131 lines
3.4 KiB
JavaScript
131 lines
3.4 KiB
JavaScript
// Inline parser state
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'use strict';
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var Token = require('../token');
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var isWhiteSpace = require('../common/utils').isWhiteSpace;
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var isPunctChar = require('../common/utils').isPunctChar;
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var isMdAsciiPunct = require('../common/utils').isMdAsciiPunct;
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function StateInline(src, md, env, outTokens) {
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this.src = src;
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this.env = env;
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this.md = md;
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this.tokens = outTokens;
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this.pos = 0;
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this.posMax = this.src.length;
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this.level = 0;
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this.pending = '';
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this.pendingLevel = 0;
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this.cache = {}; // Stores { start: end } pairs. Useful for backtrack
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// optimization of pairs parse (emphasis, strikes).
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this.delimiters = []; // Emphasis-like delimiters
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}
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// Flush pending text
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//
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StateInline.prototype.pushPending = function () {
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var token = new Token('text', '', 0);
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token.content = this.pending;
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token.level = this.pendingLevel;
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this.tokens.push(token);
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this.pending = '';
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return token;
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};
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// Push new token to "stream".
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// If pending text exists - flush it as text token
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//
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StateInline.prototype.push = function (type, tag, nesting) {
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if (this.pending) {
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this.pushPending();
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}
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var token = new Token(type, tag, nesting);
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if (nesting < 0) this.level--; // closing tag
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token.level = this.level;
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if (nesting > 0) this.level++; // opening tag
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this.pendingLevel = this.level;
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this.tokens.push(token);
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return token;
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};
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// Scan a sequence of emphasis-like markers, and determine whether
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// it can start an emphasis sequence or end an emphasis sequence.
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//
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// - start - position to scan from (it should point at a valid marker);
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// - canSplitWord - determine if these markers can be found inside a word
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//
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StateInline.prototype.scanDelims = function (start, canSplitWord) {
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var pos = start, lastChar, nextChar, count, can_open, can_close,
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isLastWhiteSpace, isLastPunctChar,
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isNextWhiteSpace, isNextPunctChar,
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left_flanking = true,
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right_flanking = true,
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max = this.posMax,
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marker = this.src.charCodeAt(start);
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// treat beginning of the line as a whitespace
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lastChar = start > 0 ? this.src.charCodeAt(start - 1) : 0x20;
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while (pos < max && this.src.charCodeAt(pos) === marker) { pos++; }
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count = pos - start;
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// treat end of the line as a whitespace
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nextChar = pos < max ? this.src.charCodeAt(pos) : 0x20;
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isLastPunctChar = isMdAsciiPunct(lastChar) || isPunctChar(String.fromCharCode(lastChar));
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isNextPunctChar = isMdAsciiPunct(nextChar) || isPunctChar(String.fromCharCode(nextChar));
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isLastWhiteSpace = isWhiteSpace(lastChar);
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isNextWhiteSpace = isWhiteSpace(nextChar);
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if (isNextWhiteSpace) {
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left_flanking = false;
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} else if (isNextPunctChar) {
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if (!(isLastWhiteSpace || isLastPunctChar)) {
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left_flanking = false;
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}
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}
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if (isLastWhiteSpace) {
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right_flanking = false;
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} else if (isLastPunctChar) {
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if (!(isNextWhiteSpace || isNextPunctChar)) {
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right_flanking = false;
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}
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}
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if (!canSplitWord) {
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can_open = left_flanking && (!right_flanking || isLastPunctChar);
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can_close = right_flanking && (!left_flanking || isNextPunctChar);
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} else {
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can_open = left_flanking;
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can_close = right_flanking;
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}
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return {
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can_open: can_open,
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can_close: can_close,
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length: count
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};
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};
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// re-export Token class to use in block rules
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StateInline.prototype.Token = Token;
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module.exports = StateInline;
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