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LibJS: Implement tagged template literals (foobar)

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To make processing tagged template literals easier, template literals
will now add one empty StringLiteral before and after each template
expression *if* there's no other string - e.g.:

`${foo}` -> "", foo, ""
`test${foo}${bar}test` -> "test", foo, "", bar, "test"

This also matches the behaviour of many other parsers.
This commit is contained in:
Linus Groh
2020-05-06 10:17:35 +01:00
committed by Andreas Kling
parent eea62dd365
commit 4d20cf57db
4 changed files with 161 additions and 3 deletions
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14
Libraries/LibJS/Parser.cpp
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@@ -560,6 +560,9 @@ NonnullRefPtr<TemplateLiteral> Parser::parse_template_literal()
NonnullRefPtrVector<Expression> expressions;
if (!match(TokenType::TemplateLiteralString))
expressions.append(create_ast_node<StringLiteral>(""));
while (!match(TokenType::TemplateLiteralEnd) && !match(TokenType::UnterminatedTemplateLiteral)) {
if (match(TokenType::TemplateLiteralString)) {
expressions.append(create_ast_node<StringLiteral>(consume().string_value()));
@@ -576,6 +579,9 @@ NonnullRefPtr<TemplateLiteral> Parser::parse_template_literal()
return create_ast_node<TemplateLiteral>(expressions);
}
consume(TokenType::TemplateLiteralExprEnd);
if (!match(TokenType::TemplateLiteralString))
expressions.append(create_ast_node<StringLiteral>(""));
}
}
@@ -591,6 +597,10 @@ NonnullRefPtr<TemplateLiteral> Parser::parse_template_literal()
NonnullRefPtr<Expression> Parser::parse_expression(int min_precedence, Associativity associativity)
{
auto expression = parse_primary_expression();
while (match(TokenType::TemplateLiteralStart)) {
auto template_literal = parse_template_literal();
expression = create_ast_node<TaggedTemplateLiteral>(move(expression), move(template_literal));
}
while (match_secondary_expression()) {
int new_precedence = operator_precedence(m_parser_state.m_current_token.type());
if (new_precedence < min_precedence)
@@ -600,6 +610,10 @@ NonnullRefPtr<Expression> Parser::parse_expression(int min_precedence, Associati
Associativity new_associativity = operator_associativity(m_parser_state.m_current_token.type());
expression = parse_secondary_expression(move(expression), new_precedence, new_associativity);
while (match(TokenType::TemplateLiteralStart)) {
auto template_literal = parse_template_literal();
expression = create_ast_node<TaggedTemplateLiteral>(move(expression), move(template_literal));
}
}
return expression;
}