package parse

import (
	"git.makaay.nl/mauricem/go-parsekit/parse"
	"git.makaay.nl/mauricem/go-parsekit/tokenize"
	"git.makaay.nl/mauricem/go-toml/ast"
)

// Some globally useful tokenizer definitions.
var (
	c, a, m, tok = tokenize.C, tokenize.A, tokenize.M, tokenize.T

	// Whitespace means tab (0x09) or space (0x20).
	// The matches the blanks as defined by parsekit.

	whitespace = a.Blanks.Optional()

	// Newline means LF (0x0A) or CRLF (0x0D0A).
	// This matches the newline as defined by parsekit.

	newline = a.Newline

	// Whitespace + newlines.
	// This matches the whitespace as defined by parsekit.

	whitespaceInclNewlines = a.Whitespace

	// A '#' hash symbol marks the rest of the line as a comment.
	// All characters up to the end of the line are included in the comment.

	comment         = c.Seq(a.Hash, a.UntilEndOfLine)
	optionalComment = comment.Optional()

	endOfLineOrComment  = c.Seq(whitespace, optionalComment, a.EndOfLine)
	whitespaceOrComment = c.ZeroOrMore(whitespaceInclNewlines.Or(comment))
)

type parser struct {
	doc *ast.Document
}

func newParser() *parser {
	doc := ast.NewDocument()
	return &parser{doc}
}

// Run the TOML parser against the provided input data.
//
// For an overview of allowed inputs, take a look at the documentation for
// parsekit.read.New(). At the time of writing, you can make use of
// strings, types implementing io.Reader and bufio.Readers.
//
// This function returns a TOML abstract syntax table structure and an
// error (or nil when no error occurred). When an error occurred, the
// TOML ast struct will contain the data that could be parsed up to the error.
func Run(input interface{}) (ast.Table, error) {
	p := newParser()
	err := parse.New(p.startDocument)(input)
	return p.doc.Root, err
}

// RunWithoutSanityChecks runs the TOML parser against the provided input data.
// The parsekit sanity checks are disabled during the parse run.
func RunWithoutSanityChecks(input interface{}) (ast.Table, error) {
	p := newParser()
	err := parse.NewWithoutSanityChecks(p.startDocument)(input)
	return p.doc.Root, err
}