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Remove the remaining closures in the src/core/type1_parser.js file

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Given that the code is written with JavaScript module-syntax, none of this functionality will "leak" outside of this file with these change.
By removing this closure the file-size is decreased, even for the *built* `pdf.worker.js` file, since there's now less overall indentation in the code.
This commit is contained in:
Jonas Jenwald 2022-08-14 12:50:26 +02:00
parent e6fe127433
commit 6a2c2a646f
1 changed files with 663 additions and 678 deletions
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75
src/core/type1_parser.js
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@ -22,7 +22,25 @@ import { warn } from "../shared/util.js";
// in tracemonkey and various other pdfs with type1 fonts.
const HINTING_ENABLED = false;
/*
const COMMAND_MAP = {
hstem: [1],
vstem: [3],
vmoveto: [4],
rlineto: [5],
hlineto: [6],
vlineto: [7],
rrcurveto: [8],
callsubr: [10],
flex: [12, 35],
drop: [12, 18],
endchar: [14],
rmoveto: [21],
hmoveto: [22],
vhcurveto: [30],
hvcurveto: [31],
};
/**
* CharStrings are encoded following the the CharString Encoding sequence
* describe in Chapter 6 of the "Adobe Type1 Font Format" specification.
* The value in a byte indicates a command, a number, or subsequent bytes
@ -60,26 +78,6 @@ const HINTING_ENABLED = false;
* to be encoded and this encoding technique helps to minimize the length of
* the charStrings.
*/
const Type1CharString = (function Type1CharStringClosure() {
const COMMAND_MAP = {
hstem: [1],
vstem: [3],
vmoveto: [4],
rlineto: [5],
hlineto: [6],
vlineto: [7],
rrcurveto: [8],
callsubr: [10],
flex: [12, 35],
drop: [12, 18],
endchar: [14],
rmoveto: [21],
hmoveto: [22],
vhcurveto: [30],
hvcurveto: [31],
};
// eslint-disable-next-line no-shadow
class Type1CharString {
constructor() {
this.width = 0;
@ -155,11 +153,7 @@ const Type1CharString = (function Type1CharStringClosure() {
error = true;
break;
}
error = this.convert(
subrs[subrNumber],
subrs,
seacAnalysisEnabled
);
error = this.convert(subrs[subrNumber], subrs, seacAnalysisEnabled);
break;
case 11: // return
return error;
@ -361,22 +355,10 @@ const Type1CharString = (function Type1CharStringClosure() {
}
}
return Type1CharString;
})();
/*
* Type1Parser encapsulate the needed code for parsing a Type1 font
* program. Some of its logic depends on the Type2 charstrings
* structure.
* Note: this doesn't really parse the font since that would require evaluation
* of PostScript, but it is possible in most cases to extract what we need
* without a full parse.
*/
const Type1Parser = (function Type1ParserClosure() {
/*
/**
* Decrypt a Sequence of Ciphertext Bytes to Produce the Original Sequence
* of Plaintext Bytes. The function took a key as a parameter which can be
* for decrypting the eexec block of for decoding charStrings.
* of Plaintext Bytes. The function takes a key as a parameter which can be
* for decrypting the eexec block or for decoding charStrings.
*/
const EEXEC_ENCRYPT_KEY = 55665;
const CHAR_STRS_ENCRYPT_KEY = 4330;
@ -450,7 +432,13 @@ const Type1Parser = (function Type1ParserClosure() {
);
}
// eslint-disable-next-line no-shadow
/**
* Type1Parser encapsulate the needed code for parsing a Type1 font program.
* Some of its logic depends on the Type2 charstrings structure.
* NOTE: This doesn't really parse the font since that would require evaluation
* of PostScript, but it is possible in most cases to extract what we need
* without a full parse.
*/
class Type1Parser {
constructor(stream, encrypted, seacAnalysisEnabled) {
if (encrypted) {
@ -777,7 +765,4 @@ const Type1Parser = (function Type1ParserClosure() {
}
}
return Type1Parser;
})();
export { Type1Parser };