Method parseTemplateParts

hclsyntax/parser_template.go:365–689

parseTemplateParts produces a flat sequence of "template tokens", which are either literal values (with any "trimming" already applied), interpolation sequences, or control flow markers. A further pass is required on the result to turn it into an AST.

(end TokenType)

//
// A further pass is required on the result to turn it into an AST.
func (p *parser) parseTemplateParts(end TokenType) (*templateParts, hcl.Diagnostics) {
	var parts []templateToken
	var diags hcl.Diagnostics

	startRange := p.NextRange()
	ltrimNext := false
	nextCanTrimPrev := false
	var endRange hcl.Range

Token:
	for {
		next := p.Read()
		if next.Type == end {
			// all done!
			endRange = next.Range
			break
		}

		ltrim := ltrimNext
		ltrimNext = false
		canTrimPrev := nextCanTrimPrev
		nextCanTrimPrev = false

		switch next.Type {
		case TokenStringLit, TokenQuotedLit:
			str, strDiags := ParseStringLiteralToken(next)
			diags = append(diags, strDiags...)

			if ltrim {
				str = strings.TrimLeftFunc(str, unicode.IsSpace)
			}

			parts = append(parts, &templateLiteralToken{
				Val:      str,
				SrcRange: next.Range,
			})
			nextCanTrimPrev = true

		case TokenTemplateInterp:
			// if the opener is ${~ then we want to eat any trailing whitespace
			// in the preceding literal token, assuming it is indeed a literal
			// token.
			if canTrimPrev && len(next.Bytes) == 3 && next.Bytes[2] == '~' && len(parts) > 0 {
				prevExpr := parts[len(parts)-1]
				if lexpr, ok := prevExpr.(*templateLiteralToken); ok {
					lexpr.Val = strings.TrimRightFunc(lexpr.Val, unicode.IsSpace)
				}
			}

			p.PushIncludeNewlines(false)
			expr, exprDiags := p.ParseExpression()
			diags = append(diags, exprDiags...)
			close := p.Peek()
			if close.Type != TokenTemplateSeqEnd {
				if !p.recovery {
					switch close.Type {
					case TokenEOF:
						diags = append(diags, &hcl.Diagnostic{