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#!/usr/bin/env python
#-
# Copyright (c) 2006 Verdens Gang AS
# Copyright (c) 2006-2014 Varnish Software AS
# All rights reserved.
#
# Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
# Author: Martin Blix Grydeland <martin@varnish-software.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Generate various .c and .h files for the VSL query expression parser
# and the interfaces for it.
import sys
import copy
srcroot = "../.."
buildroot = "../.."
if len(sys.argv) == 3:
srcroot = sys.argv[1]
buildroot = sys.argv[2]
#######################################################################
# These are our tokens
tokens = {
# Numerical comparisons
"T_EQ": "==",
"T_NEQ": "!=",
"T_LEQ": "<=",
"T_GEQ": ">=",
# String comparisons
"T_SEQ": "eq",
"T_SNEQ": "ne",
# Regular expression matching
"T_NOMATCH": "!~",
# Boolean operators
"T_AND": "and",
"T_OR": "or",
"T_NOT": "not",
# Miscellaneous
None: "<>~[]{}():,",
# These have handwritten recognizers
"VAL": None,
"EOI": None,
# Special
"T_TRUE": None,
}
#######################################################################
# Emit a function to recognize tokens in a string
def emit_vxp_fixed_token(fo, tokens):
recog = list()
emit = dict()
for i in tokens:
j = tokens[i]
if (j != None):
recog.append(j)
emit[j] = i
recog.sort()
rrecog = copy.copy(recog)
rrecog.sort(key = lambda x: -len(x))
fo.write("""
unsigned
vxp_fixed_token(const char *p, const char **q)
{
\tswitch (p[0]) {
""")
last_initial = None
for i in recog:
if (i[0] == last_initial):
continue
last_initial = i[0]
fo.write("\tcase '%s':\n" % last_initial)
for j in rrecog:
if (j[0] != last_initial):
continue
fo.write("\t\tif (")
k = 1
l = len(j)
while (k < l):
fo.write("p[%d] == '%s'" % (k, j[k]))
fo.write(" &&\n\t\t ")
k += 1
fo.write("(isword(p[%d]) ? !isword(p[%d]) : 1)) {\n" %
(l - 1, l))
fo.write("\t\t\t*q = p + %d;\n" % l)
fo.write("\t\t\treturn (%s);\n" % emit[j])
fo.write("\t\t}\n");
fo.write("\t\treturn (0);\n")
fo.write("\tdefault:\n\t\treturn (0);\n\t}\n}\n")
#######################################################################
# Emit the vxp_tnames (token->string) conversion array
def emit_vxp_tnames(fo, tokens):
fo.write("\nconst char * const vxp_tnames[256] = {\n")
l = list(tokens.keys())
l.sort()
for i in l:
j = tokens[i]
if j == None:
j = i
if i[0] == "'":
j = i
fo.write("\t[%s] = \"%s\",\n" % (i, j))
fo.write("};\n")
#######################################################################
def polish_tokens(tokens):
# Expand single char tokens
st = tokens[None]
del tokens[None]
for i in st:
tokens["'" + i + "'"] = i
#######################################################################
def file_header(fo):
fo.write("""/*
* NB: This file is machine generated, DO NOT EDIT!
*
* Edit and run generate.py instead
*/
""")
#######################################################################
polish_tokens(tokens)
fo = open(buildroot + "/lib/libvarnishapi/vxp_tokens.h", "w")
file_header(fo)
j = 128
l = list(tokens.keys())
l.sort()
for i in l:
if i[0] == "'":
continue
fo.write("#define\t%s %d\n" % (i, j))
j += 1
assert j < 256
fo.close()
#######################################################################
fo = open(buildroot + "/lib/libvarnishapi/vxp_fixed_token.c", "w")
file_header(fo)
fo.write("""
#include "config.h"
#include <ctype.h>
#include <stdio.h>
#include "vxp.h"
""")
emit_vxp_fixed_token(fo, tokens)
emit_vxp_tnames(fo, tokens)
fo.close()
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