| import plpy |
| import re |
| |
| class Formula(object): |
| def __init__(self, y_str, x_str, coef_len): |
| self.n_coef = coef_len |
| self.y = y_str.replace('"','') |
| self.x = self.parse(x_str) |
| |
| def parse(self, x_str): |
| array_expr = re.compile(r'array[[](["a-z0-9_, .]+)[]]', flags=re.I) |
| simple_col = re.compile(r'["a-z0-9_]+', flags=re.I) |
| prefix = 'x' |
| if array_expr.match(x_str) is not None: |
| x_csv = array_expr.sub(r'\1', x_str) |
| ret = [s.strip().replace('"','') for s in x_csv.split(',')] |
| if len(ret) == self.n_coef: |
| return ret |
| else: |
| pass # fall back to using 'x' |
| elif simple_col.match(x_str) is not None: |
| prefix = x_str.replace('"','') |
| return ["{0}[{1}]".format(prefix, str(i+1)) for i in range(self.n_coef)] |
| |
| def rename(self, spec): |
| if isinstance(spec, str): |
| if spec.find('{') == 0: |
| spec = spec.replace('{','').replace('}','') |
| spec = [s.strip() for s in spec.split(',')] |
| return self.rename(spec) |
| if '~' in spec: |
| (y, spec) = spec.split('~') |
| y = y.strip() |
| else: |
| y = self.y |
| if '+' in spec: |
| x = [s.strip() for s in spec.split('+')] |
| else: |
| x = [s.strip() for s in spec.split(',')] |
| if self.n_coef != len(x): |
| plpy.warning("PMML warning: unexpected namespec '" + \ |
| spec + "', using default names") |
| else: |
| self.y = y |
| self.x = x |
| else: |
| if len(spec) == self.n_coef + 1: |
| self.y = spec[0] |
| self.x = spec[1:] |
| elif len(spec) == self.n_coef: |
| self.x = spec |
| else: |
| plpy.warning("PMML warning: unexpected namespec '" + \ |
| str(spec) + "', using default names") |
| |
| |
