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Adding the possibility to ignore some variables #55

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Adding the possibility to ignore some variables #55

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0a46ce8
Add ignored variables functionnality
CL0Pinette Apr 10, 2023
7fa02ce
Add test for ignored variables
CL0Pinette Apr 10, 2023
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4 changes: 4 additions & 0 deletions parse/lex.go
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@ const (
itemColonEquals // colon-equals (':=')
itemColonDash // colon-dash(':-')
itemColonPlus // colon-plus(':+')
itemIgnored // double dollar ('$$') variable should be ignored
itemVariable // variable starting with '$', such as '$hello' or '$1'
itemLeftDelim // left action delimiter '${'
itemRightDelim // right action delimiter '}'
Expand Down Expand Up @@ -194,6 +195,9 @@ func lexVariable(l *lexer) stateFn {
var r rune
for {
r = l.next()
if r == '$' {
l.emit(itemIgnored)
}
if !isAlphaNumeric(r) {
l.backup()
break
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9 changes: 9 additions & 0 deletions parse/lex_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,15 @@ var lexTests = []lexTest{
{itemVariable, 0, "$world"},
tEOF,
}},
{"ignored var", "$$hello", []item{
{itemIgnored, 0, "$$hello"},
tEOF,
}},
{"2 ignored vars", "$$hello$$world", []item{
{itemIgnored, 0, "$$hello"},
{itemIgnored, 0, "$$world"},
tEOF,
}},
{"substitution-1", "bar ${BAR}", []item{
{itemText, 0, "bar "},
tLeft,
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3 changes: 3 additions & 0 deletions parse/parse.go
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Expand Up @@ -117,6 +117,9 @@ Loop:
continue
}
fallthrough
case itemIgnored:
textNode := NewText(strings.TrimPrefix(t.val, "$"))
p.nodes = append(p.nodes, textNode)
default:
textNode := NewText(t.val)
p.nodes = append(p.nodes, textNode)
Expand Down
2 changes: 2 additions & 0 deletions parse/parse_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,8 @@ var parseTests = []parseTest{
{"with text", "$BAR baz", "bar baz", errNone},
{"concatenated", "$BAR$FOO", "barfoo", errNone},
{"2 env var", "$BAR - $FOO", "bar - foo", errNone},
{"ignored var", "$$BAR - $$FOO", "$BAR - $FOO", errNone},
{"2 ignored vars", "$BAR - $FOO", "$BAR - $FOO", errNone},
{"invalid var", "$_ bar", "$_ bar", errNone},
{"invalid subst var", "${_} bar", "${_} bar", errNone},
{"value of $var", "${BAR}baz", "barbaz", errNone},
Expand Down