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cleaning up the code

This commit is contained in:
Dmitry Shirokov 2013-08-07 12:54:22 +10:00
parent b60a93a538
commit 199a24bad6
1 changed files with 19 additions and 30 deletions
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47
encoding/iso2022.js
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@ -8,7 +8,7 @@ var util = require('util'),
* of encodings. * of encodings.
*/ */
function ISO_2022() {}; function ISO_2022() {}
ISO_2022.prototype.match = function(det) { ISO_2022.prototype.match = function(det) {
@ -37,39 +37,36 @@ ISO_2022.prototype.match = function(det) {
var textLen = det.fInputLen; var textLen = det.fInputLen;
scanInput: scanInput:
for (i=0; i<textLen; i++) { for (i = 0; i < textLen; i++) {
if (text[i] == 0x1b) { if (text[i] == 0x1b) {
checkEscapes: checkEscapes:
for (escN=0; escN < this.escapeSequences.length; escN++) { for (escN = 0; escN < this.escapeSequences.length; escN++) {
var seq = this.escapeSequences[escN]; var seq = this.escapeSequences[escN];
if ((textLen - i) < seq.length) { if ((textLen - i) < seq.length)
continue checkEscapes; continue checkEscapes;
}
for (j=1; j<seq.length; j++) { for (j = 1; j < seq.length; j++)
if (seq[j] != text[i+j]) { if (seq[j] != text[i + j])
continue checkEscapes; continue checkEscapes;
}
}
hits++; hits++;
i += seq.length-1; i += seq.length - 1;
continue scanInput; continue scanInput;
} }
misses++; misses++;
} }
if (text[i] == 0x0e || text[i] == 0x0f) {
// Shift in/out // Shift in/out
if (text[i] == 0x0e || text[i] == 0x0f)
shifts++; shifts++;
}
} }
if (hits == 0) { if (hits == 0)
return null; return null;
}
// //
// Initial quality is based on relative proportion of recongized vs. // Initial quality is based on relative proportion of recongized vs.
@ -77,27 +74,20 @@ ISO_2022.prototype.match = function(det) {
// All good: quality = 100; // All good: quality = 100;
// half or less good: quality = 0; // half or less good: quality = 0;
// linear inbetween. // linear inbetween.
quality = (100*hits - 100*misses) / (hits + misses); quality = (100 * hits - 100 * misses) / (hits + misses);
// Back off quality if there were too few escape sequences seen. // Back off quality if there were too few escape sequences seen.
// Include shifts in this computation, so that KR does not get penalized // Include shifts in this computation, so that KR does not get penalized
// for having only a single Escape sequence, but many shifts. // for having only a single Escape sequence, but many shifts.
if (hits+shifts < 5) { if (hits + shifts < 5)
quality -= (5-(hits+shifts))*10; quality -= (5 - (hits + shifts)) * 10;
}
if (quality < 0) { return quality <= 0 ? null : new Match(det, this, quality);
quality = 0;
}
// return quality;
return quality == 0 ? null : new Match(det, this, quality);
}; };
module.exports.ISO_2022_JP = function() { module.exports.ISO_2022_JP = function() {
this.name = function() { this.name = function() {
return "ISO-2022-JP"; return 'ISO-2022-JP';
}; };
this.escapeSequences = [ this.escapeSequences = [
[ 0x1b, 0x24, 0x28, 0x43 ], // KS X 1001:1992 [ 0x1b, 0x24, 0x28, 0x43 ], // KS X 1001:1992
@ -120,7 +110,7 @@ util.inherits(module.exports.ISO_2022_JP, ISO_2022);
module.exports.ISO_2022_KR = function() { module.exports.ISO_2022_KR = function() {
this.name = function() { this.name = function() {
return "ISO-2022-KR"; return 'ISO-2022-KR';
}; };
this.escapeSequences = [ this.escapeSequences = [
[ 0x1b, 0x24, 0x29, 0x43 ] [ 0x1b, 0x24, 0x29, 0x43 ]
@ -132,7 +122,7 @@ util.inherits(module.exports.ISO_2022_KR, ISO_2022);
module.exports.ISO_2022_CN = function() { module.exports.ISO_2022_CN = function() {
this.name = function() { this.name = function() {
return "ISO-2022-CN"; return 'ISO-2022-CN';
}; };
this.escapeSequences = [ this.escapeSequences = [
[ 0x1b, 0x24, 0x29, 0x41 ], // GB 2312-80 [ 0x1b, 0x24, 0x29, 0x41 ], // GB 2312-80
@ -149,4 +139,3 @@ module.exports.ISO_2022_CN = function() {
]; ];
}; };
util.inherits(module.exports.ISO_2022_CN, ISO_2022); util.inherits(module.exports.ISO_2022_CN, ISO_2022);