diff options
Diffstat (limited to 'src/boot/utility.boot')
| -rw-r--r-- | src/boot/utility.boot | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/boot/utility.boot b/src/boot/utility.boot index 6dfdb668..ec51df12 100644 --- a/src/boot/utility.boot +++ b/src/boot/utility.boot @@ -49,7 +49,8 @@ module utility (objectMember?, symbolMember?, stringMember?, setDifference, setUnion, setIntersection, symbolAssoc, applySubst, applySubst!, applySubstNQ, objectAssoc, remove, removeSymbol, atomic?, every?, any?, take, takeWhile, drop, - copyTree, finishLine, stringSuffix?, findChar, charPosition) where + copyTree, finishLine, stringPrefix?, stringSuffix?, + findChar, charPosition) where substitute: (%Thing,%Thing,%Thing) -> %Thing substitute!: (%Thing,%Thing,%Thing) -> %Thing append: (%List %Thing,%List %Thing) -> %List %Thing @@ -75,6 +76,7 @@ module utility (objectMember?, symbolMember?, stringMember?, -- firstNonblankPosition: (%String,%Short) -> %Maybe %Short firstBlankPosition: (%String,%Short) -> %Maybe %Short stringSuffix?: (%String,%String) -> %Maybe %Short + stringPrefix?: (%String,%String) -> %Maybe %Short %defaultReadAndLoadSettings() @@ -371,6 +373,15 @@ stringSuffix?(suf,str) == and/[stringChar(suf,i) = stringChar(str,j) for i in 0..n1-1 for j in n..] => n nil +++ If the string `s1' is a prefix of `s2', return its length which is +++ also the one-past-the-last index into of the last character in `s2'; +++ otherise return nil. +stringPrefix?(s1,s2) == + n1 := #s1 + n1 > #s2 => nil + and/[s1.i = s2.i for i in 0..(n1-1)] => n1 + nil + --% I/O ++ Add a newline character and flush the output stream. |