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// Copyright 2022 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
/** Parses CSV Database for easier lookups */
export class TokenDatabase {
private tokens: Map<number, string> = new Map();
constructor(readonly csv: string) {
this.parseTokensToTokensMap(csv.split(/\r?\n/));
}
has(token: number): boolean {
return this.tokens.has(token);
}
get(token: number): string | undefined {
return this.tokens.get(token);
}
private parseTokensToTokensMap(csv: string[]) {
for (const [lineNumber, line] of Object.entries(
csv.map(line => line.split(/,/))
)) {
if (!line[0] || !line[2]) {
continue;
}
if (!/^[a-fA-F0-9]+$/.test(line[0])) {
// Malformed number
console.error(
new Error(
`TokenDatabase number ${line[0]} at line ` +
`${lineNumber} is not a valid hex number`
)
);
continue;
}
const tokenNumber = parseInt(line[0], 16);
// To extract actual string value of a token number, we:
// - Slice token number and whitespace that are in [0] and [1] of line.
// - Join the rest as a string and trim the trailing quotes.
const data = line.slice(2).join(',').slice(1, -1);
this.tokens.set(tokenNumber, data);
}
}
}
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