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kivitendo/modules/override/YAML/Loader.pm @ 778622af

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package YAML::Loader;
use strict; use warnings;
use YAML::Base;
use base 'YAML::Loader::Base';
use YAML::Types;

# Context constants
use constant LEAF => 1;
use constant COLLECTION => 2;
use constant VALUE => "\x07YAML\x07VALUE\x07";
use constant COMMENT => "\x07YAML\x07COMMENT\x07";

# Common YAML character sets
my $ESCAPE_CHAR = '[\\x00-\\x08\\x0b-\\x0d\\x0e-\\x1f]';
my $FOLD_CHAR = '>';
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my $LIT_CHAR = '|';
my $LIT_CHAR_RX = "\\$LIT_CHAR";
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sub load {
my $self = shift;
$self->stream($_[0] || '');
return $self->_parse();
}

# Top level function for parsing. Parse each document in order and
# handle processing for YAML headers.
sub _parse {
my $self = shift;
my (%directives, $preface);
$self->{stream} =~ s|\015\012|\012|g;
$self->{stream} =~ s|\015|\012|g;
$self->line(0);
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$self->die('YAML_PARSE_ERR_BAD_CHARS')
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if $self->stream =~ /$ESCAPE_CHAR/;
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# $self->die('YAML_PARSE_ERR_NO_FINAL_NEWLINE')
$self->{stream} .= "\n"
if length($self->stream) and
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$self->{stream} !~ s/(.)\n\Z/$1/s;
$self->lines([split /\x0a/, $self->stream, -1]);
$self->line(1);
# Throw away any comments or blanks before the header (or start of
# content for headerless streams)
$self->_parse_throwaway_comments();
$self->document(0);
$self->documents([]);
# Add an "assumed" header if there is no header and the stream is
# not empty (after initial throwaways).
if (not $self->eos) {
if ($self->lines->[0] !~ /^---(\s|$)/) {
unshift @{$self->lines}, '---';
$self->{line}--;
}
}

# Main Loop. Parse out all the top level nodes and return them.
while (not $self->eos) {
$self->anchor2node({});
$self->{document}++;
$self->done(0);
$self->level(0);
$self->offset->[0] = -1;

if ($self->lines->[0] =~ /^---\s*(.*)$/) {
my @words = split /\s+/, $1;
%directives = ();
while (@words && $words[0] =~ /^#(\w+):(\S.*)$/) {
my ($key, $value) = ($1, $2);
shift(@words);
if (defined $directives{$key}) {
$self->warn('YAML_PARSE_WARN_MULTIPLE_DIRECTIVES',
$key, $self->document);
next;
}
$directives{$key} = $value;
}
$self->preface(join ' ', @words);
}
else {
$self->die('YAML_PARSE_ERR_NO_SEPARATOR');
}

if (not $self->done) {
$self->_parse_next_line(COLLECTION);
}
if ($self->done) {
$self->{indent} = -1;
$self->content('');
}

$directives{YAML} ||= '1.0';
$directives{TAB} ||= 'NONE';
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($self->{major_version}, $self->{minor_version}) =
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split /\./, $directives{YAML}, 2;
$self->die('YAML_PARSE_ERR_BAD_MAJOR_VERSION', $directives{YAML})
if $self->major_version ne '1';
$self->warn('YAML_PARSE_WARN_BAD_MINOR_VERSION', $directives{YAML})
if $self->minor_version ne '0';
$self->die('Unrecognized TAB policy')
unless $directives{TAB} =~ /^(NONE|\d+)(:HARD)?$/;

push @{$self->documents}, $self->_parse_node();
}
return wantarray ? @{$self->documents} : $self->documents->[-1];
}

# This function is the dispatcher for parsing each node. Every node
# recurses back through here. (Inlines are an exception as they have
# their own sub-parser.)
sub _parse_node {
my $self = shift;
my $preface = $self->preface;
$self->preface('');
my ($node, $type, $indicator, $escape, $chomp) = ('') x 5;
my ($anchor, $alias, $explicit, $implicit, $class) = ('') x 5;
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($anchor, $alias, $explicit, $implicit, $preface) =
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$self->_parse_qualifiers($preface);
if ($anchor) {
$self->anchor2node->{$anchor} = CORE::bless [], 'YAML-anchor2node';
}
$self->inline('');
while (length $preface) {
my $line = $self->line - 1;
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if ($preface =~ s/^($FOLD_CHAR|$LIT_CHAR_RX)(-|\+)?\d*\s*//) {
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$indicator = $1;
$chomp = $2 if defined($2);
}
else {
$self->die('YAML_PARSE_ERR_TEXT_AFTER_INDICATOR') if $indicator;
$self->inline($preface);
$preface = '';
}
}
if ($alias) {
$self->die('YAML_PARSE_ERR_NO_ANCHOR', $alias)
unless defined $self->anchor2node->{$alias};
if (ref($self->anchor2node->{$alias}) ne 'YAML-anchor2node') {
$node = $self->anchor2node->{$alias};
}
else {
$node = do {my $sv = "*$alias"};
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push @{$self->anchor2node->{$alias}}, [\$node, $self->line];
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}
}
elsif (length $self->inline) {
$node = $self->_parse_inline(1, $implicit, $explicit);
if (length $self->inline) {
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$self->die('YAML_PARSE_ERR_SINGLE_LINE');
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}
}
elsif ($indicator eq $LIT_CHAR) {
$self->{level}++;
$node = $self->_parse_block($chomp);
$node = $self->_parse_implicit($node) if $implicit;
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$self->{level}--;
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}
elsif ($indicator eq $FOLD_CHAR) {
$self->{level}++;
$node = $self->_parse_unfold($chomp);
$node = $self->_parse_implicit($node) if $implicit;
$self->{level}--;
}
else {
$self->{level}++;
$self->offset->[$self->level] ||= 0;
if ($self->indent == $self->offset->[$self->level]) {
if ($self->content =~ /^-( |$)/) {
$node = $self->_parse_seq($anchor);
}
elsif ($self->content =~ /(^\?|\:( |$))/) {
$node = $self->_parse_mapping($anchor);
}
elsif ($preface =~ /^\s*$/) {
$node = $self->_parse_implicit('');
}
else {
$self->die('YAML_PARSE_ERR_BAD_NODE');
}
}
else {
$node = undef;
}
$self->{level}--;
}
$#{$self->offset} = $self->level;

if ($explicit) {
if ($class) {
if (not ref $node) {
my $copy = $node;
undef $node;
$node = \$copy;
}
CORE::bless $node, $class;
}
else {
$node = $self->_parse_explicit($node, $explicit);
}
}
if ($anchor) {
if (ref($self->anchor2node->{$anchor}) eq 'YAML-anchor2node') {
# XXX Can't remember what this code actually does
for my $ref (@{$self->anchor2node->{$anchor}}) {
${$ref->[0]} = $node;
$self->warn('YAML_LOAD_WARN_UNRESOLVED_ALIAS',
$anchor, $ref->[1]);
}
}
$self->anchor2node->{$anchor} = $node;
}
return $node;
}

# Preprocess the qualifiers that may be attached to any node.
sub _parse_qualifiers {
my $self = shift;
my ($preface) = @_;
my ($anchor, $alias, $explicit, $implicit, $token) = ('') x 5;
$self->inline('');
while ($preface =~ /^[&*!]/) {
my $line = $self->line - 1;
if ($preface =~ s/^\!(\S+)\s*//) {
$self->die('YAML_PARSE_ERR_MANY_EXPLICIT') if $explicit;
$explicit = $1;
}
elsif ($preface =~ s/^\!\s*//) {
$self->die('YAML_PARSE_ERR_MANY_IMPLICIT') if $implicit;
$implicit = 1;
}
elsif ($preface =~ s/^\&([^ ,:]+)\s*//) {
$token = $1;
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$self->die('YAML_PARSE_ERR_BAD_ANCHOR')
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unless $token =~ /^[a-zA-Z0-9]+$/;
$self->die('YAML_PARSE_ERR_MANY_ANCHOR') if $anchor;
$self->die('YAML_PARSE_ERR_ANCHOR_ALIAS') if $alias;
$anchor = $token;
}
elsif ($preface =~ s/^\*([^ ,:]+)\s*//) {
$token = $1;
$self->die('YAML_PARSE_ERR_BAD_ALIAS')
unless $token =~ /^[a-zA-Z0-9]+$/;
$self->die('YAML_PARSE_ERR_MANY_ALIAS') if $alias;
$self->die('YAML_PARSE_ERR_ANCHOR_ALIAS') if $anchor;
$alias = $token;
}
}
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return ($anchor, $alias, $explicit, $implicit, $preface);
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}

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# Morph a node to it's explicit type
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sub _parse_explicit {
my $self = shift;
my ($node, $explicit) = @_;
my ($type, $class);
if ($explicit =~ /^\!perl\/(hash|array|scalar)\:(\w(\w|\:\:)*)?$/) {
($type, $class) = (($1 || ''), ($2 || ''));
if (ref $node) {
return CORE::bless $node, $class;
}
else {
return CORE::bless \$node, $class;
}
}
if ($explicit =~
/^\!?perl\/(undef|glob|regexp|code|ref)\:(\w(\w|\:\:)*)?$/) {
($type, $class) = (($1 || ''), ($2 || ''));
my $type_class = "YAML::Type::$type";
no strict 'refs';
if ($type_class->can('yaml_load')) {
return $type_class->yaml_load($node, $class, $self);
}
else {
$self->die('YAML_LOAD_ERR_NO_CONVERT', 'XXX', $explicit);
}
}
# This !perl/@Foo and !perl/$Foo are deprecated but still parsed
elsif ($YAML::TagClass->{$explicit} ||
$explicit =~ m{^perl/(\@|\$)?([a-zA-Z](\w|::)+)$}
) {
$class = $YAML::TagClass->{$explicit} || $2;
if ($class->can('yaml_load')) {
require YAML::Node;
return $class->yaml_load(YAML::Node->new($node, $explicit));
}
else {
if (ref $node) {
return CORE::bless $node, $class;
}
else {
return CORE::bless \$node, $class;
}
}
}
elsif (ref $node) {
require YAML::Node;
return YAML::Node->new($node, $explicit);
}
else {
# XXX This is likely wrong. Failing test:
# --- !unknown 'scalar value'
return $node;
}
}

# Parse a YAML mapping into a Perl hash
sub _parse_mapping {
my $self = shift;
my ($anchor) = @_;
my $mapping = {};
$self->anchor2node->{$anchor} = $mapping;
my $key;
while (not $self->done and $self->indent == $self->offset->[$self->level]) {
# If structured key:
if ($self->{content} =~ s/^\?\s*//) {
$self->preface($self->content);
$self->_parse_next_line(COLLECTION);
$key = $self->_parse_node();
$key = "$key";
}
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# If "default" key (equals sign)
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elsif ($self->{content} =~ s/^\=\s*//) {
$key = VALUE;
}
# If "comment" key (slash slash)
elsif ($self->{content} =~ s/^\=\s*//) {
$key = COMMENT;
}
# Regular scalar key:
else {
$self->inline($self->content);
$key = $self->_parse_inline();
$key = "$key";
$self->content($self->inline);
$self->inline('');
}
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unless ($self->{content} =~ s/^:\s*//) {
$self->die('YAML_LOAD_ERR_BAD_MAP_ELEMENT');
}
$self->preface($self->content);
my $line = $self->line;
$self->_parse_next_line(COLLECTION);
my $value = $self->_parse_node();
if (exists $mapping->{$key}) {
$self->warn('YAML_LOAD_WARN_DUPLICATE_KEY');
}
else {
$mapping->{$key} = $value;
}
}
return $mapping;
}

# Parse a YAML sequence into a Perl array
sub _parse_seq {
my $self = shift;
my ($anchor) = @_;
my $seq = [];
$self->anchor2node->{$anchor} = $seq;
while (not $self->done and $self->indent == $self->offset->[$self->level]) {
if ($self->content =~ /^-(?: (.*))?$/) {
$self->preface(defined($1) ? $1 : '');
}
else {
$self->die('YAML_LOAD_ERR_BAD_SEQ_ELEMENT');
}
if ($self->preface =~ /^(\s*)(\w.*\:(?: |$).*)$/) {
$self->indent($self->offset->[$self->level] + 2 + length($1));
$self->content($2);
$self->level($self->level + 1);
$self->offset->[$self->level] = $self->indent;
$self->preface('');
push @$seq, $self->_parse_mapping('');
$self->{level}--;
$#{$self->offset} = $self->level;
}
else {
$self->_parse_next_line(COLLECTION);
push @$seq, $self->_parse_node();
}
}
return $seq;
}

# Parse an inline value. Since YAML supports inline collections, this is
# the top level of a sub parsing.
sub _parse_inline {
my $self = shift;
my ($top, $top_implicit, $top_explicit) = (@_, '', '', '');
$self->{inline} =~ s/^\s*(.*)\s*$/$1/; # OUCH - mugwump
my ($node, $anchor, $alias, $explicit, $implicit) = ('') x 5;
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($anchor, $alias, $explicit, $implicit, $self->{inline}) =
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$self->_parse_qualifiers($self->inline);
if ($anchor) {
$self->anchor2node->{$anchor} = CORE::bless [], 'YAML-anchor2node';
}
$implicit ||= $top_implicit;
$explicit ||= $top_explicit;
($top_implicit, $top_explicit) = ('', '');
if ($alias) {
$self->die('YAML_PARSE_ERR_NO_ANCHOR', $alias)
unless defined $self->anchor2node->{$alias};
if (ref($self->anchor2node->{$alias}) ne 'YAML-anchor2node') {
$node = $self->anchor2node->{$alias};
}
else {
$node = do {my $sv = "*$alias"};
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push @{$self->anchor2node->{$alias}}, [\$node, $self->line];
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}
}
elsif ($self->inline =~ /^\{/) {
$node = $self->_parse_inline_mapping($anchor);
}
elsif ($self->inline =~ /^\[/) {
$node = $self->_parse_inline_seq($anchor);
}
elsif ($self->inline =~ /^"/) {
$node = $self->_parse_inline_double_quoted();
$node = $self->_unescape($node);
$node = $self->_parse_implicit($node) if $implicit;
}
elsif ($self->inline =~ /^'/) {
$node = $self->_parse_inline_single_quoted();
$node = $self->_parse_implicit($node) if $implicit;
}
else {
if ($top) {
$node = $self->inline;
$self->inline('');
}
else {
$node = $self->_parse_inline_simple();
}
$node = $self->_parse_implicit($node) unless $explicit;
}
if ($explicit) {
$node = $self->_parse_explicit($node, $explicit);
}
if ($anchor) {
if (ref($self->anchor2node->{$anchor}) eq 'YAML-anchor2node') {
for my $ref (@{$self->anchor2node->{$anchor}}) {
${$ref->[0]} = $node;
$self->warn('YAML_LOAD_WARN_UNRESOLVED_ALIAS',
$anchor, $ref->[1]);
}
}
$self->anchor2node->{$anchor} = $node;
}
return $node;
}

# Parse the inline YAML mapping into a Perl hash
sub _parse_inline_mapping {
my $self = shift;
my ($anchor) = @_;
my $node = {};
$self->anchor2node->{$anchor} = $node;

$self->die('YAML_PARSE_ERR_INLINE_MAP')
unless $self->{inline} =~ s/^\{\s*//;
while (not $self->{inline} =~ s/^\s*\}//) {
my $key = $self->_parse_inline();
$self->die('YAML_PARSE_ERR_INLINE_MAP')
unless $self->{inline} =~ s/^\: \s*//;
my $value = $self->_parse_inline();
if (exists $node->{$key}) {
$self->warn('YAML_LOAD_WARN_DUPLICATE_KEY');
}
else {
$node->{$key} = $value;
}
next if $self->inline =~ /^\s*\}/;
$self->die('YAML_PARSE_ERR_INLINE_MAP')
unless $self->{inline} =~ s/^\,\s*//;
}
return $node;
}

# Parse the inline YAML sequence into a Perl array
sub _parse_inline_seq {
my $self = shift;
my ($anchor) = @_;
my $node = [];
$self->anchor2node->{$anchor} = $node;

$self->die('YAML_PARSE_ERR_INLINE_SEQUENCE')
unless $self->{inline} =~ s/^\[\s*//;
while (not $self->{inline} =~ s/^\s*\]//) {
my $value = $self->_parse_inline();
push @$node, $value;
next if $self->inline =~ /^\s*\]/;
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$self->die('YAML_PARSE_ERR_INLINE_SEQUENCE')
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unless $self->{inline} =~ s/^\,\s*//;
}
return $node;
}

# Parse the inline double quoted string.
sub _parse_inline_double_quoted {
my $self = shift;
my $node;
if ($self->inline =~ /^"((?:\\"|[^"])*)"\s*(.*)$/) {
$node = $1;
$self->inline($2);
$node =~ s/\\"/"/g;
}
else {
$self->die('YAML_PARSE_ERR_BAD_DOUBLE');
}
return $node;
}


# Parse the inline single quoted string.
sub _parse_inline_single_quoted {
my $self = shift;
my $node;
if ($self->inline =~ /^'((?:''|[^'])*)'\s*(.*)$/) {
$node = $1;
$self->inline($2);
$node =~ s/''/'/g;
}
else {
$self->die('YAML_PARSE_ERR_BAD_SINGLE');
}
return $node;
}

# Parse the inline unquoted string and do implicit typing.
sub _parse_inline_simple {
my $self = shift;
my $value;
if ($self->inline =~ /^(|[^!@#%^&*].*?)(?=[\[\]\{\},]|, |: |- |:\s*$|$)/) {
$value = $1;
substr($self->{inline}, 0, length($1)) = '';
}
else {
$self->die('YAML_PARSE_ERR_BAD_INLINE_IMPLICIT', $value);
}
return $value;
}

sub _parse_implicit {
my $self = shift;
my ($value) = @_;
$value =~ s/\s*$//;
return $value if $value eq '';
return undef if $value =~ /^~$/;
return $value
unless $value =~ /^[\@\`\^]/ or
$value =~ /^[\-\?]\s/;
$self->die('YAML_PARSE_ERR_BAD_IMPLICIT', $value);
}

# Unfold a YAML multiline scalar into a single string.
sub _parse_unfold {
my $self = shift;
my ($chomp) = @_;
my $node = '';
my $space = 0;
while (not $self->done and $self->indent == $self->offset->[$self->level]) {
$node .= $self->content. "\n";
$self->_parse_next_line(LEAF);
}
$node =~ s/^(\S.*)\n(?=\S)/$1 /gm;
$node =~ s/^(\S.*)\n(\n+\S)/$1$2/gm;
$node =~ s/\n*\Z// unless $chomp eq '+';
$node .= "\n" unless $chomp;
return $node;
}

# Parse a YAML block style scalar. This is like a Perl here-document.
sub _parse_block {
my $self = shift;
my ($chomp) = @_;
my $node = '';
while (not $self->done and $self->indent == $self->offset->[$self->level]) {
$node .= $self->content . "\n";
$self->_parse_next_line(LEAF);
}
return $node if '+' eq $chomp;
$node =~ s/\n*\Z/\n/;
$node =~ s/\n\Z// if $chomp eq '-';
return $node;
}

# Handle Perl style '#' comments. Comments must be at the same indentation
# level as the collection line following them.
sub _parse_throwaway_comments {
my $self = shift;
while (@{$self->lines} and
$self->lines->[0] =~ m{^\s*(\#|$)}
) {
shift @{$self->lines};
$self->{line}++;
}
$self->eos($self->{done} = not @{$self->lines});
}

# This is the routine that controls what line is being parsed. It gets called
# once for each line in the YAML stream.
#
# This routine must:
# 1) Skip past the current line
# 2) Determine the indentation offset for a new level
# 3) Find the next _content_ line
# A) Skip over any throwaways (Comments/blanks)
# B) Set $self->indent, $self->content, $self->line
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# 4) Expand tabs appropriately
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sub _parse_next_line {
my $self = shift;
my ($type) = @_;
my $level = $self->level;
my $offset = $self->offset->[$level];
$self->die('YAML_EMIT_ERR_BAD_LEVEL') unless defined $offset;
shift @{$self->lines};
$self->eos($self->{done} = not @{$self->lines});
return if $self->eos;
$self->{line}++;

# Determine the offset for a new leaf node
if ($self->preface =~
qr/(?:^|\s)(?:$FOLD_CHAR|$LIT_CHAR_RX)(?:-|\+)?(\d*)\s*$/
) {
$self->die('YAML_PARSE_ERR_ZERO_INDENT')
if length($1) and $1 == 0;
$type = LEAF;
if (length($1)) {
$self->offset->[$level + 1] = $offset + $1;
}
else {
# First get rid of any comments.
while (@{$self->lines} && ($self->lines->[0] =~ /^\s*#/)) {
$self->lines->[0] =~ /^( *)/ or die;
last unless length($1) <= $offset;
shift @{$self->lines};
$self->{line}++;
}
$self->eos($self->{done} = not @{$self->lines});
return if $self->eos;
if ($self->lines->[0] =~ /^( *)\S/ and length($1) > $offset) {
$self->offset->[$level+1] = length($1);
}
else {
$self->offset->[$level+1] = $offset + 1;
}
}
$offset = $self->offset->[++$level];
}
# Determine the offset for a new collection level
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elsif ($type == COLLECTION and
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$self->preface =~ /^(\s*(\!\S*|\&\S+))*\s*$/) {
$self->_parse_throwaway_comments();
if ($self->eos) {
$self->offset->[$level+1] = $offset + 1;
return;
}
else {
$self->lines->[0] =~ /^( *)\S/ or die;
if (length($1) > $offset) {
$self->offset->[$level+1] = length($1);
}
else {
$self->offset->[$level+1] = $offset + 1;
}
}
$offset = $self->offset->[++$level];
}
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if ($type == LEAF) {
while (@{$self->lines} and
$self->lines->[0] =~ m{^( *)(\#)} and
length($1) < $offset
) {
shift @{$self->lines};
$self->{line}++;
}
$self->eos($self->{done} = not @{$self->lines});
}
else {
$self->_parse_throwaway_comments();
}
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return if $self->eos;

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if ($self->lines->[0] =~ /^---(\s|$)/) {
$self->done(1);
return;
}
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if ($type == LEAF and
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$self->lines->[0] =~ /^ {$offset}(.*)$/
) {
$self->indent($offset);
$self->content($1);
}
elsif ($self->lines->[0] =~ /^\s*$/) {
$self->indent($offset);
$self->content('');
}
else {
$self->lines->[0] =~ /^( *)(\S.*)$/;
while ($self->offset->[$level] > length($1)) {
$level--;
}
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$self->die('YAML_PARSE_ERR_INCONSISTENT_INDENTATION')
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if $self->offset->[$level] != length($1);
$self->indent(length($1));
$self->content($2);
}
$self->die('YAML_PARSE_ERR_INDENTATION')
if $self->indent - $offset > 1;
}

#==============================================================================
# Utility subroutines.
#==============================================================================

# Printable characters for escapes
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my %unescapes =
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(
z => "\x00", a => "\x07", t => "\x09",
n => "\x0a", v => "\x0b", f => "\x0c",
r => "\x0d", e => "\x1b", '\\' => '\\',
);
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# Transform all the backslash style escape characters to their literal meaning
sub _unescape {
my $self = shift;
my ($node) = @_;
$node =~ s/\\([never\\fartz]|x([0-9a-fA-F]{2}))/
(length($1)>1)?pack("H2",$2):$unescapes{$1}/gex;
return $node;
}

1;

__END__

=head1 NAME

YAML::Loader - YAML class for loading Perl objects to YAML

=head1 SYNOPSIS

use YAML::Loader;
my $loader = YAML::Loader->new;
my $hash = $loader->load(<<'...');
foo: bar
...

=head1 DESCRIPTION

YAML::Loader is the module that YAML.pm used to deserialize YAML to Perl
objects. It is fully object oriented and usable on its own.

=head1 AUTHOR

Ingy döt Net <ingy@cpan.org>

=head1 COPYRIGHT

Copyright (c) 2006. Ingy döt Net. All rights reserved.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

See L<http://www.perl.com/perl/misc/Artistic.html>

=cut