From caff8a673abb3faba56fa4aef71daacca2e391f7 Mon Sep 17 00:00:00 2001 From: Martin Mares Date: Sun, 26 Sep 2004 12:28:45 +0000 Subject: [PATCH] Converted to Perl module. --- UCW/Temple.pm | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++ temple | 156 +++------------------------------------------- 2 files changed, 175 insertions(+), 149 deletions(-) create mode 100755 UCW/Temple.pm diff --git a/UCW/Temple.pm b/UCW/Temple.pm new file mode 100755 index 0000000..41af968 --- /dev/null +++ b/UCW/Temple.pm @@ -0,0 +1,168 @@ +#!/usr/bin/perl +# A really simple template engine +# (c) 2004 Martin Mares + +package UCW::Temple; + +use strict; +use warnings; +no strict 'vars'; + +use IO::File; + +our @cond; +our $temp; + +sub get_nested($$$) { + my ($r,$left,$right) = @_; + pos $$r = pos($$r)-1; + my $z = ""; + my $nest = 0; + do { + if ($$r =~ /\G([^$left$right]+)/cgs) { + } elsif ($$r =~ /\G([$left])/cgs) { + $nest++; + } elsif ($$r =~ /\G([$right])/cgs) { + $nest--; + } else { + die "File ended when looking for matching $right"; + } + $z .= $1; + } while ($nest); + return $z; +} + +sub eval_if_ok($) { + if ($cond[0] > 0) { + my $x = shift; + my $res = eval $x; + return $res unless $@; + die "Error evaluating $x: $@"; + } else { + return ""; + } +} + +sub eval_func($$) { + my ($f, $a) = @_; + if ($f =~ /^(if|fi|else|elif)$/) { + if ($f eq "if") { + $a ne "()" or die "\@if requires an argument"; + if ($cond[0] > 0) { + unshift @cond, (eval_if_ok($a) ? 1 : -1); + } else { + unshift @cond, 0; + } + } elsif ($f eq "fi") { + $a eq "()" or die "\@fi takes no arguments"; + $#cond or die "\@fi without \@if"; + shift @cond; + } elsif ($f eq "else") { + $a eq "()" or die "\@else takes no arguments"; + $#cond or die "\@else without \@if"; + $cond[0] = -$cond[0]; + } elsif ($f eq "elif") { + $a ne "()" or die "\@elif requires an argument"; + $#cond or die "\@elif without \@if"; + if ($cond[0] > 0) { + $cond[0] = 0; + } elsif ($cond[0] < 0) { + $cond[0] = 1; + $cond[0] = (eval_if_ok($a) ? 1 : -1); + } + } + # print "Cond stack: @cond\n"; + } else { + eval_if_ok("$f($a)"); + } +} + +sub parse_string($) { + my ($t) = @_; + pos $t = 0; + for(;;) { + if ($t =~ /\G([^\@]+)/cgs) { + print $1 if $cond[0] > 0; + } elsif ($t =~ /\G\@\s*\n/cgs) { + # @ at end of line is ignored and eats the end of line + } elsif ($t =~ /\G\@#[^\n]*\n/cgs) { + # a comment, which is ignored + } elsif ($t =~ /\G\@\@/cgs) { + print "\@"; + } elsif ($t =~ /\G\@{/cgs) { + my $x = get_nested(\$t, "{", "}"); + print eval_if_ok($x); + } elsif ($t =~ /\G\@\[/cgs) { + my $x = get_nested(\$t, '\[', '\]'); + $x =~ s/^\[//; + $x =~ s/$\]//; + eval_if_ok($x); + } elsif ($t =~ /\G\@(\w+)\(/cgs) { + my $func = $1; + my $args = get_nested(\$t, '(', ')'); + eval_func($func, $args); + } elsif ($t =~ /\G\@(\w+)([^\n]*)\n/cgs) { + eval_func($1, "($2)"); + } elsif ($t =~ /\G\@(\$\w+)/cgs) { + print eval_if_ok($1); + } elsif ($t =~ /\G(\@[^\n]*)/cgs) { + die "Unknown control sequence $1"; + } elsif ($t =~ /\G$/cgs) { + last; + } elsif ($t =~ /\G([^\n]*)/cgs) { + die "Internal parser error at $1 (pos " . pos($t) . ")"; + } else { die; } + } +} + +sub parse_file($) { + my ($name) = @_; + my $fh = new IO::File $name; + die "Unable to open $name: $!" unless defined $fh; + my $text; + { local $/; undef $/; $text = <$fh>; } + undef $fh; + parse_string($text); +} + +sub start() +{ + @cond = (1); +} + +sub finish() +{ + $#cond and die "Unterminated \@if (depth $#cond)"; +} + +sub process_file($) { + start(); + parse_file($_[0]); + finish(); +} + +sub process_string($) { + start(); + parse_string($_[0]); + finish(); +} + +### Commands available from the templates + +sub include { + my $fn = shift @_; + while (@_) { + my $v = shift @_; + $temp = shift @_; + eval_if_ok("\$$v = \$temp"); + } + parse_file($fn); +} + +sub load { + my $f = shift @_; + (!defined $f || @_) and die "\@load requires only one argument"; + require $f; +} + +1; diff --git a/temple b/temple index e8d2072..6f07483 100755 --- a/temple +++ b/temple @@ -4,157 +4,15 @@ use strict; use warnings; -no strict 'vars'; -use IO::File; +use UCW::Temple; -our @cond; -our $temp; - -sub get_nested($$$) { - my ($r,$left,$right) = @_; - pos $$r = pos($$r)-1; - my $z = ""; - my $nest = 0; - do { - if ($$r =~ /\G([^$left$right]+)/cgs) { - } elsif ($$r =~ /\G([$left])/cgs) { - $nest++; - } elsif ($$r =~ /\G([$right])/cgs) { - $nest--; - } else { - die "File ended when looking for matching $right"; - } - $z .= $1; - } while ($nest); - return $z; -} - -sub eval_if_ok($) { - if ($cond[0] > 0) { - my $x = shift; - my $res = eval $x; - return $res unless $@; - die "Error evaluating $x: $@"; - } else { - return ""; - } -} - -sub eval_func($$) { - my ($f, $a) = @_; - if ($f =~ /^(if|fi|else|elif)$/) { - if ($f eq "if") { - $a ne "()" or die "\@if requires an argument"; - if ($cond[0] > 0) { - unshift @cond, (eval_if_ok($a) ? 1 : -1); - } else { - unshift @cond, 0; - } - } elsif ($f eq "fi") { - $a eq "()" or die "\@fi takes no arguments"; - $#cond or die "\@fi without \@if"; - shift @cond; - } elsif ($f eq "else") { - $a eq "()" or die "\@else takes no arguments"; - $#cond or die "\@else without \@if"; - $cond[0] = -$cond[0]; - } elsif ($f eq "elif") { - $a ne "()" or die "\@elif requires an argument"; - $#cond or die "\@elif without \@if"; - if ($cond[0] > 0) { - $cond[0] = 0; - } elsif ($cond[0] < 0) { - $cond[0] = 1; - $cond[0] = (eval_if_ok($a) ? 1 : -1); - } - } - # print "Cond stack: @cond\n"; - } else { - eval_if_ok("$f($a)"); - } -} - -sub process_string($) { - my ($t) = @_; - pos $t = 0; - for(;;) { - if ($t =~ /\G([^\@]+)/cgs) { - print $1 if $cond[0] > 0; - } elsif ($t =~ /\G\@\s*\n/cgs) { - # @ at end of line is ignored and eats the end of line - } elsif ($t =~ /\G\@#[^\n]*\n/cgs) { - # a comment, which is ignored - } elsif ($t =~ /\G\@\@/cgs) { - print "\@"; - } elsif ($t =~ /\G\@{/cgs) { - my $x = get_nested(\$t, "{", "}"); - print eval_if_ok($x); - } elsif ($t =~ /\G\@\[/cgs) { - my $x = get_nested(\$t, '\[', '\]'); - $x =~ s/^\[//; - $x =~ s/$\]//; - eval_if_ok($x); - } elsif ($t =~ /\G\@(\w+)\(/cgs) { - my $func = $1; - my $args = get_nested(\$t, '(', ')'); - eval_func($func, $args); - } elsif ($t =~ /\G\@(\w+)([^\n]*)\n/cgs) { - eval_func($1, "($2)"); - } elsif ($t =~ /\G\@(\$\w+)/cgs) { - print eval_if_ok($1); - } elsif ($t =~ /\G(\@[^\n]*)/cgs) { - die "Unknown control sequence $1"; - } elsif ($t =~ /\G$/cgs) { - last; - } elsif ($t =~ /\G([^\n]*)/cgs) { - die "Internal parser error at $1 (pos " . pos($t) . ")"; - } else { die; } - } -} - -sub process_file($) { - my ($name) = @_; - my $fh = new IO::File $name; - die "Unable to open $name: $!" unless defined $fh; - my $text; - { local $/; undef $/; $text = <$fh>; } - undef $fh; - process_string($text); -} - -sub include { - my $fn = shift @_; - while (@_) { - my $v = shift @_; - $temp = shift @_; - eval_if_ok("\$$v = \$temp"); - } - process_file($fn); -} - -sub load { - my $f = shift @_; - (!defined $f || @_) and die "\@load requires only one argument"; - require $f; -} - -sub temple_start() -{ - @cond = (1); -} - -sub temple_finish() -{ - $#cond and die "Unterminated \@if (depth $#cond)"; -} - -if (@ARGV != 2) { - die "Usage: temple "; -} else { +if (@ARGV == 1) { + UCW::Temple::process_file($ARGV[0]); +} elsif (@ARGV == 2) { close STDOUT; open STDOUT, ">$ARGV[1]" or die "Cannot open $ARGV[1]: $!"; - temple_start(); - process_file($ARGV[0]); - temple_finish(); + UCW::Temple::process_file($ARGV[0]); +} else { + die "Usage: temple []"; } -- 2.39.5