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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, keepLastLF) {
var last;
if (keepLastLF) {
last = end < state.lineMax ? state.bMarks[end] : state.src.length;
} else {
last = end < state.lineMax ? state.eMarks[end - 1] : state.src.length;
}
return state.src.slice(state.bMarks[begin], last);
}
exports.isWhiteSpace = isWhiteSpace;
exports.isEmpty = isEmpty;
exports.skipEmptyLines = skipEmptyLines;
exports.skipSpaces = skipSpaces;
exports.skipChars = skipChars;
exports.getLines = getLines;
exports.skipCharsBack = skipCharsBack;