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Commit 1a4681ed authored by Russ Cox's avatar Russ Cox
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exp/regexp/syntax: more escapes, character classes 

Still TODO: parsing optimizations

make_perl_groups.pl is copied with minimal modifications
(just to generate Go syntax instead of C++) from RE2.
Google Inc is "The RE2 Author" of that file and is one of
the Go Authors, so copyright changed to the Go Authors instead.

R=sam.thorogood, r, fvbommel, robert.hencke
CC=golang-dev
https://golang.org/cl/4612041
parent 340251e4
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Showing with 293 additions and 53 deletions
src/pkg/exp/regexp/syntax/Makefile
View file @ 1a4681ed
......@@ -7,6 +7,7 @@ include ../../../../Make.inc
TARG=exp/regexp/syntax
GOFILES=\
parse.go\
perl_groups.go\
regexp.go\
include ../../../../Make.pkg
src/pkg/exp/regexp/syntax/make_perl_groups.pl 0 → 100755
View file @ 1a4681ed
#!/usr/bin/perl
# Copyright 2008 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
# Modified version of RE2's make_perl_groups.pl.
# Generate table entries giving character ranges
# for POSIX/Perl character classes. Rather than
# figure out what the definition is, it is easier to ask
# Perl about each letter from 0-128 and write down
# its answer.
@posixclasses = (
"[:alnum:]",
"[:alpha:]",
"[:ascii:]",
"[:blank:]",
"[:cntrl:]",
"[:digit:]",
"[:graph:]",
"[:lower:]",
"[:print:]",
"[:punct:]",
"[:space:]",
"[:upper:]",
"[:word:]",
"[:xdigit:]",
);
@perlclasses = (
"\\d",
"\\s",
"\\w",
);
sub ComputeClass($) {
my @ranges;
my ($class) = @_;
my $regexp = "[$class]";
my $start = -1;
for (my $i=0; $i<=129; $i++) {
if ($i == 129) { $i = 256; }
if ($i <= 128 && chr($i) =~ $regexp) {
if ($start < 0) {
$start = $i;
}
} else {
if ($start >= 0) {
push @ranges, [$start, $i-1];
}
$start = -1;
}
}
return @ranges;
}
sub PrintClass($$@) {
my ($cname, $name, @ranges) = @_;
print "var code$cname = []int{ /* $name */\n";
for (my $i=0; $i<@ranges; $i++) {
my @a = @{$ranges[$i]};
printf "\t0x%x, 0x%x,\n", $a[0], $a[1];
}
print "}\n\n";
my $n = @ranges;
$negname = $name;
if ($negname =~ /:/) {
$negname =~ s/:/:^/;
} else {
$negname =~ y/a-z/A-Z/;
}
return "\t`$name`: {+1, code$cname},\n" .
"\t`$negname`: {-1, code$cname},\n";
}
my $gen = 0;
sub PrintClasses($@) {
my ($cname, @classes) = @_;
my @entries;
foreach my $cl (@classes) {
my @ranges = ComputeClass($cl);
push @entries, PrintClass(++$gen, $cl, @ranges);
}
print "var ${cname}Group = map[string]charGroup{\n";
foreach my $e (@entries) {
print $e;
}
print "}\n";
my $count = @entries;
}
print <<EOF;
// GENERATED BY make_perl_groups.pl; DO NOT EDIT.
// make_perl_groups.pl >perl_groups.go
package syntax
EOF
PrintClasses("perl", @perlclasses);
PrintClasses("posix", @posixclasses);
src/pkg/exp/regexp/syntax/parse.go
View file @ 1a4681ed
This diff is collapsed.
src/pkg/exp/regexp/syntax/parse_test.go
View file @ 1a4681ed
......@@ -32,68 +32,74 @@ var parseTests = []struct {
{"a*", "star{lit{a}}"},
{"a+", "plus{lit{a}}"},
{"a?", "que{lit{a}}"},
// { "a{2}", "rep{2,2 lit{a}}" },
// { "a{2,3}", "rep{2,3 lit{a}}" },
// { "a{2,}", "rep{2,-1 lit{a}}" },
// { "a*?", "nstar{lit{a}}" },
// { "a+?", "nplus{lit{a}}" },
// { "a??", "nque{lit{a}}" },
// { "a{2}?", "nrep{2,2 lit{a}}" },
// { "a{2,3}?", "nrep{2,3 lit{a}}" },
// { "a{2,}?", "nrep{2,-1 lit{a}}" },
{"a{2}", "rep{2,2 lit{a}}"},
{"a{2,3}", "rep{2,3 lit{a}}"},
{"a{2,}", "rep{2,-1 lit{a}}"},
{"a*?", "nstar{lit{a}}"},
{"a+?", "nplus{lit{a}}"},
{"a??", "nque{lit{a}}"},
{"a{2}?", "nrep{2,2 lit{a}}"},
{"a{2,3}?", "nrep{2,3 lit{a}}"},
{"a{2,}?", "nrep{2,-1 lit{a}}"},
{"", "emp{}"},
// { "|", "emp{}" }, // alt{emp{}emp{}} but got factored
// { "|", "alt{emp{}emp{}}" },
{"|", "alt{emp{}emp{}}"},
{"|x|", "alt{emp{}lit{x}emp{}}"},
{".", "dot{}"},
{"^", "bol{}"},
{"$", "eol{}"},
// { "\\|", "lit{|}" },
// { "\\(", "lit{(}" },
// { "\\)", "lit{)}" },
// { "\\*", "lit{*}" },
// { "\\+", "lit{+}" },
// { "\\?", "lit{?}" },
// { "{", "lit{{}" },
{"\\|", "lit{|}"},
{"\\(", "lit{(}"},
{"\\)", "lit{)}"},
{"\\*", "lit{*}"},
{"\\+", "lit{+}"},
{"\\?", "lit{?}"},
{"{", "lit{{}"},
{"}", "lit{}}"},
// { "\\.", "lit{.}" },
// { "\\^", "lit{^}" },
// { "\\$", "lit{$}" },
// { "\\\\", "lit{\\}" },
{"\\.", "lit{.}"},
{"\\^", "lit{^}"},
{"\\$", "lit{$}"},
{"\\\\", "lit{\\}"},
{"[ace]", "cc{0x61 0x63 0x65}"},
{"[abc]", "cc{0x61-0x63}"},
{"[a-z]", "cc{0x61-0x7a}"},
// { "[a]", "lit{a}" },
{"[a]", "cc{0x61}"},
// { "\\-", "lit{-}" },
{"\\-", "lit{-}"},
{"-", "lit{-}"},
// { "\\_", "lit{_}" },
{"\\_", "lit{_}"},
// Posix and Perl extensions
// { "[[:lower:]]", "cc{0x61-0x7a}" },
// { "[a-z]", "cc{0x61-0x7a}" },
// { "[^[:lower:]]", "cc{0x0-0x60 0x7b-0x10ffff}" },
// { "[[:^lower:]]", "cc{0x0-0x60 0x7b-0x10ffff}" },
{"[[:lower:]]", "cc{0x61-0x7a}"},
{"[a-z]", "cc{0x61-0x7a}"},
{"[^[:lower:]]", "cc{0x0-0x60 0x7b-0x10ffff}"},
{"[[:^lower:]]", "cc{0x0-0x60 0x7b-0x10ffff}"},
// { "(?i)[[:lower:]]", "cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}" },
// { "(?i)[a-z]", "cc{0x41-0x5a 0x61-0x7a 0x17f 0x212a}" },
// { "(?i)[^[:lower:]]", "cc{0x0-0x40 0x5b-0x60 0x7b-0x17e 0x180-0x2129 0x212b-0x10ffff}" },
// { "(?i)[[:^lower:]]", "cc{0x0-0x40 0x5b-0x60 0x7b-0x17e 0x180-0x2129 0x212b-0x10ffff}" },
// { "\\d", "cc{0x30-0x39}" },
// { "\\D", "cc{0x0-0x2f 0x3a-0x10ffff}" },
// { "\\s", "cc{0x9-0xa 0xc-0xd 0x20}" },
// { "\\S", "cc{0x0-0x8 0xb 0xe-0x1f 0x21-0x10ffff}" },
// { "\\w", "cc{0x30-0x39 0x41-0x5a 0x5f 0x61-0x7a}" },
// { "\\W", "cc{0x0-0x2f 0x3a-0x40 0x5b-0x5e 0x60 0x7b-0x10ffff}" },
{"\\d", "cc{0x30-0x39}"},
{"\\D", "cc{0x0-0x2f 0x3a-0x10ffff}"},
{"\\s", "cc{0x9-0xa 0xc-0xd 0x20}"},
{"\\S", "cc{0x0-0x8 0xb 0xe-0x1f 0x21-0x10ffff}"},
{"\\w", "cc{0x30-0x39 0x41-0x5a 0x5f 0x61-0x7a}"},
{"\\W", "cc{0x0-0x2f 0x3a-0x40 0x5b-0x5e 0x60 0x7b-0x10ffff}"},
// { "(?i)\\w", "cc{0x30-0x39 0x41-0x5a 0x5f 0x61-0x7a 0x17f 0x212a}" },
// { "(?i)\\W", "cc{0x0-0x2f 0x3a-0x40 0x5b-0x5e 0x60 0x7b-0x17e 0x180-0x2129 0x212b-0x10ffff}" },
// { "[^\\\\]", "cc{0x0-0x5b 0x5d-0x10ffff}" },
{"[^\\\\]", "cc{0x0-0x5b 0x5d-0x10ffff}"},
// { "\\C", "byte{}" },
// Unicode, negatives, and a double negative.
// { "\\p{Braille}", "cc{0x2800-0x28ff}" },
// { "\\P{Braille}", "cc{0x0-0x27ff 0x2900-0x10ffff}" },
// { "\\p{^Braille}", "cc{0x0-0x27ff 0x2900-0x10ffff}" },
// { "\\P{^Braille}", "cc{0x2800-0x28ff}" },
{"\\p{Braille}", "cc{0x2800-0x28ff}"},
{"\\P{Braille}", "cc{0x0-0x27ff 0x2900-0x10ffff}"},
{"\\p{^Braille}", "cc{0x0-0x27ff 0x2900-0x10ffff}"},
{"\\P{^Braille}", "cc{0x2800-0x28ff}"},
{"\\pZ", "cc{0x20 0xa0 0x1680 0x180e 0x2000-0x200a 0x2028-0x2029 0x202f 0x205f 0x3000}"},
{"[\\p{Braille}]", "cc{0x2800-0x28ff}"},
{"[\\P{Braille}]", "cc{0x0-0x27ff 0x2900-0x10ffff}"},
{"[\\p{^Braille}]", "cc{0x0-0x27ff 0x2900-0x10ffff}"},
{"[\\P{^Braille}]", "cc{0x2800-0x28ff}"},
{"[\\pZ]", "cc{0x20 0xa0 0x1680 0x180e 0x2000-0x200a 0x2028-0x2029 0x202f 0x205f 0x3000}"},
// More interesting regular expressions.
// { "a{,2}", "str{a{,2}}" },
......@@ -101,7 +107,7 @@ var parseTests = []struct {
{"[a-zABC]", "cc{0x41-0x43 0x61-0x7a}"},
{"[^a]", "cc{0x0-0x60 0x62-0x10ffff}"},
{"[\xce\xb1-\xce\xb5\xe2\x98\xba]", "cc{0x3b1-0x3b5 0x263a}"}, // utf-8
// { "a*{", "cat{star{lit{a}}lit{{}}" },
{"a*{", "cat{star{lit{a}}lit{{}}"},
// Test precedences
// { "(?:ab)*", "star{str{ab}}" },
......@@ -114,30 +120,30 @@ var parseTests = []struct {
{"a(b|c)d", "cat{lit{a}cap{alt{lit{b}lit{c}}}lit{d}}"},
// Test flattening.
// { "(?:a)", "lit{a}" },
{"(?:a)", "lit{a}"},
// { "(?:ab)(?:cd)", "str{abcd}" },
// { "(?:a|b)|(?:c|d)", "cc{0x61-0x64}" },
// { "a|.", "dot{}" },
// { ".|a", "dot{}" },
// Test Perl quoted literals
// { "\\Q+|*?{[\\E", "str{+|*?{[}" },
// { "\\Q+\\E+", "plus{lit{+}}" },
// { "\\Q\\\\E", "lit{\\}" },
// { "\\Q\\\\\\E", "str{\\\\}" },
{"\\Q+|*?{[\\E", "str{+|*?{[}"},
{"\\Q+\\E+", "plus{lit{+}}"},
{"\\Q\\\\E", "lit{\\}"},
{"\\Q\\\\\\E", "str{\\\\}"},
// Test Perl \A and \z
// { "(?m)^", "bol{}" },
// { "(?m)$", "eol{}" },
// { "(?-m)^", "bot{}" },
// { "(?-m)$", "eot{}" },
// { "(?m)\\A", "bot{}" },
// { "(?m)\\z", "eot{\\z}" },
// { "(?-m)\\A", "bot{}" },
// { "(?-m)\\z", "eot{\\z}" },
{"(?m)^", "bol{}"},
{"(?m)$", "eol{}"},
{"(?-m)^", "bot{}"},
{"(?-m)$", "eot{}"},
{"(?m)\\A", "bot{}"},
{"(?m)\\z", "eot{\\z}"},
{"(?-m)\\A", "bot{}"},
{"(?-m)\\z", "eot{\\z}"},
// Test named captures
// { "(?P<name>a)", "cap{name:lit{a}}" },
{"(?P<name>a)", "cap{name:lit{a}}"},
// Case-folded literals
// { "[Aa]", "litfold{a}" },
......
src/pkg/exp/regexp/syntax/perl_groups.go 0 → 100644
View file @ 1a4681ed
// GENERATED BY make_perl_groups.pl; DO NOT EDIT.
// make_perl_groups.pl >perl_groups.go
package syntax
var code1 = []int{ /* \d */
0x30, 0x39,
}
var code2 = []int{ /* \s */
0x9, 0xa,
0xc, 0xd,
0x20, 0x20,
}
var code3 = []int{ /* \w */
0x30, 0x39,
0x41, 0x5a,
0x5f, 0x5f,
0x61, 0x7a,
}
var perlGroup = map[string]charGroup{
`\d`: {+1, code1},
`\D`: {-1, code1},
`\s`: {+1, code2},
`\S`: {-1, code2},
`\w`: {+1, code3},
`\W`: {-1, code3},
}
var code4 = []int{ /* [:alnum:] */
0x30, 0x39,
0x41, 0x5a,
0x61, 0x7a,
}
var code5 = []int{ /* [:alpha:] */
0x41, 0x5a,
0x61, 0x7a,
}
var code6 = []int{ /* [:ascii:] */
0x0, 0x7f,
}
var code7 = []int{ /* [:blank:] */
0x9, 0x9,
0x20, 0x20,
}
var code8 = []int{ /* [:cntrl:] */
0x0, 0x1f,
0x7f, 0x7f,
}
var code9 = []int{ /* [:digit:] */
0x30, 0x39,
}
var code10 = []int{ /* [:graph:] */
0x21, 0x7e,
}
var code11 = []int{ /* [:lower:] */
0x61, 0x7a,
}
var code12 = []int{ /* [:print:] */
0x20, 0x7e,
}
var code13 = []int{ /* [:punct:] */
0x21, 0x2f,
0x3a, 0x40,
0x5b, 0x60,
0x7b, 0x7e,
}
var code14 = []int{ /* [:space:] */
0x9, 0xd,
0x20, 0x20,
}
var code15 = []int{ /* [:upper:] */
0x41, 0x5a,
}
var code16 = []int{ /* [:word:] */
0x30, 0x39,
0x41, 0x5a,
0x5f, 0x5f,
0x61, 0x7a,
}
var code17 = []int{ /* [:xdigit:] */
0x30, 0x39,
0x41, 0x46,
0x61, 0x66,
}
var posixGroup = map[string]charGroup{
`[:alnum:]`: {+1, code4},
`[:^alnum:]`: {-1, code4},
`[:alpha:]`: {+1, code5},
`[:^alpha:]`: {-1, code5},
`[:ascii:]`: {+1, code6},
`[:^ascii:]`: {-1, code6},
`[:blank:]`: {+1, code7},
`[:^blank:]`: {-1, code7},
`[:cntrl:]`: {+1, code8},
`[:^cntrl:]`: {-1, code8},
`[:digit:]`: {+1, code9},
`[:^digit:]`: {-1, code9},
`[:graph:]`: {+1, code10},
`[:^graph:]`: {-1, code10},
`[:lower:]`: {+1, code11},
`[:^lower:]`: {-1, code11},
`[:print:]`: {+1, code12},
`[:^print:]`: {-1, code12},
`[:punct:]`: {+1, code13},
`[:^punct:]`: {-1, code13},
`[:space:]`: {+1, code14},
`[:^space:]`: {-1, code14},
`[:upper:]`: {+1, code15},
`[:^upper:]`: {-1, code15},
`[:word:]`: {+1, code16},
`[:^word:]`: {-1, code16},
`[:xdigit:]`: {+1, code17},
`[:^xdigit:]`: {-1, code17},
}
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