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authorMatthew Holt <mholt@users.noreply.github.com>2019-09-10 19:21:52 -0600
committerMatthew Holt <mholt@users.noreply.github.com>2019-09-10 19:21:52 -0600
commit2459c292a4d6fb0552eb9be3cecd955093ed853b (patch)
tree5f10e9c5d8e9250e83f7282e8d57d386cb54e8a6 /caddyconfig/caddyfile
parent0cf592fa2e0d2fff8e9379095bbe17f7c8cbd4f2 (diff)
caddyfile: Improve Dispenser.NextBlock() to support nesting
Diffstat (limited to 'caddyconfig/caddyfile')
-rwxr-xr-xcaddyconfig/caddyfile/dispenser.go75
-rwxr-xr-xcaddyconfig/caddyfile/dispenser_test.go2
2 files changed, 55 insertions, 22 deletions
diff --git a/caddyconfig/caddyfile/dispenser.go b/caddyconfig/caddyfile/dispenser.go
index 938c985..de67ee1 100755
--- a/caddyconfig/caddyfile/dispenser.go
+++ b/caddyconfig/caddyfile/dispenser.go
@@ -123,18 +123,39 @@ func (d *Dispenser) NextLine() bool {
// NextBlock can be used as the condition of a for loop
// to load the next token as long as it opens a block or
-// is already in a block. It returns true if a token was
-// loaded, or false when the block's closing curly brace
-// was loaded and thus the block ended. Nested blocks are
-// not supported.
-func (d *Dispenser) NextBlock() bool {
- if d.nesting > 0 {
- d.Next()
+// is already in a block nested more than initialNestingLevel.
+// In other words, a loop over NextBlock() will iterate
+// all tokens in the block assuming the next token is an
+// open curly brace, until the matching closing brace.
+// The open and closing brace tokens for the outer-most
+// block will be consumed internally and omitted from
+// the iteration.
+//
+// Proper use of this method looks like this:
+//
+// for nesting := d.Nesting(); d.NextBlock(nesting); {
+// }
+//
+// However, in simple cases where it is known that the
+// Dispenser is new and has not already traversed state
+// by a loop over NextBlock(), this will do:
+//
+// for d.NextBlock(0) {
+// }
+//
+// As with other token parsing logic, a loop over
+// NextBlock() should be contained within a loop over
+// Next(), as it is usually prudent to skip the initial
+// token.
+func (d *Dispenser) NextBlock(initialNestingLevel int) bool {
+ if d.nesting > initialNestingLevel {
+ if !d.Next() {
+ return false // should be EOF error
+ }
if d.Val() == "}" {
d.nesting--
- return false
}
- return true
+ return d.nesting > initialNestingLevel
}
if !d.nextOnSameLine() { // block must open on same line
return false
@@ -143,19 +164,18 @@ func (d *Dispenser) NextBlock() bool {
d.cursor-- // roll back if not opening brace
return false
}
- d.Next()
+ d.Next() // consume open curly brace
if d.Val() == "}" {
- // open and then closed right away
- return false
+ return false // open and then closed right away
}
d.nesting++
return true
}
-// Nested returns true if the token is currently nested
-// inside a block (i.e. an open curly brace was consumed).
-func (d *Dispenser) Nested() bool {
- return d.nesting > 0
+// Nesting returns the current nesting level. Necessary
+// if using NextBlock()
+func (d *Dispenser) Nesting() int {
+ return d.nesting
}
// Val gets the text of the current token. If there is no token
@@ -230,19 +250,32 @@ func (d *Dispenser) RemainingArgs() []string {
// NewFromNextTokens returns a new dispenser with a copy of
// the tokens from the current token until the end of the
// "directive" whether that be to the end of the line or
-// the end of a block that starts at the end of the line.
+// the end of a block that starts at the end of the line;
+// in other words, until the end of the segment.
func (d *Dispenser) NewFromNextTokens() *Dispenser {
tkns := []Token{d.Token()}
for d.NextArg() {
tkns = append(tkns, d.Token())
}
- for d.NextBlock() {
- for d.Nested() {
+ var openedBlock bool
+ for nesting := d.Nesting(); d.NextBlock(nesting); {
+ if !openedBlock {
+ // because NextBlock() consumes the initial open
+ // curly brace, we rewind here to append it, since
+ // our case is special in that we want to include
+ // all the tokens including surrounding curly braces
+ // for a new dispenser to have
+ d.Prev()
tkns = append(tkns, d.Token())
- d.NextBlock()
+ d.Next()
+ openedBlock = true
}
+ tkns = append(tkns, d.Token())
+ }
+ if openedBlock {
+ // include closing brace accordingly
+ tkns = append(tkns, d.Token())
}
- tkns = append(tkns, d.Token())
return NewDispenser(tkns)
}
diff --git a/caddyconfig/caddyfile/dispenser_test.go b/caddyconfig/caddyfile/dispenser_test.go
index 07fbbee..494db36 100755
--- a/caddyconfig/caddyfile/dispenser_test.go
+++ b/caddyconfig/caddyfile/dispenser_test.go
@@ -148,7 +148,7 @@ func TestDispenser_NextBlock(t *testing.T) {
d := newTestDispenser(input)
assertNextBlock := func(shouldLoad bool, expectedCursor, expectedNesting int) {
- if loaded := d.NextBlock(); loaded != shouldLoad {
+ if loaded := d.NextBlock(0); loaded != shouldLoad {
t.Errorf("NextBlock(): Should return %v but got %v", shouldLoad, loaded)
}
if d.cursor != expectedCursor {