151 lines
3.5 KiB
Text
151 lines
3.5 KiB
Text
%option reentrant bison-bridge bison-locations
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%option noyywrap
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%option never-interactive
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%x STRING
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%{
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#include "aterm.hh"
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#include "nixexpr.hh"
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#include "nixexpr-ast.hh"
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#define BISON_HEADER_HACK
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#include "parser-tab.hh"
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using namespace nix;
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namespace nix {
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static void initLoc(YYLTYPE * loc)
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{
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loc->first_line = 1;
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loc->first_column = 1;
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}
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static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
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{
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while (len--) {
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switch (*s++) {
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case '\r':
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if (*s == '\n') /* cr/lf */
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s++;
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/* fall through */
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case '\n':
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++loc->first_line;
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loc->first_column = 1;
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break;
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default:
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++loc->first_column;
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}
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}
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}
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static Expr unescapeStr(const char * s)
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{
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string t;
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char c;
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while ((c = *s++)) {
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if (c == '\\') {
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assert(*s);
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c = *s++;
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if (c == 'n') t += '\n';
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else if (c == 'r') t += '\r';
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else if (c == 't') t += '\t';
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else t += c;
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}
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else if (c == '\r') {
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/* Normalise CR and CR/LF into LF. */
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t += '\n';
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if (*s == '\n') s++; /* cr/lf */
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}
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else t += c;
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}
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return makeStr(toATerm(t));
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}
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}
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#define YY_USER_INIT initLoc(yylloc)
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#define YY_USER_ACTION adjustLoc(yylloc, yytext, yyleng);
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%}
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ID [a-zA-Z\_][a-zA-Z0-9\_\']*
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INT [0-9]+
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PATH [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+
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URI [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']+
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%%
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if { return IF; }
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then { return THEN; }
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else { return ELSE; }
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assert { return ASSERT; }
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with { return WITH; }
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let { return LET; }
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in { return IN; }
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rec { return REC; }
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inherit { return INHERIT; }
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\=\= { return EQ; }
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\!\= { return NEQ; }
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\&\& { return AND; }
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\|\| { return OR; }
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\-\> { return IMPL; }
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\/\/ { return UPDATE; }
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\+\+ { return CONCAT; }
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{ID} { yylval->t = toATerm(yytext); return ID; /* !!! alloc */ }
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{INT} { int n = atoi(yytext); /* !!! overflow */
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yylval->t = ATmake("<int>", n);
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return INT;
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}
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\" { BEGIN(STRING); return '"'; }
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<STRING>([^\$\"\\]|\$[^\{\"]|\\.)+ {
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/* !!! Not quite right: we want a follow restriction on "$", it
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shouldn't be followed by a "{". Right now "$\"" will be consumed
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as part of a string, rather than a "$" followed by the string
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terminator. Disallow "$\"" for now. */
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yylval->t = unescapeStr(yytext); /* !!! alloc */
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return STR;
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}
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<STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }
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<STRING>\" { BEGIN(INITIAL); return '"'; }
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<STRING>. return yytext[0]; /* just in case: shouldn't be reached */
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{PATH} { yylval->t = toATerm(yytext); return PATH; /* !!! alloc */ }
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{URI} { yylval->t = toATerm(yytext); return URI; /* !!! alloc */ }
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[ \t\r\n]+ /* eat up whitespace */
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\#[^\r\n]* /* single-line comments */
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\/\*([^*]|\*[^\/])*\*\/ /* long comments */
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. return yytext[0];
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%%
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namespace nix {
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/* Horrible, disgusting hack: allow the parser to set the scanner
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start condition back to STRING. Necessary in interpolations like
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"foo${expr}bar"; after the close brace we have to go back to the
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STRING state. */
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void backToString(yyscan_t scanner)
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{
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struct yyguts_t * yyg = (struct yyguts_t *) scanner;
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BEGIN(STRING);
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}
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}
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