120 lines
2.2 KiB
Go
120 lines
2.2 KiB
Go
package parser
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import (
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"bufio"
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"bytes"
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"go/token"
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"io"
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"unicode"
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"github.com/cznic/golex/lex"
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"github.com/z7zmey/php-parser/comment"
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t "github.com/z7zmey/php-parser/token"
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)
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// Allocate Character classes anywhere in [0x80, 0xFF].
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const (
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classUnicodeLeter = iota + 0x80
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classUnicodeDigit
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classUnicodeGraphic
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classOther
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)
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type lexer struct {
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*lex.Lexer
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stateStack []int
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phpDocComment string
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comments []comment.Comment
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}
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func rune2Class(r rune) int {
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if r >= 0 && r < 0x80 { // Keep ASCII as it is.
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return int(r)
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}
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if unicode.IsLetter(r) {
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return classUnicodeLeter
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}
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if unicode.IsDigit(r) {
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return classUnicodeDigit
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}
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if unicode.IsGraphic(r) {
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return classUnicodeGraphic
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}
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// return classOther
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return -1
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}
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func newLexer(src io.Reader, fName string) *lexer {
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file := token.NewFileSet().AddFile(fName, -1, 1<<31-1)
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lx, err := lex.New(file, bufio.NewReader(src), lex.RuneClass(rune2Class))
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if err != nil {
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panic(err)
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}
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return &lexer{lx, []int{0}, "", nil}
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}
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func (l *lexer) ungetChars(n int) []lex.Char {
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l.Unget(l.Lookahead())
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chars := l.Token()
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for i := 1; i <= n; i++ {
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char := chars[len(chars)-i]
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l.Unget(char)
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}
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buf := l.Token()
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buf = buf[:len(buf)-n]
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return buf
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}
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func (l *lexer) pushState(state int) {
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l.stateStack = append(l.stateStack, state)
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}
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func (l *lexer) popState() {
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len := len(l.stateStack)
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if len <= 1 {
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return
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}
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l.stateStack = l.stateStack[:len-1]
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}
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func (l *lexer) begin(state int) {
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len := len(l.stateStack)
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l.stateStack = l.stateStack[:len-1]
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l.stateStack = append(l.stateStack, state)
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}
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func (l *lexer) getCurrentState() int {
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return l.stateStack[len(l.stateStack)-1]
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}
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func (l *lexer) newToken(chars []lex.Char) t.Token {
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firstChar := chars[0]
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lastChar := chars[len(chars)-1]
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startLine := l.File.Line(firstChar.Pos())
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endLine := l.File.Line(lastChar.Pos())
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startPos := int(firstChar.Pos())
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endPos := int(lastChar.Pos())
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return t.NewToken(l.charsToBytes(chars), startLine, endLine, startPos, endPos).SetComments(l.comments)
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}
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func (l *lexer) addComment(c comment.Comment) {
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l.comments = append(l.comments, c)
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}
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func (l *lexer) charsToBytes(chars []lex.Char) []byte {
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bytesBuf := bytes.Buffer{}
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for _, c := range chars {
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bytesBuf.WriteRune(c.Rune)
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}
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return bytesBuf.Bytes()
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}
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