4d2e46e7f6
Summary: IE 9 doesn't like trailing commas. When we introduced eslint, we added a bunch of trailing commas, which makes IE 9 sad. Test Plan: - `make lint` - Visit http://localhost:7936/ using IE 9 on browserstack. - See that the math loads, and there are no errors in the F12 developer tools. @kevinb
279 lines
7.1 KiB
JavaScript
279 lines
7.1 KiB
JavaScript
/* eslint no-unused-vars:0 */
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var Style = require("./Style");
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var cjkRegex = require("./unicodeRegexes").cjkRegex;
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/**
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* This file contains metrics regarding fonts and individual symbols. The sigma
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* and xi variables, as well as the metricMap map contain data extracted from
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* TeX, TeX font metrics, and the TTF files. These data are then exposed via the
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* `metrics` variable and the getCharacterMetrics function.
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*/
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// In TeX, there are actually three sets of dimensions, one for each of
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// textstyle, scriptstyle, and scriptscriptstyle. These are provided in the
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// the arrays below, in that order.
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//
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// The font metrics are stored in fonts cmsy10, cmsy7, and cmsy5 respsectively.
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// This was determined by running the folllowing script:
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//
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// latex -interaction=nonstopmode \
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// '\documentclass{article}\usepackage{amsmath}\begin{document}' \
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// '$a$ \expandafter\show\the\textfont2' \
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// '\expandafter\show\the\scriptfont2' \
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// '\expandafter\show\the\scriptscriptfont2' \
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// '\stop'
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//
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// The metrics themselves were retreived using the following commands:
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//
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// tftopl cmsy10
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// tftopl cmsy7
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// tftopl cmsy5
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//
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// The output of each of these commands is quite lengthy. The only part we
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// care about is the FONTDIMEN section. Each value is measured in EMs.
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var sigmas = {
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slant: [0.250, 0.250, 0.250], // sigma1
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space: [0.000, 0.000, 0.000], // sigma2
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stretch: [0.000, 0.000, 0.000], // sigma3
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shrink: [0.000, 0.000, 0.000], // sigma4
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xHeight: [0.431, 0.431, 0.431], // sigma5
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quad: [1.000, 1.171, 1.472], // sigma6
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extraSpace: [0.000, 0.000, 0.000], // sigma7
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num1: [0.677, 0.732, 0.925], // sigma8
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num2: [0.394, 0.384, 0.387], // sigma9
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num3: [0.444, 0.471, 0.504], // sigma10
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denom1: [0.686, 0.752, 1.025], // sigma11
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denom2: [0.345, 0.344, 0.532], // sigma12
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sup1: [0.413, 0.503, 0.504], // sigma13
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sup2: [0.363, 0.431, 0.404], // sigma14
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sup3: [0.289, 0.286, 0.294], // sigma15
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sub1: [0.150, 0.143, 0.200], // sigma16
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sub2: [0.247, 0.286, 0.400], // sigma17
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supDrop: [0.386, 0.353, 0.494], // sigma18
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subDrop: [0.050, 0.071, 0.100], // sigma19
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delim1: [2.390, 1.700, 1.980], // sigma20
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delim2: [1.010, 1.157, 1.420], // sigma21
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axisHeight: [0.250, 0.250, 0.250] // sigma22
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};
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// These font metrics are extracted from TeX by using
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// \font\a=cmex10
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// \showthe\fontdimenX\a
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// where X is the corresponding variable number. These correspond to the font
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// parameters of the extension fonts (family 3). See the TeXbook, page 441.
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var xi1 = 0;
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var xi2 = 0;
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var xi3 = 0;
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var xi4 = 0;
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var xi5 = 0.431;
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var xi6 = 1;
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var xi7 = 0;
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var xi8 = 0.04;
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var xi9 = 0.111;
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var xi10 = 0.166;
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var xi11 = 0.2;
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var xi12 = 0.6;
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var xi13 = 0.1;
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// This value determines how large a pt is, for metrics which are defined in
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// terms of pts.
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// This value is also used in katex.less; if you change it make sure the values
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// match.
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var ptPerEm = 10.0;
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// The space between adjacent `|` columns in an array definition. From
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// `\showthe\doublerulesep` in LaTeX.
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var doubleRuleSep = 2.0 / ptPerEm;
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/**
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* This is just a mapping from common names to real metrics
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*/
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var metrics = {
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defaultRuleThickness: xi8,
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bigOpSpacing1: xi9,
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bigOpSpacing2: xi10,
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bigOpSpacing3: xi11,
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bigOpSpacing4: xi12,
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bigOpSpacing5: xi13,
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ptPerEm: ptPerEm,
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doubleRuleSep: doubleRuleSep
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};
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// This map contains a mapping from font name and character code to character
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// metrics, including height, depth, italic correction, and skew (kern from the
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// character to the corresponding \skewchar)
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// This map is generated via `make metrics`. It should not be changed manually.
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var metricMap = require("./fontMetricsData");
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// These are very rough approximations. We default to Times New Roman which
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// should have Latin-1 and Cyrillic characters, but may not depending on the
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// operating system. The metrics do not account for extra height from the
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// accents. In the case of Cyrillic characters which have both ascenders and
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// descenders we prefer approximations with ascenders, primarily to prevent
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// the fraction bar or root line from intersecting the glyph.
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// TODO(kevinb) allow union of multiple glyph metrics for better accuracy.
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var extraCharacterMap = {
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// Latin-1
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'À': 'A',
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'Á': 'A',
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'Â': 'A',
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'Ã': 'A',
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'Ä': 'A',
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'Å': 'A',
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'Æ': 'A',
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'Ç': 'C',
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'È': 'E',
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'É': 'E',
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'Ê': 'E',
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'Ë': 'E',
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'Ì': 'I',
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'Í': 'I',
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'Î': 'I',
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'Ï': 'I',
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'Ð': 'D',
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'Ñ': 'N',
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'Ò': 'O',
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'Ó': 'O',
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'Ô': 'O',
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'Õ': 'O',
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'Ö': 'O',
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'Ø': 'O',
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'Ù': 'U',
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'Ú': 'U',
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'Û': 'U',
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'Ü': 'U',
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'Ý': 'Y',
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'Þ': 'o',
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'ß': 'B',
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'à': 'a',
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'á': 'a',
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'â': 'a',
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'ã': 'a',
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'ä': 'a',
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'å': 'a',
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'æ': 'a',
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'ç': 'c',
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'è': 'e',
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'é': 'e',
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'ê': 'e',
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'ë': 'e',
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'ì': 'i',
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'í': 'i',
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'î': 'i',
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'ï': 'i',
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'ð': 'd',
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'ñ': 'n',
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'ò': 'o',
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'ó': 'o',
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'ô': 'o',
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'õ': 'o',
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'ö': 'o',
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'ø': 'o',
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'ù': 'u',
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'ú': 'u',
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'û': 'u',
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'ü': 'u',
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'ý': 'y',
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'þ': 'o',
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'ÿ': 'y',
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// Cyrillic
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'А': 'A',
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'Б': 'B',
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'В': 'B',
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'Г': 'F',
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'Д': 'A',
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'Е': 'E',
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'Ж': 'K',
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'З': '3',
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'И': 'N',
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'Й': 'N',
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'К': 'K',
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'Л': 'N',
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'М': 'M',
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'Н': 'H',
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'О': 'O',
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'П': 'N',
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'Р': 'P',
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'С': 'C',
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'Т': 'T',
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'У': 'y',
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'Ф': 'O',
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'Х': 'X',
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'Ц': 'U',
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'Ч': 'h',
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'Ш': 'W',
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'Щ': 'W',
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'Ъ': 'B',
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'Ы': 'X',
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'Ь': 'B',
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'Э': '3',
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'Ю': 'X',
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'Я': 'R',
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'а': 'a',
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'б': 'b',
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'в': 'a',
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'г': 'r',
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'д': 'y',
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'е': 'e',
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'ж': 'm',
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'з': 'e',
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'и': 'n',
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'й': 'n',
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'к': 'n',
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'л': 'n',
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'м': 'm',
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'н': 'n',
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'о': 'o',
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'п': 'n',
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'р': 'p',
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'с': 'c',
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'т': 'o',
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'у': 'y',
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'ф': 'b',
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'х': 'x',
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'ц': 'n',
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'ч': 'n',
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'ш': 'w',
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'щ': 'w',
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'ъ': 'a',
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'ы': 'm',
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'ь': 'a',
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'э': 'e',
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'ю': 'm',
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'я': 'r'
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};
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/**
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* This function is a convenience function for looking up information in the
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* metricMap table. It takes a character as a string, and a style.
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*
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* Note: the `width` property may be undefined if fontMetricsData.js wasn't
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* built using `Make extended_metrics`.
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*/
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var getCharacterMetrics = function(character, style) {
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var ch = character.charCodeAt(0);
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if (character[0] in extraCharacterMap) {
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ch = extraCharacterMap[character[0]].charCodeAt(0);
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} else if (cjkRegex.test(character[0])) {
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ch = 'M'.charCodeAt(0);
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}
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var metrics = metricMap[style][ch];
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if (metrics) {
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return {
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depth: metrics[0],
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height: metrics[1],
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italic: metrics[2],
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skew: metrics[3],
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width: metrics[4]
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};
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}
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};
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module.exports = {
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metrics: metrics,
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sigmas: sigmas,
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getCharacterMetrics: getCharacterMetrics
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};
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