Method parseQuotedStringLiteral

hclsyntax/parser.go:1813–1900

parseQuotedStringLiteral is a helper for parsing quoted strings that aren't allowed to contain any interpolations, such as block labels.

()

// parseQuotedStringLiteral is a helper for parsing quoted strings that
// aren't allowed to contain any interpolations, such as block labels.
func (p *parser) parseQuotedStringLiteral() (string, hcl.Range, hcl.Diagnostics) {
	oQuote := p.Read()
	if oQuote.Type != TokenOQuote {
		return "", oQuote.Range, hcl.Diagnostics{
			{
				Severity: hcl.DiagError,
				Summary:  "Invalid string literal",
				Detail:   "A quoted string is required here.",
				Subject:  &oQuote.Range,
			},
		}
	}

	var diags hcl.Diagnostics
	ret := &bytes.Buffer{}
	var endRange hcl.Range

Token:
	for {
		tok := p.Read()
		switch tok.Type {

		case TokenCQuote:
			endRange = tok.Range
			break Token

		case TokenQuotedLit:
			s, sDiags := ParseStringLiteralToken(tok)
			diags = append(diags, sDiags...)
			ret.WriteString(s)

		case TokenTemplateControl, TokenTemplateInterp:
			which := "$"
			if tok.Type == TokenTemplateControl {
				which = "%"
			}

			diags = append(diags, &hcl.Diagnostic{
				Severity: hcl.DiagError,
				Summary:  "Invalid string literal",
				Detail: fmt.Sprintf(
					"Template sequences are not allowed in this string. To include a literal %q, double it (as \"%s%s\") to escape it.",
					which, which, which,
				),
				Subject: &tok.Range,
				Context: hcl.RangeBetween(oQuote.Range, tok.Range).Ptr(),
			})

			// Now that we're returning an error callers won't attempt to use
			// the result for any real operations, but they might try to use
			// the partial AST for other analyses, so we'll leave a marker
			// to indicate that there was something invalid in the string to
			// help avoid misinterpretation of the partial result
			ret.WriteString(which)
			ret.WriteString("{ ... }")

			p.recover(TokenTemplateSeqEnd) // we'll try to keep parsing after the sequence ends