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array_parser.ts
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array_parser.ts
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// Ported from https://github.com/bendrucker/postgres-array
// The MIT License (MIT)
//
// Copyright (c) Ben Drucker <bvdrucker@gmail.com> (bendrucker.me)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
/** Incorrectly parsed data types default to null */
type ArrayResult<T> = Array<T | null | ArrayResult<T>>;
type Transformer<T> = (value: string) => T;
function defaultValue(value: string): string {
return value;
}
export function parseArray(source: string): ArrayResult<string>;
export function parseArray<T>(
source: string,
transform: Transformer<T>,
): ArrayResult<T>;
export function parseArray(source: string, transform = defaultValue) {
return new ArrayParser(source, transform).parse();
}
class ArrayParser<T> {
position = 0;
entries: ArrayResult<T> = [];
recorded: string[] = [];
dimension = 0;
constructor(
public source: string,
public transform: Transformer<T>,
) {}
isEof(): boolean {
return this.position >= this.source.length;
}
nextCharacter() {
const character = this.source[this.position++];
if (character === "\\") {
return {
value: this.source[this.position++],
escaped: true,
};
}
return {
value: character,
escaped: false,
};
}
record(character: string): void {
this.recorded.push(character);
}
newEntry(includeEmpty = false): void {
let entry;
if (this.recorded.length > 0 || includeEmpty) {
entry = this.recorded.join("");
if (entry === "NULL" && !includeEmpty) {
entry = null;
}
if (entry !== null) entry = this.transform(entry);
this.entries.push(entry);
this.recorded = [];
}
}
consumeDimensions(): void {
if (this.source[0] === "[") {
while (!this.isEof()) {
const char = this.nextCharacter();
if (char.value === "=") break;
}
}
}
parse(nested = false): ArrayResult<T> {
let character, parser, quote;
this.consumeDimensions();
while (!this.isEof()) {
character = this.nextCharacter();
if (character.value === "{" && !quote) {
this.dimension++;
if (this.dimension > 1) {
parser = new ArrayParser(
this.source.substr(this.position - 1),
this.transform,
);
this.entries.push(parser.parse(true));
this.position += parser.position - 2;
}
} else if (character.value === "}" && !quote) {
this.dimension--;
if (!this.dimension) {
this.newEntry();
if (nested) return this.entries;
}
} else if (character.value === '"' && !character.escaped) {
if (quote) this.newEntry(true);
quote = !quote;
} else if (character.value === "," && !quote) {
this.newEntry();
} else {
this.record(character.value);
}
}
if (this.dimension !== 0) {
throw new Error("array dimension not balanced");
}
return this.entries;
}
}