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* Indented strings.

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This commit is contained in:
Eelco Dolstra 2010-04-12 22:03:27 +00:00
parent a60317f20f
commit d4f0b0fc6c
7 changed files with 65 additions and 70 deletions
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1
src/libexpr/eval-test.cc
View file

@ -67,6 +67,7 @@ void run(Strings args)
doTest(state, "__add 1 2");
doTest(state, "null");
doTest(state, "\"foo\"");
doTest(state, "''\n foo\n bar\n ''");
doTest(state, "let s = \"bar\"; in \"foo${s}\"");
doTest(state, "if true then 1 else 2");
doTest(state, "if false then 1 else 2");

6
src/libexpr/eval.cc
View file

@ -367,6 +367,12 @@ bool EvalState::evalBool(Env & env, Expr * e)
}
void Expr::eval(EvalState & state, Env & env, Value & v)
{
abort();
}
void ExprInt::eval(EvalState & state, Env & env, Value & v)
{
mkInt(v, n);

19
src/libexpr/lexer.l
View file

@ -111,10 +111,11 @@ inherit { return INHERIT; }
\" { BEGIN(STRING); return '"'; }
<STRING>([^\$\"\\]|\$[^\{\"]|\\.)+ {
/* !!! Not quite right: we want a follow restriction on "$", it
shouldn't be followed by a "{". Right now "$\"" will be consumed
as part of a string, rather than a "$" followed by the string
terminator. Disallow "$\"" for now. */
/* !!! Not quite right: we want a follow restriction on
"$", it shouldn't be followed by a "{". Right now
"$\"" will be consumed as part of a string, rather
than a "$" followed by the string terminator.
Disallow "$\"" for now. */
yylval->e = unescapeStr(yytext);
return STR;
}
@ -124,25 +125,25 @@ inherit { return INHERIT; }
\'\'(\ *\n)? { BEGIN(IND_STRING); return IND_STRING_OPEN; }
<IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
//yylval->t = makeIndStr(toATerm(yytext));
yylval->e = new ExprIndStr(yytext);
return IND_STR;
}
<IND_STRING>\'\'\$ {
//yylval->t = makeIndStr(toATerm("$"));
yylval->e = new ExprIndStr("$");
return IND_STR;
}
<IND_STRING>\'\'\' {
//yylval->t = makeIndStr(toATerm("''"));
yylval->e = new ExprIndStr("''");
return IND_STR;
}
<IND_STRING>\'\'\\. {
//yylval->t = unescapeStr(yytext + 2);
yylval->e = new ExprIndStr(yytext + 2);
return IND_STR;
}
<IND_STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }
<IND_STRING>\'\' { BEGIN(INITIAL); return IND_STRING_CLOSE; }
<IND_STRING>\' {
//yylval->t = makeIndStr(toATerm("'"));
yylval->e = new ExprIndStr("'");
return IND_STR;
}
<IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */

19
src/libexpr/nixexpr.cc
View file

@ -15,6 +15,11 @@ std::ostream & operator << (std::ostream & str, Expr & e)
}
void Expr::show(std::ostream & str)
{
abort();
}
void ExprInt::show(std::ostream & str)
{
str << n;
@ -152,20 +157,6 @@ ATerm bottomupRewrite(TermFun & f, ATerm e)
}
Expr makeAttrs(const ATermMap & attrs)
{
ATermList bnds = ATempty;
for (ATermMap::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
Expr e;
ATerm pos;
if (!matchAttrRHS(i->value, e, pos))
abort(); /* can't happen */
bnds = ATinsert(bnds, makeBind(i->key, e, pos));
}
return makeAttrs(bnds);
}
static void varsBoundByPattern(ATermMap & map, Pattern pat)
{
ATerm name;

18
src/libexpr/nixexpr.hh
View file

@ -35,11 +35,8 @@ struct EvalState;
struct Expr
{
virtual void show(std::ostream & str) = 0;
virtual void eval(EvalState & state, Env & env, Value & v)
{
throw Error("not implemented");
}
virtual void show(std::ostream & str);
virtual void eval(EvalState & state, Env & env, Value & v);
};
std::ostream & operator << (std::ostream & str, Expr & e);
@ -62,6 +59,13 @@ struct ExprString : Expr
COMMON_METHODS
};
/* Temporary class used during parsing of indented strings. */
struct ExprIndStr : Expr
{
string s;
ExprIndStr(const string & s) : s(s) { };
};
struct ExprPath : Expr
{
string s;
@ -206,10 +210,6 @@ struct TermFun
ATerm bottomupRewrite(TermFun & f, ATerm e);
/* Create an attribute set expression from an Attrs value. */
Expr makeAttrs(const ATermMap & attrs);
/* Check whether all variables are defined in the given expression.
Throw an exception if this isn't the case. */
void checkVarDefs(const ATermMap & def, Expr e);

68
src/libexpr/parser.y
View file

@ -174,11 +174,12 @@ static void checkPatternVars(ATerm pos, Pattern pat)
ATermMap map;
checkPatternVars(pos, map, pat);
}
#endif
static Expr stripIndentation(ATermList es)
static Expr * stripIndentation(vector<Expr *> & es)
{
if (es == ATempty) return makeStr("");
if (es.empty()) return new ExprString("");
/* Figure out the minimum indentation. Note that by design
whitespace-only final lines are not taken into account. (So
@ -186,9 +187,9 @@ static Expr stripIndentation(ATermList es)
bool atStartOfLine = true; /* = seen only whitespace in the current line */
unsigned int minIndent = 1000000;
unsigned int curIndent = 0;
ATerm e;
for (ATermIterator i(es); i; ++i) {
if (!matchIndStr(*i, e)) {
foreach (vector<Expr *>::iterator, i, es) {
ExprIndStr * e = dynamic_cast<ExprIndStr *>(*i);
if (!e) {
/* Anti-quotations end the current start-of-line whitespace. */
if (atStartOfLine) {
atStartOfLine = false;
@ -196,12 +197,11 @@ static Expr stripIndentation(ATermList es)
}
continue;
}
string s = aterm2String(e);
for (unsigned int j = 0; j < s.size(); ++j) {
for (unsigned int j = 0; j < e->s.size(); ++j) {
if (atStartOfLine) {
if (s[j] == ' ')
if (e->s[j] == ' ')
curIndent++;
else if (s[j] == '\n') {
else if (e->s[j] == '\n') {
/* Empty line, doesn't influence minimum
indentation. */
curIndent = 0;
@ -209,7 +209,7 @@ static Expr stripIndentation(ATermList es)
atStartOfLine = false;
if (curIndent < minIndent) minIndent = curIndent;
}
} else if (s[j] == '\n') {
} else if (e->s[j] == '\n') {
atStartOfLine = true;
curIndent = 0;
}
@ -217,37 +217,37 @@ static Expr stripIndentation(ATermList es)
}
/* Strip spaces from each line. */
ATermList es2 = ATempty;
vector<Expr *> * es2 = new vector<Expr *>;
atStartOfLine = true;
unsigned int curDropped = 0;
unsigned int n = ATgetLength(es);
for (ATermIterator i(es); i; ++i, --n) {
if (!matchIndStr(*i, e)) {
unsigned int n = es.size();
for (vector<Expr *>::iterator i = es.begin(); i != es.end(); ++i, --n) {
ExprIndStr * e = dynamic_cast<ExprIndStr *>(*i);
if (!e) {
atStartOfLine = false;
curDropped = 0;
es2 = ATinsert(es2, *i);
es2->push_back(*i);
continue;
}
string s = aterm2String(e);
string s2;
for (unsigned int j = 0; j < s.size(); ++j) {
for (unsigned int j = 0; j < e->s.size(); ++j) {
if (atStartOfLine) {
if (s[j] == ' ') {
if (e->s[j] == ' ') {
if (curDropped++ >= minIndent)
s2 += s[j];
s2 += e->s[j];
}
else if (s[j] == '\n') {
else if (e->s[j] == '\n') {
curDropped = 0;
s2 += s[j];
s2 += e->s[j];
} else {
atStartOfLine = false;
curDropped = 0;
s2 += s[j];
s2 += e->s[j];
}
} else {
s2 += s[j];
if (s[j] == '\n') atStartOfLine = true;
s2 += e->s[j];
if (e->s[j] == '\n') atStartOfLine = true;
}
}
@ -259,12 +259,11 @@ static Expr stripIndentation(ATermList es)
s2 = string(s2, 0, p + 1);
}
es2 = ATinsert(es2, makeStr(s2));
es2->push_back(new ExprString(s2));
}
return makeConcatStrings(ATreverse(es2));
return new ExprConcatStrings(es2);
}
#endif
void backToString(yyscan_t scanner);
@ -316,11 +315,10 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
%type <e> expr_app expr_select expr_simple
%type <list> expr_list
%type <attrs> binds
%type <ts> attrpath ind_string_parts
%type <formals> formals
%type <formal> formal
%type <ids> ids
%type <string_parts> string_parts
%type <ids> ids attrpath
%type <string_parts> string_parts ind_string_parts
%token <id> ID ATTRPATH
%token <e> STR IND_STR
%token <n> INT
@ -411,11 +409,9 @@ expr_simple
else if ($2->size() == 1) $$ = $2->front();
else $$ = new ExprConcatStrings($2);
}
/*
| IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {
$$ = stripIndentation(ATreverse($2));
$$ = stripIndentation(*$2);
}
*/
| PATH { $$ = new ExprPath(absPath($1, data->basePath)); }
| URI { $$ = new ExprString($1); }
| '(' expr ')' { $$ = $2; }
@ -437,9 +433,9 @@ string_parts
;
ind_string_parts
: ind_string_parts IND_STR { $$ = ATinsert($1, $2); }
| ind_string_parts DOLLAR_CURLY expr '}' { backToIndString(scanner); $$ = ATinsert($1, $3); }
| { $$ = ATempty; }
: ind_string_parts IND_STR { $$ = $1; $1->push_back($2); }
| ind_string_parts DOLLAR_CURLY expr '}' { backToIndString(scanner); $$ = $1; $1->push_back($3); }
| { $$ = new vector<Expr *>; }
;
binds

2
src/nix-instantiate/nix-instantiate.cc
View file

@ -42,7 +42,7 @@ void processExpr(EvalState & state, const Strings & attrPaths,
bool evalOnly, bool xmlOutput, Expr * e)
{
if (parseOnly)
std::cout << format("%1%\n");
std::cout << format("%1%\n") % *e;
else
foreach (Strings::const_iterator, i, attrPaths) {
Value v;