php-parser/internal/php7/parser.go
2020-06-30 00:45:15 +03:00

159 lines
3.2 KiB
Go

package php7
import (
"bytes"
"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
rootNode ast.Vertex
withTokens bool
errHandlerFunc func(*errors.Error)
}
// NewParser creates and returns new Parser
func NewParser(lexer *scanner.Lexer, withTokens bool, errHandlerFunc func(*errors.Error)) *Parser {
return &Parser{
withTokens: withTokens,
Lexer: lexer,
errHandlerFunc: errHandlerFunc,
}
}
func (p *Parser) Lex(lval *yySymType) int {
t := p.Lexer.Lex()
p.currentToken = t
lval.token = t
return int(t.ID)
}
func (p *Parser) Error(msg string) {
var pos = p.currentToken.Position
p.errHandlerFunc(errors.NewError(msg, &pos))
}
// Parse the php7 Parser entrypoint
func (p *Parser) Parse() int {
p.rootNode = nil
return yyParse(p)
}
// GetRootNode returns root node
func (p *Parser) GetRootNode() ast.Vertex {
return p.rootNode
}
// helpers
func lastNode(nn []ast.Vertex) ast.Vertex {
if len(nn) == 0 {
return nil
}
return nn[len(nn)-1]
}
func (p *Parser) MoveFreeFloating(src ast.Vertex, dst ast.Vertex) {
if p.withTokens == false {
return
}
if src.GetNode().Tokens == nil {
return
}
p.setFreeFloating(dst, token.Start, src.GetNode().Tokens[token.Start])
delete(src.GetNode().Tokens, token.Start)
}
func (p *Parser) setFreeFloating(dst ast.Vertex, pos token.Position, strings []token.Token) {
if p.withTokens == false {
return
}
if len(strings) == 0 {
return
}
dstCollection := &dst.GetNode().Tokens
if *dstCollection == nil {
*dstCollection = make(token.Collection)
}
(*dstCollection)[pos] = strings
}
func (p *Parser) GetFreeFloatingToken(t *scanner.Token) []token.Token {
if p.withTokens == false {
return []token.Token{}
}
return []token.Token{
{
ID: token.ID(t.ID),
Value: t.Value,
},
}
}
func (p *Parser) splitSemiColonAndPhpCloseTag(htmlNode ast.Vertex, prevNode ast.Vertex) {
if p.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] == ';' {
p.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:],
})
p.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
}