1148 lines
24 KiB
Go
1148 lines
24 KiB
Go
package unstable
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import (
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"bytes"
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"fmt"
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"unicode"
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"github.com/pelletier/go-toml/v2/internal/characters"
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"github.com/pelletier/go-toml/v2/internal/danger"
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)
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// ParserError describes an error relative to the content of the document.
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//
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// It cannot outlive the instance of Parser it refers to, and may cause panics
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// if the parser is reset.
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type ParserError struct {
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Highlight []byte
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Message string
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Key []string // optional
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}
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// Error is the implementation of the error interface.
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func (e *ParserError) Error() string {
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return e.Message
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}
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// NewParserError is a convenience function to create a ParserError
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//
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// Warning: Highlight needs to be a subslice of Parser.data, so only slices
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// returned by Parser.Raw are valid candidates.
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func NewParserError(highlight []byte, format string, args ...interface{}) error {
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return &ParserError{
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Highlight: highlight,
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Message: fmt.Errorf(format, args...).Error(),
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}
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}
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// Parser scans over a TOML-encoded document and generates an iterative AST.
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//
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// To prime the Parser, first reset it with the contents of a TOML document.
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// Then, process all top-level expressions sequentially. See Example.
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//
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// Don't forget to check Error() after you're done parsing.
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//
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// Each top-level expression needs to be fully processed before calling
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// NextExpression() again. Otherwise, calls to various Node methods may panic if
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// the parser has moved on the next expression.
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//
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// For performance reasons, go-toml doesn't make a copy of the input bytes to
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// the parser. Make sure to copy all the bytes you need to outlive the slice
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// given to the parser.
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//
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// The parser doesn't provide nodes for comments yet, nor for whitespace.
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type Parser struct {
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data []byte
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builder builder
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ref reference
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left []byte
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err error
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first bool
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}
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// Data returns the slice provided to the last call to Reset.
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func (p *Parser) Data() []byte {
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return p.data
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}
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// Range returns a range description that corresponds to a given slice of the
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// input. If the argument is not a subslice of the parser input, this function
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// panics.
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func (p *Parser) Range(b []byte) Range {
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return Range{
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Offset: uint32(danger.SubsliceOffset(p.data, b)),
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Length: uint32(len(b)),
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}
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}
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// Raw returns the slice corresponding to the bytes in the given range.
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func (p *Parser) Raw(raw Range) []byte {
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return p.data[raw.Offset : raw.Offset+raw.Length]
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}
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// Reset brings the parser to its initial state for a given input. It wipes an
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// reuses internal storage to reduce allocation.
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func (p *Parser) Reset(b []byte) {
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p.builder.Reset()
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p.ref = invalidReference
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p.data = b
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p.left = b
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p.err = nil
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p.first = true
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}
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// NextExpression parses the next top-level expression. If an expression was
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// successfully parsed, it returns true. If the parser is at the end of the
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// document or an error occurred, it returns false.
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//
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// Retrieve the parsed expression with Expression().
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func (p *Parser) NextExpression() bool {
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if len(p.left) == 0 || p.err != nil {
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return false
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}
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p.builder.Reset()
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p.ref = invalidReference
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for {
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if len(p.left) == 0 || p.err != nil {
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return false
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}
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if !p.first {
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p.left, p.err = p.parseNewline(p.left)
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}
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if len(p.left) == 0 || p.err != nil {
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return false
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}
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p.ref, p.left, p.err = p.parseExpression(p.left)
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if p.err != nil {
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return false
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}
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p.first = false
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if p.ref.Valid() {
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return true
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}
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}
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}
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// Expression returns a pointer to the node representing the last successfully
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// parsed expresion.
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func (p *Parser) Expression() *Node {
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return p.builder.NodeAt(p.ref)
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}
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// Error returns any error that has occured during parsing.
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func (p *Parser) Error() error {
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return p.err
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}
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func (p *Parser) parseNewline(b []byte) ([]byte, error) {
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if b[0] == '\n' {
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return b[1:], nil
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}
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if b[0] == '\r' {
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_, rest, err := scanWindowsNewline(b)
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return rest, err
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}
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return nil, NewParserError(b[0:1], "expected newline but got %#U", b[0])
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}
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func (p *Parser) parseExpression(b []byte) (reference, []byte, error) {
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// expression = ws [ comment ]
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// expression =/ ws keyval ws [ comment ]
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// expression =/ ws table ws [ comment ]
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ref := invalidReference
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b = p.parseWhitespace(b)
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if len(b) == 0 {
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return ref, b, nil
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}
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if b[0] == '#' {
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_, rest, err := scanComment(b)
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return ref, rest, err
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}
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if b[0] == '\n' || b[0] == '\r' {
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return ref, b, nil
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}
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var err error
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if b[0] == '[' {
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ref, b, err = p.parseTable(b)
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} else {
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ref, b, err = p.parseKeyval(b)
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}
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if err != nil {
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return ref, nil, err
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}
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b = p.parseWhitespace(b)
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if len(b) > 0 && b[0] == '#' {
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_, rest, err := scanComment(b)
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return ref, rest, err
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}
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return ref, b, nil
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}
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func (p *Parser) parseTable(b []byte) (reference, []byte, error) {
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// table = std-table / array-table
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if len(b) > 1 && b[1] == '[' {
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return p.parseArrayTable(b)
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}
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return p.parseStdTable(b)
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}
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func (p *Parser) parseArrayTable(b []byte) (reference, []byte, error) {
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// array-table = array-table-open key array-table-close
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// array-table-open = %x5B.5B ws ; [[ Double left square bracket
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// array-table-close = ws %x5D.5D ; ]] Double right square bracket
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ref := p.builder.Push(Node{
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Kind: ArrayTable,
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})
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b = b[2:]
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b = p.parseWhitespace(b)
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k, b, err := p.parseKey(b)
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if err != nil {
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return ref, nil, err
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}
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p.builder.AttachChild(ref, k)
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b = p.parseWhitespace(b)
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b, err = expect(']', b)
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if err != nil {
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return ref, nil, err
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}
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b, err = expect(']', b)
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return ref, b, err
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}
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func (p *Parser) parseStdTable(b []byte) (reference, []byte, error) {
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// std-table = std-table-open key std-table-close
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// std-table-open = %x5B ws ; [ Left square bracket
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// std-table-close = ws %x5D ; ] Right square bracket
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ref := p.builder.Push(Node{
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Kind: Table,
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})
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b = b[1:]
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b = p.parseWhitespace(b)
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key, b, err := p.parseKey(b)
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if err != nil {
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return ref, nil, err
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}
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p.builder.AttachChild(ref, key)
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b = p.parseWhitespace(b)
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b, err = expect(']', b)
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return ref, b, err
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}
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func (p *Parser) parseKeyval(b []byte) (reference, []byte, error) {
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// keyval = key keyval-sep val
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ref := p.builder.Push(Node{
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Kind: KeyValue,
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})
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key, b, err := p.parseKey(b)
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if err != nil {
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return invalidReference, nil, err
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}
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// keyval-sep = ws %x3D ws ; =
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b = p.parseWhitespace(b)
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if len(b) == 0 {
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return invalidReference, nil, NewParserError(b, "expected = after a key, but the document ends there")
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}
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b, err = expect('=', b)
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if err != nil {
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return invalidReference, nil, err
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}
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b = p.parseWhitespace(b)
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valRef, b, err := p.parseVal(b)
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if err != nil {
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return ref, b, err
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}
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p.builder.Chain(valRef, key)
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p.builder.AttachChild(ref, valRef)
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return ref, b, err
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}
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//nolint:cyclop,funlen
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func (p *Parser) parseVal(b []byte) (reference, []byte, error) {
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// val = string / boolean / array / inline-table / date-time / float / integer
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ref := invalidReference
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if len(b) == 0 {
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return ref, nil, NewParserError(b, "expected value, not eof")
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}
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var err error
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c := b[0]
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switch c {
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case '"':
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var raw []byte
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var v []byte
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if scanFollowsMultilineBasicStringDelimiter(b) {
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raw, v, b, err = p.parseMultilineBasicString(b)
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} else {
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raw, v, b, err = p.parseBasicString(b)
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}
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if err == nil {
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ref = p.builder.Push(Node{
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Kind: String,
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Raw: p.Range(raw),
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Data: v,
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})
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}
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return ref, b, err
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case '\'':
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var raw []byte
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var v []byte
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if scanFollowsMultilineLiteralStringDelimiter(b) {
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raw, v, b, err = p.parseMultilineLiteralString(b)
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} else {
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raw, v, b, err = p.parseLiteralString(b)
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}
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if err == nil {
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ref = p.builder.Push(Node{
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Kind: String,
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Raw: p.Range(raw),
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Data: v,
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})
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}
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return ref, b, err
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case 't':
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if !scanFollowsTrue(b) {
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return ref, nil, NewParserError(atmost(b, 4), "expected 'true'")
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}
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ref = p.builder.Push(Node{
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Kind: Bool,
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Data: b[:4],
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})
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return ref, b[4:], nil
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case 'f':
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if !scanFollowsFalse(b) {
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return ref, nil, NewParserError(atmost(b, 5), "expected 'false'")
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}
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ref = p.builder.Push(Node{
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Kind: Bool,
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Data: b[:5],
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})
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return ref, b[5:], nil
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case '[':
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return p.parseValArray(b)
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case '{':
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return p.parseInlineTable(b)
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default:
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return p.parseIntOrFloatOrDateTime(b)
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}
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}
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func atmost(b []byte, n int) []byte {
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if n >= len(b) {
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return b
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}
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return b[:n]
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}
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func (p *Parser) parseLiteralString(b []byte) ([]byte, []byte, []byte, error) {
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v, rest, err := scanLiteralString(b)
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if err != nil {
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return nil, nil, nil, err
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}
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return v, v[1 : len(v)-1], rest, nil
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}
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func (p *Parser) parseInlineTable(b []byte) (reference, []byte, error) {
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// inline-table = inline-table-open [ inline-table-keyvals ] inline-table-close
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// inline-table-open = %x7B ws ; {
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// inline-table-close = ws %x7D ; }
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// inline-table-sep = ws %x2C ws ; , Comma
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// inline-table-keyvals = keyval [ inline-table-sep inline-table-keyvals ]
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parent := p.builder.Push(Node{
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Kind: InlineTable,
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})
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first := true
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var child reference
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b = b[1:]
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var err error
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for len(b) > 0 {
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previousB := b
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b = p.parseWhitespace(b)
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if len(b) == 0 {
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return parent, nil, NewParserError(previousB[:1], "inline table is incomplete")
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}
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if b[0] == '}' {
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break
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}
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if !first {
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b, err = expect(',', b)
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if err != nil {
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return parent, nil, err
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}
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b = p.parseWhitespace(b)
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}
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var kv reference
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kv, b, err = p.parseKeyval(b)
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if err != nil {
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return parent, nil, err
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}
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if first {
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p.builder.AttachChild(parent, kv)
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} else {
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p.builder.Chain(child, kv)
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}
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child = kv
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first = false
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}
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rest, err := expect('}', b)
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return parent, rest, err
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}
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//nolint:funlen,cyclop
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func (p *Parser) parseValArray(b []byte) (reference, []byte, error) {
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// array = array-open [ array-values ] ws-comment-newline array-close
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// array-open = %x5B ; [
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// array-close = %x5D ; ]
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// array-values = ws-comment-newline val ws-comment-newline array-sep array-values
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// array-values =/ ws-comment-newline val ws-comment-newline [ array-sep ]
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// array-sep = %x2C ; , Comma
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// ws-comment-newline = *( wschar / [ comment ] newline )
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arrayStart := b
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b = b[1:]
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parent := p.builder.Push(Node{
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Kind: Array,
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})
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first := true
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var lastChild reference
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var err error
|
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for len(b) > 0 {
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b, err = p.parseOptionalWhitespaceCommentNewline(b)
|
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if err != nil {
|
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return parent, nil, err
|
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}
|
|
|
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if len(b) == 0 {
|
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return parent, nil, NewParserError(arrayStart[:1], "array is incomplete")
|
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}
|
|
|
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if b[0] == ']' {
|
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break
|
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}
|
|
|
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if b[0] == ',' {
|
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if first {
|
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return parent, nil, NewParserError(b[0:1], "array cannot start with comma")
|
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}
|
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b = b[1:]
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|
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b, err = p.parseOptionalWhitespaceCommentNewline(b)
|
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if err != nil {
|
|
return parent, nil, err
|
|
}
|
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} else if !first {
|
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return parent, nil, NewParserError(b[0:1], "array elements must be separated by commas")
|
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}
|
|
|
|
// TOML allows trailing commas in arrays.
|
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if len(b) > 0 && b[0] == ']' {
|
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break
|
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}
|
|
|
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var valueRef reference
|
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valueRef, b, err = p.parseVal(b)
|
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if err != nil {
|
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return parent, nil, err
|
|
}
|
|
|
|
if first {
|
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p.builder.AttachChild(parent, valueRef)
|
|
} else {
|
|
p.builder.Chain(lastChild, valueRef)
|
|
}
|
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lastChild = valueRef
|
|
|
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b, err = p.parseOptionalWhitespaceCommentNewline(b)
|
|
if err != nil {
|
|
return parent, nil, err
|
|
}
|
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first = false
|
|
}
|
|
|
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rest, err := expect(']', b)
|
|
|
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return parent, rest, err
|
|
}
|
|
|
|
func (p *Parser) parseOptionalWhitespaceCommentNewline(b []byte) ([]byte, error) {
|
|
for len(b) > 0 {
|
|
var err error
|
|
b = p.parseWhitespace(b)
|
|
|
|
if len(b) > 0 && b[0] == '#' {
|
|
_, b, err = scanComment(b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
if len(b) == 0 {
|
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break
|
|
}
|
|
|
|
if b[0] == '\n' || b[0] == '\r' {
|
|
b, err = p.parseNewline(b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
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break
|
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}
|
|
}
|
|
|
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return b, nil
|
|
}
|
|
|
|
func (p *Parser) parseMultilineLiteralString(b []byte) ([]byte, []byte, []byte, error) {
|
|
token, rest, err := scanMultilineLiteralString(b)
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
|
|
i := 3
|
|
|
|
// skip the immediate new line
|
|
if token[i] == '\n' {
|
|
i++
|
|
} else if token[i] == '\r' && token[i+1] == '\n' {
|
|
i += 2
|
|
}
|
|
|
|
return token, token[i : len(token)-3], rest, err
|
|
}
|
|
|
|
//nolint:funlen,gocognit,cyclop
|
|
func (p *Parser) parseMultilineBasicString(b []byte) ([]byte, []byte, []byte, error) {
|
|
// ml-basic-string = ml-basic-string-delim [ newline ] ml-basic-body
|
|
// ml-basic-string-delim
|
|
// ml-basic-string-delim = 3quotation-mark
|
|
// ml-basic-body = *mlb-content *( mlb-quotes 1*mlb-content ) [ mlb-quotes ]
|
|
//
|
|
// mlb-content = mlb-char / newline / mlb-escaped-nl
|
|
// mlb-char = mlb-unescaped / escaped
|
|
// mlb-quotes = 1*2quotation-mark
|
|
// mlb-unescaped = wschar / %x21 / %x23-5B / %x5D-7E / non-ascii
|
|
// mlb-escaped-nl = escape ws newline *( wschar / newline )
|
|
token, escaped, rest, err := scanMultilineBasicString(b)
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
|
|
i := 3
|
|
|
|
// skip the immediate new line
|
|
if token[i] == '\n' {
|
|
i++
|
|
} else if token[i] == '\r' && token[i+1] == '\n' {
|
|
i += 2
|
|
}
|
|
|
|
// fast path
|
|
startIdx := i
|
|
endIdx := len(token) - len(`"""`)
|
|
|
|
if !escaped {
|
|
str := token[startIdx:endIdx]
|
|
verr := characters.Utf8TomlValidAlreadyEscaped(str)
|
|
if verr.Zero() {
|
|
return token, str, rest, nil
|
|
}
|
|
return nil, nil, nil, NewParserError(str[verr.Index:verr.Index+verr.Size], "invalid UTF-8")
|
|
}
|
|
|
|
var builder bytes.Buffer
|
|
|
|
// The scanner ensures that the token starts and ends with quotes and that
|
|
// escapes are balanced.
|
|
for i < len(token)-3 {
|
|
c := token[i]
|
|
|
|
//nolint:nestif
|
|
if c == '\\' {
|
|
// When the last non-whitespace character on a line is an unescaped \,
|
|
// it will be trimmed along with all whitespace (including newlines) up
|
|
// to the next non-whitespace character or closing delimiter.
|
|
|
|
isLastNonWhitespaceOnLine := false
|
|
j := 1
|
|
findEOLLoop:
|
|
for ; j < len(token)-3-i; j++ {
|
|
switch token[i+j] {
|
|
case ' ', '\t':
|
|
continue
|
|
case '\r':
|
|
if token[i+j+1] == '\n' {
|
|
continue
|
|
}
|
|
case '\n':
|
|
isLastNonWhitespaceOnLine = true
|
|
}
|
|
break findEOLLoop
|
|
}
|
|
if isLastNonWhitespaceOnLine {
|
|
i += j
|
|
for ; i < len(token)-3; i++ {
|
|
c := token[i]
|
|
if !(c == '\n' || c == '\r' || c == ' ' || c == '\t') {
|
|
i--
|
|
break
|
|
}
|
|
}
|
|
i++
|
|
continue
|
|
}
|
|
|
|
// handle escaping
|
|
i++
|
|
c = token[i]
|
|
|
|
switch c {
|
|
case '"', '\\':
|
|
builder.WriteByte(c)
|
|
case 'b':
|
|
builder.WriteByte('\b')
|
|
case 'f':
|
|
builder.WriteByte('\f')
|
|
case 'n':
|
|
builder.WriteByte('\n')
|
|
case 'r':
|
|
builder.WriteByte('\r')
|
|
case 't':
|
|
builder.WriteByte('\t')
|
|
case 'e':
|
|
builder.WriteByte(0x1B)
|
|
case 'u':
|
|
x, err := hexToRune(atmost(token[i+1:], 4), 4)
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
builder.WriteRune(x)
|
|
i += 4
|
|
case 'U':
|
|
x, err := hexToRune(atmost(token[i+1:], 8), 8)
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
|
|
builder.WriteRune(x)
|
|
i += 8
|
|
default:
|
|
return nil, nil, nil, NewParserError(token[i:i+1], "invalid escaped character %#U", c)
|
|
}
|
|
i++
|
|
} else {
|
|
size := characters.Utf8ValidNext(token[i:])
|
|
if size == 0 {
|
|
return nil, nil, nil, NewParserError(token[i:i+1], "invalid character %#U", c)
|
|
}
|
|
builder.Write(token[i : i+size])
|
|
i += size
|
|
}
|
|
}
|
|
|
|
return token, builder.Bytes(), rest, nil
|
|
}
|
|
|
|
func (p *Parser) parseKey(b []byte) (reference, []byte, error) {
|
|
// key = simple-key / dotted-key
|
|
// simple-key = quoted-key / unquoted-key
|
|
//
|
|
// unquoted-key = 1*( ALPHA / DIGIT / %x2D / %x5F ) ; A-Z / a-z / 0-9 / - / _
|
|
// quoted-key = basic-string / literal-string
|
|
// dotted-key = simple-key 1*( dot-sep simple-key )
|
|
//
|
|
// dot-sep = ws %x2E ws ; . Period
|
|
raw, key, b, err := p.parseSimpleKey(b)
|
|
if err != nil {
|
|
return invalidReference, nil, err
|
|
}
|
|
|
|
ref := p.builder.Push(Node{
|
|
Kind: Key,
|
|
Raw: p.Range(raw),
|
|
Data: key,
|
|
})
|
|
|
|
for {
|
|
b = p.parseWhitespace(b)
|
|
if len(b) > 0 && b[0] == '.' {
|
|
b = p.parseWhitespace(b[1:])
|
|
|
|
raw, key, b, err = p.parseSimpleKey(b)
|
|
if err != nil {
|
|
return ref, nil, err
|
|
}
|
|
|
|
p.builder.PushAndChain(Node{
|
|
Kind: Key,
|
|
Raw: p.Range(raw),
|
|
Data: key,
|
|
})
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
return ref, b, nil
|
|
}
|
|
|
|
func (p *Parser) parseSimpleKey(b []byte) (raw, key, rest []byte, err error) {
|
|
if len(b) == 0 {
|
|
return nil, nil, nil, NewParserError(b, "expected key but found none")
|
|
}
|
|
|
|
// simple-key = quoted-key / unquoted-key
|
|
// unquoted-key = 1*( ALPHA / DIGIT / %x2D / %x5F ) ; A-Z / a-z / 0-9 / - / _
|
|
// quoted-key = basic-string / literal-string
|
|
switch {
|
|
case b[0] == '\'':
|
|
return p.parseLiteralString(b)
|
|
case b[0] == '"':
|
|
return p.parseBasicString(b)
|
|
case isUnquotedKeyChar(b[0]):
|
|
key, rest = scanUnquotedKey(b)
|
|
return key, key, rest, nil
|
|
default:
|
|
return nil, nil, nil, NewParserError(b[0:1], "invalid character at start of key: %c", b[0])
|
|
}
|
|
}
|
|
|
|
//nolint:funlen,cyclop
|
|
func (p *Parser) parseBasicString(b []byte) ([]byte, []byte, []byte, error) {
|
|
// basic-string = quotation-mark *basic-char quotation-mark
|
|
// quotation-mark = %x22 ; "
|
|
// basic-char = basic-unescaped / escaped
|
|
// basic-unescaped = wschar / %x21 / %x23-5B / %x5D-7E / non-ascii
|
|
// escaped = escape escape-seq-char
|
|
// escape-seq-char = %x22 ; " quotation mark U+0022
|
|
// escape-seq-char =/ %x5C ; \ reverse solidus U+005C
|
|
// escape-seq-char =/ %x62 ; b backspace U+0008
|
|
// escape-seq-char =/ %x66 ; f form feed U+000C
|
|
// escape-seq-char =/ %x6E ; n line feed U+000A
|
|
// escape-seq-char =/ %x72 ; r carriage return U+000D
|
|
// escape-seq-char =/ %x74 ; t tab U+0009
|
|
// escape-seq-char =/ %x75 4HEXDIG ; uXXXX U+XXXX
|
|
// escape-seq-char =/ %x55 8HEXDIG ; UXXXXXXXX U+XXXXXXXX
|
|
token, escaped, rest, err := scanBasicString(b)
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
|
|
startIdx := len(`"`)
|
|
endIdx := len(token) - len(`"`)
|
|
|
|
// Fast path. If there is no escape sequence, the string should just be
|
|
// an UTF-8 encoded string, which is the same as Go. In that case,
|
|
// validate the string and return a direct reference to the buffer.
|
|
if !escaped {
|
|
str := token[startIdx:endIdx]
|
|
verr := characters.Utf8TomlValidAlreadyEscaped(str)
|
|
if verr.Zero() {
|
|
return token, str, rest, nil
|
|
}
|
|
return nil, nil, nil, NewParserError(str[verr.Index:verr.Index+verr.Size], "invalid UTF-8")
|
|
}
|
|
|
|
i := startIdx
|
|
|
|
var builder bytes.Buffer
|
|
|
|
// The scanner ensures that the token starts and ends with quotes and that
|
|
// escapes are balanced.
|
|
for i < len(token)-1 {
|
|
c := token[i]
|
|
if c == '\\' {
|
|
i++
|
|
c = token[i]
|
|
|
|
switch c {
|
|
case '"', '\\':
|
|
builder.WriteByte(c)
|
|
case 'b':
|
|
builder.WriteByte('\b')
|
|
case 'f':
|
|
builder.WriteByte('\f')
|
|
case 'n':
|
|
builder.WriteByte('\n')
|
|
case 'r':
|
|
builder.WriteByte('\r')
|
|
case 't':
|
|
builder.WriteByte('\t')
|
|
case 'e':
|
|
builder.WriteByte(0x1B)
|
|
case 'u':
|
|
x, err := hexToRune(token[i+1:len(token)-1], 4)
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
|
|
builder.WriteRune(x)
|
|
i += 4
|
|
case 'U':
|
|
x, err := hexToRune(token[i+1:len(token)-1], 8)
|
|
if err != nil {
|
|
return nil, nil, nil, err
|
|
}
|
|
|
|
builder.WriteRune(x)
|
|
i += 8
|
|
default:
|
|
return nil, nil, nil, NewParserError(token[i:i+1], "invalid escaped character %#U", c)
|
|
}
|
|
i++
|
|
} else {
|
|
size := characters.Utf8ValidNext(token[i:])
|
|
if size == 0 {
|
|
return nil, nil, nil, NewParserError(token[i:i+1], "invalid character %#U", c)
|
|
}
|
|
builder.Write(token[i : i+size])
|
|
i += size
|
|
}
|
|
}
|
|
|
|
return token, builder.Bytes(), rest, nil
|
|
}
|
|
|
|
func hexToRune(b []byte, length int) (rune, error) {
|
|
if len(b) < length {
|
|
return -1, NewParserError(b, "unicode point needs %d character, not %d", length, len(b))
|
|
}
|
|
b = b[:length]
|
|
|
|
var r uint32
|
|
for i, c := range b {
|
|
d := uint32(0)
|
|
switch {
|
|
case '0' <= c && c <= '9':
|
|
d = uint32(c - '0')
|
|
case 'a' <= c && c <= 'f':
|
|
d = uint32(c - 'a' + 10)
|
|
case 'A' <= c && c <= 'F':
|
|
d = uint32(c - 'A' + 10)
|
|
default:
|
|
return -1, NewParserError(b[i:i+1], "non-hex character")
|
|
}
|
|
r = r*16 + d
|
|
}
|
|
|
|
if r > unicode.MaxRune || 0xD800 <= r && r < 0xE000 {
|
|
return -1, NewParserError(b, "escape sequence is invalid Unicode code point")
|
|
}
|
|
|
|
return rune(r), nil
|
|
}
|
|
|
|
func (p *Parser) parseWhitespace(b []byte) []byte {
|
|
// ws = *wschar
|
|
// wschar = %x20 ; Space
|
|
// wschar =/ %x09 ; Horizontal tab
|
|
_, rest := scanWhitespace(b)
|
|
|
|
return rest
|
|
}
|
|
|
|
//nolint:cyclop
|
|
func (p *Parser) parseIntOrFloatOrDateTime(b []byte) (reference, []byte, error) {
|
|
switch b[0] {
|
|
case 'i':
|
|
if !scanFollowsInf(b) {
|
|
return invalidReference, nil, NewParserError(atmost(b, 3), "expected 'inf'")
|
|
}
|
|
|
|
return p.builder.Push(Node{
|
|
Kind: Float,
|
|
Data: b[:3],
|
|
}), b[3:], nil
|
|
case 'n':
|
|
if !scanFollowsNan(b) {
|
|
return invalidReference, nil, NewParserError(atmost(b, 3), "expected 'nan'")
|
|
}
|
|
|
|
return p.builder.Push(Node{
|
|
Kind: Float,
|
|
Data: b[:3],
|
|
}), b[3:], nil
|
|
case '+', '-':
|
|
return p.scanIntOrFloat(b)
|
|
}
|
|
|
|
if len(b) < 3 {
|
|
return p.scanIntOrFloat(b)
|
|
}
|
|
|
|
s := 5
|
|
if len(b) < s {
|
|
s = len(b)
|
|
}
|
|
|
|
for idx, c := range b[:s] {
|
|
if isDigit(c) {
|
|
continue
|
|
}
|
|
|
|
if idx == 2 && c == ':' || (idx == 4 && c == '-') {
|
|
return p.scanDateTime(b)
|
|
}
|
|
|
|
break
|
|
}
|
|
|
|
return p.scanIntOrFloat(b)
|
|
}
|
|
|
|
func (p *Parser) scanDateTime(b []byte) (reference, []byte, error) {
|
|
// scans for contiguous characters in [0-9T:Z.+-], and up to one space if
|
|
// followed by a digit.
|
|
hasDate := false
|
|
hasTime := false
|
|
hasTz := false
|
|
seenSpace := false
|
|
|
|
i := 0
|
|
byteLoop:
|
|
for ; i < len(b); i++ {
|
|
c := b[i]
|
|
|
|
switch {
|
|
case isDigit(c):
|
|
case c == '-':
|
|
hasDate = true
|
|
const minOffsetOfTz = 8
|
|
if i >= minOffsetOfTz {
|
|
hasTz = true
|
|
}
|
|
case c == 'T' || c == 't' || c == ':' || c == '.':
|
|
hasTime = true
|
|
case c == '+' || c == '-' || c == 'Z' || c == 'z':
|
|
hasTz = true
|
|
case c == ' ':
|
|
if !seenSpace && i+1 < len(b) && isDigit(b[i+1]) {
|
|
i += 2
|
|
// Avoid reaching past the end of the document in case the time
|
|
// is malformed. See TestIssue585.
|
|
if i >= len(b) {
|
|
i--
|
|
}
|
|
seenSpace = true
|
|
hasTime = true
|
|
} else {
|
|
break byteLoop
|
|
}
|
|
default:
|
|
break byteLoop
|
|
}
|
|
}
|
|
|
|
var kind Kind
|
|
|
|
if hasTime {
|
|
if hasDate {
|
|
if hasTz {
|
|
kind = DateTime
|
|
} else {
|
|
kind = LocalDateTime
|
|
}
|
|
} else {
|
|
kind = LocalTime
|
|
}
|
|
} else {
|
|
kind = LocalDate
|
|
}
|
|
|
|
return p.builder.Push(Node{
|
|
Kind: kind,
|
|
Data: b[:i],
|
|
}), b[i:], nil
|
|
}
|
|
|
|
//nolint:funlen,gocognit,cyclop
|
|
func (p *Parser) scanIntOrFloat(b []byte) (reference, []byte, error) {
|
|
i := 0
|
|
|
|
if len(b) > 2 && b[0] == '0' && b[1] != '.' && b[1] != 'e' && b[1] != 'E' {
|
|
var isValidRune validRuneFn
|
|
|
|
switch b[1] {
|
|
case 'x':
|
|
isValidRune = isValidHexRune
|
|
case 'o':
|
|
isValidRune = isValidOctalRune
|
|
case 'b':
|
|
isValidRune = isValidBinaryRune
|
|
default:
|
|
i++
|
|
}
|
|
|
|
if isValidRune != nil {
|
|
i += 2
|
|
for ; i < len(b); i++ {
|
|
if !isValidRune(b[i]) {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
return p.builder.Push(Node{
|
|
Kind: Integer,
|
|
Data: b[:i],
|
|
}), b[i:], nil
|
|
}
|
|
|
|
isFloat := false
|
|
|
|
for ; i < len(b); i++ {
|
|
c := b[i]
|
|
|
|
if c >= '0' && c <= '9' || c == '+' || c == '-' || c == '_' {
|
|
continue
|
|
}
|
|
|
|
if c == '.' || c == 'e' || c == 'E' {
|
|
isFloat = true
|
|
|
|
continue
|
|
}
|
|
|
|
if c == 'i' {
|
|
if scanFollowsInf(b[i:]) {
|
|
return p.builder.Push(Node{
|
|
Kind: Float,
|
|
Data: b[:i+3],
|
|
}), b[i+3:], nil
|
|
}
|
|
|
|
return invalidReference, nil, NewParserError(b[i:i+1], "unexpected character 'i' while scanning for a number")
|
|
}
|
|
|
|
if c == 'n' {
|
|
if scanFollowsNan(b[i:]) {
|
|
return p.builder.Push(Node{
|
|
Kind: Float,
|
|
Data: b[:i+3],
|
|
}), b[i+3:], nil
|
|
}
|
|
|
|
return invalidReference, nil, NewParserError(b[i:i+1], "unexpected character 'n' while scanning for a number")
|
|
}
|
|
|
|
break
|
|
}
|
|
|
|
if i == 0 {
|
|
return invalidReference, b, NewParserError(b, "incomplete number")
|
|
}
|
|
|
|
kind := Integer
|
|
|
|
if isFloat {
|
|
kind = Float
|
|
}
|
|
|
|
return p.builder.Push(Node{
|
|
Kind: kind,
|
|
Data: b[:i],
|
|
}), b[i:], nil
|
|
}
|
|
|
|
func isDigit(r byte) bool {
|
|
return r >= '0' && r <= '9'
|
|
}
|
|
|
|
type validRuneFn func(r byte) bool
|
|
|
|
func isValidHexRune(r byte) bool {
|
|
return r >= 'a' && r <= 'f' ||
|
|
r >= 'A' && r <= 'F' ||
|
|
r >= '0' && r <= '9' ||
|
|
r == '_'
|
|
}
|
|
|
|
func isValidOctalRune(r byte) bool {
|
|
return r >= '0' && r <= '7' || r == '_'
|
|
}
|
|
|
|
func isValidBinaryRune(r byte) bool {
|
|
return r == '0' || r == '1' || r == '_'
|
|
}
|
|
|
|
func expect(x byte, b []byte) ([]byte, error) {
|
|
if len(b) == 0 {
|
|
return nil, NewParserError(b, "expected character %c but the document ended here", x)
|
|
}
|
|
|
|
if b[0] != x {
|
|
return nil, NewParserError(b[0:1], "expected character %c", x)
|
|
}
|
|
|
|
return b[1:], nil
|
|
}
|