template.js

src版Buffalo最新框架

                                    funcText.push('_OUT.write( (function() { ' + blockText + ' })() );');
                            }
                            begStmt = endStmtPrev = blockEnd + blockMarker.length - 1;
                        }
                    }                        
                } else if (body.charAt(begStmt - 1) != '$' &&               // Not an expression or backslashed,
                           body.charAt(begStmt - 1) != '\\') {              // so check if it is a statement tag.
                    var offset = (body.charAt(begStmt + 1) == '/' ? 2 : 1); // Close tags offset of 2 skips '/'.
                                                                            // 10 is larger than maximum statement tag length.
                    if (body.substring(begStmt + offset, begStmt + 10 + offset).search(TrimPath.parseTemplate_etc.statementTag) == 0) 
                        break;                                              // Found a match.
                }
                begStmt = body.indexOf("{", begStmt + 1);
            }
            if (begStmt < 0)                              // In "a{for}c", begStmt will be 1.
                break;
            var endStmt = body.indexOf("}", begStmt + 1); // In "a{for}c", endStmt will be 5.
            if (endStmt < 0)
                break;
            emitSectionText(body.substring(endStmtPrev + 1, begStmt), funcText);
            emitStatement(body.substring(begStmt, endStmt + 1), state, funcText, tmplName, etc);
            endStmtPrev = endStmt;
        }
        emitSectionText(body.substring(endStmtPrev + 1), funcText);
        if (state.stack.length != 0)
            throw new etc.ParseError(tmplName, state.line, "unclosed, unmatched statement(s): " + state.stack.join(","));
        funcText.push("}}; TrimPath_Template_TEMP");
        return funcText.join("");
    }
    
    var emitStatement = function(stmtStr, state, funcText, tmplName, etc) {
        var parts = stmtStr.slice(1, -1).split(' ');
        var stmt = etc.statementDef[parts[0]]; // Here, parts[0] == for/if/else/...
        if (stmt == null) {                    // Not a real statement.
            emitSectionText(stmtStr, funcText);
            return;
        }
        if (stmt.delta < 0) {
            if (state.stack.length <= 0)
                throw new etc.ParseError(tmplName, state.line, "close tag does not match any previous statement: " + stmtStr);
            state.stack.pop();
        } 
        if (stmt.delta > 0)
            state.stack.push(stmtStr);

        if (stmt.paramMin != null &&
            stmt.paramMin >= parts.length)
            throw new etc.ParseError(tmplName, state.line, "statement needs more parameters: " + stmtStr);
        if (stmt.prefixFunc != null)
            funcText.push(stmt.prefixFunc(parts, state, tmplName, etc));
        else 
            funcText.push(stmt.prefix);
        if (stmt.suffix != null) {
            if (parts.length <= 1) {
                if (stmt.paramDefault != null)
                    funcText.push(stmt.paramDefault);
            } else {
                for (var i = 1; i < parts.length; i++) {
                    if (i > 1)
                        funcText.push(' ');
                    funcText.push(parts[i]);
                }
            }
            funcText.push(stmt.suffix);
        }
    }

    var emitSectionText = function(text, funcText) {
        if (text.length <= 0)
            return;
        var nlPrefix = 0;               // Index to first non-newline in prefix.
        var nlSuffix = text.length - 1; // Index to first non-space/tab in suffix.
        while (nlPrefix < text.length && (text.charAt(nlPrefix) == '\n'))
            nlPrefix++;
        while (nlSuffix >= 0 && (text.charAt(nlSuffix) == ' ' || text.charAt(nlSuffix) == '\t'))
            nlSuffix--;
        if (nlSuffix < nlPrefix)
            nlSuffix = nlPrefix;
        if (nlPrefix > 0) {
            funcText.push('if (_FLAGS.keepWhitespace == true) _OUT.write("');
            var s = text.substring(0, nlPrefix).replace('\n', '\\n'); // A macro IE fix from BJessen.
            if (s.charAt(s.length - 1) == '\n')
            	s = s.substring(0, s.length - 1);
            funcText.push(s);
            funcText.push('");');
        }
        var lines = text.substring(nlPrefix, nlSuffix + 1).split('\n');
        for (var i = 0; i < lines.length; i++) {
            emitSectionTextLine(lines[i], funcText);
            if (i < lines.length - 1)
                funcText.push('_OUT.write("\\n");\n');
        }
        if (nlSuffix + 1 < text.length) {
            funcText.push('if (_FLAGS.keepWhitespace == true) _OUT.write("');
            var s = text.substring(nlSuffix + 1).replace('\n', '\\n');
            if (s.charAt(s.length - 1) == '\n')
            	s = s.substring(0, s.length - 1);
            funcText.push(s);
            funcText.push('");');
        }
    }
    
    var emitSectionTextLine = function(line, funcText) {
        var endMarkPrev = '}';
        var endExprPrev = -1;
        while (endExprPrev + endMarkPrev.length < line.length) {
            var begMark = "${", endMark = "}";
            var begExpr = line.indexOf(begMark, endExprPrev + endMarkPrev.length); // In "a${b}c", begExpr == 1
            if (begExpr < 0)
                break;
            if (line.charAt(begExpr + 2) == '%') {
                begMark = "${%";
                endMark = "%}";
            }
            var endExpr = line.indexOf(endMark, begExpr + begMark.length);         // In "a${b}c", endExpr == 4;
            if (endExpr < 0)
                break;
            emitText(line.substring(endExprPrev + endMarkPrev.length, begExpr), funcText);                
            // Example: exprs == 'firstName|default:"John Doe"|capitalize'.split('|')
            var exprArr = line.substring(begExpr + begMark.length, endExpr).replace(/\|\|/g, "#@@#").split('|');
            for (var k in exprArr) {
                if (exprArr[k].replace) // IE 5.x fix from Igor Poteryaev.
                    exprArr[k] = exprArr[k].replace(/#@@#/g, '||');
            }
            funcText.push('_OUT.write(');
            emitExpression(exprArr, exprArr.length - 1, funcText); 
            funcText.push(');');
            endExprPrev = endExpr;
            endMarkPrev = endMark;
        }
        emitText(line.substring(endExprPrev + endMarkPrev.length), funcText); 
    }
    
    var emitText = function(text, funcText) {
        if (text == null ||
            text.length <= 0)
            return;
        text = text.replace(/\\/g, '\\\\');
        text = text.replace(/\n/g, '\\n');
        text = text.replace(/"/g,  '\\"');
        funcText.push('_OUT.write("');
        funcText.push(text);
        funcText.push('");');
    }
    
    var emitExpression = function(exprArr, index, funcText) {
        // Ex: foo|a:x|b:y1,y2|c:z1,z2 is emitted as c(b(a(foo,x),y1,y2),z1,z2)
        var expr = exprArr[index]; // Ex: exprArr == [firstName,capitalize,default:"John Doe"]
        if (index <= 0) {          // Ex: expr    == 'default:"John Doe"'
            funcText.push(expr);
            return;
        }
        var parts = expr.split(':');
        funcText.push('_MODIFIERS["');
        funcText.push(parts[0]); // The parts[0] is a modifier function name, like capitalize.
        funcText.push('"](');
        emitExpression(exprArr, index - 1, funcText);
        if (parts.length > 1) {
            funcText.push(',');
            funcText.push(parts[1]);
        }
        funcText.push(')');
    }

    var cleanWhiteSpace = function(result) {
        result = result.replace(/\t/g,   "    ");
        result = result.replace(/\r\n/g, "\n");
        result = result.replace(/\r/g,   "\n");
        result = result.replace(/^(\s*\S*(\s+\S+)*)\s*$/, '$1'); // Right trim by Igor Poteryaev.
        return result;
    }

    var scrubWhiteSpace = function(result) {
        result = result.replace(/^\s+/g,   "");
        result = result.replace(/\s+$/g,   "");
        result = result.replace(/\s+/g,   " ");
        result = result.replace(/^(\s*\S*(\s+\S+)*)\s*$/, '$1'); // Right trim by Igor Poteryaev.
        return result;
    }

    // The DOM helper functions depend on DOM/DHTML, so they only work in a browser.
    // However, these are not considered core to the engine.
    //
    TrimPath.parseDOMTemplate = function(elementId, optDocument, optEtc) {
        if (optDocument == null)
            optDocument = document;
        var element = optDocument.getElementById(elementId);
        var content = element.value;     // Like textarea.value.
        if (content == null)
            content = element.innerHTML; // Like textarea.innerHTML.
        content = content.replace(/&lt;/g, "<").replace(/&gt;/g, ">");
        return TrimPath.parseTemplate(content, elementId, optEtc);
    }

    TrimPath.processDOMTemplate = function(elementId, context, optFlags, optDocument, optEtc) {
        return TrimPath.parseDOMTemplate(elementId, optDocument, optEtc).process(context, optFlags);
    }
}) ();