php-parser/internal/php7/parser.go
2020-05-18 21:44:03 +03:00

203 lines
3.9 KiB
Go

package php7
import (
"bytes"
"github.com/z7zmey/php-parser/internal/positionbuilder"
"github.com/z7zmey/php-parser/internal/scanner"
"github.com/z7zmey/php-parser/pkg/ast"
"github.com/z7zmey/php-parser/pkg/errors"
"github.com/z7zmey/php-parser/pkg/token"
)
// Parser structure
type Parser struct {
Lexer *scanner.Lexer
currentToken *scanner.Token
positionBuilder *positionbuilder.PositionBuilder
rootNode ast.Vertex
errors []*errors.Error
withTokens bool
}
// NewParser creates and returns new Parser
func NewParser(src []byte, v string, withTokens bool) *Parser {
parser := &Parser{
withTokens: withTokens,
}
scannerConfig := scanner.Config{
WithHiddenTokens: withTokens,
ErrHandlerFunc: func(e *errors.Error) {
parser.errors = append(parser.errors, e)
},
}
lexer := scanner.NewLexer(src, v, scannerConfig)
parser.Lexer = lexer
return parser
}
func (l *Parser) Lex(lval *yySymType) int {
t := l.Lexer.Lex()
l.currentToken = t
lval.token = t
return int(t.ID)
}
func (l *Parser) Error(msg string) {
var pos = l.currentToken.Position
l.errors = append(l.errors, errors.NewError(msg, &pos))
}
// GetErrors returns errors list
func (l *Parser) GetErrors() []*errors.Error {
return l.errors
}
// Parse the php7 Parser entrypoint
func (l *Parser) Parse() int {
// init
l.errors = nil
l.rootNode = nil
l.positionBuilder = &positionbuilder.PositionBuilder{}
// parse
return yyParse(l)
}
// GetRootNode returns root node
func (l *Parser) GetRootNode() ast.Vertex {
return l.rootNode
}
// helpers
func lastNode(nn []ast.Vertex) ast.Vertex {
if len(nn) == 0 {
return nil
}
return nn[len(nn)-1]
}
func firstNode(nn []ast.Vertex) ast.Vertex {
return nn[0]
}
func isDollar(r rune) bool {
return r == '$'
}
func (l *Parser) MoveFreeFloating(src ast.Vertex, dst ast.Vertex) {
if l.withTokens == false {
return
}
if src.GetNode().Tokens == nil {
return
}
l.setFreeFloating(dst, token.Start, src.GetNode().Tokens[token.Start])
delete(src.GetNode().Tokens, token.Start)
}
func (l *Parser) setFreeFloating(dst ast.Vertex, p token.Position, strings []token.Token) {
if l.withTokens == false {
return
}
if len(strings) == 0 {
return
}
dstCollection := &dst.GetNode().Tokens
if *dstCollection == nil {
*dstCollection = make(token.Collection)
}
(*dstCollection)[p] = strings
}
func (l *Parser) GetFreeFloatingToken(t *scanner.Token) []token.Token {
if l.withTokens == false {
return []token.Token{}
}
return []token.Token{
{
ID: token.ID(t.ID),
Value: t.Value,
},
}
}
func (l *Parser) addDollarToken(v ast.Vertex) {
if l.withTokens == false {
return
}
l.setFreeFloating(v, token.Dollar, []token.Token{
{
ID: token.ID('$'),
Value: []byte("$"),
},
})
}
func (l *Parser) splitSemiColonAndPhpCloseTag(htmlNode ast.Vertex, prevNode ast.Vertex) {
if l.withTokens == false {
return
}
semiColon := prevNode.GetNode().Tokens[token.SemiColon]
delete(prevNode.GetNode().Tokens, token.SemiColon)
if len(semiColon) == 0 {
return
}
if semiColon[0].Value[0] == ';' {
l.setFreeFloating(prevNode, token.SemiColon, []token.Token{
{
ID: token.ID(';'),
Value: semiColon[0].Value[0:1],
},
})
}
vlen := len(semiColon[0].Value)
tlen := 2
if bytes.HasSuffix(semiColon[0].Value, []byte("?>\n")) {
tlen = 3
}
phpCloseTag := []token.Token{}
if vlen-tlen > 1 {
phpCloseTag = append(phpCloseTag, token.Token{
ID: token.T_WHITESPACE,
Value: semiColon[0].Value[1 : vlen-tlen],
})
}
phpCloseTag = append(phpCloseTag, token.Token{
ID: T_CLOSE_TAG,
Value: semiColon[0].Value[vlen-tlen:],
})
l.setFreeFloating(htmlNode, token.Start, append(phpCloseTag, htmlNode.GetNode().Tokens[token.Start]...))
}
func (p *Parser) returnTokenToPool(yyDollar []yySymType, yyVAL *yySymType) {
for i := 1; i < len(yyDollar); i++ {
if yyDollar[i].token != nil {
p.Lexer.ReturnTokenToPool(yyDollar[i].token)
}
yyDollar[i].token = nil
}
yyVAL.token = nil
}