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29 lines
817 B
JavaScript
29 lines
817 B
JavaScript
"use strict";
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const { NoMatch, NotEnoughInput } = require("../symbols");
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module.exports = function* until(instruction, state, context) {
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while (state.currentIndex < state.currentInput.length) {
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let attemptIndex = state.currentIndex;
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let result = yield instruction.rule;
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if (result === NoMatch) {
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state.currentIndex += 1;
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continue;
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} else {
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// Un-consume the terminator we've matched, and continue parsing other rules
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state.currentIndex = attemptIndex;
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if (state.currentIndex > context.startIndex) {
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return state.currentInput.slice(context.startIndex, state.currentIndex);
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} else {
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// Zero-width match; that's a fail
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return NoMatch;
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}
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}
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}
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// Reached the end of the currently available input, and we still haven't encountered our terminator
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return NotEnoughInput;
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};
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