<hex>[0-9a-f]{3} | [0-9a-f]{4} | [0-9a-f]{6} | [0-9a-f]{8})) + | ((?P<name>[a-z]([a-z0-9\s_-]*[a-z0-9_-])?) + ( \s* \( \s* (?P<arg> (?0)? ) \s* \) )?) + ) + + \s* ((?P<sep>[,/\s]) \s* (?P<nextargs> (?0))?)? + """, _re.VERBOSE | _re.I | _re.M) + + return _color_pattern # --- # Color initialization varargs utilities. @@ -582,7 +596,7 @@ class Color: # Get the arguments. args = recurse(column + match.start('arg'), - _ColorPattern.fullmatch(match['arg'])) + _get_color_pattern().fullmatch(match['arg'])) # Get the function and call it with the arguments. @@ -631,7 +645,8 @@ class Color: # Get the following arguments and check. args = recurse(column + match.start('nextargs'), - _ColorPattern.fullmatch(match['nextargs'] or "")) + _get_color_pattern().fullmatch(match['nextargs'] \ + or "")) try: assert len(args) >= 2 @@ -671,7 +686,7 @@ class Color: return (argument(column, value),) \ + recurse(column + match.start('nextargs'), - _ColorPattern.fullmatch(match['nextargs'] or "")) + _get_color_pattern().fullmatch(match['nextargs'] or "")) # Strip the expression. @@ -682,7 +697,7 @@ class Color: # Match the expression (and check it as a whole directly). - match = _ColorPattern.fullmatch(expr) + match = _get_color_pattern().fullmatch(expr) if match is None: raise _ColorExpressionDecodingError("expression parsing failed") |