1 files changed, 345 insertions, 0 deletions
diff --git a/vanilla/node_modules/@jridgewell/sourcemap-codec/src/scopes.ts b/vanilla/node_modules/@jridgewell/sourcemap-codec/src/scopes.ts
new file mode 100644
index 0000000..d194c2f
--- /dev/null
+++ b/vanilla/node_modules/@jridgewell/sourcemap-codec/src/scopes.ts
@@ -0,0 +1,345 @@
+import { StringReader, StringWriter } from './strings';
+import { comma, decodeInteger, encodeInteger, hasMoreVlq, semicolon } from './vlq';
+
+const EMPTY: any[] = [];
+
+type Line = number;
+type Column = number;
+type Kind = number;
+type Name = number;
+type Var = number;
+type SourcesIndex = number;
+type ScopesIndex = number;
+
+type Mix<A, B, O> = (A & O) | (B & O);
+
+export type OriginalScope = Mix<
+  [Line, Column, Line, Column, Kind],
+  [Line, Column, Line, Column, Kind, Name],
+  { vars: Var[] }
+>;
+
+export type GeneratedRange = Mix<
+  [Line, Column, Line, Column],
+  [Line, Column, Line, Column, SourcesIndex, ScopesIndex],
+  {
+    callsite: CallSite | null;
+    bindings: Binding[];
+    isScope: boolean;
+  }
+>;
+export type CallSite = [SourcesIndex, Line, Column];
+type Binding = BindingExpressionRange[];
+export type BindingExpressionRange = [Name] | [Name, Line, Column];
+
+export function decodeOriginalScopes(input: string): OriginalScope[] {
+  const { length } = input;
+  const reader = new StringReader(input);
+  const scopes: OriginalScope[] = [];
+  const stack: OriginalScope[] = [];
+  let line = 0;
+
+  for (; reader.pos < length; reader.pos++) {
+    line = decodeInteger(reader, line);
+    const column = decodeInteger(reader, 0);
+
+    if (!hasMoreVlq(reader, length)) {
+      const last = stack.pop()!;
+      last[2] = line;
+      last[3] = column;
+      continue;
+    }
+
+    const kind = decodeInteger(reader, 0);
+    const fields = decodeInteger(reader, 0);
+    const hasName = fields & 0b0001;
+
+    const scope: OriginalScope = (
+      hasName ? [line, column, 0, 0, kind, decodeInteger(reader, 0)] : [line, column, 0, 0, kind]
+    ) as OriginalScope;
+
+    let vars: Var[] = EMPTY;
+    if (hasMoreVlq(reader, length)) {
+      vars = [];
+      do {
+        const varsIndex = decodeInteger(reader, 0);
+        vars.push(varsIndex);
+      } while (hasMoreVlq(reader, length));
+    }
+    scope.vars = vars;
+
+    scopes.push(scope);
+    stack.push(scope);
+  }
+
+  return scopes;
+}
+
+export function encodeOriginalScopes(scopes: OriginalScope[]): string {
+  const writer = new StringWriter();
+
+  for (let i = 0; i < scopes.length; ) {
+    i = _encodeOriginalScopes(scopes, i, writer, [0]);
+  }
+
+  return writer.flush();
+}
+
+function _encodeOriginalScopes(
+  scopes: OriginalScope[],
+  index: number,
+  writer: StringWriter,
+  state: [
+    number, // GenColumn
+  ],
+): number {
+  const scope = scopes[index];
+  const { 0: startLine, 1: startColumn, 2: endLine, 3: endColumn, 4: kind, vars } = scope;
+
+  if (index > 0) writer.write(comma);
+
+  state[0] = encodeInteger(writer, startLine, state[0]);
+  encodeInteger(writer, startColumn, 0);
+  encodeInteger(writer, kind, 0);
+
+  const fields = scope.length === 6 ? 0b0001 : 0;
+  encodeInteger(writer, fields, 0);
+  if (scope.length === 6) encodeInteger(writer, scope[5], 0);
+
+  for (const v of vars) {
+    encodeInteger(writer, v, 0);
+  }
+
+  for (index++; index < scopes.length; ) {
+    const next = scopes[index];
+    const { 0: l, 1: c } = next;
+    if (l > endLine || (l === endLine && c >= endColumn)) {
+      break;
+    }
+    index = _encodeOriginalScopes(scopes, index, writer, state);
+  }
+
+  writer.write(comma);
+  state[0] = encodeInteger(writer, endLine, state[0]);
+  encodeInteger(writer, endColumn, 0);
+
+  return index;
+}
+
+export function decodeGeneratedRanges(input: string): GeneratedRange[] {
+  const { length } = input;
+  const reader = new StringReader(input);
+  const ranges: GeneratedRange[] = [];
+  const stack: GeneratedRange[] = [];
+
+  let genLine = 0;
+  let definitionSourcesIndex = 0;
+  let definitionScopeIndex = 0;
+  let callsiteSourcesIndex = 0;
+  let callsiteLine = 0;
+  let callsiteColumn = 0;
+  let bindingLine = 0;
+  let bindingColumn = 0;
+
+  do {
+    const semi = reader.indexOf(';');
+    let genColumn = 0;
+
+    for (; reader.pos < semi; reader.pos++) {
+      genColumn = decodeInteger(reader, genColumn);
+
+      if (!hasMoreVlq(reader, semi)) {
+        const last = stack.pop()!;
+        last[2] = genLine;
+        last[3] = genColumn;
+        continue;
+      }
+
+      const fields = decodeInteger(reader, 0);
+      const hasDefinition = fields & 0b0001;
+      const hasCallsite = fields & 0b0010;
+      const hasScope = fields & 0b0100;
+
+      let callsite: CallSite | null = null;
+      let bindings: Binding[] = EMPTY;
+      let range: GeneratedRange;
+      if (hasDefinition) {
+        const defSourcesIndex = decodeInteger(reader, definitionSourcesIndex);
+        definitionScopeIndex = decodeInteger(
+          reader,
+          definitionSourcesIndex === defSourcesIndex ? definitionScopeIndex : 0,
+        );
+
+        definitionSourcesIndex = defSourcesIndex;
+        range = [genLine, genColumn, 0, 0, defSourcesIndex, definitionScopeIndex] as GeneratedRange;
+      } else {
+        range = [genLine, genColumn, 0, 0] as GeneratedRange;
+      }
+
+      range.isScope = !!hasScope;
+
+      if (hasCallsite) {
+        const prevCsi = callsiteSourcesIndex;
+        const prevLine = callsiteLine;
+        callsiteSourcesIndex = decodeInteger(reader, callsiteSourcesIndex);
+        const sameSource = prevCsi === callsiteSourcesIndex;
+        callsiteLine = decodeInteger(reader, sameSource ? callsiteLine : 0);
+        callsiteColumn = decodeInteger(
+          reader,
+          sameSource && prevLine === callsiteLine ? callsiteColumn : 0,
+        );
+
+        callsite = [callsiteSourcesIndex, callsiteLine, callsiteColumn];
+      }
+      range.callsite = callsite;
+
+      if (hasMoreVlq(reader, semi)) {
+        bindings = [];
+        do {
+          bindingLine = genLine;
+          bindingColumn = genColumn;
+          const expressionsCount = decodeInteger(reader, 0);
+          let expressionRanges: BindingExpressionRange[];
+          if (expressionsCount < -1) {
+            expressionRanges = [[decodeInteger(reader, 0)]];
+            for (let i = -1; i > expressionsCount; i--) {
+              const prevBl = bindingLine;
+              bindingLine = decodeInteger(reader, bindingLine);
+              bindingColumn = decodeInteger(reader, bindingLine === prevBl ? bindingColumn : 0);
+              const expression = decodeInteger(reader, 0);
+              expressionRanges.push([expression, bindingLine, bindingColumn]);
+            }
+          } else {
+            expressionRanges = [[expressionsCount]];
+          }
+          bindings.push(expressionRanges);
+        } while (hasMoreVlq(reader, semi));
+      }
+      range.bindings = bindings;
+
+      ranges.push(range);
+      stack.push(range);
+    }
+
+    genLine++;
+    reader.pos = semi + 1;
+  } while (reader.pos < length);
+
+  return ranges;
+}
+
+export function encodeGeneratedRanges(ranges: GeneratedRange[]): string {
+  if (ranges.length === 0) return '';
+
+  const writer = new StringWriter();
+
+  for (let i = 0; i < ranges.length; ) {
+    i = _encodeGeneratedRanges(ranges, i, writer, [0, 0, 0, 0, 0, 0, 0]);
+  }
+
+  return writer.flush();
+}
+
+function _encodeGeneratedRanges(
+  ranges: GeneratedRange[],
+  index: number,
+  writer: StringWriter,
+  state: [
+    number, // GenLine
+    number, // GenColumn
+    number, // DefSourcesIndex
+    number, // DefScopesIndex
+    number, // CallSourcesIndex
+    number, // CallLine
+    number, // CallColumn
+  ],
+): number {
+  const range = ranges[index];
+  const {
+    0: startLine,
+    1: startColumn,
+    2: endLine,
+    3: endColumn,
+    isScope,
+    callsite,
+    bindings,
+  } = range;
+
+  if (state[0] < startLine) {
+    catchupLine(writer, state[0], startLine);
+    state[0] = startLine;
+    state[1] = 0;
+  } else if (index > 0) {
+    writer.write(comma);
+  }
+
+  state[1] = encodeInteger(writer, range[1], state[1]);
+
+  const fields =
+    (range.length === 6 ? 0b0001 : 0) | (callsite ? 0b0010 : 0) | (isScope ? 0b0100 : 0);
+  encodeInteger(writer, fields, 0);
+
+  if (range.length === 6) {
+    const { 4: sourcesIndex, 5: scopesIndex } = range;
+    if (sourcesIndex !== state[2]) {
+      state[3] = 0;
+    }
+    state[2] = encodeInteger(writer, sourcesIndex, state[2]);
+    state[3] = encodeInteger(writer, scopesIndex, state[3]);
+  }
+
+  if (callsite) {
+    const { 0: sourcesIndex, 1: callLine, 2: callColumn } = range.callsite!;
+    if (sourcesIndex !== state[4]) {
+      state[5] = 0;
+      state[6] = 0;
+    } else if (callLine !== state[5]) {
+      state[6] = 0;
+    }
+    state[4] = encodeInteger(writer, sourcesIndex, state[4]);
+    state[5] = encodeInteger(writer, callLine, state[5]);
+    state[6] = encodeInteger(writer, callColumn, state[6]);
+  }
+
+  if (bindings) {
+    for (const binding of bindings) {
+      if (binding.length > 1) encodeInteger(writer, -binding.length, 0);
+      const expression = binding[0][0];
+      encodeInteger(writer, expression, 0);
+      let bindingStartLine = startLine;
+      let bindingStartColumn = startColumn;
+      for (let i = 1; i < binding.length; i++) {
+        const expRange = binding[i];
+        bindingStartLine = encodeInteger(writer, expRange[1]!, bindingStartLine);
+        bindingStartColumn = encodeInteger(writer, expRange[2]!, bindingStartColumn);
+        encodeInteger(writer, expRange[0]!, 0);
+      }
+    }
+  }
+
+  for (index++; index < ranges.length; ) {
+    const next = ranges[index];
+    const { 0: l, 1: c } = next;
+    if (l > endLine || (l === endLine && c >= endColumn)) {
+      break;
+    }
+    index = _encodeGeneratedRanges(ranges, index, writer, state);
+  }
+
+  if (state[0] < endLine) {
+    catchupLine(writer, state[0], endLine);
+    state[0] = endLine;
+    state[1] = 0;
+  } else {
+    writer.write(comma);
+  }
+  state[1] = encodeInteger(writer, endColumn, state[1]);
+
+  return index;
+}
+
+function catchupLine(writer: StringWriter, lastLine: number, line: number) {
+  do {
+    writer.write(semicolon);
+  } while (++lastLine < line);
+}