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Merge pull request #481 from blackwhale/regex-fix-parser

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fix unreported bug in std.regex parser
This commit is contained in:
David Simcha 2012-03-15 19:13:48 -07:00
commit 8ed20feaf7
1 changed files with 21 additions and 12 deletions
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29
std/regex.d
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@ -227,7 +227,7 @@ import core.bitop, core.stdc.string, core.stdc.stdlib;
import ascii = std.ascii;
import std.string : representation;
version(unittest) debug import std.stdio;
debug import std.stdio;
private:
@safe:
@ -1148,15 +1148,23 @@ struct Parser(R, bool CTFE=false)
put(Bytecode(IR.Option, 0));
break;
}
uint len, orStart;
//start a new option
if(fixupStack.length == 1)//only root entry
fix = -1;
uint len = cast(uint)ir.length - fix;
insertInPlaceAlt(ir, fix+1, Bytecode(IR.OrStart, 0), Bytecode(IR.Option, len));
assert(ir[fix+1].code == IR.OrStart);
if(fixupStack.length == 1)
{//only root entry, effectively no fixup
len = cast(uint)ir.length + IRL!(IR.GotoEndOr);
orStart = 0;
}
else
{//IR.lookahead, etc. fixups that have length > 1, thus check ir[x].length
len = cast(uint)ir.length - fix - (ir[fix].length - 1);
orStart = fix + ir[fix].length;
}
insertInPlaceAlt(ir, orStart, Bytecode(IR.OrStart, 0), Bytecode(IR.Option, len));
assert(ir[orStart].code == IR.OrStart);
put(Bytecode(IR.GotoEndOr, 0));
fixupStack.push(fix+1); //fixup for StartOR
fixupStack.push(cast(uint)ir.length); //for Option
fixupStack.push(orStart); //fixup for StartOR
fixupStack.push(cast(uint)ir.length); //for second Option
put(Bytecode(IR.Option, 0));
break;
default://no groups or whatever
@ -2117,7 +2125,6 @@ private:
//print out disassembly a program's IR
@trusted debug public void print() const
{//@@@BUG@@@ write is system
import std.stdio;
writefln("PC\tINST\n");
prettyPrint(delegate void(const(char)[] s){ write(s); },ir);
writefln("\n");
@ -4041,7 +4048,7 @@ template BacktrackingMatcher(bool CTregex)
pc -= len;
assert(re.ir[pc].code == IR.Option);
len = re.ir[pc].data;
auto pc_save = pc+len-1;
auto pc_save = pc+len-IRL!(IR.GotoEndOr);
pc = pc + len + IRL!(IR.Option);
while(re.ir[pc].code == IR.Option)
{
@ -7121,6 +7128,8 @@ unittest
TestVectors( `a(?<=(ba(?<=(aba)(?<=aaba))))`, "aabaa", "y", "$&-$1-$2", "a-ba-aba"),
TestVectors( `.(?<!b).`, "bax", "y", "$&", "ax"),
TestVectors( `(?<=b(?<!ab)).`, "abbx", "y", "$&", "x"),
TestVectors( `(?<=\.|[!?]+)X`, "Hey?!X", "y", "$&", "X"),
TestVectors( `(?<=\.|[!?]+)a{3}`, ".Nope.aaaX", "y", "$&", "aaa"),
//mixed lookaround
TestVectors( `a(?<=a(?=b))b`, "ab", "y", "$&", "ab"),
TestVectors( `a(?<=a(?!b))c`, "ac", "y", "$&", "ac"),