@lillallol/outline-pdf-data-structure
Version:
Create a pdf outline data structure from a high level string representation of pdf outline. This data structure can be used to create a real pdf outline.
64 lines (63 loc) • 2.21 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports._errorMessage = exports.unindent = void 0;
const commonMaxIndentLength_1 = require("./commonMaxIndentLength");
/**
* @description
* It removes the first and last line of the provided string. From the remaining lines it
* calculates the common maximum indentation, ignoring empty lines, and then it subtracts it from
* each non empty line.
*
* The subtraction happens also for empty lines that have length bigger than the common minimum
* indentation length. If they have length less than the common minimum indentation length they are
* replaced with an empty string;
*
* - If `\s` characters are encountered in the indentation string that are not ` ` (space), it throws error.
* - If the first line is not an empty string, it throws error.
* - If the last line is not only space characters it throws error.
* @example
* unindent(
* `
* transaction tree string representation
*
* |_ "p"
* |_ "a"
* |_ "t"
* |_ "h"
* | |_ "prop1" -1 => 1
* |_ "t"
* |_ "prop" "11" => "1"
* `);
* //returns
* ` transaction tree string representation
*
* |_ "p"
* |_ "a"
* |_ "t"
* |_ "h"
* | |_ "prop1" -1 => 1
* |_ "t"
* |_ "prop" "11" => "1"`;
*/
function unindent(s) {
const lines = s.split("\n");
if (lines[0] !== "")
throw Error(exports._errorMessage.badFirstLine);
if (!/^[ ]*$/.test(lines[lines.length - 1]))
throw Error(exports._errorMessage.badLastLine);
const minIndentLength = commonMaxIndentLength_1.commonMaxIndentLength(s);
return s
.split("\n")
.slice(1, -1)
.map((line) => {
if (/^\s*$/.test(line) && line.length < minIndentLength)
return "";
return line.slice(minIndentLength, line.length);
})
.join("\n");
}
exports.unindent = unindent;
exports._errorMessage = {
badFirstLine: `first line has to be an empty string`,
badLastLine: "last line has to be only space characters",
};