57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
package main
|
|
|
|
import (
|
|
"github.com/antlr4-go/antlr/v4"
|
|
"github.com/wyst-lang/wyst/parser"
|
|
)
|
|
|
|
type ASTNode struct {
|
|
Rule string
|
|
Text string
|
|
Inner []ASTNode
|
|
}
|
|
|
|
func getTokenName(tokenType int, lexer *parser.WystLexer) string {
|
|
if tokenType >= 0 && tokenType < len(lexer.SymbolicNames) {
|
|
if lexer.SymbolicNames[tokenType] != "" {
|
|
return lexer.SymbolicNames[tokenType]
|
|
}
|
|
return lexer.LiteralNames[tokenType]
|
|
}
|
|
return "UNKNOWN"
|
|
}
|
|
|
|
func ConvertAST(node antlr.Tree, wparser *parser.WystParser, lexer *parser.WystLexer) ASTNode {
|
|
var ast = ASTNode{}
|
|
switch node := node.(type) {
|
|
case antlr.TerminalNode:
|
|
token := node.GetSymbol()
|
|
ast.Text = token.GetText()
|
|
ast.Rule = getTokenName(token.GetTokenType(), lexer)
|
|
default:
|
|
if ruleContext, ok := node.(antlr.RuleContext); ok {
|
|
ast.Rule = wparser.RuleNames[ruleContext.GetRuleIndex()]
|
|
}
|
|
if parseTree, ok := node.(antlr.ParseTree); ok {
|
|
ast.Text = parseTree.GetText()
|
|
}
|
|
for i := 0; i < node.GetChildCount(); i++ {
|
|
l := ConvertAST(node.GetChild(i), wparser, lexer)
|
|
if l.Rule != ("'"+l.Text+"'") || l.Text == ";" {
|
|
ast.Inner = append(ast.Inner, l)
|
|
}
|
|
}
|
|
}
|
|
return ast
|
|
}
|
|
|
|
func Parse(code string) ASTNode {
|
|
chars := antlr.NewInputStream(code)
|
|
lexer := parser.NewWystLexer(chars)
|
|
stream := antlr.NewCommonTokenStream(lexer, 0)
|
|
p := parser.NewWystParser(stream)
|
|
// p.AddErrorListener(antlr.NewDiagnosticErrorListener(true).WithContext(p))
|
|
tree := p.Top()
|
|
return ConvertAST(tree, p, lexer)
|
|
}
|