hedit.py (1092B)
1# ----------------------------------------------------------------------------- 2# hedit.py 3# 4# Paring of Fortran H Edit descriptions (Contributed by Pearu Peterson) 5# 6# These tokens can't be easily tokenized because they are of the following 7# form: 8# 9# nHc1...cn 10# 11# where n is a positive integer and c1 ... cn are characters. 12# 13# This example shows how to modify the state of the lexer to parse 14# such tokens 15# ----------------------------------------------------------------------------- 16 17import sys 18sys.path.insert(0,"../..") 19 20 21tokens = ( 22 'H_EDIT_DESCRIPTOR', 23 ) 24 25# Tokens 26t_ignore = " \t\n" 27 28def t_H_EDIT_DESCRIPTOR(t): 29 r"\d+H.*" # This grabs all of the remaining text 30 i = t.value.index('H') 31 n = eval(t.value[:i]) 32 33 # Adjust the tokenizing position 34 t.lexer.lexpos -= len(t.value) - (i+1+n) 35 36 t.value = t.value[i+1:i+1+n] 37 return t 38 39def t_error(t): 40 print "Illegal character '%s'" % t.value[0] 41 t.lexer.skip(1) 42 43# Build the lexer 44import ply.lex as lex 45lex.lex() 46lex.runmain() 47 48