42 lines
936 B
TypeScript
42 lines
936 B
TypeScript
export interface Pos {
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line: number;
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column: number;
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pos: number;
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name: string | null;
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fixed?: boolean;
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}
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export function startPos(name: string | null): Pos {
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return { line: 1, column: 0, pos: 0, name };
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}
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export function fixPos(p: Pos): Pos {
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return { ... p, fixed: true };
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}
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export function advancePos(p: Pos, ch: string): boolean {
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if (p.fixed ?? false) {
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return ch === '\n';
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} else {
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let advancedLine = false;
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p.pos++;
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switch (ch) {
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case '\t':
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p.column = (p.column + 8) & ~7;
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break;
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case '\n':
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p.column = 0;
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p.line++;
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advancedLine = true;
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break;
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case '\r':
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p.column = 0;
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break;
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default:
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p.column++;
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break;
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}
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return advancedLine;
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}
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}
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