From 4a9c2acbf7a50a6205cc3f42f374a4b3047c9bf1 Mon Sep 17 00:00:00 2001
From: Martin von Gagern <Martin.vGagern@gmx.net>
Date: Mon, 25 Jul 2016 04:56:31 +0200
Subject: [PATCH] Add some more symbols (#502)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This adds support for the following input sequences:

    -- --- ` ' `` '' \degree \pounds \maltese

resulting in – — ‘ ’ “ ” ° £ ✠ symbols already present in our fonts.

As part of this modification, the recognition of multiple dashes was moved
from the lexer to the parser.
This is neccessary since in math mode a sequence of hyphens is just a
sequence of minus signs.  Just like a pair of apostrophes in math mode is a
double prime not a right double quotation mark.
To make this easier, parseGroup and parseOptionalGroup have been merged.
---
 src/Lexer.js                                  |   6 +-
 src/Parser.js                                 |  83 ++++++++++--------
 src/buildCommon.js                            |   8 +-
 src/symbols.js                                |  14 ++-
 .../images/DashesAndQuotes-chrome.png         | Bin 0 -> 8466 bytes
 .../images/DashesAndQuotes-firefox.png        | Bin 0 -> 8203 bytes
 test/screenshotter/images/Symbols1-chrome.png | Bin 0 -> 6420 bytes
 .../screenshotter/images/Symbols1-firefox.png | Bin 0 -> 5519 bytes
 test/screenshotter/ss_data.yaml               |   4 +
 test/screenshotter/test.tex                   |   2 +-
 10 files changed, 73 insertions(+), 44 deletions(-)
 create mode 100644 test/screenshotter/images/DashesAndQuotes-chrome.png
 create mode 100644 test/screenshotter/images/DashesAndQuotes-firefox.png
 create mode 100644 test/screenshotter/images/Symbols1-chrome.png
 create mode 100644 test/screenshotter/images/Symbols1-firefox.png

diff --git a/src/Lexer.js b/src/Lexer.js
index 648c705b9..5243bf280 100644
--- a/src/Lexer.js
+++ b/src/Lexer.js
@@ -63,7 +63,6 @@ Token.prototype.range = function(endToken, text) {
 
 /* The following tokenRegex
  * - matches typical whitespace (but not NBSP etc.) using its first group
- * - matches symbol combinations which result in a single output character
  * - does not match any control character \x00-\x1f except whitespace
  * - does not match a bare backslash
  * - matches any ASCII character except those just mentioned
@@ -78,9 +77,8 @@ Token.prototype.range = function(endToken, text) {
  * still reject the input.
  */
 var tokenRegex = new RegExp(
-    "([ \r\n\t]+)|(" +                                // whitespace
-    "---?" +                                          // special combinations
-    "|[!-\\[\\]-\u2027\u202A-\uD7FF\uF900-\uFFFF]" +  // single codepoint
+    "([ \r\n\t]+)|" +                                 // whitespace
+    "([!-\\[\\]-\u2027\u202A-\uD7FF\uF900-\uFFFF]" +  // single codepoint
     "|[\uD800-\uDBFF][\uDC00-\uDFFF]" +               // surrogate pair
     "|\\\\(?:[a-zA-Z]+|[^\uD800-\uDFFF])" +           // function name
     ")"
diff --git a/src/Parser.js b/src/Parser.js
index 64b1689b7..4bfde913b 100644
--- a/src/Parser.js
+++ b/src/Parser.js
@@ -545,7 +545,7 @@ Parser.prototype.parseArguments = function(func, funcData) {
             if (argType) {
                 arg = this.parseGroupOfType(argType, true);
             } else {
-                arg = this.parseOptionalGroup();
+                arg = this.parseGroup(true);
             }
             if (!arg) {
                 args.push(null);
@@ -623,12 +623,7 @@ Parser.prototype.parseGroupOfType = function(innerMode, optional) {
     }
     // By the time we get here, innerMode is one of "text" or "math".
     // We switch the mode of the parser, recurse, then restore the old mode.
-    var res;
-    if (optional) {
-        res = this.parseOptionalGroup();
-    } else {
-        res = this.parseGroup();
-    }
+    var res = this.parseGroup(optional);
     this.switchMode(outerMode);
     return res;
 };
@@ -638,7 +633,7 @@ Parser.prototype.parseGroupOfType = function(innerMode, optional) {
  * brace-enclosed tokens plus some position information.
  *
  * @param {string} modeName  Used to describe the mode in error messages
- * @param {boolean} optional  Whether the group is optional or required
+ * @param {boolean=} optional  Whether the group is optional or required
  */
 Parser.prototype.parseStringGroup = function(modeName, optional) {
     if (optional && this.nextToken.text !== "[") {
@@ -707,53 +702,71 @@ Parser.prototype.parseSizeGroup = function(optional) {
 };
 
 /**
- * Parses a group, which is either a single nucleus (like "x") or an expression
- * in braces (like "{x+y}")
+ * If the argument is false or absent, this parses an ordinary group,
+ * which is either a single nucleus (like "x") or an expression
+ * in braces (like "{x+y}").
+ * If the argument is true, it parses either a bracket-delimited expression
+ * (like "[x+y]") or returns null to indicate the absence of a
+ * bracket-enclosed group.
  *
+ * @param {boolean=} optional  Whether the group is optional or required
  * @return {?ParseFuncOrArgument}
  */
-Parser.prototype.parseGroup = function() {
+Parser.prototype.parseGroup = function(optional) {
     var firstToken = this.nextToken;
     // Try to parse an open brace
-    if (this.nextToken.text === "{") {
+    if (this.nextToken.text === (optional ? "[" : "{")) {
         // If we get a brace, parse an expression
         this.consume();
-        var expression = this.parseExpression(false);
+        var expression = this.parseExpression(false, optional ? "]" : null);
         var lastToken = this.nextToken;
         // Make sure we get a close brace
-        this.expect("}");
+        this.expect(optional ? "]" : "}");
+        if (this.mode === "text") {
+            this.formLigatures(expression);
+        }
         return new ParseFuncOrArgument(
             new ParseNode("ordgroup", expression, this.mode,
                           firstToken, lastToken),
             false);
     } else {
-        // Otherwise, just return a nucleus
-        return this.parseSymbol();
+        // Otherwise, just return a nucleus, or nothing for an optional group
+        return optional ? null : this.parseSymbol();
     }
 };
 
 /**
- * Parses a group, which is an expression in brackets (like "[x+y]")
+ * Form ligature-like combinations of characters for text mode.
+ * This includes inputs like "--", "---", "``" and "''".
+ * The result will simply replace multiple textord nodes with a single
+ * character in each value by a single textord node having multiple
+ * characters in its value.  The representation is still ASCII source.
  *
- * @return {?ParseFuncOrArgument}
+ * @param {Array.<ParseNode>} group  the nodes of this group,
+ *                                   list will be moified in place
  */
-Parser.prototype.parseOptionalGroup = function() {
-    var firstToken = this.nextToken;
-    // Try to parse an open bracket
-    if (this.nextToken.text === "[") {
-        // If we get a brace, parse an expression
-        this.consume();
-        var expression = this.parseExpression(false, "]");
-        var lastToken = this.nextToken;
-        // Make sure we get a close bracket
-        this.expect("]");
-        return new ParseFuncOrArgument(
-            new ParseNode("ordgroup", expression, this.mode,
-                          firstToken, lastToken),
-            false);
-    } else {
-        // Otherwise, return null,
-        return null;
+Parser.prototype.formLigatures = function(group) {
+    var i;
+    var n = group.length - 1;
+    for (i = 0; i < n; ++i) {
+        var a = group[i];
+        var v = a.value;
+        if (v === "-" && group[i + 1].value === "-") {
+            if (i + 1 < n && group[i + 2].value === "-") {
+                group.splice(i, 3, new ParseNode(
+                    "textord", "---", "text", a, group[i + 2]));
+                n -= 2;
+            } else {
+                group.splice(i, 2, new ParseNode(
+                    "textord", "--", "text", a, group[i + 1]));
+                n -= 1;
+            }
+        }
+        if ((v === "'" || v === "`") && group[i + 1].value === v) {
+            group.splice(i, 2, new ParseNode(
+                "textord", v + v, "text", a, group[i + 1]));
+            n -= 1;
+        }
     }
 };
 
diff --git a/src/buildCommon.js b/src/buildCommon.js
index b60e1860a..d793b5b38 100644
--- a/src/buildCommon.js
+++ b/src/buildCommon.js
@@ -23,9 +23,11 @@ var greekCapitals = [
     "\\Omega",
 ];
 
-var dotlessLetters = [
+// The following have to be loaded from Main-Italic font, using class mainit
+var mainitLetters = [
     "\u0131",   // dotless i, \imath
     "\u0237",   // dotless j, \jmath
+    "\u00a3",   // \pounds
 ];
 
 /**
@@ -101,7 +103,7 @@ var mathit = function(value, mode, color, classes) {
     if (/[0-9]/.test(value.charAt(0)) ||
             // glyphs for \imath and \jmath do not exist in Math-Italic so we
             // need to use Main-Italic instead
-            utils.contains(dotlessLetters, value) ||
+            utils.contains(mainitLetters, value) ||
             utils.contains(greekCapitals, value)) {
         return makeSymbol(
             value, "Main-Italic", mode, color, classes.concat(["mainit"]));
@@ -126,7 +128,7 @@ var makeOrd = function(group, options, type) {
 
     var font = options.font;
     if (font) {
-        if (font === "mathit" || utils.contains(dotlessLetters, value)) {
+        if (font === "mathit" || utils.contains(mainitLetters, value)) {
             return mathit(value, mode, color, classes);
         } else {
             var fontName = fontMap[font].fontName;
diff --git a/src/symbols.js b/src/symbols.js
index 6170cb5e7..aef7c8748 100644
--- a/src/symbols.js
+++ b/src/symbols.js
@@ -589,6 +589,18 @@ defineSymbol(math, main, accent, "\u02d9", "\\dot");
 defineSymbol(math, main, mathord, "\u0131", "\\imath");
 defineSymbol(math, main, mathord, "\u0237", "\\jmath");
 
+defineSymbol(text, main, textord, "\u2013", "--");
+defineSymbol(text, main, textord, "\u2014", "---");
+defineSymbol(text, main, textord, "\u2018", "`");
+defineSymbol(text, main, textord, "\u2019", "'");
+defineSymbol(text, main, textord, "\u201c", "``");
+defineSymbol(text, main, textord, "\u201d", "''");
+defineSymbol(math, main, textord, "\u00b0", "\\degree");
+defineSymbol(text, main, textord, "\u00b0", "\\degree");
+defineSymbol(math, main, mathord, "\u00a3", "\\pounds");
+defineSymbol(math, ams, textord, "\u2720", "\\maltese");
+defineSymbol(text, ams, textord, "\u2720", "\\maltese");
+
 defineSymbol(text, main, spacing, "\u00a0", "\\ ");
 defineSymbol(text, main, spacing, "\u00a0", " ");
 defineSymbol(text, main, spacing, "\u00a0", "~");
@@ -605,7 +617,7 @@ for (i = 0; i < mathTextSymbols.length; i++) {
 }
 
 // All of these are textords in text mode
-var textSymbols = "0123456789`!@*()-=+[]'\";:?/.,";
+var textSymbols = "0123456789!@*()-=+[]\";:?/.,";
 for (i = 0; i < textSymbols.length; i++) {
     ch = textSymbols.charAt(i);
     defineSymbol(text, main, textord, ch, ch);
diff --git a/test/screenshotter/images/DashesAndQuotes-chrome.png b/test/screenshotter/images/DashesAndQuotes-chrome.png
new file mode 100644
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diff --git a/test/screenshotter/ss_data.yaml b/test/screenshotter/ss_data.yaml
index a2ae511d7..4f2ce6d6c 100644
--- a/test/screenshotter/ss_data.yaml
+++ b/test/screenshotter/ss_data.yaml
@@ -36,6 +36,7 @@ Cases: |
 Colors:
     tex: \blue{a}\color{#0f0}{b}\color{red}{c}
     nolatex: different syntax and different scope
+DashesAndQuotes: \text{``a'' b---c -- d----`e'-{-}-f}--``x''
 DeepFontSizing:
     tex: |
         a^{\big| x^{\big(}}_{\Big\uparrow} +
@@ -109,6 +110,9 @@ SupSubHorizSpacing: |
 SupSubLeftAlignReset: |
     \omega^8_{888} \quad \frac{1}{\hat{\omega}^{8}_{888}} \quad \displaystyle\sum_{\omega^{8}_{888}}
 SupSubOffsets: \displaystyle \int_{2+3}x f^{2+3}+3\lim_{2+3+4+5}f
+Symbols1: |
+    \maltese\degree\pounds\$
+    \text{\maltese\degree}
 Text: \frac{a}{b}\text{c~ {ab} \ e}+fg
 UnsupportedCmds:
     tex: \err\,\frac\fracerr3\,2^\superr_\suberr\,\sqrt\sqrterr
diff --git a/test/screenshotter/test.tex b/test/screenshotter/test.tex
index 2945e8b8c..85c5d2032 100644
--- a/test/screenshotter/test.tex
+++ b/test/screenshotter/test.tex
@@ -1,6 +1,6 @@
 \documentclass[10pt]{article}
 
-\usepackage{amsmath,amssymb}
+\usepackage{amsmath,amssymb,textcomp,gensymb}
 \usepackage[mathscr]{eucal}
 \usepackage{eufrak}
 \usepackage[papersize={133pt,100pt},margin=0.5pt]{geometry}