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* Some minor code cleanup

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* Some experimental stuff - likely to just drop soon, so no need for a branch
* Minor changes to ansi escape parser
This commit is contained in:
Bryan Ashby 2016-05-23 20:45:18 -06:00
parent 77a9306afa
commit 4f719259fe
5 changed files with 296 additions and 39 deletions
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111
core/string_util.js
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@ -11,6 +11,7 @@ exports.replaceAt = replaceAt;
exports.isPrintable = isPrintable;
exports.debugEscapedString = debugEscapedString;
exports.stringFromNullTermBuffer = stringFromNullTermBuffer;
exports.cleanControlCodes = cleanControlCodes;
// :TODO: create Unicode verison of this
var VOWELS = [ 'a', 'e', 'i', 'o', 'u' ];
@ -179,14 +180,6 @@ function debugEscapedString(s) {
}
function stringFromNullTermBuffer(buf, encoding) {
/*var nullPos = buf.length;
for(var i = 0; i < buf.length; ++i) {
if(0x00 === buf[i]) {
nullPos = i;
break;
}
}
*/
let nullPos = buf.indexOf(new Buffer( [ 0x00 ] ));
if(-1 === nullPos) {
nullPos = buf.length;
@ -231,4 +224,104 @@ var stringFormatExtensions = {
// :TODO: Add padding/etc. modifiers.
};
exports.stringFormatExtensions = stringFormatExtensions;
exports.stringFormatExtensions = stringFormatExtensions;
// :TODO: See notes in word_wrap.js about need to consolidate the various ANSI related RegExp's
//const REGEXP_ANSI_CONTROL_CODES = /(\x1b\x5b)([\?=;0-9]*?)([0-9A-ORZcf-npsu=><])/g;
const REGEXP_ANSI_CONTROL_CODES = /(?:\x1b\x5b)([\?=;0-9]*?)([A-ORZcf-npsu=><])/g;
const ANSI_OPCODES_ALLOWED_CLEAN = [
'C', 'm' ,
'A', 'B', 'D'
];
function cleanControlCodes(input) {
let m;
let pos;
let cleaned = '';
//
// Loop through |input| adding only allowed ESC
// sequences and literals to |cleaned|
//
do {
pos = REGEXP_ANSI_CONTROL_CODES.lastIndex;
m = REGEXP_ANSI_CONTROL_CODES.exec(input);
if(null !== m) {
if(m.index > pos) {
cleaned += input.slice(pos, m.index);
}
if(ANSI_OPCODES_ALLOWED_CLEAN.indexOf(m[2].charAt(0)) > -1) {
cleaned += m[0];
}
}
} while(0 !== REGEXP_ANSI_CONTROL_CODES.lastIndex);
// remainder
if(pos < input.length) {
cleaned += input.slice(pos);
}
return cleaned;
}
function getCleanAnsi(input) {
//
// Process |input| and produce |cleaned|, an array
// of lines with "clean" ANSI.
//
// Clean ANSI:
// * Contains only color/SGR sequences
// * All movement (up/down/left/right) removed but positioning
// left intact via spaces/etc.
//
// Temporary processing will occur in a grid. Each cell
// containing a character (defaulting to space) possibly a SGR
//
let m;
let pos;
let grid = [];
let gridPos = { row : 0, col : 0 };
function updateGrid(data, dataType) {
//
// Start at to grid[row][col] and populate val[0]...val[N]
// creating cells as necessary
//
if(!grid[gridPos.row]) {
grid[gridPos.row] = [];
}
if('literal' === dataType) {
data.forEach(c => {
grid[gridPos.row][gridPos.col] = (grid[gridPos.row][gridPos.col] || '') + c; // append to existing SGR
gridPos.col++;
});
} else if('sgr' === dataType) {
grid[gridPos.row][gridPos.col] = (grid[gridPos.row][gridPos.col] || '') + data;
}
}
function literal(s) {
let charCode;
const len = s.length;
for(let i = 0; i < len; ++i) {
charCode = s.charCodeAt(i) & 0xff;
}
}
do {
pos = REGEXP_ANSI_CONTROL_CODES.lastIndex;
m = REGEXP_ANSI_CONTROL_CODES.exec(input);
if(null !== m) {
if(m.index > pos) {
updateGrid(input.slice(pos, m.index), 'literal');
}
}
} while(0 !== REGEXP_ANSI_CONTROL_CODES.lastIndex);
}