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22 lines
836 B
JavaScript
22 lines
836 B
JavaScript
"use strict";
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const { NotEnoughInput, NoMatch } = require("../symbols");
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module.exports = function* characterRange(instruction, state) {
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let { start, end } = instruction;
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// FIXME: Unicode only! Need to check if we can assume that strings are always unicode, even when the source data was interpreted as another string encoding
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let codepoint = state.currentInput.codePointAt(state.currentIndex);
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// FIXME: Find a way to do this generically without breaking the EndOfInput operation
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if (state.currentIndex === state.currentInput.length) {
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return NotEnoughInput;
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} else if (codepoint >= start && codepoint <= end) {
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// TODO: Should we return the codepoint in string form here? That will be unnecessary work in most cases where `wholeMatch` will be used
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state.currentIndex += 1;
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return;
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} else {
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return NoMatch;
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}
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};
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