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#!/usr/bin/perl
#
# Format output generated by flex 2.5.31
#
# Usage:
# flex -o$output $input
# perl fix-flex $output > $tmp
# mv $tmp $output
#
# (C) Copyright 2004-2014 Dave Beckett http://www.dajobe.org/
# (C) Copyright 2004 University of Bristol
#
my $line_offset = 1; # #line directives always refer to the NEXT line
print <<'EOT';
#ifdef HAVE_CONFIG_H
#include <raptor_config.h>
#endif
EOT
$line_offset += 4; # added 4 lines above to output
my $debug = 0;
# Lexer symbol prefix such as 'turtle_lexer_'
my $prefix = undef;
# Current function or undef if out of function
my $cur_function = undef;
# State for current function for rules to use.
my(%fn_state);
while(<>) {
# find lexer prefix
if(!defined($prefix) && /^void\s*(.+?)restart\s*\(.*;$/) {
$prefix = $1;
warn "$.: Lexer prefix $prefix\n"
if $debug > 0;
}
# Remove generated yy_fatal_error declaration and definition to avoid warnings about unused/non-defined static function
# declaration
if(/^static void yy_fatal_error\s*\(.*\)\s*\;\s*$/) {
$line_offset--; # skipped 1 line
next;
}
# definition
if(/^static void yy_fatal_error\s*\(.*\)\s*[^\;]\s*$/) {
do {
$_=<>;
$line_offset--; # skipped 1 line
} while(!/^}/);
$line_offset--; # skipped 1 line
next;
}
# Replace calls to yy_fatal_error("msg", yyscanner) to YY_FATAL_ERROR("msg") macro
s/(^\s*)yy_fatal_error\s*\(\s*(\".*\")\s*,\s*yyscanner\s*\)/$1YY_FATAL_ERROR($2)/;
# flex has %option nounistd however it does not work in 2.5.31
# It is safe to add yet another wrapper.
if(m%^(\#include \<unistd.h\>)$%) {
$_=<<"EOT";
#ifndef YY_NO_UNISTD_H
$1
#endif
EOT
$line_offset += 2; # added 2 lines to output
}
# Fix .[ch] line references because we have added lines to it
my $line = $. + $line_offset;
s/^#line \d+ (\".*\.[ch]\")/#line $line $1/;
# Fix signed / unsigned comparison gcc 4.x warning:
# int n : in the macro YY_INPUT definition
# (size_t)num_to_read : which is silly since num_to_read is an int!
s/yyg->yy_n_chars, \(size_t\) num_to_read \)/yyg->yy_n_chars, num_to_read \)/;
# Match prefixed functions and a couple of static ones starting yy_
if(!defined($cur_function) && /^.*?((?:${prefix}|yy_)\w+)\s+\((.*)$/) {
my($f,$rest)=($1,$2);
if($rest !~ /;$/) {
$cur_function=$1;
warn "$.: Now in $cur_function: $_\n"
if $debug > 1;
%fn_state=();
}
} elsif(defined($cur_function) && /^\}/) {
warn "$.: End of $cur_function\n"
if $debug > 1;
$cur_function = undef;
%fn_state=();
}
# Fix declaration of signed 'i' operating over range of yy_size_t
if($cur_function eq $prefix."_scan_bytes") {
s/int i;/yy_size_t i;/;
}
# Add $prefix_cleanup() call at the end of $prefix_lex_destroy()
# find the start of lex_destroy function definition and capture prefix
# look for lexer_free(yyscanner, yyscanner) statement within the function and place the cleanup call before it
if($cur_function eq $prefix."lex_destroy") {
if(/(^\s*)(${prefix}free\s*\(\s*yyscanner\s*,\s*yyscanner\s*\)\s*\;)\s*$/) {
$_=<<"EOT";
$1/* clean up leaks if any before freeing yyscanner */
$1${prefix}cleanup(yyscanner);
$1$2
EOT
$line_offset += 2; # added 2 lines to output
}
}
if($cur_function eq $prefix."_switch_to_buffer" ||
$cur_function eq $prefix."restart" ||
$cur_function eq $prefix."push_buffer_state") {
if(!exists($fn_state{'seen_ensure'}) &&
m%^\s*${prefix}ensure_buffer_stack\s*\(%) {
$fn_state{'seen_ensure'} = 1;
} elsif(exists($fn_state{'seen_ensure'})) {
# In condition with whitespace
s%(\s+)YY_CURRENT_BUFFER(\s+)%${1}YY_CURRENT_BUFFER_LVALUE${2}%;
# In parameter or condition
s%([,\(])YY_CURRENT_BUFFER([,\)])%${1}YY_CURRENT_BUFFER_LVALUE${2}%;
}
}
if($cur_function eq 'yy_get_next_buffer') {
if(!exists($fn_state{'seen_yyinput'}) &&
m%^\s*YY_INPUT\(%) {
$fn_state{'seen_yyinput'} = 1;
} elsif(exists($fn_state{'seen_yyinput'})) {
# Remove dead code after YY_INPUT - which is a return NULL
s%^\s*YY_CURRENT_BUFFER_LVALUE->yy_n_chars\s*=\s*yyg->yy_n_chars;%%;
}
}
if($cur_function eq $prefix.'pop_buffer_state') {
# Change last if use of YY_CURRENT_BUFFER macro to unconditional value
s%^(\s*if \(\s*)YY_CURRENT_BUFFER(\s*\)\s*\{.*)$%${1}YY_CURRENT_BUFFER_LVALUE${2}%;
}
print;
}
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