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Merge branch 'simplify-lexer' of https://github.com/layus/nix

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This commit is contained in:
Eelco Dolstra 2018-10-27 13:42:06 +02:00
commit 1427958b3c
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1 changed files with 15 additions and 18 deletions
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33
src/libexpr/lexer.l
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@ -6,9 +6,9 @@
%option nounput noyy_top_state
%s DEFAULT
%x STRING
%x IND_STRING
%x INSIDE_DOLLAR_CURLY
%{
@ -99,8 +99,6 @@ URI [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~
%%
<INITIAL,INSIDE_DOLLAR_CURLY>{
if { return IF; }
then { return THEN; }
@ -140,17 +138,19 @@ or { return OR_KW; }
return FLOAT;
}
\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
}
\$\{ { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
\} { return '}'; }
<INSIDE_DOLLAR_CURLY>\} { POP_STATE(); return '}'; }
\{ { return '{'; }
<INSIDE_DOLLAR_CURLY>\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return '{'; }
\} { /* State INITIAL only exists at the bottom of the stack and is
used as a marker. DEFAULT replaces it everywhere else.
Popping when in INITIAL state causes an empty stack exception,
so don't */
if (YYSTATE != INITIAL)
POP_STATE();
return '}';
}
\{ { PUSH_STATE(DEFAULT); return '{'; }
<INITIAL,INSIDE_DOLLAR_CURLY>\" {
PUSH_STATE(STRING); return '"';
}
\" { PUSH_STATE(STRING); return '"'; }
<STRING>([^\$\"\\]|\$[^\{\"\\]|\\{ANY}|\$\\{ANY})*\$/\" |
<STRING>([^\$\"\\]|\$[^\{\"\\]|\\{ANY}|\$\\{ANY})+ {
/* It is impossible to match strings ending with '$' with one
@ -159,7 +159,7 @@ or { return OR_KW; }
yylval->e = unescapeStr(data->symbols, yytext, yyleng);
return STR;
}
<STRING>\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
<STRING>\$\{ { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
<STRING>\" { POP_STATE(); return '"'; }
<STRING>\$|\\|\$\\ {
/* This can only occur when we reach EOF, otherwise the above
@ -169,7 +169,7 @@ or { return OR_KW; }
return STR;
}
<INITIAL,INSIDE_DOLLAR_CURLY>\'\'(\ *\n)? { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; }
\'\'(\ *\n)? { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; }
<IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
yylval->e = new ExprIndStr(yytext);
return IND_STR;
@ -187,14 +187,13 @@ or { return OR_KW; }
yylval->e = unescapeStr(data->symbols, yytext + 2, yyleng - 2);
return IND_STR;
}
<IND_STRING>\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
<IND_STRING>\$\{ { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
<IND_STRING>\'\' { POP_STATE(); return IND_STRING_CLOSE; }
<IND_STRING>\' {
yylval->e = new ExprIndStr("'");
return IND_STR;
}
<INITIAL,INSIDE_DOLLAR_CURLY>{
{PATH} { if (yytext[yyleng-1] == '/')
throw ParseError("path '%s' has a trailing slash", yytext);
@ -219,7 +218,5 @@ or { return OR_KW; }
return (unsigned char) yytext[0];
}
}
%%