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// Common functions for lexers
'use strict';
function isWhiteSpace(ch) {
return ch === 0x20;
}
// Check if line has zero length or contains spaces only
function isEmpty(state, line) {
return state.bMarks[line] + state.tShift[line] >= state.eMarks[line];
}
// Scan lines from given one and return first not empty
function skipEmptyLines(state, from) {
for (var max = state.lineMax; from < max; from++) {
if (state.bMarks[from] + state.tShift[from] < state.eMarks[from]) {
break;
}
}
return from;
}
// Skip spaces from given position.
function skipSpaces(state, pos) {
for (var max = state.src.length; pos < max; pos++) {
if (!isWhiteSpace(state.src.charCodeAt(pos))) { break; }
}
return pos;
}
// Skip char codes from given position
function skipChars(state, pos, code) {
for (var max = state.src.length; pos < max; pos++) {
if (state.src.charCodeAt(pos) !== code) { break; }
}
return pos;
}
// Skip char codes reverse from given position - 1
function skipCharsBack(state, pos, code, min) {
if (pos <= min) { return pos; }
while (pos > min) {
if (code !== state.src.charCodeAt(--pos)) { return pos + 1; }
}
return pos;
}
// cut lines range from source.
function getLines(state, begin, end, indent, keepLastLF) {
var i, first, last, queue,
line = begin;
if (begin >= end) {
return '';
}
// Opt: don't use push queue for single line;
if (line + 1 === end) {
first = state.bMarks[line] + Math.min(state.tShift[line], indent);
last = keepLastLF ? state.bMarks[end] : state.eMarks[end - 1];
return state.src.slice(first, last);
}
queue = new Array(end - begin);
for (i = 0; line < end; line++, i++) {
first = state.bMarks[line] + Math.min(state.tShift[line], indent);
if (line + 1 < end || keepLastLF) {
last = state.bMarks[line + 1];
} else {
last = state.eMarks[line];
}
queue[i] = state.src.slice(first, last);
}
return queue.join('');
}
exports.isWhiteSpace = isWhiteSpace;
exports.isEmpty = isEmpty;
exports.skipEmptyLines = skipEmptyLines;
exports.skipSpaces = skipSpaces;
exports.skipChars = skipChars;
exports.getLines = getLines;
exports.skipCharsBack = skipCharsBack;