//

// Copyright (c) 2011-2019 Canonical Ltd

// Copyright (c) 2006-2010 Kirill Simonov

//

// Permission is hereby granted, free of charge, to any person obtaining a copy of

// this software and associated documentation files (the "Software"), to deal in

// the Software without restriction, including without limitation the rights to

// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies

// of the Software, and to permit persons to whom the Software is furnished to do

// so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package yaml

import (

	"fmt"

	"io"

)

// The version directive data.

type yaml_version_directive_t struct {

	major int8 // The major version number.

	minor int8 // The minor version number.

}

// The tag directive data.

type yaml_tag_directive_t struct {

	handle []byte // The tag handle.

	prefix []byte // The tag prefix.

}

type yaml_encoding_t int

// The stream encoding.

const (

	// Let the parser choose the encoding.

	yaml_ANY_ENCODING yaml_encoding_t = iota

	yaml_UTF8_ENCODING    // The default UTF-8 encoding.

	yaml_UTF16LE_ENCODING // The UTF-16-LE encoding with BOM.

	yaml_UTF16BE_ENCODING // The UTF-16-BE encoding with BOM.

)

type yaml_break_t int

// Line break types.

const (

	// Let the parser choose the break type.

	yaml_ANY_BREAK yaml_break_t = iota

	yaml_CR_BREAK   // Use CR for line breaks (Mac style).

	yaml_LN_BREAK   // Use LN for line breaks (Unix style).

	yaml_CRLN_BREAK // Use CR LN for line breaks (DOS style).

)

type yaml_error_type_t int

// Many bad things could happen with the parser and emitter.

const (

	// No error is produced.

	yaml_NO_ERROR yaml_error_type_t = iota

	yaml_MEMORY_ERROR   // Cannot allocate or reallocate a block of memory.

	yaml_READER_ERROR   // Cannot read or decode the input stream.

	yaml_SCANNER_ERROR  // Cannot scan the input stream.

	yaml_PARSER_ERROR   // Cannot parse the input stream.

	yaml_COMPOSER_ERROR // Cannot compose a YAML document.

	yaml_WRITER_ERROR   // Cannot write to the output stream.

	yaml_EMITTER_ERROR  // Cannot emit a YAML stream.

)

// The pointer position.

type yaml_mark_t struct {

	index  int // The position index.

	line   int // The position line.

	column int // The position column.

}

// Node Styles

type yaml_style_t int8

type yaml_scalar_style_t yaml_style_t

// Scalar styles.

const (

	// Let the emitter choose the style.

	yaml_ANY_SCALAR_STYLE yaml_scalar_style_t = 0

	yaml_PLAIN_SCALAR_STYLE         yaml_scalar_style_t = 1 << iota // The plain scalar style.

	yaml_SINGLE_QUOTED_SCALAR_STYLE                                 // The single-quoted scalar style.

	yaml_DOUBLE_QUOTED_SCALAR_STYLE                                 // The double-quoted scalar style.

	yaml_LITERAL_SCALAR_STYLE                                       // The literal scalar style.

	yaml_FOLDED_SCALAR_STYLE                                        // The folded scalar style.

)

type yaml_sequence_style_t yaml_style_t

// Sequence styles.

const (

	// Let the emitter choose the style.

	yaml_ANY_SEQUENCE_STYLE yaml_sequence_style_t = iota

	yaml_BLOCK_SEQUENCE_STYLE // The block sequence style.

	yaml_FLOW_SEQUENCE_STYLE  // The flow sequence style.

)

type yaml_mapping_style_t yaml_style_t

// Mapping styles.

const (

	// Let the emitter choose the style.

	yaml_ANY_MAPPING_STYLE yaml_mapping_style_t = iota

	yaml_BLOCK_MAPPING_STYLE // The block mapping style.

	yaml_FLOW_MAPPING_STYLE  // The flow mapping style.

)

// Tokens

type yaml_token_type_t int

// Token types.

const (

	// An empty token.

	yaml_NO_TOKEN yaml_token_type_t = iota

	yaml_STREAM_START_TOKEN // A STREAM-START token.

	yaml_STREAM_END_TOKEN   // A STREAM-END token.

	yaml_VERSION_DIRECTIVE_TOKEN // A VERSION-DIRECTIVE token.

	yaml_TAG_DIRECTIVE_TOKEN     // A TAG-DIRECTIVE token.

	yaml_DOCUMENT_START_TOKEN    // A DOCUMENT-START token.

	yaml_DOCUMENT_END_TOKEN      // A DOCUMENT-END token.

	yaml_BLOCK_SEQUENCE_START_TOKEN // A BLOCK-SEQUENCE-START token.

	yaml_BLOCK_MAPPING_START_TOKEN  // A BLOCK-SEQUENCE-END token.

	yaml_BLOCK_END_TOKEN            // A BLOCK-END token.

	yaml_FLOW_SEQUENCE_START_TOKEN // A FLOW-SEQUENCE-START token.

	yaml_FLOW_SEQUENCE_END_TOKEN   // A FLOW-SEQUENCE-END token.

	yaml_FLOW_MAPPING_START_TOKEN  // A FLOW-MAPPING-START token.

	yaml_FLOW_MAPPING_END_TOKEN    // A FLOW-MAPPING-END token.

	yaml_BLOCK_ENTRY_TOKEN // A BLOCK-ENTRY token.

	yaml_FLOW_ENTRY_TOKEN  // A FLOW-ENTRY token.

	yaml_KEY_TOKEN         // A KEY token.

	yaml_VALUE_TOKEN       // A VALUE token.

	yaml_ALIAS_TOKEN  // An ALIAS token.

	yaml_ANCHOR_TOKEN // An ANCHOR token.

	yaml_TAG_TOKEN    // A TAG token.

	yaml_SCALAR_TOKEN // A SCALAR token.

)

func (tt yaml_token_type_t) String() string {

	switch tt {

	case yaml_NO_TOKEN:

		return "yaml_NO_TOKEN"

	case yaml_STREAM_START_TOKEN:

		return "yaml_STREAM_START_TOKEN"

	case yaml_STREAM_END_TOKEN:

		return "yaml_STREAM_END_TOKEN"

	case yaml_VERSION_DIRECTIVE_TOKEN:

		return "yaml_VERSION_DIRECTIVE_TOKEN"

	case yaml_TAG_DIRECTIVE_TOKEN:

		return "yaml_TAG_DIRECTIVE_TOKEN"

	case yaml_DOCUMENT_START_TOKEN:

		return "yaml_DOCUMENT_START_TOKEN"

	case yaml_DOCUMENT_END_TOKEN:

		return "yaml_DOCUMENT_END_TOKEN"

	case yaml_BLOCK_SEQUENCE_START_TOKEN:

		return "yaml_BLOCK_SEQUENCE_START_TOKEN"

	case yaml_BLOCK_MAPPING_START_TOKEN:

		return "yaml_BLOCK_MAPPING_START_TOKEN"

	case yaml_BLOCK_END_TOKEN:

		return "yaml_BLOCK_END_TOKEN"

	case yaml_FLOW_SEQUENCE_START_TOKEN:

		return "yaml_FLOW_SEQUENCE_START_TOKEN"

	case yaml_FLOW_SEQUENCE_END_TOKEN:

		return "yaml_FLOW_SEQUENCE_END_TOKEN"

	case yaml_FLOW_MAPPING_START_TOKEN:

		return "yaml_FLOW_MAPPING_START_TOKEN"

	case yaml_FLOW_MAPPING_END_TOKEN:

		return "yaml_FLOW_MAPPING_END_TOKEN"

	case yaml_BLOCK_ENTRY_TOKEN:

		return "yaml_BLOCK_ENTRY_TOKEN"

	case yaml_FLOW_ENTRY_TOKEN:

		return "yaml_FLOW_ENTRY_TOKEN"

	case yaml_KEY_TOKEN:

		return "yaml_KEY_TOKEN"

	case yaml_VALUE_TOKEN:

		return "yaml_VALUE_TOKEN"

	case yaml_ALIAS_TOKEN:

		return "yaml_ALIAS_TOKEN"

	case yaml_ANCHOR_TOKEN:

		return "yaml_ANCHOR_TOKEN"

	case yaml_TAG_TOKEN:

		return "yaml_TAG_TOKEN"

	case yaml_SCALAR_TOKEN:

		return "yaml_SCALAR_TOKEN"

	}

	return "<unknown token>"

}

// The token structure.

type yaml_token_t struct {

	// The token type.

	typ yaml_token_type_t

	// The start/end of the token.

	start_mark, end_mark yaml_mark_t

	// The stream encoding (for yaml_STREAM_START_TOKEN).

	encoding yaml_encoding_t

	// The alias/anchor/scalar value or tag/tag directive handle

	// (for yaml_ALIAS_TOKEN, yaml_ANCHOR_TOKEN, yaml_SCALAR_TOKEN, yaml_TAG_TOKEN, yaml_TAG_DIRECTIVE_TOKEN).

	value []byte

	// The tag suffix (for yaml_TAG_TOKEN).

	suffix []byte

	// The tag directive prefix (for yaml_TAG_DIRECTIVE_TOKEN).

	prefix []byte

	// The scalar style (for yaml_SCALAR_TOKEN).

	style yaml_scalar_style_t

	// The version directive major/minor (for yaml_VERSION_DIRECTIVE_TOKEN).

	major, minor int8

}

// Events

type yaml_event_type_t int8

// Event types.

const (

	// An empty event.

	yaml_NO_EVENT yaml_event_type_t = iota

	yaml_STREAM_START_EVENT   // A STREAM-START event.

	yaml_STREAM_END_EVENT     // A STREAM-END event.

	yaml_DOCUMENT_START_EVENT // A DOCUMENT-START event.

	yaml_DOCUMENT_END_EVENT   // A DOCUMENT-END event.

	yaml_ALIAS_EVENT          // An ALIAS event.

	yaml_SCALAR_EVENT         // A SCALAR event.

	yaml_SEQUENCE_START_EVENT // A SEQUENCE-START event.

	yaml_SEQUENCE_END_EVENT   // A SEQUENCE-END event.

	yaml_MAPPING_START_EVENT  // A MAPPING-START event.

	yaml_MAPPING_END_EVENT    // A MAPPING-END event.

	yaml_TAIL_COMMENT_EVENT

)

var eventStrings = []string{

	yaml_NO_EVENT:             "none",

	yaml_STREAM_START_EVENT:   "stream start",

	yaml_STREAM_END_EVENT:     "stream end",

	yaml_DOCUMENT_START_EVENT: "document start",

	yaml_DOCUMENT_END_EVENT:   "document end",

	yaml_ALIAS_EVENT:          "alias",

	yaml_SCALAR_EVENT:         "scalar",

	yaml_SEQUENCE_START_EVENT: "sequence start",

	yaml_SEQUENCE_END_EVENT:   "sequence end",

	yaml_MAPPING_START_EVENT:  "mapping start",

	yaml_MAPPING_END_EVENT:    "mapping end",

	yaml_TAIL_COMMENT_EVENT:   "tail comment",

}

func (e yaml_event_type_t) String() string {

	if e < 0 || int(e) >= len(eventStrings) {

		return fmt.Sprintf("unknown event %d", e)

	}

	return eventStrings[e]

}

// The event structure.

type yaml_event_t struct {

	// The event type.

	typ yaml_event_type_t

	// The start and end of the event.

	start_mark, end_mark yaml_mark_t

	// The document encoding (for yaml_STREAM_START_EVENT).

	encoding yaml_encoding_t

	// The version directive (for yaml_DOCUMENT_START_EVENT).

	version_directive *yaml_version_directive_t

	// The list of tag directives (for yaml_DOCUMENT_START_EVENT).

	tag_directives []yaml_tag_directive_t

	// The comments

	head_comment []byte

	line_comment []byte

	foot_comment []byte

	tail_comment []byte

	// The anchor (for yaml_SCALAR_EVENT, yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT, yaml_ALIAS_EVENT).

	anchor []byte

	// The tag (for yaml_SCALAR_EVENT, yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT).

	tag []byte

	// The scalar value (for yaml_SCALAR_EVENT).

	value []byte

	// Is the document start/end indicator implicit, or the tag optional?

	// (for yaml_DOCUMENT_START_EVENT, yaml_DOCUMENT_END_EVENT, yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT, yaml_SCALAR_EVENT).

	implicit bool

	// Is the tag optional for any non-plain style? (for yaml_SCALAR_EVENT).

	quoted_implicit bool

	// The style (for yaml_SCALAR_EVENT, yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT).

	style yaml_style_t

}

func (e *yaml_event_t) scalar_style() yaml_scalar_style_t     { return yaml_scalar_style_t(e.style) }

func (e *yaml_event_t) sequence_style() yaml_sequence_style_t { return yaml_sequence_style_t(e.style) }

func (e *yaml_event_t) mapping_style() yaml_mapping_style_t   { return yaml_mapping_style_t(e.style) }

// Nodes

const (

	yaml_NULL_TAG      = "tag:yaml.org,2002:null"      // The tag !!null with the only possible value: null.

	yaml_BOOL_TAG      = "tag:yaml.org,2002:bool"      // The tag !!bool with the values: true and false.

	yaml_STR_TAG       = "tag:yaml.org,2002:str"       // The tag !!str for string values.

	yaml_INT_TAG       = "tag:yaml.org,2002:int"       // The tag !!int for integer values.

	yaml_FLOAT_TAG     = "tag:yaml.org,2002:float"     // The tag !!float for float values.

	yaml_TIMESTAMP_TAG = "tag:yaml.org,2002:timestamp" // The tag !!timestamp for date and time values.

	yaml_SEQ_TAG = "tag:yaml.org,2002:seq" // The tag !!seq is used to denote sequences.

	yaml_MAP_TAG = "tag:yaml.org,2002:map" // The tag !!map is used to denote mapping.

	// Not in original libyaml.

	yaml_BINARY_TAG = "tag:yaml.org,2002:binary"

	yaml_MERGE_TAG  = "tag:yaml.org,2002:merge"

	yaml_DEFAULT_SCALAR_TAG   = yaml_STR_TAG // The default scalar tag is !!str.

	yaml_DEFAULT_SEQUENCE_TAG = yaml_SEQ_TAG // The default sequence tag is !!seq.

	yaml_DEFAULT_MAPPING_TAG  = yaml_MAP_TAG // The default mapping tag is !!map.

)

type yaml_node_type_t int

// Node types.

const (

	// An empty node.

	yaml_NO_NODE yaml_node_type_t = iota

	yaml_SCALAR_NODE   // A scalar node.

	yaml_SEQUENCE_NODE // A sequence node.

	yaml_MAPPING_NODE  // A mapping node.

)

// An element of a sequence node.

type yaml_node_item_t int

// An element of a mapping node.

type yaml_node_pair_t struct {

	key   int // The key of the element.

	value int // The value of the element.

}

// The node structure.

type yaml_node_t struct {

	typ yaml_node_type_t // The node type.

	tag []byte           // The node tag.

	// The node data.

	// The scalar parameters (for yaml_SCALAR_NODE).

	scalar struct {

		value  []byte              // The scalar value.

		length int                 // The length of the scalar value.

		style  yaml_scalar_style_t // The scalar style.

	}

	// The sequence parameters (for YAML_SEQUENCE_NODE).

	sequence struct {

		items_data []yaml_node_item_t    // The stack of sequence items.

		style      yaml_sequence_style_t // The sequence style.

	}

	// The mapping parameters (for yaml_MAPPING_NODE).

	mapping struct {

		pairs_data  []yaml_node_pair_t   // The stack of mapping pairs (key, value).

		pairs_start *yaml_node_pair_t    // The beginning of the stack.

		pairs_end   *yaml_node_pair_t    // The end of the stack.

		pairs_top   *yaml_node_pair_t    // The top of the stack.

		style       yaml_mapping_style_t // The mapping style.

	}

	start_mark yaml_mark_t // The beginning of the node.

	end_mark   yaml_mark_t // The end of the node.

}

// The document structure.

type yaml_document_t struct {

	// The document nodes.

	nodes []yaml_node_t

	// The version directive.

	version_directive *yaml_version_directive_t

	// The list of tag directives.

	tag_directives_data  []yaml_tag_directive_t

	tag_directives_start int // The beginning of the tag directives list.

	tag_directives_end   int // The end of the tag directives list.

	start_implicit int // Is the document start indicator implicit?

	end_implicit   int // Is the document end indicator implicit?

	// The start/end of the document.

	start_mark, end_mark yaml_mark_t

}

// The prototype of a read handler.

//

// The read handler is called when the parser needs to read more bytes from the

// source. The handler should write not more than size bytes to the buffer.

// The number of written bytes should be set to the size_read variable.

//

// [in,out]   data        A pointer to an application data specified by

//                        yaml_parser_set_input().

// [out]      buffer      The buffer to write the data from the source.

// [in]       size        The size of the buffer.

// [out]      size_read   The actual number of bytes read from the source.

//

// On success, the handler should return 1.  If the handler failed,

// the returned value should be 0. On EOF, the handler should set the

// size_read to 0 and return 1.

type yaml_read_handler_t func(parser *yaml_parser_t, buffer []byte) (n int, err error)

// This structure holds information about a potential simple key.

type yaml_simple_key_t struct {

	possible     bool        // Is a simple key possible?

	required     bool        // Is a simple key required?

	token_number int         // The number of the token.

	mark         yaml_mark_t // The position mark.

}

// The states of the parser.

type yaml_parser_state_t int

const (

	yaml_PARSE_STREAM_START_STATE yaml_parser_state_t = iota

	yaml_PARSE_IMPLICIT_DOCUMENT_START_STATE           // Expect the beginning of an implicit document.

	yaml_PARSE_DOCUMENT_START_STATE                    // Expect DOCUMENT-START.

	yaml_PARSE_DOCUMENT_CONTENT_STATE                  // Expect the content of a document.