Cleanup parser statements, add delete and insert statement, add TASKS.md for tracking tasks

sql/parseInsertStatement.go

@@ -0,0 +1,69 @@
+package sql
+
+import "fmt"
+
+func (p *Parser) parseInsert() (*InsertStatement, error) {
+	if !p.expectSequence(INTO, IDENT) {
+		return nil, p.unexpectedToken(INTO)
+	}
+
+	res := InsertStatement{}
+
+	_, _, res.Table = p.rescan()
+
+	if !p.expectNext(LPAREN) {
+		return nil, p.unexpectedToken(LPAREN)
+	}
+
+	fieldNames := make([]string, 0)
+
+	for loop := true; loop; {
+		_, tok, val := p.scan()
+		switch tok {
+		case IDENT:
+			fieldNames = append(fieldNames, val)
+		case RPAREN:
+			loop = false
+		case COMMA:
+			continue
+		default:
+			return nil, p.unexpectedToken(IDENT, RPAREN, COMMA)
+		}
+	}
+
+	if !p.expectSequence(VALUES, LPAREN) {
+		return nil, p.unexpectedToken()
+	}
+
+	values := make([]any, 0, len(fieldNames))
+	for loop := true; loop; {
+		_, tok, val := p.scan()
+		switch tok {
+		case IDENT:
+			// TODO, convert to actual datatype?
+			values = append(values, val)
+		case COMMA, QUOTE, SINGLE_QUOTE, BACKQUOTE:
+			continue
+		case RPAREN:
+			loop = false
+		default:
+			return nil, p.unexpectedToken(IDENT, RPAREN, COMMA)
+		}
+	}
+
+	if len(values) != len(fieldNames) {
+		return nil, fmt.Errorf("Expected same amount of Values as Fields, but got %v fields, and %v values", fieldNames, values)
+	}
+
+	// Handle things like RETURNING *, also handle multiple Values
+	if !p.consumeUntilOne(50, SEMI, EOF) {
+		return nil, fmt.Errorf("Expected semicolon but never found after 50 tries")
+	}
+
+	res.Values = make(map[string]any)
+	for i, name := range fieldNames {
+		res.Values[name] = values[i]
+	}
+
+	return &res, nil
+}