Show More
Commit Description:
fig bugs in login report
Commit Description:
fig bugs in login report
References:
File last commit:
Show/Diff file:
Action:
node_modules/fontkit/src/aat/AATStateMachine.js
| 96 lines
| 2.6 KiB
| application/javascript
| JavascriptLexer
|
| r789 | import AATLookupTable from './AATLookupTable'; | |||
| const START_OF_TEXT_STATE = 0; | ||||
| const START_OF_LINE_STATE = 1; | ||||
| const END_OF_TEXT_CLASS = 0; | ||||
| const OUT_OF_BOUNDS_CLASS = 1; | ||||
| const DELETED_GLYPH_CLASS = 2; | ||||
| const END_OF_LINE_CLASS = 3; | ||||
| const DONT_ADVANCE = 0x4000; | ||||
| export default class AATStateMachine { | ||||
| constructor(stateTable) { | ||||
| this.stateTable = stateTable; | ||||
| this.lookupTable = new AATLookupTable(stateTable.classTable); | ||||
| } | ||||
| process(glyphs, reverse, processEntry) { | ||||
| let currentState = START_OF_TEXT_STATE; // START_OF_LINE_STATE is used for kashida glyph insertions sometimes I think? | ||||
| let index = reverse ? glyphs.length - 1 : 0; | ||||
| let dir = reverse ? -1 : 1; | ||||
| while ((dir === 1 && index <= glyphs.length) || (dir === -1 && index >= -1)) { | ||||
| let glyph = null; | ||||
| let classCode = OUT_OF_BOUNDS_CLASS; | ||||
| let shouldAdvance = true; | ||||
| if (index === glyphs.length || index === -1) { | ||||
| classCode = END_OF_TEXT_CLASS; | ||||
| } else { | ||||
| glyph = glyphs[index]; | ||||
| if (glyph.id === 0xffff) { // deleted glyph | ||||
| classCode = DELETED_GLYPH_CLASS; | ||||
| } else { | ||||
| classCode = this.lookupTable.lookup(glyph.id); | ||||
| if (classCode == null) { | ||||
| classCode = OUT_OF_BOUNDS_CLASS; | ||||
| } | ||||
| } | ||||
| } | ||||
| let row = this.stateTable.stateArray.getItem(currentState); | ||||
| let entryIndex = row[classCode]; | ||||
| let entry = this.stateTable.entryTable.getItem(entryIndex); | ||||
| if (classCode !== END_OF_TEXT_CLASS && classCode !== DELETED_GLYPH_CLASS) { | ||||
| processEntry(glyph, entry, index); | ||||
| shouldAdvance = !(entry.flags & DONT_ADVANCE); | ||||
| } | ||||
| currentState = entry.newState; | ||||
| if (shouldAdvance) { | ||||
| index += dir; | ||||
| } | ||||
| } | ||||
| return glyphs; | ||||
| } | ||||
| /** | ||||
| * Performs a depth-first traversal of the glyph strings | ||||
| * represented by the state machine. | ||||
| */ | ||||
| traverse(opts, state = 0, visited = new Set) { | ||||
| if (visited.has(state)) { | ||||
| return; | ||||
| } | ||||
| visited.add(state); | ||||
| let {nClasses, stateArray, entryTable} = this.stateTable; | ||||
| let row = stateArray.getItem(state); | ||||
| // Skip predefined classes | ||||
| for (let classCode = 4; classCode < nClasses; classCode++) { | ||||
| let entryIndex = row[classCode]; | ||||
| let entry = entryTable.getItem(entryIndex); | ||||
| // Try all glyphs in the class | ||||
| for (let glyph of this.lookupTable.glyphsForValue(classCode)) { | ||||
| if (opts.enter) { | ||||
| opts.enter(glyph, entry); | ||||
| } | ||||
| if (entry.newState !== 0) { | ||||
| this.traverse(opts, entry.newState, visited); | ||||
| } | ||||
| if (opts.exit) { | ||||
| opts.exit(glyph, entry); | ||||
| } | ||||
| } | ||||
| } | ||||
| } | ||||
| } | ||||