1# $NetBSD: cond-token-string.mk,v 1.6 2022/05/08 06:57:00 rillig Exp $ 2# 3# Tests for quoted string literals in .if conditions. 4# 5# See also: 6# cond-token-plain.mk 7# Covers string literals without quotes (called "bare words"). 8 9# TODO: Implementation 10 11# Cover the code in CondParser_String that frees the memory after parsing 12# a variable expression based on an undefined variable. 13.if "" != "${:Uvalue:Z}" 14. error 15.else 16. error 17.endif 18 19.if x${:Uvalue} 20. error 21.else 22. info xvalue is not defined. 23.endif 24 25# The 'x' produces a "Malformed conditional" since the left-hand side of a 26# comparison in an .if directive must be either a variable expression, a 27# quoted string literal or a number that starts with a digit. 28.if x${:Uvalue} == "" 29. error 30.else 31. error 32.endif 33 34# In plain words, a '\' can be used to escape any character, just as in 35# double-quoted string literals. See CondParser_String. 36.if \x${:Uvalue} == "xvalue" 37. info Expected. 38.else 39. error 40.endif 41 42.MAKEFLAGS: -dc 43 44# A string in quotes is checked whether it is not empty. 45.if "UNDEF" 46. info The string literal "UNDEF" is not empty. 47.else 48. error 49.endif 50 51# A space is not empty as well. 52# This differs from many other places where whitespace is trimmed. 53.if " " 54. info The string literal " " is not empty, even though it consists of $\ 55 whitespace only. 56.else 57. error 58.endif 59 60.if "${UNDEF}" 61. error 62.else 63. info An undefined variable in quotes expands to an empty string, which $\ 64 then evaluates to false. 65.endif 66 67.if "${:Uvalue}" 68. info A nonempty variable expression evaluates to true. 69.else 70. error 71.endif 72 73.if "${:U}" 74. error 75.else 76. info An empty variable evaluates to false. 77.endif 78 79# A non-empty string evaluates to true, no matter if it's a literal string or 80# if it contains variable expressions. The parentheses are not necessary for 81# the parser, in this case their only purpose is to make the code harder to 82# read for humans. 83VAR= value 84.if ("${VAR}") 85.else 86. error 87.endif 88 89# In the conditions in .if directives, the left-hand side of a comparison must 90# be enclosed in quotes. The right-hand side does not need to be enclosed in 91# quotes. 92.if "quoted" == quoted 93.else 94. error 95.endif 96 97.MAKEFLAGS: -d0 98 99all: .PHONY 100