77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
extern "C" {
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#include <sglr.h>
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#include <asfix2.h>
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}
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#include "parser.hh"
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#include "shared.hh"
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#include "expr.hh"
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#include "parse-table.h"
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Expr parseExprFromFile(const Path & path)
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{
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/* Perhaps this is already an imploded parse tree? */
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Expr e = ATreadFromNamedFile(path.c_str());
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if (e) return e;
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/* Initialise the SDF libraries. */
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static bool initialised = false;
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static ATerm parseTable = 0;
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static language lang = 0;
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if (!initialised) {
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PT_initMEPTApi();
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PT_initAsFix2Api();
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SGinitParser(ATfalse);
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ATprotect(&parseTable);
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parseTable = ATreadFromBinaryString(
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(char *) fixParseTable, sizeof fixParseTable);
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if (!parseTable)
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throw Error(format("cannot construct parse table term"));
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ATprotect(&lang);
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lang = ATmake("Fix");
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if (!SGopenLanguageFromTerm(
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(char *) programId.c_str(), lang, parseTable))
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throw Error(format("cannot open language"));
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SG_STARTSYMBOL_ON();
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SG_OUTPUT_ON();
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SG_ASFIX2ME_ON();
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SG_AMBIGUITY_ERROR_ON();
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initialised = true;
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}
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ATerm result = SGparseFile((char *) programId.c_str(), lang,
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"Expr", (char *) path.c_str());
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if (!result)
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throw SysError(format("parse failed in `%1%'") % path);
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if (SGisParseError(result))
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throw Error(format("parse error in `%1%': %2%")
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% path % printTerm(result));
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PT_ParseTree tree = PT_makeParseTreeFromTerm(result);
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if (!tree)
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throw Error(format("cannot create parse tree"));
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ATerm imploded = PT_implodeParseTree(tree,
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ATtrue,
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ATtrue,
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ATtrue,
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ATtrue,
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ATtrue,
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ATtrue,
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ATfalse,
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ATtrue,
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ATtrue,
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ATtrue,
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ATfalse);
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if (!imploded)
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throw Error(format("cannot implode parse tree"));
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return imploded;
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}
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