hedit.py - mozsearch

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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

sys.path.insert(0, "../..")

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

import ply.lex as lex

lex.lex()

lex.runmain()