From db5e284073ce1f951343c5825a7e4d64d159582b Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Thu, 1 Oct 2009 00:23:57 +0000
Subject: [PATCH] Unified scanner state.

---
 Cycript.l  | 202 +++++++++++++++++++++++++++--------------------------
 Library.mm |   6 +-
 Parser.hpp |   9 ++-
 3 files changed, 111 insertions(+), 106 deletions(-)

diff --git a/Cycript.l b/Cycript.l
index 45dbe3e..08b7cd5 100644
--- a/Cycript.l
+++ b/Cycript.l
@@ -2,9 +2,11 @@
 #include "Cycript.tab.hh"
 typedef cy::parser::token tk;
 #define YY_EXTRA_TYPE CYDriver *
-#define N yylval->newline_ = yyextra->newline_; yyextra->newline_ = false; yyextra->restricted_ = false;
-#define R yyextra->restricted_ = true;
-#define L { bool restricted(yyextra->restricted_); yyextra->restricted_ = false; if (restricted) return tk::NewLine; else yyextra->newline_ = true; }
+
+#define T yylval->newline_ = yyextra->state_ == CYNewLine;
+#define C T yyextra->state_ = CYClear;
+#define R T yyextra->state_ = CYRestricted;
+#define N { bool restricted(yyextra->state_ == CYRestricted); if (restricted) { yyextra->state_ = CYClear; return tk::NewLine; } else yyextra->state_ = CYNewLine; }
 %}
 
 %option prefix="cy"
@@ -22,103 +24,103 @@ Escape   \\['"\\bfnrtv]|\\0|\\x[0-9a-fA-F]{2}|\\u[0-9a-fA-F]{4}
 %%
 
 \/\/[^\n]* ;
-\/\*(\n|[^\*]|\*[^/])\*\/ if (memchr(yytext, '\n', yyleng) != NULL) L // XXX: supposedly I will be screwed on very very long multi-line comments and need to replace this with a manual lexer. http://websrv.cs.fsu.edu/~engelen/courses/COP5621/Pr2.pdf ; XXX: this rule doesn't work anyway, fucking A :(
-
-"&"    N return tk::Ampersand;
-"&&"   N return tk::AmpersandAmpersand;
-"&="   N return tk::AmpersandEqual;
-"^"    N return tk::Carrot;
-"^="   N return tk::CarrotEqual;
-"="    N return tk::Equal;
-"=="   N return tk::EqualEqual;
-"==="  N return tk::EqualEqualEqual;
-"!"    N return tk::Exclamation;
-"!="   N return tk::ExclamationEqual;
-"!=="  N return tk::ExclamationEqualEqual;
-"-"    N return tk::Hyphen;
-"-="   N return tk::HyphenEqual;
-"--"   N return yylval->newline_ ? tk::HyphenHyphen_ : tk::HyphenHyphen;
-"->"   N return tk::HyphenRight;
-"<"    N return tk::Left;
-"<="   N return tk::LeftEqual;
-"<<"   N return tk::LeftLeft;
-"<<="  N return tk::LeftLeftEqual;
-"%"    N return tk::Percent;
-"%="   N return tk::PercentEqual;
-"."    N return tk::Period;
-"|"    N return tk::Pipe;
-"|="   N return tk::PipeEqual;
-"||"   N return tk::PipePipe;
-"+"    N return tk::Plus;
-"+="   N return tk::PlusEqual;
-"++"   N return yylval->newline_ ? tk::PlusPlus_ : tk::PlusPlus;
-">"    N return tk::Right;
-">="   N return tk::RightEqual;
-">>"   N return tk::RightRight;
-">>="  N return tk::RightRightEqual;
-">>>"  N return tk::RightRightRight;
-">>>=" N return tk::RightRightRightEqual;
-"/"    N return tk::Slash;
-"/="   N return tk::SlashEqual;
-"*"    N return tk::Star;
-"*="   N return tk::StarEqual;
-"~"    N return tk::Tilde;
-
-":"    N return tk::Colon;
-","    N return tk::Comma;
-"?"    N return tk::Question;
-";"    N return tk::SemiColon;
-
-"("    N return tk::OpenParen;
-")"    N return tk::CloseParen;
-
-"{"    N return tk::OpenBrace;
-"}"    N return tk::CloseBrace;
-
-"["    N return tk::OpenBracket;
-"]"    N return tk::CloseBracket;
-
-"break"      N R yylval->word_ = new CYWord("break"); return tk::Break;
-"case"       N yylval->word_ = new CYWord("case"); return tk::Case;
-"catch"      N yylval->word_ = new CYWord("catch"); return tk::Catch;
-"continue"   N R yylval->word_ = new CYWord("continue"); return tk::Continue;
-"default"    N yylval->word_ = new CYWord("default"); return tk::Default;
-"delete"     N yylval->word_ = new CYWord("delete"); return tk::Delete;
-"do"         N yylval->word_ = new CYWord("do"); return tk::Do;
-"else"       N yylval->word_ = new CYWord("else"); return tk::Else;
-"false"      N yylval->false_ = new CYFalse(); return tk::False;
-"finally"    N yylval->word_ = new CYWord("finally"); return tk::Finally;
-"for"        N yylval->word_ = new CYWord("for"); return tk::For;
-"function"   N yylval->word_ = new CYWord("function"); return tk::Function;
-"if"         N yylval->word_ = new CYWord("if"); return tk::If;
-"in"         N yylval->word_ = new CYWord("in"); return tk::In;
-"instanceof" N yylval->word_ = new CYWord("instanceof"); return tk::InstanceOf;
-"new"        N yylval->word_ = new CYWord("new"); return tk::New;
-"null"       N yylval->null_ = new CYNull(); return tk::Null;
-"return"     N R yylval->word_ = new CYWord("return"); return tk::Return;
-"switch"     N yylval->word_ = new CYWord("switch"); return tk::Switch;
-"this"       N yylval->this_ = new CYThis(); return tk::This;
-"throw"      N R yylval->word_ = new CYWord("throw"); return tk::Throw;
-"true"       N yylval->true_ = new CYTrue(); return tk::True;
-"try"        N yylval->word_ = new CYWord("try"); return tk::Try;
-"typeof"     N yylval->word_ = new CYWord("typeof"); return tk::TypeOf;
-"var"        N yylval->word_ = new CYWord("var"); return tk::Var;
-"void"       N yylval->word_ = new CYWord("void"); return tk::Void;
-"while"      N yylval->word_ = new CYWord("while"); return tk::While;
-"with"       N yylval->word_ = new CYWord("with"); return tk::With;
-
-[a-zA-Z$_][a-zA-Z$_0-9]* yylval->identifier_ = new CYIdentifier(apr_pstrmemdup(yyextra->pool_, yytext, yyleng)); N return tk::Identifier;
-
-(\.[0-9]+|(0|[1-9][0-9]*)(\.[0-9]*)?){Exponent}? yylval->number_ = new CYNumber(strtod(yytext, NULL)); N return tk::NumericLiteral;
-
-0[xX][0-9a-fA-F]+ N yylval->number_ = new CYNumber(strtoull(yytext + 2, NULL, 16)); return tk::NumericLiteral;
-
-0[bB][0-1]+ N yylval->number_ = new CYNumber(strtoull(yytext + 2, NULL, 2)); return tk::NumericLiteral;
-
-\"([^"\\\n]|{Escape})*\" N return tk::StringLiteral;
-'([^'\\\n]|{Escape})*' N return tk::StringLiteral;
-
-\n L
+\/\*(\n|[^\*]|\*[^/])\*\/ if (memchr(yytext, '\n', yyleng) != NULL) N // XXX: supposedly I will be screwed on very very long multi-line comments and need to replace this with a manual lexer. http://websrv.cs.fsu.edu/~engelen/courses/COP5621/Pr2.pdf ; XXX: this rule doesn't work anyway, fucking A :(
+
+"&"    C return tk::Ampersand;
+"&&"   C return tk::AmpersandAmpersand;
+"&="   C return tk::AmpersandEqual;
+"^"    C return tk::Carrot;
+"^="   C return tk::CarrotEqual;
+"="    C return tk::Equal;
+"=="   C return tk::EqualEqual;
+"==="  C return tk::EqualEqualEqual;
+"!"    C return tk::Exclamation;
+"!="   C return tk::ExclamationEqual;
+"!=="  C return tk::ExclamationEqualEqual;
+"-"    C return tk::Hyphen;
+"-="   C return tk::HyphenEqual;
+"--"   C return yylval->newline_ ? tk::HyphenHyphen_ : tk::HyphenHyphen;
+"->"   C return tk::HyphenRight;
+"<"    C return tk::Left;
+"<="   C return tk::LeftEqual;
+"<<"   C return tk::LeftLeft;
+"<<="  C return tk::LeftLeftEqual;
+"%"    C return tk::Percent;
+"%="   C return tk::PercentEqual;
+"."    C return tk::Period;
+"|"    C return tk::Pipe;
+"|="   C return tk::PipeEqual;
+"||"   C return tk::PipePipe;
+"+"    C return tk::Plus;
+"+="   C return tk::PlusEqual;
+"++"   C return yylval->newline_ ? tk::PlusPlus_ : tk::PlusPlus;
+">"    C return tk::Right;
+">="   C return tk::RightEqual;
+">>"   C return tk::RightRight;
+">>="  C return tk::RightRightEqual;
+">>>"  C return tk::RightRightRight;
+">>>=" C return tk::RightRightRightEqual;
+"/"    C return tk::Slash;
+"/="   C return tk::SlashEqual;
+"*"    C return tk::Star;
+"*="   C return tk::StarEqual;
+"~"    C return tk::Tilde;
+
+":"    C return tk::Colon;
+","    C return tk::Comma;
+"?"    C return tk::Question;
+";"    C return tk::SemiColon;
+
+"("    C return tk::OpenParen;
+")"    C return tk::CloseParen;
+
+"{"    C return tk::OpenBrace;
+"}"    C return tk::CloseBrace;
+
+"["    C return tk::OpenBracket;
+"]"    C return tk::CloseBracket;
+
+"break"      R yylval->word_ = new CYWord("break"); return tk::Break;
+"case"       C yylval->word_ = new CYWord("case"); return tk::Case;
+"catch"      C yylval->word_ = new CYWord("catch"); return tk::Catch;
+"continue"   R yylval->word_ = new CYWord("continue"); return tk::Continue;
+"default"    C yylval->word_ = new CYWord("default"); return tk::Default;
+"delete"     C yylval->word_ = new CYWord("delete"); return tk::Delete;
+"do"         C yylval->word_ = new CYWord("do"); return tk::Do;
+"else"       C yylval->word_ = new CYWord("else"); return tk::Else;
+"false"      C yylval->false_ = new CYFalse(); return tk::False;
+"finally"    C yylval->word_ = new CYWord("finally"); return tk::Finally;
+"for"        C yylval->word_ = new CYWord("for"); return tk::For;
+"function"   C yylval->word_ = new CYWord("function"); return tk::Function;
+"if"         C yylval->word_ = new CYWord("if"); return tk::If;
+"in"         C yylval->word_ = new CYWord("in"); return tk::In;
+"instanceof" C yylval->word_ = new CYWord("instanceof"); return tk::InstanceOf;
+"new"        C yylval->word_ = new CYWord("new"); return tk::New;
+"null"       C yylval->null_ = new CYNull(); return tk::Null;
+"return"     R yylval->word_ = new CYWord("return"); return tk::Return;
+"switch"     C yylval->word_ = new CYWord("switch"); return tk::Switch;
+"this"       C yylval->this_ = new CYThis(); return tk::This;
+"throw"      R yylval->word_ = new CYWord("throw"); return tk::Throw;
+"true"       C yylval->true_ = new CYTrue(); return tk::True;
+"try"        C yylval->word_ = new CYWord("try"); return tk::Try;
+"typeof"     C yylval->word_ = new CYWord("typeof"); return tk::TypeOf;
+"var"        C yylval->word_ = new CYWord("var"); return tk::Var;
+"void"       C yylval->word_ = new CYWord("void"); return tk::Void;
+"while"      C yylval->word_ = new CYWord("while"); return tk::While;
+"with"       C yylval->word_ = new CYWord("with"); return tk::With;
+
+[a-zA-Z$_][a-zA-Z$_0-9]* yylval->identifier_ = new CYIdentifier(apr_pstrmemdup(yyextra->pool_, yytext, yyleng)); C return tk::Identifier;
+
+(\.[0-9]+|(0|[1-9][0-9]*)(\.[0-9]*)?){Exponent}? yylval->number_ = new CYNumber(strtod(yytext, NULL)); C return tk::NumericLiteral;
+
+0[xX][0-9a-fA-F]+ C yylval->number_ = new CYNumber(strtoull(yytext + 2, NULL, 16)); return tk::NumericLiteral;
+
+0[bB][0-1]+ C yylval->number_ = new CYNumber(strtoull(yytext + 2, NULL, 2)); return tk::NumericLiteral;
+
+\"([^"\\\n]|{Escape})*\" C return tk::StringLiteral;
+'([^'\\\n]|{Escape})*' C return tk::StringLiteral;
+
+\n N
 [ \t] ;
 
 %%
diff --git a/Library.mm b/Library.mm
index 425c8e2..b818ad2 100644
--- a/Library.mm
+++ b/Library.mm
@@ -918,8 +918,7 @@ static JSStaticValue Pointer_staticValues[2] = {
 };
 
 CYDriver::CYDriver(const std::string &filename) :
-    newline_(false),
-    restricted_(false),
+    state_(CYClear),
     filename_(filename),
     source_(NULL)
 {
@@ -931,8 +930,7 @@ CYDriver::~CYDriver() {
 }
 
 void CYDriver::Clear() {
-    newline_ = false;
-    restricted_ = false;
+    state_ = CYClear;
     source_.clear();
     pool_.Clear();
 }
diff --git a/Parser.hpp b/Parser.hpp
index 6de5888..d7322aa 100644
--- a/Parser.hpp
+++ b/Parser.hpp
@@ -99,11 +99,16 @@ struct CYStatement :
     }
 };
 
+enum CYState {
+    CYClear,
+    CYRestricted,
+    CYNewLine
+};
+
 class CYDriver {
   public:
     CYPool pool_;
-    bool newline_;
-    bool restricted_;
+    CYState state_;
     std::string filename_;
     std::vector<CYSource *> source_;
     void *scanner_;
-- 
2.45.2