varmod-edge.mk revision 1.1
1# $NetBSD: varmod-edge.mk,v 1.1 2019/11/30 00:38:51 rillig Exp $ 2# 3# Tests for edge cases in variable modifiers. 4# 5# These tests demonstrate the current implementation in small examples. 6# They may contain surprising behavior. 7# 8# Each test consists of: 9# - INP, the input to the test 10# - MOD, the expression for testing the modifier 11# - EXP, the expected output 12 13TESTS+= M-paren 14INP.M-paren= (parentheses) {braces} (opening closing) () 15MOD.M-paren= ${INP.M-paren:M(*)} 16EXP.M-paren= (parentheses) () 17 18# The first closing brace matches the opening parenthesis. 19# The second closing brace actually ends the variable expression. 20# 21# XXX: This is unexpected but rarely occurs in practice. 22TESTS+= M-mixed 23INP.M-mixed= (paren-brace} ( 24MOD.M-mixed= ${INP.M-mixed:M(*}} 25EXP.M-mixed= (paren-brace} 26 27# When the :M and :N modifiers are parsed, the pattern finishes as soon 28# as open_parens + open_braces == closing_parens + closing_braces. This 29# means that ( and } form a matching pair. 30# 31# Nested variable expressions are not parsed as such. Instead, only the 32# parentheses and braces are counted. This leads to a parse error since 33# the nested expression is not "${:U*)}" but only "${:U*)", which is 34# missing the closing brace. The expression is evaluated anyway. 35# The final brace in the output comes from the end of M.nest-mix. 36# 37# XXX: This is unexpected but rarely occurs in practice. 38TESTS+= M-nest-mix 39INP.M-nest-mix= (parentheses) 40MOD.M-nest-mix= ${INP.M-nest-mix:M${:U*)}} 41EXP.M-nest-mix= (parentheses)} 42 43# In contrast to parentheses and braces, the brackets are not counted 44# when the :M modifier is parsed since Makefile variables only take the 45# ${VAR} or $(VAR) forms, but not $[VAR]. 46# 47# The final ] in the pattern is needed to close the character class. 48TESTS+= M-nest-brk 49INP.M-nest-brk= [ [[ [[[ 50MOD.M-nest-brk= ${INP.M-nest-brk:M${:U[[[[[]}} 51EXP.M-nest-brk= [ 52 53# The pattern in the nested variable has an unclosed character class. 54# No error is reported though, and the pattern is closed implicitly. 55# 56# XXX: It is unexpected that no error is reported. 57TESTS+= M-pat-err 58INP.M-pat-err= [ [[ [[[ 59MOD.M-pat-err= ${INP.M-pat-err:M${:U[[}} 60EXP.M-pat-err= [ 61 62all: 63.for test in ${TESTS} 64. if ${MOD.${test}} == ${EXP.${test}} 65 @printf 'ok %s\n' ${test:Q}'' 66. else 67 @printf 'error in %s: expected %s, got %s\n' \ 68 ${test:Q}'' ${EXP.${test}:Q}'' ${MOD.${test}:Q}'' 69. endif 70.endfor 71