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# -----------------------------------------------------------------------------
# hedit.py
#
# Paring of Fortran H Edit descriptions (Contributed by Pearu Peterson)
#
# These tokens can't be easily tokenized because they are of the following
# form:
#
# nHc1...cn
#
# where n is a positive integer and c1 ... cn are characters.
#
# This example shows how to modify the state of the lexer to parse
# such tokens
# -----------------------------------------------------------------------------
import sys
if ".." not in sys.path: sys.path.insert(0,"..")
import ply.lex as lex
tokens = (
'H_EDIT_DESCRIPTOR',
)
# Tokens
t_ignore = " \t\n"
def t_H_EDIT_DESCRIPTOR(t):
r"\d+H.*" # This grabs all of the remaining text
i = t.value.index('H')
n = eval(t.value[:i])
# Adjust the tokenizing position
t.lexer.lexpos -= len(t.value) - (i+1+n)
t.value = t.value[i+1:i+1+n]
return t
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
# Build the lexer
lex.lex()
lex.runmain(data="3Habc 10Habcdefghij 2Hxy")
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