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807 lines
16 KiB
Go
807 lines
16 KiB
Go
// TOML lexer.
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//
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// Written using the principles developed by Rob Pike in
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// http://www.youtube.com/watch?v=HxaD_trXwRE
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package toml
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import (
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"bytes"
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"errors"
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"fmt"
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"regexp"
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"strconv"
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"strings"
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)
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var dateRegexp *regexp.Regexp
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// Define state functions
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type tomlLexStateFn func() tomlLexStateFn
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// Define lexer
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type tomlLexer struct {
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inputIdx int
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input []rune // Textual source
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currentTokenStart int
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currentTokenStop int
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tokens []token
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brackets []rune
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line int
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col int
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endbufferLine int
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endbufferCol int
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}
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// Basic read operations on input
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func (l *tomlLexer) read() rune {
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r := l.peek()
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if r == '\n' {
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l.endbufferLine++
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l.endbufferCol = 1
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} else {
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l.endbufferCol++
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}
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l.inputIdx++
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return r
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}
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func (l *tomlLexer) next() rune {
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r := l.read()
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if r != eof {
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l.currentTokenStop++
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}
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return r
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}
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func (l *tomlLexer) ignore() {
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l.currentTokenStart = l.currentTokenStop
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l.line = l.endbufferLine
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l.col = l.endbufferCol
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}
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func (l *tomlLexer) skip() {
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l.next()
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l.ignore()
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}
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func (l *tomlLexer) fastForward(n int) {
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for i := 0; i < n; i++ {
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l.next()
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}
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}
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func (l *tomlLexer) emitWithValue(t tokenType, value string) {
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l.tokens = append(l.tokens, token{
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Position: Position{l.line, l.col},
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typ: t,
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val: value,
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})
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l.ignore()
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}
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func (l *tomlLexer) emit(t tokenType) {
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l.emitWithValue(t, string(l.input[l.currentTokenStart:l.currentTokenStop]))
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}
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func (l *tomlLexer) peek() rune {
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if l.inputIdx >= len(l.input) {
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return eof
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}
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return l.input[l.inputIdx]
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}
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func (l *tomlLexer) peekString(size int) string {
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maxIdx := len(l.input)
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upperIdx := l.inputIdx + size // FIXME: potential overflow
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if upperIdx > maxIdx {
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upperIdx = maxIdx
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}
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return string(l.input[l.inputIdx:upperIdx])
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}
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func (l *tomlLexer) follow(next string) bool {
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return next == l.peekString(len(next))
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}
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// Error management
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func (l *tomlLexer) errorf(format string, args ...interface{}) tomlLexStateFn {
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l.tokens = append(l.tokens, token{
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Position: Position{l.line, l.col},
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typ: tokenError,
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val: fmt.Sprintf(format, args...),
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})
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return nil
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}
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// State functions
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func (l *tomlLexer) lexVoid() tomlLexStateFn {
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for {
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next := l.peek()
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switch next {
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case '}': // after '{'
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return l.lexRightCurlyBrace
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case '[':
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return l.lexTableKey
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case '#':
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return l.lexComment(l.lexVoid)
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case '=':
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return l.lexEqual
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case '\r':
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fallthrough
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case '\n':
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l.skip()
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continue
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}
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if isSpace(next) {
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l.skip()
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}
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if isKeyStartChar(next) {
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return l.lexKey
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}
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if next == eof {
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l.next()
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break
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}
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}
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l.emit(tokenEOF)
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return nil
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}
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func (l *tomlLexer) lexRvalue() tomlLexStateFn {
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for {
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next := l.peek()
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switch next {
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case '.':
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return l.errorf("cannot start float with a dot")
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case '=':
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return l.lexEqual
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case '[':
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return l.lexLeftBracket
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case ']':
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return l.lexRightBracket
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case '{':
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return l.lexLeftCurlyBrace
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case '}':
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return l.lexRightCurlyBrace
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case '#':
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return l.lexComment(l.lexRvalue)
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case '"':
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return l.lexString
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case '\'':
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return l.lexLiteralString
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case ',':
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return l.lexComma
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case '\r':
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fallthrough
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case '\n':
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l.skip()
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if len(l.brackets) > 0 && l.brackets[len(l.brackets)-1] == '[' {
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return l.lexRvalue
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}
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return l.lexVoid
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}
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if l.follow("true") {
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return l.lexTrue
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}
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if l.follow("false") {
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return l.lexFalse
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}
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if l.follow("inf") {
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return l.lexInf
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}
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if l.follow("nan") {
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return l.lexNan
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}
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if isSpace(next) {
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l.skip()
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continue
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}
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if next == eof {
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l.next()
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break
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}
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possibleDate := l.peekString(35)
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dateSubmatches := dateRegexp.FindStringSubmatch(possibleDate)
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if dateSubmatches != nil && dateSubmatches[0] != "" {
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l.fastForward(len(dateSubmatches[0]))
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if dateSubmatches[2] == "" { // no timezone information => local date
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return l.lexLocalDate
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}
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return l.lexDate
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}
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if next == '+' || next == '-' || isDigit(next) {
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return l.lexNumber
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}
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return l.errorf("no value can start with %c", next)
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}
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l.emit(tokenEOF)
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return nil
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}
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func (l *tomlLexer) lexLeftCurlyBrace() tomlLexStateFn {
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l.next()
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l.emit(tokenLeftCurlyBrace)
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l.brackets = append(l.brackets, '{')
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return l.lexVoid
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}
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func (l *tomlLexer) lexRightCurlyBrace() tomlLexStateFn {
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l.next()
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l.emit(tokenRightCurlyBrace)
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if len(l.brackets) == 0 || l.brackets[len(l.brackets)-1] != '{' {
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return l.errorf("cannot have '}' here")
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}
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l.brackets = l.brackets[:len(l.brackets)-1]
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return l.lexRvalue
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}
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func (l *tomlLexer) lexDate() tomlLexStateFn {
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l.emit(tokenDate)
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return l.lexRvalue
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}
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func (l *tomlLexer) lexLocalDate() tomlLexStateFn {
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l.emit(tokenLocalDate)
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return l.lexRvalue
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}
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func (l *tomlLexer) lexTrue() tomlLexStateFn {
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l.fastForward(4)
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l.emit(tokenTrue)
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return l.lexRvalue
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}
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func (l *tomlLexer) lexFalse() tomlLexStateFn {
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l.fastForward(5)
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l.emit(tokenFalse)
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return l.lexRvalue
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}
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func (l *tomlLexer) lexInf() tomlLexStateFn {
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l.fastForward(3)
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l.emit(tokenInf)
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return l.lexRvalue
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}
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func (l *tomlLexer) lexNan() tomlLexStateFn {
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l.fastForward(3)
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l.emit(tokenNan)
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return l.lexRvalue
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}
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func (l *tomlLexer) lexEqual() tomlLexStateFn {
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l.next()
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l.emit(tokenEqual)
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return l.lexRvalue
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}
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func (l *tomlLexer) lexComma() tomlLexStateFn {
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l.next()
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l.emit(tokenComma)
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if len(l.brackets) > 0 && l.brackets[len(l.brackets)-1] == '{' {
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return l.lexVoid
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}
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return l.lexRvalue
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}
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// Parse the key and emits its value without escape sequences.
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// bare keys, basic string keys and literal string keys are supported.
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func (l *tomlLexer) lexKey() tomlLexStateFn {
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var sb strings.Builder
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for r := l.peek(); isKeyChar(r) || r == '\n' || r == '\r'; r = l.peek() {
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if r == '"' {
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l.next()
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str, err := l.lexStringAsString(`"`, false, true)
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if err != nil {
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return l.errorf(err.Error())
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}
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sb.WriteString("\"")
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sb.WriteString(str)
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sb.WriteString("\"")
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l.next()
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continue
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} else if r == '\'' {
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l.next()
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str, err := l.lexLiteralStringAsString(`'`, false)
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if err != nil {
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return l.errorf(err.Error())
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}
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sb.WriteString("'")
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sb.WriteString(str)
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sb.WriteString("'")
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l.next()
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continue
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} else if r == '\n' {
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return l.errorf("keys cannot contain new lines")
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} else if isSpace(r) {
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var str strings.Builder
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str.WriteString(" ")
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// skip trailing whitespace
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l.next()
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for r = l.peek(); isSpace(r); r = l.peek() {
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str.WriteRune(r)
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l.next()
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}
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// break loop if not a dot
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if r != '.' {
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break
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}
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str.WriteString(".")
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// skip trailing whitespace after dot
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l.next()
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for r = l.peek(); isSpace(r); r = l.peek() {
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str.WriteRune(r)
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l.next()
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}
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sb.WriteString(str.String())
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continue
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} else if r == '.' {
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// skip
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} else if !isValidBareChar(r) {
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return l.errorf("keys cannot contain %c character", r)
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}
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sb.WriteRune(r)
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l.next()
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}
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l.emitWithValue(tokenKey, sb.String())
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return l.lexVoid
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}
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func (l *tomlLexer) lexComment(previousState tomlLexStateFn) tomlLexStateFn {
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return func() tomlLexStateFn {
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for next := l.peek(); next != '\n' && next != eof; next = l.peek() {
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if next == '\r' && l.follow("\r\n") {
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break
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}
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l.next()
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}
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l.ignore()
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return previousState
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}
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}
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func (l *tomlLexer) lexLeftBracket() tomlLexStateFn {
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l.next()
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l.emit(tokenLeftBracket)
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l.brackets = append(l.brackets, '[')
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return l.lexRvalue
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}
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func (l *tomlLexer) lexLiteralStringAsString(terminator string, discardLeadingNewLine bool) (string, error) {
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var sb strings.Builder
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if discardLeadingNewLine {
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if l.follow("\r\n") {
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l.skip()
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l.skip()
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} else if l.peek() == '\n' {
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l.skip()
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}
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}
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// find end of string
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for {
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if l.follow(terminator) {
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return sb.String(), nil
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}
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next := l.peek()
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if next == eof {
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break
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}
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sb.WriteRune(l.next())
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}
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return "", errors.New("unclosed string")
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}
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func (l *tomlLexer) lexLiteralString() tomlLexStateFn {
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l.skip()
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// handle special case for triple-quote
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terminator := "'"
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discardLeadingNewLine := false
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if l.follow("''") {
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l.skip()
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l.skip()
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terminator = "'''"
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discardLeadingNewLine = true
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}
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str, err := l.lexLiteralStringAsString(terminator, discardLeadingNewLine)
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if err != nil {
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return l.errorf(err.Error())
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}
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l.emitWithValue(tokenString, str)
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l.fastForward(len(terminator))
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l.ignore()
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return l.lexRvalue
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}
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// Lex a string and return the results as a string.
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// Terminator is the substring indicating the end of the token.
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// The resulting string does not include the terminator.
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func (l *tomlLexer) lexStringAsString(terminator string, discardLeadingNewLine, acceptNewLines bool) (string, error) {
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var sb strings.Builder
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if discardLeadingNewLine {
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if l.follow("\r\n") {
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l.skip()
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l.skip()
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} else if l.peek() == '\n' {
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l.skip()
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}
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}
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for {
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if l.follow(terminator) {
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return sb.String(), nil
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}
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if l.follow("\\") {
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l.next()
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switch l.peek() {
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case '\r':
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fallthrough
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case '\n':
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fallthrough
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case '\t':
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fallthrough
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case ' ':
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// skip all whitespace chars following backslash
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for strings.ContainsRune("\r\n\t ", l.peek()) {
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l.next()
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}
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case '"':
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sb.WriteString("\"")
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l.next()
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case 'n':
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sb.WriteString("\n")
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l.next()
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case 'b':
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sb.WriteString("\b")
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l.next()
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case 'f':
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sb.WriteString("\f")
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l.next()
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case '/':
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sb.WriteString("/")
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l.next()
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case 't':
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sb.WriteString("\t")
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l.next()
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case 'r':
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sb.WriteString("\r")
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l.next()
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case '\\':
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sb.WriteString("\\")
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l.next()
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case 'u':
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l.next()
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var code strings.Builder
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for i := 0; i < 4; i++ {
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c := l.peek()
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if !isHexDigit(c) {
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return "", errors.New("unfinished unicode escape")
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}
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l.next()
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code.WriteRune(c)
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}
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intcode, err := strconv.ParseInt(code.String(), 16, 32)
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if err != nil {
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return "", errors.New("invalid unicode escape: \\u" + code.String())
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}
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sb.WriteRune(rune(intcode))
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case 'U':
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l.next()
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var code strings.Builder
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for i := 0; i < 8; i++ {
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c := l.peek()
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if !isHexDigit(c) {
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return "", errors.New("unfinished unicode escape")
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}
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l.next()
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code.WriteRune(c)
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}
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intcode, err := strconv.ParseInt(code.String(), 16, 64)
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if err != nil {
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return "", errors.New("invalid unicode escape: \\U" + code.String())
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}
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sb.WriteRune(rune(intcode))
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default:
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return "", errors.New("invalid escape sequence: \\" + string(l.peek()))
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}
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} else {
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r := l.peek()
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if 0x00 <= r && r <= 0x1F && r != '\t' && !(acceptNewLines && (r == '\n' || r == '\r')) {
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return "", fmt.Errorf("unescaped control character %U", r)
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}
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l.next()
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sb.WriteRune(r)
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}
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if l.peek() == eof {
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break
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}
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}
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return "", errors.New("unclosed string")
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}
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func (l *tomlLexer) lexString() tomlLexStateFn {
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l.skip()
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// handle special case for triple-quote
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terminator := `"`
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discardLeadingNewLine := false
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acceptNewLines := false
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if l.follow(`""`) {
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l.skip()
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l.skip()
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terminator = `"""`
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discardLeadingNewLine = true
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acceptNewLines = true
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}
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str, err := l.lexStringAsString(terminator, discardLeadingNewLine, acceptNewLines)
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if err != nil {
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return l.errorf(err.Error())
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}
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l.emitWithValue(tokenString, str)
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l.fastForward(len(terminator))
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l.ignore()
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return l.lexRvalue
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}
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func (l *tomlLexer) lexTableKey() tomlLexStateFn {
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l.next()
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if l.peek() == '[' {
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// token '[[' signifies an array of tables
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l.next()
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l.emit(tokenDoubleLeftBracket)
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return l.lexInsideTableArrayKey
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}
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// vanilla table key
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l.emit(tokenLeftBracket)
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return l.lexInsideTableKey
|
|
}
|
|
|
|
// Parse the key till "]]", but only bare keys are supported
|
|
func (l *tomlLexer) lexInsideTableArrayKey() tomlLexStateFn {
|
|
for r := l.peek(); r != eof; r = l.peek() {
|
|
switch r {
|
|
case ']':
|
|
if l.currentTokenStop > l.currentTokenStart {
|
|
l.emit(tokenKeyGroupArray)
|
|
}
|
|
l.next()
|
|
if l.peek() != ']' {
|
|
break
|
|
}
|
|
l.next()
|
|
l.emit(tokenDoubleRightBracket)
|
|
return l.lexVoid
|
|
case '[':
|
|
return l.errorf("table array key cannot contain ']'")
|
|
default:
|
|
l.next()
|
|
}
|
|
}
|
|
return l.errorf("unclosed table array key")
|
|
}
|
|
|
|
// Parse the key till "]" but only bare keys are supported
|
|
func (l *tomlLexer) lexInsideTableKey() tomlLexStateFn {
|
|
for r := l.peek(); r != eof; r = l.peek() {
|
|
switch r {
|
|
case ']':
|
|
if l.currentTokenStop > l.currentTokenStart {
|
|
l.emit(tokenKeyGroup)
|
|
}
|
|
l.next()
|
|
l.emit(tokenRightBracket)
|
|
return l.lexVoid
|
|
case '[':
|
|
return l.errorf("table key cannot contain ']'")
|
|
default:
|
|
l.next()
|
|
}
|
|
}
|
|
return l.errorf("unclosed table key")
|
|
}
|
|
|
|
func (l *tomlLexer) lexRightBracket() tomlLexStateFn {
|
|
l.next()
|
|
l.emit(tokenRightBracket)
|
|
if len(l.brackets) == 0 || l.brackets[len(l.brackets)-1] != '[' {
|
|
return l.errorf("cannot have ']' here")
|
|
}
|
|
l.brackets = l.brackets[:len(l.brackets)-1]
|
|
return l.lexRvalue
|
|
}
|
|
|
|
type validRuneFn func(r rune) bool
|
|
|
|
func isValidHexRune(r rune) bool {
|
|
return r >= 'a' && r <= 'f' ||
|
|
r >= 'A' && r <= 'F' ||
|
|
r >= '0' && r <= '9' ||
|
|
r == '_'
|
|
}
|
|
|
|
func isValidOctalRune(r rune) bool {
|
|
return r >= '0' && r <= '7' || r == '_'
|
|
}
|
|
|
|
func isValidBinaryRune(r rune) bool {
|
|
return r == '0' || r == '1' || r == '_'
|
|
}
|
|
|
|
func (l *tomlLexer) lexNumber() tomlLexStateFn {
|
|
r := l.peek()
|
|
|
|
if r == '0' {
|
|
follow := l.peekString(2)
|
|
if len(follow) == 2 {
|
|
var isValidRune validRuneFn
|
|
switch follow[1] {
|
|
case 'x':
|
|
isValidRune = isValidHexRune
|
|
case 'o':
|
|
isValidRune = isValidOctalRune
|
|
case 'b':
|
|
isValidRune = isValidBinaryRune
|
|
default:
|
|
if follow[1] >= 'a' && follow[1] <= 'z' || follow[1] >= 'A' && follow[1] <= 'Z' {
|
|
return l.errorf("unknown number base: %s. possible options are x (hex) o (octal) b (binary)", string(follow[1]))
|
|
}
|
|
}
|
|
|
|
if isValidRune != nil {
|
|
l.next()
|
|
l.next()
|
|
digitSeen := false
|
|
for {
|
|
next := l.peek()
|
|
if !isValidRune(next) {
|
|
break
|
|
}
|
|
digitSeen = true
|
|
l.next()
|
|
}
|
|
|
|
if !digitSeen {
|
|
return l.errorf("number needs at least one digit")
|
|
}
|
|
|
|
l.emit(tokenInteger)
|
|
|
|
return l.lexRvalue
|
|
}
|
|
}
|
|
}
|
|
|
|
if r == '+' || r == '-' {
|
|
l.next()
|
|
if l.follow("inf") {
|
|
return l.lexInf
|
|
}
|
|
if l.follow("nan") {
|
|
return l.lexNan
|
|
}
|
|
}
|
|
|
|
pointSeen := false
|
|
expSeen := false
|
|
digitSeen := false
|
|
for {
|
|
next := l.peek()
|
|
if next == '.' {
|
|
if pointSeen {
|
|
return l.errorf("cannot have two dots in one float")
|
|
}
|
|
l.next()
|
|
if !isDigit(l.peek()) {
|
|
return l.errorf("float cannot end with a dot")
|
|
}
|
|
pointSeen = true
|
|
} else if next == 'e' || next == 'E' {
|
|
expSeen = true
|
|
l.next()
|
|
r := l.peek()
|
|
if r == '+' || r == '-' {
|
|
l.next()
|
|
}
|
|
} else if isDigit(next) {
|
|
digitSeen = true
|
|
l.next()
|
|
} else if next == '_' {
|
|
l.next()
|
|
} else {
|
|
break
|
|
}
|
|
if pointSeen && !digitSeen {
|
|
return l.errorf("cannot start float with a dot")
|
|
}
|
|
}
|
|
|
|
if !digitSeen {
|
|
return l.errorf("no digit in that number")
|
|
}
|
|
if pointSeen || expSeen {
|
|
l.emit(tokenFloat)
|
|
} else {
|
|
l.emit(tokenInteger)
|
|
}
|
|
return l.lexRvalue
|
|
}
|
|
|
|
func (l *tomlLexer) run() {
|
|
for state := l.lexVoid; state != nil; {
|
|
state = state()
|
|
}
|
|
}
|
|
|
|
func init() {
|
|
// Regexp for all date/time formats supported by TOML.
|
|
// Group 1: nano precision
|
|
// Group 2: timezone
|
|
//
|
|
// /!\ also matches the empty string
|
|
//
|
|
// Example matches:
|
|
// 1979-05-27T07:32:00Z
|
|
// 1979-05-27T00:32:00-07:00
|
|
// 1979-05-27T00:32:00.999999-07:00
|
|
// 1979-05-27 07:32:00Z
|
|
// 1979-05-27 00:32:00-07:00
|
|
// 1979-05-27 00:32:00.999999-07:00
|
|
// 1979-05-27T07:32:00
|
|
// 1979-05-27T00:32:00.999999
|
|
// 1979-05-27 07:32:00
|
|
// 1979-05-27 00:32:00.999999
|
|
// 1979-05-27
|
|
// 07:32:00
|
|
// 00:32:00.999999
|
|
dateRegexp = regexp.MustCompile(`^(?:\d{1,4}-\d{2}-\d{2})?(?:[T ]?\d{2}:\d{2}:\d{2}(\.\d{1,9})?(Z|[+-]\d{2}:\d{2})?)?`)
|
|
}
|
|
|
|
// Entry point
|
|
func lexToml(inputBytes []byte) []token {
|
|
runes := bytes.Runes(inputBytes)
|
|
l := &tomlLexer{
|
|
input: runes,
|
|
tokens: make([]token, 0, 256),
|
|
line: 1,
|
|
col: 1,
|
|
endbufferLine: 1,
|
|
endbufferCol: 1,
|
|
}
|
|
l.run()
|
|
return l.tokens
|
|
}
|