Method parseTernaryConditional

hclsyntax/parser.go:482–541

()

}

func (p *parser) parseTernaryConditional() (Expression, hcl.Diagnostics) {
	// The ternary conditional operator (.. ? .. : ..) behaves somewhat
	// like a binary operator except that the "symbol" is itself
	// an expression enclosed in two punctuation characters.
	// The middle expression is parsed as if the ? and : symbols
	// were parentheses. The "rhs" (the "false expression") is then
	// treated right-associatively so it behaves similarly to the
	// middle in terms of precedence.

	startRange := p.NextRange()
	var condExpr, trueExpr, falseExpr Expression
	var diags hcl.Diagnostics

	condExpr, condDiags := p.parseBinaryOps(binaryOps)
	diags = append(diags, condDiags...)
	if p.recovery && condDiags.HasErrors() {
		return condExpr, diags
	}

	questionMark := p.Peek()
	if questionMark.Type != TokenQuestion {
		return condExpr, diags
	}

	p.Read() // eat question mark

	trueExpr, trueDiags := p.ParseExpression()
	diags = append(diags, trueDiags...)
	if p.recovery && trueDiags.HasErrors() {
		return condExpr, diags
	}

	colon := p.Peek()
	if colon.Type != TokenColon {
		diags = append(diags, &hcl.Diagnostic{
			Severity: hcl.DiagError,
			Summary:  "Missing false expression in conditional",
			Detail:   "The conditional operator (...?...:...) requires a false expression, delimited by a colon.",
			Subject:  &colon.Range,
			Context:  hcl.RangeBetween(startRange, colon.Range).Ptr(),
		})
		return condExpr, diags
	}

	p.Read() // eat colon

	falseExpr, falseDiags := p.ParseExpression()
	diags = append(diags, falseDiags...)
	if p.recovery && falseDiags.HasErrors() {
		return condExpr, diags
	}

	return &ConditionalExpr{
		Condition:   condExpr,
		TrueResult:  trueExpr,
		FalseResult: falseExpr,

		SrcRange: hcl.RangeBetween(startRange, falseExpr.Range()),