llparse/lib/implementation/c/helpers/match-sequence.js

Compile incremental parsers to C code

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.MatchSequence = void 0;
const constants_1 = require("../constants");
class MatchSequence {
    transform;
    constructor(transform) {
        this.transform = transform;
    }
    static buildGlobals(out) {
        out.push('enum llparse_match_status_e {');
        out.push(`  ${constants_1.SEQUENCE_COMPLETE},`);
        out.push(`  ${constants_1.SEQUENCE_PAUSE},`);
        out.push(`  ${constants_1.SEQUENCE_MISMATCH}`);
        out.push('};');
        out.push('typedef enum llparse_match_status_e llparse_match_status_t;');
        out.push('');
        out.push('struct llparse_match_s {');
        out.push('  llparse_match_status_t status;');
        out.push('  const unsigned char* current;');
        out.push('};');
        out.push('typedef struct llparse_match_s llparse_match_t;');
    }
    getName() {
        return `llparse__match_sequence_${this.transform.ref.name}`;
    }
    build(ctx, out) {
        out.push(`static llparse_match_t ${this.getName()}(`);
        out.push(`    ${ctx.prefix}_t* s, const unsigned char* p,`);
        out.push('    const unsigned char* endp,');
        out.push('    const unsigned char* seq, uint32_t seq_len) {');
        // Vars
        out.push('  uint32_t index;');
        out.push('  llparse_match_t res;');
        out.push('');
        // Body
        out.push('  index = s->_index;');
        out.push('  for (; p != endp; p++) {');
        out.push('    unsigned char current;');
        out.push('');
        out.push(`    current = ${this.transform.build(ctx, '*p')};`);
        out.push('    if (current == seq[index]) {');
        out.push('      if (++index == seq_len) {');
        out.push(`        res.status = ${constants_1.SEQUENCE_COMPLETE};`);
        out.push('        goto reset;');
        out.push('      }');
        out.push('    } else {');
        out.push(`      res.status = ${constants_1.SEQUENCE_MISMATCH};`);
        out.push('      goto reset;');
        out.push('    }');
        out.push('  }');
        out.push('  s->_index = index;');
        out.push(`  res.status = ${constants_1.SEQUENCE_PAUSE};`);
        out.push('  res.current = p;');
        out.push('  return res;');
        out.push('reset:');
        out.push('  s->_index = 0;');
        out.push('  res.current = p;');
        out.push('  return res;');
        out.push('}');
    }
}
exports.MatchSequence = MatchSequence;
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